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The GNU Assembler, commonly known as gas or as, is the assembler developed by the GNU Project.It is the default back-end of GCC.It is used to assemble the GNU operating system and the Linux kernel, and various other software.
SASM (short for SimpleASM) is a free and open source cross-platform integrated development environment for the NASM, MASM, GAS and FASM assembly languages. It features syntax highlighting and includes a debugger. [1] SASM is intended to allow users to easily develop and run programs written in assembly language.
The Multics shell includes a run command to run a command in an isolated environment. [1] The DEC TOPS-10 [2] and TOPS-20 [3] Command Processor included a RUN command for running executable programs. In the BASIC programming language, RUN is used to start program execution from direct mode, or to start an overlay program from a loader program.
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]
LLVM targets many platforms, however its main focus is not machine-dependent code generation; instead a more high-level typed assembly-like intermediate representation is used. Nevertheless for the most common targets the LLVM MC (machine code) project provides an assembler both as an integrated component of the compilers and as an external tool.
In version 0.90, Simon Tatham added support for an object-file output interface, and for DOS .OBJ files for 16-bit code only. [9] NASM thus lacked a 32-bit object format. To address this lack, and as an exercise to learn the object-file interface, developer Julian Hall put together the first version of RDOFF, which was released in NASM version ...
He "felt that commands should be usable as building blocks for writing more commands, just like subroutine libraries." [14] "There was a facility that would execute a bunch of commands stored in a file; it was called runcom for "run commands", and the file began to be called "a runcom". rc in Unix is a fossil from that usage." [15] [16] per RUNCOM:
The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386: