| 1 | /* __libc_siglongjmp for Linux/x86 |
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| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdeps/x86/longjmp.c> |
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| 20 | |
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| 21 | #include <pthreadP.h> |
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| 22 | #include <jmp_buf-ssp.h> |
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| 23 | |
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| 24 | #ifdef __x86_64__ |
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| 25 | # define SHADOW_STACK_POINTER_SIZE 8 |
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| 26 | #else |
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| 27 | # define SHADOW_STACK_POINTER_SIZE 4 |
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| 28 | #endif |
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| 29 | |
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| 30 | /* Assert that the priv field in struct pthread_unwind_buf has space |
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| 31 | to store shadow stack pointer. */ |
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| 32 | _Static_assert ((offsetof (struct pthread_unwind_buf, priv) |
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| 33 | <= SHADOW_STACK_POINTER_OFFSET) |
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| 34 | && ((offsetof (struct pthread_unwind_buf, priv) |
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| 35 | + sizeof (((struct pthread_unwind_buf *) 0)->priv)) |
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| 36 | >= (SHADOW_STACK_POINTER_OFFSET |
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| 37 | + SHADOW_STACK_POINTER_SIZE)), |
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| 38 | "Shadow stack pointer is not within private storage " |
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| 39 | "of pthread_unwind_buf." ); |
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| 40 | |
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