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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1992 NeXT Computer, Inc.
  24  *
  25  * Intel386 Family:     Processor exception frame.
  26  *
  27  * HISTORY
  28  *
  29  * 31 August 1992 ? at NeXT
  30  *      Added v86 mode stuff.
  31  *
  32  * 8 June 1992 ? at NeXT
  33  *      Changed name of write field in err_code_t
  34  *      which collided with write() in shlib.
  35  *
  36  * 30 March 1992 ? at NeXT
  37  *      Created.
  38  */
  39
  40 /*
  41  * Format of the error code
  42  * generated by the hardware
  43  * for certain exceptions.
  44  */
  45
  46 typedef union err_code {
  47     struct err_code_normal {
  48         unsigned int    ext     :1,
  49                         tbl     :2,
  50 #define ERR_GDT         0
  51 #define ERR_IDT         1
  52 #define ERR_LDT         2
  53                         index   :13,
  54                                 :16;
  55     } normal;
  56     struct err_code_pgfault {
  57         unsigned int    prot    :1,
  58                         wrtflt  :1,
  59                         user    :1,
  60                                 :29;
  61     } pgfault;
  62 } err_code_t;
  63
  64 #include <architecture/i386/sel.h>
  65
  66 /*
  67  * The actual hardware exception frame
  68  * is variable in size.  An error code is
  69  * only pushed for certain exceptions.
  70  * Previous stack information is only
  71  * pushed for exceptions that cause a
  72  * change in privilege level.  The dpl
  73  * field of the saved CS selector can be
  74  * used to determine whether this is the
  75  * case.  If the interrupted task was
  76  * executing in v86 mode, then the data
  77  * segment registers are also present in
  78  * the exception frame (in addition to
  79  * previous stack information).  This
  80  * case can be determined by examining
  81  * eflags.
  82  */
  83
  84 typedef struct except_frame {
  85     err_code_t          err;
  86     unsigned int        eip;
  87     sel_t               cs;
  88     unsigned int                :0;
  89     unsigned int        eflags;
  90     unsigned int        esp;
  91     sel_t               ss;
  92     unsigned int                :0;
  93     unsigned short      v_es;
  94     unsigned int                :0;
  95     unsigned short      v_ds;
  96     unsigned int                :0;
  97     unsigned short      v_fs;
  98     unsigned int                :0;
  99     unsigned short      v_gs;
 100     unsigned int                :0;
 101 } except_frame_t;
 102
 103 /*
 104  * Values in eflags.
 105  */
 106
 107 #ifndef EFL_CF  /* FIXME */
 108 #define EFL_CF          0x00001
 109 #define EFL_PF          0x00004
 110 #define EFL_AF          0x00010
 111 #define EFL_ZF          0x00040
 112 #define EFL_SF          0x00080
 113 #define EFL_TF          0x00100
 114 #define EFL_IF          0x00200
 115 #define EFL_DF          0x00400
 116 #define EFL_OF          0x00800
 117 #define EFL_IOPL        0x03000
 118 #define EFL_NT          0x04000
 119 #define EFL_RF          0x10000
 120 #define EFL_VM          0x20000
 121 #define EFL_AC          0x40000
 122 #endif
 123
 124 #define EFL_CLR         0xfff88028
 125 #define EFL_SET         0x00000002