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