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CS-401 Computer Architecture & Assembly Language Programming
Lecture-21 Software Interrupts
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Lets revise the last lecture
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Assignment for the students
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Interept
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int n push flags IF < 0 TF < 0 push cs push ip ip < [0:4*n]
cs < [0:4*n+2]
![int n push flags IF < 0 TF < 0 push cs push ip ip < [0:4*n]](http://slideplayer.com./slide/16398316/95/images/5/int+n+push+flags+IF+%3C+0+TF+%3C+0+push+cs+push+ip+ip+%3C+%5B0%3A4%2An%5D.jpg "cs < [0:4*n+2]")
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iret ip < [ss:sp] sp < sp + 2 cs < [ss:sp] flags < [ss:sp]
![iret ip < [ss:sp] sp < sp + 2 cs < [ss:sp] flags < [ss:sp]](http://slideplayer.com./slide/16398316/95/images/6/iret+ip+%3C+%5Bss%3Asp%5D+sp+%3C+sp+%2B+2+cs+%3C+%5Bss%3Asp%5D+flags+%3C+%5Bss%3Asp%5D.jpg "iret ip < [ss:sp] sp < sp + 2 cs < [ss:sp] flags < [ss:sp]")
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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: 3000:0148 iret 3000: FLAGS IVT ******* . ******* . stack ******* .
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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: 3000:0148 iret 3000: FLAGS IVT ******* . ******* . stack ******* .
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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: 3000:0148 iret 3000: FLAGS IVT ******* . ******* . 0x2000 0x0108 stack ******* .
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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: 3000:0148 iret 3000: IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .
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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: 3000:0148 iret 3000: IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .
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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: 3000:0148 iret 3000: IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .
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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: 3000:0148 iret 3000: IVT ******* . ******* . stack 0x0108 0x2000 FLAGS ******* .
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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: 3000:0148 iret 3000: IVT ******* . ******* . stack ******* . 0x0108 0x2000 FLAGS
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