1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/* $NetBSD: SYS.h,v 1.5 2023/05/19 06:41:41 skrll Exp $ */
/*-
* Copyright (c) 2014,2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry, and Nick Hudson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/syscall.h>
#include <machine/asm.h>
#define SYSTRAP(x) \
li t6, SYS_ ## x; \
ecall
#define JUMP_TO_CERROR() \
.option push ;\
.option norelax ;\
tail _C_LABEL(__cerror) ;\
.option pop
#define SYSTRAP_NOERROR(x) \
SYSTRAP(x) ;\
nop; nop /* size of ... */ ;\
nop; nop /* JUMP_TO_CERROR */ ;\
/*
* Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
*/
#define RSYSCALL_NOERROR(x) \
PSEUDO_NOERROR(x,x)
/*
* Do a normal syscall.
*/
#define RSYSCALL(x) \
PSEUDO(x,x)
/*
* Do a syscall that has an internal name and a weak external alias.
*/
#define WSYSCALL(weak,strong) \
WEAK_ALIAS(weak,strong) ;\
PSEUDO(strong,weak)
/*
* Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
* and syscall name are not the same.
*/
#define PSEUDO_NOERROR(x,y) \
ENTRY(x) ;\
SYSTRAP_NOERROR(y) ;\
ret /* success */ ;\
END(x)
#define PSEUDO(x,y) \
ENTRY(x) ;\
SYSTRAP(y) ;\
JUMP_TO_CERROR() /* error */ ;\
ret /* success */ ;\
END(x)
|