[PATCH] uml: move libc-dependent code from trap_user.c

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from trap_user.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

13 files changed, 123 insertions, 91 deletions

diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index 58c0b10fcf2d..8f4e46d677ab 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -10,6 +10,19 @@
 #include "sysdep/ptrace.h"
 #include "sysdep/faultinfo.h"
 
+typedef void (*kern_hndl)(int, union uml_pt_regs *);
+
+struct kern_handlers {
+        kern_hndl relay_signal;
+        kern_hndl winch;
+        kern_hndl bus_handler;
+        kern_hndl page_fault;
+        kern_hndl sigio_handler;
+        kern_hndl timer_handler;
+};
+
+extern struct kern_handlers handlinfo_kern;
+
 extern int ncpus;
 extern char *linux_prog;
 extern char *gdb_init;
@@ -109,6 +122,8 @@ extern void arch_switch(void);
 extern void free_irq(unsigned int, void *);
 extern int um_in_interrupt(void);
 extern int cpu(void);
+extern void segv_handler(int sig, union uml_pt_regs *regs);
+extern void sigio_handler(int sig, union uml_pt_regs *regs);
 
 #endif
 
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index cfc806e4610b..dd72d66cf0ed 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -9,6 +9,8 @@
 #include "uml-config.h"
 #include "asm/types.h"
 #include "../os/include/file.h"
+#include "sysdep/ptrace.h"
+#include "kern_util.h"
 
 #define OS_TYPE_FILE 1 
 #define OS_TYPE_DIR 2 
@@ -229,4 +231,8 @@ extern void unblock_signals(void);
 extern int get_signals(void);
 extern int set_signals(int enable);
 
+/* trap.c */
+extern void os_fill_handlinfo(struct kern_handlers h);
+extern void do_longjmp(void *p, int val);
+
 #endif
diff --git a/arch/um/include/user_util.h b/arch/um/include/user_util.h
index b9984003e603..c1dbd77b073f 100644
--- a/arch/um/include/user_util.h
+++ b/arch/um/include/user_util.h
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -23,12 +23,7 @@ struct cpu_task {
 
 extern struct cpu_task cpu_tasks[];
 
-struct signal_info {
-        void (*handler)(int, union uml_pt_regs *);
-        int is_irq;
-};
-
-extern struct signal_info sig_info[];
+extern void (*sig_info[])(int, union uml_pt_regs *);
 
 extern unsigned long low_physmem;
 extern unsigned long high_physmem;
@@ -64,7 +59,6 @@ extern void setup_machinename(char *machine_out);
 extern void setup_hostinfo(void);
 extern void do_exec(int old_pid, int new_pid);
 extern void tracer_panic(char *msg, ...);
-extern void do_longjmp(void *p, int val);
 extern int detach(int pid, int sig);
 extern int attach(int pid);
 extern void kill_child_dead(int pid);
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index 8de471b59c1c..7a9fc16d71d4 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -4,7 +4,7 @@
 #
 
 obj-y := clone.o exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \
-        syscall.o tlb.o trap_user.o uaccess.o
+        syscall.o tlb.o uaccess.o
 
 USER_OBJS := process.o clone.o
 
diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
index 0d4c10a73607..b79f805bdc00 100644
--- a/arch/um/kernel/trap_kern.c
+++ b/arch/um/kernel/trap_kern.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -29,6 +29,7 @@
 #ifdef CONFIG_MODE_SKAS
 #include "skas.h"
 #endif
+#include "os.h"
 
 /* Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by segv(). */
 int handle_page_fault(unsigned long address, unsigned long ip, 
@@ -125,6 +126,14 @@ out_of_memory:
         goto out;
 }
 
+struct kern_handlers handlinfo_kern = {
+        .relay_signal = relay_signal,
+        .winch = winch,
+        .bus_handler = relay_signal,
+        .page_fault = segv_handler,
+        .sigio_handler = sigio_handler,
+        .timer_handler = timer_handler
+};
 /*
  * We give a *copy* of the faultinfo in the regs to segv.
  * This must be done, since nesting SEGVs could overwrite
diff --git a/arch/um/kernel/trap_user.c b/arch/um/kernel/trap_user.c
index e55110725124..5590b5739db9 100644
--- a/arch/um/kernel/trap_user.c
+++ b/arch/um/kernel/trap_user.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -25,20 +25,6 @@
 #include "user_util.h"
 #include "os.h"
 
