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001 /* Copyright (C) 2004 The KOS Team 001 /* Copyright (C) 2004 The KOS Team 002 Copyright (C) 1999 Free Software Foundatio << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 #include "exception.h" 018 #include "exception.h" >> 019 >> 020 #include "segment.h" 020 021 021 .file "exception_wrappers.S" 022 .file "exception_wrappers.S" 022 023 023 .text 024 .text 024 025 025 /* The address of the table of handlers (defin 026 /* The address of the table of handlers (defined in exception.c) */ 026 .extern sos_exception_handler_array 027 .extern sos_exception_handler_array 027 028 028 /* The address of the table of wrappers (defin 029 /* The address of the table of wrappers (defined below, and shared 029 with exception.c */ 030 with exception.c */ 030 .globl sos_exception_wrapper_array 031 .globl sos_exception_wrapper_array 031 032 032 !! 033 /** Update the kernel TSS in case we are switching to a thread in user >> 034 mode in order to come back into the correct kernel stack */ >> 035 .extern sos_cpu_context_update_kernel_tss >> 036 >> 037 /* The address of the function to call to set back the user thread's >> 038 MMU configuration upon return to user context */ >> 039 .extern sos_thread_prepare_exception_switch_back >> 040 033 /** 041 /** 034 * For exceptions with/without error code, ref 042 * For exceptions with/without error code, refer to Intel x86 doc vol 3, 035 * section 5.12 043 * section 5.12 036 */ 044 */ 037 045 038 /* These wrappers are for exceptions without e 046 /* These wrappers are for exceptions without error code */ 039 .irp id, \ 047 .irp id, \ 040 SOS_EXCEPT_DIVIDE_ERROR, 048 SOS_EXCEPT_DIVIDE_ERROR, \ 041 SOS_EXCEPT_DEBUG, 049 SOS_EXCEPT_DEBUG, \ 042 SOS_EXCEPT_NMI_INTERRUPT, 050 SOS_EXCEPT_NMI_INTERRUPT, \ 043 SOS_EXCEPT_BREAKPOINT, 051 SOS_EXCEPT_BREAKPOINT, \ 044 SOS_EXCEPT_OVERFLOW, 052 SOS_EXCEPT_OVERFLOW, \ 045 SOS_EXCEPT_BOUND_RANGE_EXCEDEED, 053 SOS_EXCEPT_BOUND_RANGE_EXCEDEED, \ 046 SOS_EXCEPT_INVALID_OPCODE, 054 SOS_EXCEPT_INVALID_OPCODE, \ 047 SOS_EXCEPT_DEVICE_NOT_AVAILABLE, 055 SOS_EXCEPT_DEVICE_NOT_AVAILABLE, \ 048 SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRU 056 SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN, \ 049 SOS_EXCEPT_INTEL_RESERVED_1, 057 SOS_EXCEPT_INTEL_RESERVED_1, \ 050 SOS_EXCEPT_FLOATING_POINT_ERROR, 058 SOS_EXCEPT_FLOATING_POINT_ERROR, \ 051 SOS_EXCEPT_MACHINE_CHECK, 059 SOS_EXCEPT_MACHINE_CHECK, \ 052 SOS_EXCEPT_INTEL_RESERVED_2, 060 SOS_EXCEPT_INTEL_RESERVED_2, \ 053 SOS_EXCEPT_INTEL_RESERVED_3, 061 SOS_EXCEPT_INTEL_RESERVED_3, \ 054 SOS_EXCEPT_INTEL_RESERVED_4, 062 SOS_EXCEPT_INTEL_RESERVED_4, \ 055 SOS_EXCEPT_INTEL_RESERVED_5, 063 SOS_EXCEPT_INTEL_RESERVED_5, \ 056 SOS_EXCEPT_INTEL_RESERVED_6, 064 SOS_EXCEPT_INTEL_RESERVED_6, \ 057 SOS_EXCEPT_INTEL_RESERVED_7, 065 SOS_EXCEPT_INTEL_RESERVED_7, \ 058 SOS_EXCEPT_INTEL_RESERVED_8, 066 SOS_EXCEPT_INTEL_RESERVED_8, \ 059 SOS_EXCEPT_INTEL_RESERVED_9, 067 SOS_EXCEPT_INTEL_RESERVED_9, \ 