2 \# NASM revision history in nasmdoc format
5 \H{cl-2.xx} NASM 2 Series
7 The NASM 2 series support x86-64, and is the production version of NASM
11 \S{cl-2.07} Version 2.07
13 \b NASM is now under the 2-clause BSD license. See \k{legal}.
15 \b Fix the section type for the \c{.strtab} section in the \c{elf64}
18 \b Fix the handling of \c{COMMON} directives in the \c{obj} output format.
20 \b New \c{ith} and \c{srec} output formats; these are variants of the
21 \c{bin} output format which output Intel hex and Motorola S-records,
22 respectively. See \k{ithfmt} and \k{srecfmt}.
24 \b \c{rdf2ihx} replaced with an enhanced \c{rdf2bin}, which can output
25 binary, COM, Intel hex or Motorola S-records.
27 \b The Windows installer now puts the NASM directory first in the
28 \c{PATH} of the "NASM Shell".
30 \b Revert the early expansion behavior of \c{%+} to pre-2.06 behavior:
31 \c{%+} is only expanded late.
33 \b Yet another Mach-O alignment fix.
35 \b Don't delete the list file on errors. Also, include error and
36 warning information in the list file.
38 \b Support for 64-bit Mach-O output, see \k{machofmt}.
40 \b Fix assert failure on certain operations that involve strings with
44 \S{cl-2.06} Version 2.06
46 \b This release is dedicated to the memory of Charles A. Crayne, long
47 time NASM developer as well as moderator of \c{comp.lang.asm.x86} and
48 author of the book \e{Serious Assembler}. We miss you, Chuck.
50 \b Support for indirect macro expansion (\c{%[...]}). See \k{indmacro}.
52 \b \c{%pop} can now take an argument, see \k{pushpop}.
54 \b The argument to \c{%use} is no longer macro-expanded. Use
55 \c{%[...]} if macro expansion is desired.
57 \b Support for thread-local storage in ELF32 and ELF64. See \k{elftls}.
59 \b Fix crash on \c{%ifmacro} without an argument.
61 \b Correct the arguments to the \c{POPCNT} instruction.
63 \b Fix section alignment in the Mach-O format.
65 \b Update AVX support to version 5 of the Intel specification.
67 \b Fix the handling of accesses to context-local macros from higher
68 levels in the context stack.
70 \b Treat \c{WAIT} as a prefix rather than as an instruction, thereby
71 allowing constructs like \c{O16 FSAVE} to work correctly.
73 \b Support for structures with a non-zero base offset. See \k{struc}.
75 \b Correctly handle preprocessor token concatenation (see \k{concat})
76 involving floating-point numbers.
78 \b The \c{PINSR} series of instructions have been corrected and
81 \b Removed AMD SSE5, replaced with the new XOP/FMA4/CVT16 (rev 3.03)
84 \b The ELF backends no longer automatically generate a \c{.comment} section.
86 \b Add additional "well-known" ELF sections with default attributes. See
90 \S{cl-2.05.01} Version 2.05.01
92 \b Fix the \c{-w}/\c{-W} option parsing, which was broken in NASM 2.05.
95 \S{cl-2.05} Version 2.05
97 \b Fix redundant REX.W prefix on \c{JMP reg64}.
99 \b Make the behaviour of \c{-O0} match NASM 0.98 legacy behavior.
102 \b \c{-w-user} can be used to suppress the output of \c{%warning} directives.
105 \b Fix bug where \c{ALIGN} would issue a full alignment datum instead of
108 \b Fix offsets in list files.
110 \b Fix \c{%include} inside multi-line macros or loops.
112 \b Fix error where NASM would generate a spurious warning on valid
113 optimizations of immediate values.
115 \b Fix arguments to a number of the \c{CVT} SSE instructions.
117 \b Fix RIP-relative offsets when the instruction carries an immediate.
119 \b Massive overhaul of the ELF64 backend for spec compliance.
121 \b Fix the Geode \c{PFRCPV} and \c{PFRSQRTV} instruction.
123 \b Fix the SSE 4.2 \c{CRC32} instruction.
126 \S{cl-2.04} Version 2.04
128 \b Sanitize macro handing in the \c{%error} directive.
130 \b New \c{%warning} directive to issue user-controlled warnings.
132 \b \c{%error} directives are now deferred to the final assembly phase.
134 \b New \c{%fatal} directive to immediately terminate assembly.
136 \b New \c{%strcat} directive to join quoted strings together.
138 \b New \c{%use} macro directive to support standard macro directives. See
141 \b Excess default parameters to \c{%macro} now issues a warning by default.
144 \b Fix \c{%ifn} and \c{%elifn}.
146 \b Fix nested \c{%else} clauses.
148 \b Correct the handling of nested \c{%rep}s.
150 \b New \c{%unmacro} directive to undeclare a multi-line macro.
153 \b Builtin macro \c{__PASS__} which expands to the current assembly pass.
156 \b \c{__utf16__} and \c{__utf32__} operators to generate UTF-16 and UTF-32
157 strings. See \k{unicode}.
