projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| e3726b05 | 1 | /* setjmp for i386. |
| e3845371 | 2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. |
| e3726b05 RM |
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 Library General Public License as | |
| 7 | published by the Free Software Foundation; either version 2 of the | |
| 8 | 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 | Library General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Library General Public | |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If | |
| 17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
| 18 | Cambridge, MA 02139, USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #define _ASM | |
| 22 | #include <jmp_buf.h> | |
| 23 | ||
| e3845371 RM |
24 | /* Binary compatibility entry point. */ |
| 25 | ENTRY (__setjmp) | |
| 26 | popl %eax /* Pop return address. */ | |
| 27 | pushl $0 /* Push zero argument. */ | |
| 28 | pushl %eax /* Push back return address. */ | |
| 29 | ||
| e3726b05 RM |
30 | ENTRY (__sigsetjmp) |
| 31 | movl 4(%esp), %eax /* User's jmp_buf in %eax. */ | |
| 32 | /* Save registers. */ | |
| 44c8d1a2 RM |
33 | movl %ebx, (JB_BX*4)(%eax) |
| 34 | movl %esi, (JB_SI*4)(%eax) | |
| 35 | movl %edi, (JB_DI*4)(%eax) | |
| 36 | movl %ebp, (JB_BP*4)(%eax) | |
| e3726b05 | 37 | leal 4(%esp), %ecx /* Save SP as it will be after we return. */ |
| 44c8d1a2 | 38 | movl %ecx, (JB_SP*4)(%eax) |
| e3726b05 | 39 | movl 0(%esp), %ecx /* Save PC we are returning to now. */ |
| 44c8d1a2 RM |
40 | movl %ecx, (JB_PC*4)(%eax) |
| 41 | ||
| 42 | /* Make a tail call to __sigjmp_save; it takes the same args. */ | |
| 43 | #ifdef PIC | |
| 44 | /* We cannot use the PLT, because it requires that %ebx be set, but | |
| 45 | we can't save and restore our caller's value. Instead, we do an | |
| 46 | indirect jump through the GOT, using for the temporary register | |
| 47 | %ecx, which is call-clobbered. */ | |
| 48 | call here | |
| 49 | here: popl %ecx | |
| 50 | addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx | |
| 51 | movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx | |
| 52 | jmp *%ecx | |
| 53 | #else | |
| 54 | jmp __sigjmp_save | |
| 55 | #endif | |
| cccda09f | 56 | PSEUDO_END (__sigsetjmp) |