osfmk/mach/i386/syscall_sw.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52
  53 #ifdef  PRIVATE
  54
  55 #ifndef _MACH_I386_SYSCALL_SW_H_
  56 #define _MACH_I386_SYSCALL_SW_H_
  57
  58 #include <architecture/i386/asm_help.h>
  59
  60 #if defined(__i386__)
  61 /*
  62  * Software interrupt codes for 32-bit system call entry:
  63  */
  64 #define UNIX_INT     0x80
  65 #define MACH_INT     0x81
  66 #define MACHDEP_INT  0x82
  67 #define DIAG_INT     0x83
  68
  69 #ifndef KERNEL
  70 /*
  71  * Syscall entry macros for use in libc:
  72  * [Note that the nop padding is temporary during 4/4 transition.]
  73  */
  74 #define SYSENTER_PAD    nop;nop;
  75 #define SYSCALL_PAD     nop;nop;nop;nop;nop;
  76 #define UNIX_SYSCALL_TRAP       \
  77         SYSCALL_PAD             \
  78         int $(UNIX_INT)
  79 #define MACHDEP_SYSCALL_TRAP    \
  80         SYSCALL_PAD             \
  81         int $(MACHDEP_INT)
  82
  83 /*
  84  * Macro to generate Mach call stubs in libc:
  85  */
  86 #define kernel_trap(trap_name,trap_number,number_args) \
  87 LEAF(_##trap_name,0) ;\
  88         movl    $##trap_number,%eax     ;\
  89         int             $(MACH_INT)             ;\
  90 END(_##trap_name)
  91
  92 #endif
  93 #endif /* defined(__i386__) */
  94
  95 #if defined(__x86_64__)
  96
  97 #ifndef KERNEL
  98
  99 #define UNIX_SYSCALL_TRAP       \
 100         syscall
 101 #define MACHDEP_SYSCALL_TRAP    \
 102         syscall
 103
 104 /*
 105  * Macro to generate Mach call stubs in Libc.
 106  * Existing calls use negative numbers for Mach traps, so
 107  * until we change those and change the 32-bit kernel_trap
 108  * macro above, we negate those numbers here for the 64-bit
 109  * code path.
 110  */
 111 #define kernel_trap(trap_name,trap_number,number_args) \
 112 LEAF(_##trap_name,0) ;\
 113         movq    %rcx, %r10      ;\
 114         movl    $ SYSCALL_CONSTRUCT_MACH(-##trap_number), %eax  ;\
 115         syscall         ;\
 116 END(_##trap_name)
 117
 118 #endif
 119 #endif /* defined(__x86_64__) */
 120
 121 /*
 122  * Syscall classes for 64-bit system call entry.
 123  * For 64-bit users, the 32-bit syscall number is partitioned
 124  * with the high-order bits representing the class and low-order
 125  * bits being the syscall number within that class.
 126  * The high-order 32-bits of the 64-bit syscall number are unused.
 127  * All system classes enter the kernel via the syscall instruction.
 128  *
 129  * These are not #ifdef'd for x86-64 because they might be used for
 130  * 32-bit someday and so the 64-bit comm page in a 32-bit kernel
 131  * can use them.
 132  */
 133 #define SYSCALL_CLASS_SHIFT     24
 134 #define SYSCALL_CLASS_MASK      (0xFF << SYSCALL_CLASS_SHIFT)
 135 #define SYSCALL_NUMBER_MASK     (~SYSCALL_CLASS_MASK)
 136
 137 #define SYSCALL_CLASS_NONE      0       /* Invalid */
 138 #define SYSCALL_CLASS_MACH      1       /* Mach */
 139 #define SYSCALL_CLASS_UNIX      2       /* Unix/BSD */
 140 #define SYSCALL_CLASS_MDEP      3       /* Machine-dependent */
 141 #define SYSCALL_CLASS_DIAG      4       /* Diagnostics */
 142
 143 /* Macros to simpllfy constructing syscall numbers. */
 144 #define SYSCALL_CONSTRUCT_MACH(syscall_number) \
 145                         ((SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT) | \
 146                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 147 #define SYSCALL_CONSTRUCT_UNIX(syscall_number) \
 148                         ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | \
 149                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 150 #define SYSCALL_CONSTRUCT_MDEP(syscall_number) \
 151                         ((SYSCALL_CLASS_MDEP << SYSCALL_CLASS_SHIFT) | \
 152                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 153 #define SYSCALL_CONSTRUCT_DIAG(syscall_number) \
 154                         ((SYSCALL_CLASS_DIAG << SYSCALL_CLASS_SHIFT) | \
 155                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 156
 157 #endif  /* _MACH_I386_SYSCALL_SW_H_ */
 158
 159 #endif  /* PRIVATE */