mips/sys/brk.S

1.17      matt /*	$NetBSD: brk.S,v 1.17 2009/12/14 01:07:42 matt Exp $	*/
 1.6  jonathan
 1.1     glass /*-
 1.1     glass  * Copyright (c) 1991, 1993
 1.1     glass  *	The Regents of the University of California.  All rights reserved.
 1.1     glass  *
 1.1     glass  * This code is derived from software contributed to Berkeley by
 1.1     glass  * Ralph Campbell.
 1.1     glass  *
 1.1     glass  * Redistribution and use in source and binary forms, with or without
 1.1     glass  * modification, are permitted provided that the following conditions
 1.1     glass  * are met:
 1.1     glass  * 1. Redistributions of source code must retain the above copyright
 1.1     glass  *    notice, this list of conditions and the following disclaimer.
 1.1     glass  * 2. Redistributions in binary form must reproduce the above copyright
 1.1     glass  *    notice, this list of conditions and the following disclaimer in the
 1.1     glass  *    documentation and/or other materials provided with the distribution.
1.16       agc  * 3. Neither the name of the University nor the names of its contributors
 1.1     glass  *    may be used to endorse or promote products derived from this software
 1.1     glass  *    without specific prior written permission.
 1.1     glass  *
 1.1     glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 1.1     glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 1.1     glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 1.1     glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 1.1     glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 1.1     glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 1.1     glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 1.1     glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 1.1     glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 1.1     glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 1.1     glass  * SUCH DAMAGE.
 1.1     glass  */
 1.1     glass
 1.5  jonathan #include "SYS.h"
 1.5  jonathan
 1.1     glass #if defined(LIBC_SCCS) && !defined(lint)
1.17      matt #if 0
1.17      matt 	RCSID("from: @(#)brk.s	8.1 (Berkeley) 6/4/93")
1.17      matt #else
1.17      matt 	RCSID("$NetBSD: brk.S,v 1.17 2009/12/14 01:07:42 matt Exp $")
1.17      matt #endif
 1.1     glass #endif /* LIBC_SCCS and not lint */
 1.7  jonathan
 1.8    kleink 	.globl	_C_LABEL(__minbrk)
 1.8    kleink 	.globl	_C_LABEL(__curbrk)
 1.9    kleink 	.globl	_C_LABEL(_end)
 1.4   mycroft
1.10    kleink #ifdef WEAK_ALIAS
1.10    kleink WEAK_ALIAS(brk, _brk)
1.10    kleink #endif
1.10    kleink
 1.4   mycroft 	.data
 1.8    kleink _C_LABEL(__minbrk):
1.17      matt 	PTR_WORD	_C_LABEL(_end)
 1.4   mycroft 	.text
 1.1     glass
1.10    kleink LEAF(_brk)
1.17      matt 	PIC_PROLOGUE(_brk)
1.17      matt 	PTR_LA		t0, _C_LABEL(__minbrk)
1.17      matt 	PTR_L		v0, 0(t0)
1.17      matt 	bgeu		a0, v0, 1f
1.17      matt 	move		a0, v0		# dont allow break < minbrk
1.12    kleink 1:
1.17      matt 	li		v0, SYS_break
 1.1     glass 	syscall
1.17      matt 	bne		a3, zero, 2f
1.17      matt 	PTR_S		a0, 0(t0)
1.17      matt 	move		v0, zero
1.17      matt 	PIC_RETURN()
1.12    kleink 2:
1.17      matt 	PIC_TAILCALL(__cerror)
1.15    simonb END(_brk)