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 #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                            ;\
  65 LEAF(_##name, 0)                                        ;\
  66         movl    $ SYS_##name, %eax                      ;\
  67         UNIX_SYSCALL_SYSENTER                           ;\
  68         jnb     2f                                      ;\
  69         BRANCH_EXTERN(tramp_cerror)                     ;\
  70 2:
  71
  72 #define UNIX_SYSCALL_INT(name, nargs)                   \
  73         .globl  tramp_cerror                            ;\
  74 LEAF(_##name, 0)                                        ;\
  75         movl    $ SYS_##name, %eax                      ;\
  76         UNIX_SYSCALL_TRAP                               ;\
  77         jnb     2f                                      ;\
  78         BRANCH_EXTERN(tramp_cerror)                     ;\
  79 2:
  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)                           ;\
  87 2:
  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)                   ;\
  94 2:
  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)            ;\
 103 2:
 104
 105 #define PSEUDO(pseudo, name, nargs, cerror)     \
 106 LEAF(pseudo, 0)                                 ;\
 107         UNIX_SYSCALL_NONAME(name, nargs, cerror)
 108
 109 #define PSEUDO_INT(pseudo, name, nargs)         \
 110 LEAF(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                                                          ;\
 136 LEAF(_##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)                                                  ;\
 142 2:
 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)                                                ;\
 151 2:
 152
 153 #define PSEUDO(pseudo, name, nargs, cerror)                     \
 154 LEAF(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