Auto merge with /home/aegl/GIT/linus

137 files changed, 1771 insertions, 1700 deletions

diff --git a/arch/um/Kconfig.debug b/arch/um/Kconfig.debug
index b89989de364d..bd41e4286d0d 100644
--- a/arch/um/Kconfig.debug
+++ b/arch/um/Kconfig.debug
@@ -2,10 +2,6 @@ menu "Kernel hacking"
 
 source "lib/Kconfig.debug"
 
-config FRAME_POINTER
-        bool
-        default y if DEBUG_INFO
-
 config PT_PROXY
         bool "Enable ptrace proxy"
         depends on XTERM_CHAN && DEBUG_INFO && MODE_TT
diff --git a/arch/um/Kconfig_char b/arch/um/Kconfig_char
index 3e50fdb67626..62d87b71179b 100644
--- a/arch/um/Kconfig_char
+++ b/arch/um/Kconfig_char
@@ -204,5 +204,11 @@ config UML_RANDOM
         http://sourceforge.net/projects/gkernel/).  rngd periodically reads
         /dev/hwrng and injects the entropy into /dev/random.
 
+config MMAPPER
+        tristate "iomem emulation driver"
+        help
+        This driver allows a host file to be used as emulated IO memory inside
+        UML.
+
 endmenu
 
diff --git a/arch/um/Kconfig_x86_64 b/arch/um/Kconfig_x86_64
index fd8d7e8982b1..f162f50f0b17 100644
--- a/arch/um/Kconfig_x86_64
+++ b/arch/um/Kconfig_x86_64
@@ -6,6 +6,10 @@ config 64BIT
         bool
         default y
 
+config TOP_ADDR
+        hex
+        default 0x80000000
+
 config 3_LEVEL_PGTABLES
        bool
        default y
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 97bca6b5ca95..f2a0c40a9204 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -17,7 +17,7 @@ core-y			+= $(ARCH_DIR)/kernel/		\
 
 # Have to precede the include because the included Makefiles reference them.
 SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
-        arch-signal.h module.h vm-flags.h
+        module.h vm-flags.h elf.h
 SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
 
 # XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
@@ -44,6 +44,11 @@ ifneq ($(MAKEFILES-INCL),)
 endif
 
 ARCH_INCLUDE    := -I$(ARCH_DIR)/include
+ifneq ($(KBUILD_SRC),)
+ARCH_INCLUDE    += -I$(ARCH_DIR)/include2
+ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include
+MRPROPER_DIRS   += $(ARCH_DIR)/include2
+endif
 SYS_DIR         := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
 
 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
@@ -94,17 +99,18 @@ define archhelp
   echo '                   find in the kernel root.'
 endef
 
+ifneq ($(KBUILD_SRC),)
+$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig_$(SUBARCH) $(ARCH_DIR)/Kconfig_arch)
+CLEAN_FILES += $(ARCH_DIR)/Kconfig_arch
+else
 $(shell cd $(ARCH_DIR) && ln -sf Kconfig_$(SUBARCH) Kconfig_arch)
+endif
 
-prepare: $(ARCH_SYMLINKS) $(SYS_HEADERS) $(GEN_HEADERS) \
-        $(ARCH_DIR)/kernel/vmlinux.lds.S
+prepare: $(ARCH_SYMLINKS) $(SYS_HEADERS) $(GEN_HEADERS)
 
 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 
-LD_SCRIPT-$(CONFIG_LD_SCRIPT_STATIC) := uml.lds.S
-LD_SCRIPT-$(CONFIG_LD_SCRIPT_DYN) := dyn.lds.S
-
 CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
 CONFIG_KERNEL_STACK_ORDER ?= 2
 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
@@ -126,7 +132,7 @@ define cmd_vmlinux__
         $(CC) $(CFLAGS_vmlinux) -o $@ \
         -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
         -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
-        -L/usr/lib -lutil \
+        -lutil \
         $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
         FORCE ,$^) ; rm -f linux
 endef
@@ -145,31 +151,42 @@ archclean:
         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 
-#We need to re-preprocess this when the symlink dest changes.
-#So we touch it when needed.
-$(ARCH_DIR)/kernel/vmlinux.lds.S: FORCE
-        $(Q)if [ "$(shell readlink $@)" != "$(LD_SCRIPT-y)" ]; then \
-                echo '  SYMLINK $@'; \
-                ln -sf $(LD_SCRIPT-y) $@; \
-                touch $@; \
-        fi;
-
 $(SYMLINK_HEADERS):
         @echo '  SYMLINK $@'
+ifneq ($(KBUILD_SRC),)
+        ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
+else
         $(Q)cd $(TOPDIR)/$(dir $@) ; \
         ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
+endif
 
 include/asm-um/arch:
         @echo '  SYMLINK $@'
+ifneq ($(KBUILD_SRC),)
+        $(Q)mkdir -p include/asm-um
+        $(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
+else
         $(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
+endif
 
 $(ARCH_DIR)/include/sysdep:
         @echo '  SYMLINK $@'
+ifneq ($(KBUILD_SRC),)
+        $(Q)mkdir -p $(ARCH_DIR)/include
+        $(Q)mkdir -p $(ARCH_DIR)/include2
+        $(Q)ln -fsn sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
+        $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include2/sysdep
+else
         $(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
+endif
 
 $(ARCH_DIR)/os:
         @echo '  SYMLINK $@'
+ifneq ($(KBUILD_SRC),)
+        $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
+else
         $(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
+endif
 
 # Generated files
 define filechk_umlconfig
@@ -179,10 +196,31 @@ endef
 $(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
         $(call filechk,umlconfig)
 
+$(ARCH_DIR)/user-offsets.s: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.c
+        $(CC) $(USER_CFLAGS) -S -o $@ $<
+
+$(ARCH_DIR)/user-offsets.h: $(ARCH_DIR)/user-offsets.s
+        $(call filechk,gen-asm-offsets)
+
+CLEAN_FILES += $(ARCH_DIR)/user-offsets.s  $(ARCH_DIR)/user-offsets.h
+
+$(ARCH_DIR)/kernel-offsets.s: $(ARCH_DIR)/sys-$(SUBARCH)/kernel-offsets.c \
+                                   $(ARCH_SYMLINKS) \
+                                   $(SYS_DIR)/sc.h \
+                                   include/asm include/linux/version.h \
+                                   include/config/MARKER \
+                                   $(ARCH_DIR)/include/user_constants.h
+        $(CC) $(CFLAGS) $(NOSTDINC_FLAGS) $(CPPFLAGS) -S -o $@ $<
+
+$(ARCH_DIR)/kernel-offsets.h: $(ARCH_DIR)/kernel-offsets.s
+        $(call filechk,gen-asm-offsets)
+
+CLEAN_FILES += $(ARCH_DIR)/kernel-offsets.s  $(ARCH_DIR)/kernel-offsets.h
+
 $(ARCH_DIR)/include/task.h: $(ARCH_DIR)/util/mk_task
         $(call filechk,gen_header)
 
-$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/os/util/mk_user_constants
+$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/os-$(OS)/util/mk_user_constants
         $(call filechk,gen_header)
 
 $(ARCH_DIR)/include/kern_constants.h: $(ARCH_DIR)/util/mk_constants
@@ -191,20 +229,20 @@ $(ARCH_DIR)/include/kern_constants.h: $(ARCH_DIR)/util/mk_constants
 $(ARCH_DIR)/include/skas_ptregs.h: $(ARCH_DIR)/kernel/skas/util/mk_ptregs
         $(call filechk,gen_header)
 
-$(ARCH_DIR)/os/util/mk_user_constants: $(ARCH_DIR)/os/util FORCE ;
+$(ARCH_DIR)/os-$(OS)/util/mk_user_constants: $(ARCH_DIR)/os-$(OS)/util FORCE ;
 
 $(ARCH_DIR)/util/mk_task $(ARCH_DIR)/util/mk_constants: $(ARCH_DIR)/include/user_constants.h $(ARCH_DIR)/util \
         FORCE ;
 
 $(ARCH_DIR)/kernel/skas/util/mk_ptregs: $(ARCH_DIR)/kernel/skas/util FORCE ;
 
-$(ARCH_DIR)/util: scripts_basic $(SYS_DIR)/sc.h FORCE
+$(ARCH_DIR)/util: scripts_basic $(SYS_DIR)/sc.h $(ARCH_DIR)/kernel-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$@
 
-$(ARCH_DIR)/kernel/skas/util: scripts_basic FORCE
+$(ARCH_DIR)/kernel/skas/util: scripts_basic $(ARCH_DIR)/user-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$@
 
-$(ARCH_DIR)/os/util: scripts_basic FORCE
+$(ARCH_DIR)/os-$(OS)/util: scripts_basic FORCE
         $(Q)$(MAKE) $(build)=$@
 
 export SUBARCH USER_CFLAGS OS
diff --git a/arch/um/Makefile-i386 b/arch/um/Makefile-i386
index f9e3c0f06541..29e182d5a83a 100644
--- a/arch/um/Makefile-i386
+++ b/arch/um/Makefile-i386
@@ -32,10 +32,10 @@ $(SYS_DIR)/sc.h: $(SYS_UTIL_DIR)/mk_sc
 $(SYS_DIR)/thread.h: $(SYS_UTIL_DIR)/mk_thread 
         $(call filechk,gen_header)
 
-$(SYS_UTIL_DIR)/mk_sc: scripts_basic FORCE
+$(SYS_UTIL_DIR)/mk_sc: scripts_basic $(ARCH_DIR)/user-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$(SYS_UTIL_DIR) $@
 
-$(SYS_UTIL_DIR)/mk_thread: scripts_basic $(ARCH_SYMLINKS) $(GEN_HEADERS) FORCE
+$(SYS_UTIL_DIR)/mk_thread: scripts_basic $(ARCH_DIR)/kernel-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$(SYS_UTIL_DIR) $@
 
 $(SYS_UTIL_DIR): scripts_basic include/asm FORCE
diff --git a/arch/um/Makefile-x86_64 b/arch/um/Makefile-x86_64
index a77971133e91..32144562c279 100644
--- a/arch/um/Makefile-x86_64
+++ b/arch/um/Makefile-x86_64
@@ -23,10 +23,10 @@ $(SYS_DIR)/sc.h: $(SYS_UTIL_DIR)/mk_sc
 $(SYS_DIR)/thread.h: $(SYS_UTIL_DIR)/mk_thread
         $(call filechk,gen_header)
 
-$(SYS_UTIL_DIR)/mk_sc: scripts_basic FORCE
+$(SYS_UTIL_DIR)/mk_sc: scripts_basic $(ARCH_DIR)/user-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$(SYS_UTIL_DIR) $@
 
-$(SYS_UTIL_DIR)/mk_thread: scripts_basic $(ARCH_SYMLINKS) $(GEN_HEADERS) FORCE
+$(SYS_UTIL_DIR)/mk_thread: scripts_basic $(GEN_HEADERS) $(ARCH_DIR)/kernel-offsets.h FORCE
         $(Q)$(MAKE) $(build)=$(SYS_UTIL_DIR) $@
 
 CLEAN_FILES += $(SYS_HEADERS)
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index 323f72c64cd2..b2de9916c32c 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -22,8 +22,8 @@ obj-y := stdio_console.o fd.o chan_kern.o chan_user.o line.o
 obj-$(CONFIG_SSL) += ssl.o
 obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
 
-obj-$(CONFIG_UML_NET_SLIP) += slip.o
-obj-$(CONFIG_UML_NET_SLIRP) += slirp.o
+obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
+obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
 obj-$(CONFIG_UML_NET_DAEMON) += daemon.o 
 obj-$(CONFIG_UML_NET_MCAST) += mcast.o 
 #obj-$(CONFIG_UML_NET_PCAP) += pcap.o $(PCAP)
@@ -41,6 +41,6 @@ obj-$(CONFIG_UML_WATCHDOG) += harddog.o
 obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
 obj-$(CONFIG_UML_RANDOM) += random.o
 
-USER_OBJS := fd.o null.o pty.o tty.o xterm.o
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o
 
 include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 0150038af795..14a12d6b3df6 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -20,9 +20,17 @@
 #include "os.h"
 
 #ifdef CONFIG_NOCONFIG_CHAN
+
+/* The printk's here are wrong because we are complaining that there is no
+ * output device, but printk is printing to that output device.  The user will
+ * never see the error.  printf would be better, except it can't run on a
+ * kernel stack because it will overflow it.
+ * Use printk for now since that will avoid crashing.
+ */
+
 static void *not_configged_init(char *str, int device, struct chan_opts *opts)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(NULL);
 }
@@ -30,27 +38,27 @@ static void *not_configged_init(char *str, int device, struct chan_opts *opts)
 static int not_configged_open(int input, int output, int primary, void *data,
                               char **dev_out)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-ENODEV);
 }
 
 static void not_configged_close(int fd, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
 }
 
 static int not_configged_read(int fd, char *c_out, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
 
 static int not_configged_write(int fd, const char *buf, int len, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
@@ -58,7 +66,7 @@ static int not_configged_write(int fd, const char *buf, int len, void *data)
 static int not_configged_console_write(int fd, const char *buf, int len,
                                        void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
@@ -66,7 +74,7 @@ static int not_configged_console_write(int fd, const char *buf, int len,
 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
                                      unsigned short *cols)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-ENODEV);
 }
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 583b8e137c33..5d3768156c92 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -143,22 +143,22 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
 {
         struct winch_data data;
         unsigned long stack;
-        int fds[2], pid, n, err;
+        int fds[2], n, err;
         char c;
 
         err = os_pipe(fds, 1, 1);
         if(err < 0){
                 printk("winch_tramp : os_pipe failed, err = %d\n", -err);
-                return(err);
+                goto out;
         }
 
         data = ((struct winch_data) { .pty_fd           = fd,
                                       .pipe_fd          = fds[1],
                                       .close_me         = fds[0] } );
-        pid = run_helper_thread(winch_thread, &data, 0, &stack, 0);
-        if(pid < 0){
+        err = run_helper_thread(winch_thread, &data, 0, &stack, 0);
+        if(err < 0){
                 printk("fork of winch_thread failed - errno = %d\n", errno);
-                return(pid);
+                goto out_close;
         }
 
         os_close_file(fds[1]);
@@ -168,14 +168,22 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
                 printk("winch_tramp : failed to read synchronization byte\n");
                 printk("read failed, err = %d\n", -n);
                 printk("fd %d will not support SIGWINCH\n", fd);
-                *fd_out = -1;
+                err = -EINVAL;
+                goto out_close1;
         }
-        return(pid);
+        return err ;
+
+ out_close:
+        os_close_file(fds[1]);
+ out_close1:
+        os_close_file(fds[0]);
+ out:
+        return err;
 }
 
 void register_winch(int fd, struct tty_struct *tty)
 {
-        int pid, thread, thread_fd;
+        int pid, thread, thread_fd = -1;
         int count;
         char c = 1;
 
@@ -186,7 +194,7 @@ void register_winch(int fd, struct tty_struct *tty)
         if(!CHOOSE_MODE_PROC(is_tracer_winch, is_skas_winch, pid, fd,
                              tty) && (pid == -1)){
                 thread = winch_tramp(fd, tty, &thread_fd);
-                if(fd != -1){
+                if(thread > 0){
                         register_winch_irq(thread_fd, fd, thread, tty);
 
                         count = os_write_file(thread_fd, &c, sizeof(c));
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index d0f97127adf6..025d3be8aca4 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -462,12 +462,15 @@ out:
         return err;
 }
 
+static void unregister_winch(struct tty_struct *tty);
+
 void line_close(struct tty_struct *tty, struct file * filp)
 {
         struct line *line = tty->driver_data;
 
-        /* XXX: I assume this should be called in process context, not with interrupt
-         * disabled!*/
+        /* XXX: I assume this should be called in process context, not with
+         *  interrupts disabled!
+         */
         spin_lock_irq(&line->lock);
 
         /* We ignore the error anyway! */
@@ -478,6 +481,12 @@ void line_close(struct tty_struct *tty, struct file * filp)
                 line_disable(tty, -1);
                 tty->driver_data = NULL;
         }
+
+        if((line->count == 0) && line->sigio){
+                unregister_winch(tty);
+                line->sigio = 0;
+        }
+
         spin_unlock_irq(&line->lock);
 }
 
@@ -729,6 +738,34 @@ void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
         up(&winch_handler_sem);
 }
 
+static void unregister_winch(struct tty_struct *tty)
+{
+        struct list_head *ele;
+        struct winch *winch, *found = NULL;
+
+        down(&winch_handler_sem);
+        list_for_each(ele, &winch_handlers){
+                winch = list_entry(ele, struct winch, list);
+                if(winch->tty == tty){
+                        found = winch;
+                        break;
+                }
+        }
+
+        if(found == NULL)
+                goto out;
+
+        if(winch->pid != -1)
+                os_kill_process(winch->pid, 1);
+
+        free_irq_by_irq_and_dev(WINCH_IRQ, winch);
+        free_irq(WINCH_IRQ, winch);
+        list_del(&winch->list);
+        kfree(winch);
+ out:
+        up(&winch_handler_sem);
+}
+
 static void winch_cleanup(void)
 {
         struct list_head *ele;
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
index faf714e87b5b..217438cdef33 100644
--- a/arch/um/drivers/mcast_kern.c
+++ b/arch/um/drivers/mcast_kern.c
@@ -73,7 +73,6 @@ int mcast_setup(char *str, char **mac_out, void *data)
         struct mcast_init *init = data;
         char *port_str = NULL, *ttl_str = NULL, *remain;
         char *last;
-        int n;
 
         *init = ((struct mcast_init)
                 { .addr         = "239.192.168.1",
@@ -89,13 +88,12 @@ int mcast_setup(char *str, char **mac_out, void *data)
         }
         
         if(port_str != NULL){
-                n = simple_strtoul(port_str, &last, 10);
+                init->port = simple_strtoul(port_str, &last, 10);
                 if((*last != '\0') || (last == port_str)){
                         printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", 
                                port_str);
                         return(0);
                 }
-                init->port = htons(n);
         }
 
         if(ttl_str != NULL){
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
index 0fe1d9fa9139..7a0d115b29d0 100644
--- a/arch/um/drivers/mcast_user.c
+++ b/arch/um/drivers/mcast_user.c
@@ -38,7 +38,7 @@ static struct sockaddr_in *new_addr(char *addr, unsigned short port)
         }
         sin->sin_family = AF_INET;
         sin->sin_addr.s_addr = in_aton(addr);
-        sin->sin_port = port;
+        sin->sin_port = htons(port);
         return(sin);
 }
 
@@ -55,28 +55,25 @@ static int mcast_open(void *data)
         struct mcast_data *pri = data;
         struct sockaddr_in *sin = pri->mcast_addr;
         struct ip_mreq mreq;
-        int fd, yes = 1;
+        int fd = -EINVAL, yes = 1, err = -EINVAL;;
 
 
-        if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0)) {
-                fd = -EINVAL;
+        if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
                 goto out;
-        }
 
         fd = socket(AF_INET, SOCK_DGRAM, 0);
+
         if (fd < 0){
                 printk("mcast_open : data socket failed, errno = %d\n", 
                        errno);
-                fd = -ENOMEM;
+                fd = -errno;
                 goto out;
         }
 
         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
                 printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* set ttl according to config */
@@ -84,26 +81,20 @@ static int mcast_open(void *data)
                        sizeof(pri->ttl)) < 0) {
                 printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* set LOOP, so data does get fed back to local sockets */
         if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
                 printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* bind socket to mcast address */
         if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
                 printk("mcast_open : data bind failed, errno = %d\n", errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }               
         
         /* subscribe to the multicast group */
@@ -117,12 +108,15 @@ static int mcast_open(void *data)
                        "interface on the host.\n");
                 printk("eth0 should be configured in order to use the "
                        "multicast transport.\n");
-                os_close_file(fd);
-                fd = -EINVAL;
+                goto out_close;
         }
 
  out:
-        return(fd);
+        return fd;
+
+ out_close:
+        os_close_file(fd);
+        return err;
 }
 
 static void mcast_close(int fd, void *data)
@@ -164,14 +158,3 @@ struct net_user_info mcast_user_info = {
         .delete_address = NULL,
         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 };
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index a63231dffe05..a37a5ac13c22 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/init.h> 
 #include <linux/smp_lock.h>
+#include <linux/miscdevice.h>
 #include <asm/uaccess.h>
 #include <asm/irq.h>
 #include <asm/pgtable.h>
@@ -117,24 +118,39 @@ static struct file_operations mmapper_fops = {
         .release        = mmapper_release,
 };
 
+static struct miscdevice mmapper_dev = {
+        .minor          = MISC_DYNAMIC_MINOR,
+        .name           = "mmapper",
+        .fops           = &mmapper_fops
+};
+
 static int __init mmapper_init(void)
 {
+        int err;
+
         printk(KERN_INFO "Mapper v0.1\n");
 
         v_buf = (char *) find_iomem("mmapper", &mmapper_size);
         if(mmapper_size == 0){
                 printk(KERN_ERR "mmapper_init - find_iomem failed\n");
-                return(0);
+                goto out;
         }
 
-        p_buf = __pa(v_buf);
+        err = misc_register(&mmapper_dev);
+        if(err){
+                printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
+                       err);
+                goto out;
+        }
 
-        devfs_mk_cdev(MKDEV(30, 0), S_IFCHR|S_IRUGO|S_IWUGO, "mmapper");
-        return(0);
+        p_buf = __pa(v_buf);
+out:
+        return 0;
 }
 
 static void mmapper_exit(void)
 {
+        misc_deregister(&mmapper_dev);
 }
 
 module_init(mmapper_init);
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index 47229fe4a813..3730d4f12713 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -32,7 +32,7 @@ int tap_open_common(void *dev, char *gate_addr)
         return(0);
 }
 
-void tap_check_ips(char *gate_addr, char *eth_addr)
+void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
 {
         int tap_addr[4];
 
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index d43e9fab05a7..f9e22198e011 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -1,5 +1,10 @@
-/* Much of this ripped from hw_random.c */
-
+/* Copyright (C) 2005 Jeff Dike <jdike@addtoit.com> */
+/* Much of this ripped from drivers/char/hw_random.c, see there for other
+ * copyright.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
@@ -12,8 +17,6 @@
  */
 #define RNG_VERSION "1.0.0"
 #define RNG_MODULE_NAME "random"
-#define RNG_DRIVER_NAME   RNG_MODULE_NAME " virtual driver " RNG_VERSION
-#define PFX RNG_MODULE_NAME ": "
 
 #define RNG_MISCDEV_MINOR               183 /* official */
 
@@ -98,7 +101,7 @@ static int __init rng_init (void)
 
         err = misc_register (&rng_miscdev);
         if (err) {
-                printk (KERN_ERR PFX "misc device register failed\n");
+                printk (KERN_ERR RNG_MODULE_NAME ": misc device register failed\n");
                 goto err_out_cleanup_hw;
         }
 
@@ -120,3 +123,6 @@ static void __exit rng_cleanup (void)
 
 module_init (rng_init);
 module_exit (rng_cleanup);
+
+MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/slip.h b/arch/um/drivers/slip.h
index 495f2f1b1420..bb0dab41c2e4 100644
--- a/arch/um/drivers/slip.h
+++ b/arch/um/drivers/slip.h
@@ -1,10 +1,7 @@
 #ifndef __UM_SLIP_H
 #define __UM_SLIP_H
 
-#define BUF_SIZE 1500
- /* two bytes each for a (pathological) max packet of escaped chars +  * 
-  * terminating END char + initial END char                            */
-#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+#include "slip_common.h"
 
 struct slip_data {
         void *dev;
@@ -12,28 +9,12 @@ struct slip_data {
         char *addr;
         char *gate_addr;
         int slave;
-        char ibuf[ENC_BUF_SIZE];
-        char obuf[ENC_BUF_SIZE];
-        int more; /* more data: do not read fd until ibuf has been drained */
-        int pos;
-        int esc;
+        struct slip_proto slip;
 };
 
 extern struct net_user_info slip_user_info;
 
-extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
 extern int slip_user_read(int fd, void *buf, int len, struct slip_data *pri);
 extern int slip_user_write(int fd, void *buf, int len, struct slip_data *pri);
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/drivers/slip_common.c b/arch/um/drivers/slip_common.c
new file mode 100644
index 000000000000..e89cfc68fc3e
--- /dev/null
+++ b/arch/um/drivers/slip_common.c
@@ -0,0 +1,54 @@
+#include <string.h>
+#include "slip_common.h"
+#include "net_user.h"
+
+int slip_proto_read(int fd, void *buf, int len, struct slip_proto *slip)
+{
+        int i, n, size, start;
+
+        if(slip->more > 0){
+                i = 0;
+                while(i < slip->more){
+                        size = slip_unesc(slip->ibuf[i++], slip->ibuf,
+                                          &slip->pos, &slip->esc);
+                        if(size){
+                                memcpy(buf, slip->ibuf, size);
+                                memmove(slip->ibuf, &slip->ibuf[i],
+                                        slip->more - i);
+                                slip->more = slip->more - i;
+                                return size;
+                        }
+                }
+                slip->more = 0;
+        }
+
+        n = net_read(fd, &slip->ibuf[slip->pos],
+                     sizeof(slip->ibuf) - slip->pos);
+        if(n <= 0)
+                return n;
+
+        start = slip->pos;
+        for(i = 0; i < n; i++){
+                size = slip_unesc(slip->ibuf[start + i], slip->ibuf,&slip->pos,
+                                  &slip->esc);
+                if(size){
+                        memcpy(buf, slip->ibuf, size);
+                        memmove(slip->ibuf, &slip->ibuf[start+i+1],
+                                n - (i + 1));
+                        slip->more = n - (i + 1);
+                        return size;
+                }
+        }
+        return 0;
+}
+
+int slip_proto_write(int fd, void *buf, int len, struct slip_proto *slip)
+{
+        int actual, n;
+
+        actual = slip_esc(buf, slip->obuf, len);
+        n = net_write(fd, slip->obuf, actual);
+        if(n < 0)
+                return n;
+        else return len;
+}
diff --git a/arch/um/drivers/slip_proto.h b/arch/um/drivers/slip_common.h
index 7206361ace45..2ae76d8f1be1 100644
--- a/arch/um/drivers/slip_proto.h
+++ b/arch/um/drivers/slip_common.h
@@ -1,10 +1,10 @@
-/* 
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
+#ifndef __UM_SLIP_COMMON_H
+#define __UM_SLIP_COMMON_H
 
-#ifndef __UM_SLIP_PROTO_H__
-#define __UM_SLIP_PROTO_H__
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars +  *
+  * terminating END char + initial END char                            */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
 
 /* SLIP protocol characters. */
 #define SLIP_END             0300       /* indicates end of frame       */
@@ -12,7 +12,8 @@
 #define SLIP_ESC_END         0334       /* ESC ESC_END means END 'data' */
 #define SLIP_ESC_ESC         0335       /* ESC ESC_ESC means ESC 'data' */
 
