---
name: "fcml-asm"
section: "1"
platform: "linux"
package: "fcml"
version: "1.3.0-1.1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/fcml-asm"
---

# fcml-asm(1)

single-line assembler

## NAME

fcml-asm - single-line assembler

## SYNOPSIS

**fcml-asm** \[**-abs**\] \[**-sib**\] \[**-rex**\] \[**-all**\] \[**-gas**\] \[**-asa**\<*size*\>\] \[**-osa**\<*size*\>\] **-m**\<*size*\> **-ip** \<*address*\> \<*instruction*\>

## DESCRIPTION

**fcml-asm** is a single-line assembler for Intel *i*AP*x*86, IA-32 and EM64T CPUs, and compatible CPUs from other manufacturers.

It displays all possible encodings of the given assembly-language instruction.

## OPTIONS

**fcml-asm** accepts the following options:

- **-abs**

  Prefer absolute memory addressing where possible. This is particularly useful in 64-bit mode, for RIP addressing.

- **-sib**

  Prefer encoding using a SIB byte (scale \* index + base).

- **-rex**

  Use a REX prefix even if it is optional.

- **-all**

  Return all possible forms of the instruction.

- **-gas**

  Use GNU Assembler dialect (also known as AT&T). The Intel dialect is used by default.

- **-asa**\<*size*\>

  Specify the size of the address size attribute (16, 32 or 64 for respectively 16, 32 and 63 bits).

- **-osa**\<*size*\>

  Specify the size of the operand size attribute (16, 32 or 64 for respectively 16, 32 and 63 bits).

- **-m**\<*size*\>

  Specify the addressing mode (16, 32 or 64).

- **-ip** \<*address*\>

  Specify the instruction pointer address (IP, EIP or RIP).

## AUTHORS

**fcml-asm** was written by Slawomir Wojtasiak.

This manual page was written by Stephen Kitt \<skitt@debian.org\>, for the Debian GNU/Linux system (but may be used by others).