osfmk/mach/i386/syscall_sw.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
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   8  * Version 2.0 (the 'License'). You may not use this file except in
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  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
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  13  * terms of an Apple operating system software license agreement.
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  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
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  23  * Please see the License for the specific language governing rights and
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 #ifdef  PRIVATE
  57
  58 #ifndef _MACH_I386_SYSCALL_SW_H_
  59 #define _MACH_I386_SYSCALL_SW_H_
  60
  61 #include <architecture/i386/asm_help.h>
  62
  63 /*
  64  * Software interrupt codes for 32-bit system call entry:
  65  */
  66 #define UNIX_INT     0x80
  67 #define MACH_INT     0x81
  68 #define MACHDEP_INT  0x82
  69 #define DIAG_INT     0x83
  70
  71 #if defined(__i386__)
  72
  73 #ifndef KERNEL
  74 /*
  75  * Syscall entry macros for use in libc:
  76  */
  77 #define UNIX_SYSCALL_TRAP       \
  78         int $(UNIX_INT)
  79 #define MACHDEP_SYSCALL_TRAP    \
  80         int $(MACHDEP_INT)
  81
  82 /*
  83  * Macro to generate Mach call stubs in libc:
  84  */
  85
  86 #define kernel_trap(trap_name,trap_number,number_args) \
  87 LEAF(_##trap_name,0) ;\
  88         movl    $##trap_number, %eax    ;\
  89         call    __sysenter_trap         ;\
  90 END(_##trap_name)
  91
  92 #endif /* !KERNEL */
  93
  94 #endif /* defined(__i386__) */
  95
  96 #if defined(__x86_64__)
  97
  98 #ifndef KERNEL
  99
 100 #define UNIX_SYSCALL_TRAP       \
 101         syscall
 102 #define MACHDEP_SYSCALL_TRAP    \
 103         syscall
 104
 105 /*
 106  * Macro to generate Mach call stubs in Libc.
 107  * Existing calls use negative numbers for Mach traps, so
 108  * until we change those and change the 32-bit kernel_trap
 109  * macro above, we negate those numbers here for the 64-bit
 110  * code path.
 111  */
 112 #define kernel_trap(trap_name,trap_number,number_args) \
 113 LEAF(_##trap_name,0) ;\
 114         movq    %rcx, %r10      ;\
 115         movl    $ SYSCALL_CONSTRUCT_MACH(-##trap_number), %eax  ;\
 116         syscall         ;\
 117 END(_##trap_name)
 118
 119 #endif /* !KERNEL */
 120
 121 #endif /* defined(__x86_64__) */
 122
 123 /*
 124  * Syscall classes for 64-bit system call entry.
 125  * For 64-bit users, the 32-bit syscall number is partitioned
 126  * with the high-order bits representing the class and low-order
 127  * bits being the syscall number within that class.
 128  * The high-order 32-bits of the 64-bit syscall number are unused.
 129  * All system classes enter the kernel via the syscall instruction.
 130  *
 131  * These are not #ifdef'd for x86-64 because they might be used for
 132  * 32-bit someday and so the 64-bit comm page in a 32-bit kernel
 133  * can use them.
 134  */
 135 #define SYSCALL_CLASS_SHIFT     24
 136 #define SYSCALL_CLASS_MASK      (0xFF << SYSCALL_CLASS_SHIFT)
 137 #define SYSCALL_NUMBER_MASK     (~SYSCALL_CLASS_MASK)
 138
 139 #define I386_SYSCALL_CLASS_MASK         SYSCALL_CLASS_MASK
 140 #define I386_SYSCALL_ARG_BYTES_SHIFT    (16)
 141 #define I386_SYSCALL_ARG_DWORDS_SHIFT   (I386_SYSCALL_ARG_BYTES_SHIFT + 2)
 142 #define I386_SYSCALL_ARG_BYTES_NUM      (64) /* Must be <= sizeof(uu_arg) */
 143 #define I386_SYSCALL_ARG_DWORDS_MASK    ((I386_SYSCALL_ARG_BYTES_NUM >> 2) -1)
 144 #define I386_SYSCALL_ARG_BYTES_MASK     (((I386_SYSCALL_ARG_BYTES_NUM -1)&~0x3) << I386_SYSCALL_ARG_BYTES_SHIFT)
 145 #define I386_SYSCALL_NUMBER_MASK        (0xFFFF)
 146
 147 #define SYSCALL_CLASS_NONE      0       /* Invalid */
 148 #define SYSCALL_CLASS_MACH      1       /* Mach */
 149 #define SYSCALL_CLASS_UNIX      2       /* Unix/BSD */
 150 #define SYSCALL_CLASS_MDEP      3       /* Machine-dependent */
 151 #define SYSCALL_CLASS_DIAG      4       /* Diagnostics */
 152 #define SYSCALL_CLASS_IPC       5       /* Mach IPC */
 153
 154 /* Macros to simpllfy constructing syscall numbers. */
 155 #define SYSCALL_CONSTRUCT_MACH(syscall_number) \
 156                         ((SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT) | \
 157                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 158 #define SYSCALL_CONSTRUCT_UNIX(syscall_number) \
 159                         ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | \
 160                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 161 #define SYSCALL_CONSTRUCT_MDEP(syscall_number) \
 162                         ((SYSCALL_CLASS_MDEP << SYSCALL_CLASS_SHIFT) | \
 163                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 164 #define SYSCALL_CONSTRUCT_DIAG(syscall_number) \
 165                         ((SYSCALL_CLASS_DIAG << SYSCALL_CLASS_SHIFT) | \
 166                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 167
 168 #endif  /* _MACH_I386_SYSCALL_SW_H_ */
 169
 170 #endif  /* PRIVATE */