-static inline int slip_unesc(unsigned char c,char *buf,int *pos, int *esc)
+static inline int slip_unesc(unsigned char c, unsigned char *buf, int *pos,
+                             int *esc)
 {
         int ret;
 
@@ -79,15 +80,25 @@ static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
         return (ptr - d);
 }
 
-#endif
+struct slip_proto {
+        unsigned char ibuf[ENC_BUF_SIZE];
+        unsigned char obuf[ENC_BUF_SIZE];
+        int more; /* more data: do not read fd until ibuf has been drained */
+        int pos;
+        int esc;
+};
+
+#define SLIP_PROTO_INIT { \
+        .ibuf   = { '\0' }, \
+        .obuf   = { '\0' }, \
+        .more   = 0, \
+        .pos    = 0, \
+        .esc    = 0 \
+}
 
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+extern int slip_proto_read(int fd, void *buf, int len,
+                           struct slip_proto *slip);
+extern int slip_proto_write(int fd, void *buf, int len,
+                            struct slip_proto *slip);
+
+#endif
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
index 0886eedba213..9a6f5c85f902 100644
--- a/arch/um/drivers/slip_kern.c
+++ b/arch/um/drivers/slip_kern.c
@@ -26,16 +26,16 @@ void slip_init(struct net_device *dev, void *data)
                   .addr         = NULL,
                   .gate_addr    = init->gate_addr,
                   .slave        = -1,
-                  .ibuf         = { '\0' },
-                  .obuf         = { '\0' },
-                  .pos          = 0,
-                  .esc          = 0,
+                  .slip         = SLIP_PROTO_INIT,
                   .dev          = dev });
 
         dev->init = NULL;
+        dev->header_cache_update = NULL;
+        dev->hard_header_cache = NULL;
+        dev->hard_header = NULL;
         dev->hard_header_len = 0;
-        dev->addr_len = 4;
-        dev->type = ARPHRD_ETHER;
+        dev->addr_len = 0;
+        dev->type = ARPHRD_SLIP;
         dev->tx_queue_len = 256;
         dev->flags = IFF_NOARP;
         printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
index d94846b1b4cf..71af444e591f 100644
--- a/arch/um/drivers/slip_user.c
+++ b/arch/um/drivers/slip_user.c
@@ -13,7 +13,7 @@
 #include "user.h"
 #include "net_user.h"
 #include "slip.h"
-#include "slip_proto.h"
+#include "slip_common.h"
 #include "helper.h"
 #include "os.h"
 
@@ -77,41 +77,51 @@ static int slip_tramp(char **argv, int fd)
         err = os_pipe(fds, 1, 0);
         if(err < 0){
                 printk("slip_tramp : pipe failed, err = %d\n", -err);
-                return(err);
+                goto out;
         }
 
         err = 0;
         pe_data.stdin = fd;
         pe_data.stdout = fds[1];
         pe_data.close_me = fds[0];
-        pid = run_helper(slip_pre_exec, &pe_data, argv, NULL);
+        err = run_helper(slip_pre_exec, &pe_data, argv, NULL);
+        if(err < 0)
+                goto out_close;
+        pid = err;
+
+        output_len = page_size();
+        output = um_kmalloc(output_len);
+        if(output == NULL){
+                printk("slip_tramp : failed to allocate output buffer\n");
+                os_kill_process(pid, 1);
+                err = -ENOMEM;
+                goto out_free;
+        }
 
-        if(pid < 0) err = pid;
-        else {
-                output_len = page_size();
-                output = um_kmalloc(output_len);
-                if(output == NULL)
-                        printk("slip_tramp : failed to allocate output "
-                               "buffer\n");
-
-                os_close_file(fds[1]);
-                read_output(fds[0], output, output_len);
-                if(output != NULL){
-                        printk("%s", output);
-                        kfree(output);
-                }
-                CATCH_EINTR(err = waitpid(pid, &status, 0));
-                if(err < 0)
-                        err = errno;
-                else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
-                        printk("'%s' didn't exit with status 0\n", argv[0]);
-                        err = -EINVAL;
-                }
+        os_close_file(fds[1]);
+        read_output(fds[0], output, output_len);
+        printk("%s", output);
+
+        CATCH_EINTR(err = waitpid(pid, &status, 0));
+        if(err < 0)
+                err = errno;
+        else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
+                printk("'%s' didn't exit with status 0\n", argv[0]);
+                err = -EINVAL;
         }
+        else err = 0;
 
         os_close_file(fds[0]);
 
-        return(err);
+out_free:
+        kfree(output);
+        return err;
+
+out_close:
+        os_close_file(fds[0]);
+        os_close_file(fds[1]);
+out:
+        return err;
 }
 
 static int slip_open(void *data)
@@ -123,21 +133,26 @@ static int slip_open(void *data)
                          NULL };
         int sfd, mfd, err;
 
-        mfd = get_pty();
-        if(mfd < 0){
-                printk("umn : Failed to open pty, err = %d\n", -mfd);
-                return(mfd);
+        err = get_pty();
+        if(err < 0){
+                printk("slip-open : Failed to open pty, err = %d\n", -err);
+                goto out;
         }
-        sfd = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
-        if(sfd < 0){
-                printk("Couldn't open tty for slip line, err = %d\n", -sfd);
-                os_close_file(mfd);
-                return(sfd);
+        mfd = err;
+
+        err = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
+        if(err < 0){
+                printk("Couldn't open tty for slip line, err = %d\n", -err);
+                goto out_close;
         }
-        if(set_up_tty(sfd)) return(-1);
+        sfd = err;
+
+        if(set_up_tty(sfd))
+                goto out_close2;
+
         pri->slave = sfd;
-        pri->pos = 0;
-        pri->esc = 0;
+        pri->slip.pos = 0;
+        pri->slip.esc = 0;
         if(pri->gate_addr != NULL){
                 sprintf(version_buf, "%d", UML_NET_VERSION);
                 strcpy(gate_buf, pri->gate_addr);
@@ -146,12 +161,12 @@ static int slip_open(void *data)
 
                 if(err < 0){
                         printk("slip_tramp failed - err = %d\n", -err);
-                        return(err);
+                        goto out_close2;
                 }
                 err = os_get_ifname(pri->slave, pri->name);
                 if(err < 0){
                         printk("get_ifname failed, err = %d\n", -err);
-                        return(err);
+                        goto out_close2;
                 }
                 iter_addresses(pri->dev, open_addr, pri->name);
         }
@@ -160,10 +175,16 @@ static int slip_open(void *data)
                 if(err < 0){
                         printk("Failed to set slip discipline encapsulation - "
                                "err = %d\n", -err);
-                        return(err);
+                        goto out_close2;
                 }
         }
         return(mfd);
+out_close2:
+        os_close_file(sfd);
+out_close:
+        os_close_file(mfd);
+out:
+        return err;
 }
 
 static void slip_close(int fd, void *data)
@@ -190,48 +211,12 @@ static void slip_close(int fd, void *data)
 
 int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
 {
-        int i, n, size, start;
-
-        if(pri->more>0) {
-                i = 0;
-                while(i < pri->more) {
-                        size = slip_unesc(pri->ibuf[i++],
-                                        pri->ibuf, &pri->pos, &pri->esc);
-                        if(size){
-                                memcpy(buf, pri->ibuf, size);
-                                memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
-                                pri->more=pri->more-i; 
-                                return(size);
-                        }
-                }
-                pri->more=0;
-        }
-
-        n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
-        if(n <= 0) return(n);
-
-        start = pri->pos;
-        for(i = 0; i < n; i++){
-                size = slip_unesc(pri->ibuf[start + i],
-                                pri->ibuf, &pri->pos, &pri->esc);
-                if(size){
-                        memcpy(buf, pri->ibuf, size);
-                        memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
-                        pri->more=n-(i+1); 
-                        return(size);
-                }
-        }
-        return(0);
+        return slip_proto_read(fd, buf, len, &pri->slip);
 }
 
 int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
 {
-        int actual, n;
-
-        actual = slip_esc(buf, pri->obuf, len);
-        n = net_write(fd, pri->obuf, actual);
-        if(n < 0) return(n);
-        else return(len);
+        return slip_proto_write(fd, buf, len, &pri->slip);
 }
 
 static int slip_set_mtu(int mtu, void *data)
@@ -267,14 +252,3 @@ struct net_user_info slip_user_info = {
         .delete_address = slip_del_addr,
         .max_packet     = BUF_SIZE
 };
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/drivers/slirp.h b/arch/um/drivers/slirp.h
index 04e407d1e44a..6cf88ab580c9 100644
--- a/arch/um/drivers/slirp.h
+++ b/arch/um/drivers/slirp.h
@@ -1,10 +1,7 @@
 #ifndef __UM_SLIRP_H
 #define __UM_SLIRP_H
 
-#define BUF_SIZE 1500
- /* two bytes each for a (pathological) max packet of escaped chars +  * 
-  * terminating END char + initial END char                            */
-#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+#include "slip_common.h"
 
 #define SLIRP_MAX_ARGS 100
 /*
@@ -24,28 +21,13 @@ struct slirp_data {
         struct arg_list_dummy_wrapper argw;
         int pid;
         int slave;
-        char ibuf[ENC_BUF_SIZE];
-        char obuf[ENC_BUF_SIZE];
-        int more; /* more data: do not read fd until ibuf has been drained */
-        int pos;
-        int esc;
+        struct slip_proto slip;
 };
 
 extern struct net_user_info slirp_user_info;
 
-extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
 extern int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri);
-extern int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri);
+extern int slirp_user_write(int fd, void *buf, int len,
+                            struct slirp_data *pri);
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
index c9d6b52a831d..9864d27afdbe 100644
--- a/arch/um/drivers/slirp_kern.c
+++ b/arch/um/drivers/slirp_kern.c
@@ -25,10 +25,7 @@ void slirp_init(struct net_device *dev, void *data)
                 { .argw         = init->argw,
                   .pid          = -1,
                   .slave        = -1,
-                  .ibuf         = { '\0' },
-                  .obuf         = { '\0' },
-                  .pos          = 0,
-                  .esc          = 0,
+                  .slip         = SLIP_PROTO_INIT,
                   .dev          = dev });
 
         dev->init = NULL;
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
index c322515c71cc..8d91f663d82c 100644
--- a/arch/um/drivers/slirp_user.c
+++ b/arch/um/drivers/slirp_user.c
@@ -12,7 +12,7 @@
 #include "user.h"
 #include "net_user.h"
 #include "slirp.h"
-#include "slip_proto.h"
+#include "slip_common.h"
 #include "helper.h"
 #include "os.h"
 
@@ -48,47 +48,32 @@ static int slirp_tramp(char **argv, int fd)
         return(pid);
 }
 
-/* XXX This is just a trivial wrapper around os_pipe */
-static int slirp_datachan(int *mfd, int *sfd)
-{
-        int fds[2], err;
-
-        err = os_pipe(fds, 1, 1);
-        if(err < 0){
-                printk("slirp_datachan: Failed to open pipe, err = %d\n", -err);
-                return(err);
-        }
-
-        *mfd = fds[0];
-        *sfd = fds[1];
-        return(0);
-}
-
 static int slirp_open(void *data)
 {
         struct slirp_data *pri = data;
-        int sfd, mfd, pid, err;
+        int fds[2], pid, err;
 
-        err = slirp_datachan(&mfd, &sfd);
+        err = os_pipe(fds, 1, 1);
         if(err)
                 return(err);
 
-        pid = slirp_tramp(pri->argw.argv, sfd);
-
-        if(pid < 0){
-                printk("slirp_tramp failed - errno = %d\n", -pid);
-                os_close_file(sfd);     
-                os_close_file(mfd);     
-                return(pid);
+        err = slirp_tramp(pri->argw.argv, fds[1]);
+        if(err < 0){
+                printk("slirp_tramp failed - errno = %d\n", -err);
+                goto out;
         }
-
-        pri->slave = sfd;
-        pri->pos = 0;
-        pri->esc = 0;
-
-        pri->pid = pid;
-
-        return(mfd);
+        pid = err;
+
+        pri->slave = fds[1];
+        pri->slip.pos = 0;
+        pri->slip.esc = 0;
+        pri->pid = err;
+
+        return(fds[0]);
+out:
+        os_close_file(fds[0]);
+        os_close_file(fds[1]);
+        return err;
 }
 
 static void slirp_close(int fd, void *data)
@@ -129,48 +114,12 @@ static void slirp_close(int fd, void *data)
 
 int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
 {
-        int i, n, size, start;
-
-        if(pri->more>0) {
-                i = 0;
-                while(i < pri->more) {
-                        size = slip_unesc(pri->ibuf[i++],
-                                        pri->ibuf,&pri->pos,&pri->esc);
-                        if(size){
-                                memcpy(buf, pri->ibuf, size);
-                                memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
-                                pri->more=pri->more-i; 
-                                return(size);
-                        }
-                }
-                pri->more=0;
-        }
-
-        n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
-        if(n <= 0) return(n);
-
-        start = pri->pos;
-        for(i = 0; i < n; i++){
-                size = slip_unesc(pri->ibuf[start + i],
-                                pri->ibuf,&pri->pos,&pri->esc);
-                if(size){
-                        memcpy(buf, pri->ibuf, size);
-                        memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
-                        pri->more=n-(i+1); 
-                        return(size);
-                }
-        }
-        return(0);
+        return slip_proto_read(fd, buf, len, &pri->slip);
 }
 
 int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
 {
-        int actual, n;
-
-        actual = slip_esc(buf, pri->obuf, len);
-        n = net_write(fd, pri->obuf, actual);
-        if(n < 0) return(n);
-        else return(len);
+        return slip_proto_write(fd, buf, len, &pri->slip);
 }
 
 static int slirp_set_mtu(int mtu, void *data)
@@ -188,14 +137,3 @@ struct net_user_info slirp_user_info = {
         .delete_address = NULL,
         .max_packet     = BUF_SIZE
 };
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index a2bac429f3d4..b32a77010fbe 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -22,7 +22,6 @@
 #include "init.h"
 #include "irq_user.h"
 #include "mconsole_kern.h"
-#include "2_5compat.h"
 
 static int ssl_version = 1;
 
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c
index 98565b53d170..429ae8e6c7e5 100644
--- a/arch/um/drivers/stderr_console.c
+++ b/arch/um/drivers/stderr_console.c
@@ -22,9 +22,9 @@ static void stderr_console_write(struct console *console, const char *string,
 }
 
 static struct console stderr_console = {
-        .name           "stderr",
-        .write          stderr_console_write,
-        .flags          CON_PRINTBUFFER,
+        .name           = "stderr",
+        .write          = stderr_console_write,
+        .flags          = CON_PRINTBUFFER,
 };
 
 static int __init stderr_console_init(void)
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 361d0be342b3..afbe1e71ed83 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -28,7 +28,6 @@
 #include "irq_user.h"
 #include "mconsole_kern.h"
 #include "init.h"
-#include "2_5compat.h"
 
 #define MAX_TTYS (16)
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 9a56ff94308d..2a7f6892c55c 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -49,13 +49,12 @@
 #include "irq_user.h"
 #include "irq_kern.h"
 #include "ubd_user.h"
-#include "2_5compat.h"
 #include "os.h"
 #include "mem.h"
 #include "mem_kern.h"
 #include "cow.h"
 
-enum ubd_req { UBD_READ, UBD_WRITE, UBD_MMAP };
+enum ubd_req { UBD_READ, UBD_WRITE };
 
 struct io_thread_req {
         enum ubd_req op;
@@ -68,8 +67,6 @@ struct io_thread_req {
         unsigned long sector_mask;
         unsigned long long cow_offset;
         unsigned long bitmap_words[2];
-        int map_fd;
-        unsigned long long map_offset;
         int error;
 };
 
@@ -122,10 +119,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
 
 #define MAX_DEV (8)
 
-/* Changed in early boot */
-static int ubd_do_mmap = 0;
-#define UBD_MMAP_BLOCK_SIZE PAGE_SIZE
-
 static struct block_device_operations ubd_blops = {
         .owner          = THIS_MODULE,
         .open           = ubd_open,
@@ -175,12 +168,6 @@ struct ubd {
         int no_cow;
         struct cow cow;
         struct platform_device pdev;
-
-        int map_writes;
-        int map_reads;
-        int nomap_writes;
-        int nomap_reads;
-        int write_maps;
 };
 
 #define DEFAULT_COW { \
@@ -200,11 +187,6 @@ struct ubd {
         .openflags =            OPEN_FLAGS, \
         .no_cow =               0, \
         .cow =                  DEFAULT_COW, \
-        .map_writes             = 0, \
-        .map_reads              = 0, \
-        .nomap_writes           = 0, \
-        .nomap_reads            = 0, \
-        .write_maps             = 0, \
 }
 
 struct ubd ubd_dev[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
@@ -314,13 +296,6 @@ static int ubd_setup_common(char *str, int *index_out)
                 int major;
 
                 str++;
-                if(!strcmp(str, "mmap")){
-                        CHOOSE_MODE(printk("mmap not supported by the ubd "
-                                           "driver in tt mode\n"),
-                                    ubd_do_mmap = 1);
-                        return(0);
-                }
-
                 if(!strcmp(str, "sync")){
                         global_openflags = of_sync(global_openflags);
                         return(0);
@@ -464,9 +439,9 @@ static int udb_setup(char *str)
 __setup("udb", udb_setup);
 __uml_help(udb_setup,
 "udb\n"
-"    This option is here solely to catch ubd -> udb typos, which can be\n\n"
-"    to impossible to catch visually unless you specifically look for\n\n"
-"    them.  The only result of any option starting with 'udb' is an error\n\n"
+"    This option is here solely to catch ubd -> udb typos, which can be\n"
+"    to impossible to catch visually unless you specifically look for\n"
+"    them.  The only result of any option starting with 'udb' is an error\n"
 "    in the boot output.\n\n"
 );
 
@@ -524,7 +499,7 @@ static void ubd_handler(void)
 {
         struct io_thread_req req;
         struct request *rq = elv_next_request(ubd_queue);
-        int n, err;
+        int n;
 
         do_ubd = NULL;
         intr_count++;
@@ -538,19 +513,6 @@ static void ubd_handler(void)
                 return;
         }
         
-        if((req.op != UBD_MMAP) &&
-           ((req.offset != ((__u64) (rq->sector)) << 9) ||
-            (req.length != (rq->current_nr_sectors) << 9)))
-                panic("I/O op mismatch");
-        
-        if(req.map_fd != -1){
-                err = physmem_subst_mapping(req.buffer, req.map_fd,
-                                            req.map_offset, 1);
-                if(err)
-                        printk("ubd_handler - physmem_subst_mapping failed, "
-                               "err = %d\n", -err);
-        }
-
         ubd_finish(rq, req.error);
         reactivate_fd(thread_fd, UBD_IRQ);      
         do_ubd_request(ubd_queue);
@@ -583,14 +545,10 @@ static int ubd_file_size(struct ubd *dev, __u64 *size_out)
 
 static void ubd_close(struct ubd *dev)
 {
-        if(ubd_do_mmap)
-                physmem_forget_descriptor(dev->fd);
         os_close_file(dev->fd);
         if(dev->cow.file == NULL)
                 return;
 
-        if(ubd_do_mmap)
-                physmem_forget_descriptor(dev->cow.fd);
         os_close_file(dev->cow.fd);
         vfree(dev->cow.bitmap);
         dev->cow.bitmap = NULL;
@@ -1010,94 +968,13 @@ static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
                            req->bitmap_words, bitmap_len);
 }
 
-static int mmap_fd(struct request *req, struct ubd *dev, __u64 offset)
-{
-        __u64 sector;
-        unsigned char *bitmap;
-        int bit, i;
-
-        /* mmap must have been requested on the command line */
-        if(!ubd_do_mmap)
-                return(-1);
-
-        /* The buffer must be page aligned */
-        if(((unsigned long) req->buffer % UBD_MMAP_BLOCK_SIZE) != 0)
-                return(-1);
-
-        /* The request must be a page long */
-        if((req->current_nr_sectors << 9) != PAGE_SIZE)
-                return(-1);
-
-        if(dev->cow.file == NULL)
-                return(dev->fd);
-
-        sector = offset >> 9;
-        bitmap = (unsigned char *) dev->cow.bitmap;
-        bit = ubd_test_bit(sector, bitmap);
-
-        for(i = 1; i < req->current_nr_sectors; i++){
-                if(ubd_test_bit(sector + i, bitmap) != bit)
-                        return(-1);
-        }
-
-        if(bit || (rq_data_dir(req) == WRITE))
-                offset += dev->cow.data_offset;
-
-        /* The data on disk must be page aligned */
-        if((offset % UBD_MMAP_BLOCK_SIZE) != 0)
-                return(-1);
-
-        return(bit ? dev->fd : dev->cow.fd);
-}
-
-static int prepare_mmap_request(struct ubd *dev, int fd, __u64 offset,
-                                struct request *req,
-                                struct io_thread_req *io_req)
-{
-        int err;
-
-        if(rq_data_dir(req) == WRITE){
-                /* Writes are almost no-ops since the new data is already in the
-                 * host page cache
-                 */
-                dev->map_writes++;
-                if(dev->cow.file != NULL)
-                        cowify_bitmap(io_req->offset, io_req->length,
-                                      &io_req->sector_mask, &io_req->cow_offset,
-                                      dev->cow.bitmap, dev->cow.bitmap_offset,
-                                      io_req->bitmap_words,
-                                      dev->cow.bitmap_len);
-        }
-        else {
-                int w;
-
-                if((dev->cow.file != NULL) && (fd == dev->cow.fd))
-                        w = 0;
-                else w = dev->openflags.w;
-
-                if((dev->cow.file != NULL) && (fd == dev->fd))
-                        offset += dev->cow.data_offset;
-
-                err = physmem_subst_mapping(req->buffer, fd, offset, w);
-                if(err){
-                        printk("physmem_subst_mapping failed, err = %d\n",
-                               -err);
-                        return(1);
-                }
-                dev->map_reads++;
-        }
-        io_req->op = UBD_MMAP;
-        io_req->buffer = req->buffer;
-        return(0);
-}
-
 /* Called with ubd_io_lock held */
 static int prepare_request(struct request *req, struct io_thread_req *io_req)
 {
         struct gendisk *disk = req->rq_disk;
         struct ubd *dev = disk->private_data;
         __u64 offset;
-        int len, fd;
+        int len;
 
         if(req->rq_status == RQ_INACTIVE) return(1);
 
@@ -1114,34 +991,12 @@ static int prepare_request(struct request *req, struct io_thread_req *io_req)
 
         io_req->fds[0] = (dev->cow.file != NULL) ? dev->cow.fd : dev->fd;
         io_req->fds[1] = dev->fd;
-        io_req->map_fd = -1;
         io_req->cow_offset = -1;
         io_req->offset = offset;
         io_req->length = len;
         io_req->error = 0;
         io_req->sector_mask = 0;
 
-        fd = mmap_fd(req, dev, io_req->offset);
-        if(fd > 0){
-                /* If mmapping is otherwise OK, but the first access to the
-                 * page is a write, then it's not mapped in yet.  So we have
-                 * to write the data to disk first, then we can map the disk
-                 * page in and continue normally from there.
-                 */
-                if((rq_data_dir(req) == WRITE) && !is_remapped(req->buffer)){
-                        io_req->map_fd = dev->fd;
-                        io_req->map_offset = io_req->offset +
-                                dev->cow.data_offset;
-                        dev->write_maps++;
-                }
-                else return(prepare_mmap_request(dev, fd, io_req->offset, req,
-                                                 io_req));
-        }
-
-        if(rq_data_dir(req) == READ)
-                dev->nomap_reads++;
-        else dev->nomap_writes++;
-
         io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
         io_req->offsets[0] = 0;
         io_req->offsets[1] = dev->cow.data_offset;
@@ -1229,143 +1084,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
         return(-EINVAL);
 }
 
-static int ubd_check_remapped(int fd, unsigned long address, int is_write,
-                              __u64 offset)
-{
-        __u64 bitmap_offset;
-        unsigned long new_bitmap[2];
-        int i, err, n;
-
-        /* If it's not a write access, we can't do anything about it */
-        if(!is_write)
-                return(0);
-
-        /* We have a write */
-        for(i = 0; i < sizeof(ubd_dev) / sizeof(ubd_dev[0]); i++){
-                struct ubd *dev = &ubd_dev[i];
-
-                if((dev->fd != fd) && (dev->cow.fd != fd))
-                        continue;
-
-                /* It's a write to a ubd device */
-
-                /* This should be impossible now */
-                if(!dev->openflags.w){
-                        /* It's a write access on a read-only device - probably
-                         * shouldn't happen.  If the kernel is trying to change
-                         * something with no intention of writing it back out,
-                         * then this message will clue us in that this needs
-                         * fixing
-                         */
-                        printk("Write access to mapped page from readonly ubd "
-                               "device %d\n", i);
-                        return(0);
-                }
-
-                /* It's a write to a writeable ubd device - it must be COWed
-                 * because, otherwise, the page would have been mapped in
-                 * writeable
-                 */
-
-                if(!dev->cow.file)
-                        panic("Write fault on writeable non-COW ubd device %d",
-                              i);
-
-                /* It should also be an access to the backing file since the
-                 * COW pages should be mapped in read-write
-                 */
-
-                if(fd == dev->fd)
-                        panic("Write fault on a backing page of ubd "
-                              "device %d\n", i);
-
-                /* So, we do the write, copying the backing data to the COW
-                 * file...
-                 */
-
-                err = os_seek_file(dev->fd, offset + dev->cow.data_offset);
-                if(err < 0)
-                        panic("Couldn't seek to %lld in COW file of ubd "
-                              "device %d, err = %d",
-                              offset + dev->cow.data_offset, i, -err);
-
-                n = os_write_file(dev->fd, (void *) address, PAGE_SIZE);
-                if(n != PAGE_SIZE)
-                        panic("Couldn't copy data to COW file of ubd "
-                              "device %d, err = %d", i, -n);
-
-                /* ... updating the COW bitmap... */
-
-                cowify_bitmap(offset, PAGE_SIZE, NULL, &bitmap_offset,
-                              dev->cow.bitmap, dev->cow.bitmap_offset,
-                              new_bitmap, dev->cow.bitmap_len);
-
-                err = os_seek_file(dev->fd, bitmap_offset);
-                if(err < 0)
-                        panic("Couldn't seek to %lld in COW file of ubd "
-                              "device %d, err = %d", bitmap_offset, i, -err);
-
-                n = os_write_file(dev->fd, new_bitmap, sizeof(new_bitmap));
-                if(n != sizeof(new_bitmap))
-                        panic("Couldn't update bitmap  of ubd device %d, "
-                              "err = %d", i, -n);
-
-                /* Maybe we can map the COW page in, and maybe we can't.  If
-                 * it is a pre-V3 COW file, we can't, since the alignment will
-                 * be wrong.  If it is a V3 or later COW file which has been
-                 * moved to a system with a larger page size, then maybe we
-                 * can't, depending on the exact location of the page.
-                 */
-
-                offset += dev->cow.data_offset;
-
-                /* Remove the remapping, putting the original anonymous page
-                 * back.  If the COW file can be mapped in, that is done.
-                 * Otherwise, the COW page is read in.
-                 */
-
-                if(!physmem_remove_mapping((void *) address))
-                        panic("Address 0x%lx not remapped by ubd device %d",
-                              address, i);
-                if((offset % UBD_MMAP_BLOCK_SIZE) == 0)
-                        physmem_subst_mapping((void *) address, dev->fd,
-                                              offset, 1);
-                else {
-                        err = os_seek_file(dev->fd, offset);
-                        if(err < 0)
-                                panic("Couldn't seek to %lld in COW file of "
-                                      "ubd device %d, err = %d", offset, i,
-                                      -err);
-
-                        n = os_read_file(dev->fd, (void *) address, PAGE_SIZE);
-                        if(n != PAGE_SIZE)
-                                panic("Failed to read page from offset %llx of "
-                                      "COW file of ubd device %d, err = %d",
-                                      offset, i, -n);
-                }
-
-                return(1);
-        }
-
-        /* It's not a write on a ubd device */
-        return(0);
-}
-
-static struct remapper ubd_remapper = {
-        .list   = LIST_HEAD_INIT(ubd_remapper.list),
-        .proc   = ubd_check_remapped,
-};
-
-static int ubd_remapper_setup(void)
-{
-        if(ubd_do_mmap)
-                register_remapper(&ubd_remapper);
-
-        return(0);
-}
-
-__initcall(ubd_remapper_setup);
-
 static int same_backing_files(char *from_cmdline, char *from_cow, char *cow)
 {
         struct uml_stat buf1, buf2;
@@ -1568,15 +1286,6 @@ void do_io(struct io_thread_req *req)
         int err;
         __u64 off;
 
