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Computer Programming - Assembly Programming Language - Code Examples Sample Codes - Make a Assembly Program with Assembly Code Examples - Learn Assembly Programming.
Here we will be demonstrating Assembly programming using MASM as it is the Microsoft assembler and provide much flexibility when it comes to development on Windows environment over various other assemblers like NASM etc. Required Tools: MASM Reference 2 - MASM is a Microsoft assembler. WinAsm Reference 3 - WinAsm is IDE. It provides a nice.
Feb 21, 2014 The latter entails things like creating a virtual memory manager, a file system, a task scheduler, and basic I/O functionality. It is far, far beyond the capabilities of a beginner. Even writing a GUI in an existing operating system is a very challenging task in assembly. Don't be discouraged from trying to learn, though.
GUI Turbo Assembler is the perfect asset for developers who are seeking to replace Borland’s program with a more accessible one. It is a complex IDE that provides all the necessary tools needed for.

Literally speaking, you could write assembly language instructions that correspond to all the operations you would code in the higher level language. So you could write GUI applications in assembly.

Download Introduction to x64 Assembly [PDF 303KB]

Introduction

For years, PC programmers used x86 assembly to write performance-critical code. However, 32-bit PCs are being replaced with 64-bit ones, and the underlying assembly code has changed. This white paper is an introduction to x64 assembly. No prior knowledge of x86 code is needed, although it makes the transition easier.
x64 is a generic name for the 64-bit extensions to Intel's and AMD's 32-bit x86 instruction set architecture (ISA). AMD introduced the first version of x64, initially called x86-64 and later renamed AMD64. Intel named their implementation IA-32e and then EMT64. There are some slight incompatibilities between the two versions, but most code works fine on both versions; details can be found in the Intel® 64 and IA-32 Architectures Software Developer's Manuals and the AMD64 Architecture Tech Docs. We call this intersection flavor x64. Neither is to be confused with the 64-bit Intel® Itanium® architecture, which is called IA-64.
This white paper won't cover hardware details such as caches, branch prediction, and other advanced topics. Several references will be given at the end of the article for further reading in these areas.
Assembly is often used for performance-critical parts of a program, although it is difficult to outperform a good C++ compiler for most programmers. Assembly knowledge is useful for debugging code - sometimes a compiler makes incorrect assembly code and stepping through the code in a debugger helps locate the cause. Code optimizers sometimes make mistakes. Another use for assembly is interfacing with or fixing code for which you have no source code. Disassembly lets you change/fix existing executables. Assembly is necessary if you want to know how your language of choice works under the hood - why some things are slow and others are fast. Finally, assembly code knowledge is indispensable when diagnosing malware.

Architecture

When learning assembly for a given platform, the first place to start is to learn the register set.
General Architecture
Since the 64-bit registers allow access for many sizes and locations, we define a byte as 8 bits, a word as 16 bits, a double word as 32 bits, a quadword as 64 bits, and a double quadword as 128 bits. Intel stores bytes 'little endian,' meaning lower significant bytes are stored in lower memory addresses.

Figure 1 shows sixteen general purpose 64-bit registers, the first eight of which are labeled (for historical reasons) RAX, RBX, RCX, RDX, RBP, RSI, RDI, and RSP. The second eight are named R8-R15. By replacing the initial R with an E on the first eight registers, it is possible to access the lower 32 bits (EAX for RAX). Similarly, for RAX, RBX, RCX, and RDX, access to the lower 16 bits is possible by removing the initial R (AX for RAX), and the lower byte of the these by switching the X for L (AL for AX), and the higher byte of the low 16 bits using an H (AH for AX). The new registers R8 to R15 can be accessed in a similar manner like this: R8 (qword), R8D (lower dword), R8W (lowest word), R8B (lowest byte MASM style, Intel style R8L). Note there is no R8H.
There are odd limitations accessing the byte registers due to coding issues in the REX opcode prefix used for the new registers: an instruction cannot reference a legacy high byte (AH, BH, CH, DH) and one of the new byte registers at the same time (such as R11B), but it can use legacy low bytes (AL, BL, CL, DL). This is enforced by changing (AH, BH, CH, DH) to (BPL, SPL, DIL, SIL) for instructions using a REX prefix.
The 64-bit instruction pointer RIP points to the next instruction to be executed, and supports a 64-bit flat memory model. Memory address layout in current operating systems is covered later.
The stack pointer RSP points to the last item pushed onto the stack, which grows toward lower addresses. The stack is used to store return addresses for subroutines, for passing parameters in higher level languages such as C/C++, and for storing 'shadow space' covered in calling conventions.
The RFLAGS register stores flags used for results of operations and for controlling the processor. This is formed from the x86 32-bit register EFLAGS by adding a higher 32 bits which are reserved and currently unused. Table 1 lists the most useful flags. Most of the other flags are used for operating system level tasks and should always be set to the value previously read.
Table 1 - Common Flags

Symbol	Bit	Name	Set if..
CF	0	Carry	Operation generated a carry or borrow
PF	2	Parity	Last byte has even number of 1's, else 0
AF	4	Adjust	Denotes Binary Coded Decimal in-byte carry
ZF	6	Zero	Result was 0
SF	7	Sign	Most significant bit of result is 1
OF	11	Overflow	Overflow on signed operation
DF	10	Direction	Direction string instructions operate (increment or decrement)
ID	21	Identification	Changeability denotes presence of CPUID instruction

The floating point unit (FPU) contains eight registers FPR0-FPR7, status and control registers, and a few other specialized registers. FPR0-7 can each store one value of the types shown in Table 2. Floating point operations conform to IEEE 754. Note that most C/C++ compilers support the 32 and 64 bit types as float and double, but not the 80-bit one available from assembly. These registers share space with the eight 64-bit MMX registers.
Table 2 - Floating Point Types

Assembly Gui Programming Example

Data Type	Length	Precision (bits)	Decimal digits Precision	Decimal Range
Single Precision	32	24	7	1.1810^-38 to 3.4010^38
Double Precision	64	53	15	2.23 10^-308 to 1.7910^308
Extended Precision	80	64	19	3.3710^-4932 to 1.1810^4932

Binary Coded Decimal (BCD) is supported by a few 8-bit instructions, and an oddball format supported on the floating point registers gives an 80 bit, 17 digit BCD type.
The sixteen 128-bit XMM registers (eight more than x86) are covered in more detail.
Final registers include segment registers (mostly unused in x64), control registers, memory management registers, debug registers, virtualization registers, performance registers tracking all sorts of internal parameters (cache hits/misses, branch hits/misses, micro-ops executed, timing, and much more). The most notable performance opcode is RDTSC, which is used to count processor cycles for profiling small pieces of code.
Full details are available in the five-volume set 'Intel® 64 and IA-32 Architectures Software Developer's Manuals' at http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html. They are available for free download as PDF, order on CD, and often can be ordered for free as a hardcover set when listed.
SIMD Architecture
Single Instruction Multiple Data (SIMD) instructions execute a