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1/*
2 * Copyright (c) 1999-2011 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* Copyright (c) 1992 NeXT Computer, Inc. All rights reserved.
29 *
30 * File: SYS.h
31 *
32 * Definition of the user side of the UNIX system call interface
33 * for M98K.
34 *
35 * Errors are flagged by the location of the trap return (ie., which
36 * instruction is executed upon rfi):
37 *
38 * SC PC + 4: Error (typically branch to cerror())
39 * SC PC + 8: Success
40 *
41 * HISTORY
42 * 18-Nov-92 Ben Fathi (benf@next.com)
43 * Ported to m98k.
44 *
45 * 9-Jan-92 Peter King (king@next.com)
46 * Created.
47 */
48
49#include <sys/syscall.h>
50
51#if defined(__i386__)
52
53#include <architecture/i386/asm_help.h>
54#include <mach/i386/syscall_sw.h>
55
56/*
57 * We have two entry points. int's is used for syscalls which need to preserve
58 * %ecx across the call, or return a 64-bit value in %eax:%edx. sysenter is used
59 * for the majority of syscalls which just return a value in %eax.
60 */
61
62#define UNIX_SYSCALL_SYSENTER call __sysenter_trap
63#define UNIX_SYSCALL(name, nargs) \
64 .globl tramp_cerror ;\
65LEAF(_##name, 0) ;\
66 movl $ SYS_##name, %eax ;\
67 UNIX_SYSCALL_SYSENTER ;\
68 jnb 2f ;\
69 BRANCH_EXTERN(tramp_cerror) ;\
702:
71
72#define UNIX_SYSCALL_INT(name, nargs) \
73 .globl tramp_cerror ;\
74LEAF(_##name, 0) ;\
75 movl $ SYS_##name, %eax ;\
76 UNIX_SYSCALL_TRAP ;\
77 jnb 2f ;\
78 BRANCH_EXTERN(tramp_cerror) ;\
792:
80
81#if defined(__SYSCALL_32BIT_ARG_BYTES) && ((__SYSCALL_32BIT_ARG_BYTES >= 4) && (__SYSCALL_32BIT_ARG_BYTES <= 20))
82#define UNIX_SYSCALL_NONAME(name, nargs, cerror) \
83 movl $(SYS_##name | (__SYSCALL_32BIT_ARG_BYTES << I386_SYSCALL_ARG_BYTES_SHIFT)), %eax ;\
84 UNIX_SYSCALL_SYSENTER ;\
85 jnb 2f ;\
86 BRANCH_EXTERN(tramp_##cerror) ;\
872:
88#else /* __SYSCALL_32BIT_ARG_BYTES < 4 || > 20 */
89#define UNIX_SYSCALL_NONAME(name, nargs, cerror) \
90 movl $ SYS_##name, %eax ;\
91 UNIX_SYSCALL_SYSENTER ;\
92 jnb 2f ;\
93 BRANCH_EXTERN(tramp_##cerror) ;\
942:
95#endif
96
97#define UNIX_SYSCALL_INT_NONAME(name, nargs) \
98 .globl tramp_cerror_nocancel ;\
99 movl $ SYS_##name, %eax ;\
100 UNIX_SYSCALL_TRAP ;\
101 jnb 2f ;\
102 BRANCH_EXTERN(tramp_cerror_nocancel) ;\
1032:
104
105#define PSEUDO(pseudo, name, nargs, cerror) \
106LEAF(pseudo, 0) ;\
107 UNIX_SYSCALL_NONAME(name, nargs, cerror)
108
109#define PSEUDO_INT(pseudo, name, nargs) \
110LEAF(pseudo, 0) ;\
111 UNIX_SYSCALL_INT_NONAME(name, nargs)
112
113#define __SYSCALL2(pseudo, name, nargs, cerror) \
114 PSEUDO(pseudo, name, nargs, cerror) ;\
115 ret
116
117#define __SYSCALL(pseudo, name, nargs) \
118 PSEUDO(pseudo, name, nargs, cerror) ;\
119 ret
120
121#define __SYSCALL_INT(pseudo, name, nargs) \
122 PSEUDO_INT(pseudo, name, nargs) ;\
123 ret
124
125#elif defined(__x86_64__)
126
127#include <architecture/i386/asm_help.h>
128#include <mach/i386/syscall_sw.h>
129
130#define UNIX_SYSCALL_SYSCALL \
131 movq %rcx, %r10 ;\
132 syscall
133
134#define UNIX_SYSCALL(name, nargs) \
135 .globl cerror ;\
136LEAF(_##name, 0) ;\
137 movl $ SYSCALL_CONSTRUCT_UNIX(SYS_##name), %eax ;\
138 UNIX_SYSCALL_SYSCALL ;\
139 jnb 2f ;\
140 movq %rax, %rdi ;\
141 BRANCH_EXTERN(_cerror) ;\
1422:
143
144#define UNIX_SYSCALL_NONAME(name, nargs, cerror) \
145 .globl cerror ;\
146 movl $ SYSCALL_CONSTRUCT_UNIX(SYS_##name), %eax ;\
147 UNIX_SYSCALL_SYSCALL ;\
148 jnb 2f ;\
149 movq %rax, %rdi ;\
150 BRANCH_EXTERN(_##cerror) ;\
1512:
152
153#define PSEUDO(pseudo, name, nargs, cerror) \
154LEAF(pseudo, 0) ;\
155 UNIX_SYSCALL_NONAME(name, nargs, cerror)
156
157#define __SYSCALL2(pseudo, name, nargs, cerror) \
158 PSEUDO(pseudo, name, nargs, cerror) ;\
159 ret
160
161#define __SYSCALL(pseudo, name, nargs) \
162 PSEUDO(pseudo, name, nargs, cerror) ;\
163 ret
164
165#else
166#error Unsupported architecture
167#endif
168