2 .\" Title: yasm_objfmts
3 .\" Author: Peter Johnson <peter@tortall.net>
4 .\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
5 .\" Date: February 2007
6 .\" Manual: Yasm Supported Object Formats
10 .TH "YASM_OBJFMTS" "7" "February 2007" "Yasm" "Yasm Supported Object Formats"
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31 yasm_objfmts \- Yasm Supported Object Formats
34 \fByasm\fR \fB\-f\ \fR\fB\fIobjfmt\fR\fR \fB\fI\&.\&.\&.\fR\fR
37 The standard Yasm distribution includes a number of modules for different object formats (Yasm\*(Aqs primary output)\&.
39 The object format is selected on the
41 command line by use of the
42 \fB\-f \fR\fB\fIobjfmt\fR\fR
43 command line option\&.
48 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\&.
51 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\&.
56 object format is not a
58 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\&.
61 The ELF object format really comes in three flavors:
63 (for 32\-bit targets),
65 (for 64\-bit targets and
67 (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\&.
70 The Mach\-O object format really comes in two flavors:
72 (for 32\-bit targets) and
74 (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\&.
77 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\&.
80 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\&.
83 The Win64 object format produces object files compatible with Microsoft compilers that target the 64\-bit
85 Windows platform\&. This format is very similar to the win32 object format, but produces 64\-bit objects\&.
88 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\&.
95 \fBPeter Johnson\fR <\&peter@tortall\&.net\&>
101 Copyright \(co 2006 Peter Johnson