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. --- 19 unchanged lines hidden (view full) --- 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) |