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