159 \b Fix bug in case-insensitive matching when compiled on platforms that
160 don't use the \c{configure} script. Of the official release binaries,
161 that only affected the OS/2 binary.
163 \b Support for x87 packed BCD constants. See \k{bcdconst}.
165 \b Correct the \c{LTR} and \c{SLDT} instructions in 64-bit mode.
167 \b Fix unnecessary REX.W prefix on indirect jumps in 64-bit mode.
169 \b Add AVX versions of the AES instructions (\c{VAES}...).
171 \b Fix the 256-bit FMA instructions.
173 \b Add 256-bit AVX stores per the latest AVX spec.
175 \b VIA XCRYPT instructions can now be written either with or without
176 \c{REP}, apparently different versions of the VIA spec wrote them
179 \b Add missing 64-bit \c{MOVNTI} instruction.
181 \b Fix the operand size of \c{VMREAD} and \c{VMWRITE}.
183 \b Numerous bug fixes, especially to the AES, AVX and VTX instructions.
185 \b The optimizer now always runs until it converges. It also runs even
186 when disabled, but doesn't optimize. This allows most forward references
187 to be resolved properly.
189 \b \c{%push} no longer needs a context identifier; omitting the context
190 identifier results in an anonymous context.
193 \S{cl-2.03.01} Version 2.03.01
195 \b Fix buffer overflow in the listing module.
197 \b Fix the handling of hexadecimal escape codes in `...` strings.
199 \b The Postscript/PDF documentation has been reformatted.
201 \b The \c{-F} option now implies \c{-g}.
204 \S{cl-2.03} Version 2.03
206 \b Add support for Intel AVX, CLMUL and FMA instructions,
207 including YMM registers.
209 \b \c{dy}, \c{resy} and \c{yword} for 32-byte operands.
211 \b Fix some SSE5 instructions.
213 \b Intel \c{INVEPT}, \c{INVVPID} and \c{MOVBE} instructions.
215 \b Fix checking for critical expressions when the optimizer is enabled.
217 \b Support the DWARF debugging format for ELF targets.
219 \b Fix optimizations of signed bytes.
221 \b Fix operation on bigendian machines.
223 \b Fix buffer overflow in the preprocessor.
225 \b \c{SAFESEH} support for Win32, \c{IMAGEREL} for Win64 (SEH).
227 \b \c{%?} and \c{%??} to refer to the name of a macro itself. In particular,
228 \c{%idefine keyword $%?} can be used to make a keyword "disappear".
230 \b New options for dependency generation: \c{-MD}, \c{-MF},
231 \c{-MP}, \c{-MT}, \c{-MQ}.
233 \b New preprocessor directives \c{%pathsearch} and \c{%depend}; INCBIN
234 reimplemented as a macro.
236 \b \c{%include} now resolves macros in a sane manner.
238 \b \c{%substr} can now be used to get other than one-character substrings.
240 \b New type of character/string constants, using backquotes (\c{`...`}),
241 which support C-style escape sequences.
243 \b \c{%defstr} and \c{%idefstr} to stringize macro definitions before
246 \b Fix forward references used in \c{EQU} statements.
249 \S{cl-2.02} Version 2.02
251 \b Additional fixes for MMX operands with explicit \c{qword}, as well as
252 (hopefully) SSE operands with \c{oword}.
254 \b Fix handling of truncated strings with \c{DO}.
256 \b Fix segfaults due to memory overwrites when floating-point constants
259 \b Fix segfaults due to missing include files.
261 \b Fix OpenWatcom Makefiles for DOS and OS/2.
263 \b Add autogenerated instruction list back into the documentation.
265 \b ELF: Fix segfault when generating stabs, and no symbols have been
268 \b ELF: Experimental support for DWARF debugging information.
270 \b New compile date and time standard macros.
272 \b \c{%ifnum} now returns true for negative numbers.
274 \b New \c{%iftoken} test for a single token.
276 \b New \c{%ifempty} test for empty expansion.
278 \b Add support for the \c{XSAVE} instruction group.
280 \b Makefile for Netware/gcc.
282 \b Fix issue with some warnings getting emitted way too many times.
284 \b Autogenerated instruction list added to the documentation.
287 \S{cl-2.01} Version 2.01
289 \b Fix the handling of MMX registers with explicit \c{qword} tags on
290 memory (broken in 2.00 due to 64-bit changes.)
292 \b Fix the PREFETCH instructions.
294 \b Fix the documentation.
296 \b Fix debugging info when using \c{-f elf}
297 (backwards compatibility alias for \c{-f elf32}).
299 \b Man pages for rdoff tools (from the Debian project.)
301 \b ELF: handle large numbers of sections.
303 \b Fix corrupt output when the optimizer runs out of passes.
306 \S{cl-2.00} Version 2.00
308 \b Added c99 data-type compliance.
310 \b Added general x86-64 support.
312 \b Added win64 (x86-64 COFF) output format.
314 \b Added \c{__BITS__} standard macro.
316 \b Renamed the \c{elf} output format to \c{elf32} for clarity.