-        if(req->op == UBD_MMAP){
-                /* Touch the page to force the host to do any necessary IO to
-                 * get it into memory
-                 */
-                n = *((volatile int *) req->buffer);
-                req->error = update_bitmap(req);
-                return;
-        }
-
         nsectors = req->length / req->sectorsize;
         start = 0;
         do {
diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
index 7917b9d1cec8..a4fdf3584ad2 100644
--- a/arch/um/drivers/xterm_kern.c
+++ b/arch/um/drivers/xterm_kern.c
@@ -7,7 +7,6 @@
 #include "linux/slab.h"
 #include "linux/signal.h"
 #include "linux/interrupt.h"
-#include "asm/semaphore.h"
 #include "asm/irq.h"
 #include "irq_user.h"
 #include "irq_kern.h"
diff --git a/arch/um/include/2_5compat.h b/arch/um/include/2_5compat.h
deleted file mode 100644
index abdb015a4d71..000000000000
--- a/arch/um/include/2_5compat.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/* 
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __2_5_COMPAT_H__
-#define __2_5_COMPAT_H__
-
-#define INIT_HARDSECT(arr, maj, sizes)
-
-#define SET_PRI(task) do ; while(0)
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/include/common-offsets.h b/arch/um/include/common-offsets.h
new file mode 100644
index 000000000000..d705daa2d854
--- /dev/null
+++ b/arch/um/include/common-offsets.h
@@ -0,0 +1,14 @@
+/* for use by sys-$SUBARCH/kernel-offsets.c */
+
+OFFSET(TASK_REGS, task_struct, thread.regs);
+OFFSET(TASK_PID, task_struct, pid);
+DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+DEFINE_STR(UM_KERN_EMERG, KERN_EMERG);
+DEFINE_STR(UM_KERN_ALERT, KERN_ALERT);
+DEFINE_STR(UM_KERN_CRIT, KERN_CRIT);
+DEFINE_STR(UM_KERN_ERR, KERN_ERR);
+DEFINE_STR(UM_KERN_WARNING, KERN_WARNING);
+DEFINE_STR(UM_KERN_NOTICE, KERN_NOTICE);
+DEFINE_STR(UM_KERN_INFO, KERN_INFO);
+DEFINE_STR(UM_KERN_DEBUG, KERN_DEBUG);
diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 15389c886b41..e5fec5570199 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -8,6 +8,7 @@
 
 #include "linux/threads.h"
 #include "sysdep/ptrace.h"
+#include "sysdep/faultinfo.h"
 
 extern int ncpus;
 extern char *linux_prog;
@@ -31,8 +32,8 @@ extern int current_pid(void);
 extern unsigned long alloc_stack(int order, int atomic);
 extern int do_signal(void);
 extern int is_stack_fault(unsigned long sp);
-extern unsigned long segv(unsigned long address, unsigned long ip, 
-                          int is_write, int is_user, void *sc);
+extern unsigned long segv(struct faultinfo fi, unsigned long ip,
+                          int is_user, void *sc);
 extern int handle_page_fault(unsigned long address, unsigned long ip,
                              int is_write, int is_user, int *code_out);
 extern void syscall_ready(void);
@@ -82,7 +83,7 @@ extern void timer_irq(union uml_pt_regs *regs);
 extern void unprotect_stack(unsigned long stack);
 extern void do_uml_exitcalls(void);
 extern int attach_debugger(int idle_pid, int pid, int stop);
-extern void bad_segv(unsigned long address, unsigned long ip, int is_write);
+extern void bad_segv(struct faultinfo fi, unsigned long ip);
 extern int config_gdb(char *str);
 extern int remove_gdb(void);
 extern char *uml_strdup(char *string);
diff --git a/arch/um/include/mconsole.h b/arch/um/include/mconsole.h
index 9fbe3083fdd8..cfa368e045a5 100644
--- a/arch/um/include/mconsole.h
+++ b/arch/um/include/mconsole.h
@@ -56,7 +56,7 @@ struct mc_request
         int as_interrupt;
 
         int originating_fd;
-        int originlen;
+        unsigned int originlen;
         unsigned char origin[128];                      /* sockaddr_un */
 
         struct mconsole_request request;
diff --git a/arch/um/include/net_user.h b/arch/um/include/net_user.h
index 36807b796e9f..89885a77a771 100644
--- a/arch/um/include/net_user.h
+++ b/arch/um/include/net_user.h
@@ -35,7 +35,7 @@ extern void *get_output_buffer(int *len_out);
 extern void free_output_buffer(void *buffer);
 
 extern int tap_open_common(void *dev, char *gate_addr);
-extern void tap_check_ips(char *gate_addr, char *eth_addr);
+extern void tap_check_ips(char *gate_addr, unsigned char *eth_addr);
 
 extern void read_output(int fd, char *output_out, int len);
 
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 07340c8cf203..881d2988d2d8 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -136,7 +136,7 @@ extern int os_seek_file(int fd, __u64 offset);
 extern int os_open_file(char *file, struct openflags flags, int mode);
 extern int os_read_file(int fd, void *buf, int len);
 extern int os_write_file(int fd, const void *buf, int count);
-extern int os_file_size(char *file, long long *size_out);
+extern int os_file_size(char *file, unsigned long long *size_out);
 extern int os_file_modtime(char *file, unsigned long *modtime);
 extern int os_pipe(int *fd, int stream, int close_on_exec);
 extern int os_set_fd_async(int fd, int owner);
@@ -160,6 +160,7 @@ extern void os_kill_process(int pid, int reap_child);
 extern void os_kill_ptraced_process(int pid, int reap_child);
 extern void os_usr1_process(int pid);
 extern int os_getpid(void);
+extern int os_getpgrp(void);
 
 extern int os_map_memory(void *virt, int fd, unsigned long long off,
                          unsigned long len, int r, int w, int x);
diff --git a/arch/um/include/skas_ptrace.h b/arch/um/include/skas_ptrace.h
index cfb5fb4f5b91..cd2327d09c8d 100644
--- a/arch/um/include/skas_ptrace.h
+++ b/arch/um/include/skas_ptrace.h
@@ -6,22 +6,11 @@
 #ifndef __SKAS_PTRACE_H
 #define __SKAS_PTRACE_H
 
-struct ptrace_faultinfo {
-        int is_write;
-        unsigned long addr;
-};
-
-struct ptrace_ldt {
-        int func;
-        void *ptr;
-        unsigned long bytecount;
-};
-
 #define PTRACE_FAULTINFO 52
-#define PTRACE_SIGPENDING 53
-#define PTRACE_LDT 54
 #define PTRACE_SWITCH_MM 55
 
+#include "sysdep/skas_ptrace.h"
+
 #endif
 
 /*
diff --git a/arch/um/include/sysdep-i386/checksum.h b/arch/um/include/sysdep-i386/checksum.h
index 3a2a45811aa3..764ba4db4788 100644
--- a/arch/um/include/sysdep-i386/checksum.h
+++ b/arch/um/include/sysdep-i386/checksum.h
@@ -24,19 +24,6 @@ unsigned int csum_partial(const unsigned char * buff, int len,
                           unsigned int sum);
 
 /*
- * the same as csum_partial, but copies from src while it
- * checksums, and handles user-space pointer exceptions correctly, when needed.
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-
-unsigned int csum_partial_copy_to(const unsigned char *src, unsigned char *dst,
-                                  int len, int sum, int *err_ptr);
-unsigned int csum_partial_copy_from(const unsigned char *src, unsigned char *dst,
-                                    int len, int sum, int *err_ptr);
-
-/*
  *      Note: when you get a NULL pointer exception here this means someone
  *      passed in an incorrect kernel address to one of these functions.
  *
@@ -52,11 +39,24 @@ unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char *
         return(csum_partial(dst, len, sum));
 }
 
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
 static __inline__
 unsigned int csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst,
                                          int len, int sum, int *err_ptr)
 {
-        return csum_partial_copy_from(src, dst, len, sum, err_ptr);
+        if(copy_from_user(dst, src, len)){
+                *err_ptr = -EFAULT;
+                return(-1);
+        }
+
+        return csum_partial(dst, len, sum);
 }
 
 /*
@@ -67,7 +67,6 @@ unsigned int csum_partial_copy_from_user(const unsigned char *src, unsigned char
  */
 
 #define csum_partial_copy_fromuser csum_partial_copy_from_user
-unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, int len, int sum);
 
 /*
  *      This is a version of ip_compute_csum() optimized for IP headers,
@@ -196,8 +195,14 @@ static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
                                                      unsigned char *dst,
                                                      int len, int sum, int *err_ptr)
 {
-        if (access_ok(VERIFY_WRITE, dst, len))
-                return(csum_partial_copy_to(src, dst, len, sum, err_ptr));
+        if (access_ok(VERIFY_WRITE, dst, len)){
+                if(copy_to_user(dst, src, len)){
+                        *err_ptr = -EFAULT;
+                        return(-1);
+                }
+
+                return csum_partial(src, len, sum);
+        }
 
         if (len)
                 *err_ptr = -EFAULT;
diff --git a/arch/um/include/sysdep-i386/faultinfo.h b/arch/um/include/sysdep-i386/faultinfo.h
new file mode 100644
index 000000000000..db437cc373bc
--- /dev/null
+++ b/arch/um/include/sysdep-i386/faultinfo.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
+ * Licensed under the GPL
+ */
+
+#ifndef __FAULTINFO_I386_H
+#define __FAULTINFO_I386_H
+
+/* this structure contains the full arch-specific faultinfo
+ * from the traps.
+ * On i386, ptrace_faultinfo unfortunately doesn't provide
+ * all the info, since trap_no is missing.
+ * All common elements are defined at the same position in
+ * both structures, thus making it easy to copy the
+ * contents without knowledge about the structure elements.
+ */
+struct faultinfo {
+        int error_code; /* in ptrace_faultinfo misleadingly called is_write */
+        unsigned long cr2; /* in ptrace_faultinfo called addr */
+        int trap_no; /* missing in ptrace_faultinfo */
+};
+
+#define FAULT_WRITE(fi) ((fi).error_code & 2)
+#define FAULT_ADDRESS(fi) ((fi).cr2)
+
+#define PTRACE_FULL_FAULTINFO 0
+
+#endif
diff --git a/arch/um/include/sysdep-i386/ptrace.h b/arch/um/include/sysdep-i386/ptrace.h
index 661d495e2044..c8ee9559f3ab 100644
--- a/arch/um/include/sysdep-i386/ptrace.h
+++ b/arch/um/include/sysdep-i386/ptrace.h
@@ -8,6 +8,8 @@
 
 #include "uml-config.h"
 #include "user_constants.h"
+#include "sysdep/faultinfo.h"
+#include "choose-mode.h"
 
 #define MAX_REG_NR (UM_FRAME_SIZE / sizeof(unsigned long))
 #define MAX_REG_OFFSET (UM_FRAME_SIZE)
@@ -53,24 +55,17 @@ extern int sysemu_supported;
 
 #define REGS_RESTART_SYSCALL(r) IP_RESTART_SYSCALL(REGS_IP(r))
 
-#define REGS_SEGV_IS_FIXABLE(r) SEGV_IS_FIXABLE((r)->trap_type)
-
-#define REGS_FAULT_ADDR(r) ((r)->fault_addr)
-
-#define REGS_FAULT_WRITE(r) FAULT_WRITE((r)->fault_type)
-
 #endif
 #ifndef PTRACE_SYSEMU_SINGLESTEP
 #define PTRACE_SYSEMU_SINGLESTEP 32
 #endif
 
-#include "choose-mode.h"
-
 union uml_pt_regs {
 #ifdef UML_CONFIG_MODE_TT
         struct tt_regs {
                 long syscall;
                 void *sc;
+                struct faultinfo faultinfo;
         } tt;
 #endif
 #ifdef UML_CONFIG_MODE_SKAS
@@ -78,9 +73,7 @@ union uml_pt_regs {
                 unsigned long regs[HOST_FRAME_SIZE];
                 unsigned long fp[HOST_FP_SIZE];
                 unsigned long xfp[HOST_XFP_SIZE];
-                unsigned long fault_addr;
-                unsigned long fault_type;
-                unsigned long trap_type;
+                struct faultinfo faultinfo;
                 long syscall;
                 int is_user;
         } skas;
@@ -217,15 +210,8 @@ struct syscall_args {
 #define UPT_SYSCALL_NR(r) UPT_ORIG_EAX(r)
 #define UPT_SYSCALL_RET(r) UPT_EAX(r)
 
-#define UPT_SEGV_IS_FIXABLE(r) \
-        CHOOSE_MODE(SC_SEGV_IS_FIXABLE(UPT_SC(r)), \
-                    REGS_SEGV_IS_FIXABLE(&r->skas))
-
-#define UPT_FAULT_ADDR(r) \
-        __CHOOSE_MODE(SC_FAULT_ADDR(UPT_SC(r)), REGS_FAULT_ADDR(&r->skas))
-
-#define UPT_FAULT_WRITE(r) \
-        CHOOSE_MODE(SC_FAULT_WRITE(UPT_SC(r)), REGS_FAULT_WRITE(&r->skas))
+#define UPT_FAULTINFO(r) \
+        CHOOSE_MODE((&(r)->tt.faultinfo), (&(r)->skas.faultinfo))
 
 #endif
 
diff --git a/arch/um/include/sysdep-i386/sigcontext.h b/arch/um/include/sysdep-i386/sigcontext.h
index dfee589de360..1fe729265167 100644
--- a/arch/um/include/sysdep-i386/sigcontext.h
+++ b/arch/um/include/sysdep-i386/sigcontext.h
@@ -13,15 +13,12 @@
 #define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
 #define SC_SET_SYSCALL_RETURN(sc, result) SC_EAX(sc) = (result)
 
-#define SC_FAULT_ADDR(sc) SC_CR2(sc)
-#define SC_FAULT_TYPE(sc) SC_ERR(sc)
-
-#define FAULT_WRITE(err) (err & 2)
-#define TO_SC_ERR(is_write) ((is_write) ? 2 : 0)
-
-#define SC_FAULT_WRITE(sc) (FAULT_WRITE(SC_ERR(sc)))
-
-#define SC_TRAP_TYPE(sc) SC_TRAPNO(sc)
+#define GET_FAULTINFO_FROM_SC(fi,sc) \
+        { \
+                (fi).cr2 = SC_CR2(sc); \
+                (fi).error_code = SC_ERR(sc); \
+                (fi).trap_no = SC_TRAPNO(sc); \
+        }
 
 /* ptrace expects that, at the start of a system call, %eax contains
  * -ENOSYS, so this makes it so.
@@ -29,9 +26,7 @@
 #define SC_START_SYSCALL(sc) do SC_EAX(sc) = -ENOSYS; while(0)
 
 /* This is Page Fault */
-#define SEGV_IS_FIXABLE(trap) (trap == 14)
-
-#define SC_SEGV_IS_FIXABLE(sc) (SEGV_IS_FIXABLE(SC_TRAPNO(sc)))
+#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
 
 extern unsigned long *sc_sigmask(void *sc_ptr);
 extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
diff --git a/arch/um/include/sysdep-i386/signal.h b/arch/um/include/sysdep-i386/signal.h
index b1e1f7a77499..07518b162136 100644
--- a/arch/um/include/sysdep-i386/signal.h
+++ b/arch/um/include/sysdep-i386/signal.h
@@ -8,6 +8,8 @@
 
 #include <signal.h>
 
+#define ARCH_SIGHDLR_PARAM int sig
+
 #define ARCH_GET_SIGCONTEXT(sc, sig) \
         do sc = (struct sigcontext *) (&sig + 1); while(0)
 
diff --git a/arch/um/include/sysdep-i386/skas_ptrace.h b/arch/um/include/sysdep-i386/skas_ptrace.h
new file mode 100644
index 000000000000..e27b8a791773
--- /dev/null
+++ b/arch/um/include/sysdep-i386/skas_ptrace.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_I386_SKAS_PTRACE_H
+#define __SYSDEP_I386_SKAS_PTRACE_H
+
+struct ptrace_faultinfo {
+        int is_write;
+        unsigned long addr;
+};
+
+struct ptrace_ldt {
+        int func;
+        void *ptr;
+        unsigned long bytecount;
+};
+
+#define PTRACE_LDT 54
+
+#endif
diff --git a/arch/um/include/sysdep-ia64/skas_ptrace.h b/arch/um/include/sysdep-ia64/skas_ptrace.h
new file mode 100644
index 000000000000..25a38e715702
--- /dev/null
+++ b/arch/um/include/sysdep-ia64/skas_ptrace.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_IA64_SKAS_PTRACE_H
+#define __SYSDEP_IA64_SKAS_PTRACE_H
+
+struct ptrace_faultinfo {
+        int is_write;
+        unsigned long addr;
+};
+
+struct ptrace_ldt {
+        int func;
+        void *ptr;
+        unsigned long bytecount;
+};
+
+#define PTRACE_LDT 54
+
+#endif
diff --git a/arch/um/include/sysdep-ppc/skas_ptrace.h b/arch/um/include/sysdep-ppc/skas_ptrace.h
new file mode 100644
index 000000000000..d9fbbac10de0
--- /dev/null
+++ b/arch/um/include/sysdep-ppc/skas_ptrace.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_PPC_SKAS_PTRACE_H
+#define __SYSDEP_PPC_SKAS_PTRACE_H
+
+struct ptrace_faultinfo {
+        int is_write;
+        unsigned long addr;
+};
+
+struct ptrace_ldt {
+        int func;
+        void *ptr;
+        unsigned long bytecount;
+};
+
+#define PTRACE_LDT 54
+
+#endif
diff --git a/arch/um/include/sysdep-x86_64/checksum.h b/arch/um/include/sysdep-x86_64/checksum.h
index 572c6c19be33..ea97005af694 100644
--- a/arch/um/include/sysdep-x86_64/checksum.h
+++ b/arch/um/include/sysdep-x86_64/checksum.h
@@ -9,8 +9,6 @@
 #include "linux/in6.h"
 #include "asm/uaccess.h"
 
-extern unsigned int csum_partial_copy_from(const unsigned char *src, unsigned char *dst, int len,
-                                           int sum, int *err_ptr);
 extern unsigned csum_partial(const unsigned char *buff, unsigned len,
                              unsigned sum);
 
@@ -31,10 +29,15 @@ unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char *
 }
 
 static __inline__
-unsigned int csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst,
-                                         int len, int sum, int *err_ptr)
+unsigned int csum_partial_copy_from_user(const unsigned char *src,
+                                         unsigned char *dst, int len, int sum,
+                                         int *err_ptr)
 {
-        return csum_partial_copy_from(src, dst, len, sum, err_ptr);
+        if(copy_from_user(dst, src, len)){
+                *err_ptr = -EFAULT;
+                return(-1);
+        }
+        return csum_partial(dst, len, sum);
 }
 
 /**
@@ -137,15 +140,6 @@ static inline unsigned add32_with_carry(unsigned a, unsigned b)
         return a;
 }
 
-#endif
+extern unsigned short ip_compute_csum(unsigned char * buff, int len);
 
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+#endif
diff --git a/arch/um/include/sysdep-x86_64/faultinfo.h b/arch/um/include/sysdep-x86_64/faultinfo.h
new file mode 100644
index 000000000000..cb917b0d5660
--- /dev/null
+++ b/arch/um/include/sysdep-x86_64/faultinfo.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
+ * Licensed under the GPL
+ */
+
+#ifndef __FAULTINFO_X86_64_H
+#define __FAULTINFO_X86_64_H
+
+/* this structure contains the full arch-specific faultinfo
+ * from the traps.
+ * On i386, ptrace_faultinfo unfortunately doesn't provide
+ * all the info, since trap_no is missing.
+ * All common elements are defined at the same position in
+ * both structures, thus making it easy to copy the
+ * contents without knowledge about the structure elements.
+ */
+struct faultinfo {
+        int error_code; /* in ptrace_faultinfo misleadingly called is_write */
+        unsigned long cr2; /* in ptrace_faultinfo called addr */
+        int trap_no; /* missing in ptrace_faultinfo */
+};
+
+#define FAULT_WRITE(fi) ((fi).error_code & 2)
+#define FAULT_ADDRESS(fi) ((fi).cr2)
+
+#define PTRACE_FULL_FAULTINFO 1
+
+#endif
diff --git a/arch/um/include/sysdep-x86_64/ptrace.h b/arch/um/include/sysdep-x86_64/ptrace.h
index 915c82daffbd..be8acd5efd97 100644
--- a/arch/um/include/sysdep-x86_64/ptrace.h
+++ b/arch/um/include/sysdep-x86_64/ptrace.h
@@ -9,6 +9,7 @@
 
 #include "uml-config.h"
 #include "user_constants.h"
+#include "sysdep/faultinfo.h"
 
 #define MAX_REG_OFFSET (UM_FRAME_SIZE)
 #define MAX_REG_NR ((MAX_REG_OFFSET) / sizeof(unsigned long))
@@ -83,6 +84,7 @@ union uml_pt_regs {
                 long syscall;
                 unsigned long orig_rax;
                 void *sc;
+                struct faultinfo faultinfo;
         } tt;
 #endif
 #ifdef UML_CONFIG_MODE_SKAS
@@ -90,9 +92,7 @@ union uml_pt_regs {
                 /* XXX */
                 unsigned long regs[27];
                 unsigned long fp[65];
-                unsigned long fault_addr;
-                unsigned long fault_type;
-                unsigned long trap_type;
+                struct faultinfo faultinfo;
                 long syscall;
                 int is_user;
         } skas;
@@ -135,6 +135,7 @@ extern int mode_tt;
         __CHOOSE_MODE(SC_EFLAGS(UPT_SC(r)), REGS_EFLAGS((r)->skas.regs))
 #define UPT_SC(r) ((r)->tt.sc)
 #define UPT_SYSCALL_NR(r) __CHOOSE_MODE((r)->tt.syscall, (r)->skas.syscall)
+#define UPT_SYSCALL_RET(r) UPT_RAX(r)
 
 extern int user_context(unsigned long sp);
 
@@ -196,32 +197,32 @@ struct syscall_args {
 
 
 #define UPT_SET(regs, reg, val) \
-        ({      unsigned long val; \
+        ({      unsigned long __upt_val = val; \
                 switch(reg){ \
-                case R8: UPT_R8(regs) = val; break; \
-                case R9: UPT_R9(regs) = val; break; \
-                case R10: UPT_R10(regs) = val; break; \
-                case R11: UPT_R11(regs) = val; break; \
-                case R12: UPT_R12(regs) = val; break; \
-                case R13: UPT_R13(regs) = val; break; \
-                case R14: UPT_R14(regs) = val; break; \
-                case R15: UPT_R15(regs) = val; break; \
-                case RIP: UPT_IP(regs) = val; break; \
-                case RSP: UPT_SP(regs) = val; break; \
-                case RAX: UPT_RAX(regs) = val; break; \
-                case RBX: UPT_RBX(regs) = val; break; \
-                case RCX: UPT_RCX(regs) = val; break; \
-                case RDX: UPT_RDX(regs) = val; break; \
-                case RSI: UPT_RSI(regs) = val; break; \
-                case RDI: UPT_RDI(regs) = val; break; \
-                case RBP: UPT_RBP(regs) = val; break; \
-                case ORIG_RAX: UPT_ORIG_RAX(regs) = val; break; \
-                case CS: UPT_CS(regs) = val; break; \
-                case DS: UPT_DS(regs) = val; break; \
-                case ES: UPT_ES(regs) = val; break; \
-                case FS: UPT_FS(regs) = val; break; \
-                case GS: UPT_GS(regs) = val; break; \
-                case EFLAGS: UPT_EFLAGS(regs) = val; break; \
+                case R8: UPT_R8(regs) = __upt_val; break; \
+                case R9: UPT_R9(regs) = __upt_val; break; \
+                case R10: UPT_R10(regs) = __upt_val; break; \
+                case R11: UPT_R11(regs) = __upt_val; break; \
+                case R12: UPT_R12(regs) = __upt_val; break; \
+                case R13: UPT_R13(regs) = __upt_val; break; \
+                case R14: UPT_R14(regs) = __upt_val; break; \
+                case R15: UPT_R15(regs) = __upt_val; break; \
+                case RIP: UPT_IP(regs) = __upt_val; break; \
+                case RSP: UPT_SP(regs) = __upt_val; break; \
+                case RAX: UPT_RAX(regs) = __upt_val; break; \
+                case RBX: UPT_RBX(regs) = __upt_val; break; \
+                case RCX: UPT_RCX(regs) = __upt_val; break; \
+                case RDX: UPT_RDX(regs) = __upt_val; break; \
+                case RSI: UPT_RSI(regs) = __upt_val; break; \
+                case RDI: UPT_RDI(regs) = __upt_val; break; \
+                case RBP: UPT_RBP(regs) = __upt_val; break; \
+                case ORIG_RAX: UPT_ORIG_RAX(regs) = __upt_val; break; \
+                case CS: UPT_CS(regs) = __upt_val; break; \
+                case DS: UPT_DS(regs) = __upt_val; break; \
+                case ES: UPT_ES(regs) = __upt_val; break; \
+                case FS: UPT_FS(regs) = __upt_val; break; \
+                case GS: UPT_GS(regs) = __upt_val; break; \
+                case EFLAGS: UPT_EFLAGS(regs) = __upt_val; break; \
                 default :  \
                         panic("Bad register in UPT_SET : %d\n", reg);  \
                         break; \
@@ -241,24 +242,7 @@ struct syscall_args {
         CHOOSE_MODE(SC_SEGV_IS_FIXABLE(UPT_SC(r)), \
                     REGS_SEGV_IS_FIXABLE(&r->skas))
 
