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/**********************************************************************
sysdep.c
Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
terms and conditions.
**********************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <linux/unistd.h>
#include "ptrace_user.h"
#include "user_util.h"
#include "user.h"
#include "os.h"
int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3, long *arg4,
long *arg5)
{
*arg1 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG1_OFFSET, 0);
*arg2 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG2_OFFSET, 0);
*arg3 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG3_OFFSET, 0);
*arg4 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG4_OFFSET, 0);
*arg5 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG5_OFFSET, 0);
return(ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, 0));
}
void syscall_cancel(pid_t pid, int result)
{
if((ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
__NR_getpid) < 0) ||
(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) ||
(wait_for_stop(pid, SIGTRAP, PTRACE_SYSCALL, NULL) < 0) ||
(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result) < 0) ||
(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0))
printk("ptproxy: couldn't cancel syscall: errno = %d\n",
errno);
}
void syscall_set_result(pid_t pid, long result)
{
ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result);
}
void syscall_continue(pid_t pid)
{
ptrace(PTRACE_SYSCALL, pid, 0, 0);
}
int syscall_pause(pid_t pid)
{
if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_pause) < 0){
printk("syscall_change - ptrace failed, errno = %d\n", errno);
return(-1);
}
return(0);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
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