EXTERNAL_HEADERS/architecture/i386/frame.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  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
  12  * circumvent, violate, or enable the circumvention or violation of, any
  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
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1992 NeXT Computer, Inc.
  30  *
  31  * Intel386 Family:     Processor exception frame.
  32  *
  33  * HISTORY
  34  *
  35  * 31 August 1992 ? at NeXT
  36  *      Added v86 mode stuff.
  37  *
  38  * 8 June 1992 ? at NeXT
  39  *      Changed name of write field in err_code_t
  40  *      which collided with write() in shlib.
  41  *
  42  * 30 March 1992 ? at NeXT
  43  *      Created.
  44  */
  45
  46 /*
  47  * Format of the error code
  48  * generated by the hardware
  49  * for certain exceptions.
  50  */
  51
  52 typedef union err_code {
  53     struct err_code_normal {
  54         unsigned int    ext     :1,
  55                         tbl     :2,
  56 #define ERR_GDT         0
  57 #define ERR_IDT         1
  58 #define ERR_LDT         2
  59                         index   :13,
  60                                 :16;
  61     } normal;
  62     struct err_code_pgfault {
  63         unsigned int    prot    :1,
  64                         wrtflt  :1,
  65                         user    :1,
  66                                 :29;
  67     } pgfault;
  68 } err_code_t;
  69
  70 #include <architecture/i386/sel.h>
  71
  72 /*
  73  * The actual hardware exception frame
  74  * is variable in size.  An error code is
  75  * only pushed for certain exceptions.
  76  * Previous stack information is only
  77  * pushed for exceptions that cause a
  78  * change in privilege level.  The dpl
  79  * field of the saved CS selector can be
  80  * used to determine whether this is the
  81  * case.  If the interrupted task was
  82  * executing in v86 mode, then the data
  83  * segment registers are also present in
  84  * the exception frame (in addition to
  85  * previous stack information).  This
  86  * case can be determined by examining
  87  * eflags.
  88  */
  89
  90 typedef struct except_frame {
  91     err_code_t          err;
  92     unsigned int        eip;
  93     sel_t               cs;
  94     unsigned int                :0;
  95     unsigned int        eflags;
  96     unsigned int        esp;
  97     sel_t               ss;
  98     unsigned int                :0;
  99     unsigned short      v_es;
 100     unsigned int                :0;
 101     unsigned short      v_ds;
 102     unsigned int                :0;
 103     unsigned short      v_fs;
 104     unsigned int                :0;
 105     unsigned short      v_gs;
 106     unsigned int                :0;
 107 } except_frame_t;
 108
 109 /*
 110  * Values in eflags.
 111  */
 112
 113 #ifndef EFL_CF  /* FIXME */
 114 #define EFL_CF          0x00001
 115 #define EFL_PF          0x00004
 116 #define EFL_AF          0x00010
 117 #define EFL_ZF          0x00040
 118 #define EFL_SF          0x00080
 119 #define EFL_TF          0x00100
 120 #define EFL_IF          0x00200
 121 #define EFL_DF          0x00400
 122 #define EFL_OF          0x00800
 123 #define EFL_IOPL        0x03000
 124 #define EFL_NT          0x04000
 125 #define EFL_RF          0x10000
 126 #define EFL_VM          0x20000
 127 #define EFL_AC          0x40000
 128 #endif
 129
 130 #define EFL_CLR         0xfff88028
 131 #define EFL_SET         0x00000002