reactos/boot/freeldr/freeldr/arch/i386/i386trap.S

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2002  Brian Palmer  <brianp@sginet.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License along
  16  *  with this program; if not, write to the Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 .intel_syntax noprefix
  21         .text
  22         .code16
  23
  24 #define ASM
  25 #include <arch.h>
  26 #include <ver.h>
  27
  28 #define SCREEN_ATTR 0x1f                        /* Bright white on blue background */
  29
  30 .macro SAVE_CPU_REGS
  31     /* push the rest of the KTRAP_FRAME */
  32     push ebp
  33     push ebx
  34     push esi
  35     push edi
  36     push fs
  37     push 0 // ExceptionList
  38     push 0 // PreviousPreviousMode
  39     push eax
  40     push ecx
  41     push edx
  42     push ds
  43     push es
  44     push gs
  45     mov eax, dr7
  46     push eax
  47     mov eax, dr6
  48     push eax
  49     mov eax, dr3
  50     push eax
  51     mov eax, dr2
  52     push eax
  53     mov eax, dr1
  54     push eax
  55     mov eax, dr0
  56     push eax
  57     sub esp, 6 * 4
  58
  59     /* push KSPECIAL_REGISTERS */
  60     /* Gdtr, Idtr, Tr, Ldtr, Reserved */
  61     sub esp, 44
  62         sgdt [esp]
  63         sidt [esp + 8]
  64         str [esp + 16]
  65         sldt [esp + 18]
  66     mov eax, dr7;
  67     push eax
  68     mov eax, dr6;
  69     push eax
  70     mov eax, dr3;
  71     push eax
  72     mov eax, dr2;
  73     push eax
  74     mov eax, dr1;
  75     push eax
  76     mov eax, dr0;
  77     push eax
  78     mov eax, cr4;
  79     push eax
  80     mov eax, cr3;
  81     push eax
  82     mov eax, cr2;
  83     push eax
  84     mov eax, cr0;
  85     push eax
  86 .endm
  87
  88 /* Set by each exception handler to the address of the description text */
  89 i386ExceptionIndex:
  90         .long   0
  91
  92
  93 /************************************************************************/
  94 i386CommonExceptionHandler:
  95         .code32
  96
  97         SAVE_CPU_REGS
  98
  99     lea eax, [esp + (21 * 4)] // KTRAP_FRAME
 100     push esp // KSPECIAL_REGISTERS
 101     push eax
 102     push i386ExceptionIndex
 103     call _i386PrintExceptionText@12
 104
 105         cli
 106 i386ExceptionHandlerHang:
 107         hlt
 108         jmp     i386ExceptionHandlerHang
 109
 110         iret
 111
 112 .macro TRAP_STUB function, index
 113     EXTERN(\function)
 114     push 0 // Fake error code
 115         mov dword ptr i386ExceptionIndex, \index
 116         jmp i386CommonExceptionHandler
 117 .endm
 118
 119 .macro TRAP_STUB2 function, index
 120     EXTERN(\function)
 121         mov dword ptr i386ExceptionIndex, \index
 122         jmp i386CommonExceptionHandler
 123 .endm
 124
 125 /************************************************************************/
 126 TRAP_STUB i386DivideByZero, 0
 127 TRAP_STUB i386DebugException, 1
 128 TRAP_STUB i386NMIException, 2
 129 TRAP_STUB i386Breakpoint, 3
 130 TRAP_STUB i386Overflow, 4
 131 TRAP_STUB i386BoundException, 5
 132 TRAP_STUB i386InvalidOpcode, 6
 133 TRAP_STUB i386FPUNotAvailable, 7
 134 TRAP_STUB2 i386DoubleFault, 8
 135 TRAP_STUB i386CoprocessorSegment, 9
 136 TRAP_STUB2 i386InvalidTSS, 10
 137 TRAP_STUB2 i386SegmentNotPresent, 11
 138 TRAP_STUB2 i386StackException, 12
 139 TRAP_STUB2 i386GeneralProtectionFault, 13
 140 TRAP_STUB2 i386PageFault, 14
 141 // 15 is reserved
 142 TRAP_STUB i386CoprocessorError, 16
 143 TRAP_STUB i386AlignmentCheck, 17
 144 TRAP_STUB i386MachineCheck, 18
 145 TRAP_STUB i386SimdFloatError, 19
 146
 147 /************************************************************************
 148  * DEBUGGING SUPPORT FUNCTIONS
 149  ************************************************************************/
 150
 151 .macro BREAKPOINT_TEPLATE functionname, mask1, mask2
 152     EXTERN(\functionname)
 153         push eax
 154         mov eax, [esp + 8]
 155         mov dr3, eax
 156         mov eax, dr7
 157         and eax, \mask1
 158         or  eax, \mask2
 159         mov dr7, eax
 160         pop eax
 161         ret
 162 .endm
 163
 164 BREAKPOINT_TEPLATE _INSTRUCTION_BREAKPOINT1, 0xfff0ffff, 0x00000303
 165 BREAKPOINT_TEPLATE _MEMORY_READWRITE_BREAKPOINT1, 0xfff0ffff, 0x00030303
 166 BREAKPOINT_TEPLATE _MEMORY_WRITE_BREAKPOINT1, 0xfff0ffff, 0x00010303
 167 BREAKPOINT_TEPLATE _INSTRUCTION_BREAKPOINT2, 0xff0fffff, 0x0000030c
 168 BREAKPOINT_TEPLATE _MEMORY_READWRITE_BREAKPOINT2, 0xff0fffff, 0x0030030c
 169 BREAKPOINT_TEPLATE _MEMORY_WRITE_BREAKPOINT2, 0xff0fffff, 0x0010030c
 170 BREAKPOINT_TEPLATE _INSTRUCTION_BREAKPOINT3, 0xf0ffffff, 0x00000330
 171 BREAKPOINT_TEPLATE _MEMORY_READWRITE_BREAKPOINT3, 0xf0ffffff, 0x03000330
 172 BREAKPOINT_TEPLATE _MEMORY_WRITE_BREAKPOINT3, 0xf0ffffff, 0x01000330
 173 BREAKPOINT_TEPLATE _INSTRUCTION_BREAKPOINT4, 0x0fffffff, 0x000003c0
 174 BREAKPOINT_TEPLATE _MEMORY_READWRITE_BREAKPOINT4, 0x0fffffff, 0x300003c0
 175 BREAKPOINT_TEPLATE _MEMORY_WRITE_BREAKPOINT4, 0x0fffffff, 0x100003c0
 176
 177