EXTERNAL_HEADERS/architecture/i386/frame.h

   1 /*
   2  * Copyright (c) 2000 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 /*
  24  * Copyright (c) 1992 NeXT Computer, Inc.
  25  *
  26  * Intel386 Family:     Processor exception frame.
  27  *
  28  * HISTORY
  29  *
  30  * 31 August 1992 ? at NeXT
  31  *      Added v86 mode stuff.
  32  *
  33  * 8 June 1992 ? at NeXT
  34  *      Changed name of write field in err_code_t
  35  *      which collided with write() in shlib.
  36  *
  37  * 30 March 1992 ? at NeXT
  38  *      Created.
  39  */
  40
  41 /*
  42  * Format of the error code
  43  * generated by the hardware
  44  * for certain exceptions.
  45  */
  46
  47 typedef union err_code {
  48     struct err_code_normal {
  49         unsigned int    ext     :1,
  50                         tbl     :2,
  51 #define ERR_GDT         0
  52 #define ERR_IDT         1
  53 #define ERR_LDT         2
  54                         index   :13,
  55                                 :16;
  56     } normal;
  57     struct err_code_pgfault {
  58         unsigned int    prot    :1,
  59                         wrtflt  :1,
  60                         user    :1,
  61                                 :29;
  62     } pgfault;
  63 } err_code_t;
  64
  65 #include <architecture/i386/sel.h>
  66
  67 /*
  68  * The actual hardware exception frame
  69  * is variable in size.  An error code is
  70  * only pushed for certain exceptions.
  71  * Previous stack information is only
  72  * pushed for exceptions that cause a
  73  * change in privilege level.  The dpl
  74  * field of the saved CS selector can be
  75  * used to determine whether this is the
  76  * case.  If the interrupted task was
  77  * executing in v86 mode, then the data
  78  * segment registers are also present in
  79  * the exception frame (in addition to
  80  * previous stack information).  This
  81  * case can be determined by examining
  82  * eflags.
  83  */
  84
  85 typedef struct except_frame {
  86     err_code_t          err;
  87     unsigned int        eip;
  88     sel_t               cs;
  89     unsigned int                :0;
  90     unsigned int        eflags;
  91     unsigned int        esp;
  92     sel_t               ss;
  93     unsigned int                :0;
  94     unsigned short      v_es;
  95     unsigned int                :0;
  96     unsigned short      v_ds;
  97     unsigned int                :0;
  98     unsigned short      v_fs;
  99     unsigned int                :0;
 100     unsigned short      v_gs;
 101     unsigned int                :0;
 102 } except_frame_t;
 103
 104 /*
 105  * Values in eflags.
 106  */
 107
 108 #ifndef EFL_CF  /* FIXME */
 109 #define EFL_CF          0x00001
 110 #define EFL_PF          0x00004
 111 #define EFL_AF          0x00010
 112 #define EFL_ZF          0x00040
 113 #define EFL_SF          0x00080
 114 #define EFL_TF          0x00100
 115 #define EFL_IF          0x00200
 116 #define EFL_DF          0x00400
 117 #define EFL_OF          0x00800
 118 #define EFL_IOPL        0x03000
 119 #define EFL_NT          0x04000
 120 #define EFL_RF          0x10000
 121 #define EFL_VM          0x20000
 122 #define EFL_AC          0x40000
 123 #endif
 124
 125 #define EFL_CLR         0xfff88028
 126 #define EFL_SET         0x00000002