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Showing content from https://github.com/streamich/ass-js below:

streamich/ass-js: Assembler.js — X86_64 and Ethereum

Assembler implemented in JavaScript:

• Pluggable design
• X64 and Ethereum assembler
• See supported X64 mnemonics
• Standalone, use it in browser or Node.js

Store 0xBABE in RAX register

import {X64} from 'ass-js';

const asm = X64();
asm._('mov', ['rax', 0xBABE]);

Compile to machine code

console.log(code.compile()); // <Buffer 48 c7 c0 be ba 00 00>

Show text representation

console.log(String(code));
// 000 main:
// 001   movq rax, 0x0000BABE ; 000000|000000 0x48, 0xC7, 0xC0, 0xBE, 0xBA, 0x00, 0x00 7 bytes

Use templates

const template = _ => {
    _('mov', ['rdx', 0xC001]);
    _('mov', ['rax', 0xBABE]);
};

asm.code(template);

• Plugins
  • X64
    • Getting started
    • Operands
    • Expressions
  • Ethereum
  • Data
    • d* - add binary data
    • res* - add uninitialized data
    • incbin - include binary file
  • Util
    • label - insert a label using label and lbl
    • align - align code to some factor boundary
• Reference
  • Asm
  • Expression
  • Compilation
• Examples
  • Hello world
  • cpuid

Unlicense — public domain.

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