-#define UPT_FAULT_ADDR(r) \
-        __CHOOSE_MODE(SC_FAULT_ADDR(UPT_SC(r)), REGS_FAULT_ADDR(&r->skas))
-
-#define UPT_FAULT_WRITE(r) \
-        CHOOSE_MODE(SC_FAULT_WRITE(UPT_SC(r)), REGS_FAULT_WRITE(&r->skas))
-
-#define UPT_TRAP(r) __CHOOSE_MODE(SC_TRAP_TYPE(UPT_SC(r)), REGS_TRAP(&r->skas))
-#define UPT_ERR(r) __CHOOSE_MODE(SC_FAULT_TYPE(UPT_SC(r)), REGS_ERR(&r->skas))
+#define UPT_FAULTINFO(r) \
+        CHOOSE_MODE((&(r)->tt.faultinfo), (&(r)->skas.faultinfo))
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/include/sysdep-x86_64/sigcontext.h b/arch/um/include/sysdep-x86_64/sigcontext.h
index 1e38a54ff4cf..2a78260d15a0 100644
--- a/arch/um/include/sysdep-x86_64/sigcontext.h
+++ b/arch/um/include/sysdep-x86_64/sigcontext.h
@@ -17,11 +17,12 @@
 #define SC_FAULT_ADDR(sc) SC_CR2(sc)
 #define SC_FAULT_TYPE(sc) SC_ERR(sc)
 
-#define FAULT_WRITE(err) ((err) & 2)
-
-#define SC_FAULT_WRITE(sc) FAULT_WRITE(SC_FAULT_TYPE(sc))
-
-#define SC_TRAP_TYPE(sc) SC_TRAPNO(sc)
+#define GET_FAULTINFO_FROM_SC(fi,sc) \
+        { \
+                (fi).cr2 = SC_CR2(sc); \
+                (fi).error_code = SC_ERR(sc); \
+                (fi).trap_no = SC_TRAPNO(sc); \
+        }
 
 /* ptrace expects that, at the start of a system call, %eax contains
  * -ENOSYS, so this makes it so.
@@ -29,8 +30,8 @@
 
 #define SC_START_SYSCALL(sc) do SC_RAX(sc) = -ENOSYS; while(0)
 
-#define SEGV_IS_FIXABLE(trap) ((trap) == 14)
-#define SC_SEGV_IS_FIXABLE(sc) SEGV_IS_FIXABLE(SC_TRAP_TYPE(sc))
+/* This is Page Fault */
+#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
 
 extern unsigned long *sc_sigmask(void *sc_ptr);
 
diff --git a/arch/um/include/sysdep-x86_64/signal.h b/arch/um/include/sysdep-x86_64/signal.h
index e5e52756fab4..6142897af3d1 100644
--- a/arch/um/include/sysdep-x86_64/signal.h
+++ b/arch/um/include/sysdep-x86_64/signal.h
@@ -6,6 +6,8 @@
 #ifndef __X86_64_SIGNAL_H_
 #define __X86_64_SIGNAL_H_
 
+#define ARCH_SIGHDLR_PARAM int sig
+
 #define ARCH_GET_SIGCONTEXT(sc, sig_addr) \
         do { \
                 struct ucontext *__uc; \
diff --git a/arch/um/include/sysdep-x86_64/skas_ptrace.h b/arch/um/include/sysdep-x86_64/skas_ptrace.h
new file mode 100644
index 000000000000..95db4be786e4
--- /dev/null
+++ b/arch/um/include/sysdep-x86_64/skas_ptrace.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_SKAS_PTRACE_H
+#define __SYSDEP_X86_64_SKAS_PTRACE_H
+
+struct ptrace_faultinfo {
+        int is_write;
+        unsigned long addr;
+};
+
+struct ptrace_ldt {
+        int func;
+        void *ptr;
+        unsigned long bytecount;
+};
+
+#define PTRACE_LDT 54
+
+#endif
diff --git a/arch/um/include/sysrq.h b/arch/um/include/sysrq.h
index 2ce9423460b3..c8d332b56b98 100644
--- a/arch/um/include/sysrq.h
+++ b/arch/um/include/sysrq.h
@@ -1,6 +1,7 @@
 #ifndef __UM_SYSRQ_H
 #define __UM_SYSRQ_H
 
-extern void show_trace(unsigned long *stack);
+struct task_struct;
+extern void show_trace(struct task_struct* task, unsigned long *stack);
 
 #endif
diff --git a/arch/um/include/user_util.h b/arch/um/include/user_util.h
index 103cd320386c..7b6a24dfd302 100644
--- a/arch/um/include/user_util.h
+++ b/arch/um/include/user_util.h
@@ -41,9 +41,6 @@ extern unsigned long highmem;
 extern char host_info[];
 
 extern char saved_command_line[];
-extern char command_line[];
-
-extern char *tempdir;
 
 extern unsigned long _stext, _etext, _sdata, _edata, __bss_start, _end;
 extern unsigned long _unprotected_end;
@@ -67,7 +64,6 @@ extern void *um_kmalloc(int size);
 extern int switcheroo(int fd, int prot, void *from, void *to, int size);
 extern void setup_machinename(char *machine_out);
 extern void setup_hostinfo(void);
-extern void add_arg(char *arg);
 extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
 extern void init_new_thread_signals(int altstack);
 extern void do_exec(int old_pid, int new_pid);
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 246f0e7fb4cc..a8918e80df96 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -4,9 +4,9 @@
 #
 
 extra-y := vmlinux.lds
-clean-files := vmlinux.lds.S config.tmp
+clean-files :=
 
-obj-y = checksum.o config.o exec_kern.o exitcode.o \
+obj-y = config.o exec_kern.o exitcode.o \
         helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
         physmem.o process.o process_kern.o ptrace.o reboot.o resource.o \
         sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
@@ -14,7 +14,7 @@ obj-y = checksum.o config.o exec_kern.o exitcode.o \
         tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o umid.o \
         user_util.o
 
-obj-$(CONFIG_BLK_DEV_INITRD) += initrd_kern.o initrd_user.o
+obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
 obj-$(CONFIG_GPROF)     += gprof_syms.o
 obj-$(CONFIG_GCOV)      += gmon_syms.o
 obj-$(CONFIG_TTY_LOG)   += tty_log.o
@@ -23,18 +23,14 @@ obj-$(CONFIG_SYSCALL_DEBUG) += syscall_user.o
 obj-$(CONFIG_MODE_TT) += tt/
 obj-$(CONFIG_MODE_SKAS) += skas/
 
-# This needs be compiled with frame pointers regardless of how the rest of the
-# kernel is built.
-CFLAGS_frame.o := -fno-omit-frame-pointer
-
 user-objs-$(CONFIG_TTY_LOG) += tty_log.o
 
 USER_OBJS := $(user-objs-y) config.o helper.o main.o process.o tempfile.o \
-        time.o tty_log.o umid.o user_util.o frame.o
+        time.o tty_log.o umid.o user_util.o
 
 include arch/um/scripts/Makefile.rules
 
-targets += config.c
+targets := config.c config.tmp
 
 # Be careful with the below Sed code - sed is pitfall-rich!
 # We use sed to lower build requirements, for "embedded" builders for instance.
diff --git a/arch/um/kernel/checksum.c b/arch/um/kernel/checksum.c
deleted file mode 100644
index e69b2be951d1..000000000000
--- a/arch/um/kernel/checksum.c
+++ /dev/null
@@ -1,36 +0,0 @@
-#include "asm/uaccess.h"
-#include "linux/errno.h"
-#include "linux/module.h"
-
-unsigned int arch_csum_partial(const unsigned char *buff, int len, int sum);
-
-unsigned int csum_partial(unsigned char *buff, int len, int sum)
-{
-        return arch_csum_partial(buff, len, sum);
-}
-
-EXPORT_SYMBOL(csum_partial);
-
-unsigned int csum_partial_copy_to(const unsigned char *src,
-                                  unsigned char __user *dst, int len, int sum,
-                                  int *err_ptr)
-{
-        if(copy_to_user(dst, src, len)){
-                *err_ptr = -EFAULT;
-                return(-1);
-        }
-
-        return(arch_csum_partial(src, len, sum));
-}
-
-unsigned int csum_partial_copy_from(const unsigned char __user *src,
-                                    unsigned char *dst, int len, int sum,
-                                    int *err_ptr)
-{
-        if(copy_from_user(dst, src, len)){
-                *err_ptr = -EFAULT;
-                return(-1);
-        }
-
-        return arch_csum_partial(dst, len, sum);
-}
diff --git a/arch/um/kernel/exec_kern.c b/arch/um/kernel/exec_kern.c
index 49ddabe69be7..efd222ffe20e 100644
--- a/arch/um/kernel/exec_kern.c
+++ b/arch/um/kernel/exec_kern.c
@@ -16,7 +16,6 @@
 #include "kern.h"
 #include "irq_user.h"
 #include "tlb.h"
-#include "2_5compat.h"
 #include "os.h"
 #include "time_user.h"
 #include "choose-mode.h"
diff --git a/arch/um/kernel/initrd_kern.c b/arch/um/kernel/initrd.c
index fc568af468b9..82ecf904b09c 100644
--- a/arch/um/kernel/initrd_kern.c
+++ b/arch/um/kernel/initrd.c
@@ -41,12 +41,31 @@ static int __init uml_initrd_setup(char *line, int *add)
         return 0;
 }
 
-__uml_setup("initrd=", uml_initrd_setup, 
+__uml_setup("initrd=", uml_initrd_setup,
 "initrd=<initrd image>\n"
 "    This is used to boot UML from an initrd image.  The argument is the\n"
 "    name of the file containing the image.\n\n"
 );
 
+int load_initrd(char *filename, void *buf, int size)
+{
+        int fd, n;
+
+        fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
+        if(fd < 0){
+                printk("Opening '%s' failed - err = %d\n", filename, -fd);
+                return(-1);
+        }
+        n = os_read_file(fd, buf, size);
+        if(n != size){
+                printk("Read of %d bytes from '%s' failed, err = %d\n", size,
+                       filename, -n);
+                return(-1);
+        }
+
+        os_close_file(fd);
+        return(0);
+}
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically
diff --git a/arch/um/kernel/initrd_user.c b/arch/um/kernel/initrd_user.c
deleted file mode 100644
index cb90681e151c..000000000000
--- a/arch/um/kernel/initrd_user.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-
-#include "user_util.h"
-#include "kern_util.h"
-#include "user.h"
-#include "initrd.h"
-#include "os.h"
-
-int load_initrd(char *filename, void *buf, int size)
-{
-        int fd, n;
-
-        fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
-        if(fd < 0){
-                printk("Opening '%s' failed - err = %d\n", filename, -fd);
-                return(-1);
-        }
-        n = os_read_file(fd, buf, size);
-        if(n != size){
-                printk("Read of %d bytes from '%s' failed, err = %d\n", size,
-                       filename, -n);
-                return(-1);
-        }
-
-        os_close_file(fd);
-        return(0);
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index d71e8f00810f..d44fb5282547 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -163,7 +163,6 @@ void __init init_IRQ(void)
                 irq_desc[i].handler = &SIGIO_irq_type;
                 enable_irq(i);
         }
-        init_irq_signals(0);
 }
 
 /*
diff --git a/arch/um/kernel/irq_user.c b/arch/um/kernel/irq_user.c
index 6d6f9484b884..b3074cbaa479 100644
--- a/arch/um/kernel/irq_user.c
+++ b/arch/um/kernel/irq_user.c
@@ -236,9 +236,15 @@ static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
                                        (*prev)->fd, pollfds[i].fd);
                                 goto out;
                         }
-                        memcpy(&pollfds[i], &pollfds[i + 1],
-                               (pollfds_num - i - 1) * sizeof(pollfds[0]));
+
                         pollfds_num--;
+
+                        /* This moves the *whole* array after pollfds[i] (though
+                         * it doesn't spot as such)! */
+
+                        memmove(&pollfds[i], &pollfds[i + 1],
+                               (pollfds_num - i) * sizeof(pollfds[0]));
+
                         if(last_irq_ptr == &old_fd->next) 
                                 last_irq_ptr = prev;
                         *prev = (*prev)->next;
diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index b41d3397d07b..99439fa15ef4 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -10,7 +10,6 @@
 #include "linux/spinlock.h"
 #include "linux/highmem.h"
 #include "asm/current.h"
-#include "asm/delay.h"
 #include "asm/processor.h"
 #include "asm/unistd.h"
 #include "asm/pgalloc.h"
@@ -28,8 +27,6 @@ EXPORT_SYMBOL(uml_physmem);
 EXPORT_SYMBOL(set_signals);
 EXPORT_SYMBOL(get_signals);
 EXPORT_SYMBOL(kernel_thread);
-EXPORT_SYMBOL(__const_udelay);
-EXPORT_SYMBOL(__udelay);
 EXPORT_SYMBOL(sys_waitpid);
 EXPORT_SYMBOL(task_size);
 EXPORT_SYMBOL(flush_tlb_range);
@@ -60,6 +57,7 @@ EXPORT_SYMBOL(copy_to_user_tt);
 EXPORT_SYMBOL(strncpy_from_user_skas);
 EXPORT_SYMBOL(copy_to_user_skas);
 EXPORT_SYMBOL(copy_from_user_skas);
+EXPORT_SYMBOL(clear_user_skas);
 #endif
 EXPORT_SYMBOL(uml_strdup);
 
diff --git a/arch/um/kernel/main.c b/arch/um/kernel/main.c
index a17c49703f9b..e59f58152678 100644
--- a/arch/um/kernel/main.c
+++ b/arch/um/kernel/main.c
@@ -24,8 +24,6 @@
 #include "mode.h"
 #include "choose-mode.h"
 #include "uml-config.h"
-#include "irq_user.h"
-#include "time_user.h"
 #include "os.h"
 
 /* Set in set_stklim, which is called from main and __wrap_malloc.
@@ -71,7 +69,7 @@ static __init void do_uml_initcalls(void)
 
 static void last_ditch_exit(int sig)
 {
-        CHOOSE_MODE(kmalloc_ok = 0, (void) 0);
+        kmalloc_ok = 0;
         signal(SIGINT, SIG_DFL);
         signal(SIGTERM, SIG_DFL);
         signal(SIGHUP, SIG_DFL);
@@ -87,7 +85,7 @@ int main(int argc, char **argv, char **envp)
 {
         char **new_argv;
         sigset_t mask;
-        int ret, i;
+        int ret, i, err;
 
         /* Enable all signals except SIGIO - in some environments, we can
          * enter with some signals blocked
@@ -160,27 +158,29 @@ int main(int argc, char **argv, char **envp)
          */
         change_sig(SIGPROF, 0);
 
-        /* Reboot */
-        if(ret){
-                int err;
+        /* This signal stuff used to be in the reboot case.  However,
+         * sometimes a SIGVTALRM can come in when we're halting (reproducably
+         * when writing out gcov information, presumably because that takes
+         * some time) and cause a segfault.
+         */
 
-                printf("\n");
+        /* stop timers and set SIG*ALRM to be ignored */
+        disable_timer();
 
-                /* stop timers and set SIG*ALRM to be ignored */
-                disable_timer();
+        /* disable SIGIO for the fds and set SIGIO to be ignored */
+        err = deactivate_all_fds();
+        if(err)
+                printf("deactivate_all_fds failed, errno = %d\n", -err);
 
-                /* disable SIGIO for the fds and set SIGIO to be ignored */
-                err = deactivate_all_fds();
-                if(err)
-                        printf("deactivate_all_fds failed, errno = %d\n",
-                               -err);
-
-                /* Let any pending signals fire now.  This ensures
-                 * that they won't be delivered after the exec, when
-                 * they are definitely not expected.
-                 */
-                unblock_signals();
+        /* Let any pending signals fire now.  This ensures
+         * that they won't be delivered after the exec, when
+         * they are definitely not expected.
+         */
+        unblock_signals();
 
+        /* Reboot */
+        if(ret){
+                printf("\n");
                 execvp(new_argv[0], new_argv);
                 perror("Failed to exec kernel");
                 ret = 1;
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index f156661781cb..c22825f13e40 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -100,12 +100,37 @@ void mem_init(void)
 #endif
 }
 
+/*
+ * Create a page table and place a pointer to it in a middle page
+ * directory entry.
+ */
+static void __init one_page_table_init(pmd_t *pmd)
+{
+        if (pmd_none(*pmd)) {
+                pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+                set_pmd(pmd, __pmd(_KERNPG_TABLE +
+                                           (unsigned long) __pa(pte)));
+                if (pte != pte_offset_kernel(pmd, 0))
+                        BUG();
+        }
+}
+
+static void __init one_md_table_init(pud_t *pud)
+{
+#ifdef CONFIG_3_LEVEL_PGTABLES
+        pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+        set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
+        if (pmd_table != pmd_offset(pud, 0))
+                BUG();
+#endif
+}
+
 static void __init fixrange_init(unsigned long start, unsigned long end, 
                                  pgd_t *pgd_base)
 {
         pgd_t *pgd;
+        pud_t *pud;
         pmd_t *pmd;
-        pte_t *pte;
         int i, j;
         unsigned long vaddr;
 
@@ -115,15 +140,12 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
         pgd = pgd_base + i;
 
         for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
-                pmd = (pmd_t *)pgd;
+                pud = pud_offset(pgd, vaddr);
+                if (pud_none(*pud))
+                        one_md_table_init(pud);
+                pmd = pmd_offset(pud, vaddr);
                 for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
-                        if (pmd_none(*pmd)) {
-                                pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-                                set_pmd(pmd, __pmd(_KERNPG_TABLE + 
-                                                   (unsigned long) __pa(pte)));
-                                if (pte != pte_offset_kernel(pmd, 0))
-                                        BUG();
-                        }
+                        one_page_table_init(pmd);
                         vaddr += PMD_SIZE;
                 }
                 j = 0;
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index f76a2692adca..1b5ef3e96c71 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -30,7 +30,6 @@
 #include "init.h"
 #include "os.h"
 #include "uml-config.h"
-#include "ptrace_user.h"
 #include "choose-mode.h"
 #include "mode.h"
 #ifdef UML_CONFIG_MODE_SKAS
@@ -65,8 +64,6 @@ void init_new_thread_signals(int altstack)
                     SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
         set_handler(SIGBUS, (__sighandler_t) sig_handler, flags, 
                     SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
-        set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags, 
-                    SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
         set_handler(SIGUSR2, (__sighandler_t) sig_handler, 
                     flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
         signal(SIGHUP, SIG_IGN);
@@ -133,7 +130,7 @@ int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
         return(arg.pid);
 }
 
-static int ptrace_child(void *arg)
+static int ptrace_child(void)
 {
         int ret;
         int pid = os_getpid(), ppid = getppid();
@@ -162,20 +159,16 @@ static int ptrace_child(void *arg)
         _exit(ret);
 }
 
-static int start_ptraced_child(void **stack_out)
+static int start_ptraced_child(void)
 {
-        void *stack;
-        unsigned long sp;
         int pid, n, status;
         
-        stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
-                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-        if(stack == MAP_FAILED)
-                panic("check_ptrace : mmap failed, errno = %d", errno);
-        sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
-        pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
+        pid = fork();
+        if(pid == 0)
+                ptrace_child();
+
         if(pid < 0)
-                panic("check_ptrace : clone failed, errno = %d", errno);
+                panic("check_ptrace : fork failed, errno = %d", errno);
         CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
         if(n < 0)
                 panic("check_ptrace : wait failed, errno = %d", errno);
@@ -183,7 +176,6 @@ static int start_ptraced_child(void **stack_out)
                 panic("check_ptrace : expected SIGSTOP, got status = %d",
                       status);
 
-        *stack_out = stack;
         return(pid);
 }
 
@@ -191,12 +183,12 @@ static int start_ptraced_child(void **stack_out)
  * just avoid using sysemu, not panic, but only if SYSEMU features are broken.
  * So only for SYSEMU features we test mustpanic, while normal host features
  * must work anyway!*/
-static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
+static int stop_ptraced_child(int pid, int exitcode, int mustexit)
 {
         int status, n, ret = 0;
 
         if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
-                panic("check_ptrace : ptrace failed, errno = %d", errno);
+                panic("stop_ptraced_child : ptrace failed, errno = %d", errno);
         CATCH_EINTR(n = waitpid(pid, &status, 0));
         if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
                 int exit_with = WEXITSTATUS(status);
@@ -207,15 +199,13 @@ static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
                 printk("check_ptrace : child exited with exitcode %d, while "
                       "expecting %d; status 0x%x", exit_with,
                       exitcode, status);
-                if (mustpanic)
+                if (mustexit)
                         panic("\n");
                 else
                         printk("\n");
                 ret = -1;
         }
 
-        if(munmap(stack, PAGE_SIZE) < 0)
-                panic("check_ptrace : munmap failed, errno = %d", errno);
         return ret;
 }
 
@@ -237,12 +227,11 @@ __uml_setup("nosysemu", nosysemu_cmd_param,
 
 static void __init check_sysemu(void)
 {
-        void *stack;
         int pid, syscall, n, status, count=0;
 
         printk("Checking syscall emulation patch for ptrace...");
         sysemu_supported = 0;
-        pid = start_ptraced_child(&stack);
+        pid = start_ptraced_child();
 
         if(ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
                 goto fail;
@@ -260,7 +249,7 @@ static void __init check_sysemu(void)
                 panic("check_sysemu : failed to modify system "
                       "call return, errno = %d", errno);
 
-        if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+        if (stop_ptraced_child(pid, 0, 0) < 0)
                 goto fail_stopped;
 
         sysemu_supported = 1;
@@ -268,7 +257,7 @@ static void __init check_sysemu(void)
         set_using_sysemu(!force_sysemu_disabled);
 
         printk("Checking advanced syscall emulation patch for ptrace...");
-        pid = start_ptraced_child(&stack);
+        pid = start_ptraced_child();
         while(1){
                 count++;
                 if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
@@ -293,7 +282,7 @@ static void __init check_sysemu(void)
                         break;
                 }
         }
-        if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+        if (stop_ptraced_child(pid, 0, 0) < 0)
                 goto fail_stopped;
 
         sysemu_supported = 2;
@@ -304,18 +293,17 @@ static void __init check_sysemu(void)
         return;
 
 fail:
-        stop_ptraced_child(pid, stack, 1, 0);
+        stop_ptraced_child(pid, 1, 0);
 fail_stopped:
         printk("missing\n");
 }
 
 void __init check_ptrace(void)
 {
-        void *stack;
         int pid, syscall, n, status;
 
         printk("Checking that ptrace can change system call numbers...");
-        pid = start_ptraced_child(&stack);
+        pid = start_ptraced_child();
 
         if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
                 panic("check_ptrace: PTRACE_SETOPTIONS failed, errno = %d", errno);
@@ -342,7 +330,7 @@ void __init check_ptrace(void)
                         break;
                 }
         }
-        stop_ptraced_child(pid, stack, 0, 1);
+        stop_ptraced_child(pid, 0, 1);
         printk("OK\n");
         check_sysemu();
 }
@@ -374,11 +362,10 @@ void forward_pending_sigio(int target)
 static inline int check_skas3_ptrace_support(void)
 {
         struct ptrace_faultinfo fi;
-        void *stack;
         int pid, n, ret = 1;
 
         printf("Checking for the skas3 patch in the host...");
-        pid = start_ptraced_child(&stack);
+        pid = start_ptraced_child();
 
         n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
         if (n < 0) {
@@ -393,7 +380,7 @@ static inline int check_skas3_ptrace_support(void)
         }
 
         init_registers(pid);
-        stop_ptraced_child(pid, stack, 1, 1);
+        stop_ptraced_child(pid, 1, 1);
 
         return(ret);
 }
diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index 7a943696f950..804c6bbdf67c 100644
--- a/arch/um/kernel/process_kern.c
+++ b/arch/um/kernel/process_kern.c
@@ -43,7 +43,6 @@
 #include "tlb.h"
 #include "frame_kern.h"
 #include "sigcontext.h"
-#include "2_5compat.h"
 #include "os.h"
 #include "mode.h"
 #include "mode_kern.h"
@@ -55,18 +54,6 @@
  */
 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
 
-struct task_struct *get_task(int pid, int require)
-{
-        struct task_struct *ret;
-
-        read_lock(&tasklist_lock);
-        ret = find_task_by_pid(pid);
-        read_unlock(&tasklist_lock);
-
-        if(require && (ret == NULL)) panic("get_task couldn't find a task\n");
-        return(ret);
-}
-
 int external_pid(void *t)
 {
         struct task_struct *task = t ? t : current;
@@ -115,16 +102,6 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
         return(pid);
 }
 
-void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
-               struct task_struct *tsk)
-{
-        int cpu = smp_processor_id();
-
-        if (prev != next) 
-                cpu_clear(cpu, prev->cpu_vm_mask);
-        cpu_set(cpu, next->cpu_vm_mask);
-}
-
 void set_current(void *t)
 {
         struct task_struct *task = t;
@@ -152,7 +129,6 @@ void release_thread(struct task_struct *task)
  
 void exit_thread(void)
 {
-        CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
         unprotect_stack((unsigned long) current_thread);
 }
  
@@ -200,7 +176,6 @@ void default_idle(void)
 
         while(1){
                 /* endless idle loop with no priority at all */
-                SET_PRI(current);
 
                 /*
                  * although we are an idle CPU, we do not want to
@@ -223,11 +198,6 @@ int page_size(void)
         return(PAGE_SIZE);
 }
 
-unsigned long page_mask(void)
-{
-        return(PAGE_MASK);
-}
-
 void *um_virt_to_phys(struct task_struct *task, unsigned long addr, 
                       pte_t *pte_out)
 {
@@ -360,11 +330,6 @@ char *uml_strdup(char *string)
         return(new);
 }
 
-void *get_init_task(void)
-{
-        return(&init_thread_union.thread_info.task);
-}
-
 int copy_to_user_proc(void __user *to, void *from, int size)
 {
         return(copy_to_user(to, from, size));
@@ -476,21 +441,18 @@ int singlestepping(void * t)
         return 2;
 }
 
+/*
+ * Only x86 and x86_64 have an arch_align_stack().
+ * All other arches have "#define arch_align_stack(x) (x)"
+ * in their asm/system.h
+ * As this is included in UML from asm-um/system-generic.h,
+ * we can use it to behave as the subarch does.
+ */
+#ifndef arch_align_stack
 unsigned long arch_align_stack(unsigned long sp)
 {
         if (randomize_va_space)
                 sp -= get_random_int() % 8192;
         return sp & ~0xf;
 }
-
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+#endif
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index e50e60ff5d27..71af4d503899 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -19,15 +19,30 @@
 #include "skas_ptrace.h"
 #include "sysdep/ptrace.h"
 