318 \b Added \c{elf64} and \c{macho} (MacOS X) output formats.
320 \b Added Numeric constants in \c{dq} directive.
322 \b Added \c{oword}, \c{do} and \c{reso} pseudo operands.
324 \b Allow underscores in numbers.
326 \b Added 8-, 16- and 128-bit floating-point formats.
328 \b Added binary, octal and hexadecimal floating-point.
330 \b Correct the generation of floating-point constants.
332 \b Added floating-point option control.
334 \b Added Infinity and NaN floating point support.
336 \b Added ELF Symbol Visibility support.
338 \b Added setting OSABI value in ELF header directive.
340 \b Added Generate Makefile Dependencies option.
342 \b Added Unlimited Optimization Passes option.
344 \b Added \c{%IFN} and \c{%ELIFN} support.
346 \b Added Logical Negation Operator.
348 \b Enhanced Stack Relative Preprocessor Directives.
350 \b Enhanced ELF Debug Formats.
352 \b Enhanced Send Errors to a File option.
354 \b Added SSSE3, SSE4.1, SSE4.2, SSE5 support.
356 \b Added a large number of additional instructions.
358 \b Significant performance improvements.
360 \b \c{-w+warning} and \c{-w-warning} can now be written as -Wwarning and
361 -Wno-warning, respectively. See \k{opt-w}.
363 \b Add \c{-w+error} to treat warnings as errors. See \k{opt-w}.
365 \b Add \c{-w+all} and \c{-w-all} to enable or disable all suppressible
366 warnings. See \k{opt-w}.
369 \H{cl-0.98.xx} NASM 0.98 Series
371 The 0.98 series was the production versions of NASM from 1999 to 2007.
374 \S{cl-0.98.39} Version 0.98.39
376 \b fix buffer overflow
378 \b fix outas86's \c{.bss} handling
380 \b "make spotless" no longer deletes config.h.in.
382 \b \c{%(el)if(n)idn} insensitivity to string quotes difference (#809300).
384 \b (nasm.c)\c{__OUTPUT_FORMAT__} changed to string value instead of symbol.
386 \S{cl-0.98.38} Version 0.98.38
389 \b Add Makefile for 16-bit DOS binaries under OpenWatcom, and modify
390 \c{mkdep.pl} to be able to generate completely pathless dependencies, as
391 required by OpenWatcom wmake (it supports path searches, but not
394 \b Fix the \c{STR} instruction.
396 \b Fix the ELF output format, which was broken under certain
397 circumstances due to the addition of stabs support.
399 \b Quick-fix Borland format debug-info for \c{-f obj}
401 \b Fix for \c{%rep} with no arguments (#560568)
403 \b Fix concatenation of preprocessor function call (#794686)
405 \b Fix long label causes coredump (#677841)
407 \b Use autoheader as well as autoconf to keep configure from generating
408 ridiculously long command lines.
410 \b Make sure that all of the formats which support debugging output
411 actually will suppress debugging output when \c{-g} not specified.
413 \S{cl-0.98.37} Version 0.98.37
416 \b Paths given in \c{-I} switch searched for \c{incbin}-ed as
417 well as \c{%include}-ed files.
419 \b Added stabs debugging for the ELF output format, patch from
422 \b Fix \c{output/outbin.c} to allow origin > 80000000h.
424 \b Make \c{-U} switch work.
426 \b Fix the use of relative offsets with explicit prefixes, e.g.
429 \b Remove \c{backslash()}.
431 \b Fix the \c{SMSW} and \c{SLDT} instructions.
433 \b \c{-O2} and \c{-O3} are no longer aliases for \c{-O10} and \c{-O15}.
434 If you mean the latter, please say so! :)
436 \S{cl-0.98.36} Version 0.98.36
439 \b Update rdoff - librarian/archiver - common rec - docs!
441 \b Fix signed/unsigned problems.
443 \b Fix \c{JMP FAR label} and \c{CALL FAR label}.
445 \b Add new multisection support - map files - fix align bug
447 \b Fix sysexit, movhps/movlps reg,reg bugs in insns.dat
449 \b \c{Q} or \c{O} suffixes indicate octal
451 \b Support Prescott new instructions (PNI).
453 \b Cyrix \c{XSTORE} instruction.
456 \S{cl-0.98.35} Version 0.98.35
458 \b Fix build failure on 16-bit DOS (Makefile.bc3 workaround for compiler bug.)
460 \b Fix dependencies and compiler warnings.
462 \b Add "const" in a number of places.
464 \b Add -X option to specify error reporting format (use -Xvc to
465 integrate with Microsoft Visual Studio.)
467 \b Minor changes for code legibility.
469 \b Drop use of tmpnam() in rdoff (security fix.)
472 \S{cl-0.98.34} Version 0.98.34
474 \b Correct additional address-size vs. operand-size confusions.
476 \b Generate dependencies for all Makefiles automatically.
478 \b Add support for unimplemented (but theoretically available)
479 registers such as tr0 and cr5. Segment registers 6 and 7 are called
480 segr6 and segr7 for the operations which they can be represented.
