diff options
Diffstat (limited to 'lib/libc/mips/sys/sbrk.S')
| -rw-r--r-- | lib/libc/mips/sys/sbrk.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/libc/mips/sys/sbrk.S b/lib/libc/mips/sys/sbrk.S new file mode 100644 index 0000000..c535360 --- /dev/null +++ b/lib/libc/mips/sys/sbrk.S @@ -0,0 +1,85 @@ +/* $NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 simonb Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Ralph Campbell. + * + * 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. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); +#include "SYS.h" + +#if defined(LIBC_SCCS) && !defined(lint) + ASMSTR("from: @(#)sbrk.s 8.1 (Berkeley) 6/4/93") + ASMSTR("$NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 simonb Exp $") +#endif /* LIBC_SCCS and not lint */ + + .globl _C_LABEL(__curbrk) + .globl _C_LABEL(_end) + + .data +_C_LABEL(__curbrk): + .word _C_LABEL(_end) + .text + +LEAF(__sys_sbrk) + WEAK_ALIAS(sbrk, __sys_sbrk) + WEAK_ALIAS(_sbrk, __sys_sbrk) +#ifdef __ABICALLS__ + .set noreorder + .cpload t9 + .set reorder +#endif + addu sp, sp, -16 + sw s0, 0(sp) # Preserve s0 value in stack + # it should be the same on return + # We can't use v1 as temporary + # register since syscall uses it + # to return 64-bit values + lw s0, _C_LABEL(__curbrk) + li v0, SYS_break + addu a0, a0, s0 # compute current break + + syscall + + bne a3, zero, 1f + nop + move v0, s0 # return old val of curbrk from above + lw s0, 0(sp) + addu sp, sp, 16 + sw a0, _C_LABEL(__curbrk) # save current val of curbrk from above + j ra + +1: + lw s0, 0(sp) + addu sp, sp, 16 + la t9, _C_LABEL(__cerror) + jr t9 +END(__sys_sbrk) |