+static inline void set_singlestepping(struct task_struct *child, int on)
+{
+        if (on)
+                child->ptrace |= PT_DTRACE;
+        else
+                child->ptrace &= ~PT_DTRACE;
+        child->thread.singlestep_syscall = 0;
+
+#ifdef SUBARCH_SET_SINGLESTEPPING
+        SUBARCH_SET_SINGLESTEPPING(child, on);
+#endif
+}
+
 /*
  * Called by kernel/ptrace.c when detaching..
  */
 void ptrace_disable(struct task_struct *child)
 { 
-        child->ptrace &= ~PT_DTRACE;
-        child->thread.singlestep_syscall = 0;
+        set_singlestepping(child,0);
 }
 
+extern int peek_user(struct task_struct * child, long addr, long data);
+extern int poke_user(struct task_struct * child, long addr, long data);
+
 long sys_ptrace(long request, long pid, long addr, long data)
 {
         struct task_struct *child;
@@ -67,6 +82,10 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 goto out_tsk;
         }
 
+#ifdef SUBACH_PTRACE_SPECIAL
+        SUBARCH_PTRACE_SPECIAL(child,request,addr,data);
+#endif
+
         ret = ptrace_check_attach(child, request == PTRACE_KILL);
         if (ret < 0)
                 goto out_tsk;
@@ -87,26 +106,9 @@ long sys_ptrace(long request, long pid, long addr, long data)
         }
 
         /* read the word at location addr in the USER area. */
-        case PTRACE_PEEKUSR: {
-                unsigned long tmp;
-
-                ret = -EIO;
-                if ((addr & 3) || addr < 0) 
-                        break;
-
-                tmp = 0;  /* Default return condition */
-                if(addr < MAX_REG_OFFSET){
-                        tmp = getreg(child, addr);
-                }
-                else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-                        (addr <= offsetof(struct user, u_debugreg[7]))){
-                        addr -= offsetof(struct user, u_debugreg[0]);
-                        addr = addr >> 2;
-                        tmp = child->thread.arch.debugregs[addr];
-                }
-                ret = put_user(tmp, (unsigned long __user *) data);
-                break;
-        }
+        case PTRACE_PEEKUSR:
+                ret = peek_user(child, addr, data);
+                break;
 
         /* when I and D space are separate, this will have to be fixed. */
         case PTRACE_POKETEXT: /* write the word at location addr. */
@@ -119,26 +121,8 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 break;
 
         case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
-                ret = -EIO;
-                if ((addr & 3) || addr < 0)
-                        break;
-
-                if (addr < MAX_REG_OFFSET) {
-                        ret = putreg(child, addr, data);
-                        break;
-                }
-#if 0 /* XXX x86_64 */
-                else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-                        (addr <= offsetof(struct user, u_debugreg[7]))){
-                          addr -= offsetof(struct user, u_debugreg[0]);
-                          addr = addr >> 2;
-                          if((addr == 4) || (addr == 5)) break;
-                          child->thread.arch.debugregs[addr] = data;
-                          ret = 0;
-                }
-#endif
-
-                break;
+                ret = poke_user(child, addr, data);
+                break;
 
         case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
         case PTRACE_CONT: { /* restart after signal. */
@@ -146,8 +130,7 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 if (!valid_signal(data))
                         break;
 
-                child->ptrace &= ~PT_DTRACE;
-                child->thread.singlestep_syscall = 0;
+                set_singlestepping(child, 0);
                 if (request == PTRACE_SYSCALL) {
                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
                 }
@@ -170,8 +153,7 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 if (child->exit_state == EXIT_ZOMBIE)   /* already dead */
                         break;
 
-                child->ptrace &= ~PT_DTRACE;
-                child->thread.singlestep_syscall = 0;
+                set_singlestepping(child, 0);
                 child->exit_code = SIGKILL;
                 wake_up_process(child);
                 break;
@@ -182,8 +164,7 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 if (!valid_signal(data))
                         break;
                 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-                child->ptrace |= PT_DTRACE;
-                child->thread.singlestep_syscall = 0;
+                set_singlestepping(child, 1);
                 child->exit_code = data;
                 /* give it a chance to run. */
                 wake_up_process(child);
@@ -250,23 +231,19 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 break;
 #endif
         case PTRACE_FAULTINFO: {
-                struct ptrace_faultinfo fault;
-
-                fault = ((struct ptrace_faultinfo) 
-                        { .is_write     = child->thread.err,
-                          .addr         = child->thread.cr2 });
-                ret = copy_to_user((unsigned long __user *) data, &fault,
-                                   sizeof(fault));
+                /* Take the info from thread->arch->faultinfo,
+                 * but transfer max. sizeof(struct ptrace_faultinfo).
+                 * On i386, ptrace_faultinfo is smaller!
+                 */
+                ret = copy_to_user((unsigned long __user *) data,
+                                   &child->thread.arch.faultinfo,
+                                   sizeof(struct ptrace_faultinfo));
                 if(ret)
                         break;
                 break;
         }
-        case PTRACE_SIGPENDING:
-                ret = copy_to_user((unsigned long __user *) data,
-                                   &child->pending.signal,
-                                   sizeof(child->pending.signal));
-                break;
 
+#ifdef PTRACE_LDT
         case PTRACE_LDT: {
                 struct ptrace_ldt ldt;
 
@@ -282,6 +259,7 @@ long sys_ptrace(long request, long pid, long addr, long data)
                 ret = -EIO;
                 break;
         }
+#endif
 #ifdef CONFIG_PROC_MM
         case PTRACE_SWITCH_MM: {
                 struct mm_struct *old = child->mm;
@@ -337,15 +315,16 @@ void syscall_trace(union uml_pt_regs *regs, int entryexit)
 
         if (unlikely(current->audit_context)) {
                 if (!entryexit)
-                        audit_syscall_entry(current, 
-                                            UPT_SYSCALL_NR(&regs->regs),
-                                            UPT_SYSCALL_ARG1(&regs->regs),
-                                            UPT_SYSCALL_ARG2(&regs->regs),
-                                            UPT_SYSCALL_ARG3(&regs->regs),
-                                            UPT_SYSCALL_ARG4(&regs->regs));
-                else
-                        audit_syscall_exit(current, 
-                                           UPT_SYSCALL_RET(&regs->regs));
+                        audit_syscall_entry(current,
+                                            HOST_AUDIT_ARCH,
+                                            UPT_SYSCALL_NR(regs),
+                                            UPT_SYSCALL_ARG1(regs),
+                                            UPT_SYSCALL_ARG2(regs),
+                                            UPT_SYSCALL_ARG3(regs),
+                                            UPT_SYSCALL_ARG4(regs));
+                else audit_syscall_exit(current,
+                                        AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
+                                        UPT_SYSCALL_RET(regs));
         }
 
         /* Fake a debug trap */
@@ -375,14 +354,3 @@ void syscall_trace(union uml_pt_regs *regs, int entryexit)
                 current->exit_code = 0;
         }
 }
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/kernel/sigio_user.c b/arch/um/kernel/sigio_user.c
index 668df13d8c9d..e89218958f38 100644
--- a/arch/um/kernel/sigio_user.c
+++ b/arch/um/kernel/sigio_user.c
@@ -182,6 +182,7 @@ static int write_sigio_thread(void *unused)
         int i, n, respond_fd;
         char c;
 
+        signal(SIGWINCH, SIG_IGN);
         fds = &current_poll;
         while(1){
                 n = poll(fds->poll, fds->used, -1);
diff --git a/arch/um/kernel/skas/include/mode_kern-skas.h b/arch/um/kernel/skas/include/mode_kern-skas.h
index 94c564962378..e48490028111 100644
--- a/arch/um/kernel/skas/include/mode_kern-skas.h
+++ b/arch/um/kernel/skas/include/mode_kern-skas.h
@@ -18,7 +18,6 @@ extern int copy_thread_skas(int nr, unsigned long clone_flags,
                             unsigned long sp, unsigned long stack_top,
                             struct task_struct *p, struct pt_regs *regs);
 extern void release_thread_skas(struct task_struct *task);
-extern void exit_thread_skas(void);
 extern void initial_thread_cb_skas(void (*proc)(void *), void *arg);
 extern void init_idle_skas(void);
 extern void flush_tlb_kernel_range_skas(unsigned long start,
diff --git a/arch/um/kernel/skas/include/skas.h b/arch/um/kernel/skas/include/skas.h
index f0702c2c7204..96b51dba3471 100644
--- a/arch/um/kernel/skas/include/skas.h
+++ b/arch/um/kernel/skas/include/skas.h
@@ -27,9 +27,10 @@ extern void map(int fd, unsigned long virt, unsigned long len, int r, int w,
 extern int unmap(int fd, void *addr, unsigned long len);
 extern int protect(int fd, unsigned long addr, unsigned long len, 
                    int r, int w, int x);
-extern void user_signal(int sig, union uml_pt_regs *regs);
+extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
 extern int new_mm(int from);
 extern void start_userspace(int cpu);
+extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
 extern long execute_syscall_skas(void *r);
 
 #endif
diff --git a/arch/um/kernel/skas/include/uaccess-skas.h b/arch/um/kernel/skas/include/uaccess-skas.h
index c35620385da0..cd6c280482cb 100644
--- a/arch/um/kernel/skas/include/uaccess-skas.h
+++ b/arch/um/kernel/skas/include/uaccess-skas.h
@@ -18,8 +18,8 @@
           ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
           ((unsigned long) (addr) + (size) >= (unsigned long)(addr))))
 
-static inline int __deprecated verify_area_skas(int type, const void * addr,
-                                   unsigned long size)
+static inline int verify_area_skas(int type, const void * addr,
+                                   unsigned long size)
 {
         return(access_ok_skas(type, addr, size) ? 0 : -EFAULT);
 }
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index b4ffaaa81241..773cd2b525fc 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -4,6 +4,7 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <signal.h>
@@ -27,27 +28,37 @@
 #include "chan_user.h"
 #include "signal_user.h"
 #include "registers.h"
+#include "process.h"
 
 int is_skas_winch(int pid, int fd, void *data)
 {
-        if(pid != os_getpid())
+        if(pid != os_getpgrp())
                 return(0);
 
         register_winch_irq(-1, fd, -1, data);
         return(1);
 }
 
-static void handle_segv(int pid)
+void get_skas_faultinfo(int pid, struct faultinfo * fi)
 {
-        struct ptrace_faultinfo fault;
         int err;
 
-        err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault);
+        err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
         if(err)
-                panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n",
-                      errno);
+                panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
+                      "errno = %d\n", errno);
+
+        /* Special handling for i386, which has different structs */
+        if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
+                memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
+                       sizeof(struct faultinfo) -
+                       sizeof(struct ptrace_faultinfo));
+}
 
-        segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
+static void handle_segv(int pid, union uml_pt_regs * regs)
+{
+        get_skas_faultinfo(pid, &regs->skas.faultinfo);
+        segv(regs->skas.faultinfo, 0, 1, NULL);
 }
 
 /*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
@@ -163,7 +174,7 @@ void userspace(union uml_pt_regs *regs)
                 if(WIFSTOPPED(status)){
                         switch(WSTOPSIG(status)){
                         case SIGSEGV:
-                                handle_segv(pid);
+                                handle_segv(pid, regs);
                                 break;
                         case SIGTRAP + 0x80:
                                 handle_trap(pid, regs, local_using_sysemu);
@@ -177,7 +188,7 @@ void userspace(union uml_pt_regs *regs)
                         case SIGBUS:
                         case SIGFPE:
                         case SIGWINCH:
-                                user_signal(WSTOPSIG(status), regs);
+                                user_signal(WSTOPSIG(status), regs, pid);
                                 break;
                         default:
                                 printk("userspace - child stopped with signal "
@@ -190,6 +201,11 @@ void userspace(union uml_pt_regs *regs)
                 }
         }
 }
+#define INIT_JMP_NEW_THREAD 0
+#define INIT_JMP_REMOVE_SIGSTACK 1
+#define INIT_JMP_CALLBACK 2
+#define INIT_JMP_HALT 3
+#define INIT_JMP_REBOOT 4
 
 void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
                 void (*handler)(int))
@@ -225,7 +241,7 @@ void thread_wait(void *sw, void *fb)
         *switch_buf = &buf;
         fork_buf = fb;
         if(sigsetjmp(buf, 1) == 0)
-                siglongjmp(*fork_buf, 1);
+                siglongjmp(*fork_buf, INIT_JMP_REMOVE_SIGSTACK);
 }
 
 void switch_threads(void *me, void *next)
@@ -249,23 +265,31 @@ int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
         sigjmp_buf **switch_buf = switch_buf_ptr;
         int n;
 
+        set_handler(SIGWINCH, (__sighandler_t) sig_handler,
+                    SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
+                    SIGVTALRM, -1);
+
         *fork_buf_ptr = &initial_jmpbuf;
         n = sigsetjmp(initial_jmpbuf, 1);
-        if(n == 0)
-                new_thread_proc((void *) stack, new_thread_handler);
-        else if(n == 1)
-                remove_sigstack();
-        else if(n == 2){
+        switch(n){
+        case INIT_JMP_NEW_THREAD:
+                new_thread_proc((void *) stack, new_thread_handler);
+                break;
+        case INIT_JMP_REMOVE_SIGSTACK:
+                remove_sigstack();
+                break;
+        case INIT_JMP_CALLBACK:
                 (*cb_proc)(cb_arg);
                 siglongjmp(*cb_back, 1);
-        }
-        else if(n == 3){
+                break;
+        case INIT_JMP_HALT:
                 kmalloc_ok = 0;
                 return(0);
-        }
-        else if(n == 4){
+        case INIT_JMP_REBOOT:
                 kmalloc_ok = 0;
                 return(1);
+        default:
+                panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
         }
         siglongjmp(**switch_buf, 1);
 }
@@ -290,7 +314,7 @@ void initial_thread_cb_skas(void (*proc)(void *), void *arg)
 
         block_signals();
         if(sigsetjmp(here, 1) == 0)
-                siglongjmp(initial_jmpbuf, 2);
+                siglongjmp(initial_jmpbuf, INIT_JMP_CALLBACK);
         unblock_signals();
 
         cb_proc = NULL;
@@ -301,13 +325,13 @@ void initial_thread_cb_skas(void (*proc)(void *), void *arg)
 void halt_skas(void)
 {
         block_signals();
-        siglongjmp(initial_jmpbuf, 3);
+        siglongjmp(initial_jmpbuf, INIT_JMP_HALT);
 }
 
 void reboot_skas(void)
 {
         block_signals();
-        siglongjmp(initial_jmpbuf, 4);
+        siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT);
 }
 
 void switch_mm_skas(int mm_fd)
diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
index 5d096ea63b97..fc71ef295782 100644
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -68,8 +68,11 @@ void new_thread_handler(int sig)
          * 0 if it just exits
          */
         n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
-        if(n == 1)
+        if(n == 1){
+                /* Handle any immediate reschedules or signals */
+                interrupt_end();
                 userspace(&current->thread.regs.regs);
+        }
         else do_exit(0);
 }
 
@@ -83,10 +86,6 @@ void release_thread_skas(struct task_struct *task)
 {
 }
 
-void exit_thread_skas(void)
-{
-}
-
 void fork_handler(int sig)
 {
         change_sig(SIGUSR1, 1);
@@ -100,6 +99,8 @@ void fork_handler(int sig)
         schedule_tail(current->thread.prev_sched);
         current->thread.prev_sched = NULL;
 
+        /* Handle any immediate reschedules or signals */
+        interrupt_end();
         userspace(&current->thread.regs.regs);
 }
 
diff --git a/arch/um/kernel/skas/trap_user.c b/arch/um/kernel/skas/trap_user.c
index 8e9b46d4702e..0dee1d95c806 100644
--- a/arch/um/kernel/skas/trap_user.c
+++ b/arch/um/kernel/skas/trap_user.c
@@ -5,12 +5,15 @@
 
 #include <signal.h>
 #include <errno.h>
-#include "sysdep/ptrace.h"
 #include "signal_user.h"
 #include "user_util.h"
 #include "kern_util.h"
 #include "task.h"
 #include "sigcontext.h"
+#include "skas.h"
+#include "ptrace_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/ptrace_user.h"
 
 void sig_handler_common_skas(int sig, void *sc_ptr)
 {
@@ -31,9 +34,11 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
         r = &TASK_REGS(get_current())->skas;
         save_user = r->is_user;
         r->is_user = 0;
-        r->fault_addr = SC_FAULT_ADDR(sc);
-        r->fault_type = SC_FAULT_TYPE(sc);
-        r->trap_type = SC_TRAP_TYPE(sc);
+        if ( sig == SIGFPE || sig == SIGSEGV ||
+             sig == SIGBUS || sig == SIGILL ||
+             sig == SIGTRAP ) {
+                GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
+        }
 
         change_sig(SIGUSR1, 1);
         info = &sig_info[sig];
@@ -45,14 +50,17 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
         r->is_user = save_user;
 }
 
-void user_signal(int sig, union uml_pt_regs *regs)
+extern int ptrace_faultinfo;
+
+void user_signal(int sig, union uml_pt_regs *regs, int pid)
 {
         struct signal_info *info;
+        int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
+                    (sig == SIGILL) || (sig == SIGTRAP));
 
         regs->skas.is_user = 1;
-        regs->skas.fault_addr = 0;
-        regs->skas.fault_type = 0;
-        regs->skas.trap_type = 0;
+        if (segv)
+                get_skas_faultinfo(pid, &regs->skas.faultinfo);
         info = &sig_info[sig];
         (*info->handler)(sig, regs);
 
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index f7da9d027672..75195281081e 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -29,9 +29,12 @@ static unsigned long maybe_map(unsigned long virt, int is_write)
         if(IS_ERR(phys) || (is_write && !pte_write(pte))){
                 err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
                 if(err)
-                        return(0);
+                        return(-1UL);
                 phys = um_virt_to_phys(current, virt, NULL);
         }
+        if(IS_ERR(phys))
+                phys = (void *) -1;
+
         return((unsigned long) phys);
 }
 
@@ -42,7 +45,7 @@ static int do_op(unsigned long addr, int len, int is_write,
         int n;
 
         addr = maybe_map(addr, is_write);
-        if(addr == -1)
+        if(addr == -1UL)
                 return(-1);
 
         page = phys_to_page(addr);
diff --git a/arch/um/kernel/skas/util/Makefile b/arch/um/kernel/skas/util/Makefile
index 17f5909d60f7..f7b7eba83340 100644
--- a/arch/um/kernel/skas/util/Makefile
+++ b/arch/um/kernel/skas/util/Makefile
@@ -2,3 +2,4 @@ hostprogs-y		:= mk_ptregs
 always                  := $(hostprogs-y)
 
 mk_ptregs-objs := mk_ptregs-$(SUBARCH).o
+HOSTCFLAGS_mk_ptregs-$(SUBARCH).o := -I$(objtree)/arch/um
diff --git a/arch/um/kernel/skas/util/mk_ptregs-i386.c b/arch/um/kernel/skas/util/mk_ptregs-i386.c
index 0788dd05bcac..1f96e1eeb8a7 100644
--- a/arch/um/kernel/skas/util/mk_ptregs-i386.c
+++ b/arch/um/kernel/skas/util/mk_ptregs-i386.c
@@ -1,8 +1,7 @@
 #include <stdio.h>
-#include <asm/ptrace.h>
-#include <asm/user.h>
+#include <user-offsets.h>
 
-#define PRINT_REG(name, val) printf("#define HOST_%s %d\n", (name), (val))
+#define SHOW(name) printf("#define %s %d\n", #name, name)
 
 int main(int argc, char **argv)
 {
@@ -12,28 +11,27 @@ int main(int argc, char **argv)
         printf("#ifndef __SKAS_PT_REGS_\n");
         printf("#define __SKAS_PT_REGS_\n");
         printf("\n");
-        printf("#define HOST_FRAME_SIZE %d\n", FRAME_SIZE);
-        printf("#define HOST_FP_SIZE %d\n",
-               sizeof(struct user_i387_struct) / sizeof(unsigned long));
-        printf("#define HOST_XFP_SIZE %d\n",
-               sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
+        SHOW(HOST_FRAME_SIZE);
+        SHOW(HOST_FP_SIZE);
+        SHOW(HOST_XFP_SIZE);
+
+        SHOW(HOST_IP);
+        SHOW(HOST_SP);
+        SHOW(HOST_EFLAGS);
+        SHOW(HOST_EAX);
+        SHOW(HOST_EBX);
+        SHOW(HOST_ECX);
+        SHOW(HOST_EDX);
+        SHOW(HOST_ESI);
+        SHOW(HOST_EDI);
+        SHOW(HOST_EBP);
+        SHOW(HOST_CS);
+        SHOW(HOST_SS);
+        SHOW(HOST_DS);
+        SHOW(HOST_FS);
+        SHOW(HOST_ES);
+        SHOW(HOST_GS);
 
-        PRINT_REG("IP", EIP);
-        PRINT_REG("SP", UESP);
-        PRINT_REG("EFLAGS", EFL);
-        PRINT_REG("EAX", EAX);
-        PRINT_REG("EBX", EBX);
-        PRINT_REG("ECX", ECX);
-        PRINT_REG("EDX", EDX);
-        PRINT_REG("ESI", ESI);
-        PRINT_REG("EDI", EDI);
-        PRINT_REG("EBP", EBP);
-        PRINT_REG("CS", CS);
-        PRINT_REG("SS", SS);
-        PRINT_REG("DS", DS);
-        PRINT_REG("FS", FS);
-        PRINT_REG("ES", ES);
-        PRINT_REG("GS", GS);
         printf("\n");
         printf("#endif\n");
         return(0);
diff --git a/arch/um/kernel/skas/util/mk_ptregs-x86_64.c b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
index 67aee92a70ef..5fccbfe35f78 100644
--- a/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
+++ b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
@@ -5,11 +5,10 @@
  */
 
 #include <stdio.h>
-#define __FRAME_OFFSETS
-#include <asm/ptrace.h>
+#include <user-offsets.h>
 
-#define PRINT_REG(name, val) \
-        printf("#define HOST_%s (%d / sizeof(unsigned long))\n", (name), (val))
+#define SHOW(name) \
+        printf("#define %s (%d / sizeof(unsigned long))\n", #name, name)
 
 int main(int argc, char **argv)
 {
@@ -18,36 +17,35 @@ int main(int argc, char **argv)
         printf("\n");
         printf("#ifndef __SKAS_PT_REGS_\n");
         printf("#define __SKAS_PT_REGS_\n");
-        printf("#define HOST_FRAME_SIZE (%d / sizeof(unsigned long))\n",
-               FRAME_SIZE);
-        PRINT_REG("RBX", RBX);
-        PRINT_REG("RCX", RCX);
-        PRINT_REG("RDI", RDI);
-        PRINT_REG("RSI", RSI);
-        PRINT_REG("RDX", RDX);
-        PRINT_REG("RBP", RBP);
-        PRINT_REG("RAX", RAX);
-        PRINT_REG("R8", R8);
-        PRINT_REG("R9", R9);
-        PRINT_REG("R10", R10);
-        PRINT_REG("R11", R11);
-        PRINT_REG("R12", R12);
-        PRINT_REG("R13", R13);
-        PRINT_REG("R14", R14);
-        PRINT_REG("R15", R15);
-        PRINT_REG("ORIG_RAX", ORIG_RAX);
-        PRINT_REG("CS", CS);
-        PRINT_REG("SS", SS);
-        PRINT_REG("EFLAGS", EFLAGS);
+        SHOW(HOST_FRAME_SIZE);
+        SHOW(HOST_RBX);
+        SHOW(HOST_RCX);
+        SHOW(HOST_RDI);
+        SHOW(HOST_RSI);
+        SHOW(HOST_RDX);
+        SHOW(HOST_RBP);
+        SHOW(HOST_RAX);
+        SHOW(HOST_R8);
+        SHOW(HOST_R9);
+        SHOW(HOST_R10);
+        SHOW(HOST_R11);
+        SHOW(HOST_R12);
+        SHOW(HOST_R13);
+        SHOW(HOST_R14);
+        SHOW(HOST_R15);
+        SHOW(HOST_ORIG_RAX);
+        SHOW(HOST_CS);
+        SHOW(HOST_SS);
+        SHOW(HOST_EFLAGS);
 #if 0
-        PRINT_REG("FS", FS);
-        PRINT_REG("GS", GS);
-        PRINT_REG("DS", DS);
-        PRINT_REG("ES", ES);
+        SHOW(HOST_FS);
+        SHOW(HOST_GS);
+        SHOW(HOST_DS);
+        SHOW(HOST_ES);
 #endif
 
-        PRINT_REG("IP", RIP);
-        PRINT_REG("SP", RSP);
+        SHOW(HOST_IP);
+        SHOW(HOST_SP);
         printf("#define HOST_FP_SIZE 0\n");
         printf("#define HOST_XFP_SIZE 0\n");
         printf("\n");
diff --git a/arch/um/kernel/syscall_kern.c b/arch/um/kernel/syscall_kern.c
index 42731e04f50f..b7a55251e897 100644
--- a/arch/um/kernel/syscall_kern.c
+++ b/arch/um/kernel/syscall_kern.c
@@ -17,7 +17,6 @@
 #include "linux/utime.h"
 #include "asm/mman.h"
 #include "asm/uaccess.h"
-#include "asm/ipc.h"
 #include "kern_util.h"
 #include "user_util.h"
 #include "sysdep/syscalls.h"
diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index e630438f9e73..f80850091e79 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -3,6 +3,7 @@
  * Licensed under the GPL
  */
 
+#include "linux/config.h"
 #include "linux/sched.h"
 #include "linux/kernel.h"
 #include "linux/module.h"
@@ -12,14 +13,14 @@
 #include "sysrq.h"
 #include "user_util.h"
 
-void show_trace(unsigned long * stack)
+/* Catch non-i386 SUBARCH's. */
+#if !defined(CONFIG_UML_X86) || defined(CONFIG_64BIT)
+void show_trace(struct task_struct *task, unsigned long * stack)
 {
-        /* XXX: Copy the CONFIG_FRAME_POINTER stack-walking backtrace from
-         * arch/i386/kernel/traps.c, and then move this to sys-i386/sysrq.c.*/
         unsigned long addr;
 
         if (!stack) {
-                stack = (unsigned long*) &stack;
+                stack = (unsigned long*) &stack;
                 WARN_ON(1);
         }
 
@@ -35,6 +36,7 @@ void show_trace(unsigned long * stack)
         }
         printk("\n");
 }
+#endif
 
 /*
  * stack dumps generator - this is used by arch-independent code.
@@ -44,7 +46,7 @@ void dump_stack(void)
 {
         unsigned long stack;
 
-        show_trace(&stack);
+        show_trace(current, &stack);
 }
 EXPORT_SYMBOL(dump_stack);
 
@@ -59,7 +61,11 @@ void show_stack(struct task_struct *task, unsigned long *esp)
         int i;
 
         if (esp == NULL) {
-                if (task != current) {
+                if (task != current && task != NULL) {
+                        /* XXX: Isn't this bogus? I.e. isn't this the
+                         * *userspace* stack of this task? If not so, use this
+                         * even when task == current (as in i386).
+                         */
                         esp = (unsigned long *) KSTK_ESP(task);
                         /* Which one? No actual difference - just coding style.*/
                         //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
@@ -77,5 +83,6 @@ void show_stack(struct task_struct *task, unsigned long *esp)
                 printk("%08lx ", *stack++);
         }
 
