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H. Peter Anvin (Intel) 3f269f2dc8 x86/insns.dat: add "UDW" as a (likely temporary) mnemonic for FF FF 
sandpile.org are referring to FF FF as "UDW" for the FF FF subcase of
FF /7. Accept that mnemonic; allow it in disassembly as well until
such time as an official mnemonic exists for this pseudo-instruction
(or the opcode ends up being actually used, which would almost
certainly be a very bad thing.)

Fixes: https://github.com/netwide-assembler/nasm/issues/249
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2026-06-26 14:29:00 -07:00
.github/workflows Setup CI/CD pipeline 2025-10-04 10:51:08 -07:00
asm directiv.c: correct the parsing of $-symbols in directives, again 2026-06-26 14:11:19 -07:00
autoconf autoconf: sync with upstream pa_option_lto.m4 2026-06-04 10:50:54 -07:00
common error: factor out error functions into separate files 2025-11-07 14:42:33 -08:00
config treewide: replace verbose copyright headers with SPDX tags 2025-10-01 11:45:31 -07:00
contrib contrib/MSVC6.txt: Add guide how to use nasm in MSVC6 2010-01-24 23:17:55 +03:00
disasm Merge remote-tracking branch 'maciej/for-hpa-fixes' 2026-02-26 15:32:29 -08:00
doc changes.src: document fixing $-escaped symbols in directives 2026-06-26 14:20:31 -07:00
editors builtin.mac: synchronize with the NASM binary 2026-06-24 15:56:50 -07:00
include limits: allow querying limits, and reset limits for each pass 2026-04-09 17:00:49 -07:00
macros Disable other warnings in endstruc 2025-10-03 10:30:33 -07:00
misc omfdump.c: add updates from Bernd Böckmann 2026-06-07 21:00:04 -07:00
Mkfiles Rename emacstok.pl back to nasmtok.pl 2026-06-21 14:34:09 -07:00
nasmlib nasmlib/numstr.c: check for buflen == 0 2026-04-07 23:09:21 -07:00
nsis nsis: remove references to RDOFF tools 2022-11-08 18:22:25 -08:00
output Proper handling of several code sections in Codeview debug information 2026-06-07 20:17:36 -07:00
perllib Fix some typos 2022-01-09 17:34:35 +01:00
stdlib nasmlib: move filename_set_extension() into path.c 2025-12-15 09:58:42 -08:00
templates Rename "headers" directory to "templates", add .h template 2025-10-15 17:34:29 -07:00
test directiv.c: $-hex requires nasm_isnumstart, not just nasm_isnumchar 2026-06-25 14:58:22 -07:00
tools x86: tools: Remove unused perl code variables 2025-10-06 19:17:51 +02:00
travis x86: fix {er} decorator placement for integer-source VCVT* instructions 2026-06-07 20:23:45 -07:00
win windows host: add embedded manifest file 2024-01-29 17:19:32 -08:00
x86 x86/insns.dat: add "UDW" as a (likely temporary) mnemonic for FF FF 2026-06-26 14:29:00 -07:00
zlib zlib: yet one more portability hack 2025-09-05 20:08:18 -07:00
.editorconfig .editorconfig: hard tabs are still 8 spaces 2024-06-10 21:12:52 -07:00
.gitattributes gitattributes: don't try to merge the version file 2020-06-30 13:48:13 -07:00
.gitignore travis: always generate a list file; show subtest number 2025-10-15 22:11:09 -07:00
.travis.yml travis: Disable osx for a while 2018-10-17 21:40:14 +03:00
AUTHORS Correct name spelling and email address 2015-01-18 20:21:14 +02:00
autogen.sh autogen.sh: Use $PATH_SEPARATOR as a path separator of ACLOCAL_PATH 2025-10-03 10:29:57 -07:00
ChangeLog Fix some typos 2022-01-09 17:34:35 +01:00
CHANGES Move the revision history into the documentation 2008-07-14 02:45:57 -04:00
configure.ac Remove nroff from configure.ac and Makefile.in 2026-06-07 18:27:49 -07:00
INSTALL Fix some typos 2022-01-09 17:34:35 +01:00
LICENSE treewide: replace verbose copyright headers with SPDX tags 2025-10-01 11:45:31 -07:00
Makefile.in Rename emacstok.pl back to nasmtok.pl 2026-06-21 14:34:09 -07:00
nasm.spec.in nasm.spec.in: change http:// to https:// 2025-10-09 17:19:54 -07:00
nasm.spec.sed nasm.spec: use a sed file to insert perl dependencies 2017-04-23 18:54:23 -07:00
nasm.txt Fix some typos 2022-01-09 17:34:35 +01:00
ndisasm.txt ndisasm: man -- Add missing -p option 2013-04-20 20:18:46 +04:00
README.md doc: remove references to sourceforge 2020-07-01 21:48:44 -07:00
SubmittingPatches SubmittingPatches: more up to date information about the patch format 2026-06-11 12:47:32 -07:00
version NASM 3.02rc10 2026-06-25 15:16:19 -07:00
version.pl Move editor help files to editors/, add NASM version number 2025-10-02 13:49:43 -07:00

README.md

NASM, the Netwide Assembler

master

Many many developers all over the net respect NASM for what it is: a widespread (thus netwide), portable (thus netwide!), very flexible and mature assembler tool with support for many output formats (thus netwide!!).

Now we have good news for you: NASM is licensed under the "simplified" (2-clause) BSD license. This means its development is open to even wider society of programmers wishing to improve their lovely assembler.

Visit our nasm.us website for more details.

With best regards, the NASM crew.