Difference between revisions of "CSC231 Crash Course Solution 4"
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<code><pre> | <code><pre> | ||
| + | ;;; prog4.asm | ||
| + | ;;; D. Thiebaut | ||
| + | ;;; a simple demo program to add 2 numbers | ||
| + | ;;; together, and store the sum in a 3rd variable | ||
| + | ;;; | ||
| + | ;;; Assemble, link and run as follows: | ||
| + | ;;; nasm -f elf asm_io.asm (do this only once) | ||
| + | ;;; nasm -f elf prog4.asm | ||
| + | ;;; gcc -o prog4 driver.c prog4.o asm_io.o | ||
| + | ;;; ./prog4 | ||
| + | ;;; | ||
| + | %include "asm_io.inc" | ||
| + | |||
| + | %assign SYS_EXIT 1 | ||
| + | |||
| + | ;; ------------------------- | ||
| + | ;; data segment | ||
| + | ;; ------------------------- | ||
| + | section .data | ||
| + | table dd 1, 1, 0, 0, 0 | ||
| + | |||
| + | |||
| + | ;; ------------------------- | ||
| + | ;; code area | ||
| + | ;; ------------------------- | ||
| + | section .text | ||
| + | global asm_main | ||
| + | asm_main: | ||
| + | mov esi, table ;esi points to table | ||
| + | mov eax, [esi] ;get first fib | ||
| + | add eax, [esi+4] ;add 2nd fib to eax | ||
| + | mov [esi+8], eax ;store 3rd fib in array | ||
| + | |||
| + | add esi, 8 ;make esi point to 3rd fib | ||
| + | add eax, [esi-4] ;add 2nd fib to 3rd fib | ||
| + | mov [esi+4], eax ;store 4th fib in array | ||
| + | |||
| + | add esi, 4 ;make esi point to 4th fib | ||
| + | add eax, [esi-4] ;add 3rd fib to 4th fib | ||
| + | mov [esi+4],eax ;store 5th fib in array | ||
| + | |||
| + | ;;; print the contents of the array | ||
| + | |||
| + | mov eax, [table] | ||
| + | call print_int | ||
| + | call print_nl | ||
| + | |||
| + | mov eax, [table+4] | ||
| + | call print_int | ||
| + | call print_nl | ||
| + | |||
| + | mov eax, [table+8] | ||
| + | call print_int | ||
| + | call print_nl | ||
| + | |||
| + | mov eax, [table+12] | ||
| + | call print_int | ||
| + | call print_nl | ||
| + | |||
| + | mov eax, [table+16] | ||
| + | call print_int | ||
| + | call print_nl | ||
| + | |||
| + | ;; return to C program | ||
| + | |||
| + | ret | ||
</pre></code> | </pre></code> | ||
Latest revision as of 15:11, 4 March 2011
--D. Thiebaut 15:09, 4 March 2011 (EST)
;;; prog4.asm
;;; D. Thiebaut
;;; a simple demo program to add 2 numbers
;;; together, and store the sum in a 3rd variable
;;;
;;; Assemble, link and run as follows:
;;; nasm -f elf asm_io.asm (do this only once)
;;; nasm -f elf prog4.asm
;;; gcc -o prog4 driver.c prog4.o asm_io.o
;;; ./prog4
;;;
%include "asm_io.inc"
%assign SYS_EXIT 1
;; -------------------------
;; data segment
;; -------------------------
section .data
table dd 1, 1, 0, 0, 0
;; -------------------------
;; code area
;; -------------------------
section .text
global asm_main
asm_main:
mov esi, table ;esi points to table
mov eax, [esi] ;get first fib
add eax, [esi+4] ;add 2nd fib to eax
mov [esi+8], eax ;store 3rd fib in array
add esi, 8 ;make esi point to 3rd fib
add eax, [esi-4] ;add 2nd fib to 3rd fib
mov [esi+4], eax ;store 4th fib in array
add esi, 4 ;make esi point to 4th fib
add eax, [esi-4] ;add 3rd fib to 4th fib
mov [esi+4],eax ;store 5th fib in array
;;; print the contents of the array
mov eax, [table]
call print_int
call print_nl
mov eax, [table+4]
call print_int
call print_nl
mov eax, [table+8]
call print_int
call print_nl
mov eax, [table+12]
call print_int
call print_nl
mov eax, [table+16]
call print_int
call print_nl
;; return to C program
ret