-        show_trace(esp);
+        printk("Call Trace: \n");
+        show_trace(current, esp);
 }
diff --git a/arch/um/kernel/time_kern.c b/arch/um/kernel/time_kern.c
index 2461cd73ca87..6516fc52afe0 100644
--- a/arch/um/kernel/time_kern.c
+++ b/arch/um/kernel/time_kern.c
@@ -48,8 +48,6 @@ static unsigned long long prev_usecs;
 static long long delta;                 /* Deviation per interval */
 #endif
 
-#define MILLION 1000000
-
 void timer_irq(union uml_pt_regs *regs)
 {
         unsigned long long ticks = 0;
@@ -136,22 +134,6 @@ long um_stime(int __user *tptr)
         return 0;
 }
 
-void __udelay(unsigned long usecs)
-{
-        int i, n;
-
-        n = (loops_per_jiffy * HZ * usecs) / MILLION;
-        for(i=0;i<n;i++) ;
-}
-
-void __const_udelay(unsigned long usecs)
-{
-        int i, n;
-
-        n = (loops_per_jiffy * HZ * usecs) / MILLION;
-        for(i=0;i<n;i++) ;
-}
-
 void timer_handler(int sig, union uml_pt_regs *regs)
 {
         local_irq_disable();
diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
index 47e766e6ba10..c20aef120598 100644
--- a/arch/um/kernel/trap_kern.c
+++ b/arch/um/kernel/trap_kern.c
@@ -23,7 +23,6 @@
 #include "kern.h"
 #include "chan_kern.h"
 #include "mconsole_kern.h"
-#include "2_5compat.h"
 #include "mem.h"
 #include "mem_kern.h"
 
@@ -48,7 +47,7 @@ int handle_page_fault(unsigned long address, unsigned long ip,
                 goto good_area;
         else if(!(vma->vm_flags & VM_GROWSDOWN)) 
                 goto out;
-        else if(!ARCH_IS_STACKGROW(address))
+        else if(is_user && !ARCH_IS_STACKGROW(address))
                 goto out;
         else if(expand_stack(vma, address)) 
                 goto out;
@@ -57,10 +56,11 @@ int handle_page_fault(unsigned long address, unsigned long ip,
         *code_out = SEGV_ACCERR;
         if(is_write && !(vma->vm_flags & VM_WRITE)) 
                 goto out;
+
+        if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+                goto out;
+
         page = address & PAGE_MASK;
-        pgd = pgd_offset(mm, page);
-        pud = pud_offset(pgd, page);
-        pmd = pmd_offset(pud, page);
         do {
  survive:
                 switch (handle_mm_fault(mm, vma, address, is_write)){
@@ -106,46 +106,24 @@ out_of_memory:
         goto out;
 }
 
-LIST_HEAD(physmem_remappers);
-
-void register_remapper(struct remapper *info)
-{
-        list_add(&info->list, &physmem_remappers);
-}
-
-static int check_remapped_addr(unsigned long address, int is_write)
-{
-        struct remapper *remapper;
-        struct list_head *ele;
-        __u64 offset;
-        int fd;
-
-        fd = phys_mapping(__pa(address), &offset);
-        if(fd == -1)
-                return(0);
-
-        list_for_each(ele, &physmem_remappers){
-                remapper = list_entry(ele, struct remapper, list);
-                if((*remapper->proc)(fd, address, is_write, offset))
-                        return(1);
-        }
-
-        return(0);
-}
-
-unsigned long segv(unsigned long address, unsigned long ip, int is_write, 
-                   int is_user, void *sc)
+/*
+ * We give a *copy* of the faultinfo in the regs to segv.
+ * This must be done, since nesting SEGVs could overwrite
+ * the info in the regs. A pointer to the info then would
+ * give us bad data!
+ */
+unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc)
 {
         struct siginfo si;
         void *catcher;
         int err;
+        int is_write = FAULT_WRITE(fi);
+        unsigned long address = FAULT_ADDRESS(fi);
 
         if(!is_user && (address >= start_vm) && (address < end_vm)){
                 flush_tlb_kernel_vm();
                 return(0);
         }
-        else if(check_remapped_addr(address & PAGE_MASK, is_write))
-                return(0);
         else if(current->mm == NULL)
                 panic("Segfault with no mm");
         err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
@@ -159,7 +137,7 @@ unsigned long segv(unsigned long address, unsigned long ip, int is_write,
         } 
         else if(current->thread.fault_addr != NULL)
                 panic("fault_addr set but no fault catcher");
-        else if(arch_fixup(ip, sc))
+        else if(!is_user && arch_fixup(ip, sc))
                 return(0);
 
         if(!is_user) 
@@ -171,6 +149,7 @@ unsigned long segv(unsigned long address, unsigned long ip, int is_write,
                 si.si_errno = 0;
                 si.si_code = BUS_ADRERR;
                 si.si_addr = (void *)address;
+                current->thread.arch.faultinfo = fi;
                 force_sig_info(SIGBUS, &si, current);
         }
         else if(err == -ENOMEM){
@@ -180,22 +159,20 @@ unsigned long segv(unsigned long address, unsigned long ip, int is_write,
         else {
                 si.si_signo = SIGSEGV;
                 si.si_addr = (void *) address;
-                current->thread.cr2 = address;
-                current->thread.err = is_write;
+                current->thread.arch.faultinfo = fi;
                 force_sig_info(SIGSEGV, &si, current);
         }
         return(0);
 }
 
-void bad_segv(unsigned long address, unsigned long ip, int is_write)
+void bad_segv(struct faultinfo fi, unsigned long ip)
 {
         struct siginfo si;
 
         si.si_signo = SIGSEGV;
         si.si_code = SEGV_ACCERR;
-        si.si_addr = (void *) address;
-        current->thread.cr2 = address;
-        current->thread.err = is_write;
+        si.si_addr = (void *) FAULT_ADDRESS(fi);
+        current->thread.arch.faultinfo = fi;
         force_sig_info(SIGSEGV, &si, current);
 }
 
@@ -204,6 +181,7 @@ void relay_signal(int sig, union uml_pt_regs *regs)
         if(arch_handle_signal(sig, regs)) return;
         if(!UPT_IS_USER(regs))
                 panic("Kernel mode signal %d", sig);
+        current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
         force_sig(sig, current);
 }
 
diff --git a/arch/um/kernel/trap_user.c b/arch/um/kernel/trap_user.c
index 50a4042a509f..f825a6eda3f5 100644
--- a/arch/um/kernel/trap_user.c
+++ b/arch/um/kernel/trap_user.c
@@ -54,23 +54,22 @@ struct {
 void segv_handler(int sig, union uml_pt_regs *regs)
 {
         int index, max;
+        struct faultinfo * fi = UPT_FAULTINFO(regs);
 
-        if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
-                bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), 
-                         UPT_FAULT_WRITE(regs));
+        if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
+                bad_segv(*fi, UPT_IP(regs));
                 return;
         }
         max = sizeof(segfault_record)/sizeof(segfault_record[0]);
         index = next_trap_index(max);
 
         nsegfaults++;
-        segfault_record[index].address = UPT_FAULT_ADDR(regs);
+        segfault_record[index].address = FAULT_ADDRESS(*fi);
         segfault_record[index].pid = os_getpid();
-        segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
+        segfault_record[index].is_write = FAULT_WRITE(*fi);
         segfault_record[index].sp = UPT_SP(regs);
         segfault_record[index].is_user = UPT_IS_USER(regs);
-        segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
-             UPT_IS_USER(regs), regs);
+        segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
 }
 
 void usr2_handler(int sig, union uml_pt_regs *regs)
diff --git a/arch/um/kernel/tt/Makefile b/arch/um/kernel/tt/Makefile
index 3d5177df3504..c3faea21a996 100644
--- a/arch/um/kernel/tt/Makefile
+++ b/arch/um/kernel/tt/Makefile
@@ -4,6 +4,7 @@
 #
 
 extra-y := unmap_fin.o
+targets := unmap.o
 clean-files := unmap_tmp.o
 
 obj-y = exec_kern.o exec_user.o gdb.o ksyms.o mem.o mem_user.o process_kern.o \
diff --git a/arch/um/kernel/tt/include/mode_kern-tt.h b/arch/um/kernel/tt/include/mode_kern-tt.h
index 28aaab3448fa..e0ca0e0b2516 100644
--- a/arch/um/kernel/tt/include/mode_kern-tt.h
+++ b/arch/um/kernel/tt/include/mode_kern-tt.h
@@ -19,7 +19,6 @@ extern int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
                           unsigned long stack_top, struct task_struct *p,
                           struct pt_regs *regs);
 extern void release_thread_tt(struct task_struct *task);
-extern void exit_thread_tt(void);
 extern void initial_thread_cb_tt(void (*proc)(void *), void *arg);
 extern void init_idle_tt(void);
 extern void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end);
diff --git a/arch/um/kernel/tt/include/uaccess-tt.h b/arch/um/kernel/tt/include/uaccess-tt.h
index bb69d6b7d022..3fbb5fe26f49 100644
--- a/arch/um/kernel/tt/include/uaccess-tt.h
+++ b/arch/um/kernel/tt/include/uaccess-tt.h
@@ -33,8 +33,8 @@ extern unsigned long uml_physmem;
          (((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) && \
           (under_task_size(addr, size) || is_stack(addr, size))))
 
-static inline int __deprecated verify_area_tt(int type, const void * addr,
-                                 unsigned long size)
+static inline int verify_area_tt(int type, const void * addr,
+                                 unsigned long size)
 {
         return(access_ok_tt(type, addr, size) ? 0 : -EFAULT);
 }
diff --git a/arch/um/kernel/tt/ksyms.c b/arch/um/kernel/tt/ksyms.c
index 92ec85d67c7c..84a9385a8fef 100644
--- a/arch/um/kernel/tt/ksyms.c
+++ b/arch/um/kernel/tt/ksyms.c
@@ -12,6 +12,7 @@ EXPORT_SYMBOL(__do_copy_to_user);
 EXPORT_SYMBOL(__do_strncpy_from_user);
 EXPORT_SYMBOL(__do_strnlen_user); 
 EXPORT_SYMBOL(__do_clear_user);
+EXPORT_SYMBOL(clear_user_tt);
 
 EXPORT_SYMBOL(tracing_pid);
 EXPORT_SYMBOL(honeypot);
diff --git a/arch/um/kernel/tt/mem.c b/arch/um/kernel/tt/mem.c
index 74346a04a2b2..bcb8796c3cb1 100644
--- a/arch/um/kernel/tt/mem.c
+++ b/arch/um/kernel/tt/mem.c
@@ -21,14 +21,8 @@ void before_mem_tt(unsigned long brk_start)
         remap_data(UML_ROUND_DOWN(&__bss_start), UML_ROUND_UP(&_end), 1);
 }
 
-#ifdef CONFIG_HOST_2G_2G
-#define TOP 0x80000000
-#else
-#define TOP 0xc0000000
-#endif
-
 #define SIZE ((CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS) * 0x20000000)
-#define START (TOP - SIZE)
+#define START (CONFIG_TOP_ADDR - SIZE)
 
 unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out, 
                                 unsigned long *task_size_out)
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
index f19f7c18febe..776310fd5b8b 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -32,10 +32,6 @@ void *switch_to_tt(void *prev, void *next, void *last)
         unsigned long flags;
         int err, vtalrm, alrm, prof, cpu;
         char c;
-        /* jailing and SMP are incompatible, so this doesn't need to be 
-         * made per-cpu 
-         */
-        static int reading;
 
         from = prev;
         to = next;
@@ -59,14 +55,11 @@ void *switch_to_tt(void *prev, void *next, void *last)
         c = 0;
         set_current(to);
 
-        reading = 0;
         err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
         if(err != sizeof(c))
                 panic("write of switch_pipe failed, err = %d", -err);
 
-        reading = 1;
-        if((from->exit_state == EXIT_ZOMBIE) ||
-           (from->exit_state == EXIT_DEAD))
+        if(from->thread.mode.tt.switch_pipe[0] == -1)
                 os_kill_process(os_getpid(), 0);
 
         err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
@@ -81,8 +74,7 @@ void *switch_to_tt(void *prev, void *next, void *last)
          * in case it has not already killed itself.
          */
         prev_sched = current->thread.prev_sched;
-        if((prev_sched->exit_state == EXIT_ZOMBIE) ||
-           (prev_sched->exit_state == EXIT_DEAD))
+        if(prev_sched->thread.mode.tt.switch_pipe[0] == -1)
                 os_kill_process(prev_sched->thread.mode.tt.extern_pid, 1);
 
         change_sig(SIGVTALRM, vtalrm);
@@ -101,14 +93,18 @@ void release_thread_tt(struct task_struct *task)
 {
         int pid = task->thread.mode.tt.extern_pid;
 
+        /*
+         * We first have to kill the other process, before
+         * closing its switch_pipe. Else it might wake up
+         * and receive "EOF" before we could kill it.
+         */
         if(os_getpid() != pid)
                 os_kill_process(pid, 0);
-}
 
-void exit_thread_tt(void)
-{
-        os_close_file(current->thread.mode.tt.switch_pipe[0]);
-        os_close_file(current->thread.mode.tt.switch_pipe[1]);
+        os_close_file(task->thread.mode.tt.switch_pipe[0]);
+        os_close_file(task->thread.mode.tt.switch_pipe[1]);
+        /* use switch_pipe as flag: thread is released */
+        task->thread.mode.tt.switch_pipe[0] = -1;
 }
 
 void suspend_new_thread(int fd)
diff --git a/arch/um/kernel/tt/syscall_user.c b/arch/um/kernel/tt/syscall_user.c
index e4e7e9c2224c..b218316cfdb2 100644
--- a/arch/um/kernel/tt/syscall_user.c
+++ b/arch/um/kernel/tt/syscall_user.c
@@ -63,6 +63,10 @@ void do_syscall(void *task, int pid, int local_using_sysemu)
 
         UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
 
+#ifdef UPT_ORIGGPR2
+        UPT_ORIGGPR2(TASK_REGS(task)) = REGS_ORIGGPR2(proc_regs);
+#endif
+
         if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
            ((unsigned long *) PT_IP(proc_regs) <= &_etext))
                 tracer_panic("I'm tracing myself and I can't get out");
diff --git a/arch/um/kernel/tt/tracer.c b/arch/um/kernel/tt/tracer.c
index 7b5d937e5955..d11e7399d7a1 100644
--- a/arch/um/kernel/tt/tracer.c
+++ b/arch/um/kernel/tt/tracer.c
@@ -26,6 +26,7 @@
 #include "kern_util.h"
 #include "chan_user.h"
 #include "ptrace_user.h"
+#include "irq_user.h"
 #include "mode.h"
 #include "tt.h"
 
@@ -33,7 +34,7 @@ static int tracer_winch[2];
 
 int is_tracer_winch(int pid, int fd, void *data)
 {
-        if(pid != tracing_pid)
+        if(pid != os_getpgrp())
                 return(0);
 
         register_winch_irq(tracer_winch[0], fd, -1, data);
@@ -89,8 +90,10 @@ void tracer_panic(char *format, ...)
 
 static void tracer_segv(int sig, struct sigcontext sc)
 {
+        struct faultinfo fi;
+        GET_FAULTINFO_FROM_SC(fi, &sc);
         printf("Tracing thread segfault at address 0x%lx, ip 0x%lx\n",
-               SC_FAULT_ADDR(&sc), SC_IP(&sc));
+               FAULT_ADDRESS(fi), SC_IP(&sc));
         while(1)
                 pause();
 }
@@ -117,6 +120,7 @@ static int signal_tramp(void *arg)
         signal(SIGSEGV, (__sighandler_t) sig_handler);
         set_cmdline("(idle thread)");
         set_init_pid(os_getpid());
+        init_irq_signals(0);
         proc = arg;
         return((*proc)(NULL));
 }
diff --git a/arch/um/kernel/tt/trap_user.c b/arch/um/kernel/tt/trap_user.c
index 92a3820ca543..fc108615beaf 100644
--- a/arch/um/kernel/tt/trap_user.c
+++ b/arch/um/kernel/tt/trap_user.c
@@ -7,6 +7,7 @@
 #include <errno.h>
 #include <signal.h>
 #include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
 #include "signal_user.h"
 #include "user_util.h"
 #include "kern_util.h"
@@ -28,6 +29,11 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
                 change_sig(SIGSEGV, 1);
 
         r = &TASK_REGS(get_current())->tt;
+        if ( sig == SIGFPE || sig == SIGSEGV ||
+             sig == SIGBUS || sig == SIGILL ||
+             sig == SIGTRAP ) {
+                GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
+        }
         save_regs = *r;
         is_user = user_context(SC_SP(sc));
         r->sc = sc;
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 5c49d88eed3d..8736d098f0ee 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -23,9 +23,9 @@
 #include "asm/ptrace.h"
 #include "asm/elf.h"
 #include "asm/user.h"
+#include "asm/setup.h"
 #include "ubd_user.h"
 #include "asm/current.h"
-#include "asm/setup.h"
 #include "user_util.h"
 #include "kern_util.h"
 #include "kern.h"
@@ -42,9 +42,9 @@
 #define DEFAULT_COMMAND_LINE "root=98:0"
 
 /* Changed in linux_main and setup_arch, which run before SMP is started */
-char command_line[COMMAND_LINE_SIZE] = { 0 };
+static char command_line[COMMAND_LINE_SIZE] = { 0 };
 
-void add_arg(char *arg)
+static void add_arg(char *arg)
 {
         if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
                 printf("add_arg: Too many command line arguments!\n");
@@ -110,12 +110,6 @@ struct seq_operations cpuinfo_op = {
         .show   = show_cpuinfo,
 };
 
-pte_t * __bad_pagetable(void)
-{
-        panic("Someone should implement __bad_pagetable");
-        return(NULL);
-}
-
 /* Set in linux_main */
 unsigned long host_task_size;
 unsigned long task_size;
@@ -449,7 +443,7 @@ void __init setup_arch(char **cmdline_p)
 {
         notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
         paging_init();
-        strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+        strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
         *cmdline_p = command_line;
         setup_hostinfo();
 }
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index 76eadb309189..dd5355500bdc 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -73,6 +73,8 @@ SECTIONS
 
   .got           : { *(.got.plt) *(.got) }
   .dynamic       : { *(.dynamic) }
+  .tdata          : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+  .tbss           : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
   /* We want the small data sections together, so single-instruction offsets
      can access them all, and initialized data all before uninitialized, so
      we can shorten the on-disk segment size.  */
diff --git a/arch/um/kernel/vmlinux.lds.S b/arch/um/kernel/vmlinux.lds.S
new file mode 100644
index 000000000000..1660a769674b
--- /dev/null
+++ b/arch/um/kernel/vmlinux.lds.S
@@ -0,0 +1,6 @@
+#include <linux/config.h>
+#ifdef CONFIG_LD_SCRIPT_STATIC
+#include "uml.lds.S"
+#else
+#include "dyn.lds.S"
+#endif
diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c
index 9aee0b62ebca..f0d6060e3e57 100644
--- a/arch/um/os-Linux/elf_aux.c
+++ b/arch/um/os-Linux/elf_aux.c
@@ -45,7 +45,11 @@ __init void scan_elf_aux( char **envp)
                                 elf_aux_hwcap = auxv->a_un.a_val;
                                 break;
                         case AT_PLATFORM:
-                                elf_aux_platform = auxv->a_un.a_ptr;
+                                /* elf.h removed the pointer elements from
+                                 * a_un, so we have to use a_val, which is
+                                 * all that's left.
+                                 */
+                                elf_aux_platform = (char *) auxv->a_un.a_val;
                                 break;
                         case AT_PAGESZ:
                                 page_size = auxv->a_un.a_val;
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 77d4066d1af8..fd45bb260907 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -363,7 +363,7 @@ int os_write_file(int fd, const void *buf, int len)
                        (int (*)(int, void *, int)) write, copy_to_user_proc));
 }
 
-int os_file_size(char *file, long long *size_out)
+int os_file_size(char *file, unsigned long long *size_out)
 {
         struct uml_stat buf;
         int err;
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index ba9ca1cc790a..1e126bfd31a7 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -123,6 +123,11 @@ int os_getpid(void)
         return(getpid());
 }
 
+int os_getpgrp(void)
+{
+        return getpgrp();
+}
+
 int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
                   int r, int w, int x)
 {
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 7eac1baf5975..c7bfd5ee3925 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -8,7 +8,7 @@
 #include "mode.h"
 #include "sysdep/signal.h"
 
-void sig_handler(int sig)
+void sig_handler(ARCH_SIGHDLR_PARAM)
 {
         struct sigcontext *sc;
 
@@ -19,7 +19,7 @@ void sig_handler(int sig)
 
 extern int timer_irq_inited;
 
-void alarm_handler(int sig)
+void alarm_handler(ARCH_SIGHDLR_PARAM)
 {
         struct sigcontext *sc;
 
diff --git a/arch/um/os-Linux/util/Makefile b/arch/um/os-Linux/util/Makefile
index fb00ddf969bd..9778aed0c314 100644
--- a/arch/um/os-Linux/util/Makefile
+++ b/arch/um/os-Linux/util/Makefile
@@ -1,4 +1,4 @@
 hostprogs-y             := mk_user_constants
 always                  := $(hostprogs-y)
 
-mk_user_constants-objs  := mk_user_constants.o
+HOSTCFLAGS_mk_user_constants.o := -I$(objtree)/arch/um
diff --git a/arch/um/os-Linux/util/mk_user_constants.c b/arch/um/os-Linux/util/mk_user_constants.c
index 0933518aa8bd..4838f30eecf0 100644
--- a/arch/um/os-Linux/util/mk_user_constants.c
+++ b/arch/um/os-Linux/util/mk_user_constants.c
@@ -1,11 +1,5 @@
 #include <stdio.h>
-#include <asm/types.h>
-/* For some reason, x86_64 nowhere defines u64 and u32, even though they're
- * used throughout the headers.
- */
-typedef __u64 u64;
-typedef __u32 u32;
-#include <asm/user.h>
+#include <user-offsets.h>
 
 int main(int argc, char **argv)
 {
@@ -20,7 +14,7 @@ int main(int argc, char **argv)
    * x86_64 (216 vs 168 bytes).  user_regs_struct is the correct size on
    * both x86_64 and i386.
    */
-  printf("#define UM_FRAME_SIZE %d\n", (int) sizeof(struct user_regs_struct));
+  printf("#define UM_FRAME_SIZE %d\n", __UM_FRAME_SIZE);
 
   printf("\n");
   printf("#endif\n");
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
index 143f6fea0763..98346c711493 100644
--- a/arch/um/scripts/Makefile.rules
+++ b/arch/um/scripts/Makefile.rules
@@ -2,12 +2,27 @@
 # arch/um: Generic definitions
 # ===========================================================================
 
-USER_SINGLE_OBJS = $(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs))
-USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m) $(USER_SINGLE_OBJS))
-
+USER_SINGLE_OBJS := \
+        $(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs))
+USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m)  $(USER_SINGLE_OBJS))
 USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
 
-$(USER_OBJS): c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(notdir $@))
+$(USER_OBJS) : c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) \
+        $(CFLAGS_$(notdir $@))
 
 quiet_cmd_make_link = SYMLINK $@
-cmd_make_link       = rm -f $@; ln -sf $(srctree)/arch/$(SUBARCH)/$($(notdir $@)-dir)/$(notdir $@) $@
+cmd_make_link       = ln -sf $(srctree)/arch/$(SUBARCH)/$($(notdir $@)-dir)/$(notdir $@) $@
+
+# this needs to be before the foreach, because targets does not accept
+# complete paths like $(obj)/$(f). To make sure this works, use a := assignment
+# or we will get $(obj)/$(f) in the "targets" value.
+# Also, this forces you to use the := syntax when assigning to targets.
+# Otherwise the line below will cause an infinite loop (if you don't know why,
+# just do it).
+
+targets := $(targets) $(SYMLINKS)
+
+SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$(f))
+
+$(SYMLINKS): FORCE
+        $(call if_changed,make_link)
diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile
index 950781e354de..4351e5605506 100644
--- a/arch/um/sys-i386/Makefile
+++ b/arch/um/sys-i386/Makefile
@@ -7,24 +7,13 @@ obj-$(CONFIG_MODULES) += module.o
 
 USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o
 
-include arch/um/scripts/Makefile.rules
-
 SYMLINKS = bitops.c semaphore.c highmem.c module.c
 
-# this needs to be before the foreach, because clean-files does not accept
-# complete paths like $(src)/$f.
-clean-files := $(SYMLINKS)
-
-targets += $(SYMLINKS)
-
-SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$f)
+include arch/um/scripts/Makefile.rules
 
 bitops.c-dir = lib
 semaphore.c-dir = kernel
 highmem.c-dir = mm
 module.c-dir = kernel
 
-$(SYMLINKS): FORCE
-        $(call if_changed,make_link)
-
 subdir- := util
diff --git a/arch/um/sys-i386/checksum.S b/arch/um/sys-i386/checksum.S
index a11171fb6223..d98b2fff3d08 100644
--- a/arch/um/sys-i386/checksum.S
+++ b/arch/um/sys-i386/checksum.S
@@ -38,7 +38,7 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
                 
 .text
 .align 4
-.globl arch_csum_partial                                                                
+.globl csum_partial
                 
 #ifndef CONFIG_X86_USE_PPRO_CHECKSUM
 
@@ -49,7 +49,7 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
            * Fortunately, it is easy to convert 2-byte alignment to 4-byte
            * alignment for the unrolled loop.
            */           
-arch_csum_partial:      
+csum_partial:
         pushl %esi
         pushl %ebx
         movl 20(%esp),%eax      # Function arg: unsigned int sum
@@ -119,7 +119,7 @@ arch_csum_partial:
 
 /* Version for PentiumII/PPro */
 
-arch_csum_partial:
+csum_partial:
         pushl %esi
         pushl %ebx
         movl 20(%esp),%eax      # Function arg: unsigned int sum
diff --git a/arch/um/sys-i386/delay.c b/arch/um/sys-i386/delay.c
index 20d37dbbaf08..2c11b9770e8b 100644
--- a/arch/um/sys-i386/delay.c
+++ b/arch/um/sys-i386/delay.c
@@ -1,3 +1,8 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <asm/param.h>
+
 void __delay(unsigned long time)
 {
         /* Stolen from the i386 __loop_delay */
@@ -12,3 +17,24 @@ void __delay(unsigned long time)
                 :"0" (time));
 }
 
