Get Original Use And Assembly Guide

The lea instruction copies an “effective address” from one place to another. Unlike mov, which copies data at the address src to the destination, lea copies the value of src itself to the destination. The syntax for the destinations is the same as mov. The difference is how it handles the src.

The callq instruction takes one operand, the address of the function being called. It pushes the return address (current value of %rip , which is the next instruction after the call) onto the stack and then jumps to the address of the function being called. CS107 Guide to x86-64 stanford.edu https://web.stanford.edu › class › archive › guide › x86-64 stanford.edu https://web.stanford.edu › class › archive › guide › x86-64

This instruction can be used to move a quadword between two MMX technology registers or between an MMX technology register and a 64-bit memory location, or to move data between two XMM registers or between an XMM register and a 64-bit memory location. MOVQ — Move Quadword felixcloutier.com https://.felixcloutier.com › x86 › movq felixcloutier.com https://.felixcloutier.com › x86 › movq

A 16-bit subset of instructions is available on the 16-bit x86 processors, which are the 8086, 8088, 80186, 80188, and 80286. These instructions are available in real mode on all x86 processors, and in 16-bit protected mode (80286 onwards), additional instructions relating to protected mode are available. x86 assembly language - Wikipedia wikipedia.org https://en.wikipedia.org › wiki › X86_assembly_language wikipedia.org https://en.wikipedia.org › wiki › X86_assembly_language

The addq a,b instruction adds the contents of a to b . Assembly addq clarification - Stack Overflow stackoverflow.com https://stackoverflow.com › questions › assembly-addq-c... stackoverflow.com https://stackoverflow.com › questions › assembly-addq-c...

Used after a CMP or SUB instruction, JLE transfers control to short- label if the first operand is less than or equal to the second . (Both operands are treated as signed numbers.) The target of the jump must be within -128 to +127 bytes of the next instruction.

The general registers AX, BX, CX, and DX are 16-bit. However, they are composed from two smaller registers. For example: AX. The high 8-bit is called AH, and the low 8-bit is called AL.