minix/lib/libc/arch/powerpc/sys/sbrk.S

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/* $NetBSD: sbrk.S,v 1.11 2011/01/16 02:43:10 matt Exp $ */
#include "SYS.h"
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: sbrk.S,v 1.11 2011/01/16 02:43:10 matt Exp $")
#endif /* LIBC_SCCS && !lint */
.globl _C_LABEL(__curbrk)
.globl _C_LABEL(_end)
#ifdef WEAK_ALIAS
WEAK_ALIAS(sbrk, _sbrk)
#endif
.data
_C_LABEL(__curbrk):
.long _C_LABEL(_end)
.text
ENTRY(_sbrk)
#ifdef PIC
mflr %r10
PIC_GOTSETUP(%r5)
mtlr %r10
lwz %r5,_C_LABEL(__curbrk)@got(%r5)
lwz %r6,0(%r5)
#else
lis %r5,_C_LABEL(__curbrk)@ha
lwzu %r6,_C_LABEL(__curbrk)@l(%r5) # r6 = old break, r5 = &curbrk
#endif
add %r3,%r3,%r6
mr %r7,%r3 # r7 = new break
_DOSYSCALL(break) # break(new_break)
bso 1f
mr %r3,%r6 # set return value
stw %r7,0(%r5) # record new break
blr
1:
b _C_LABEL(__cerror)
END(_sbrk)