projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d614a753 | 1 | /* Copyright (C) 2009-2020 Free Software Foundation, Inc. |
| b8bb339f UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Jakub Jelinek <jakub@redhat.com>. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| b8bb339f UD |
18 | |
| 19 | #include <errno.h> | |
| 20 | #include <sysdep.h> | |
| 21 | #include <setjmp.h> | |
| 22 | #include <bits/setjmp.h> | |
| 23 | #include <stdlib.h> | |
| 24 | #include <unistd.h> | |
| 25 | #include <stdio.h> | |
| 6dfeb524 JJ |
26 | #include <stdint.h> |
| 27 | #include <signal.h> | |
| 28 | #include <sys/syscall.h> | |
| 2f438e20 SL |
29 | |
| 30 | #define __longjmp ____longjmp_chk | |
| b8bb339f UD |
31 | |
| 32 | #define CHECK_SP(env, guard) \ | |
| 33 | do \ | |
| 34 | { \ | |
| 35 | uintptr_t cur_sp; \ | |
| 36 | uintptr_t new_sp = env->__gregs[9]; \ | |
| 31cf3942 | 37 | __asm__ ("lr %0, %%r15" : "=r" (cur_sp)); \ |
| b8bb339f UD |
38 | new_sp ^= guard; \ |
| 39 | if (new_sp < cur_sp) \ | |
| 6dfeb524 JJ |
40 | { \ |
| 41 | stack_t oss; \ | |
| 42 | INTERNAL_SYSCALL_DECL (err); \ | |
| 43 | int res = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss); \ | |
| 44 | if (!INTERNAL_SYSCALL_ERROR_P (res, err)) \ | |
| 45 | { \ | |
| 46 | if ((oss.ss_flags & SS_ONSTACK) == 0 \ | |
| 47 | || ((uintptr_t) (oss.ss_sp + oss.ss_size) - new_sp \ | |
| e3b7670b | 48 | < oss.ss_size)) \ |
| 6dfeb524 JJ |
49 | __fortify_fail ("longjmp causes uninitialized stack frame");\ |
| 50 | } \ | |
| 51 | } \ | |
| b8bb339f UD |
52 | } while (0) |
| 53 | ||
| 2f438e20 | 54 | #include "__longjmp.c" |