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| 1 | /* Copyright (C) 2003-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <setjmp.h> |
| 19 | #include <stdint.h> |
| 20 | #include <unwind.h> |
| 21 | |
| 22 | /* Test if longjmp to JMPBUF would unwind the frame containing a local |
| 23 | variable at ADDRESS. */ |
| 24 | #define _JMPBUF_UNWINDS(_jmpbuf, _address, _demangle) \ |
| 25 | ((void *) (_address) < (void *) (((long int *) _jmpbuf)[0])) |
| 26 | |
| 27 | #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \ |
| 28 | ({ uintptr_t _cfa = (uintptr_t) _Unwind_GetCFA (_context) - (_adj); \ |
| 29 | (_cfa < (uintptr_t)(((long *)(_jmpbuf))[0]) - (_adj) \ |
| 30 | || (_cfa == (uintptr_t)(((long *)(_jmpbuf))[0]) - (_adj) \ |
| 31 | && (uintptr_t) _Unwind_GetBSP (_context) - (_adj) \ |
| 32 | >= (uintptr_t)(((long *)(_jmpbuf))[17]) - (_adj))); \ |
| 33 | }) |
| 34 | |
| 35 | #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \ |
| 36 | ((uintptr_t)(_address) - (_adj) < (uintptr_t)(((long *)_jmpbuf)[0]) - (_adj)) |
| 37 | |
| 38 | /* We use a longjmp() which can cross from the alternate signal-stack |
| 39 | to the normal stack. */ |
| 40 | extern void __libc_unwind_longjmp (sigjmp_buf env, int val) |
| 41 | __attribute__ ((noreturn)); |
| 42 | hidden_proto (__libc_unwind_longjmp) |
| 43 |
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