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