syscall.S revision 7efad83d430f4d824f2aaa75edea5106f6ff8aae 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <private/bionic_asm.h>
30
31/*
32 * The caller is only required to allocate 16 bytes of stack for a0-a3.
33 * syscall has up to 6 arguments, so we need space for the extra two arguments.
34 */
35#define STACKSIZE 2*4
36
37ENTRY(syscall)
38    .set noreorder
39    .cpload t9
40    move    v0, a0
41    move    a0, a1
42    move    a1, a2
43    move    a2, a3
44    lw      a3, 16(sp)
45    lw      t0, 20(sp)
46    lw      t1, 24(sp)
47    subu    sp, STACKSIZE
48    sw      t0, 16(sp)
49    sw      t1, 20(sp)
50    syscall
51    addu    sp, STACKSIZE
52    bnez    a3, 1f
53    move    a0, v0
54    j       ra
55    nop
561:
57    la      t9,__set_errno_internal
58    j       t9
59    nop
60    .set reorder
61END(syscall)
62