i386/sys/SYS.h

   1 /*
   2  * Copyright (c) 1999-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
  25  *
  26  *      File:   SYS.h
  27  *
  28  *      Definition of the user side of the UNIX system call interface
  29  *      for i386.
  30  *
  31  * HISTORY
  32  *  12-3-92     Bruce Martin (Bruce_Martin@next.com)
  33  *      Created.
  34  */
  35
  36 /*
  37  * Headers
  38  */
  39 #include <sys/syscall.h>
  40 #include <architecture/i386/asm_help.h>
  41 #include <mach/i386/syscall_sw.h>
  42
  43 /*
  44  * We have two entry points. int's is used for syscalls which need to preserve
  45  * %ecx across the call, or return a 64-bit value in %eax:%edx. sysenter is used
  46  * for the majority of syscalls which just return a value in %eax.
  47  */
  48
  49 #define UNIX_SYSCALL_SYSENTER   SYSENTER_PAD call __sysenter_trap
  50
  51 /*
  52  * This is the same as UNIX_SYSCALL, but it can call an alternate error
  53  * return function.  It's generic to support potential future callers.
  54  */
  55 #define UNIX_SYSCALL_ERR(name, nargs,error_ret)         \
  56         .globl  error_ret                               ;\
  57 LEAF(_##name, 0)                                        ;\
  58         movl    $ SYS_##name, %eax                      ;\
  59         UNIX_SYSCALL_SYSENTER                           ;\
  60         jnb     2f                                      ;\
  61         BRANCH_EXTERN(error_ret)                        ;\
  62 2:
  63
  64 #define UNIX_SYSCALL(name, nargs)                       \
  65         .globl  cerror                                  ;\
  66 LEAF(_##name, 0)                                        ;\
  67         movl    $ SYS_##name, %eax                      ;\
  68         UNIX_SYSCALL_SYSENTER                           ;\
  69         jnb     2f                                      ;\
  70         BRANCH_EXTERN(cerror)                           ;\
  71 2:
  72
  73 #define UNIX_SYSCALL_INT(name, nargs)                   \
  74         .globl  cerror                                  ;\
  75 LEAF(_##name, 0)                                        ;\
  76         movl    $ SYS_##name, %eax                      ;\
  77         UNIX_SYSCALL_TRAP                               ;\
  78         jnb     2f                                      ;\
  79         BRANCH_EXTERN(cerror)                           ;\
  80 2:
  81
  82 #define UNIX_SYSCALL_NONAME(name, nargs)                \
  83         .globl  cerror                                  ;\
  84         movl    $ SYS_##name, %eax                      ;\
  85         UNIX_SYSCALL_SYSENTER                           ;\
  86         jnb     2f                                      ;\
  87         BRANCH_EXTERN(cerror)                           ;\
  88 2:
  89
  90 #define UNIX_SYSCALL_INT_NONAME(name, nargs)            \
  91         .globl  cerror                                  ;\
  92         movl    $ SYS_##name, %eax                      ;\
  93         UNIX_SYSCALL_TRAP                               ;\
  94         jnb     2f                                      ;\
  95         BRANCH_EXTERN(cerror)                           ;\
  96 2:
  97
  98 #define PSEUDO(pseudo, name, nargs)                     \
  99 LEAF(_##pseudo, 0)                                      ;\
 100         UNIX_SYSCALL_NONAME(name, nargs)
 101
 102 #define PSEUDO_ERR(pseudo, name, nargs, error_ret)      \
 103         .globl  error_ret                               ;\
 104 LEAF(_##pseudo, 0)                                      ;\
 105         movl    $ SYS_##name, %eax                      ;\
 106         UNIX_SYSCALL_SYSENTER                           ;\
 107         jnb     2f                                      ;\
 108         BRANCH_EXTERN(error_ret)                        ;\
 109 2: