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.\" Title: yasm_objfmts
.\" Author: Peter Johnson <>
.\" Generator: DocBook XSL Stylesheets v1.76.1 <>
.\" Date: February 2007
.\" Manual: Yasm Supported Object Formats
.\" Source: Yasm
.\" Language: English
.TH "YASM_OBJFMTS" "7" "February 2007" "Yasm" "Yasm Supported Object Formats"
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yasm_objfmts \- Yasm Supported Object Formats
.HP \w'\fByasm\fR\ 'u
\fByasm\fR \fB\-f\ \fR\fB\fIobjfmt\fR\fR \fB\fI\&.\&.\&.\fR\fR
The standard Yasm distribution includes a number of modules for different object formats (Yasm\*(Aqs primary output)\&.
The object format is selected on the
command line by use of the
\fB\-f \fR\fB\fIobjfmt\fR\fR
command line option\&.
object format produces a flat\-format, non\-relocatable binary file\&. It is appropriate for producing DOS \&.COM executables or things like boot blocks\&. It supports only 3 sections and those sections are written in a predefined order to the output file\&.
The COFF object format is an older relocatable object format used on older Unix and compatible systems, and also (more recently) on the DJGPP development system for DOS\&.
object format is not a
object format; the output file it creates simply describes the sequence of calls made to it by Yasm and the final object and symbol table information in a human\-readable text format (that in a normal object format would get processed into that object format\*(Aqs particular binary representation)\&. This object format is not intended for real use, but rather for debugging Yasm\*(Aqs internals\&.
The ELF object format really comes in three flavors:
(for 32\-bit targets),
(for 64\-bit targets and
(for x32 targets)\&. ELF is a standard object format in common use on modern Unix and compatible systems (e\&.g\&. Linux, FreeBSD)\&. ELF has complex support for relocatable and shared objects\&.
The Mach\-O object format really comes in two flavors:
(for 32\-bit targets) and
(for 64\-bit targets)\&. Mach\-O is used as the object format on MacOS X\&. As Yasm currently only supports x86 and AMD64 instruction sets, it can only generate Mach\-O objects for Intel\-based Macs\&.
The RDOFF2 object format is a simple multi\-section format originally designed for NASM\&. It supports segment references but not WRT references\&. It was designed primarily for simplicity and has minimalistic headers for ease of loading and linking\&. A complete toolchain (linker, librarian, and loader) is distributed with NASM\&.
.SH "WIN32"
The Win32 object format produces object files compatible with Microsoft compilers (such as Visual C++) that target the 32\-bit x86 Windows platform\&. The object format itself is an extended version of COFF\&.
.SH "WIN64"
The Win64 object format produces object files compatible with Microsoft compilers that target the 64\-bit
Windows platform\&. This format is very similar to the win32 object format, but produces 64\-bit objects\&.
The XDF object format is essentially a simplified version of COFF\&. It\*(Aqs a multi\-section relocatable format that supports 64\-bit physical and virtual addresses\&.
\fBPeter Johnson\fR <\&peter@tortall\&.net\&>
.RS 4
Copyright \(co 2006 Peter Johnson