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