| Chris Dearman | effaa78 | 2013-11-13 14:15:31 -0800 | [diff] [blame] | 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 <asm/unistd.h> |
| 30 | .text |
| 31 | .globl syscall |
| 32 | .align 4 |
| 33 | .ent syscall |
| 34 | |
| Chris Dearman | 766c7ef | 2013-12-16 14:10:13 -0800 | [diff] [blame] | 35 | /* |
| 36 | * The caller is only required to allocate 16 bytes of stack for a0-a3. |
| 37 | * syscall has up to 6 arguments, so we need space for the extra two arguments. |
| 38 | */ |
| 39 | #define STACKSIZE 2*4 |
| 40 | |
| Chris Dearman | effaa78 | 2013-11-13 14:15:31 -0800 | [diff] [blame] | 41 | syscall: |
| 42 | .set noreorder |
| 43 | .cpload $t9 |
| 44 | move $v0, $a0 |
| 45 | move $a0, $a1 |
| 46 | move $a1, $a2 |
| 47 | move $a2, $a3 |
| 48 | lw $a3, 16($sp) |
| 49 | lw $t0, 20($sp) |
| 50 | lw $t1, 24($sp) |
| Chris Dearman | 766c7ef | 2013-12-16 14:10:13 -0800 | [diff] [blame] | 51 | subu $sp, STACKSIZE |
| Chris Dearman | effaa78 | 2013-11-13 14:15:31 -0800 | [diff] [blame] | 52 | sw $t0, 16($sp) |
| 53 | sw $t1, 20($sp) |
| 54 | syscall |
| Chris Dearman | 766c7ef | 2013-12-16 14:10:13 -0800 | [diff] [blame] | 55 | addu $sp, STACKSIZE |
| Chris Dearman | effaa78 | 2013-11-13 14:15:31 -0800 | [diff] [blame] | 56 | bnez $a3, 1f |
| 57 | move $a0, $v0 |
| 58 | j $ra |
| 59 | nop |
| 60 | 1: |
| 61 | la $t9,__set_errno |
| 62 | j $t9 |
| 63 | nop |
| 64 | .set reorder |
| 65 | .end syscall |