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2019年11月28日
base.h
1 #ifndef BASE_H
2 #define BASE_H
3
4 #include <stdio.h>
5
6 class Base
7 {
8 public:
9 Base(int val) : m_val(val)
10 {
11 printf("Base::Base(int val) @ 0x%08X\n", this);
12 }
13
14 virtual void say()
15 {
16 printf("void Base::say() @ 0x%08X\n", this);
17 printf("val = %d\n", GetVal());
18 }
19
20 virtual ~Base()
21 {
22 printf("Base::~Base() @ 0x%08X\n", this);
23 }
24
25 protected:
26 int GetVal() { return m_val; }
27
28 private:
29 int m_val;
30 };
31
32 #endif
child.h
1 #ifndef CHILD_H
2 #define CHILD_H
3
4 #include <stdio.h>
5 #include "base.h"
6
7 class Child : public Base
8 {
9 public:
10 Child(int val) : Base(val)
11 {
12 printf("Child::Child(int val) @ 0x%08X\n", this);
13 }
14
15 void say()
16 {
17 printf("void Child::say() @ 0x%08X\n", this);
18 printf("val = %d\n", GetVal());
19 }
20
21 ~Child()
22 {
23 printf("Child::~Child() @ 0x%08X\n", this);
24 }
25 };
26
27 #endif
28
main.cpp
1 #include "base.h"
2 #include "child.h"
3
4 static void test0();
5 static void test();
6 static void virfunc_call(Base *base);
7
8 void test0()
9 {
10 int src = 1;
11 int dst;
12
13 #ifdef WIN32
14 dst = src;
15 #else
16 asm ("mov %1, %0\n\t"
17 "add $1, %0"
18 : "=r" (dst)
19 : "r" (src));
20 #endif
21
22 printf("dst=%d\n", dst);
23 }
24
25 void test(Base *base)
26 {
27 int addr = 0;
28
29 #ifdef WIN32
30 printf("[1] addr=0x%08X base=0x%P\n", addr, base);
31 #else
32 printf("[1] addr=0x%08X base=0x%08X\n", addr, base);
33 #endif
34
35 #ifdef WIN32
36 addr = *((int *)base);
37 #else
38 asm (
39 "movl %0, %1\n\t"
40 : "=r" (addr)
41 : "r" (base)
42 );
43 #endif
44
45 #ifdef WIN32
46 printf("[2] addr=0x%08X base=0x%P\n", addr, base);
47 #else
48 printf("[2] addr=0x%08X base=0x%08X\n", addr, base);
49 #endif
50 }
51
52 static void virfunc_call(Base *base)
53 {
54 typedef void (*FUNC)();
55
56 int *pAddrBase = (int *)base;
57 int addr = *(int *)base;
58 int *pVirtualFuncBase = (int *)(*pAddrBase);
59
60 #ifdef WIN32
61 printf("\nvirfunc=0x%P\npAddrBase=0x%P\npVirtualFuncBase=0x%P\n\n", virfunc_call, pAddrBase, pVirtualFuncBase);
62 #else
63 printf("\nvirfunc=0x%08X\npAddrBase=0x%08X\npVirtualFuncBase=0x%08X\n\n", virfunc_call, pAddrBase, pVirtualFuncBase);
64 #endif
65
66 FUNC func = reinterpret_cast<FUNC>(*pVirtualFuncBase);
67
68 #ifdef WIN32
69 __asm {
70 mov ecx, base
71 }
72 #else
73 __asm__ __volatile__(
74 "movl %0, %%ecx"
75 :
76 : "r" (base)
77 :
78 );
79 #endif
80
81 func();
82 }
83
84 int main(int argc, char *argv[])
85 {
86 Base *base1 = nullptr, *base2 = nullptr;
87
88 base1 = new Base(1);
89 // base1->say();
90 virfunc_call(base1);
91 // test(base1);
92 delete base1;
93
94 base2 = new Child(2);
95 // base2->say();
96 virfunc_call(base2);
97 // test(base2);
98 delete base2;
99
100 return 0;
101 }
VC++
cl /DWIN32 main.cpp
G++
g++ -o main main.cpp
2015年1月8日
bootloader.asm
org 0x7c00
start:
jmp main_entry
stack:
times 128 db 0
tos:
db 0
main_entry:
mov ax, cs
mov ds, ax
mov ax, stack
mov ss, ax
