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