From 6811c064139574e2e2e07fdeb10218428cd68b36 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Thu, 6 Jul 2000 06:37:55 +0000 Subject: Hacked things so longjmp now works. -Erik --- libc/sysdeps/linux/i386/setjmp.S | 145 ++++++++++++++++----------------------- 1 file changed, 58 insertions(+), 87 deletions(-) (limited to 'libc/sysdeps/linux/i386/setjmp.S') diff --git a/libc/sysdeps/linux/i386/setjmp.S b/libc/sysdeps/linux/i386/setjmp.S index 3ff05425f..d6f2cba8b 100644 --- a/libc/sysdeps/linux/i386/setjmp.S +++ b/libc/sysdeps/linux/i386/setjmp.S @@ -1,88 +1,59 @@ -/* These are predefined by new versions of GNU cpp. */ - -#ifndef __USER_LABEL_PREFIX__ -#define __USER_LABEL_PREFIX__ _ -#endif - -#ifndef __REGISTER_PREFIX__ -#define __REGISTER_PREFIX__ -#endif - -/* ANSI concatenation macros. */ - -#define CONCAT1(a, b) CONCAT2(a, b) -#define CONCAT2(a, b) a ## b - -/* Use the right prefix for global labels. */ - -#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) - -/* Use the right prefix for registers. */ - -#define REG(x) CONCAT1 (__REGISTER_PREFIX__, x) - -#define d0 REG (d0) -#define d1 REG (d1) -#define d2 REG (d2) -#define d3 REG (d3) -#define d4 REG (d4) -#define d5 REG (d5) -#define d6 REG (d6) -#define d7 REG (d7) -#define a0 REG (a0) -#define a1 REG (a1) -#define a2 REG (a2) -#define a3 REG (a3) -#define a4 REG (a4) -#define a5 REG (a5) -#define a6 REG (a6) -#define fp REG (fp) -#define sp REG (sp) - -.global SYM (setjmp) -.global SYM (longjmp) - -SYM (setjmp): - moveal sp@(4),a0 - movel sp@(0),a0@(12) - movel sp,a0@(8) - moveml d2-d7/a2-a6,a0@(20) - clrl d0 - rts - -SYM (longjmp): - moveal sp@(4),a0 - movel sp@(8),d0 - bne 1f - movel #1,d0 -1: - moveml a0@(20),d2-d7/a2-a6 - moveal a0@(8),sp - movel a0@(12),sp@ - rts - -#ifdef M68881 -.global SYM (setjmp_68881) -.global SYM (longjmp_68881) - -SYM (setjmp_68881): - moveal sp@(4),a0 - movel sp@(0),a0@(12) - movel sp,a0@(8) - moveml d2-d7/a2-a6,a0@(20) - fmovemx fp2-fp7,a0@(64) - clrl d0 - rts - -SYM (longjmp_68881): - moveal sp@(4),a0 - fmovemx a0@(64),fp2-fp7 - movel sp@(8),d0 - bne 1f - movel #1,d0 -1: - moveml a0@(20),d2-d7/a2-a6 - moveal a0@(8),sp - movel a0@(12),sp@ - rts +/* setjmp for i386. + Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include +#define _ASM +#define _SETJMP_H +#include + +ENTRY (__setjmp) + popl %eax /* Pop return address. */ + popl %ecx /* Pop jmp_buf. */ + pushl $0 /* Push zero argument. */ + pushl %ecx /* Push jmp_buf. */ + pushl %eax /* Push back return address. */ + +ENTRY (__sigsetjmp) + movl 4(%esp), %eax /* User's jmp_buf in %eax. */ + /* Save registers. */ + movl %ebx, (JB_BX*4)(%eax) + movl %esi, (JB_SI*4)(%eax) + movl %edi, (JB_DI*4)(%eax) + movl %ebp, (JB_BP*4)(%eax) + leal 4(%esp), %ecx /* Save SP as it will be after we return. */ + movl %ecx, (JB_SP*4)(%eax) + movl 0(%esp), %ecx /* Save PC we are returning to now. */ + movl %ecx, (JB_PC*4)(%eax) + + /* Make a tail call to __sigjmp_save; it takes the same args. */ +#ifdef PIC + /* We cannot use the PLT, because it requires that %ebx be set, but + we can't save and restore our caller's value. Instead, we do an + indirect jump through the GOT, using for the temporary register + %ecx, which is call-clobbered. */ + call L(here) +L(here): + popl %ecx + addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx + movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx + jmp *%ecx +#else + jmp __sigjmp_save #endif +.size __sigsetjmp,.-__sigsetjmp; -- cgit v1.2.3