mov sp, start
; initialize es:bx, read data to 0x0000:0x7e00
mov ax, 0x0000
mov es, ax
mov bx, 0x7c00+0x200
mov ah, 0x02 ; read function
mov al, 0x01 ; read 1 sectors
mov ch, 0x00 ;
mov cl, 0x02 ; read from 2nd section
mov dh, 0x00 ;
mov dl, 0x80 ; read from 1st hard disk
int 0x13
jc .die
; install interrupt 0x80
call 0x7e00
; call interrupt 0x80
mov ax, msg1
int 0x80
; call interrupt 0x80
mov ax, msg2
int 0x80
.die:
jmp $
print_char:
mov ah, 0x0e
int 0x10
ret
msg1: db "Loading system  ", 0x0d, 0x0a, 0
msg2: db "Hello, World!", 0x0d, 0x0a, 0
crlf: db 0x0d, 0x0a, 0
fill_zero:
times 510-($-$$) db 0
magic:
db 0x55, 0xAA
lib16.asm
org 0x7e00
install_int:
mov ax, 0
mov es, ax
mov ax, int_0x80
mov bx, 0x80*4
mov word [es:bx], ax ; ip
mov word [es:(bx+2)], 0 ; cs
ret
int_0x80:
pusha
mov si, ax
mov ah, 0x0e
mov al, [ds:si]
.loop:
cmp al, 0
je .exit
int 0x10
inc si
mov al, [ds:si]
jmp .loop
.exit:
popa
iret
fill_zero:
times 512-($-$$) db 0
結果圖：
2014年12月28日
2014年12月26日
main:
org 0x0100
jmp start
stack:
db 256 dup(0)
tos:
dw 0
start:
mov ax, cs
mov ds, ax
mov ss, ax
mov sp, tos
mov ax, end
mov bx, main
sub ax, bx
mov bx, 2
div bx
cmp dx, 0
je next_step
inc ax
next_step:
mov bx, ax
mov si, 0
mov di, 0
.0:
cmp di, 0
je .1
mov ax, 0x0000
push ax
call print_char
pop ax
.1:
mov dx, cs:[si]
mov ch, 0x04
mov cl, 0x04
.2:
mov ax, 0
rol dx, cl
mov al, dl
and al, 0x0f
add al, 0x30
cmp al, 0x3a
jl .3
add al, 0x07
.3:
push ax
call print_char
pop ax
dec ch
cmp ch, 0
jne .2
inc di
add si, 2
dec bx
cmp bx, 0
jne .0
hlt
print_char:
push bp
push ax
push bx
mov bp, sp
mov ax, [bp+8]
mov ah, 0x0e
mov bx, 0x0000
int 0x10
pop bx
pop ax
pop bp
ret
end:
dw 0
2014年12月19日
; You may customize this and other start-up templates;
; The location of this template is c:\emu8086\inc\0_com_template.txt
org 100h
start:
jmp main
stack:
db 256 dup(0)
code_len:
dw 0
; add your code here
main:
mov ax, cs
mov ds, ax
mov ss, ax
mov sp, stack+256
mov ax, end
mov bx, main
sub ax, bx
mov bx, 2
div bx
cmp dx, 0
je next_step
inc ax
next_step:
mov bx, code_len
mov [bx], ax
mov bx, main
push ax
push bx
push cs
call dump_memory
pop ax
pop bx
pop ax
hlt
dump_memory:
push bp
push ax
push bx
push cx
push dx
push ds
mov bp, sp
mov ax, [bp+14]
mov bx, [bp+16]
mov cx, [bp+18]
xor dx, dx
mov ds, ax
rotate_memory:
mov ax, ds:[bx]
push ax
call write_hex
pop ax
add bx, 2
loop rotate_memory
pop ax
mov ds, ax
pop dx
pop cx
pop bx
pop ax
pop bp
ret
write_hex:
push bp
push ax
push bx
push cx
push dx
mov bp, sp
mov bx, [bp+12]
xor ax, ax
xor cx, cx
mov ch, 4
rotate:
mov cl, 4
rol bx, cl
mov al, bl
and al, 0x0f
add al, 0x30
cmp al, 0x3a
jl printit
add al, 0x07
printit:
mov dl, al
push dx
call write_char
pop dx
dec ch
jnz rotate
mov dx, 0x0000
push dx
call write_char
pop dx
pop dx
pop cx
pop bx
pop ax
pop bp
ret
write_char:
push bp
push ax
push dx
mov bp, sp
mov ah, 0x02
mov dx, [bp+8]
int 0x21
pop dx
pop ax
pop bp
ret
end: db 0x55,0xaa
2014年12月18日
; You may customize this and other start-up templates;
; The location of this template is c:\emu8086\inc\0_com_template.txt
