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