projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| a63c7fa1 CM |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
| 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 | |
| ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| a63c7fa1 CM |
18 | |
| 19 | #include <jmpbuf-offsets.h> | |
| 20 | #include <sysdep.h> | |
| 21 | #include <setjmp.h> | |
| 22 | #include <signal.h> | |
| 23 | #include <stdio.h> | |
| 24 | #include <stackinfo.h> | |
| 25 | ||
| 26 | #ifdef _STACK_GROWS_DOWN | |
| 27 | #define called_from(this, saved) ((this) < (saved)) | |
| 28 | #else | |
| 29 | #define called_from(this, saved) ((this) > (saved)) | |
| 30 | #endif | |
| 31 | ||
| 32 | extern void ____longjmp_chk (__jmp_buf __env, int __val) | |
| 33 | __attribute__ ((__noreturn__)); | |
| 34 | ||
| 35 | void ____longjmp_chk (__jmp_buf env, int val) | |
| 36 | { | |
| 37 | void *this_frame = __builtin_frame_address (0); | |
| 38 | void *saved_frame = JB_FRAME_ADDRESS (env); | |
| 39 | INTERNAL_SYSCALL_DECL (err); | |
| 40 | stack_t ss; | |
| 41 | ||
| 42 | /* If "env" is from a frame that called us, we're all set. */ | |
| 43 | if (called_from(this_frame, saved_frame)) | |
| 44 | __longjmp (env, val); | |
| 45 | ||
| 46 | /* If we can't get the current stack state, give up and do the longjmp. */ | |
| 47 | if (INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &ss) != 0) | |
| 48 | __longjmp (env, val); | |
| 49 | ||
| 50 | /* If we we are executing on the alternate stack and within the | |
| 51 | bounds, do the longjmp. */ | |
| 52 | if (ss.ss_flags == SS_ONSTACK && | |
| 53 | (this_frame >= ss.ss_sp && this_frame < (ss.ss_sp + ss.ss_size))) | |
| 54 | __longjmp (env, val); | |
| 55 | ||
| 56 | __fortify_fail ("longjmp causes uninitialized stack frame"); | |
| 57 | } |