diff options
Diffstat (limited to 'lib/libc/arm/sys/sbrk.S')
| -rw-r--r-- | lib/libc/arm/sys/sbrk.S | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/lib/libc/arm/sys/sbrk.S b/lib/libc/arm/sys/sbrk.S new file mode 100644 index 0000000..20821fe --- /dev/null +++ b/lib/libc/arm/sys/sbrk.S @@ -0,0 +1,88 @@ +/* $NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc 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: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); +#include "SYS.h" + + .globl _C_LABEL(end) + +#ifdef WEAK_ALIAS +WEAK_ALIAS(sbrk, _sbrk) +#endif + + .data + .align 0 + .globl CURBRK + .type CURBRK,#object +CURBRK: + .word _C_LABEL(end) + +/* + * Change the data segment size + */ +ENTRY(_sbrk) +#ifdef PIC + /* Setup the GOT */ + ldr r3, .Lgot + add r3, pc, r3 +.L1: + ldr r2, .Lcurbrk + ldr r2, [r3, r2] +#else + ldr r2, .Lcurbrk +#endif + /* Get the current brk address */ + ldr r1, [r2] + + /* Calculate new value */ + mov r3, r0 + add r0, r0, r1 + SYSTRAP(break) + bcs PIC_SYM(CERROR, PLT) + + /* Store new curbrk value */ + ldr r0, [r2] + add r1, r0, r3 + str r1, [r2] + + /* Return old curbrk value */ + RET + + .align 0 +#ifdef PIC +.Lgot: + .word _GLOBAL_OFFSET_TABLE_ - (.L1+4) +#endif +.Lcurbrk: + .word PIC_SYM(CURBRK, GOT) |
