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001 /* Copyright (C) 2004 The KOS Team 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any later version. 008 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details. 013 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 018 */ 019 #include "exception.h" 020 021 .file "exception_wrappers.S" 022 023 .text 024 025 /* The address of the table of handlers (defined in exception.c) */ 026 .extern sos_exception_handler_array 027 028 /* The address of the table of wrappers (defined below, and shared 029 with exception.c */ 030 .globl sos_exception_wrapper_array 031 032 033 /** 034 * For exceptions with/without error code, refer to Intel x86 doc vol 3, 035 * section 5.12 036 */ 037 038 /* These wrappers are for exceptions without error code */ 039 .irp id, \ 040 SOS_EXCEPT_DIVIDE_ERROR, \ 041 SOS_EXCEPT_DEBUG, \ 042 SOS_EXCEPT_NMI_INTERRUPT, \ 043 SOS_EXCEPT_BREAKPOINT, \ 044 SOS_EXCEPT_OVERFLOW, \ 045 SOS_EXCEPT_BOUND_RANGE_EXCEDEED, \ 046 SOS_EXCEPT_INVALID_OPCODE, \ 047 SOS_EXCEPT_DEVICE_NOT_AVAILABLE, \ 048 SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN, \ 049 SOS_EXCEPT_INTEL_RESERVED_1, \ 050 SOS_EXCEPT_FLOATING_POINT_ERROR, \ 051 SOS_EXCEPT_MACHINE_CHECK, \ 052 SOS_EXCEPT_INTEL_RESERVED_2, \ 053 SOS_EXCEPT_INTEL_RESERVED_3, \ 054 SOS_EXCEPT_INTEL_RESERVED_4, \ 055 SOS_EXCEPT_INTEL_RESERVED_5, \ 056 SOS_EXCEPT_INTEL_RESERVED_6, \ 057 SOS_EXCEPT_INTEL_RESERVED_7, \ 058 SOS_EXCEPT_INTEL_RESERVED_8, \ 059 SOS_EXCEPT_INTEL_RESERVED_9, \ 060 SOS_EXCEPT_INTEL_RESERVED_10, \ 061 SOS_EXCEPT_INTEL_RESERVED_11, \ 062 SOS_EXCEPT_INTEL_RESERVED_12, \ 063 SOS_EXCEPT_INTEL_RESERVED_13, \ 064 SOS_EXCEPT_INTEL_RESERVED_14 065 066 .p2align 2, 0x90 067 sos_exception_wrapper_\id: 068 .type sos_exception_wrapper_\id,@function 069 070 /* Fake error code */ 071 pushl $0 072 /* Backup the context */ 073 pushl %ebp 074 movl %esp, %ebp 075 076 pushl %edi 077 pushl %esi 078 pushl %edx 079 pushl %ecx 080 pushl %ebx 081 pushl %eax 082 subl $2,%esp 083 pushw %ss 084 pushw %ds 085 pushw %es 086 pushw %fs 087 pushw %gs 088 089 /* 090 * Call the handler with the exception number and the 091 * address of the stored CPU context as arguments 092 */ 093 pushl %esp 094 pushl $\id 095 leal sos_exception_handler_array,%edi 096 call *\id*4(%edi) 097 /* Unallocate the arguments passed to the handler */ 098 addl $8, %esp 099 100 /* Restore the context */ 101 popw %gs 102 popw %fs 103 popw %es 104 popw %ds 105 popw %ss 106 addl $2,%esp 107 popl %eax 108 popl %ebx 109 popl %ecx 110 popl %edx 111 popl %esi 112 popl %edi 113 114 popl %ebp 115 /* Remove fake error code */ 116 addl $4, %esp 117 iret 118 .endr 119 120 /* These wrappers are for exceptions with error code */ 121 .irp id, \ 122 SOS_EXCEPT_INVALID_TSS, \ 123 SOS_EXCEPT_SEGMENT_NOT_PRESENT, \ 124 SOS_EXCEPT_STACK_SEGMENT_FAULT, \ 125 SOS_EXCEPT_GENERAL_PROTECTION, \ 126 SOS_EXCEPT_PAGE_FAULT, \ 127 SOS_EXCEPT_ALIGNEMENT_CHECK 128 129 .p2align 2, 0x90 130 sos_exception_wrapper_\id: 131 .type sos_exception_wrapper_\id,@function 132 133 /* ret eflags */ 134 /* ret cs */ 135 /* ret eip */ 136 /* Error code */ 137 138 /* Backup the context */ 139 pushl %ebp 140 movl %esp, %ebp 141 142 pushl %edi 143 pushl %esi 144 pushl %edx 145 pushl %ecx 146 pushl %ebx 147 pushl %eax 148 subl $2,%esp 149 pushw %ss 150 pushw %ds 151 pushw %es 152 pushw %fs 153 pushw %gs 154 155 /* 156 * Call the handler with the exception number and the 157 * address of the stored CPU context as arguments 158 */ 159 pushl %esp 160 pushl $\id 161 leal sos_exception_handler_array,%edi 162 call *\id*4(%edi) 163 /* Unallocate the arguments passed to the handler */ 164 addl $8, %esp 165 166 /* Restore the context */ 167 popw %gs 168 popw %fs 169 popw %es 170 popw %ds 171 popw %ss 172 addl $2,%esp 173 popl %eax 174 popl %ebx 175 popl %ecx 176 popl %edx 177 popl %esi 178 popl %edi 179 popl %ebp 180 181 /* Error code isn't compatible with iretd */ 182 addl $4, %esp 183 184 iret 185 .endr 186 187 188 /* Double fault handler not supported. We must define it since we 189 define an entry for it in the sos_exception_wrapper_array. It 190 simply uses an alternate stack to display a message and stop the 191 system. qemu won't handle it correctly (see comment in qemu's 192 sources). */ 193 #define ALTERNATE_DOUBLE_FAULT_STACK_SIZE 512 194 .irp id, SOS_EXCEPT_DOUBLE_FAULT 195 .p2align 2, 0x90 196 sos_exception_wrapper_\id: 197 .type sos_exception_wrapper_\id,@function 198 1: cli /* Not necessary */ 199 movl $double_fault_alternate_stack, %eax 200 addl $ALTERNATE_DOUBLE_FAULT_STACK_SIZE, %eax 201 movl %eax, %esp 202 pushl $msg_double_fault_not_supported 203 call sos_display_fatal_error ; jmp 1b /* Not necessary */ 204 .endr 205 206 .section ".rodata" 207 msg_double_fault_not_supported: 208 .string "exception_wrappers.S: Double fault detected ! NOT SUPPORTED yet. System Halted." 209 210 /* Build the sos_irq_wrapper_array, shared with interrupt.c */ 211 .p2align 5, 0x0 212 sos_exception_wrapper_array: 213 .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, \ 214 16,17,18,19,20,21,22,23,24,25,26,27,29,30,31 215 .long (sos_exception_wrapper_\id) 216 .endr 217 218 /* Alternate stack for double fault handler */ 219 .bss 220 .p2align 2, 0x0 221 .size double_fault_alternate_stack, ALTERNATE_DOUBLE_FAULT_STACK_SIZE 222 double_fault_alternate_stack: 223 .fill ALTERNATE_DOUBLE_FAULT_STACK_SIZE, 1, 0x0
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