Attachment 212201 Details for Bug 311881 – Standalone C testcase.

Standalone C testcase.

x86_64-running-i386-debugger.c (text/plain), 4.50 KB, created by Jan Kratochvil on 2007-10-01 11:00:43 UTC

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Creator: Jan Kratochvil

Created: 2007-10-01 11:00:43 UTC

Size: 4.50 KB

patch

obsolete

>/* RHEL-5.1 fix: https://bugzilla.redhat.com/show_bug.cgi?id=247427  */
>/* RHEL-4.7?: https://bugzilla.redhat.com/show_bug.cgi?id=311881  */
>/* Fedora fix: https://bugzilla.redhat.com/show_bug.cgi?id=247561  */
>/* F-8 (kernel-2.6.23-0.204.rc8.fc8.x86_64): No bugs.  */
>/* F-7 (kernel-2.6.22.9-91.fc7.x86_64): No bugs.  */
>/* F-6 (kernel-2.6.22.7-57.fc6.x86_64): No bugs.  */
>
>/* This software is provided 'as-is', without any express or implied
>   warranty.  In no event will the authors be held liable for any damages
>   arising from the use of this software.
>   
>   Permission is granted to anyone to use this software for any purpose,
>   including commercial applications, and to alter it and redistribute it
>   freely.  */
>
>#include <pthread.h>
>#include <assert.h>
>#include <unistd.h>
>#include <sys/wait.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <sys/ptrace.h>
>#include <stddef.h>
>#include <errno.h>
>
>#ifndef __i386__
>
>int main (void)
>{
>  /* No #warning "i386 (or x86_64 with -m32) required"
>     as we run with -Werror.   */
>  return 77;
>}
>
>#else	/* __i386__ */
>
>#include <asm/user.h>
>
>static pid_t child;
>
>static void *start (void *arg)
>{
>  for (;;)
>    pause ();
>  /* NOTREACHED */
>  assert (0);
>  return arg;
>}
>
>static void
>cleanup (void)
>{
>  if (child != 0)
>    kill (child, SIGKILL);
>}
>
>static void
>handler_fail (int signo)
>{
>  cleanup ();
>
>  signal (signo, SIG_DFL);
>  raise (signo);
>}
>
>/* Used only for PTRACE_GET_THREAD_AREA.  */
>static int gs_to_idx (int gs)
>{
>  switch (gs)
>    {
>      case 0x33:
>	return 6;
>	/* NOTREACHED */
>      case 0x63:
>	return 12;
>	/* NOTREACHED */
>    }
>  assert (0);
>  /* NOTREACHED */
>}
>
>static unsigned short local_get_gs (void)
>{
>  unsigned short gs;
>
>  __asm__ __volatile__ ("movw %%gs, %0" : "=r" (gs));
>
>  return gs;
>}
>
>int main (void)
>{
>  pthread_t thread1;
>  pid_t got_pid;
>  int i, status;
>  long l;
>  long debugreg0_orig, gs_orig;
>  long debugreg0_new, gs_new;
>  unsigned int desc[4];
>  unsigned thread_area_orig;
>  unsigned thread_area_new;
>
>  atexit (cleanup);
>  signal (SIGABRT, handler_fail);
>  signal (SIGINT, handler_fail);
>
>  child = fork ();
>  switch (child)
>    {
>      case -1:
>        assert (0);
>      case 0:
>	i = pthread_create (&thread1, NULL, start, NULL);	/* create1 */
>	assert (i == 0);
>
>	/* Sanity check libpthread really set our local %gs.  */
>	assert (local_get_gs () != 0);
>
>	l = ptrace (PTRACE_TRACEME, 0, NULL, NULL);
>	assert (l == 0);
>
>	i = raise (SIGUSR1);
>	assert (i == 0);
>
>	for (;;)
>	  pause ();
>	/* NOTREACHED */
>	assert (0);
>      default:
>        break;
>    }
>
>  got_pid = waitpid (child, &status, 0);
>  assert (got_pid == child);
>  assert (WIFSTOPPED (status));
>  assert (WSTOPSIG (status) == SIGUSR1);
>
>  debugreg0_orig = ptrace (PTRACE_PEEKUSER, child, (void *) (offsetof (struct user, u_debugreg[0])), NULL);
>#if 0
>  printf ("u_debugreg[0] == 0x%lx\n", debugreg0_orig);
>#endif
>  assert (debugreg0_orig == 0);
>  gs_orig = ptrace (PTRACE_PEEKUSER, child, (void *) (offsetof (struct user, regs.gs)), NULL);
>#if 0
>  printf ("gs == 0x%lx\n", gs_orig);
>#endif
>  /* FIXME: RHEL-4.6 x86_64 fails here.  If CHILD's %gs would be 0 we would not
>     earlier pass the CHILD's LOCAL_GET_GS assertion above.  */
>  assert (gs_orig != 0);
>/* Its definition location varies.  */
>#ifndef PTRACE_GET_THREAD_AREA
>#define PTRACE_GET_THREAD_AREA 25
>#endif
>  l = ptrace (PTRACE_GET_THREAD_AREA, child, (void *) gs_to_idx (gs_orig), &desc);
>  assert (l == 0);
>  thread_area_orig = desc[1];
>#if 0
>  printf ("thread_area == 0x%x\n", thread_area_orig);
>#endif
>
>#if 0
>  printf ("u_debugreg[0] = 0x01010101\n");
>#endif
>  l = ptrace (PTRACE_POKEUSER, child, (void *) (offsetof (struct user, u_debugreg[0])), (void *) 0x01010101);
>  assert (l == 0);
>#if 0	/* Disallowed.  */
>  printf ("gs = 0x02020202\n");
>  l = ptrace (PTRACE_POKEUSER, child, (void *) (offsetof (struct user, regs.gs)), (void *) 0x02020202);
>  assert (l == 0);
>#endif
>
>  debugreg0_new = ptrace (PTRACE_PEEKUSER, child, (void *) (offsetof (struct user, u_debugreg[0])), NULL);
>#if 0
>  printf ("u_debugreg[0] == 0x%lx\n", debugreg0_new);
>#endif
>  gs_new = ptrace (PTRACE_PEEKUSER, child, (void *) (offsetof (struct user, regs.gs)), NULL);
>#if 0
>  printf ("gs == 0x%lx\n", gs_new);
>#endif
>  l = ptrace (PTRACE_GET_THREAD_AREA, child, (void *) gs_to_idx (gs_orig), &desc);
>  assert (l == 0);
>  thread_area_new = desc[1];
>#if 0
>  printf ("thread_area == 0x%x\n", thread_area_new);
>#endif
>
>  assert (gs_new == gs_orig);
>  assert (debugreg0_new == 0x01010101);
>  assert (thread_area_new == thread_area_orig);
>
>#if 0
>  puts ("PASS");
>#endif
>  return 0;
>}
>
>#endif	/* __i386__ */

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Attachments on bug 311881: 211021 | 212201