mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* This testcase is part of GDB, the GNU debugger.
|
|
|
|
Copyright 2014-2018 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <sys/mman.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
|
|
void *global_invalid_ptr = NULL;
|
|
|
|
void
|
|
func2 (void)
|
|
{
|
|
/* Replace the current stack pointer and frame pointer with the invalid
|
|
pointer. */
|
|
asm ("mov %0, %%rsp\n\tmov %0, %%rbp" : : "r" (global_invalid_ptr));
|
|
|
|
/* Create a label for a breakpoint. */
|
|
asm (".global breakpt\nbreakpt:");
|
|
}
|
|
|
|
void
|
|
func1 (void *ptr)
|
|
{
|
|
global_invalid_ptr = ptr;
|
|
func2 ();
|
|
}
|
|
|
|
/* Finds and returns an invalid pointer, mmaps in a page, grabs a pointer
|
|
to it then unmaps the page again. This is almost certainly "undefined"
|
|
behaviour, but should be good enough for this small test program. */
|
|
|
|
static void *
|
|
make_invalid_ptr (void)
|
|
{
|
|
int page_size, ans;
|
|
void *ptr;
|
|
|
|
page_size = getpagesize ();
|
|
ptr = mmap (0, page_size, PROT_NONE,
|
|
MAP_PRIVATE | MAP_ANONYMOUS,
|
|
-1, 0);
|
|
assert (ptr != MAP_FAILED);
|
|
ans = munmap (ptr, page_size);
|
|
assert (ans == 0);
|
|
|
|
return ptr;
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
void *invalid_ptr;
|
|
|
|
invalid_ptr = make_invalid_ptr ();
|
|
func1 (invalid_ptr);
|
|
|
|
return 0;
|
|
}
|