482 \b Correct some disassembler bugs related to redundant address-size prefixes.
483 Some work still remains in this area.
485 \b Correctly generate an error for things like "SEG eax".
487 \b Add the JMPE instruction, enabled by "CPU IA64".
489 \b Correct compilation on newer gcc/glibc platforms.
491 \b Issue an error on things like "jmp far eax".
494 \S{cl-0.98.33} Version 0.98.33
496 \b New __NASM_PATCHLEVEL__ and __NASM_VERSION_ID__ standard macros to
497 round out the version-query macros. version.pl now understands
498 X.YYplWW or X.YY.ZZplWW as a version number, equivalent to
499 X.YY.ZZ.WW (or X.YY.0.WW, as appropriate).
501 \b New keyword "strict" to disable the optimization of specific
504 \b Fix the handing of size overrides with JMP instructions
505 (instructions such as "jmp dword foo".)
507 \b Fix the handling of "ABSOLUTE label", where "label" points into a
510 \b Fix OBJ output format with lots of externs.
512 \b More documentation updates.
514 \b Add -Ov option to get verbose information about optimizations.
516 \b Undo a braindead change which broke \c{%elif} directives.
521 \S{cl-0.98.32} Version 0.98.32
523 \b Fix NASM crashing when \c{%macro} directives were left unterminated.
525 \b Lots of documentation updates.
527 \b Complete rewrite of the PostScript/PDF documentation generator.
529 \b The MS Visual C++ Makefile was updated and corrected.
531 \b Recognize .rodata as a standard section name in ELF.
533 \b Fix some obsolete Perl4-isms in Perl scripts.
535 \b Fix configure.in to work with autoconf 2.5x.
537 \b Fix a couple of "make cleaner" misses.
539 \b Make the normal "./configure && make" work with Cygwin.
542 \S{cl-0.98.31} Version 0.98.31
544 \b Correctly build in a separate object directory again.
546 \b Derive all references to the version number from the version file.
548 \b New standard macros __NASM_SUBMINOR__ and __NASM_VER__ macros.
550 \b Lots of Makefile updates and bug fixes.
552 \b New \c{%ifmacro} directive to test for multiline macros.
554 \b Documentation updates.
556 \b Fixes for 16-bit OBJ format output.
558 \b Changed the NASM environment variable to NASMENV.
561 \S{cl-0.98.30} Version 0.98.30
563 \b Changed doc files a lot: completely removed old READMExx and
564 Wishlist files, incorporating all information in CHANGES and TODO.
566 \b I waited a long time to rename zoutieee.c to (original) outieee.c
568 \b moved all output modules to output/ subdirectory.
570 \b Added 'make strip' target to strip debug info from nasm & ndisasm.
572 \b Added INSTALL file with installation instructions.
574 \b Added -v option description to nasm man.
576 \b Added dist makefile target to produce source distributions.
578 \b 16-bit support for ELF output format (GNU extension, but useful.)
581 \S{cl-0.98.28} Version 0.98.28
583 \b Fastcooked this for Debian's Woody release:
584 Frank applied the INCBIN bug patch to 0.98.25alt and called
585 it 0.98.28 to not confuse poor little apt-get.
588 \S{cl-0.98.26} Version 0.98.26
590 \b Reorganised files even better from 0.98.25alt
593 \S{cl-0.98.25alt} Version 0.98.25alt
595 \b Prettified the source tree. Moved files to more reasonable places.
597 \b Added findleak.pl script to misc/ directory.
599 \b Attempted to fix doc.
602 \S{cl-0.98.25} Version 0.98.25
604 \b Line continuation character \c{\\}.
606 \b Docs inadvertantly reverted - "dos packaging".
609 \S{cl-0.98.24p1} Version 0.98.24p1
611 \b FIXME: Someone, document this please.
614 \S{cl-0.98.24} Version 0.98.24
616 \b Documentation - Ndisasm doc added to Nasm.doc.
619 \S{cl-0.98.23} Version 0.98.23
621 \b Attempted to remove rdoff version1
623 \b Lino Mastrodomenico's patches to preproc.c (%$$ bug?).
626 \S{cl-0.98.22} Version 0.98.22
628 \b Update rdoff2 - attempt to remove v1.
631 \S{cl-0.98.21} Version 0.98.21
633 \b Optimization fixes.
636 \S{cl-0.98.20} Version 0.98.20
638 \b Optimization fixes.
641 \S{cl-0.98.19} Version 0.98.19
643 \b H. J. Lu's patch back out.
646 \S{cl-0.98.18} Version 0.98.18
648 \b Added ".rdata" to "-f win32".
651 \S{cl-0.98.17} Version 0.98.17
653 \b H. J. Lu's "bogus elf" patch. (Red Hat problem?)
656 \S{cl-0.98.16} Version 0.98.16
658 \b Fix whitespace before "[section ..." bug.
661 \S{cl-0.98.15} Version 0.98.15
663 \b Rdoff changes (?).
