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In computer programming, assembly language (alternatively assembler language [1] or symbolic machine code), [2] [3] [4] often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions. [5]
Machine code can easily be decoded back to its corresponding assembly language source code because assembly language forms a one-to-one mapping to machine code. [17] The assembly language decoding method is called disassembly. Machine code may be decoded back to its corresponding high-level language under two conditions: The first condition is ...
In computer programming an assembly is a runtime unit consisting of types and other resources. All types in an assembly have the same version number. Often, one assembly has only one namespace and is used by one program. But it can span over several namespaces. Also, one namespace can spread over several assemblies.
Furthermore, as referenced above, the following block of C is from the GNU Compiler and shows the inline assembly ability of C. Per the GCC documentation this is a simple copy and addition code. This code displays the interaction between a generally high level language like C and its middle/low level counter part Assembly.
x86 assembly language is a family of low-level programming languages that are used to produce object code for the x86 class of processors. These languages provide backward compatibility with CPUs dating back to the Intel 8008 microprocessor, introduced in April 1972.
0x90 is the one-byte encoding for XCHG AX,AX in 16-bit code and XCHG EAX,EAX in 32-bit code. In long mode, XCHG RAX,RAX requires two bytes, as it would begin with an REX.W prefix, making the encoding 0x48 0x90. However, 0x90 is interpreted as a NOP in long mode regardless of whether it is preceded by 0x48. [2] multi-byte NOP
The Motorola 6800 microprocessor was the first for which an undocumented assembly mnemonic HCF became widely known. The operation codes (opcodes—the portions of the machine language instructions that specify an operation to be performed) hexadecimal 9D and DD were reported and given the unofficial mnemonic HCF in a December 1977 article by Gerry Wheeler in BYTE magazine on undocumented ...
Assembly language, a programming language providing symbolic representation of machine code Assembly (programming) , a runtime unit of types and resources with the same version Assembly (CLI) , an XML wrapper around a compiled code library (the XML-wrapped-library itself is also sometimes referred to as an assembly) used for deployment ...