060 SOS_EXCEPT_INTEL_RESERVED_10, 068 SOS_EXCEPT_INTEL_RESERVED_10, \ 061 SOS_EXCEPT_INTEL_RESERVED_11, 069 SOS_EXCEPT_INTEL_RESERVED_11, \ 062 SOS_EXCEPT_INTEL_RESERVED_12, 070 SOS_EXCEPT_INTEL_RESERVED_12, \ 063 SOS_EXCEPT_INTEL_RESERVED_13, 071 SOS_EXCEPT_INTEL_RESERVED_13, \ 064 SOS_EXCEPT_INTEL_RESERVED_14 072 SOS_EXCEPT_INTEL_RESERVED_14 065 073 066 .p2align 2, 0x90 074 .p2align 2, 0x90 067 sos_exception_wrapper_\id: 075 sos_exception_wrapper_\id: 068 .type sos_exception_wrapper_\id,@funct 076 .type sos_exception_wrapper_\id,@function 069 077 070 /* Fake error code */ 078 /* Fake error code */ 071 pushl $0 079 pushl $0 072 /* Backup the context */ 080 /* Backup the context */ 073 pushl %ebp 081 pushl %ebp 074 movl %esp, %ebp 082 movl %esp, %ebp 075 083 076 pushl %edi 084 pushl %edi 077 pushl %esi 085 pushl %esi 078 pushl %edx 086 pushl %edx 079 pushl %ecx 087 pushl %ecx 080 pushl %ebx 088 pushl %ebx 081 pushl %eax 089 pushl %eax 082 subl $2,%esp 090 subl $2,%esp 083 pushw %ss 091 pushw %ss 084 pushw %ds 092 pushw %ds 085 pushw %es 093 pushw %es 086 pushw %fs 094 pushw %fs 087 pushw %gs 095 pushw %gs 088 096 >> 097 /* Set correct kernel segment descriptors' value */ >> 098 movw $SOS_BUILD_SEGMENT_REG_VALUE(0, 0, SOS_SEG_KDATA), %di >> 099 pushw %di ; popw %ds >> 100 pushw %di ; popw %es >> 101 pushw %di ; popw %fs >> 102 pushw %di ; popw %gs >> 103 089 /* 104 /* 090 * Call the handler with the e 105 * Call the handler with the exception number and the 091 * address of the stored CPU c 106 * address of the stored CPU context as arguments 092 */ 107 */ 093 pushl %esp 108 pushl %esp 094 pushl $\id 109 pushl $\id 095 leal sos_exception_handler_ar 110 leal sos_exception_handler_array,%edi 096 call *\id*4(%edi) 111 call *\id*4(%edi) 097 /* Unallocate the arguments pa 112 /* Unallocate the arguments passed to the handler */ 098 addl $8, %esp 113 addl $8, %esp 099 114 >> 115 /* Reconfigure the MMU if needed */ >> 116 pushl %esp /* cpu_ctxt */ >> 117 call sos_thread_prepare_exception_switch_back >> 118 addl $4, %esp /* Unallocate the stack */ >> 119 >> 120 /* Prepare kernel TSS in case we are switching to a >> 121 user thread: we make sure that we will come back >> 122 into the kernel at a correct stack location */ >> 123 pushl %esp /* Pass the location of the context we are >> 124 restoring to the function */ >> 125 call sos_cpu_context_update_kernel_tss >> 126 addl $4, %esp >> 127 100 /* Restore the context */ 128 /* Restore the context */ 101 popw %gs 129 popw %gs 102 popw %fs 130 popw %fs 103 popw %es 131 popw %es 104 popw %ds 132 popw %ds 105 popw %ss 133 popw %ss 106 addl $2,%esp 134 addl $2,%esp 107 popl %eax 135 popl %eax 108 popl %ebx 136 popl %ebx 109 popl %ecx 137 popl %ecx 110 popl %edx 138 popl %edx 111 popl %esi 139 popl %esi 112 popl %edi 140 popl %edi 113 141 114 popl %ebp 142 popl %ebp 115 /* Remove fake error code */ 143 /* Remove fake error code */ 116 addl $4, %esp 144 addl $4, %esp 117 iret 145 iret 118 .endr 146 .endr 119 147 120 /* These wrappers are for exceptions w 148 /* These wrappers are for exceptions with error code */ 121 .irp id, \ 149 .irp id, \ 122 SOS_EXCEPT_INVALID_TSS, 150 SOS_EXCEPT_INVALID_TSS, \ 123 SOS_EXCEPT_SEGMENT_NOT_PRESENT, 151 SOS_EXCEPT_SEGMENT_NOT_PRESENT, \ 124 SOS_EXCEPT_STACK_SEGMENT_FAULT, 152 SOS_EXCEPT_STACK_SEGMENT_FAULT, \ 125 SOS_EXCEPT_GENERAL_PROTECTION, 153 SOS_EXCEPT_GENERAL_PROTECTION, \ 126 SOS_EXCEPT_PAGE_FAULT, 154 SOS_EXCEPT_PAGE_FAULT, \ 127 SOS_EXCEPT_ALIGNEMENT_CHECK 155 SOS_EXCEPT_ALIGNEMENT_CHECK 128 156 129 .p2align 2, 0x90 157 .p2align 2, 0x90 130 sos_exception_wrapper_\id: 158 sos_exception_wrapper_\id: 131 .type sos_exception_wrapper_\id,@funct 159 .type sos_exception_wrapper_\id,@function 132 160 133 /* ret eflags */ 161 /* ret eflags */ 134 /* ret cs */ 162 /* ret cs */ 135 /* ret eip */ 163 /* ret eip */ 136 /* Error code */ 164 /* Error code */ 137 165 138 /* Backup the context */ 166 /* Backup the context */ 139 pushl %ebp 167 pushl %ebp 140 movl %esp, %ebp 168 movl %esp, %ebp 141 169 142 pushl %edi 170 pushl %edi 143 pushl %esi 171 pushl %esi 144 pushl %edx 172 pushl %edx 145 pushl %ecx 173 pushl %ecx 146 pushl %ebx 174 pushl %ebx 147 pushl %eax 175 pushl %eax 148 subl $2,%esp 176 subl $2,%esp 149 pushw %ss 177 pushw %ss 150 pushw %ds 178 pushw %ds 151 pushw %es 179 pushw %es 152 pushw %fs 180 pushw %fs 153 pushw %gs 181 pushw %gs 154 182 >> 183 /* Set correct kernel segment descriptors' value */ >> 184 movw $SOS_BUILD_SEGMENT_REG_VALUE(0, 0, SOS_SEG_KDATA), %di >> 185 pushw %di ; popw %ds >> 186 pushw %di ; popw %es >> 187 pushw %di ; popw %fs >> 188 pushw %di ; popw %gs >> 189 155 /* 190 /* 156 * Call the handler with the e 191 * Call the handler with the exception number and the 157 * address of the stored CPU c 192 * address of the stored CPU context as arguments 158 */ 193 */ 159 pushl %esp 194 pushl %esp 160 pushl $\id 195 pushl $\id 161 leal sos_exception_handler_ar 196 leal sos_exception_handler_array,%edi 162 call *\id*4(%edi) 197 call *\id*4(%edi) 163 /* Unallocate the arguments pa 198 /* Unallocate the arguments passed to the handler */ 164 addl $8, %esp 199 addl $8, %esp >> 200 >> 201 /* Reconfigure the MMU if needed */ >> 202 pushl %esp /* cpu_ctxt */ >> 203 call sos_thread_prepare_exception_switch_back >> 204 addl $4, %esp /* Unallocate the stack */ >> 205 >> 206 /* Prepare kernel TSS in case we are switching to a >> 207 user thread: we make sure that we will come back >> 208 into the kernel at a correct stack location */ >> 209 pushl %esp /* Pass the location of the context we are >> 210 restoring to the function */ >> 211 call sos_cpu_context_update_kernel_tss >> 212 addl $4, %esp 165 213 166 /* Restore the context */ 214 /* Restore the context */ 167 popw %gs 215 popw %gs 168 popw %fs 216 popw %fs 169 popw %es 217 popw %es 170 popw %ds 218 popw %ds 171 popw %ss 219 popw %ss 172 addl $2,%esp 220 addl $2,%esp 173 popl %eax 221 popl %eax 174 popl %ebx 222 popl %ebx 175 popl %ecx 223 popl %ecx 176 popl %edx 224 popl %edx 177 popl %esi 225 popl %esi 178 popl %edi 226 popl %edi 179 popl %ebp 227 popl %ebp 180 228 181 /* Error code isn't compatible 229 /* Error code isn't compatible with iretd */ 182 addl $4, %esp 230 addl $4, %esp 183 231 184 iret 232 iret 185 .endr 233 .endr 186 234 187 235 188 /* Double fault handler not supported. We must 236 /* Double fault handler not supported. We must define it since we 189 define an entry for it in the sos_exception 237 define an entry for it in the sos_exception_wrapper_array. It 190 simply uses an alternate stack to display a 238 simply uses an alternate stack to display a message and stop the 191 system. qemu won't handle it correctly (see 239 system. qemu won't handle it correctly (see comment in qemu's 192 sources). */ 240 sources). */ 193 #define ALTERNATE_DOUBLE_FAULT_STACK_SIZE 512 241 #define ALTERNATE_DOUBLE_FAULT_STACK_SIZE 512 194 .irp id, SOS_EXCEPT_DOUBLE_FAULT 242 .irp id, SOS_EXCEPT_DOUBLE_FAULT 195 .p2align 2, 0x90 243 .p2align 2, 0x90 196 sos_exception_wrapper_\id: 244 sos_exception_wrapper_\id: 197 .type sos_exception_wrapper_\id,@function 245 .type sos_exception_wrapper_\id,@function 198 1: cli /* Not necessary */ 246 1: cli /* Not necessary */ 199 movl $double_fault_alternate_stack, %e 247 movl $double_fault_alternate_stack, %eax 200 addl $ALTERNATE_DOUBLE_FAULT_STACK_SIZ 248 addl $ALTERNATE_DOUBLE_FAULT_STACK_SIZE, %eax 201 movl %eax, %esp 249 movl %eax, %esp 202 pushl $msg_double_fault_not_supported 250 pushl $msg_double_fault_not_supported 203 call sos_display_fatal_error ; jmp 1b 251 call sos_display_fatal_error ; jmp 1b /* Not necessary */ 204 .endr 252 .endr 205 253 206 .section ".rodata" 254 .section ".rodata" 207 msg_double_fault_not_supported: 255 msg_double_fault_not_supported: 208 .string "exception_wrappers.S: Double 256 .string "exception_wrappers.S: Double fault detected ! NOT SUPPORTED yet. System Halted." 209 257 210 /* Build the sos_irq_wrapper_array, shared wit 258 /* Build the sos_irq_wrapper_array, shared with interrupt.c */ 211 .p2align 5, 0x0 259 .p2align 5, 0x0 212 sos_exception_wrapper_array: 260 sos_exception_wrapper_array: 213 .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12, 261 .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, \ 214 16,17,18,19,20,21,22,23,24,25 262 16,17,18,19,20,21,22,23,24,25,26,27,29,30,31 215 .long (sos_exception_wrapper_\id) 263 .long (sos_exception_wrapper_\id) 216 .endr 264 .endr 217 265 218 /* Alternate stack for double fault handler */ 266 /* Alternate stack for double fault handler */ 219 .bss 267 .bss 220 .p2align 2, 0x0 268 .p2align 2, 0x0 221 .size double_fault_alternate_stack, ALTERNATE_ 269 .size double_fault_alternate_stack, ALTERNATE_DOUBLE_FAULT_STACK_SIZE 222 double_fault_alternate_stack: 270 double_fault_alternate_stack: 223 .fill ALTERNATE_DOUBLE_FAULT_STACK_SIZ 271 .fill ALTERNATE_DOUBLE_FAULT_STACK_SIZE, 1, 0x0
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