665 \b Fix fixes to memory leaks.
668 \S{cl-0.98.14} Version 0.98.14
673 \S{cl-0.98.13} Version 0.98.13
675 \b There was no 0.98.13
678 \S{cl-0.98.12} Version 0.98.12
680 \b Update optimization (new function of "-O1")
682 \b Changes to test/bintest.asm (?).
685 \S{cl-0.98.11} Version 0.98.11
687 \b Optimization changes.
692 \S{cl-0.98.10} Version 0.98.10
694 \b There was no 0.98.10
697 \S{cl-0.98.09} Version 0.98.09
699 \b Add multiple sections support to "-f bin".
701 \b Changed GLOBAL_TEMP_BASE in outelf.c from 6 to 15.
703 \b Add "-v" as an alias to the "-r" switch.
705 \b Remove "#ifdef" from Tasm compatibility options.
707 \b Remove redundant size-overrides on "mov ds, ex", etc.
709 \b Fixes to SSE2, other insns.dat (?).
711 \b Enable uppercase "I" and "P" switches.
713 \b Case insinsitive "seg" and "wrt".
715 \b Update install.sh (?).
717 \b Allocate tokens in blocks.
719 \b Improve "invalid effective address" messages.
722 \S{cl-0.98.08} Version 0.98.08
724 \b Add "\c{%strlen}" and "\c{%substr}" macro operators
726 \b Fixed broken c16.mac.
728 \b Unterminated string error reported.
730 \b Fixed bugs as per 0.98bf
733 \S{cl-0.98.09b with John Coffman patches released 28-Oct-2001} Version 0.98.09b with John Coffman patches released 28-Oct-2001
735 Changes from 0.98.07 release to 98.09b as of 28-Oct-2001
737 \b More closely compatible with 0.98 when -O0 is implied
738 or specified. Not strictly identical, since backward
739 branches in range of short offsets are recognized, and signed
740 byte values with no explicit size specification will be
741 assembled as a single byte.
743 \b More forgiving with the PUSH instruction. 0.98 requires
744 a size to be specified always. 0.98.09b will imply the size
745 from the current BITS setting (16 or 32).
747 \b Changed definition of the optimization flag:
749 -O0 strict two-pass assembly, JMP and Jcc are
750 handled more like 0.98, except that back-
751 ward JMPs are short, if possible.
753 -O1 strict two-pass assembly, but forward
754 branches are assembled with code guaranteed
755 to reach; may produce larger code than
756 -O0, but will produce successful assembly
757 more often if branch offset sizes are not
760 -O2 multi-pass optimization, minimize branch
761 offsets; also will minimize signed immed-
762 iate bytes, overriding size specification.
764 -O3 like -O2, but more passes taken, if needed
767 \S{cl-0.98.07 released 01/28/01} Version 0.98.07 released 01/28/01
769 \b Added Stepane Denis' SSE2 instructions to a *working*
770 version of the code - some earlier versions were based on
771 broken code - sorry 'bout that. version "0.98.07"
777 \b Cosmetic modifications to nasm.c, nasm.h,
781 \S{cl-0.98.06f released 01/18/01} Version 0.98.06f released 01/18/01
784 \b - Add "metalbrain"s jecxz bug fix in insns.dat
785 - alter nasmdoc.src to match - version "0.98.06f"
788 \S{cl-0.98.06e released 01/09/01} Version 0.98.06e released 01/09/01
791 \b Removed the "outforms.h" file - it appears to be
792 someone's old backup of "outform.h". version "0.98.06e"
796 \b fbk - finally added the fix for the "multiple %includes bug",
797 known since 7/27/99 - reported originally (?) and sent to
798 us by Austin Lunnen - he reports that John Fine had a fix
799 within the day. Here it is...
801 \b Nelson Rush resigns from the group. Big thanks to Nelson for
802 his leadership and enthusiasm in getting these changes
803 incorporated into Nasm!
805 \b fbk - [list +], [list -] directives - ineptly implemented, should
806 be re-written or removed, perhaps.
808 \b Brian Raiter / fbk - "elfso bug" fix - applied to aoutb format
809 as well - testing might be desirable...
813 \b James Seter - -postfix, -prefix command line switches.
815 \b Yuri Zaporogets - rdoff utility changes.
818 \S{cl-0.98p1} Version 0.98p1
820 \b GAS-like palign (Panos Minos)
822 \b FIXME: Someone, fill this in with details
825 \S{cl-0.98bf (bug-fixed)} Version 0.98bf (bug-fixed)
827 \b Fixed - elf and aoutb bug - shared libraries
828 - multiple "%include" bug in "-f obj"
830 - unrecognized option bug in ndisasm
832 \S{cl-0.98.03 with John Coffman's changes released 27-Jul-2000} Version 0.98.03 with John Coffman's changes released 27-Jul-2000
834 \b Added signed byte optimizations for the 0x81/0x83 class
835 of instructions: ADC, ADD, AND, CMP, OR, SBB, SUB, XOR:
836 when used as 'ADD reg16,imm' or 'ADD reg32,imm.' Also
837 optimization of signed byte form of 'PUSH imm' and 'IMUL
838 reg,imm'/'IMUL reg,reg,imm.' No size specification is needed.
