| 1 | /* Copyright (C) 2001-2024 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 <sigaltstack-offsets.h> |
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| 19 | |
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| 20 | .section .rodata.str1.1,"aMS" ,@progbits,1 |
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| 21 | .type longjmp_msg,@object |
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| 22 | longjmp_msg: |
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| 23 | .string "longjmp causes uninitialized stack frame" |
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| 24 | .size longjmp_msg, .-longjmp_msg |
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| 25 | |
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| 26 | #ifdef PIC |
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| 27 | # define LOAD_MSG lea longjmp_msg(%rip), %RDI_LP |
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| 28 | #else |
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| 29 | # define LOAD_MSG mov $longjmp_msg, %RDI_LP |
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| 30 | #endif |
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| 31 | |
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| 32 | #define CHECK_INVALID_LONGJMP \ |
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| 33 | cmp %R8_LP, %RSP_LP; \ |
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| 34 | jbe .Lok; \ |
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| 35 | /* Save function parameters. */ \ |
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| 36 | movq %rdi, %r10; \ |
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| 37 | cfi_register (%rdi, %r10); \ |
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| 38 | movl %esi, %ebx; \ |
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| 39 | cfi_register (%rsi, %rbx); \ |
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| 40 | xorl %edi, %edi; \ |
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| 41 | lea -sizeSS(%rsp), %RSI_LP; \ |
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| 42 | movl $__NR_sigaltstack, %eax; \ |
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| 43 | syscall; \ |
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| 44 | /* Without working sigaltstack we cannot perform the test. */ \ |
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| 45 | testl %eax, %eax; \ |
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| 46 | jne .Lok2; \ |
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| 47 | testl $1, (-sizeSS + oSS_FLAGS)(%rsp); \ |
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| 48 | jz .Lfail; \ |
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| 49 | mov (-sizeSS + oSS_SP)(%rsp), %RAX_LP; \ |
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| 50 | add (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP; \ |
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| 51 | sub %R8_LP, %RAX_LP; \ |
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| 52 | cmp (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP; \ |
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| 53 | jae .Lok2; \ |
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| 54 | .Lfail: \ |
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| 55 | sub $8, %RSP_LP; \ |
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| 56 | cfi_remember_state; \ |
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| 57 | cfi_def_cfa_offset(16); \ |
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| 58 | LOAD_MSG; \ |
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| 59 | call HIDDEN_JUMPTARGET(__fortify_fail); \ |
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| 60 | cfi_restore_state; \ |
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| 61 | .p2align 3, 5; \ |
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| 62 | .Lok2: \ |
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| 63 | movq %r10, %rdi; \ |
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| 64 | cfi_restore (%rdi); \ |
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| 65 | movl %ebx, %esi; \ |
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| 66 | cfi_restore (%rsi); \ |
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| 67 | .Lok: |
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| 68 | |
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| 69 | #define __longjmp ____longjmp_chk |
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| 70 | #include <__longjmp.S> |
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| 71 | |
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