osfmk/mach/i386/syscall_sw.h

   1 /*
   2  * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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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.
  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
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  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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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 #if defined(__i386__)
  64 /*
  65  * Software interrupt codes for 32-bit system call entry:
  66  */
  67 #define UNIX_INT     0x80
  68 #define MACH_INT     0x81
  69 #define MACHDEP_INT  0x82
  70 #define DIAG_INT     0x83
  71
  72 #ifndef KERNEL
  73 /*
  74  * Syscall entry macros for use in libc:
  75  */
  76 #define UNIX_SYSCALL_TRAP       \
  77         int $(UNIX_INT)
  78 #define MACHDEP_SYSCALL_TRAP    \
  79         int $(MACHDEP_INT)
  80
  81 /*
  82  * Macro to generate Mach call stubs in libc:
  83  */
  84
  85 #define kernel_trap(trap_name,trap_number,number_args) \
  86 LEAF(_##trap_name,0) ;\
  87         movl    $##trap_number, %eax    ;\
  88         call    __sysenter_trap         ;\
  89 END(_##trap_name)
  90
  91 #endif
  92 #endif /* defined(__i386__) */
  93
  94 #if defined(__x86_64__)
  95
  96 #ifndef KERNEL
  97
  98 #define UNIX_SYSCALL_TRAP       \
  99         syscall
 100 #define MACHDEP_SYSCALL_TRAP    \
 101         syscall
 102
 103 /*
 104  * Macro to generate Mach call stubs in Libc.
 105  * Existing calls use negative numbers for Mach traps, so
 106  * until we change those and change the 32-bit kernel_trap
 107  * macro above, we negate those numbers here for the 64-bit
 108  * code path.
 109  */
 110 #define kernel_trap(trap_name,trap_number,number_args) \
 111 LEAF(_##trap_name,0) ;\
 112         movq    %rcx, %r10      ;\
 113         movl    $ SYSCALL_CONSTRUCT_MACH(-##trap_number), %eax  ;\
 114         syscall         ;\
 115 END(_##trap_name)
 116
 117 #endif
 118 #endif /* defined(__x86_64__) */
 119
 120 /*
 121  * Syscall classes for 64-bit system call entry.
 122  * For 64-bit users, the 32-bit syscall number is partitioned
 123  * with the high-order bits representing the class and low-order
 124  * bits being the syscall number within that class.
 125  * The high-order 32-bits of the 64-bit syscall number are unused.
 126  * All system classes enter the kernel via the syscall instruction.
 127  *
 128  * These are not #ifdef'd for x86-64 because they might be used for
 129  * 32-bit someday and so the 64-bit comm page in a 32-bit kernel
 130  * can use them.
 131  */
 132 #define SYSCALL_CLASS_SHIFT     24
 133 #define SYSCALL_CLASS_MASK      (0xFF << SYSCALL_CLASS_SHIFT)
 134 #define SYSCALL_NUMBER_MASK     (~SYSCALL_CLASS_MASK)
 135
 136 #define I386_SYSCALL_CLASS_MASK         SYSCALL_CLASS_MASK
 137 #define I386_SYSCALL_ARG_BYTES_SHIFT    (16)
 138 #define I386_SYSCALL_ARG_DWORDS_SHIFT   (I386_SYSCALL_ARG_BYTES_SHIFT + 2)
 139 #define I386_SYSCALL_ARG_BYTES_NUM      (64) /* Must be <= sizeof(uu_arg) */
 140 #define I386_SYSCALL_ARG_DWORDS_MASK    ((I386_SYSCALL_ARG_BYTES_NUM >> 2) -1)
 141 #define I386_SYSCALL_ARG_BYTES_MASK     (((I386_SYSCALL_ARG_BYTES_NUM -1)&~0x3) << I386_SYSCALL_ARG_BYTES_SHIFT)
 142 #define I386_SYSCALL_NUMBER_MASK        (0xFFFF)
 143
 144 #define SYSCALL_CLASS_NONE      0       /* Invalid */
 145 #define SYSCALL_CLASS_MACH      1       /* Mach */
 146 #define SYSCALL_CLASS_UNIX      2       /* Unix/BSD */
 147 #define SYSCALL_CLASS_MDEP      3       /* Machine-dependent */
 148 #define SYSCALL_CLASS_DIAG      4       /* Diagnostics */
 149
 150 /* Macros to simpllfy constructing syscall numbers. */
 151 #define SYSCALL_CONSTRUCT_MACH(syscall_number) \
 152                         ((SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT) | \
 153                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 154 #define SYSCALL_CONSTRUCT_UNIX(syscall_number) \
 155                         ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | \
 156                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 157 #define SYSCALL_CONSTRUCT_MDEP(syscall_number) \
 158                         ((SYSCALL_CLASS_MDEP << SYSCALL_CLASS_SHIFT) | \
 159                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 160 #define SYSCALL_CONSTRUCT_DIAG(syscall_number) \
 161                         ((SYSCALL_CLASS_DIAG << SYSCALL_CLASS_SHIFT) | \
 162                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 163
 164 #endif  /* _MACH_I386_SYSCALL_SW_H_ */
 165
 166 #endif  /* PRIVATE */