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Questions tagged [masm32]

MASM32 is a software development environment (SDK) for programmers using Microsoft's Assembler (MASM) to target 32-bit Windows.

MASM32 is freely available at http://www.masm32.com/.

597 questions
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Assembly - .data, .code, and registers...?

So this morning I posted a confused question about assembly and I received some great genuine help, which I really appreciate. And now I'm starting to get into assembly and am beginning to understand how it works. Things I feel I understand alright…
Cam
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Multiple line comments in MASM assembly

Is there a way to comment multiple lines in assembly? I am using Masm32 v9.
nunos
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error LNK2001: unresolved external symbol _MessageBox

I am trying to create a helloworld program using only masm and not masm32 libs. Here is the code snippet: .386 .model flat, stdcall option casemap :none extrn MessageBox : PROC extrn ExitProcess : PROC .data HelloWorld db "Hello There!",…
Jumbo
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Confusing brackets in MASM32

I am trying to get to grips with MASM32 and am confused by the following: I thought that brackets were used for indirection so if I have the a pre-defined variable .data item dd 42 then mov ebx, item would put the contents of 'item', i.e.…
Penguino
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Difference between `bx` and `bp`?

What is the difference between bx and bp in assembly? Example here: mov bx, 1h mov bp, 1h Do they reference to the same memory? Is it the same with ss and sp?
tina nyaa
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Infected compiler, or malfunction?

I've encountered something very strange, and things just don't add up. First of all, I posted this here because I'm not sure if this has anything to do with computer virusses at all. And if it does, could you please direct me to a place to find…
Rick
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Outputting Hello World in MASM using WIN32 Functions

Contents Intro Code Assembling and Running Miscellaneous Question 1. Intro This isn't a question per se (though there is one at the bottom) but a HelloWorld app for people on StackOverflow to experiment with. When I was first trying programing…
Zimm3r
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bt assembly instruction

I have quesetion about bt assembly instruction. I have excerpted part of book to provide context. Please see last example, bt Testme, bx. Why does that copy TestMe+8? Shouldn't it copy TestMe+65? Very much thank you for help! 6.6.4.2 The Bit Test…
tina nyaa
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Detecting architecture at compile time from MASM/MASM64

How can I detect at compile time from an ASM source file if the target architecture is I386 or AMD64? I am using masm(ml.exe)/masm64(ml64.exe) to assemble file32.asm and file64.asm. It would be nice to create a single file, file.asm, which should…
botismarius
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Compile Assembly Output generated by VC++?

I have a simple hello world C program and compile it with /FA. As a consequence, the compiler also generates the corresponding assembly listing. Now I want to use masm/link to assemble an executable from the generated .asm listing. The following…
SDD
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The END directive in assembly language

I am new to assembly language and wrote this code: main PROC mov eax,10000h ; Eax=10000h add eax,40000h ; Eax=50000h sub eax,20000h ; Eax=30000h call DumpRegs exit main ENDP END main I wanted to…
user3307068
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Why is my masm32 program crashing whenever I try using interrupts?

Here's the code: .386 ;target for maximum compatibility .model small,stdcall ;model .code main: int 20h END main Result: http://img705.imageshack.us/img705/3738/resultom.png "test.exe has stopped working" - always right when it…
Cam
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masm32 linker does not create executable

I installed masm32 on my Windows XP SP3 machine. I downloaded masm32 from here: http://www.masm32.com/masmdl.htm Installed it. I added the path, C:\masm32\bin to the PATH environment variable. Now, I am trying to assemble and link an example…
Neon Flash
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FindWindow returns zero in MASM32 program even if the window exists

I'm trying to write a program in assembly and one of the first things that I need is the handle of the main window of a specific process. I've been trying to get it using FindWindow, but no luck so far; FindWindow apparently keeps returning zero.…
Bruce Wayne
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Accessing Segment Registers MASM

I'm trying to query the value located in the Process Enviornment Block, pointed to by the FS segment register. Attempting to compile code with the fs:[0] segment included results in an error (error A2108: use of register assumed to ERROR). How do…
James
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