+void __udelay(unsigned long usecs)
+{
+        int i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(__udelay);
+
+void __const_udelay(unsigned long usecs)
+{
+        int i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(__const_udelay);
diff --git a/arch/um/sys-i386/kernel-offsets.c b/arch/um/sys-i386/kernel-offsets.c
new file mode 100644
index 000000000000..9f8ecd1fdd96
--- /dev/null
+++ b/arch/um/sys-i386/kernel-offsets.c
@@ -0,0 +1,25 @@
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <asm/page.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define STR(x) #x
+#define DEFINE_STR(sym, val) asm volatile("\n->" #sym " " STR(val) " " #val: : )
+
+#define BLANK() asm volatile("\n->" : : )
+
+#define OFFSET(sym, str, mem) \
+        DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+        OFFSET(TASK_DEBUGREGS, task_struct, thread.arch.debugregs);
+#ifdef CONFIG_MODE_TT
+        OFFSET(TASK_EXTERN_PID, task_struct, thread.mode.tt.extern_pid);
+#endif
+#include <common-offsets.h>
+}
diff --git a/arch/um/sys-i386/ksyms.c b/arch/um/sys-i386/ksyms.c
index 74f70a120458..db524ab3f743 100644
--- a/arch/um/sys-i386/ksyms.c
+++ b/arch/um/sys-i386/ksyms.c
@@ -2,6 +2,7 @@
 #include "linux/in6.h"
 #include "linux/rwsem.h"
 #include "asm/byteorder.h"
+#include "asm/delay.h"
 #include "asm/semaphore.h"
 #include "asm/uaccess.h"
 #include "asm/checksum.h"
@@ -13,5 +14,8 @@ EXPORT_SYMBOL(__down_failed_trylock);
 EXPORT_SYMBOL(__up_wakeup);
 
 /* Networking helper routines. */
-EXPORT_SYMBOL(csum_partial_copy_from);
-EXPORT_SYMBOL(csum_partial_copy_to);
+EXPORT_SYMBOL(csum_partial);
+
+/* delay core functions */
+EXPORT_SYMBOL(__const_udelay);
+EXPORT_SYMBOL(__udelay);
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index 31bcb2f997d4..dc755b0b9db8 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -25,7 +25,7 @@ int sys_modify_ldt_tt(int func, void __user *ptr, unsigned long bytecount)
 #endif
 
 #ifdef CONFIG_MODE_SKAS
-extern int userspace_pid;
+extern int userspace_pid[];
 
 #include "skas_ptrace.h"
 
@@ -56,7 +56,8 @@ int sys_modify_ldt_skas(int func, void __user *ptr, unsigned long bytecount)
         ldt = ((struct ptrace_ldt) { .func      = func,
                                      .ptr       = buf,
                                      .bytecount = bytecount });
-        res = ptrace(PTRACE_LDT, userspace_pid, 0, (unsigned long) &ldt);
+#warning Need to look up userspace_pid by cpu
+        res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt);
         if(res < 0)
                 goto out;
 
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
index e470d28cdf84..e839ce65ad28 100644
--- a/arch/um/sys-i386/ptrace.c
+++ b/arch/um/sys-i386/ptrace.c
@@ -73,6 +73,25 @@ int putreg(struct task_struct *child, int regno, unsigned long value)
         return 0;
 }
 
+int poke_user(struct task_struct *child, long addr, long data)
+{
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        if (addr < MAX_REG_OFFSET)
+                return putreg(child, addr, data);
+
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                if((addr == 4) || (addr == 5)) return -EIO;
+                child->thread.arch.debugregs[addr] = data;
+                return 0;
+        }
+        return -EIO;
+}
+
 unsigned long getreg(struct task_struct *child, int regno)
 {
         unsigned long retval = ~0UL;
@@ -93,6 +112,27 @@ unsigned long getreg(struct task_struct *child, int regno)
         return retval;
 }
 
+int peek_user(struct task_struct *child, long addr, long data)
+{
+/* read the word at location addr in the USER area. */
+        unsigned long tmp;
+
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        tmp = 0;  /* Default return condition */
+        if(addr < MAX_REG_OFFSET){
+                tmp = getreg(child, addr);
+        }
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                tmp = child->thread.arch.debugregs[addr];
+        }
+        return put_user(tmp, (unsigned long *) data);
+}
+
 struct i387_fxsave_struct {
         unsigned short  cwd;
         unsigned short  swd;
diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 76ba87254b25..03913ca5d256 100644
--- a/arch/um/sys-i386/signal.c
+++ b/arch/um/sys-i386/signal.c
@@ -47,9 +47,6 @@ static int copy_sc_from_user_skas(struct pt_regs *regs,
         REGS_CS(regs->regs.skas.regs) = sc.cs;
         REGS_EFLAGS(regs->regs.skas.regs) = sc.eflags;
         REGS_SS(regs->regs.skas.regs) = sc.ss;
-        regs->regs.skas.fault_addr = sc.cr2;
-        regs->regs.skas.fault_type = FAULT_WRITE(sc.err);
-        regs->regs.skas.trap_type = sc.trapno;
 
         err = restore_fp_registers(userspace_pid[0], fpregs);
         if(err < 0){
@@ -62,11 +59,11 @@ static int copy_sc_from_user_skas(struct pt_regs *regs,
 }
 
 int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
-                         struct pt_regs *regs, unsigned long fault_addr,
-                         int fault_type)
+                         struct pt_regs *regs)
 {
         struct sigcontext sc;
         unsigned long fpregs[HOST_FP_SIZE];
+        struct faultinfo * fi = &current->thread.arch.faultinfo;
         int err;
 
         sc.gs = REGS_GS(regs->regs.skas.regs);
@@ -86,9 +83,9 @@ int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
         sc.eflags = REGS_EFLAGS(regs->regs.skas.regs);
         sc.esp_at_signal = regs->regs.skas.regs[UESP];
         sc.ss = regs->regs.skas.regs[SS];
-        sc.cr2 = fault_addr;
-        sc.err = TO_SC_ERR(fault_type);
-        sc.trapno = regs->regs.skas.trap_type;
+        sc.cr2 = fi->cr2;
+        sc.err = fi->error_code;
+        sc.trapno = fi->trap_no;
 
         err = save_fp_registers(userspace_pid[0], fpregs);
         if(err < 0){
@@ -167,9 +164,7 @@ static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
 {
         return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
                                               sizeof(*fp)),
-                           copy_sc_to_user_skas(to, fp, from,
-                                                current->thread.cr2,
-                                                current->thread.err)));
+                           copy_sc_to_user_skas(to, fp, from)));
 }
 
 static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
diff --git a/arch/um/sys-i386/sysrq.c b/arch/um/sys-i386/sysrq.c
index 281fc7b8ca00..e3706d15c4f5 100644
--- a/arch/um/sys-i386/sysrq.c
+++ b/arch/um/sys-i386/sysrq.c
@@ -3,12 +3,15 @@
  * Licensed under the GPL
  */
 
+#include "linux/config.h"
 #include "linux/kernel.h"
 #include "linux/smp.h"
 #include "linux/sched.h"
+#include "linux/kallsyms.h"
 #include "asm/ptrace.h"
 #include "sysrq.h"
 
+/* This is declared by <linux/sched.h> */
 void show_regs(struct pt_regs *regs)
 {
         printk("\n");
@@ -31,5 +34,80 @@ void show_regs(struct pt_regs *regs)
                0xffff & PT_REGS_DS(regs), 
                0xffff & PT_REGS_ES(regs));
 
-        show_trace((unsigned long *) &regs);
+        show_trace(NULL, (unsigned long *) &regs);
 }
+
+/* Copied from i386. */
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+{
+        return  p > (void *)tinfo &&
+                p < (void *)tinfo + THREAD_SIZE - 3;
+}
+
+/* Adapted from i386 (we also print the address we read from). */
+static inline unsigned long print_context_stack(struct thread_info *tinfo,
+                                unsigned long *stack, unsigned long ebp)
+{
+        unsigned long addr;
+
+#ifdef CONFIG_FRAME_POINTER
+        while (valid_stack_ptr(tinfo, (void *)ebp)) {
+                addr = *(unsigned long *)(ebp + 4);
+                printk("%08lx:  [<%08lx>]", ebp + 4, addr);
+                print_symbol(" %s", addr);
+                printk("\n");
+                ebp = *(unsigned long *)ebp;
+        }
+#else
+        while (valid_stack_ptr(tinfo, stack)) {
+                addr = *stack;
+                if (__kernel_text_address(addr)) {
+                        printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
+                        print_symbol(" %s", addr);
+                        printk("\n");
+                }
+                stack++;
+        }
+#endif
+        return ebp;
+}
+
+void show_trace(struct task_struct* task, unsigned long * stack)
+{
+        unsigned long ebp;
+        struct thread_info *context;
+
+        /* Turn this into BUG_ON if possible. */
+        if (!stack) {
+                stack = (unsigned long*) &stack;
+                printk("show_trace: got NULL stack, implicit assumption task == current");
+                WARN_ON(1);
+        }
+
+        if (!task)
+                task = current;
+
+        if (task != current) {
+                //ebp = (unsigned long) KSTK_EBP(task);
+                /* Which one? No actual difference - just coding style.*/
+                ebp = (unsigned long) PT_REGS_EBP(&task->thread.regs);
+        } else {
+                asm ("movl %%ebp, %0" : "=r" (ebp) : );
+        }
+
+        context = (struct thread_info *)
+                ((unsigned long)stack & (~(THREAD_SIZE - 1)));
+        print_context_stack(context, stack, ebp);
+
+        /*while (((long) stack & (THREAD_SIZE-1)) != 0) {
+                addr = *stack;
+                if (__kernel_text_address(addr)) {
+                        printk("%08lx:  [<%08lx>]", (unsigned long) stack, addr);
+                        print_symbol(" %s", addr);
+                        printk("\n");
+                }
+                stack++;
+        }*/
+        printk("\n");
+}
+
diff --git a/arch/um/sys-i386/user-offsets.c b/arch/um/sys-i386/user-offsets.c
new file mode 100644
index 000000000000..3ceaabceb3d7
--- /dev/null
+++ b/arch/um/sys-i386/user-offsets.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <signal.h>
+#include <asm/ptrace.h>
+#include <asm/user.h>
+#include <linux/stddef.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define OFFSET(sym, str, mem) \
+        DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+        OFFSET(SC_IP, sigcontext, eip);
+        OFFSET(SC_SP, sigcontext, esp);
+        OFFSET(SC_FS, sigcontext, fs);
+        OFFSET(SC_GS, sigcontext, gs);
+        OFFSET(SC_DS, sigcontext, ds);
+        OFFSET(SC_ES, sigcontext, es);
+        OFFSET(SC_SS, sigcontext, ss);
+        OFFSET(SC_CS, sigcontext, cs);
+        OFFSET(SC_EFLAGS, sigcontext, eflags);
+        OFFSET(SC_EAX, sigcontext, eax);
+        OFFSET(SC_EBX, sigcontext, ebx);
+        OFFSET(SC_ECX, sigcontext, ecx);
+        OFFSET(SC_EDX, sigcontext, edx);
+        OFFSET(SC_EDI, sigcontext, edi);
+        OFFSET(SC_ESI, sigcontext, esi);
+        OFFSET(SC_EBP, sigcontext, ebp);
+        OFFSET(SC_TRAPNO, sigcontext, trapno);
+        OFFSET(SC_ERR, sigcontext, err);
+        OFFSET(SC_CR2, sigcontext, cr2);
+        OFFSET(SC_FPSTATE, sigcontext, fpstate);
+        OFFSET(SC_SIGMASK, sigcontext, oldmask);
+        OFFSET(SC_FP_CW, _fpstate, cw);
+        OFFSET(SC_FP_SW, _fpstate, sw);
+        OFFSET(SC_FP_TAG, _fpstate, tag);
+        OFFSET(SC_FP_IPOFF, _fpstate, ipoff);
+        OFFSET(SC_FP_CSSEL, _fpstate, cssel);
+        OFFSET(SC_FP_DATAOFF, _fpstate, dataoff);
+        OFFSET(SC_FP_DATASEL, _fpstate, datasel);
+        OFFSET(SC_FP_ST, _fpstate, _st);
+        OFFSET(SC_FXSR_ENV, _fpstate, _fxsr_env);
+
+        DEFINE(HOST_FRAME_SIZE, FRAME_SIZE);
+        DEFINE(HOST_FP_SIZE,
+                sizeof(struct user_i387_struct) / sizeof(unsigned long));
+        DEFINE(HOST_XFP_SIZE,
+               sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
+
+        DEFINE(HOST_IP, EIP);
+        DEFINE(HOST_SP, UESP);
+        DEFINE(HOST_EFLAGS, EFL);
+        DEFINE(HOST_EAX, EAX);
+        DEFINE(HOST_EBX, EBX);
+        DEFINE(HOST_ECX, ECX);
+        DEFINE(HOST_EDX, EDX);
+        DEFINE(HOST_ESI, ESI);
+        DEFINE(HOST_EDI, EDI);
+        DEFINE(HOST_EBP, EBP);
+        DEFINE(HOST_CS, CS);
+        DEFINE(HOST_SS, SS);
+        DEFINE(HOST_DS, DS);
+        DEFINE(HOST_FS, FS);
+        DEFINE(HOST_ES, ES);
+        DEFINE(HOST_GS, GS);
+        DEFINE(__UM_FRAME_SIZE, sizeof(struct user_regs_struct));
+}
diff --git a/arch/um/sys-i386/util/Makefile b/arch/um/sys-i386/util/Makefile
index 34860f9ca7b0..bf61afd0b045 100644
--- a/arch/um/sys-i386/util/Makefile
+++ b/arch/um/sys-i386/util/Makefile
@@ -1,8 +1,5 @@
-
 hostprogs-y     := mk_sc mk_thread
 always          := $(hostprogs-y)
 
-mk_thread-objs  := mk_thread_kern.o mk_thread_user.o
-
-HOSTCFLAGS_mk_thread_kern.o     := $(CFLAGS) $(CPPFLAGS)
-HOSTCFLAGS_mk_thread_user.o     := $(USER_CFLAGS)
+HOSTCFLAGS_mk_sc.o := -I$(objtree)/arch/um
+HOSTCFLAGS_mk_thread.o := -I$(objtree)/arch/um
diff --git a/arch/um/sys-i386/util/mk_sc.c b/arch/um/sys-i386/util/mk_sc.c
index 85cbd30396f7..04c0d73433aa 100644
--- a/arch/um/sys-i386/util/mk_sc.c
+++ b/arch/um/sys-i386/util/mk_sc.c
@@ -1,52 +1,51 @@
 #include <stdio.h>
-#include <signal.h>
-#include <linux/stddef.h>
+#include <user-offsets.h>
 
 #define SC_OFFSET(name, field) \
-  printf("#define " name "(sc) *((unsigned long *) &(((char *) (sc))[%d]))\n",\
-         offsetof(struct sigcontext, field))
+  printf("#define " #name "(sc) *((unsigned long *) &(((char *) (sc))[%d]))\n",\
+         name)
 
 #define SC_FP_OFFSET(name, field) \
-  printf("#define " name \
+  printf("#define " #name \
          "(sc) *((unsigned long *) &(((char *) (SC_FPSTATE(sc)))[%d]))\n",\
-         offsetof(struct _fpstate, field))
+         name)
 
 #define SC_FP_OFFSET_PTR(name, field, type) \
-  printf("#define " name \
+  printf("#define " #name \
          "(sc) ((" type " *) &(((char *) (SC_FPSTATE(sc)))[%d]))\n",\
-         offsetof(struct _fpstate, field))
+         name)
 
 int main(int argc, char **argv)
 {
-  SC_OFFSET("SC_IP", eip);
-  SC_OFFSET("SC_SP", esp);
-  SC_OFFSET("SC_FS", fs);
-  SC_OFFSET("SC_GS", gs);
-  SC_OFFSET("SC_DS", ds);
-  SC_OFFSET("SC_ES", es);
-  SC_OFFSET("SC_SS", ss);
-  SC_OFFSET("SC_CS", cs);
-  SC_OFFSET("SC_EFLAGS", eflags);
-  SC_OFFSET("SC_EAX", eax);
-  SC_OFFSET("SC_EBX", ebx);
-  SC_OFFSET("SC_ECX", ecx);
-  SC_OFFSET("SC_EDX", edx);
-  SC_OFFSET("SC_EDI", edi);
-  SC_OFFSET("SC_ESI", esi);
-  SC_OFFSET("SC_EBP", ebp);
-  SC_OFFSET("SC_TRAPNO", trapno);
-  SC_OFFSET("SC_ERR", err);
-  SC_OFFSET("SC_CR2", cr2);
-  SC_OFFSET("SC_FPSTATE", fpstate);
-  SC_OFFSET("SC_SIGMASK", oldmask);
-  SC_FP_OFFSET("SC_FP_CW", cw);
-  SC_FP_OFFSET("SC_FP_SW", sw);
-  SC_FP_OFFSET("SC_FP_TAG", tag);
-  SC_FP_OFFSET("SC_FP_IPOFF", ipoff);
-  SC_FP_OFFSET("SC_FP_CSSEL", cssel);
-  SC_FP_OFFSET("SC_FP_DATAOFF", dataoff);
-  SC_FP_OFFSET("SC_FP_DATASEL", datasel);
-  SC_FP_OFFSET_PTR("SC_FP_ST", _st, "struct _fpstate");
-  SC_FP_OFFSET_PTR("SC_FXSR_ENV", _fxsr_env, "void");
+  SC_OFFSET(SC_IP, eip);
+  SC_OFFSET(SC_SP, esp);
+  SC_OFFSET(SC_FS, fs);
+  SC_OFFSET(SC_GS, gs);
+  SC_OFFSET(SC_DS, ds);
+  SC_OFFSET(SC_ES, es);
+  SC_OFFSET(SC_SS, ss);
+  SC_OFFSET(SC_CS, cs);
+  SC_OFFSET(SC_EFLAGS, eflags);
+  SC_OFFSET(SC_EAX, eax);
+  SC_OFFSET(SC_EBX, ebx);
+  SC_OFFSET(SC_ECX, ecx);
+  SC_OFFSET(SC_EDX, edx);
+  SC_OFFSET(SC_EDI, edi);
+  SC_OFFSET(SC_ESI, esi);
+  SC_OFFSET(SC_EBP, ebp);
+  SC_OFFSET(SC_TRAPNO, trapno);
+  SC_OFFSET(SC_ERR, err);
+  SC_OFFSET(SC_CR2, cr2);
+  SC_OFFSET(SC_FPSTATE, fpstate);
+  SC_OFFSET(SC_SIGMASK, oldmask);
+  SC_FP_OFFSET(SC_FP_CW, cw);
+  SC_FP_OFFSET(SC_FP_SW, sw);
+  SC_FP_OFFSET(SC_FP_TAG, tag);
+  SC_FP_OFFSET(SC_FP_IPOFF, ipoff);
+  SC_FP_OFFSET(SC_FP_CSSEL, cssel);
+  SC_FP_OFFSET(SC_FP_DATAOFF, dataoff);
+  SC_FP_OFFSET(SC_FP_DATASEL, datasel);
+  SC_FP_OFFSET_PTR(SC_FP_ST, _st, "struct _fpstate");
+  SC_FP_OFFSET_PTR(SC_FXSR_ENV, _fxsr_env, "void");
   return(0);
 }
diff --git a/arch/um/sys-i386/util/mk_thread.c b/arch/um/sys-i386/util/mk_thread.c
new file mode 100644
index 000000000000..7470d0dda67e
--- /dev/null
+++ b/arch/um/sys-i386/util/mk_thread.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <kernel-offsets.h>
+
+int main(int argc, char **argv)
+{
+  printf("/*\n");
+  printf(" * Generated by mk_thread\n");
+  printf(" */\n");
+  printf("\n");
+  printf("#ifndef __UM_THREAD_H\n");
+  printf("#define __UM_THREAD_H\n");
+  printf("\n");
+  printf("#define TASK_DEBUGREGS(task) ((unsigned long *) "
+         "&(((char *) (task))[%d]))\n", TASK_DEBUGREGS);
+#ifdef TASK_EXTERN_PID
+  printf("#define TASK_EXTERN_PID(task) *((int *) &(((char *) (task))[%d]))\n",
+         TASK_EXTERN_PID);
+#endif
+  printf("\n");
+  printf("#endif\n");
+  return(0);
+}
diff --git a/arch/um/sys-i386/util/mk_thread_kern.c b/arch/um/sys-i386/util/mk_thread_kern.c
deleted file mode 100644
index 948b1ce85230..000000000000
--- a/arch/um/sys-i386/util/mk_thread_kern.c
+++ /dev/null
@@ -1,22 +0,0 @@
-#include "linux/config.h"
-#include "linux/stddef.h"
-#include "linux/sched.h"
-
-extern void print_head(void);
-extern void print_constant_ptr(char *name, int value);
-extern void print_constant(char *name, char *type, int value);
-extern void print_tail(void);
-
-#define THREAD_OFFSET(field) offsetof(struct task_struct, thread.field)
-
-int main(int argc, char **argv)
-{
-  print_head();
-  print_constant_ptr("TASK_DEBUGREGS", THREAD_OFFSET(arch.debugregs));
-#ifdef CONFIG_MODE_TT
-  print_constant("TASK_EXTERN_PID", "int", THREAD_OFFSET(mode.tt.extern_pid));
-#endif
-  print_tail();
-  return(0);
-}
-
diff --git a/arch/um/sys-i386/util/mk_thread_user.c b/arch/um/sys-i386/util/mk_thread_user.c
deleted file mode 100644
index 2620cd6aa1f1..000000000000
--- a/arch/um/sys-i386/util/mk_thread_user.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include <stdio.h>
-
-void print_head(void)
-{
-  printf("/*\n");
-  printf(" * Generated by mk_thread\n");
-  printf(" */\n");
-  printf("\n");
-  printf("#ifndef __UM_THREAD_H\n");
-  printf("#define __UM_THREAD_H\n");
-  printf("\n");
-}
-
-void print_constant_ptr(char *name, int value)
-{
-  printf("#define %s(task) ((unsigned long *) "
-         "&(((char *) (task))[%d]))\n", name, value);
-}
-
-void print_constant(char *name, char *type, int value)
-{
-  printf("#define %s(task) *((%s *) &(((char *) (task))[%d]))\n", name, type, 
-         value);
-}
-
-void print_tail(void)
-{
-  printf("\n");
-  printf("#endif\n");
-}
diff --git a/arch/um/sys-ppc/ptrace.c b/arch/um/sys-ppc/ptrace.c
index a971366d3277..8e71b47f2b8e 100644
--- a/arch/um/sys-ppc/ptrace.c
+++ b/arch/um/sys-ppc/ptrace.c
@@ -8,6 +8,25 @@ int putreg(struct task_struct *child, unsigned long regno,
         return 0;
 }
 
+int poke_user(struct task_struct *child, long addr, long data)
+{
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        if (addr < MAX_REG_OFFSET)
+                return putreg(child, addr, data);
+
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                  addr -= offsetof(struct user, u_debugreg[0]);
+                  addr = addr >> 2;
+                  if((addr == 4) || (addr == 5)) return -EIO;
+                  child->thread.arch.debugregs[addr] = data;
+                  return 0;
+        }
+        return -EIO;
+}
+
 unsigned long getreg(struct task_struct *child, unsigned long regno)
 {
         unsigned long retval = ~0UL;
@@ -16,6 +35,27 @@ unsigned long getreg(struct task_struct *child, unsigned long regno)
         return retval;
 }
 
+int peek_user(struct task_struct *child, long addr, long data)
+{
+        /* read the word at location addr in the USER area. */
+        unsigned long tmp;
+
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        tmp = 0;  /* Default return condition */
+        if(addr < MAX_REG_OFFSET){
+                tmp = getreg(child, addr);
+        }
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                tmp = child->thread.arch.debugregs[addr];
+        }
+        return put_user(tmp, (unsigned long *) data);
+}
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically
diff --git a/arch/um/sys-ppc/sysrq.c b/arch/um/sys-ppc/sysrq.c
index 82d6e9335bb6..2f816f1a0ff4 100644
--- a/arch/um/sys-ppc/sysrq.c
+++ b/arch/um/sys-ppc/sysrq.c
@@ -27,17 +27,5 @@ void show_regs(struct pt_regs_subarch *regs)
                 0xffff & regs->xds, 0xffff & regs->xes);
 #endif
 
-        show_trace(&regs->gpr[1]);
+        show_trace(current, &regs->gpr[1]);
 }
-
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
index d7ed2f7908df..608466ad6b22 100644
--- a/arch/um/sys-x86_64/Makefile
+++ b/arch/um/sys-x86_64/Makefile
@@ -4,24 +4,20 @@
 # Licensed under the GPL
 #
 
+#XXX: why into lib-y?
 lib-y = bitops.o bugs.o csum-partial.o delay.o fault.o mem.o memcpy.o \
         ptrace.o ptrace_user.o semaphore.o sigcontext.o signal.o \
         syscalls.o sysrq.o thunk.o syscall_table.o
 
-USER_OBJS := ptrace_user.o sigcontext.o
+obj-y := ksyms.o
+obj-$(CONFIG_MODULES) += module.o um_module.o
 
-include arch/um/scripts/Makefile.rules
+USER_OBJS := ptrace_user.o sigcontext.o
 
 SYMLINKS = bitops.c csum-copy.S csum-partial.c csum-wrappers.c memcpy.S \
-        semaphore.c thunk.S
-
-# this needs to be before the foreach, because clean-files does not accept
-# complete paths like $(src)/$f.
-clean-files := $(SYMLINKS)
+        semaphore.c thunk.S module.c
 
-targets += $(SYMLINKS)
-
-SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$f)
+include arch/um/scripts/Makefile.rules
 
 bitops.c-dir = lib
 csum-copy.S-dir = lib
@@ -30,8 +26,6 @@ csum-wrappers.c-dir = lib
 memcpy.S-dir = lib
 semaphore.c-dir = kernel
 thunk.S-dir = lib
+module.c-dir = kernel
 
-$(SYMLINKS): FORCE
-        $(call if_changed,make_link)
-
-CFLAGS_csum-partial.o := -Dcsum_partial=arch_csum_partial
+subdir- := util
diff --git a/arch/um/sys-x86_64/delay.c b/arch/um/sys-x86_64/delay.c
index f3b5187942b4..137f4446b439 100644
--- a/arch/um/sys-x86_64/delay.c
+++ b/arch/um/sys-x86_64/delay.c
@@ -5,22 +5,37 @@
  * Licensed under the GPL
  */
 
-#include "asm/processor.h"
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <asm/processor.h>
+#include <asm/param.h>
 
 void __delay(unsigned long loops)
 {
         unsigned long i;
 
-        for(i = 0; i < loops; i++) ;
+        for(i = 0; i < loops; i++)
+                cpu_relax();
 }
 
