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
16void 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
22	syscall_trace(r, 0);
23
24	current->thread.nsyscalls++;
25	nsyscalls++;
26
27	/* This should go in the declaration of syscall, but when I do that,
28	 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
29	 * children at all, sometimes hanging when bash doesn't see the first
30	 * ls exit.
31	 * The assembly looks functionally the same to me.  This is
32	 *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
33	 * in case it's a compiler bug.
34	 */
35	syscall = UPT_SYSCALL_NR(r);
36	if((syscall >= NR_syscalls) || (syscall < 0))
37		result = -ENOSYS;
38	else result = EXECUTE_SYSCALL(syscall, regs);
39
40	REGS_SET_SYSCALL_RETURN(r->skas.regs, result);
41
42	syscall_trace(r, 1);
43}
44