Flat assembler examples

This section contains programs created with the flat assembler and contributed by users as sample material for others to learn from. Most flat assembler examples them were submitted in the early days of this website, and they all have been designed for flat assembler 1. Nowadays new examples are contributed on the relevant forum. You may find some tutorials there as well, flat assembler examples.

Local labels, which begin with a. You can reference a local label in the context of its global label parent. It is used to determine the size of a block of code or data. The rept directive is used to compact repetitive assembly instructions into a block. The directive begins with the word rept , then a number or variable specifying the number of times the assembly instructions inside of the curly braces proceeding the instruction should be repeated. The counter variable can be aliased to be used as a symbol, or as part of an instruction within the rept block. The struc directive allows assembly of data into a format similar to that of a C structure with members.

Flat assembler examples

Home Search Register Log in to check your private messages Log in. Main index Download Documentation Examples Message board. Also on GitHub , YouTube. Website powered by rwasa. Z 5 01 Sep , by bzt Segmented Kernel. Z 0 02 Jan , by Ali. Z 2 29 Dec , by Ali. Mark all topics read. Thread Starter. Sticky: Migration from fasm to fasmg. Tomasz Grysztar.

Furthermore, since jumps in assembly can be not only backward, but also forward, we have to be able to reference labels that haven't been defined yet. This post is a part of a series on x assembly programming that I'm writing, flat assembler examples.

This post is a part of a series on x assembly programming that I'm writing. Check out part 0. In the previous part we've covered a lot of ground in a short time - from general introduction and description of how registers and memory work, to actually calling Windows API functions. In this one, I want to introduce some important features of Flat Assembler - macros, assembly-time variables and conditional assembly and a couple others. Indeed, the wise guidance is to avoid using the preprocessor as long as there's a way to achieve what you're trying to do with just language itself. The situation is quite different in assembly land. There is not much of a "language" to speak of, and there are lots of often re-occuring patterns we've seen one example - calling conventions.

It is an assembly engine designed as a successor of the one used in flat assembler 1, one of the recognized assemblers for x86 processors. This is a bare engine that by itself has no ability to recognize and encode instructions of any processor, however it has the ability to become an assembler for any CPU architecture. It has a macroinstruction language that is substantially improved compared to the one provided by flat assembler 1 and it allows to easily implement instruction encoders in form of customizable macroinstructions. The source code of this tool can be compiled with flat assembler 1, but it is also possible to use flat assembler g itself to compile it. The source contains clauses that include different header files depending on the assembler used. When flat assembler g compiles itself, it uses the provided set of headers that implement x86 instructions and formats with a syntax mostly compatible with flat assembler 1. The example programs for x86 architecture that come in this package are the selected samples that originally came with flat assembler 1 and they use sets of headers that implement instruction encoders and output formatters required to assemble them just like the original flat assembler did. To demonstrate how the instruction sets of different architectures may be implemented, there are some example programs for the microcontrollers, and AVR. They have been kept simple and therefore they do not provide a complete framework for programming such CPUs, though they may provide a solid base for the creation of such environments. There is also an example of assembling the JVM bytecode, which is a conversion of the sample originally created for flat assembler 1.

Flat assembler examples

Understanding the flat assembler. This text is of guide for advanced users, that summarizes some of the rules of the flat assembler's language and teaches select advanced techniques of combining its various features. It also has the purpose of explaining some of the behaviors that may be confusing and not conforming with the expectations unless one understands exactly how the things work and cooperate in various layers of the language used by flat assembler, which is in some aspects unique among the assemblers. This guide can not, however, replace the manual - it assumes you already have some basic knowledge about the flat assembler's language so now you can go into understanding it deeper.

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Extended Division. Sticky: Migration from fasm to fasmg. Updated Mar 14, March ; 24 years ago It has quite a few rules, and ensuring all of them are met before a function call is quite cumbersome. My old byte entry for demoscene. Written by Marcus Araujo This multipass resolving applies not only to addresses of labels, but to the values of assembly-time variables as well in fact, I'm pretty sure FASM treats labels and assembly-time variables the same way. Armed with these new tools, we can make importing and calling Windows API functions a lot less cumbersome. Now, let's turn our attention to the mysterious common directive. FASM allows us to define our own custom instructions which the manual refers to as "macroinstructions". Otherwise, the data in op2 is moved to op1 and op2 is replaced by op3. Command line parameters size: 2 kilobytes. Finally, we can use our new macro to call WinAPI functions in a more convenient way. Tutorial for Newbie.

Local labels, which begin with a.

Updated Aug 4, Assembly. Whatever algorithm is used for predicting the values of variables is "smart" enough to solve systems of simple linear equations I haven't tried more complicated ones though. Finally, we can use our new macro to call WinAPI functions in a more convenient way. INF NaN data directives extension. Add this topic to your repo To associate your repository with the flat-assembler topic, visit your repo's landing page and select "manage topics. See the documentation for details. By default, FASM lets you skip some arguments when invoking a macro. When the name of a grouparg is encountered within a common block, it is replaced by all arguments that correspond to it. NeHe Tutorial in masm If you assemble this file, and open the resulting binary, you will see that it consists of a single byte with the value 7! Retrieved Written by Marcus Araujo Calling Java classes from assembly size: 3 kilobytes. Updated Apr 12, Assembly. FASM originally ran in bit flat real mode.