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<title>Acknowledgements - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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<p>
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<a name="Acknowledgements"></a>Next: <a rel="next" accesskey="n" href="GNU-Free-Documentation-License.html#GNU-Free-Documentation-License">GNU Free Documentation License</a>,
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Previous: <a rel="previous" accesskey="p" href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<h2 class="chapter">11 Acknowledgements</h2>
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<p>If you have contributed to GAS and your name isn't listed here,
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it is not meant as a slight.  We just don't know about it.  Send mail to the
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maintainer, and we'll correct the situation.  Currently
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<!-- (January 1994), -->
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the maintainer is Ken Raeburn (email address <code>raeburn@cygnus.com</code>).
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   <p>Dean Elsner wrote the original <span class="sc">gnu</span> assembler for the VAX.<a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a>
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   <p>Jay Fenlason maintained GAS for a while, adding support for GDB-specific debug
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information and the 68k series machines, most of the preprocessing pass, and
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extensive changes in <span class="file">messages.c</span>, <span class="file">input-file.c</span>, <span class="file">write.c</span>.
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   <p>K. Richard Pixley maintained GAS for a while, adding various enhancements and
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many bug fixes, including merging support for several processors, breaking GAS
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up to handle multiple object file format back ends (including heavy rewrite,
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testing, an integration of the coff and b.out back ends), adding configuration
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including heavy testing and verification of cross assemblers and file splits
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and renaming, converted GAS to strictly ANSI C including full prototypes, added
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support for m680[34]0 and cpu32, did considerable work on i960 including a COFF
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port (including considerable amounts of reverse engineering), a SPARC opcode
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file rewrite, DECstation, rs6000, and hp300hpux host ports, updated “know”
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assertions and made them work, much other reorganization, cleanup, and lint.
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   <p>Ken Raeburn wrote the high-level BFD interface code to replace most of the code
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in format-specific I/O modules.
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   <p>The original VMS support was contributed by David L. Kashtan.  Eric Youngdale
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has done much work with it since.
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   <p>The Intel 80386 machine description was written by Eliot Dresselhaus.
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   <p>Minh Tran-Le at IntelliCorp contributed some AIX 386 support.
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   <p>The Motorola 88k machine description was contributed by Devon Bowen of Buffalo
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University and Torbjorn Granlund of the Swedish Institute of Computer Science.
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   <p>Keith Knowles at the Open Software Foundation wrote the original MIPS back end
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(<span class="file">tc-mips.c</span>, <span class="file">tc-mips.h</span>), and contributed Rose format support
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(which hasn't been merged in yet).  Ralph Campbell worked with the MIPS code to
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support a.out format.
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   <p>Support for the Zilog Z8k and Renesas H8/300 processors (tc-z8k,
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tc-h8300), and IEEE 695 object file format (obj-ieee), was written by
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Steve Chamberlain of Cygnus Support.  Steve also modified the COFF back end to
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use BFD for some low-level operations, for use with the H8/300 and AMD 29k
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targets.
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   <p>John Gilmore built the AMD 29000 support, added <code>.include</code> support, and
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simplified the configuration of which versions accept which directives.  He
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updated the 68k machine description so that Motorola's opcodes always produced
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fixed-size instructions (e.g., <code>jsr</code>), while synthetic instructions
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remained shrinkable (<code>jbsr</code>).  John fixed many bugs, including true tested
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cross-compilation support, and one bug in relaxation that took a week and
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required the proverbial one-bit fix.
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   <p>Ian Lance Taylor of Cygnus Support merged the Motorola and MIT syntax for the
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68k, completed support for some COFF targets (68k, i386 SVR3, and SCO Unix),
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added support for MIPS ECOFF and ELF targets, wrote the initial RS/6000 and
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PowerPC assembler, and made a few other minor patches.
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   <p>Steve Chamberlain made GAS able to generate listings.
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   <p>Hewlett-Packard contributed support for the HP9000/300.
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   <p>Jeff Law wrote GAS and BFD support for the native HPPA object format (SOM)
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along with a fairly extensive HPPA testsuite (for both SOM and ELF object
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formats).  This work was supported by both the Center for Software Science at
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the University of Utah and Cygnus Support.
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   <p>Support for ELF format files has been worked on by Mark Eichin of Cygnus
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Support (original, incomplete implementation for SPARC), Pete Hoogenboom and
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Jeff Law at the University of Utah (HPPA mainly), Michael Meissner of the Open
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Software Foundation (i386 mainly), and Ken Raeburn of Cygnus Support (sparc,
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and some initial 64-bit support).
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   <p>Linas Vepstas added GAS support for the ESA/390 “IBM 370” architecture.
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   <p>Richard Henderson rewrote the Alpha assembler. Klaus Kaempf wrote GAS and BFD
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support for openVMS/Alpha.
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   <p>Timothy Wall, Michael Hayes, and Greg Smart contributed to the various tic*
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flavors.
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   <p>David Heine, Sterling Augustine, Bob Wilson and John Ruttenberg from Tensilica,
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Inc. added support for Xtensa processors.
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   <p>Several engineers at Cygnus Support have also provided many small bug fixes and
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configuration enhancements.
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   <p>Many others have contributed large or small bugfixes and enhancements.  If
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you have contributed significant work and are not mentioned on this list, and
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want to be, let us know.  Some of the history has been lost; we are not
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intentionally leaving anyone out.
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<!-- *-texinfo-*- -->
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<div class="footnote">
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<hr>
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<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> Any
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more details?</p>
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   <p><hr></div>
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