blob: 6b84ba4f3b4f517a6fd41c157c2edf6f5a5f7ac2 [file] [log] [blame]
Elliott Hughes4906e562013-10-04 14:55:30 -07001/*
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/*
30 * Generic syscall call.
31 * Upon entry:
32 * %rax: system call number
33 * %rdi: arg0 to system call
34 * %rsi: arg1
35 * %rdx: arg2
36 * %rcx: arg3 - syscall expects it at %r10
37 * %r8: arg4
38 * %r9: arg5
39 */
40
41#include <asm/unistd.h>
42#include <linux/err.h>
43#include <machine/asm.h>
44
45ENTRY(syscall)
46 # All arguments are passed via registers.
47 # (Not all will be valid, depending on the syscall.)
48 mov %edi, %eax
49 mov %rsi, %rdi
50 mov %rdx, %rsi
51 mov %rcx, %rdx
52 mov %r8, %r10
53 mov %r9, %r8
54 mov 8(%rsp), %r9
55
56 # Make the system call.
57 syscall
58 cmpq $-MAX_ERRNO, %rax
59 jb 1f
60 negl %eax
61 movl %eax, %edi
62 call __set_errno
63 orq $-1, %rax
641:
65 ret