| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version. |
| 2 | Copyright (C) 1994-2016 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 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* This just does a tail-call to `__sigsetjmp (ARG, 1)'. |
| 20 | We cannot do it in C because it must be a tail-call, so frame-unwinding |
| 21 | in setjmp doesn't clobber the state restored by longjmp. */ |
| 22 | |
| 23 | #include <sysdep.h> |
| 24 | #include <jmpbuf-offsets.h> |
| 25 | #include <stap-probe.h> |
| 26 | |
| 27 | #define PARMS 4 /* no space for saved regs */ |
| 28 | #define JMPBUF PARMS |
| 29 | #define SIGMSK JMPBUF+4 |
| 30 | |
| 31 | ENTRY (setjmp) |
| 32 | /* Note that we have to use a non-exported symbol in the next |
| 33 | jump since otherwise gas will emit it as a jump through the |
| 34 | PLT which is what we cannot use here. */ |
| 35 | |
| 36 | movl JMPBUF(%esp), %eax |
| 37 | |
| 38 | /* Save registers. */ |
| 39 | movl %ebx, (JB_BX*4)(%eax) |
| 40 | movl %esi, (JB_SI*4)(%eax) |
| 41 | movl %edi, (JB_DI*4)(%eax) |
| 42 | leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ |
| 43 | #ifdef PTR_MANGLE |
| 44 | PTR_MANGLE (%ecx) |
| 45 | #endif |
| 46 | movl %ecx, (JB_SP*4)(%eax) |
| 47 | movl 0(%esp), %ecx /* Save PC we are returning to now. */ |
| 48 | LIBC_PROBE (setjmp, 3, 4@%eax, -4@$1, 4@%ecx) |
| 49 | #ifdef PTR_MANGLE |
| 50 | PTR_MANGLE (%ecx) |
| 51 | #endif |
| 52 | movl %ecx, (JB_PC*4)(%eax) |
| 53 | movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */ |
| 54 | |
| 55 | /* Call __sigjmp_save. */ |
| 56 | pushl $1 |
| 57 | cfi_adjust_cfa_offset (4) |
| 58 | pushl 8(%esp) |
| 59 | cfi_adjust_cfa_offset (4) |
| 60 | call __sigjmp_save |
| 61 | popl %ecx |
| 62 | cfi_adjust_cfa_offset (-4) |
| 63 | popl %edx |
| 64 | cfi_adjust_cfa_offset (-4) |
| 65 | ret |
| 66 | END (setjmp) |