96 lines
2.6 KiB
ArmAsm
96 lines
2.6 KiB
ArmAsm
/* $NetBSD: brk.S,v 1.6 2003/08/07 16:42:04 agc Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)brk.s 5.2 (Berkeley) 12/17/90
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
__FBSDID("$FreeBSD$");
|
|
#include "SYS.h"
|
|
|
|
.globl _C_LABEL(_end)
|
|
.globl CURBRK
|
|
|
|
#ifdef WEAK_ALIAS
|
|
WEAK_ALIAS(brk, _brk)
|
|
#endif
|
|
|
|
.data
|
|
.align 0
|
|
.globl _C_LABEL(minbrk)
|
|
.type _C_LABEL(minbrk),#object
|
|
_C_LABEL(minbrk):
|
|
.word _C_LABEL(_end)
|
|
|
|
/*
|
|
* Change the data segment size
|
|
*/
|
|
ENTRY(_brk)
|
|
/* Setup the GOT */
|
|
GOT_INIT(r3, .Lgot, .L1)
|
|
GOT_GET(r1, r3, .Lminbrk)
|
|
|
|
/* Get the minimum allowable brk address */
|
|
ldr r1, [r1]
|
|
|
|
/*
|
|
* Valid the address specified and set to the minimum
|
|
* if the address is below minbrk.
|
|
*/
|
|
cmp r0, r1
|
|
it lt
|
|
movlt r0, r1
|
|
mov r2, r0
|
|
SYSTRAP(break)
|
|
bcs PIC_SYM(CERROR, PLT)
|
|
|
|
#ifdef PIC
|
|
ldr r1, .Lcurbrk
|
|
ldr r1, [r3, r1]
|
|
#else
|
|
ldr r1, .Lcurbrk
|
|
#endif
|
|
/* Store the new address in curbrk */
|
|
str r2, [r1]
|
|
|
|
/* Return 0 for success */
|
|
mov r0, #0x00000000
|
|
RET
|
|
|
|
.align 2
|
|
GOT_INITSYM(.Lgot, .L1)
|
|
.Lminbrk:
|
|
.word PIC_SYM(_C_LABEL(minbrk), GOT)
|
|
.Lcurbrk:
|
|
.word PIC_SYM(CURBRK, GOT)
|
|
END(_brk)
|
|
|
|
.section .note.GNU-stack,"",%progbits
|