Changeset View
Changeset View
Standalone View
Standalone View
lib/libc/aarch64/sys/sbrk.S
- This file was added.
Property | Old Value | New Value |
---|---|---|
svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* Copyright (c) 2014 The FreeBSD Foundation | |||||
* All rights reserved. | |||||
* | |||||
* This software was developed by Andrew Turner under | |||||
* sponsorship from the FreeBSD Foundation. | |||||
* | |||||
* 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. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. | |||||
*/ | |||||
#include <machine/asm.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include "SYS.h" | |||||
.data | |||||
.align 3 | |||||
.global _C_LABEL(curbrk) | |||||
.type _C_LABEL(curbrk),#object | |||||
_C_LABEL(curbrk): | |||||
.quad _C_LABEL(_end) | |||||
.text | |||||
/* | |||||
* void *sbrk(intptr_t incr); | |||||
*/ | |||||
ENTRY(_sbrk) | |||||
WEAK_REFERENCE(_sbrk, sbrk) | |||||
/* Load the address of curbrk */ | |||||
#ifdef __PIC__ | |||||
adrp x2, :got:curbrk | |||||
ldr x3, [x2, #:got_lo12:curbrk] | |||||
#else | |||||
ldr x3, .Lcurbrk | |||||
#endif | |||||
/* Get the current brk address */ | |||||
ldr x2, [x3] | |||||
/* Calculate the new value */ | |||||
add x0, x2, x0 | |||||
mov x4, x0 | |||||
/* Update for this value, will overwrite x0 and x1 */ | |||||
_SYSCALL(break) | |||||
b.cs cerror | |||||
/* Load the old value to return */ | |||||
ldr x0, [x3] | |||||
/* Store the new curbrk value */ | |||||
str x4, [x3] | |||||
ret | |||||
#ifndef __PIC__ | |||||
.Lcurbrk: | |||||
.quad _C_LABEL(curbrk) | |||||
#endif | |||||
END(_sbrk) |