840 \b Added multi-pass JMP and Jcc offset optimization. Offsets
841 on forward references will preferentially use the short form,
842 without the need to code a specific size (short or near) for
843 the branch. Added instructions for 'Jcc label' to use the
844 form 'Jnotcc $+3/JMP label', in cases where a short offset
845 is out of bounds. If compiling for a 386 or higher CPU, then
846 the 386 form of Jcc will be used instead.
848 This feature is controlled by a new command-line switch: "O",
849 (upper case letter O). "-O0" reverts the assembler to no
850 extra optimization passes, "-O1" allows up to 5 extra passes,
851 and "-O2"(default), allows up to 10 extra optimization passes.
853 \b Added a new directive: 'cpu XXX', where XXX is any of:
854 8086, 186, 286, 386, 486, 586, pentium, 686, PPro, P2, P3 or
855 Katmai. All are case insensitive. All instructions will
856 be selected only if they apply to the selected cpu or lower.
857 Corrected a couple of bugs in cpu-dependence in 'insns.dat'.
859 \b Added to 'standard.mac', the "use16" and "use32" forms of
860 the "bits 16/32" directive. This is nothing new, just conforms
861 to a lot of other assemblers. (minor)
863 \b Changed label allocation from 320/32 (10000 labels @ 200K+)
864 to 32/37 (1000 labels); makes running under DOS much easier.
865 Since additional label space is allocated dynamically, this
866 should have no effect on large programs with lots of labels.
867 The 37 is a prime, believed to be better for hashing. (minor)
870 \S{cl-0.98.03} Version 0.98.03
872 "Integrated patchfile 0.98-0.98.01. I call this version 0.98.03 for
873 historical reasons: 0.98.02 was trashed." --John Coffman
874 <johninsd@san.rr.com>, 27-Jul-2000
876 \b Kendall Bennett's SciTech MGL changes
878 \b Note that you must define "TASM_COMPAT" at compile-time
879 to get the Tasm Ideal Mode compatibility.
881 \b All changes can be compiled in and out using the TASM_COMPAT macros,
882 and when compiled without TASM_COMPAT defined we get the exact same
883 binary as the unmodified 0.98 sources.
885 \b standard.mac, macros.c: Added macros to ignore TASM directives before
888 \b nasm.h: Added extern declaration for tasm_compatible_mode
890 \b nasm.c: Added global variable tasm_compatible_mode
892 \b Added command line switch for TASM compatible mode (-t)
894 \b Changed version command line to reflect when compiled with TASM additions
896 \b Added response file processing to allow all arguments on a single
897 line (response file is @resp rather than -@resp for NASM format).
899 \b labels.c: Changes islocal() macro to support TASM style @@local labels.
901 \b Added islocalchar() macro to support TASM style @@local labels.
903 \b parser.c: Added support for TASM style memory references (ie: mov
904 [DWORD eax],10 rather than the NASM style mov DWORD [eax],10).
906 \b preproc.c: Added new directives, \c{%arg}, \c{%local}, \c{%stacksize} to directives
909 \b Added support for TASM style directives without a leading % symbol.
911 \b Integrated a block of changes from Andrew Zabolotny <bit@eltech.ru>:
913 \b A new keyword \c{%xdefine} and its case-insensitive counterpart \c{%ixdefine}.
914 They work almost the same way as \c{%define} and \c{%idefine} but expand
915 the definition immediately, not on the invocation. Something like a cross
916 between \c{%define} and \c{%assign}. The "x" suffix stands for "eXpand", so
917 "xdefine" can be deciphered as "expand-and-define". Thus you can do
923 \c %xdefine %1 dword [esp+ofs]
927 \b Changed the place where the expansion of %$name macros are expanded.
928 Now they are converted into ..@ctxnum.name form when detokenizing, so
929 there are no quirks as before when using %$name arguments to macros,
930 in macros etc. For example:
939 Now last line will be expanded into "hello" as expected. This also allows
940 for lots of goodies, a good example are extended "proc" macros included
943 \b Added a check for "cstk" in smacro_defined() before calling get_ctx() -
944 this allows for things like:
949 to work without warnings even in no context.
951 \b Added a check for "cstk" in %if*ctx and %elif*ctx directives -
952 this allows to use \c{%ifctx} without excessive warnings. If there is
953 no active context, \c{%ifctx} goes through "false" branch.
955 \b Removed "user error: " prefix with \c{%error} directive: it just clobbers the
956 output and has absolutely no functionality. Besides, this allows to write
957 macros that does not differ from built-in functions in any way.
959 \b Added expansion of string that is output by \c{%error} directive. Now you
962 \c %define hello(x) Hello, x!
964 \c %define %$name andy
965 \c %error "hello(%$name)"
967 Same happened with \c{%include} directive.
969 \b Now all directives that expect an identifier will try to expand and
970 concatenate everything without whitespaces in between before usage.
