minix/lib/nbsd_libc/arch/powerpc/sys/brk.S

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/* $NetBSD: brk.S,v 1.12 2011/01/16 02:43:10 matt Exp $ */
#include "SYS.h"
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: brk.S,v 1.12 2011/01/16 02:43:10 matt Exp $")
#endif /* LIBC_SCCS && !lint */
.globl _C_LABEL(__curbrk)
.globl _C_LABEL(__minbrk)
.globl _C_LABEL(_end)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
.data
_C_LABEL(__minbrk):
.long _C_LABEL(_end) # XXX not used yet
.text
ENTRY(_brk)
#if defined(PIC)
mflr %r10
PIC_GOTSETUP(%r9)
mtlr %r10
lwz %r5,_C_LABEL(_end)@got(%r9)
#else
lis %r5,_C_LABEL(_end)@ha # r5 = &_end
addi %r5,%r5,_C_LABEL(_end)@l
#endif
cmplw %r5,%r3 # if (&_end <= r3)
bgt 0f
mr %r5,%r3 # r5 = r3
0:
mr %r3,%r5 # new break value
_DOSYSCALL(break) # assume, that r5 is kept
bso 1f
#ifdef PIC
lwz %r6,_C_LABEL(__curbrk)@got(%r9)
stw %r5,0(%r6)
#else
lis %r6,_C_LABEL(__curbrk)@ha # record new break
stw %r5,_C_LABEL(__curbrk)@l(%r6)
#endif
blr # return 0
1:
b _C_LABEL(__cerror)
END(_brk)