The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  The KOS Team
002    Copyright (C) 1999  Free Software Foundation, Inc.
003 
004    This program is free software; you can redistribute it and/or
005    modify it under the terms of the GNU General Public License
006    as published by the Free Software Foundation; either version 2
007    of the License, or (at your option) any later version.
008    
009    This program is distributed in the hope that it will be useful,
010    but WITHOUT ANY WARRANTY; without even the implied warranty of
011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012    GNU General Public License for more details.
013    
014    You should have received a copy of the GNU General Public License
015    along with this program; if not, write to the Free Software
016    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
017    USA. 
018 */
019 #include "exception.h"
020          
021 .file "exception_wrappers.S"
022 
023 .text
024 
025 /* The address of the table of handlers (defined in exception.c) */
026 .extern sos_exception_handler_array
027 
028 /* The address of the table of wrappers (defined below, and shared
029    with exception.c */
030 .globl sos_exception_wrapper_array
031 
032         
033 /**
034  * For exceptions with/without error code, refer to Intel x86 doc vol 3,
035  * section 5.12
036  */
037 
038 /* These wrappers are for exceptions without error code */
039 .irp id,                              \
040          SOS_EXCEPT_DIVIDE_ERROR,                \
041          SOS_EXCEPT_DEBUG,                       \
042          SOS_EXCEPT_NMI_INTERRUPT,               \
043          SOS_EXCEPT_BREAKPOINT,                  \
044          SOS_EXCEPT_OVERFLOW,                    \
045          SOS_EXCEPT_BOUND_RANGE_EXCEDEED,        \
046          SOS_EXCEPT_INVALID_OPCODE,              \
047          SOS_EXCEPT_DEVICE_NOT_AVAILABLE,        \
048          SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN, \
049          SOS_EXCEPT_INTEL_RESERVED_1,            \
050          SOS_EXCEPT_FLOATING_POINT_ERROR,        \
051          SOS_EXCEPT_MACHINE_CHECK,               \
052          SOS_EXCEPT_INTEL_RESERVED_2,            \
053          SOS_EXCEPT_INTEL_RESERVED_3,            \
054          SOS_EXCEPT_INTEL_RESERVED_4,            \
055          SOS_EXCEPT_INTEL_RESERVED_5,            \
056          SOS_EXCEPT_INTEL_RESERVED_6,            \
057          SOS_EXCEPT_INTEL_RESERVED_7,            \
058          SOS_EXCEPT_INTEL_RESERVED_8,            \
059          SOS_EXCEPT_INTEL_RESERVED_9,            \
060          SOS_EXCEPT_INTEL_RESERVED_10,           \
061          SOS_EXCEPT_INTEL_RESERVED_11,           \
062          SOS_EXCEPT_INTEL_RESERVED_12,           \
063          SOS_EXCEPT_INTEL_RESERVED_13,           \
064          SOS_EXCEPT_INTEL_RESERVED_14
065  
066         .p2align 2, 0x90
067         sos_exception_wrapper_\id:
068         .type sos_exception_wrapper_\id,@function
069  
070                 /* Fake error code */
071                 pushl $0
072                 /* Backup the context */
073                 pushl %ebp
074                 movl %esp, %ebp
075  
076                 pushl %edi
077                 pushl %esi
078                 pushl %edx
079                 pushl %ecx
080                 pushl %ebx
081                 pushl %eax
082                 subl  $2,%esp
083                 pushw %ss
084                 pushw %ds
085                 pushw %es
086                 pushw %fs
087                 pushw %gs
088  
089                 /* Call the handler with exception number as
090                  * argument */
091                 pushl $\id
092                 leal  sos_exception_handler_array,%edi
093                 call  *\id*4(%edi)
094                 addl  $4, %esp
095 
096                 /* Restore the context */
097                 popw  %gs
098                 popw  %fs
099                 popw  %es
100                 popw  %ds
101                 popw  %ss
102                 addl  $2,%esp
103                 popl  %eax
104                 popl  %ebx
105                 popl  %ecx
106                 popl  %edx
107                 popl  %esi
108                 popl  %edi
109  
110                 popl  %ebp
111                 /* Remove fake error code */
112                 addl $4, %esp
113                 iret
114 .endr 
115  
116         /* These wrappers are for exceptions with error code */
117 .irp id,                              \
118         SOS_EXCEPT_INVALID_TSS,                  \
119         SOS_EXCEPT_SEGMENT_NOT_PRESENT,          \
120         SOS_EXCEPT_STACK_SEGMENT_FAULT,          \
121         SOS_EXCEPT_GENERAL_PROTECTION,           \
122         SOS_EXCEPT_PAGE_FAULT,                   \
123         SOS_EXCEPT_ALIGNEMENT_CHECK
124  
125         .p2align 2, 0x90
126         sos_exception_wrapper_\id:
127         .type sos_exception_wrapper_\id,@function
128  
129                 /* ret eflags */
130                 /* ret cs */
131                 /* ret eip */
132                 /* Error code */
133  
134                 /* Backup the context */
135                 pushl %ebp
136                 movl %esp, %ebp
137  
138                 pushl %edi
139                 pushl %esi
140                 pushl %edx
141                 pushl %ecx
142                 pushl %ebx
143                 pushl %eax
144                 subl  $2,%esp
145                 pushw %ss
146                 pushw %ds
147                 pushw %es
148                 pushw %fs
149                 pushw %gs
150 
151                 /* Call the handler with exception number as
152                  * argument */
153                 pushl $\id
154                 leal  sos_exception_handler_array,%edi
155                 call  *\id*4(%edi)
156                 addl  $4, %esp
157 
158                 /* Restore the context */
159                 popw  %gs
160                 popw  %fs
161                 popw  %es
162                 popw  %ds
163                 popw  %ss
164                 addl  $2,%esp
165                 popl  %eax
166                 popl  %ebx
167                 popl  %ecx
168                 popl  %edx
169                 popl  %esi
170                 popl  %edi
171                 popl  %ebp
172  
173                 /* Error code isn't compatible with iretd */
174                 addl $4, %esp
175  
176                 iret
177 .endr
178 
179 
180 /* Double fault handler not supported. We must define it since we
181    define an entry for it in the sos_exception_wrapper_array. */
182 .irp id, SOS_EXCEPT_DOUBLE_FAULT
183 .p2align 2, 0x90
184 sos_exception_wrapper_\id:
185 .type sos_exception_wrapper_\id,@function
186 1:      hlt
187         jmp 1b /* Machine halting */
188 .endr
189 
190 /* Build the sos_irq_wrapper_array, shared with interrupt.c */
191 .section ".rodata"
192 .p2align 5, 0x0
193 sos_exception_wrapper_array:
194         .irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, \
195                  16,17,18,19,20,21,22,23,24,25,26,27,29,30,31
196           .long (sos_exception_wrapper_\id)
197         .endr
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