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/arch/um/kernel/tt/ptproxy/sysdep.c

https://bitbucket.org/evzijst/gittest
C | 70 lines | 47 code | 7 blank | 16 comment | 2 complexity | f129e374a18a2948163d2d8a54b0f6df MD5 | raw file
 1/**********************************************************************
 2sysdep.c
 3
 4Copyright (C) 1999 Lars Brinkhoff.  See the file COPYING for licensing
 5terms and conditions.
 6**********************************************************************/
 7
 8#include <stdio.h>
 9#include <string.h>
10#include <stdlib.h>
11#include <signal.h>
12#include <errno.h>
13#include <sys/types.h>
14#include <linux/unistd.h>
15#include "ptrace_user.h"
16#include "user_util.h"
17#include "user.h"
18
19int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3, long *arg4, 
20		long *arg5)
21{
22	*arg1 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG1_OFFSET, 0);
23	*arg2 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG2_OFFSET, 0);
24	*arg3 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG3_OFFSET, 0);
25	*arg4 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG4_OFFSET, 0);
26	*arg5 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG5_OFFSET, 0);
27	return(ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, 0));
28}
29
30void syscall_cancel(pid_t pid, int result)
31{
32	if((ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
33		   __NR_getpid) < 0) ||
34	   (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) ||
35	   (wait_for_stop(pid, SIGTRAP, PTRACE_SYSCALL, NULL) < 0) ||
36	   (ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result) < 0) ||
37	   (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0))
38		printk("ptproxy: couldn't cancel syscall: errno = %d\n", 
39		       errno);
40}
41
42void syscall_set_result(pid_t pid, long result)
43{
44	ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result);
45}
46
47void syscall_continue(pid_t pid)
48{
49	ptrace(PTRACE_SYSCALL, pid, 0, 0);
50}
51
52int syscall_pause(pid_t pid) 
53{
54	if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_pause) < 0){
55		printk("syscall_change - ptrace failed, errno = %d\n", errno);
56		return(-1);
57	}
58	return(0);
59}
60
61/*
62 * Overrides for Emacs so that we follow Linus's tabbing style.
63 * Emacs will notice this stuff at the end of the file and automatically
64 * adjust the settings for this buffer only.  This must remain at the end
65 * of the file.
66 * ---------------------------------------------------------------------------
67 * Local variables:
68 * c-file-style: "linux"
69 * End:
70 */