1/* $NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 simonb Exp $ */
2
3/*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.

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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD: head/lib/libc/mips/sys/sbrk.S 209231 2010-06-16 12:55:14Z jchandra $");
37#include "SYS.h"
38
39#if defined(LIBC_SCCS) && !defined(lint)
40 ASMSTR("from: @(#)sbrk.s 8.1 (Berkeley) 6/4/93")
41 ASMSTR("$NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 simonb Exp $")
42#endif /* LIBC_SCCS and not lint */
43
44 .globl _C_LABEL(__curbrk)
45 .globl _C_LABEL(_end)
46
47 .data
48_C_LABEL(__curbrk):
49 .word _C_LABEL(_end)
50 .text
51
52LEAF(__sys_sbrk)
53 WEAK_ALIAS(sbrk, __sys_sbrk)
54 WEAK_ALIAS(_sbrk, __sys_sbrk)
55 PIC_PROLOGUE(__sys_sbrk)
56 PTR_LA t0, _C_LABEL(__curbrk)
57 PTR_L t0, 0(t0)
58 PTR_ADDU a0, a0, t0
59
60 li v0, SYS_break
61 syscall
62
63 bne a3, zero, 1f
64 nop
65 move v0, t0 # return old val of curbrk from above
66 PTR_LA t0, _C_LABEL(__curbrk)
67 PTR_S a0, 0(t0) # save current val of curbrk from above
68 PIC_RETURN()
69 j ra
70
711:
72 PIC_TAILCALL(__cerror)
73END(__sys_sbrk)