ppc/sys/SYS.h

   1 /*
   2  * Copyright (c) 1999-2004 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 /* Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  24  *
  25  *      File:   SYS.h
  26  *
  27  *      Definition of the user side of the UNIX system call interface
  28  *      for M98K.
  29  *
  30  *      Errors are flagged by the location of the trap return (ie., which
  31  *      instruction is executed upon rfi):
  32  *
  33  *              SC PC + 4:      Error (typically branch to cerror())
  34  *              SC PC + 8:      Success
  35  *
  36  * HISTORY
  37  * 18-Nov-92    Ben Fathi (benf@next.com)
  38  *      Ported to m98k.
  39  *
  40  *  9-Jan-92    Peter King (king@next.com)
  41  *      Created.
  42  */
  43
  44 /*
  45  * Header files.
  46  */
  47 #include <architecture/ppc/mode_independent_asm.h>
  48 #import <sys/syscall.h>
  49
  50 /* From rhapsody kernel mach/ppc/syscall_sw.h */
  51 #define kernel_trap_args_0
  52 #define kernel_trap_args_1
  53 #define kernel_trap_args_2
  54 #define kernel_trap_args_3
  55 #define kernel_trap_args_4
  56 #define kernel_trap_args_5
  57 #define kernel_trap_args_6
  58 #define kernel_trap_args_7
  59
  60 /*
  61  * simple_kernel_trap -- Mach system calls with 8 or less args
  62  * Args are passed in a0 - a7, system call number in r0.
  63  * Do a "sc" instruction to enter kernel.
  64  */
  65 #define simple_kernel_trap(trap_name, trap_number)      \
  66         .globl  _##trap_name                            @\
  67 _##trap_name:                                           @\
  68         li      r0,trap_number                           @\
  69         sc                                               @\
  70         blr
  71
  72 #define kernel_trap_0(trap_name,trap_number)             \
  73         simple_kernel_trap(trap_name,trap_number)
  74
  75 #define kernel_trap_1(trap_name,trap_number)             \
  76         simple_kernel_trap(trap_name,trap_number)
  77
  78 #define kernel_trap_2(trap_name,trap_number)             \
  79         simple_kernel_trap(trap_name,trap_number)
  80
  81 #define kernel_trap_3(trap_name,trap_number)             \
  82         simple_kernel_trap(trap_name,trap_number)
  83
  84 #define kernel_trap_4(trap_name,trap_number)             \
  85         simple_kernel_trap(trap_name,trap_number)
  86
  87 #define kernel_trap_5(trap_name,trap_number)             \
  88         simple_kernel_trap(trap_name,trap_number)
  89
  90 #define kernel_trap_6(trap_name,trap_number)             \
  91         simple_kernel_trap(trap_name,trap_number)
  92
  93 #define kernel_trap_7(trap_name,trap_number)             \
  94         simple_kernel_trap(trap_name,trap_number)
  95
  96 #define kernel_trap_8(trap_name,trap_number)             \
  97         simple_kernel_trap(trap_name,trap_number)
  98
  99 #define kernel_trap_9(trap_name,trap_number)             \
 100         simple_kernel_trap(trap_name,trap_number)
 101
 102 /* End of rhapsody kernel mach/ppc/syscall_sw.h */
 103
 104 /*
 105  * Macros.
 106  */
 107
 108 /*
 109  * This is the same as SYSCALL, but it can call an alternate error
 110  * return function.  It's generic to support potential future callers.
 111  */
 112 #define SYSCALL_ERR(name, nargs, error_ret)             \
 113         .globl  error_ret                       @\
 114     MI_ENTRY_POINT(_##name)     @\
 115         kernel_trap_args_##nargs    @\
 116         li      r0,SYS_##name                   @\
 117         sc                          @\
 118         b       1f                      @\
 119         blr                         @\
 120 1:      MI_BRANCH_EXTERNAL(error_ret)
 121
 122 #define SYSCALL(name, nargs)                    \
 123         .globl  cerror                          @\
 124     MI_ENTRY_POINT(_##name)     @\
 125         kernel_trap_args_##nargs    @\
 126         li      r0,SYS_##name                   @\
 127         sc                          @\
 128         b       1f                      @\
 129         blr                         @\
 130 1:      MI_BRANCH_EXTERNAL(cerror)
 131
 132
 133 #define SYSCALL_NONAME(name, nargs)             \
 134         .globl  cerror                          @\
 135         kernel_trap_args_##nargs    @\
 136         li      r0,SYS_##name                   @\
 137         sc                          @\
 138         b       1f                      @\
 139         b       2f                      @\
 140 1:      MI_BRANCH_EXTERNAL(cerror)  @\
 141 2:
 142
 143
 144 #define PSEUDO(pseudo, name, nargs)             \
 145     .globl  _##pseudo           @\
 146     .text                       @\
 147     .align  2                   @\
 148 _##pseudo:                      @\
 149         SYSCALL_NONAME(name, nargs)
 150
 151 #define PSEUDO_ERR(pseudo, name, nargs, error_ret)              \
 152     .globl  _##pseudo           @\
 153         .globl  error_ret                       @\
 154     .text                       @\
 155     .align  2                   @\
 156 _##pseudo:                      @\
 157         kernel_trap_args_##nargs    @\
 158         li      r0,SYS_##name                   @\
 159         sc                          @\
 160         b       1f                      @\
 161         blr                         @\
 162 1:      MI_BRANCH_EXTERNAL(error_ret)
 163
 164
 165 #undef END
 166 #import <mach/ppc/syscall_sw.h>