971 For example, with "unfixed" nasm the commands
973 \c %define %$abc hello
974 \c %define __%$abc goodbye
977 would produce "incorrect" output: last line will expand to
979 \c hello goodbyehello
981 Not quite what you expected, eh? :-) The answer is that preprocessor
982 treats the \c{%define} construct as if it would be
984 \c %define __ %$abc goodbye
986 (note the white space between __ and %$abc). After my "fix" it
987 will "correctly" expand into
991 as expected. Note that I use quotes around words "correct", "incorrect"
992 etc because this is rather a feature not a bug; however current behaviour
993 is more logical (and allows more advanced macro usage :-).
995 Same change was applied to:
996 \c{%push},\c{%macro},\c{%imacro},\c{%define},\c{%idefine},\c{%xdefine},\c{%ixdefine},
997 \c{%assign},\c{%iassign},\c{%undef}
999 \b A new directive [WARNING {+|-}warning-id] have been added. It works only
1000 if the assembly phase is enabled (i.e. it doesn't work with nasm -e).
1002 \b A new warning type: macro-selfref. By default this warning is disabled;
1003 when enabled NASM warns when a macro self-references itself; for example
1004 the following source:
1006 \c [WARNING macro-selfref]
1017 will produce a warning, but if we remove the first line we won't see it
1018 anymore (which is The Right Thing To Do {tm} IMHO since C preprocessor
1019 eats such constructs without warnings at all).
1021 \b Added a "error" routine to preprocessor which always will set ERR_PASS1
1022 bit in severity_code. This removes annoying repeated errors on first
1023 and second passes from preprocessor.
1025 \b Added the %+ operator in single-line macros for concatenating two
1026 identifiers. Usage example:
1028 \c %define _myfunc _otherfunc
1029 \c %define cextern(x) _ %+ x
1032 After first expansion, third line will become "_myfunc". After this
1033 expansion is performed again so it becomes "_otherunc".
1035 \b Now if preprocessor is in a non-emitting state, no warning or error
1036 will be emitted. Example:
1041 \c put anything you want between these two brackets,
1042 \c even macro-parameter references %1 or local
1043 \c labels %$zz or macro-local labels %%zz - no
1044 \c warning will be emitted.
1047 \b Context-local variables on expansion as a last resort are looked up
1048 in outer contexts. For example, the following piece:
1051 \c %define %$a [esp]
1058 will expand correctly the fourth line to [esp]; if we'll define another
1059 %$a inside the "inner" context, it will take precedence over outer
1060 definition. However, this modification has been applied only to
1061 expand_smacro and not to smacro_define: as a consequence expansion
1062 looks in outer contexts, but \c{%ifdef} won't look in outer contexts.
1064 This behaviour is needed because we don't want nested contexts to
1065 act on already defined local macros. Example:
1067 \c %define %$arg1 [esp+4]
1073 In this example the "if" mmacro enters into the "if" context, so %$arg1
1074 is not valid anymore inside "if". Of course it could be worked around
1075 by using explicitely %$$arg1 but this is ugly IMHO.
1077 \b Fixed memory leak in \c{%undef}. The origline wasn't freed before
1080 \b Fixed trap in preprocessor when line expanded to empty set of tokens.
1081 This happens, for example, in the following case:
1083 \c #define SOMETHING
1087 \S{cl-0.98} Version 0.98
1089 All changes since NASM 0.98p3 have been produced by H. Peter Anvin <hpa@zytor.com>.
1091 \b The documentation comment delimiter is \# not #.
1093 \b Allow EQU definitions to refer to external labels; reported by
1096 \b Re-enable support for RDOFF v1; reported by Pedro Gimeno.
1098 \b Updated License file per OK from Simon and Julian.
1101 \S{cl-0.98p9} Version 0.98p9
1103 \b Update documentation (although the instruction set reference will
1104 have to wait; I don't want to hold up the 0.98 release for it.)
1106 \b Verified that the NASM implementation of the PEXTRW and PMOVMSKB
1107 instructions is correct. The encoding differs from what the Intel
1108 manuals document, but the Pentium III behaviour matches NASM, not
1111 \b Fix handling of implicit sizes in PSHUFW and PINSRW, reported by
1114 \b Resurrect the -s option, which was removed when changing the
1115 diagnostic output to stdout.
1118 \S{cl-0.98p8} Version 0.98p8
1120 \b Fix for "DB" when NASM is running on a bigendian machine.
1122 \b Invoke insns.pl once for each output script, making Makefile.in
1123 legal for "make -j".
1125 \b Improve the Unix configure-based makefiles to make package
1128 \b Included an RPM .spec file for building RPM (RedHat Package Manager)
1129 packages on Linux or Unix systems.
1131 \b Fix Makefile dependency problems.
1133 \b Change src/rdsrc.pl to include sectioning information in info
1134 output; required for install-info to work.
1136 \b Updated the RDOFF distribution to version 2 from Jules; minor
1137 massaging to make it compile in my environment.