org 100h
jmp start
data:
dw 32 dup(0)
stack:
dw 256 dup(0)
start:
; add your code here
mov ax, cs
mov ds, ax
mov bx, data
mov ss, ax
mov sp, stack+31
push 0x0001
push 0x0002
push 0x0003
call test_proc
hlt
test_proc:
push bp
mov bp, sp
mov ax, [bp+8]
push ax
call write_char
mov ax, [bp+6]
push ax
call write_char
mov ax, [bp+4]
push ax
call write_char
pop bp
ret 6
write_char:
push bp
mov bp, sp
mov ax, [bp+4]
mov dl, al
add dl, 0x30
cmp dl, 0x3a
jl printit
add dl, 0x07
printit:
mov ah, 0x02
int 0x21
pop bp
ret 2
org 100h
; add your code here
mov ax, cs
mov ds, ax
mov ss, ax
mov ax, 0x0000
mov bx, 0x106f
mov ch, 0x04
rotate:
mov cl, 0x04
rol bx, cl
mov al, bl
and al, 0x0f
add al, 0x30
cmp al, 0x3a
jl printit
add al, 0x07
printit:
mov dl, al
mov ah, 0x02
int 0x21
dec ch
jnz rotate
ret
2014年12月17日
; You may customize this and other start-up templates;
; The location of this template is c:\emu8086\inc\0_com_template.txt
org 100h
; add your code here
mov ax, cs
mov ds, ax
mov ss, ax
mov sp, stack + 256 - 1
mov si, 0
push 0x105e
call write_bin
pop ax
call write_space2
push 0x0002
push 0x78fd
call write_num
pop ax
pop ax
call write_space2
push 0x0008
push 0x78fd
call write_num
pop ax
pop ax
call write_space2
push 0x000A
push 0x78fd
call write_num
pop ax
pop ax
call write_space2
push 0x0010
push 0x78fd
call write_num
pop ax
pop ax
ret
write_space2:
mov cx, 2
loop_write_char:
call write_space
loop loop_write_char
ret
write_space:
push 0x0000
call write_char
pop ax
ret
write_char:
push ax
push bx
push cx
push dx
mov bp, sp
mov ah, 0x0e
mov bx, ss:[bp+10] ; parameter 1
mov al, bl
mov bx, 0x000c
int 0x10
pop dx
pop cx
pop bx
pop ax
ret
write_bin:
mov bp, sp
mov ax, ss:[bp+2] ; parameter 1
mov cx, 16
s:
xor dx, dx
rcl ax, 1
adc dl, 0x30
push dx
call write_char
pop dx
loop s
ret
write_num:
mov bp, sp
mov ax, ss:[bp+2] ; parameter 1
mov bx, ss:[bp+4] ; parameter 2
mov cx, 0
loop_num_div:
mov dx, 0
div bx
push dx
inc cx
cmp ax, 0
jne loop_num_div
loop_num_disp:
pop dx
add dl, 0x30
cmp dl, 0x3A
jl disp_char
add dl, 0x07
disp_char:
push dx
call write_char
pop dx
loop loop_num_disp
ret
stack:
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dw 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
end_flag: db 0x11
org 100h
; add your code here
mov ax, cs
mov ds, ax
mov ax, 0xb800
mov es, ax
xor ax, ax
xor bx, bx
xor cx, cx
xor dx, dx
mov ax, 0x105e ;除數
mov bx, 10 ;被除數
s:
mov dx, 0 ;清空余數
div bx ;除以被除數
push dx ;把余數壓棧
inc cx ;循環次數加1
cmp ax, 0 ;商不為0繼續除
jne s
mov bx, 0
p1:
pop dx
add dl, 0x30
mov es:[bx], dl
inc bx
mov es:[bx], 0x0c
inc bx
loop p1
ret
org 100h
; add your code here
mov ax, cs
mov ds, ax
mov ax, 0xb800
mov es, ax
xor ax, ax
xor bx, bx
xor dx, dx
mov dl, 0x2f
mov al, dl
shr al, 4
add al, 0x30
cmp al, 0x3a
jl p1
add al, 0x07
p1:
mov es:[bx], al
inc bx
mov es:[bx], 0x0c
inc bx
mov al, dl
and al, 0x0f
add al, 0x30
cmp al, 0x3a
jl p2
add al, 0x07
p2:
mov es:[bx], al
inc bx
mov es:[bx], 0x0c
inc bx
ret
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