CSC231 Homework 8 Fall 2012

--D. Thiebaut 13:14, 31 October 2012 (EDT)

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Problem 1

• Write an assembly file called hw8a.asm that will contain a series of functions (you decide how many) that help print the contents of all the registers on the screen. The main function will be called dumpRegs and when you call it, all the major registers ( eax, ebx, ecx, edx, edi and esi) will be displayed in hex on the screen, inside a nice box. Here is an example of how your function could get used in a simple hello program:

		section	.data
Hello		db	"Hello there!", 10, 10, 10
HelloLen	equ	$-Hello

		section	.text
		global	_start
_start:	

;;; print message
		mov	eax, 4		; write
		mov	ebx, 1		; stdout

                call   dumpRegs

		mov	ecx, Hello	; address of message to print
		mov	edx, HelloLen	; # of chars to print
		int 	0x80

;;; exit
		mov	ebx, 0
		mov	eax, 1
		int	0x80

The output of the program will be (something like) this:

+-------------------+
| eax = 0000 00 04 |
| ebx = 0000 00 01 |
| ecx = F503 21 11 |
| edx = 0000 12 FC |
| edi = FFFF EEC3  |
| esi = 1223 5557  |
+-------------------+
Hello there!