-void kill_child_dead(int pid)
-{
-        kill(pid, SIGKILL);
-        kill(pid, SIGCONT);
-        do {
-                int n;
-                CATCH_EINTR(n = waitpid(pid, NULL, 0));
-                if (n > 0)
-                        kill(pid, SIGCONT);
-                else
-                        break;
-        } while(1);
-}
-
 void segv_handler(int sig, union uml_pt_regs *regs)
 {
         struct faultinfo * fi = UPT_FAULTINFO(regs);
@@ -55,43 +41,18 @@ void usr2_handler(int sig, union uml_pt_regs *regs)
         CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
 }
 
-struct signal_info sig_info[] = {
-        [ SIGTRAP ] { .handler          = relay_signal,
-                      .is_irq           = 0 },
-        [ SIGFPE ] { .handler           = relay_signal,
-                     .is_irq            = 0 },
-        [ SIGILL ] { .handler           = relay_signal,
-                     .is_irq            = 0 },
-        [ SIGWINCH ] { .handler         = winch,
-                       .is_irq          = 1 },
-        [ SIGBUS ] { .handler           = bus_handler,
-                     .is_irq            = 0 },
-        [ SIGSEGV] { .handler           = segv_handler,
-                     .is_irq            = 0 },
-        [ SIGIO ] { .handler            = sigio_handler,
-                    .is_irq             = 1 },
-        [ SIGVTALRM ] { .handler        = timer_handler,
-                        .is_irq         = 1 },
-        [ SIGALRM ] { .handler          = timer_handler,
-                      .is_irq           = 1 },
-        [ SIGUSR2 ] { .handler          = usr2_handler,
-                      .is_irq           = 0 },
-};
+void (*sig_info[NSIG])(int, union uml_pt_regs *);
 
-void do_longjmp(void *b, int val)
+void os_fill_handlinfo(struct kern_handlers h)
 {
-        sigjmp_buf *buf = b;
-
-        siglongjmp(*buf, val);
+        sig_info[SIGTRAP] = h.relay_signal;
+        sig_info[SIGFPE] = h.relay_signal;
+        sig_info[SIGILL] = h.relay_signal;
+        sig_info[SIGWINCH] = h.winch;
+        sig_info[SIGBUS] = h.bus_handler;
+        sig_info[SIGSEGV] = h.page_fault;
+        sig_info[SIGIO] = h.sigio_handler;
+        sig_info[SIGVTALRM] = h.timer_handler;
+        sig_info[SIGALRM] = h.timer_handler;
+        sig_info[SIGUSR2] = usr2_handler;
 }
-
-/*
- * 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/tt/trap_user.c b/arch/um/kernel/tt/trap_user.c
index 7501900f8941..a414c529fbcd 100644
--- a/arch/um/kernel/tt/trap_user.c
+++ b/arch/um/kernel/tt/trap_user.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -18,8 +18,8 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
 {
         struct sigcontext *sc = sc_ptr;
         struct tt_regs save_regs, *r;
-        struct signal_info *info;
         int save_errno = errno, is_user;
+        void (*handler)(int, union uml_pt_regs *);
 
         /* This is done because to allow SIGSEGV to be delivered inside a SEGV
          * handler.  This can happen in copy_user, and if SEGV is disabled,
@@ -40,10 +40,14 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
         if(sig != SIGUSR2) 
                 r->syscall = -1;
 
-        info = &sig_info[sig];
-        if(!info->is_irq) unblock_signals();
+        handler = sig_info[sig];
+
+        /* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
+        if (sig != SIGIO && sig != SIGWINCH &&
+            sig != SIGVTALRM && sig != SIGALRM)
+                unblock_signals();
 
-        (*info->handler)(sig, (union uml_pt_regs *) r);
+        handler(sig, (union uml_pt_regs *) r);
 
         if(is_user){
                 interrupt_end();
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index 26626b2b9172..73747ac19774 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
  * Licensed under the GPL
  */
@@ -363,6 +363,11 @@ int linux_main(int argc, char **argv)
         uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
                                      &host_task_size, &task_size);
 
