osfmk/mach/i386/syscall_sw.h

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
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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 /*
  57  */
  58
  59 #ifdef  PRIVATE
  60
  61 #ifndef _MACH_I386_SYSCALL_SW_H_
  62 #define _MACH_I386_SYSCALL_SW_H_
  63
  64 #include <architecture/i386/asm_help.h>
  65
  66 #if defined(__i386__)
  67 /*
  68  * Software interrupt codes for 32-bit system call entry:
  69  */
  70 #define UNIX_INT     0x80
  71 #define MACH_INT     0x81
  72 #define MACHDEP_INT  0x82
  73 #define DIAG_INT     0x83
  74
  75 #ifndef KERNEL
  76 /*
  77  * Syscall entry macros for use in libc:
  78  * [Note that the nop padding is temporary during 4/4 transition.]
  79  */
  80 #define SYSENTER_PAD    nop;nop;
  81 #define SYSCALL_PAD     nop;nop;nop;nop;nop;
  82 #define UNIX_SYSCALL_TRAP       \
  83         SYSCALL_PAD             \
  84         int $(UNIX_INT)
  85 #define MACHDEP_SYSCALL_TRAP    \
  86         SYSCALL_PAD             \
  87         int $(MACHDEP_INT)
  88
  89 /*
  90  * Macro to generate Mach call stubs in libc:
  91  */
  92 #define kernel_trap(trap_name,trap_number,number_args) \
  93 LEAF(_##trap_name,0) ;\
  94         movl    $##trap_number,%eax     ;\
  95         int             $(MACH_INT)             ;\
  96 END(_##trap_name)
  97
  98 #endif
  99 #endif /* defined(__i386__) */
 100
 101 #if defined(__x86_64__)
 102
 103 #ifndef KERNEL
 104
 105 #define UNIX_SYSCALL_TRAP       \
 106         syscall
 107 #define MACHDEP_SYSCALL_TRAP    \
 108         syscall
 109
 110 /*
 111  * Macro to generate Mach call stubs in Libc.
 112  * Existing calls use negative numbers for Mach traps, so
 113  * until we change those and change the 32-bit kernel_trap
 114  * macro above, we negate those numbers here for the 64-bit
 115  * code path.
 116  */
 117 #define kernel_trap(trap_name,trap_number,number_args) \
 118 LEAF(_##trap_name,0) ;\
 119         movq    %rcx, %r10      ;\
 120         movl    $ SYSCALL_CONSTRUCT_MACH(-##trap_number), %eax  ;\
 121         syscall         ;\
 122 END(_##trap_name)
 123
 124 #endif
 125 #endif /* defined(__x86_64__) */
 126
 127 /*
 128  * Syscall classes for 64-bit system call entry.
 129  * For 64-bit users, the 32-bit syscall number is partitioned
 130  * with the high-order bits representing the class and low-order
 131  * bits being the syscall number within that class.
 132  * The high-order 32-bits of the 64-bit syscall number are unused.
 133  * All system classes enter the kernel via the syscall instruction.
 134  *
 135  * These are not #ifdef'd for x86-64 because they might be used for
 136  * 32-bit someday and so the 64-bit comm page in a 32-bit kernel
 137  * can use them.
 138  */
 139 #define SYSCALL_CLASS_SHIFT     24
 140 #define SYSCALL_CLASS_MASK      (0xFF << SYSCALL_CLASS_SHIFT)
 141 #define SYSCALL_NUMBER_MASK     (~SYSCALL_CLASS_MASK)
 142
 143 #define SYSCALL_CLASS_NONE      0       /* Invalid */
 144 #define SYSCALL_CLASS_MACH      1       /* Mach */
 145 #define SYSCALL_CLASS_UNIX      2       /* Unix/BSD */
 146 #define SYSCALL_CLASS_MDEP      3       /* Machine-dependent */
 147 #define SYSCALL_CLASS_DIAG      4       /* Diagnostics */
 148
 149 /* Macros to simpllfy constructing syscall numbers. */
 150 #define SYSCALL_CONSTRUCT_MACH(syscall_number) \
 151                         ((SYSCALL_CLASS_MACH << SYSCALL_CLASS_SHIFT) | \
 152                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 153 #define SYSCALL_CONSTRUCT_UNIX(syscall_number) \
 154                         ((SYSCALL_CLASS_UNIX << SYSCALL_CLASS_SHIFT) | \
 155                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 156 #define SYSCALL_CONSTRUCT_MDEP(syscall_number) \
 157                         ((SYSCALL_CLASS_MDEP << SYSCALL_CLASS_SHIFT) | \
 158                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 159 #define SYSCALL_CONSTRUCT_DIAG(syscall_number) \
 160                         ((SYSCALL_CLASS_DIAG << SYSCALL_CLASS_SHIFT) | \
 161                          (SYSCALL_NUMBER_MASK & (syscall_number)))
 162
 163 #endif  /* _MACH_I386_SYSCALL_SW_H_ */
 164
 165 #endif  /* PRIVATE */