__brk.s

一个C源代码分析器

/* Copyright (C) 1993 Free Software Foundation, Inc.
   Contributed by Brendan Kehoe ([e-mail]).

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

#ifndef       HAVE_GNU_LD
#define __end           end
#endif

.data
	.extern __end,8
	.globl __curbrk
__curbrk:
	.quad __end

.text
ENTRY(__brk)
	! FIXME We do not check for asking for less than a page yet.
	ldiq v0, SYS_brk
	call_pal PAL_callsys
	bne a3, error

	/* Update __curbrk and exit cleanly.  */
!	ldgp gp, 0(t12)
	stl a0, __curbrk

	mov zero, v0
	ret
	/* What a horrible way to die.  */
error:	ldgp gp,0(gp)
	jmp zero,syscall_error
	.end __brk