| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <setjmp.h> |
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| 19 | #include <stdlib.h> |
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| 20 | #include "pthreadP.h" |
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| 21 | #include <jmpbuf-unwind.h> |
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| 22 | |
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| 23 | void |
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| 24 | __pthread_cleanup_upto (__jmp_buf target, char *targetframe) |
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| 25 | { |
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| 26 | struct pthread *self = THREAD_SELF; |
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| 27 | struct _pthread_cleanup_buffer *cbuf; |
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| 28 | |
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| 29 | /* Adjust all pointers used in comparisons, so that top of thread's |
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| 30 | stack is at the top of address space. Without that, things break |
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| 31 | if stack is allocated above the main stack. */ |
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| 32 | uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size; |
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| 33 | uintptr_t targetframe_adj = (uintptr_t) targetframe - adj; |
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| 34 | |
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| 35 | for (cbuf = THREAD_GETMEM (self, cleanup); |
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| 36 | cbuf != NULL && _JMPBUF_UNWINDS_ADJ (target, cbuf, adj); |
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| 37 | cbuf = cbuf->__prev) |
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| 38 | { |
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| 39 | #if _STACK_GROWS_DOWN |
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| 40 | if ((uintptr_t) cbuf - adj <= targetframe_adj) |
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| 41 | { |
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| 42 | cbuf = NULL; |
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| 43 | break; |
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| 44 | } |
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| 45 | #elif _STACK_GROWS_UP |
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| 46 | if ((uintptr_t) cbuf - adj >= targetframe_adj) |
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| 47 | { |
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| 48 | cbuf = NULL; |
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| 49 | break; |
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| 50 | } |
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| 51 | #else |
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| 52 | # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP" |
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| 53 | #endif |
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| 54 | |
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| 55 | /* Call the cleanup code. */ |
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| 56 | cbuf->__routine (cbuf->__arg); |
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| 57 | } |
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| 58 | |
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| 59 | THREAD_SETMEM (self, cleanup, cbuf); |
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| 60 | } |
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| 61 | libc_hidden_def (__pthread_cleanup_upto) |
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| 62 | |
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