Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 1 | /* |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 6 | #include "linux/kernel.h" |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 7 | #include "linux/ptrace.h" |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 8 | #include "kern_util.h" |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 9 | #include "sysdep/ptrace.h" |
| 10 | #include "sysdep/syscalls.h" |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 11 | |
Jeff Dike | f87ea91 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 12 | extern int syscall_table_size; |
Jan Kiszka | ce60d4d | 2010-04-19 23:53:07 +0200 | [diff] [blame] | 13 | #define NR_SYSCALLS (syscall_table_size / sizeof(void *)) |
Jeff Dike | f87ea91 | 2008-02-04 22:31:29 -0800 | [diff] [blame] | 14 | |
Jeff Dike | 77bf440 | 2007-10-16 01:26:58 -0700 | [diff] [blame] | 15 | void handle_syscall(struct uml_pt_regs *r) |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 16 | { |
| 17 | struct pt_regs *regs = container_of(r, struct pt_regs, regs); |
| 18 | long result; |
| 19 | int syscall; |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 20 | |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 21 | syscall_trace(r, 0); |
| 22 | |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 23 | /* |
| 24 | * This should go in the declaration of syscall, but when I do that, |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 25 | * 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 Kiszka | ce60d4d | 2010-04-19 23:53:07 +0200 | [diff] [blame] | 33 | if ((syscall >= NR_SYSCALLS) || (syscall < 0)) |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 34 | result = -ENOSYS; |
| 35 | else result = EXECUTE_SYSCALL(syscall, regs); |
| 36 | |
Jeff Dike | 18baddd | 2007-10-16 01:27:07 -0700 | [diff] [blame] | 37 | REGS_SET_SYSCALL_RETURN(r->gp, result); |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 38 | |
| 39 | syscall_trace(r, 1); |
Jeff Dike | e32dacb | 2005-09-03 15:57:42 -0700 | [diff] [blame] | 40 | } |