Merge branch 'for-linus' from kernel.org:/.../shaggy/jfs-2.6 manually
[linux-2.6] / arch / um / kernel / skas / syscall.c
1 /*
2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #include "linux/sys.h"
7 #include "linux/ptrace.h"
8 #include "asm/errno.h"
9 #include "asm/unistd.h"
10 #include "asm/ptrace.h"
11 #include "asm/current.h"
12 #include "sysdep/syscalls.h"
13 #include "kern_util.h"
14 #include "syscall.h"
15
16 void handle_syscall(union uml_pt_regs *r)
17 {
18         struct pt_regs *regs = container_of(r, struct pt_regs, regs);
19         long result;
20         int syscall;
21 #ifdef UML_CONFIG_SYSCALL_DEBUG
22         int index;
23
24         index = record_syscall_start(UPT_SYSCALL_NR(r));
25 #endif
26         syscall_trace(r, 0);
27
28         current->thread.nsyscalls++;
29         nsyscalls++;
30
31         /* This should go in the declaration of syscall, but when I do that,
32          * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
33          * children at all, sometimes hanging when bash doesn't see the first
34          * ls exit.
35          * The assembly looks functionally the same to me.  This is
36          *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
37          * in case it's a compiler bug.
38          */
39         syscall = UPT_SYSCALL_NR(r);
40         if((syscall >= NR_syscalls) || (syscall < 0))
41                 result = -ENOSYS;
42         else result = EXECUTE_SYSCALL(syscall, regs);
43
44         REGS_SET_SYSCALL_RETURN(r->skas.regs, result);
45
46         syscall_trace(r, 1);
47 #ifdef UML_CONFIG_SYSCALL_DEBUG
48         record_syscall_end(index, result);
49 #endif
50 }