libsyscall/custom/SYS.h

   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 /* Binary compatibility stubs for syscalls that no longer exist */
  52
  53 #ifndef SYS_setquota
  54 #define SYS_setquota    148
  55 #endif
  56 #ifndef SYS_quota
  57 #define SYS_quota       149
  58 #endif
  59
  60 #if defined(__i386__)
  61
  62 #include <architecture/i386/asm_help.h>
  63 #include <mach/i386/syscall_sw.h>
  64
  65 /*
  66  * We have two entry points. int's is used for syscalls which need to preserve
  67  * %ecx across the call, or return a 64-bit value in %eax:%edx. sysenter is used
  68  * for the majority of syscalls which just return a value in %eax.
  69  */
  70
  71 #define UNIX_SYSCALL_SYSENTER           call __sysenter_trap
  72 #define UNIX_SYSCALL(name, nargs)                       \
  73         .globl  cerror                                  ;\
  74 LEAF(_##name, 0)                                        ;\
  75         movl    $ SYS_##name, %eax                      ;\
  76         UNIX_SYSCALL_SYSENTER                           ;\
  77         jnb     2f                                      ;\
  78         BRANCH_EXTERN(cerror)                           ;\
  79 2:
  80
  81 #define UNIX_SYSCALL_INT(name, nargs)                   \
  82         .globl  cerror                                  ;\
  83 LEAF(_##name, 0)                                        ;\
  84         movl    $ SYS_##name, %eax                      ;\
  85         UNIX_SYSCALL_TRAP                               ;\
  86         jnb     2f                                      ;\
  87         BRANCH_EXTERN(cerror)                           ;\
  88 2:
  89
  90 #if defined(__SYSCALL_32BIT_ARG_BYTES) && ((__SYSCALL_32BIT_ARG_BYTES >= 4) && (__SYSCALL_32BIT_ARG_BYTES <= 20))
  91 #define UNIX_SYSCALL_NONAME(name, nargs, cerror)                        \
  92         movl    $(SYS_##name | (__SYSCALL_32BIT_ARG_BYTES << I386_SYSCALL_ARG_BYTES_SHIFT)), %eax               ;\
  93         UNIX_SYSCALL_SYSENTER                                   ;\
  94         jnb     2f                                              ;\
  95         BRANCH_EXTERN(cerror)                                   ;\
  96 2:
  97 #else /* __SYSCALL_32BIT_ARG_BYTES < 4 || > 20 */
  98 #define UNIX_SYSCALL_NONAME(name, nargs, cerror)                \
  99         .globl  cerror                                  ;\
 100         movl    $ SYS_##name, %eax                      ;\
 101         UNIX_SYSCALL_SYSENTER                           ;\
 102         jnb     2f                                      ;\
 103         BRANCH_EXTERN(cerror)                           ;\
 104 2:
 105 #endif
 106
 107 #define UNIX_SYSCALL_INT_NONAME(name, nargs)            \
 108         .globl  cerror                                  ;\
 109         movl    $ SYS_##name, %eax                      ;\
 110         UNIX_SYSCALL_TRAP                               ;\
 111         jnb     2f                                      ;\
 112         BRANCH_EXTERN(cerror_nocancel)                          ;\
 113 2:
 114
 115 #define PSEUDO(pseudo, name, nargs, cerror)                     \
 116 LEAF(pseudo, 0)                                 ;\
 117         UNIX_SYSCALL_NONAME(name, nargs, cerror)
 118
 119 #define PSEUDO_INT(pseudo, name, nargs)                 \
 120 LEAF(pseudo, 0)                                 ;\
 121         UNIX_SYSCALL_INT_NONAME(name, nargs)
 122
 123 #define __SYSCALL2(pseudo, name, nargs, cerror)                 \
 124         PSEUDO(pseudo, name, nargs, cerror)                     ;\
 125         ret
 126
 127 #define __SYSCALL(pseudo, name, nargs)                  \
 128         PSEUDO(pseudo, name, nargs, cerror)                     ;\
 129         ret
 130
 131 #define __SYSCALL_INT(pseudo, name, nargs)              \
 132         PSEUDO_INT(pseudo, name, nargs)                 ;\
 133         ret
 134
 135 #elif defined(__x86_64__)
 136
 137 #include <architecture/i386/asm_help.h>
 138 #include <mach/i386/syscall_sw.h>
 139
 140 #define UNIX_SYSCALL_SYSCALL    \
 141         movq    %rcx, %r10              ;\
 142         syscall
 143
 144 #define UNIX_SYSCALL(name, nargs)                       \
 145         .globl  cerror                                  ;\
 146 LEAF(_##name, 0)                                        ;\
 147         movl    $ SYSCALL_CONSTRUCT_UNIX(SYS_##name), %eax      ;\
 148         UNIX_SYSCALL_SYSCALL                            ;\
 149         jnb     2f                                      ;\
 150         BRANCH_EXTERN(cerror)                           ;\
 151 2:
 152
 153 #define UNIX_SYSCALL_NONAME(name, nargs, cerror)                \
 154         .globl  cerror                                  ;\
 155         movl    $ SYSCALL_CONSTRUCT_UNIX(SYS_##name), %eax      ;\
 156         UNIX_SYSCALL_SYSCALL                            ;\
 157         jnb     2f                                      ;\
 158         BRANCH_EXTERN(cerror)                           ;\
 159 2:
 160
 161 #define PSEUDO(pseudo, name, nargs, cerror)                     \
 162 LEAF(pseudo, 0)                                 ;\
 163         UNIX_SYSCALL_NONAME(name, nargs, cerror)
 164
 165 #define __SYSCALL2(pseudo, name, nargs, cerror) \
 166         PSEUDO(pseudo, name, nargs, cerror)                     ;\
 167         ret
 168
 169 #define __SYSCALL(pseudo, name, nargs)                  \
 170         PSEUDO(pseudo, name, nargs, cerror)                     ;\
 171         ret
 172
 173 #else
 174 #error Unsupported architecture
 175 #endif
 176