minix/lib/libc/arch/powerpc64/sys/brk.S

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/* $NetBSD: brk.S,v 1.4 2011/10/29 16:03:33 christos Exp $ */
#include "SYS.h"
.globl _C_LABEL(__curbrk)
.globl _C_LABEL(__minbrk)
.globl _C_LABEL(_end)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
.macro LdAddr r,sym
.pushsection ".toc","aw"
100: .tc \sym[TC],\sym
.popsection
ld \r,100b@toc(2)
.endm
.data
_C_LABEL(__minbrk):
.long _C_LABEL(_end)
.text
ENTRY(_brk)
LdAddr %r5,_end
cmpld %r5,%r3 # if (&_end <= r3)
bgt 0f
mr %r5,%r3 # r5 = r3
0:
mr %r3,%r5 # new break value
li %r0,SYS_break
sc # assume, that r5 is kept
bso 1f
LdAddr %r6,__curbrk
std %r5,0(%r6)
blr # return 0
1:
b PIC_PLT(_C_LABEL(__cerror))