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+void __udelay(unsigned long usecs)
+{
+        unsigned long i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(__udelay);
+
+void __const_udelay(unsigned long usecs)
+{
+        unsigned long i, n;
+
+        n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(__const_udelay);
diff --git a/arch/um/sys-x86_64/kernel-offsets.c b/arch/um/sys-x86_64/kernel-offsets.c
new file mode 100644
index 000000000000..220e875cbe29
--- /dev/null
+++ b/arch/um/sys-x86_64/kernel-offsets.c
@@ -0,0 +1,24 @@
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <asm/page.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define DEFINE_STR1(x) #x
+#define DEFINE_STR(sym, val) asm volatile("\n->" #sym " " DEFINE_STR1(val) " " #val: : )
+
+#define BLANK() asm volatile("\n->" : : )
+
+#define OFFSET(sym, str, mem) \
+        DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+#ifdef CONFIG_MODE_TT
+        OFFSET(TASK_EXTERN_PID, task_struct, thread.mode.tt.extern_pid);
+#endif
+#include <common-offsets.h>
+}
diff --git a/arch/um/sys-x86_64/ksyms.c b/arch/um/sys-x86_64/ksyms.c
new file mode 100644
index 000000000000..859273808203
--- /dev/null
+++ b/arch/um/sys-x86_64/ksyms.c
@@ -0,0 +1,19 @@
+#include "linux/module.h"
+#include "linux/in6.h"
+#include "linux/rwsem.h"
+#include "asm/byteorder.h"
+#include "asm/semaphore.h"
+#include "asm/uaccess.h"
+#include "asm/checksum.h"
+#include "asm/errno.h"
+
+EXPORT_SYMBOL(__down_failed);
+EXPORT_SYMBOL(__down_failed_interruptible);
+EXPORT_SYMBOL(__down_failed_trylock);
+EXPORT_SYMBOL(__up_wakeup);
+
+/*XXX: we need them because they would be exported by x86_64 */
+EXPORT_SYMBOL(__memcpy);
+
+/* Networking helper routines. */
+EXPORT_SYMBOL(ip_compute_csum);
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index 8c146b2a1e00..74eee5c7c6dd 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -5,10 +5,11 @@
  */
 
 #define __FRAME_OFFSETS
-#include "asm/ptrace.h"
-#include "linux/sched.h"
-#include "linux/errno.h"
-#include "asm/elf.h"
+#include <asm/ptrace.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <asm/elf.h>
 
 /* XXX x86_64 */
 unsigned long not_ss;
@@ -62,6 +63,27 @@ int putreg(struct task_struct *child, int regno, unsigned long value)
         return 0;
 }
 
+int poke_user(struct task_struct *child, long addr, long data)
+{
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        if (addr < MAX_REG_OFFSET)
+                return putreg(child, addr, data);
+
+#if 0 /* Need x86_64 debugregs handling */
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                if((addr == 4) || (addr == 5)) return -EIO;
+                child->thread.arch.debugregs[addr] = data;
+                return 0;
+        }
+#endif
+        return -EIO;
+}
+
 unsigned long getreg(struct task_struct *child, int regno)
 {
         unsigned long retval = ~0UL;
@@ -84,6 +106,29 @@ unsigned long getreg(struct task_struct *child, int regno)
         return retval;
 }
 
+int peek_user(struct task_struct *child, long addr, long data)
+{
+        /* read the word at location addr in the USER area. */
+        unsigned long tmp;
+
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        tmp = 0;  /* Default return condition */
+        if(addr < MAX_REG_OFFSET){
+                tmp = getreg(child, addr);
+        }
+#if 0 /* Need x86_64 debugregs handling */
+        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+                (addr <= offsetof(struct user, u_debugreg[7]))){
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                tmp = child->thread.arch.debugregs[addr];
+        }
+#endif
+        return put_user(tmp, (unsigned long *) data);
+}
+
 void arch_switch(void)
 {
 /* XXX
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
index 5bc5a0d796e5..73a7926f7370 100644
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -57,7 +57,7 @@ static int copy_sc_from_user_skas(struct pt_regs *regs,
 int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
                         struct pt_regs *regs, unsigned long mask)
 {
-        unsigned long eflags;
+        struct faultinfo * fi = &current->thread.arch.faultinfo;
         int err = 0;
 
         err |= __put_user(0, &to->gs);
@@ -84,14 +84,16 @@ int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
         err |= PUTREG(regs, R14, to, r14);
         err |= PUTREG(regs, R15, to, r15);
         err |= PUTREG(regs, CS, to, cs); /* XXX x86_64 doesn't do this */
-        err |= __put_user(current->thread.err, &to->err);
-        err |= __put_user(current->thread.trap_no, &to->trapno);
+
+        err |= __put_user(fi->cr2, &to->cr2);
+        err |= __put_user(fi->error_code, &to->err);
+        err |= __put_user(fi->trap_no, &to->trapno);
+
         err |= PUTREG(regs, RIP, to, rip);
         err |= PUTREG(regs, EFLAGS, to, eflags);
 #undef PUTREG
 
         err |= __put_user(mask, &to->oldmask);
-        err |= __put_user(current->thread.cr2, &to->cr2);
 
         return(err);
 }
@@ -166,7 +168,7 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
 
         frame = (struct rt_sigframe __user *)
                 round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
-        frame -= 128;
+        ((unsigned char *) frame) -= 128;
 
         if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
                 goto out;
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c
index ab4b0abf8af3..6f44f40204ed 100644
--- a/arch/um/sys-x86_64/syscalls.c
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -7,12 +7,15 @@
 #include "linux/linkage.h"
 #include "linux/slab.h"
 #include "linux/shm.h"
+#include "linux/utsname.h"
+#include "linux/personality.h"
 #include "asm/uaccess.h"
 #define __FRAME_OFFSETS
 #include "asm/ptrace.h"
 #include "asm/unistd.h"
 #include "asm/prctl.h" /* XXX This should get the constants from libc */
 #include "choose-mode.h"
+#include "kern.h"
 
 asmlinkage long sys_uname64(struct new_utsname __user * name)
 {
@@ -42,6 +45,8 @@ long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount)
 #ifdef CONFIG_MODE_SKAS
 extern int userspace_pid[];
 
+#include "skas_ptrace.h"
+
 long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount)
 {
         struct ptrace_ldt ldt;
@@ -128,23 +133,27 @@ static long arch_prctl_tt(int code, unsigned long addr)
 
 #ifdef CONFIG_MODE_SKAS
 
+/* XXX: Must also call arch_prctl in the host, beside saving the segment bases! */
 static long arch_prctl_skas(int code, unsigned long addr)
 {
         long ret = 0;
 
         switch(code){
-        case ARCH_SET_GS:
-                current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
-                break;
         case ARCH_SET_FS:
                 current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
                 break;
+        case ARCH_SET_GS:
+                current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
+                break;
         case ARCH_GET_FS:
-                ret = put_user(current->thread.regs.regs.skas.regs[GS / sizeof(unsigned long)], &addr);
+                ret = put_user(current->thread.regs.regs.skas.
+                                regs[FS_BASE / sizeof(unsigned long)],
+                                (unsigned long __user *)addr);
                 break;
         case ARCH_GET_GS:
-                ret = put_user(current->thread.regs.regs.skas.regs[FS / sizeof(unsigned \
-long)], &addr);
+                ret = put_user(current->thread.regs.regs.skas.
+                                regs[GS_BASE / sizeof(unsigned long)],
+                                (unsigned long __user *)addr);
                 break;
         default:
                 ret = -EINVAL;
diff --git a/arch/um/sys-x86_64/sysrq.c b/arch/um/sys-x86_64/sysrq.c
index ddf74691a610..d0a25af19a5b 100644
--- a/arch/um/sys-x86_64/sysrq.c
+++ b/arch/um/sys-x86_64/sysrq.c
@@ -36,14 +36,5 @@ void __show_regs(struct pt_regs * regs)
 void show_regs(struct pt_regs *regs)
 {
         __show_regs(regs);
-        show_trace((unsigned long *) &regs);
+        show_trace(current, (unsigned long *) &regs);
 }
-
-/* Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/sys-x86_64/um_module.c b/arch/um/sys-x86_64/um_module.c
new file mode 100644
index 000000000000..8b8eff1bd977
--- /dev/null
+++ b/arch/um/sys-x86_64/um_module.c
@@ -0,0 +1,19 @@
+#include <linux/vmalloc.h>
+#include <linux/moduleloader.h>
+
+/*Copied from i386 arch/i386/kernel/module.c */
+void *module_alloc(unsigned long size)
+{
+        if (size == 0)
+                return NULL;
+        return vmalloc_exec(size);
+}
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+        vfree(module_region);
+        /* FIXME: If module_region == mod->init_region, trim exception
+           table entries. */
+}
+
diff --git a/arch/um/sys-x86_64/user-offsets.c b/arch/um/sys-x86_64/user-offsets.c
new file mode 100644
index 000000000000..513d17ceafd4
--- /dev/null
+++ b/arch/um/sys-x86_64/user-offsets.c
@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stddef.h>
+#include <signal.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+#include <asm/types.h>
+/* For some reason, x86_64 defines u64 and u32 only in <pci/types.h>, which I
+ * refuse to include here, even though they're used throughout the headers.
+ * These are used in asm/user.h, and that include can't be avoided because of
+ * the sizeof(struct user_regs_struct) below.
+ */
+typedef __u64 u64;
+typedef __u32 u32;
+#include <asm/user.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define OFFSET(sym, str, mem) \
+        DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+        OFFSET(SC_RBX, sigcontext, rbx);
+        OFFSET(SC_RCX, sigcontext, rcx);
+        OFFSET(SC_RDX, sigcontext, rdx);
+        OFFSET(SC_RSI, sigcontext, rsi);
+        OFFSET(SC_RDI, sigcontext, rdi);
+        OFFSET(SC_RBP, sigcontext, rbp);
+        OFFSET(SC_RAX, sigcontext, rax);
+        OFFSET(SC_R8, sigcontext, r8);
+        OFFSET(SC_R9, sigcontext, r9);
+        OFFSET(SC_R10, sigcontext, r10);
+        OFFSET(SC_R11, sigcontext, r11);
+        OFFSET(SC_R12, sigcontext, r12);
+        OFFSET(SC_R13, sigcontext, r13);
+        OFFSET(SC_R14, sigcontext, r14);
+        OFFSET(SC_R15, sigcontext, r15);
+        OFFSET(SC_IP, sigcontext, rip);
+        OFFSET(SC_SP, sigcontext, rsp);
+        OFFSET(SC_CR2, sigcontext, cr2);
+        OFFSET(SC_ERR, sigcontext, err);
+        OFFSET(SC_TRAPNO, sigcontext, trapno);
+        OFFSET(SC_CS, sigcontext, cs);
+        OFFSET(SC_FS, sigcontext, fs);
+        OFFSET(SC_GS, sigcontext, gs);
+        OFFSET(SC_EFLAGS, sigcontext, eflags);
+        OFFSET(SC_SIGMASK, sigcontext, oldmask);
+#if 0
+        OFFSET(SC_ORIG_RAX, sigcontext, orig_rax);
+        OFFSET(SC_DS, sigcontext, ds);
+        OFFSET(SC_ES, sigcontext, es);
+        OFFSET(SC_SS, sigcontext, ss);
+#endif
+
+        DEFINE(HOST_FRAME_SIZE, FRAME_SIZE);
+        DEFINE(HOST_RBX, RBX);
+        DEFINE(HOST_RCX, RCX);
+        DEFINE(HOST_RDI, RDI);
+        DEFINE(HOST_RSI, RSI);
+        DEFINE(HOST_RDX, RDX);
+        DEFINE(HOST_RBP, RBP);
+        DEFINE(HOST_RAX, RAX);
+        DEFINE(HOST_R8, R8);
+        DEFINE(HOST_R9, R9);
+        DEFINE(HOST_R10, R10);
+        DEFINE(HOST_R11, R11);
+        DEFINE(HOST_R12, R12);
+        DEFINE(HOST_R13, R13);
+        DEFINE(HOST_R14, R14);
+        DEFINE(HOST_R15, R15);
+        DEFINE(HOST_ORIG_RAX, ORIG_RAX);
+        DEFINE(HOST_CS, CS);
+        DEFINE(HOST_SS, SS);
+        DEFINE(HOST_EFLAGS, EFLAGS);
+#if 0
+        DEFINE(HOST_FS, FS);
+        DEFINE(HOST_GS, GS);
+        DEFINE(HOST_DS, DS);
+        DEFINE(HOST_ES, ES);
+#endif
+
+        DEFINE(HOST_IP, RIP);
+        DEFINE(HOST_SP, RSP);
+        DEFINE(__UM_FRAME_SIZE, sizeof(struct user_regs_struct));
+}
diff --git a/arch/um/sys-x86_64/util/Makefile b/arch/um/sys-x86_64/util/Makefile
index 002607980864..75b052cfc206 100644
--- a/arch/um/sys-x86_64/util/Makefile
+++ b/arch/um/sys-x86_64/util/Makefile
@@ -4,7 +4,5 @@
 hostprogs-y     := mk_sc mk_thread
 always          := $(hostprogs-y)
 
-mk_thread-objs  := mk_thread_kern.o mk_thread_user.o
-
-HOSTCFLAGS_mk_thread_kern.o     := $(CFLAGS) $(CPPFLAGS)
-HOSTCFLAGS_mk_thread_user.o     := $(USER_CFLAGS)
+HOSTCFLAGS_mk_sc.o := -I$(objtree)/arch/um
+HOSTCFLAGS_mk_thread.o := -I$(objtree)/arch/um
diff --git a/arch/um/sys-x86_64/util/mk_sc.c b/arch/um/sys-x86_64/util/mk_sc.c
index c236e213918d..7619bc377c1f 100644
--- a/arch/um/sys-x86_64/util/mk_sc.c
+++ b/arch/um/sys-x86_64/util/mk_sc.c
@@ -3,56 +3,45 @@
  */
 
 #include <stdio.h>
-#include <signal.h>
-#include <linux/stddef.h>
+#include <user-offsets.h>
 
-#define SC_OFFSET(name, field) \
-  printf("#define " name \
-         "(sc) *((unsigned long *) &(((char *) (sc))[%ld]))\n",\
-         offsetof(struct sigcontext, field))
-
-#define SC_FP_OFFSET(name, field) \
-  printf("#define " name \
-         "(sc) *((unsigned long *) &(((char *) (SC_FPSTATE(sc)))[%ld]))\n",\
-         offsetof(struct _fpstate, field))
-
-#define SC_FP_OFFSET_PTR(name, field, type) \
-  printf("#define " name \
-         "(sc) ((" type " *) &(((char *) (SC_FPSTATE(sc)))[%d]))\n",\
-         offsetof(struct _fpstate, field))
+#define SC_OFFSET(name) \
+  printf("#define " #name \
+         "(sc) *((unsigned long *) &(((char *) (sc))[%d]))\n",\
+         name)
 
 int main(int argc, char **argv)
 {
-  SC_OFFSET("SC_RBX", rbx);
-  SC_OFFSET("SC_RCX", rcx);
-  SC_OFFSET("SC_RDX", rdx);
-  SC_OFFSET("SC_RSI", rsi);
-  SC_OFFSET("SC_RDI", rdi);
-  SC_OFFSET("SC_RBP", rbp);
-  SC_OFFSET("SC_RAX", rax);
-  SC_OFFSET("SC_R8", r8);
-  SC_OFFSET("SC_R9", r9);
-  SC_OFFSET("SC_R10", r10);
-  SC_OFFSET("SC_R11", r11);
-  SC_OFFSET("SC_R12", r12);
-  SC_OFFSET("SC_R13", r13);
-  SC_OFFSET("SC_R14", r14);
-  SC_OFFSET("SC_R15", r15);
-  SC_OFFSET("SC_IP", rip);
-  SC_OFFSET("SC_SP", rsp);
-  SC_OFFSET("SC_CR2", cr2);
-  SC_OFFSET("SC_ERR", err);
-  SC_OFFSET("SC_TRAPNO", trapno);
-  SC_OFFSET("SC_CS", cs);
-  SC_OFFSET("SC_FS", fs);
-  SC_OFFSET("SC_GS", gs);
-  SC_OFFSET("SC_EFLAGS", eflags);
-  SC_OFFSET("SC_SIGMASK", oldmask);
+  SC_OFFSET(SC_RBX);
+  SC_OFFSET(SC_RCX);
+  SC_OFFSET(SC_RDX);
+  SC_OFFSET(SC_RSI);
+  SC_OFFSET(SC_RDI);
+  SC_OFFSET(SC_RBP);
+  SC_OFFSET(SC_RAX);
+  SC_OFFSET(SC_R8);
+  SC_OFFSET(SC_R9);
+  SC_OFFSET(SC_R10);
+  SC_OFFSET(SC_R11);
+  SC_OFFSET(SC_R12);
+  SC_OFFSET(SC_R13);
+  SC_OFFSET(SC_R14);
+  SC_OFFSET(SC_R15);
+  SC_OFFSET(SC_IP);
+  SC_OFFSET(SC_SP);
+  SC_OFFSET(SC_CR2);
+  SC_OFFSET(SC_ERR);
+  SC_OFFSET(SC_TRAPNO);
+  SC_OFFSET(SC_CS);
+  SC_OFFSET(SC_FS);
+  SC_OFFSET(SC_GS);
+  SC_OFFSET(SC_EFLAGS);
+  SC_OFFSET(SC_SIGMASK);
 #if 0
-  SC_OFFSET("SC_ORIG_RAX", orig_rax);
-  SC_OFFSET("SC_DS", ds);
-  SC_OFFSET("SC_ES", es);
-  SC_OFFSET("SC_SS", ss);
+  SC_OFFSET(SC_ORIG_RAX);
+  SC_OFFSET(SC_DS);
+  SC_OFFSET(SC_ES);
+  SC_OFFSET(SC_SS);
 #endif
   return(0);
 }
diff --git a/arch/um/sys-x86_64/util/mk_thread.c b/arch/um/sys-x86_64/util/mk_thread.c
new file mode 100644
index 000000000000..15517396e9cf
--- /dev/null
+++ b/arch/um/sys-x86_64/util/mk_thread.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <kernel-offsets.h>
+
+int main(int argc, char **argv)
+{
+  printf("/*\n");
+  printf(" * Generated by mk_thread\n");
+  printf(" */\n");
+  printf("\n");
+  printf("#ifndef __UM_THREAD_H\n");
+  printf("#define __UM_THREAD_H\n");
+  printf("\n");
+#ifdef TASK_EXTERN_PID
+  printf("#define TASK_EXTERN_PID(task) *((int *) &(((char *) (task))[%d]))\n",
+         TASK_EXTERN_PID);
+#endif
+  printf("\n");
+  printf("#endif\n");
+  return(0);
+}
diff --git a/arch/um/sys-x86_64/util/mk_thread_kern.c b/arch/um/sys-x86_64/util/mk_thread_kern.c
deleted file mode 100644
index a281673f02b2..000000000000
--- a/arch/um/sys-x86_64/util/mk_thread_kern.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include "linux/config.h"
-#include "linux/stddef.h"
-#include "linux/sched.h"
-
-extern void print_head(void);
-extern void print_constant_ptr(char *name, int value);
-extern void print_constant(char *name, char *type, int value);
-extern void print_tail(void);
-
-#define THREAD_OFFSET(field) offsetof(struct task_struct, thread.field)
-
-int main(int argc, char **argv)
-{
-  print_head();
-#ifdef CONFIG_MODE_TT
-  print_constant("TASK_EXTERN_PID", "int", THREAD_OFFSET(mode.tt.extern_pid));
-#endif
-  print_tail();
-  return(0);
-}
-
diff --git a/arch/um/sys-x86_64/util/mk_thread_user.c b/arch/um/sys-x86_64/util/mk_thread_user.c
deleted file mode 100644
index 7989725568b8..000000000000
--- a/arch/um/sys-x86_64/util/mk_thread_user.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include <stdio.h>
-
-void print_head(void)
-{
-  printf("/*\n");
-  printf(" * Generated by mk_thread\n");
-  printf(" */\n");
-  printf("\n");
-  printf("#ifndef __UM_THREAD_H\n");
-  printf("#define __UM_THREAD_H\n");
-  printf("\n");
-}
-
-void print_constant_ptr(char *name, int value)
-{
-  printf("#define %s(task) ((unsigned long *) "
-         "&(((char *) (task))[%d]))\n", name, value);
-}
-
-void print_constant(char *name, char *type, int value)
-{
-  printf("#define %s(task) *((%s *) &(((char *) (task))[%d]))\n", name, type,
-         value);
-}
-
-void print_tail(void)
-{
-  printf("\n");
-  printf("#endif\n");
-}
diff --git a/arch/um/util/Makefile b/arch/um/util/Makefile
index e2ab71209f3f..4c7551c28033 100644
--- a/arch/um/util/Makefile
+++ b/arch/um/util/Makefile
@@ -1,8 +1,5 @@
 hostprogs-y             := mk_task mk_constants
 always                  := $(hostprogs-y)
 
-mk_task-objs            := mk_task_user.o mk_task_kern.o
-mk_constants-objs       := mk_constants_user.o mk_constants_kern.o
-
-HOSTCFLAGS_mk_task_kern.o       := $(CFLAGS) $(CPPFLAGS)
-HOSTCFLAGS_mk_constants_kern.o  := $(CFLAGS) $(CPPFLAGS)
+HOSTCFLAGS_mk_task.o := -I$(objtree)/arch/um
+HOSTCFLAGS_mk_constants.o := -I$(objtree)/arch/um
diff --git a/arch/um/util/mk_constants.c b/arch/um/util/mk_constants.c
new file mode 100644
index 000000000000..ab217becc36a
--- /dev/null
+++ b/arch/um/util/mk_constants.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <kernel-offsets.h>
+
+#define SHOW_INT(sym) printf("#define %s %d\n", #sym, sym)
+#define SHOW_STR(sym) printf("#define %s %s\n", #sym, sym)
+
+int main(int argc, char **argv)
+{
+  printf("/*\n");
+  printf(" * Generated by mk_constants\n");
+  printf(" */\n");
+  printf("\n");
+  printf("#ifndef __UM_CONSTANTS_H\n");
+  printf("#define __UM_CONSTANTS_H\n");
+  printf("\n");
+
+  SHOW_INT(UM_KERN_PAGE_SIZE);
+
+  SHOW_STR(UM_KERN_EMERG);
+  SHOW_STR(UM_KERN_ALERT);
+  SHOW_STR(UM_KERN_CRIT);
+  SHOW_STR(UM_KERN_ERR);
+  SHOW_STR(UM_KERN_WARNING);
+  SHOW_STR(UM_KERN_NOTICE);
+  SHOW_STR(UM_KERN_INFO);
+  SHOW_STR(UM_KERN_DEBUG);
+
+  SHOW_INT(UM_NSEC_PER_SEC);
+  printf("\n");
+  printf("#endif\n");
+  return(0);
+}
diff --git a/arch/um/util/mk_constants_kern.c b/arch/um/util/mk_constants_kern.c
deleted file mode 100644
index cdcb1232a1ea..000000000000
--- a/arch/um/util/mk_constants_kern.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#include "linux/kernel.h"
-#include "linux/stringify.h"
-#include "linux/time.h"
-#include "asm/page.h"
-
-extern void print_head(void);
-extern void print_constant_str(char *name, char *value);
-extern void print_constant_int(char *name, int value);
-extern void print_tail(void);
-
-int main(int argc, char **argv)
-{
-  print_head();
-  print_constant_int("UM_KERN_PAGE_SIZE", PAGE_SIZE);
-
-  print_constant_str("UM_KERN_EMERG", KERN_EMERG);
-  print_constant_str("UM_KERN_ALERT", KERN_ALERT);
-  print_constant_str("UM_KERN_CRIT", KERN_CRIT);
-  print_constant_str("UM_KERN_ERR", KERN_ERR);
-  print_constant_str("UM_KERN_WARNING", KERN_WARNING);
-  print_constant_str("UM_KERN_NOTICE", KERN_NOTICE);
-  print_constant_str("UM_KERN_INFO", KERN_INFO);
-  print_constant_str("UM_KERN_DEBUG", KERN_DEBUG);
-
-  print_constant_int("UM_NSEC_PER_SEC", NSEC_PER_SEC);
-  print_tail();
-  return(0);
-}
diff --git a/arch/um/util/mk_constants_user.c b/arch/um/util/mk_constants_user.c
deleted file mode 100644
index 8f4d7e50be7c..000000000000
--- a/arch/um/util/mk_constants_user.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#include <stdio.h>
-
-void print_head(void)
-{
-  printf("/*\n");
-  printf(" * Generated by mk_constants\n");
-  printf(" */\n");
-  printf("\n");
-  printf("#ifndef __UM_CONSTANTS_H\n");
-  printf("#define __UM_CONSTANTS_H\n");
-  printf("\n");
-}
-
-void print_constant_str(char *name, char *value)
-{
-  printf("#define %s \"%s\"\n", name, value);
-}
-
-void print_constant_int(char *name, int value)
-{
-  printf("#define %s %d\n", name, value);
-}
-
-void print_tail(void)
-{
-  printf("\n");
-  printf("#endif\n");
-}
diff --git a/arch/um/util/mk_task_user.c b/arch/um/util/mk_task.c
index 9db849f3f3ac..36c9606505e2 100644
--- a/arch/um/util/mk_task_user.c
+++ b/arch/um/util/mk_task.c
@@ -1,18 +1,19 @@
 #include <stdio.h>
+#include <kernel-offsets.h>
 
-void print(char *name, char *type, int offset)
+void print_ptr(char *name, char *type, int offset)
 {
-  printf("#define %s(task) *((%s *) &(((char *) (task))[%d]))\n", name, type,
+  printf("#define %s(task) ((%s *) &(((char *) (task))[%d]))\n", name, type,
          offset);
 }
 
-void print_ptr(char *name, char *type, int offset)
+void print(char *name, char *type, int offset)
 {
-  printf("#define %s(task) ((%s *) &(((char *) (task))[%d]))\n", name, type,
+  printf("#define %s(task) *((%s *) &(((char *) (task))[%d]))\n", name, type,
          offset);
 }
 
-void print_head(void)
+int main(int argc, char **argv)
 {
   printf("/*\n");
   printf(" * Generated by mk_task\n");
@@ -21,10 +22,9 @@ void print_head(void)
   printf("#ifndef __TASK_H\n");
   printf("#define __TASK_H\n");
   printf("\n");
-}
-
-void print_tail(void)
-{
+  print_ptr("TASK_REGS", "union uml_pt_regs", TASK_REGS);
+  print("TASK_PID", "int", TASK_PID);
   printf("\n");
   printf("#endif\n");
+  return(0);
 }
diff --git a/arch/um/util/mk_task_kern.c b/arch/um/util/mk_task_kern.c
deleted file mode 100644
index c218103315ed..000000000000
--- a/arch/um/util/mk_task_kern.c
+++ /dev/null
@@ -1,17 +0,0 @@
-#include "linux/sched.h"
-#include "linux/stddef.h"
-
-extern void print(char *name, char *type, int offset);
-extern void print_ptr(char *name, char *type, int offset);
-extern void print_head(void);
-extern void print_tail(void);
-
-int main(int argc, char **argv)
-{
-  print_head();
-  print_ptr("TASK_REGS", "union uml_pt_regs", 
-            offsetof(struct task_struct, thread.regs));
-  print("TASK_PID", "int", offsetof(struct task_struct, pid));
-  print_tail();
-  return(0);
-}