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

   1 /**********************************************************************
   2 sysdep.c
   3
   4 Copyright (C) 1999 Lars Brinkhoff.  See the file COPYING for licensing
   5 terms 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 #include "os.h"
  19
  20 int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3, long *arg4,
  21                 long *arg5)
  22 {
  23         *arg1 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG1_OFFSET, 0);
  24         *arg2 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG2_OFFSET, 0);
  25         *arg3 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG3_OFFSET, 0);
  26         *arg4 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG4_OFFSET, 0);
  27         *arg5 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG5_OFFSET, 0);
  28         return(ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, 0));
  29 }
  30
  31 void syscall_cancel(pid_t pid, int result)
  32 {
  33         if((ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
  34                    __NR_getpid) < 0) ||
  35            (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) ||
  36            (wait_for_stop(pid, SIGTRAP, PTRACE_SYSCALL, NULL) < 0) ||
  37            (ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result) < 0) ||
  38            (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0))
  39                 printk("ptproxy: couldn't cancel syscall: errno = %d\n",
  40                        errno);
  41 }
  42
  43 void syscall_set_result(pid_t pid, long result)
  44 {
  45         ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result);
  46 }
  47
  48 void syscall_continue(pid_t pid)
  49 {
  50         ptrace(PTRACE_SYSCALL, pid, 0, 0);
  51 }
  52
  53 int syscall_pause(pid_t pid)
  54 {
  55         if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_pause) < 0){
  56                 printk("syscall_change - ptrace failed, errno = %d\n", errno);
  57                 return(-1);
  58         }
  59         return(0);
  60 }
  61
  62 /*
  63  * Overrides for Emacs so that we follow Linus's tabbing style.
  64  * Emacs will notice this stuff at the end of the file and automatically
  65  * adjust the settings for this buffer only.  This must remain at the end
  66  * of the file.
  67  * ---------------------------------------------------------------------------
  68  * Local variables:
  69  * c-file-style: "linux"
  70  * End:
  71  */