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Differences between /hwcore/exception_wrappers.S (Article 3) and /hwcore/exception_wrappers.S (Article 7)


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  
089                 /* Call the handler with excep !! 097                 /* Set correct kernel segment descriptors' value */
090                  * argument */                 !! 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 
                                                   >> 104                 /*
                                                   >> 105                  * Call the handler with the exception number and the
                                                   >> 106                  * address of the stored CPU context as arguments
                                                   >> 107                  */
                                                   >> 108                 pushl %esp
091                 pushl $\id                        109                 pushl $\id
092                 leal  sos_exception_handler_ar    110                 leal  sos_exception_handler_array,%edi
093                 call  *\id*4(%edi)                111                 call  *\id*4(%edi)
094                 addl  $4, %esp                 !! 112                 /* Unallocate the arguments passed to the handler */
                                                   >> 113                 addl  $8, %esp
                                                   >> 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
095                                                   127 
096                 /* Restore the context */         128                 /* Restore the context */
097                 popw  %gs                         129                 popw  %gs
098                 popw  %fs                         130                 popw  %fs
099                 popw  %es                         131                 popw  %es
100                 popw  %ds                         132                 popw  %ds
101                 popw  %ss                         133                 popw  %ss
102                 addl  $2,%esp                     134                 addl  $2,%esp
103                 popl  %eax                        135                 popl  %eax
104                 popl  %ebx                        136                 popl  %ebx
105                 popl  %ecx                        137                 popl  %ecx
106                 popl  %edx                        138                 popl  %edx
107                 popl  %esi                        139                 popl  %esi
108                 popl  %edi                        140                 popl  %edi
109                                                   141  
110                 popl  %ebp                        142                 popl  %ebp
111                 /* Remove fake error code */      143                 /* Remove fake error code */
112                 addl $4, %esp                     144                 addl $4, %esp
113                 iret                              145                 iret
114 .endr                                             146 .endr 
115                                                   147  
116         /* These wrappers are for exceptions w    148         /* These wrappers are for exceptions with error code */
117 .irp id,                              \           149 .irp id,                              \
118         SOS_EXCEPT_INVALID_TSS,                   150         SOS_EXCEPT_INVALID_TSS,                  \
119         SOS_EXCEPT_SEGMENT_NOT_PRESENT,           151         SOS_EXCEPT_SEGMENT_NOT_PRESENT,          \
120         SOS_EXCEPT_STACK_SEGMENT_FAULT,           152         SOS_EXCEPT_STACK_SEGMENT_FAULT,          \
121         SOS_EXCEPT_GENERAL_PROTECTION,            153         SOS_EXCEPT_GENERAL_PROTECTION,           \
122         SOS_EXCEPT_PAGE_FAULT,                    154         SOS_EXCEPT_PAGE_FAULT,                   \
123         SOS_EXCEPT_ALIGNEMENT_CHECK               155         SOS_EXCEPT_ALIGNEMENT_CHECK
124                                                   156  
125         .p2align 2, 0x90                          157         .p2align 2, 0x90
126         sos_exception_wrapper_\id:                158         sos_exception_wrapper_\id:
127         .type sos_exception_wrapper_\id,@funct    159         .type sos_exception_wrapper_\id,@function
128                                                   160  
129                 /* ret eflags */                  161                 /* ret eflags */
130                 /* ret cs */                      162                 /* ret cs */
131                 /* ret eip */                     163                 /* ret eip */
132                 /* Error code */                  164                 /* Error code */
133                                                   165  
134                 /* Backup the context */          166                 /* Backup the context */
135                 pushl %ebp                        167                 pushl %ebp
136                 movl %esp, %ebp                   168                 movl %esp, %ebp
137                                                   169  
138                 pushl %edi                        170                 pushl %edi
139                 pushl %esi                        171                 pushl %esi
140                 pushl %edx                        172                 pushl %edx
141                 pushl %ecx                        173                 pushl %ecx
142                 pushl %ebx                        174                 pushl %ebx
143                 pushl %eax                        175                 pushl %eax
144                 subl  $2,%esp                     176                 subl  $2,%esp
145                 pushw %ss                         177                 pushw %ss
146                 pushw %ds                         178                 pushw %ds
147                 pushw %es                         179                 pushw %es
148                 pushw %fs                         180                 pushw %fs
149                 pushw %gs                         181                 pushw %gs
150                                                   182 
151                 /* Call the handler with excep !! 183                 /* Set correct kernel segment descriptors' value */
