diff options
Diffstat (limited to 'lib/libc/arch/powerpc64/sys/sbrk.S')
| -rw-r--r-- | lib/libc/arch/powerpc64/sys/sbrk.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/libc/arch/powerpc64/sys/sbrk.S b/lib/libc/arch/powerpc64/sys/sbrk.S new file mode 100644 index 00000000000..a737473e3a6 --- /dev/null +++ b/lib/libc/arch/powerpc64/sys/sbrk.S @@ -0,0 +1,63 @@ +/* $OpenBSD: sbrk.S,v 1.1 2020/06/25 02:38:28 drahn Exp $ */ + +/* + * Copyright (c) 1996 Dale Rahn + * + * 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 ``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 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 "SYS.h" + + .data + .globl __curbrk + .hidden __curbrk +__curbrk: + END(__curbrk) + .type __curbrk,@object + + .weak sbrk + + .text +PSEUDO_PREFIX(,sbrk,break) + /* call break(__curbrk + size) */ + addis %r6, %r2, __curbrk@toc@ha + addi %r6, %r6, __curbrk@toc@l /* # %r6 = &__curbrk */ + + lwz %r5, 0(%r6) /* # %r5 = *%r6 (old_curbrk) */ + add %r3, %r5, %r3 /* # %r3 = new_curbrk */ + mr %r7, %r3 + + sc + + /* check for error */ + cmpwi %r0, 0 + beq+ .L_sbrk_ok + stw %r0, R13_OFFSET_ERRNO(13) + li %r3, -1 + blr + + /* update, __curbrk and return */ +.L_sbrk_ok: + stw %r7, 0(6) /* # remember, %r6=&__curbrk, %r7=new_curbrk */ + mr %r3, %r5 /* # remember, %r5=old_curbrk */ + blr +END(sbrk) |