1 /*
2 * linux/kernel/asm.s
3 *
4 * (C) 1991 Linus Torvalds
5 */
6
7 /*
8 * asm.s contains the low-level code for most hardware faults.
9 * page_exception is handled by the mm, so that isn't here. This
10 * file also handles (hopefully) fpu-exceptions due to TS-bit, as
11 * the fpu must be properly saved/resored. This hasn't been tested.
12 */
13
14 .globl _divide_error,_debug,_nmi,_int3,_overflow,_bounds,_invalid_op
15 .globl _double_fault,_coprocessor_segment_overrun
16 .globl _invalid_TSS,_segment_not_present,_stack_segment
17 .globl _general_protection,_coprocessor_error,_irq13,_reserved
18
19 _divide_error:
20 pushl $_do_divide_error
21 no_error_code:
22 xchgl %eax,(%esp)
23 pushl %ebx
24 pushl %ecx
25 pushl %edx
26 pushl %edi
27 pushl %esi
28 pushl %ebp
29 push %ds
30 push %es
31 push %fs
32 pushl $0 # "error code"
33 lea 44(%esp),%edx
34 pushl %edx
35 movl $0x10,%edx
36 mov %dx,%ds
37 mov %dx,%es
38 mov %dx,%fs
39 call *%eax
40 addl $8,%esp
41 pop %fs
42 pop %es
43 pop %ds
44 popl %ebp
45 popl %esi
46 popl %edi
47 popl %edx
48 popl %ecx
49 popl %ebx
50 popl %eax
51 iret
52
53 _debug:
54 pushl $_do_int3 # _do_debug
55 jmp no_error_code
56
57 _nmi:
58 pushl $_do_nmi
59 jmp no_error_code
60
61 _int3:
62 pushl $_do_int3
63 jmp no_error_code
64
65 _overflow:
66 pushl $_do_overflow
67 jmp no_error_code
68
69 _bounds:
70 pushl $_do_bounds
71 jmp no_error_code
72
73 _invalid_op:
74 pushl $_do_invalid_op
75 jmp no_error_code
76
77 _coprocessor_segment_overrun:
78 pushl $_do_coprocessor_segment_overrun
79 jmp no_error_code
80
81 _reserved:
82 pushl $_do_reserved
83 jmp no_error_code
84
85 _irq13:
86 pushl %eax
87 xorb %al,%al
88 outb %al,$0xF0
89 movb $0x20,%al
90 outb %al,$0x20
91 jmp 1f
92 1: jmp 1f
93 1: outb %al,$0xA0
94 popl %eax
95 jmp _coprocessor_error
96
97 _double_fault:
98 pushl $_do_double_fault
99 error_code:
100 xchgl %eax,4(%esp) # error code <-> %eax
101 xchgl %ebx,(%esp) # &function <-> %ebx
102 pushl %ecx
103 pushl %edx
104 pushl %edi
105 pushl %esi
106 pushl %ebp
107 push %ds
108 push %es
109 push %fs
110 pushl %eax # error code
111 lea 44(%esp),%eax # offset
112 pushl %eax
113 movl $0x10,%eax
114 mov %ax,%ds
115 mov %ax,%es
116 mov %ax,%fs
117 call *%ebx
118 addl $8,%esp
119 pop %fs
120 pop %es
121 pop %ds
122 popl %ebp
123 popl %esi
124 popl %edi
125 popl %edx
126 popl %ecx
127 popl %ebx
128 popl %eax
129 iret
130
131 _invalid_TSS:
132 pushl $_do_invalid_TSS
133 jmp error_code
134
135 _segment_not_present:
136 pushl $_do_segment_not_present
137 jmp error_code
138
139 _stack_segment:
140 pushl $_do_stack_segment
141 jmp error_code
142
143 _general_protection:
144 pushl $_do_general_protection
145 jmp error_code
146
