minix/lib/nbsd_libc/arch/x86_64/sys/sbrk.S

87 lines
2.5 KiB
ArmAsm
Raw Normal View History

/* $NetBSD: sbrk.S,v 1.3 2008/07/02 20:07:43 rmind Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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: @(#)sbrk.s 5.1 (Berkeley) 4/23/90
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: sbrk.S,v 1.3 2008/07/02 20:07:43 rmind Exp $")
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
.globl _end
.globl CURBRK
#ifdef WEAK_ALIAS
WEAK_ALIAS(sbrk, _sbrk)
#endif
.data
CURBRK: .quad _end
.text
ENTRY(_sbrk)
#ifdef PIC
movq PIC_GOT(CURBRK),%rdx
movq (%rdx),%rax
test %rdi,%rdi
jz out
addq %rax,%rdi
SYSTRAP(break)
jc err
movq PIC_GOT(CURBRK),%rdx
movq (%rdx),%rax
movq %rdi,(%rdx)
out:
ret
err:
mov PIC_GOT(CERROR),%rdx
jmp *%rdx
#else
movq CURBRK(%rip),%rax
test %rdi,%rdi
jz out
movq %rdi,%rsi
addq %rax,%rdi
SYSTRAP(break)
jc err
movq CURBRK(%rip),%rax
addq %rsi,CURBRK(%rip)
out:
ret
err:
jmp CERROR
#endif