Difference between revisions of "CSC231 GetTimeOfDay.asm"
(New page: --~~~~ ---- <code><pre> ;;; getTimeOfDay.asm ;;; D. Thiebaut ;;; ;;; nasm -f elf getTimeOfDay.asm ;;; gcc -o getTimeOfDay driver.c asm_io.o getTimeOfDay.o ;;; %include "asm_io.inc" ...) |
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| Line 15: | Line 15: | ||
;; ------------------------- | ;; ------------------------- | ||
section .data | section .data | ||
| − | tvsec dd 0 ; number of seconds since | + | tvsec dd 0 ; number of seconds since 01/01/1970 |
tvusec dd 0 ; number of useconds | tvusec dd 0 ; number of useconds | ||
Latest revision as of 12:52, 23 November 2008
--D. Thiebaut 17:51, 23 November 2008 (UTC)
;;; getTimeOfDay.asm
;;; D. Thiebaut
;;;
;;; nasm -f elf getTimeOfDay.asm
;;; gcc -o getTimeOfDay driver.c asm_io.o getTimeOfDay.o
;;;
%include "asm_io.inc"
;; -------------------------
;; data segment
;; -------------------------
section .data
tvsec dd 0 ; number of seconds since 01/01/1970
tvusec dd 0 ; number of useconds
;; -------------------------
;; code area
;; -------------------------
section .text
global asm_main
asm_main:
;;; get the time of day in secs and print it
mov eax, 78 ; system call: get time of day
mov ebx, tvsec ; address of buffer for secs/usecs
mov ecx, 0 ; NULL for timezone
int 0x80
mov eax, [tvsec]
call print_int
call print_nl
mov eax, [tvusec]
call print_int
call print_nl
;; return to C program
ret
Here's its output
[12:49:56] ~/public_html/classes/231$: ./getTimeofDay 1227462599 278245 [12:49:59] ~/public_html/classes/231$: ./getTimeofDay 1227462600 144638 [12:50:00] ~/public_html/classes/231$: ./getTimeofDay 1227462600 753965 [12:50:00] ~/public_html/classes/231$: ./getTimeofDay 1227462601 367852 [12:50:01] ~/public_html/classes/231$: ./getTimeofDay 1227462601 938595 [12:50:01] ~/public_html/classes/231$: date Sun Nov 23 12:50:08 EST 2008
The last command gets today's date...
