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
|
.intel_syntax noprefix
.section .text
.global halt
halt:
1: hlt
jmp 1b
.global set_gdt
set_gdt:
lgdt [rdi]
push rsi
lea rax, 1f
push rax
retfq
1: mov ds, rdx
mov es, rdx
mov fs, rdx
mov gs, rdx
mov ss, rdx
ltr rcx
ret
.global set_idt
set_idt:
lidt [rdi]
ret
.global disable_interrupts
disable_interrupts:
cli
ret
.global enable_interrupts
enable_interrupts:
sti
ret
.global get_cr2
get_cr2:
mov rax, cr2
ret
.global get_cr3
get_cr3:
mov rax, cr3
ret
#define DEFINE_ISRS \
ISR(0) \
ISR(1) \
ISR(2) \
ISR(3) \
ISR(4) \
ISR(5) \
ISR(6) \
ISR(7) \
ISR_E(8) \
ISR(9) \
ISR_E(10) \
ISR_E(11) \
ISR_E(12) \
ISR_E(13) \
ISR_E(14) \
ISR(15) \
ISR(16) \
ISR_E(17) \
ISR(18) \
ISR(19) \
ISR(20) \
ISR_E(21) \
ISR(22) \
ISR(23) \
ISR(24) \
ISR(25) \
ISR(26) \
ISR(27) \
ISR(28) \
ISR(29) \
ISR(30) \
ISR(31) \
ISR(32)
.extern interrupt_handler
#define ISR(n) \
isr_stub_##n: \
mov rdi, n; \
mov rsi, 0; \
call interrupt_handler; \
iretq;
#define ISR_E(n) \
isr_stub_##n: \
pop rsi; \
mov rdi, n; \
call interrupt_handler;
iretq;
DEFINE_ISRS
#undef ISR
#undef ISR_E
#define ISR(n) .quad isr_stub_##n;
#define ISR_E(n) .quad isr_stub_##n;
.section .data
.global isr_stubs
isr_stubs:
DEFINE_ISRS
#undef ISR
.section .text
.global dump_regs
dump_regs:
mov [rdi+0], rax
mov [rdi+8], rbx
mov [rdi+16], rcx
mov [rdi+24], rdx
mov [rdi+32], rsi
mov [rdi+40], rdi
mov [rdi+48], rsp
mov [rdi+56], rbp
mov [rdi+64], r8
mov [rdi+72], r9
mov [rdi+80], r10
mov [rdi+88], r11
mov [rdi+96], r12
mov [rdi+104], r13
mov [rdi+112], r14
mov [rdi+120], r15
lea rax, [rip]
mov [rdi+128], rax
pushf
pop [rdi+136]
mov rax, cr0
mov [rdi+144], rax
mov rax, cr2
mov [rdi+152], rax
mov rax, cr3
mov [rdi+160], rax
mov rax, cr4
mov [rdi+168], rax
mov rax, cr8
mov [rdi+176], rax
mov [rdi+184], cs
mov [rdi+186], ds
mov [rdi+188], ss
mov [rdi+190], es
mov [rdi+192], fs
mov [rdi+194], gs
ret
.global get_msr
get_msr:
mov ecx, edi
mov rax, 0 /* Not sure if this and the next line are needed. My assembly skills are lacking. */
mov rdx, 0
rdmsr
shl rdx, 32
or rax, rdx
ret
.global in_uint8
in_uint8:
mov dx, di
in ax, dx
ret
|