CS-401 Computer Architecture & Assembly Language Programming

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Presentation transcript:

CS-401 Computer Architecture & Assembly Language Programming Lecture-21 Software Interrupts

Lets revise the last lecture

Assignment for the students

Interept

int n push flags IF < 0 TF < 0 push cs push ip ip < [0:4*n] cs < [0:4*n+2]

iret ip < [ss:sp] sp < sp + 2 cs < [ss:sp] flags < [ss:sp]

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . FLAGS IVT ******* . ******* . stack ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . FLAGS IVT ******* . ******* . stack ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . FLAGS IVT ******* . ******* . 0x2000 0x0108 stack ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .

int/iret Illustration 2000:0100 mov ax,0 2000:0103 mov bx,10 2000:0106 int 0x10 2000:0108 cmp ax,0 2000:010B . . . . 3000:0148 mov ax,0 3000:0150 . . . . 3000:0148 iret 3000:0148 . . . . IVT ******* . ******* . stack ******* . 0x0108 0x2000 FLAGS