152                  * argument */                 !! 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 
                                                   >> 190                 /*
                                                   >> 191                  * Call the handler with the exception number and the
                                                   >> 192                  * address of the stored CPU context as arguments
                                                   >> 193                  */
                                                   >> 194                 pushl %esp
153                 pushl $\id                        195                 pushl $\id
154                 leal  sos_exception_handler_ar    196                 leal  sos_exception_handler_array,%edi
155                 call  *\id*4(%edi)                197                 call  *\id*4(%edi)
156                 addl  $4, %esp                 !! 198                 /* Unallocate the arguments passed to the handler */
                                                   >> 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
157                                                   213 
158                 /* Restore the context */         214                 /* Restore the context */
159                 popw  %gs                         215                 popw  %gs
160                 popw  %fs                         216                 popw  %fs
161                 popw  %es                         217                 popw  %es
162                 popw  %ds                         218                 popw  %ds
163                 popw  %ss                         219                 popw  %ss
164                 addl  $2,%esp                     220                 addl  $2,%esp
165                 popl  %eax                        221                 popl  %eax
166                 popl  %ebx                        222                 popl  %ebx
167                 popl  %ecx                        223                 popl  %ecx
168                 popl  %edx                        224                 popl  %edx
169                 popl  %esi                        225                 popl  %esi
170                 popl  %edi                        226                 popl  %edi
171                 popl  %ebp                        227                 popl  %ebp
172                                                   228  
173                 /* Error code isn't compatible    229                 /* Error code isn't compatible with iretd */
174                 addl $4, %esp                     230                 addl $4, %esp
175                                                   231  
176                 iret                              232                 iret
177 .endr                                             233 .endr
178                                                   234 
179                                                   235 
180 /* Double fault handler not supported. We must    236 /* Double fault handler not supported. We must define it since we
181    define an entry for it in the sos_exception !! 237    define an entry for it in the sos_exception_wrapper_array. It
                                                   >> 238    simply uses an alternate stack to display a message and stop the
                                                   >> 239    system. qemu won't handle it correctly (see comment in qemu's
                                                   >> 240    sources). */
                                                   >> 241 #define ALTERNATE_DOUBLE_FAULT_STACK_SIZE 512
182 .irp id, SOS_EXCEPT_DOUBLE_FAULT                  242 .irp id, SOS_EXCEPT_DOUBLE_FAULT
183 .p2align 2, 0x90                                  243 .p2align 2, 0x90
184 sos_exception_wrapper_\id:                        244 sos_exception_wrapper_\id:
185 .type sos_exception_wrapper_\id,@function         245 .type sos_exception_wrapper_\id,@function
186 1:      hlt                                    !! 246 1:      cli /* Not necessary */
187         jmp 1b /* Machine halting */           !! 247         movl $double_fault_alternate_stack, %eax
                                                   >> 248         addl $ALTERNATE_DOUBLE_FAULT_STACK_SIZE, %eax
                                                   >> 249         movl %eax, %esp
                                                   >> 250         pushl $msg_double_fault_not_supported
                                                   >> 251         call sos_display_fatal_error ; jmp 1b /* Not necessary */
188 .endr                                             252 .endr
189                                                   253 
190 /* Build the sos_irq_wrapper_array, shared wit << 
191 .section ".rodata"                                254 .section ".rodata"
                                                   >> 255 msg_double_fault_not_supported:
                                                   >> 256         .string "exception_wrappers.S: Double fault detected ! NOT SUPPORTED yet. System Halted."
                                                   >> 257 
                                                   >> 258 /* Build the sos_irq_wrapper_array, shared with interrupt.c */
192 .p2align 5, 0x0                                   259 .p2align 5, 0x0
193 sos_exception_wrapper_array:                      260 sos_exception_wrapper_array:
194         .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, \
195                  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
196           .long (sos_exception_wrapper_\id)       263           .long (sos_exception_wrapper_\id)
197         .endr                                     264         .endr
                                                   >> 265 
                                                   >> 266 /* Alternate stack for double fault handler */
                                                   >> 267 .bss
                                                   >> 268 .p2align 2, 0x0
                                                   >> 269 .size double_fault_alternate_stack, ALTERNATE_DOUBLE_FAULT_STACK_SIZE
                                                   >> 270 double_fault_alternate_stack:
                                                   >> 271         .fill ALTERNATE_DOUBLE_FAULT_STACK_SIZE, 1, 0x0
                                                      

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