diff options
Diffstat (limited to 'gdb/testsuite/gdb.arch/amd64-invalid-stack-top.c')
-rw-r--r-- | gdb/testsuite/gdb.arch/amd64-invalid-stack-top.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.arch/amd64-invalid-stack-top.c b/gdb/testsuite/gdb.arch/amd64-invalid-stack-top.c new file mode 100644 index 0000000..168dc55 --- /dev/null +++ b/gdb/testsuite/gdb.arch/amd64-invalid-stack-top.c @@ -0,0 +1,73 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2014 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; +} |