Lab 05 - Assembly Language for x86 Processors by KIP R. IRVINE \

Topics: Direct Offset Operands and Arrays + Status Flags.
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Material Link: www.dropbox.co...
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Sample Code:
;-- Direct Offset Operands
;-- Status Flags
.386
.model flat, stdcall
.stack 4096
include Irvine32.inc
;-- Data segment to make variables
.data
myarray BYTE 10h, 12h, 13h, 15h
WordArray WORD 1000h, 1800h, 1125h, 2565h
msg1 BYTE "Before Swaping",0
DoubleArray DWORD 12345678h, 87654321h
;-- code segment starts here
.code
main proc
mov eax, DoubleArray
;mov ebx , DoubleArray+4
XCHG eax,DoubleArray+4
XCHG eax, DoubleArray
mov ecx, DoubleArray
mov edx, DoubleArray+4
Call DumpRegs
COMMENT !
mov edx, offset msg1
call writestring
mov eax,0
mov ebx,0
mov ecx,0
mov edx,0
mov ax, WordArray+2
mov bx, WordArray+4
mov WordArray+2,bx
mov WordArray+4, ax
mov cx, WordArray+2
mov dx, WordArray+4
call dumpregs
!
COMMENT !
;mov ebx, 0
;mov bl, myarray ;10h
;add bl, myarray+1 ; 10+12h
;call dumpregs
mov ah,myarray+3 ; 15h
mov al, myarray+2 ; 13h
mov bh, myarray+1 ; 12h
mov bl, myarray+0 ; 10h
mov myarray, ah
mov myarray+1 , al
mov myarray+2, bh
mov myarray+3 , bl
mov eax, 0
mov ebx, 0
mov ecx, 0
mov edx, 0
mov al,myarray
mov bl,myarray+1
mov cl,myarray+2
mov dl, myarray+3
call dumpregs
!
invoke ExitProcess,0
main endp
end main