1 /* Copyright (C) 2001-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include <pointer_guard.h>
20 #include <jmpbuf-offsets.h>
21 #include <asm-syntax.h>
22 #include <stap-probe.h>
25 .section .rodata.str1.1,"aMS",@progbits,1
26 .type longjmp_msg,@object
28 .string "longjmp causes uninitialized stack frame"
29 .size longjmp_msg, .-longjmp_msg
33 # define CALL_FAIL movl %ebx, %ecx; \
34 cfi_register(%ebx,%ecx); \
36 leal longjmp_msg@GOTOFF(%ebx), %eax; \
38 call HIDDEN_JUMPTARGET(__fortify_fail)
40 # define CALL_FAIL movl $longjmp_msg, %eax; \
42 call HIDDEN_JUMPTARGET(__fortify_fail)
47 ENTRY (____longjmp_chk)
48 movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
50 /* Save the return address now. */
51 movl (JB_PC*4)(%ecx), %edx
52 /* Get the stack pointer. */
53 movl (JB_SP*4)(%ecx), %edi
62 cfi_adjust_cfa_offset(12)
65 movl $__NR_sigaltstack, %eax
67 /* Without working sigaltstack we cannot perform the test. */
82 cfi_adjust_cfa_offset(-12)
86 LIBC_PROBE (longjmp, 3, 4@%ecx, -4@8(%esp), 4@%edx)
87 /* We add unwind information for the target here. */
89 cfi_register(%eip, %edx)
90 cfi_register(%esp, %edi)
91 cfi_offset(%ebx, JB_BX*4)
92 cfi_offset(%esi, JB_SI*4)
93 cfi_offset(%edi, JB_DI*4)
94 cfi_offset(%ebp, JB_BP*4)
96 movl 8(%esp), %eax /* Second argument is return value. */
99 /* Restore registers. */
100 movl (JB_BX*4)(%ecx), %ebx
101 movl (JB_SI*4)(%ecx), %esi
102 movl (JB_DI*4)(%ecx), %edi
103 movl (JB_BP*4)(%ecx), %ebp
109 /* Jump to saved PC. */
110 LIBC_PROBE (longjmp_target, 3, 4@%ecx, -4@%eax, 4@%edx)
112 END (____longjmp_chk)