+        /*
+         * Setting up handlers to 'sig_info' struct
+         */
+        os_fill_handlinfo(handlinfo_kern);
+
         brk_start = (unsigned long) sbrk(0);
         CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
         /* Increase physical memory size for exec-shield users
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile
index 11e30b13e318..40c7d6b1df68 100644
--- a/arch/um/os-Linux/Makefile
+++ b/arch/um/os-Linux/Makefile
@@ -4,11 +4,13 @@
 #
 
 obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
-        start_up.o time.o tt.o tty.o uaccess.o umid.o user_syms.o drivers/ \
-        sys-$(SUBARCH)/
+        start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o user_syms.o \
+        drivers/ sys-$(SUBARCH)/
+
+obj-$(CONFIG_MODE_SKAS) += skas/
 
 USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
-        start_up.o time.o tt.o tty.o uaccess.o umid.o
+        start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o
 
 elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
 CFLAGS_elf_aux.o += -I$(objtree)/arch/um
diff --git a/arch/um/os-Linux/skas/Makefile b/arch/um/os-Linux/skas/Makefile
new file mode 100644
index 000000000000..eab5386d60a7
--- /dev/null
+++ b/arch/um/os-Linux/skas/Makefile
@@ -0,0 +1,10 @@
+#
+# Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com)
+# Licensed under the GPL
+#
+
+obj-y := trap.o
+
+USER_OBJS := trap.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/trap_user.c b/arch/um/os-Linux/skas/trap.c
index 28403d2cafe6..818f30e9004f 100644
--- a/arch/um/kernel/skas/trap_user.c
+++ b/arch/um/os-Linux/skas/trap.c
@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
  * Licensed under the GPL
  */
@@ -19,7 +19,7 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
 {
         struct sigcontext *sc = sc_ptr;
         struct skas_regs *r;
-        struct signal_info *info;
+        void (*handler)(int, union uml_pt_regs *);
         int save_errno = errno;
         int save_user;
 
@@ -41,10 +41,15 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
         }
 
         change_sig(SIGUSR1, 1);
-        info = &sig_info[sig];
-        if(!info->is_irq) unblock_signals();
 
-        (*info->handler)(sig, (union uml_pt_regs *) r);
+        handler = sig_info[sig];
+
+        /* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
+        if (sig != SIGIO && sig != SIGWINCH &&
+            sig != SIGVTALRM && sig != SIGALRM)
+                unblock_signals();
+
+        handler(sig, (union uml_pt_regs *) r);
 
         errno = save_errno;
         r->is_user = save_user;
@@ -54,25 +59,15 @@ extern int ptrace_faultinfo;
 
 void user_signal(int sig, union uml_pt_regs *regs, int pid)
 {
-        struct signal_info *info;
+        void (*handler)(int, union uml_pt_regs *);
         int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
                     (sig == SIGILL) || (sig == SIGTRAP));
 
         if (segv)
                 get_skas_faultinfo(pid, &regs->skas.faultinfo);
-        info = &sig_info[sig];
-        (*info->handler)(sig, regs);
+
+        handler = sig_info[sig];
+        handler(sig, (union uml_pt_regs *) regs);
 
         unblock_signals();
 }
-
-/*
- * 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/os-Linux/trap.c b/arch/um/os-Linux/trap.c
new file mode 100644
index 000000000000..6e7841c23d26
--- /dev/null
+++ b/arch/um/os-Linux/trap.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <signal.h>
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+
+void do_longjmp(void *b, int val)
+{
+        sigjmp_buf *buf = b;
+
+        siglongjmp(*buf, val);
+}
diff --git a/arch/um/os-Linux/tt.c b/arch/um/os-Linux/tt.c
index 37828e5b3526..cb2648b79d0f 100644
--- a/arch/um/os-Linux/tt.c
+++ b/arch/um/os-Linux/tt.c
@@ -49,6 +49,20 @@ int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
         return(0);
 }
 
+void kill_child_dead(int pid)
+{
+        kill(pid, SIGKILL);
+        kill(pid, SIGCONT);
+        do {
+                int n;
+                CATCH_EINTR(n = waitpid(pid, NULL, 0));
+                if (n > 0)
+                        kill(pid, SIGCONT);
+                else
+                        break;
+        } while(1);
+}
+
 /*
  *-------------------------
  * only for tt mode (will be deleted in future...)