From e3726b056b3b1cfde7019e29d5d3c50ce70e08e9 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Thu, 31 Aug 1995 17:33:01 +0000 Subject: Rewrote i386 setjmp in assembly. Thu Aug 31 13:23:35 1995 Roland McGrath * sysdeps/unix/i386/brk.S [PIC]: Set __curbrk through the GOT. Rewrote i386 setjmp code in assembly, so as to avoid fighting with the compiler for the register values. * sysdeps/i386/setjmp.S, sysdeps/i386/__longjmp.S: New files. * sysdeps/i386/setjmp.c, sysdeps/i386/__longjmp.c: Files removed. * sysdeps/i386/jmp_buf.h [! _ASM] (__jmp_buf): Define as array of ints. [__USE_MISC || _ASM] (JB_*): New macros, for indices therein. (_JMPBUF_UNWINDS): Use JB_SP. --- sysdeps/i386/__longjmp.S | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 sysdeps/i386/__longjmp.S (limited to 'sysdeps/i386/__longjmp.S') diff --git a/sysdeps/i386/__longjmp.S b/sysdeps/i386/__longjmp.S new file mode 100644 index 0000000..f546622 --- /dev/null +++ b/sysdeps/i386/__longjmp.S @@ -0,0 +1,35 @@ +/* longjmp for i386. +Copyright (C) 1995 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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#define _ASM +#include + +ENTRY (__longjmp) + movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */ + movl 8(%esp), %eax /* Second argument is return value. */ + /* Restore registers. */ + movl JB_BX(%ecx), %ebx + movl JB_SI(%ecx), %esi + movl JB_DI(%ecx), %edi + movl JB_BP(%ecx), %ebp + movl JB_SP(%ecx), %esp + /* Jump to saved PC. */ + movl JB_PC(%ecx), %ecx + jmp *%ecx -- cgit v1.1