25 files changed, 222 insertions, 115 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 53eb5cfd5b63..848bb97af7ca 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -650,7 +650,7 @@ acpi_find_rsdp (void)
          */
         rsdp_phys = acpi_scan_rsdp (0, 0x400);
         if (!rsdp_phys)
-                rsdp_phys = acpi_scan_rsdp (0xE0000, 0xFFFFF);
+                rsdp_phys = acpi_scan_rsdp (0xE0000, 0x20000);
 
         return rsdp_phys;
 }
diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index d0d94e56b90b..600f23d7fd33 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -77,9 +77,11 @@ config 44x
         bool "44x"
 
 config POWER3
+        select PPC_FPU
         bool "POWER3"
 
 config POWER4
+        select PPC_FPU
         bool "POWER4 and 970 (G5)"
 
 config 8xx
diff --git a/arch/ppc64/Kconfig b/arch/ppc64/Kconfig
index 257ff66d83cf..5cb343883e4d 100644
--- a/arch/ppc64/Kconfig
+++ b/arch/ppc64/Kconfig
@@ -262,6 +262,7 @@ config PPC_RTAS
 config RTAS_PROC
         bool "Proc interface to RTAS"
         depends on PPC_RTAS
+        default y
 
 config RTAS_FLASH
         tristate "Firmware flash interface"
diff --git a/arch/um/include/user_util.h b/arch/um/include/user_util.h
index 103cd320386c..b8c5b8a95250 100644
--- a/arch/um/include/user_util.h
+++ b/arch/um/include/user_util.h
@@ -67,7 +67,6 @@ 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 dca654263857..9736ca27c5f0 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -23,14 +23,10 @@ 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
 
diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index 7a943696f950..c1adf7ba3fd1 100644
--- a/arch/um/kernel/process_kern.c
+++ b/arch/um/kernel/process_kern.c
@@ -115,16 +115,6 @@ 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 +142,6 @@ 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);
 }
  
@@ -476,12 +465,21 @@ 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;
 }
+#endif
 
 
 /*
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 3efa59a941a4..2b75d8d9ba73 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;
@@ -87,28 +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);
-                }
-#if defined(CONFIG_UML_X86) && !defined(CONFIG_64BIT)
-                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
-                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. */
@@ -121,26 +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 defined(CONFIG_UML_X86) && !defined(CONFIG_64BIT)
-                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. */
@@ -148,8 +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);
                 }
@@ -172,8 +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;
@@ -184,8 +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);
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/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 4dc13bc8cfd8..773cd2b525fc 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -201,6 +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))
@@ -236,7 +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)
@@ -266,21 +271,25 @@ int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
 
         *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);
 }
@@ -305,7 +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;
@@ -316,13 +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..ab5d3271da0b 100644
--- a/arch/um/kernel/skas/process_kern.c
+++ b/arch/um/kernel/skas/process_kern.c
@@ -83,10 +83,6 @@ void release_thread_skas(struct task_struct *task)
 {
 }
 
-void exit_thread_skas(void)
-{
-}
-
 void fork_handler(int sig)
 {
         change_sig(SIGUSR1, 1);
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/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/trap_kern.c b/arch/um/kernel/trap_kern.c
index 54e2ec33a43c..5fca2c61eb98 100644
--- a/arch/um/kernel/trap_kern.c
+++ b/arch/um/kernel/trap_kern.c
@@ -48,7 +48,7 @@ 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;
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/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..df810ca8fc12 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -65,8 +65,7 @@ void *switch_to_tt(void *prev, void *next, void *last)
                 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 +80,7 @@ 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 +99,18 @@ 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/um_arch.c b/arch/um/kernel/um_arch.c
index 5c49d88eed3d..4d10ec372a67 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -23,6 +23,7 @@
 #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"
@@ -42,9 +43,9 @@
 #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");
@@ -449,7 +450,7 @@ 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/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-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-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index 8c146b2a1e00..b593bb256f2c 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -62,6 +62,27 @@ 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 +105,29 @@ 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 b740177066a0..73a7926f7370 100644
--- a/arch/um/sys-x86_64/signal.c
+++ b/arch/um/sys-x86_64/signal.c
@@ -168,7 +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 2a575ef52bba..dd9914642b8e 100644
--- a/arch/um/sys-x86_64/syscalls.c
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -44,6 +44,8 @@ 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;