glibc/sysdeps/unix/i386/brk.S
Roland McGrath e3726b056b Rewrote i386 setjmp in assembly.
Thu Aug 31 13:23:35 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

	* 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.
1995-08-31 17:33:01 +00:00

51 lines
1.4 KiB
ArmAsm

/* Copyright (C) 1991, 1992, 1993, 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 <sysdep.h>
#ifndef SYS_brk
#define SYS_brk 17
#endif
.data
.globl C_SYMBOL_NAME(__curbrk)
C_LABEL(__curbrk)
#ifdef HAVE_GNU_LD
.long C_SYMBOL_NAME(_end)
#else
.long C_SYMBOL_NAME(end)
#endif
.text
SYSCALL__ (brk, 1)
movl 4(%esp), %eax
#ifdef PIC
/* Standard PIC nonsense to store into `__curbrk' through the GOT. */
call here
here: popl %ecx
addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
movl C_SYMBOL_NAME(__curbrk@GOT)(%ecx), %ecx
movl %eax, (%ecx)
#else
movl %eax, C_SYMBOL_NAME(__curbrk)
#endif
xorl %eax, %eax
ret
weak_alias (__brk, brk)