minix/lib/libc/arch/arm/sys/brk.S
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

95 lines
2.6 KiB
ArmAsm

/* $NetBSD: brk.S,v 1.13 2013/09/12 15:36:15 joerg 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 "SYS.h"
.globl _C_LABEL(_end)
.globl _C_LABEL(__curbrk)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
.data
.align 0
.globl _C_LABEL(__minbrk)
.hidden _C_LABEL(__minbrk)
.type _C_LABEL(__minbrk),#object
_C_LABEL(__minbrk):
.word _C_LABEL(_end)
/*
* Change the data segment size
*/
ENTRY(_brk)
ldr r1, .Lminbrk
#ifdef __PIC__
adr r3, .Lminbrk
adds r1, r1, r3
#endif
/* 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
#ifdef __thumb__
bcs 1f
mov r0, r1
1:
#else
movcc r0, r1
#endif
mov r2, r0
SYSTRAP(break)
_INVOKE_CERROR()
ldr r1, .Lcurbrk
#ifdef __PIC__
adds r1, r1, r3
#endif
/* Store the new address in curbrk */
str r2, [r1]
/* Return 0 for success */
movs r0, #0
RET
.align 0
.Lminbrk:
.word REL_SYM(_C_LABEL(__minbrk), .Lminbrk)
.Lcurbrk:
.word REL_SYM(_C_LABEL(__curbrk), .Lminbrk)
END(_brk)