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/*
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 <private/bionic_asm.h>
42
43ENTRY(syscall)
44    # All arguments are passed via registers.
45    # (Not all will be valid, depending on the syscall.)
46    mov     %edi, %eax
47    mov     %rsi, %rdi
48    mov     %rdx, %rsi
49    mov     %rcx, %rdx
50    mov     %r8,  %r10
51    mov     %r9,  %r8
52    mov     8(%rsp), %r9
53
54    # Make the system call.
55    syscall
56    cmpq    $-MAX_ERRNO, %rax
57    jb      1f
58    negl    %eax
59    movl    %eax, %edi
60    call    __set_errno_internal
611:
62    ret
63END(syscall)
64