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Jeff Dikee32dacb2005-09-03 15:57:42 -07001/*
Jeff Dikeba180fd2007-10-16 01:27:00 -07002 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
Jeff Dikee32dacb2005-09-03 15:57:42 -07003 * Licensed under the GPL
4 */
5
Jeff Dikeba180fd2007-10-16 01:27:00 -07006#include "linux/kernel.h"
Jeff Dikee32dacb2005-09-03 15:57:42 -07007#include "linux/ptrace.h"
Jeff Dikee32dacb2005-09-03 15:57:42 -07008#include "kern_util.h"
Jeff Dikeba180fd2007-10-16 01:27:00 -07009#include "sysdep/ptrace.h"
10#include "sysdep/syscalls.h"
Jeff Dikee32dacb2005-09-03 15:57:42 -070011
Jeff Dikef87ea912008-02-04 22:31:29 -080012extern int syscall_table_size;
Jan Kiszkace60d4d2010-04-19 23:53:07 +020013#define NR_SYSCALLS (syscall_table_size / sizeof(void *))
Jeff Dikef87ea912008-02-04 22:31:29 -080014
Jeff Dike77bf4402007-10-16 01:26:58 -070015void handle_syscall(struct uml_pt_regs *r)
Jeff Dikee32dacb2005-09-03 15:57:42 -070016{
17 struct pt_regs *regs = container_of(r, struct pt_regs, regs);
18 long result;
19 int syscall;
Jeff Dikee32dacb2005-09-03 15:57:42 -070020
Jeff Dikee32dacb2005-09-03 15:57:42 -070021 syscall_trace(r, 0);
22
Jeff Dikeba180fd2007-10-16 01:27:00 -070023 /*
24 * This should go in the declaration of syscall, but when I do that,
Jeff Dikee32dacb2005-09-03 15:57:42 -070025 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
26 * children at all, sometimes hanging when bash doesn't see the first
27 * ls exit.
28 * The assembly looks functionally the same to me. This is
29 * gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
30 * in case it's a compiler bug.
31 */
32 syscall = UPT_SYSCALL_NR(r);
Jan Kiszkace60d4d2010-04-19 23:53:07 +020033 if ((syscall >= NR_SYSCALLS) || (syscall < 0))
Jeff Dikee32dacb2005-09-03 15:57:42 -070034 result = -ENOSYS;
35 else result = EXECUTE_SYSCALL(syscall, regs);
36
Jeff Dike18baddd2007-10-16 01:27:07 -070037 REGS_SET_SYSCALL_RETURN(r->gp, result);
Jeff Dikee32dacb2005-09-03 15:57:42 -070038
39 syscall_trace(r, 1);
Jeff Dikee32dacb2005-09-03 15:57:42 -070040}