summaryrefslogtreecommitdiff
path: root/sos-code-article3/hwcore/exception_wrappers.S
blob: 2f7665c4160b0ce5b15d49a39f976818ffc062d8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/* Copyright (C) 2004  The KOS Team
   Copyright (C) 1999  Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. 
*/
#include "exception.h"
         
.file "exception_wrappers.S"

.text

/* The address of the table of handlers (defined in exception.c) */
.extern sos_exception_handler_array

/* The address of the table of wrappers (defined below, and shared
   with exception.c */
.globl sos_exception_wrapper_array

	
/**
 * For exceptions with/without error code, refer to Intel x86 doc vol 3,
 * section 5.12
 */

/* These wrappers are for exceptions without error code */
.irp id,                              \
         SOS_EXCEPT_DIVIDE_ERROR,                \
         SOS_EXCEPT_DEBUG,                       \
         SOS_EXCEPT_NMI_INTERRUPT,               \
         SOS_EXCEPT_BREAKPOINT,                  \
         SOS_EXCEPT_OVERFLOW,                    \
         SOS_EXCEPT_BOUND_RANGE_EXCEDEED,        \
         SOS_EXCEPT_INVALID_OPCODE,              \
         SOS_EXCEPT_DEVICE_NOT_AVAILABLE,        \
         SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN, \
         SOS_EXCEPT_INTEL_RESERVED_1,            \
         SOS_EXCEPT_FLOATING_POINT_ERROR,        \
         SOS_EXCEPT_MACHINE_CHECK,               \
         SOS_EXCEPT_INTEL_RESERVED_2,            \
         SOS_EXCEPT_INTEL_RESERVED_3,            \
         SOS_EXCEPT_INTEL_RESERVED_4,            \
         SOS_EXCEPT_INTEL_RESERVED_5,            \
         SOS_EXCEPT_INTEL_RESERVED_6,            \
         SOS_EXCEPT_INTEL_RESERVED_7,            \
         SOS_EXCEPT_INTEL_RESERVED_8,            \
         SOS_EXCEPT_INTEL_RESERVED_9,            \
         SOS_EXCEPT_INTEL_RESERVED_10,           \
         SOS_EXCEPT_INTEL_RESERVED_11,           \
         SOS_EXCEPT_INTEL_RESERVED_12,           \
         SOS_EXCEPT_INTEL_RESERVED_13,           \
         SOS_EXCEPT_INTEL_RESERVED_14
 
        .p2align 2, 0x90
        sos_exception_wrapper_\id:
        .type sos_exception_wrapper_\id,@function
 
                /* Fake error code */
                pushl $0
                /* Backup the context */
                pushl %ebp
                movl %esp, %ebp
 
                pushl %edi
                pushl %esi
                pushl %edx
                pushl %ecx
                pushl %ebx
                pushl %eax
                subl  $2,%esp
                pushw %ss
                pushw %ds
                pushw %es
                pushw %fs
                pushw %gs
 
                /* Call the handler with exception number as
                 * argument */
                pushl $\id
                leal  sos_exception_handler_array,%edi
                call  *\id*4(%edi)
                addl  $4, %esp

                /* Restore the context */
                popw  %gs
                popw  %fs
                popw  %es
                popw  %ds
                popw  %ss
                addl  $2,%esp
                popl  %eax
                popl  %ebx
                popl  %ecx
                popl  %edx
                popl  %esi
                popl  %edi
 
                popl  %ebp
                /* Remove fake error code */
                addl $4, %esp
                iret
.endr 
 
        /* These wrappers are for exceptions with error code */
.irp id,                              \
	SOS_EXCEPT_INVALID_TSS,                  \
	SOS_EXCEPT_SEGMENT_NOT_PRESENT,          \
	SOS_EXCEPT_STACK_SEGMENT_FAULT,          \
	SOS_EXCEPT_GENERAL_PROTECTION,           \
	SOS_EXCEPT_PAGE_FAULT,                   \
	SOS_EXCEPT_ALIGNEMENT_CHECK
 
        .p2align 2, 0x90
        sos_exception_wrapper_\id:
        .type sos_exception_wrapper_\id,@function
 
                /* ret eflags */
                /* ret cs */
                /* ret eip */
                /* Error code */
 
                /* Backup the context */
                pushl %ebp
                movl %esp, %ebp
 
                pushl %edi
                pushl %esi
                pushl %edx
                pushl %ecx
                pushl %ebx
                pushl %eax
                subl  $2,%esp
                pushw %ss
                pushw %ds
                pushw %es
                pushw %fs
                pushw %gs

                /* Call the handler with exception number as
                 * argument */
                pushl $\id
                leal  sos_exception_handler_array,%edi
                call  *\id*4(%edi)
                addl  $4, %esp

                /* Restore the context */
                popw  %gs
                popw  %fs
                popw  %es
                popw  %ds
                popw  %ss
                addl  $2,%esp
                popl  %eax
                popl  %ebx
                popl  %ecx
                popl  %edx
                popl  %esi
                popl  %edi
                popl  %ebp
 
                /* Error code isn't compatible with iretd */
                addl $4, %esp
 
                iret
.endr


/* Double fault handler not supported. We must define it since we
   define an entry for it in the sos_exception_wrapper_array. */
.irp id, SOS_EXCEPT_DOUBLE_FAULT
.p2align 2, 0x90
sos_exception_wrapper_\id:
.type sos_exception_wrapper_\id,@function
1:	hlt
	jmp 1b /* Machine halting */
.endr

/* Build the sos_irq_wrapper_array, shared with interrupt.c */
.section ".rodata"
.p2align 5, 0x0
sos_exception_wrapper_array:
	.irp id, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, \
	         16,17,18,19,20,21,22,23,24,25,26,27,29,30,31
	  .long (sos_exception_wrapper_\id)
	.endr