| 1 | /* longjmp for i386. |
|---|
| 2 | Copyright (C) 1995-2024 Free Software Foundation, Inc. |
|---|
| 3 | This file is part of the GNU C Library. |
|---|
| 4 | |
|---|
| 5 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 6 | modify it under the terms of the GNU Lesser General Public |
|---|
| 7 | License as published by the Free Software Foundation; either |
|---|
| 8 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 9 | |
|---|
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 13 | Lesser General Public License for more details. |
|---|
| 14 | |
|---|
| 15 | You should have received a copy of the GNU Lesser General Public |
|---|
| 16 | License along with the GNU C Library; if not, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #include <sysdep.h> |
|---|
| 20 | #include <pointer_guard.h> |
|---|
| 21 | #include <jmpbuf-offsets.h> |
|---|
| 22 | #include <asm-syntax.h> |
|---|
| 23 | #include <stap-probe.h> |
|---|
| 24 | |
|---|
| 25 | .text |
|---|
| 26 | ENTRY (__longjmp) |
|---|
| 27 | #ifdef PTR_DEMANGLE |
|---|
| 28 | movl 4(%esp), %eax /* User's jmp_buf in %eax. */ |
|---|
| 29 | |
|---|
| 30 | /* Save the return address now. */ |
|---|
| 31 | movl (JB_PC*4)(%eax), %edx |
|---|
| 32 | /* Get the stack pointer. */ |
|---|
| 33 | movl (JB_SP*4)(%eax), %ecx |
|---|
| 34 | PTR_DEMANGLE (%edx) |
|---|
| 35 | PTR_DEMANGLE (%ecx) |
|---|
| 36 | LIBC_PROBE (longjmp, 3, 4@%eax, -4@8(%esp), 4@%edx) |
|---|
| 37 | cfi_def_cfa(%eax, 0) |
|---|
| 38 | cfi_register(%eip, %edx) |
|---|
| 39 | cfi_register(%esp, %ecx) |
|---|
| 40 | cfi_offset(%ebx, JB_BX*4) |
|---|
| 41 | cfi_offset(%esi, JB_SI*4) |
|---|
| 42 | cfi_offset(%edi, JB_DI*4) |
|---|
| 43 | cfi_offset(%ebp, JB_BP*4) |
|---|
| 44 | /* Restore registers. */ |
|---|
| 45 | movl (JB_BX*4)(%eax), %ebx |
|---|
| 46 | movl (JB_SI*4)(%eax), %esi |
|---|
| 47 | movl (JB_DI*4)(%eax), %edi |
|---|
| 48 | movl (JB_BP*4)(%eax), %ebp |
|---|
| 49 | cfi_restore(%ebx) |
|---|
| 50 | cfi_restore(%esi) |
|---|
| 51 | cfi_restore(%edi) |
|---|
| 52 | cfi_restore(%ebp) |
|---|
| 53 | |
|---|
| 54 | LIBC_PROBE (longjmp_target, 3, 4@%eax, -4@8(%esp), 4@%edx) |
|---|
| 55 | movl 8(%esp), %eax /* Second argument is return value. */ |
|---|
| 56 | movl %ecx, %esp |
|---|
| 57 | #else |
|---|
| 58 | movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */ |
|---|
| 59 | movl 8(%esp), %eax /* Second argument is return value. */ |
|---|
| 60 | /* Save the return address now. */ |
|---|
| 61 | movl (JB_PC*4)(%ecx), %edx |
|---|
| 62 | LIBC_PROBE (longjmp, 3, 4@%ecx, -4@%eax, 4@%edx) |
|---|
| 63 | /* Restore registers. */ |
|---|
| 64 | movl (JB_BX*4)(%ecx), %ebx |
|---|
| 65 | movl (JB_SI*4)(%ecx), %esi |
|---|
| 66 | movl (JB_DI*4)(%ecx), %edi |
|---|
| 67 | movl (JB_BP*4)(%ecx), %ebp |
|---|
| 68 | movl (JB_SP*4)(%ecx), %esp |
|---|
| 69 | LIBC_PROBE (longjmp_target, 3, 4@%ecx, -4@%ecx, 4@%edx) |
|---|
| 70 | #endif |
|---|
| 71 | /* Jump to saved PC. */ |
|---|
| 72 | jmp *%edx |
|---|
| 73 | END (__longjmp) |
|---|
| 74 | |
|---|
