What do I have to change from 32 bits to 64?

[xassiz]

Hello, I'm new in ASM.

A friend recommended me MASM and JWasm with GoLinker.

I use Windows 7 64 bits.

I made correctly the Win64_2.asm from JWasm\Samples, but I started learning with a tutorial and it teaches but for 32 bits.

My code is:

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.MODEL SMALL
.CODE
Mycode:
MOV AX,@DATA
MOV DS,AX
MOV DX,Offset Texto
MOV AH,4C00H
INT 21H
.DATA
Texto DB "yehehe$"
.STACK
END Mycode

What do I have to change for 64 bits?

Thanks!

PD: Sorry by my english, I'm from spain ::)

PD2: I think is because the bits, the error was:

yehe.asm(7) : Error A2050: Operands must be the same size: 1 - 2
yehe.asm: 12 lines, 1 passes, 15 ms, 0 warnings, 1 errors

[qWord]

your code is 16Bit DOS code.
My suggestion is to start with 32Bit Assembler using masm32 package - it's an all in one solution and there is a lot of code available. As long as you have programming skills with some other programming language (e.g. c/c++) it shouldn't be a problem to step in.

qWord

[dedndave]

qWord is right

but the error is here

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MOV AH,4C00H

you are trying to MOV a word value into a byte register
replace that line with

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MOV AX,4C00H

also - if you want to see the results...

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MOV DX,Offset Texto
MOV AH,9
INT 21H
MOV AX,4C00H
INT 21H

[xassiz]

your code is 16Bit DOS code.
My suggestion is to start with 32Bit Assembler using masm32 package - it's an all in one solution and there is a lot of code available. As long as you have programming skills with some other programming language (e.g. c/c++) it shouldn't be a problem to step in.

qWord

I program in C/C++, Perl, Python, PHP, Bash/Batch.. but I would like try something new, and ASM can teach me a lot of things.

My friend recommended me JWasm because MASM32 isn't free, and GoLink because he wasn't sure that the Jwasm's linker runs in x86.

but the error is here

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MOV AH,4C00H

you are trying to MOV a word value into a byte register
replace that line with

Code Select Expand

MOV AX,4C00H

I changed that, and runs like 32 bits:

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jwasm code.asm
It makes code.obj, but I do:

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GoLink code.obj
and the output is:

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Error!
A source file is in OMF format which is not supported (code.obj)
Output file not made


I try like 64 bits:

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jwasm -win64 code.asm
and..

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code.asm(1) : Warning A4097: Multiple .MODEL directives, .MODEL ignored
code.asm(6) : Error A2050: Operands must be the same size: 2 - 8
code.asm: 12 lines, 2 passes, 0 ms, 1 warnings, 1 errors


And another doubt, over x64 I'll can run 32 bits codes correctly with the sofware I have?


Thanks!

[qWord]

build this as console app:

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option casemap:none
option frame:auto ; see documentation

includelib kernel32.lib
includelib msvcrt.lib

;UNICODE EQU 1 ; lets use unicode
_WIN64 EQU 1
include Windows.inc ; japheth's wininc - http://www.japheth.de/

;/* define some CRT functions */
printf proto :ptr BYTE,:VARARG
_getch proto

.code
main proc

.data
sz db "Hello World",0
.code

invoke printf,ADDR sz
invoke _getch

invoke ExitProcess,0

main endp
end main

[xassiz]

Arg, error again, I need Windows.inc

[dedndave]

install the masm32 package
masm is free, but you can't use it to write code for non-windows OS's
JwAsm is unrestricted - you may use it however you like
but - masm is still a good place to get your feet wet

[qWord]

Arg, error again, I need Windows.inc

; japheth's wininc - http://www.japheth.de/

[xassiz]

Arg, error again, I need Windows.inc

; japheth's wininc - http://www.japheth.de/

Yeah, I downloaded it but I can't install the libraries....

I'll try with MASM32

[qWord]

you must download and install the windows SDK - it contains the needed libraries. MASM32 supplies only 32Bit libraries, that wont work for 64Bit.

[xassiz]

you must download and install the windows SDK - it contains the needed libraries. MASM32 supplies only 32Bit libraries, that wont work for 64Bit.

Ok thanks, I have just downloaded the windows SDK libraries.. but now, how can I assemble?

test.asm(9) : Error A2089: Cannot open include file 'Windows.inc'
test.asm(25) : Error A2161: INVOKE requires prototype for procedure
test.asm: 28 lines, 1 passes, 0 ms, 0 warnings, 2 errors

[japheth]

Ok thanks, I have just downloaded the windows SDK libraries.. but now, how can I assemble?

The fact that you tried to assemble 16-bit DOS code as a 64-bit Windows application tells me that you are not ready to play with 64-bit assembly.

The best hint I can give is: try 32-bit Windows first - and read the docs!

[xassiz]

Ok thanks, I have just downloaded the windows SDK libraries.. but now, how can I assemble?

The best hint I can give is: try 32-bit Windows first - and read the docs!

You say that I program for 32-bit or over 32-bit windows?

[qWord]

I program in C/C++

how long are you programming? - your previous posts let me assume, that you are an greenhorn ... in this case assembler it is not a good choice.

[xassiz]

I program in C/C++

how long are you programming? - your previous posts let me assume, that you are an greenhorn ... in this case assembler it is not a good choice.

2 years in C >.<

I want ASM, I'm a "greenhorn" in ASM :dazzled: