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  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1992 NeXT Computer, Inc.
  27  *
  28  * Intel386 Family:     Processor exception frame.
  29  *
  30  * HISTORY
  31  *
  32  * 31 August 1992 ? at NeXT
  33  *      Added v86 mode stuff.
  34  *
  35  * 8 June 1992 ? at NeXT
  36  *      Changed name of write field in err_code_t
  37  *      which collided with write() in shlib.
  38  *
  39  * 30 March 1992 ? at NeXT
  40  *      Created.
  41  */
  42
  43 /*
  44  * Format of the error code
  45  * generated by the hardware
  46  * for certain exceptions.
  47  */
  48
  49 typedef union err_code {
  50     struct err_code_normal {
  51         unsigned int    ext     :1,
  52                         tbl     :2,
  53 #define ERR_GDT         0
  54 #define ERR_IDT         1
  55 #define ERR_LDT         2
  56                         index   :13,
  57                                 :16;
  58     } normal;
  59     struct err_code_pgfault {
  60         unsigned int    prot    :1,
  61                         wrtflt  :1,
  62                         user    :1,
  63                                 :29;
  64     } pgfault;
  65 } err_code_t;
  66
  67 #include <architecture/i386/sel.h>
  68
  69 /*
  70  * The actual hardware exception frame
  71  * is variable in size.  An error code is
  72  * only pushed for certain exceptions.
  73  * Previous stack information is only
  74  * pushed for exceptions that cause a
  75  * change in privilege level.  The dpl
  76  * field of the saved CS selector can be
  77  * used to determine whether this is the
  78  * case.  If the interrupted task was
  79  * executing in v86 mode, then the data
  80  * segment registers are also present in
  81  * the exception frame (in addition to
  82  * previous stack information).  This
  83  * case can be determined by examining
  84  * eflags.
  85  */
  86
  87 typedef struct except_frame {
  88     err_code_t          err;
  89     unsigned int        eip;
  90     sel_t               cs;
  91     unsigned int                :0;
  92     unsigned int        eflags;
  93     unsigned int        esp;
  94     sel_t               ss;
  95     unsigned int                :0;
  96     unsigned short      v_es;
  97     unsigned int                :0;
  98     unsigned short      v_ds;
  99     unsigned int                :0;
 100     unsigned short      v_fs;
 101     unsigned int                :0;
 102     unsigned short      v_gs;
 103     unsigned int                :0;
 104 } except_frame_t;
 105
 106 /*
 107  * Values in eflags.
 108  */
 109
 110 #ifndef EFL_CF  /* FIXME */
 111 #define EFL_CF          0x00001
 112 #define EFL_PF          0x00004
 113 #define EFL_AF          0x00010
 114 #define EFL_ZF          0x00040
 115 #define EFL_SF          0x00080
 116 #define EFL_TF          0x00100
 117 #define EFL_IF          0x00200
 118 #define EFL_DF          0x00400
 119 #define EFL_OF          0x00800
 120 #define EFL_IOPL        0x03000
 121 #define EFL_NT          0x04000
 122 #define EFL_RF          0x10000
 123 #define EFL_VM          0x20000
 124 #define EFL_AC          0x40000
 125 #endif
 126
 127 #define EFL_CLR         0xfff88028
 128 #define EFL_SET         0x00000002