1139 \b Split doc files that can be built by anyone with a Perl interpreter off
1140 into a separate archive.
1142 \b "Dress rehearsal" release!
1145 \S{cl-0.98p7} Version 0.98p7
1147 \b Fixed opcodes with a third byte-sized immediate argument to not
1148 complain if given "byte" on the immediate.
1150 \b Allow \c{%undef} to remove single-line macros with arguments. This
1151 matches the behaviour of #undef in the C preprocessor.
1153 \b Allow -d, -u, -i and -p to be specified as -D, -U, -I and -P for
1154 compatibility with most C compilers and preprocessors. This allows
1155 Makefile options to be shared between cc and nasm, for example.
1159 \b Went through the list of Katmai instructions and hopefully fixed the
1160 (rather few) mistakes in it.
1162 \b (Hopefully) fixed a number of disassembler bugs related to ambiguous
1163 instructions (disambiguated by -p) and SSE instructions with REP.
1165 \b Fix for bug reported by Mark Junger: "call dword 0x12345678" should
1166 work and may add an OSP (affected CALL, JMP, Jcc).
1168 \b Fix for environments when "stderr" isn't a compile-time constant.
1171 \S{cl-0.98p6} Version 0.98p6
1174 \b Took officially over coordination of the 0.98 release; so drop
1175 the p3.x notation. Skipped p4 and p5 to avoid confusion with John
1176 Fine's J4 and J5 releases.
1178 \b Update the documentation; however, it still doesn't include
1179 documentation for the various new instructions. I somehow wonder if
1180 it makes sense to have an instruction set reference in the assembler
1181 manual when Intel et al have PDF versions of their manuals online.
1183 \b Recognize "idt" or "centaur" for the -p option to ndisasm.
1185 \b Changed error messages back to stderr where they belong, but add an
1186 -E option to redirect them elsewhere (the DOS shell cannot redirect
1189 \b -M option to generate Makefile dependencies (based on code from Alex
1192 \b \c{%undef} preprocessor directive, and -u option, that undefines a
1195 \b OS/2 Makefile (Mkfiles/Makefile.os2) for Borland under OS/2; from
1198 \b Various minor bugfixes (reported by):
1199 - Dangling \c{%s} in preproc.c (Martin Junker)
1201 \b THERE ARE KNOWN BUGS IN SSE AND THE OTHER KATMAI INSTRUCTIONS. I am
1202 on a trip and didn't bring the Katmai instruction reference, so I
1203 can't work on them right now.
1205 \b Updated the License file per agreement with Simon and Jules to
1206 include a GPL distribution clause.
1209 \S{cl-0.98p3.7} Version 0.98p3.7
1211 \b (Hopefully) fixed the canned Makefiles to include the outrdf2 and
1214 \b Renamed changes.asm to changed.asm.
1217 \S{cl-0.98p3.6} Version 0.98p3.6
1219 \b Fixed a bunch of instructions that were added in 0.98p3.5 which had
1220 memory operands, and the address-size prefix was missing from the
1221 instruction pattern.
1224 \S{cl-0.98p3.5} Version 0.98p3.5
1226 \b Merged in changes from John S. Fine's 0.98-J5 release. John's based
1227 0.98-J5 on my 0.98p3.3 release; this merges the changes.
1229 \b Expanded the instructions flag field to a long so we can fit more
1230 flags; mark SSE (KNI) and AMD or Katmai-specific instructions as
1233 \b Fix the "PRIV" flag on a bunch of instructions, and create new
1234 "PROT" flag for protected-mode-only instructions (orthogonal to if
1235 the instruction is privileged!) and new "SMM" flag for SMM-only
1238 \b Added AMD-only SYSCALL and SYSRET instructions.
1240 \b Make SSE actually work, and add new Katmai MMX instructions.
1242 \b Added a -p (preferred vendor) option to ndisasm so that it can
1243 distinguish e.g. Cyrix opcodes also used in SSE. For example:
1245 \c ndisasm -p cyrix aliased.bin
1246 \c 00000000 670F514310 paddsiw mm0,[ebx+0x10]
1247 \c 00000005 670F514320 paddsiw mm0,[ebx+0x20]
1248 \c ndisasm -p intel aliased.bin
1249 \c 00000000 670F514310 sqrtps xmm0,[ebx+0x10]
1250 \c 00000005 670F514320 sqrtps xmm0,[ebx+0x20]
1252 \b Added a bunch of Cyrix-specific instructions.
1255 \S{cl-0.98p3.4} Version 0.98p3.4
1257 \b Made at least an attempt to modify all the additional Makefiles (in
1258 the Mkfiles directory). I can't test it, but this was the best I
1261 \b DOS DJGPP+"Opus Make" Makefile from John S. Fine.
1263 \b changes.asm changes from John S. Fine.
1266 \S{cl-0.98p3.3} Version 0.98p3.3
1268 \b Patch from Conan Brink to allow nesting of \c{%rep} directives.
1270 \b If we're going to allow INT01 as an alias for INT1/ICEBP (one of
1271 Jules 0.98p3 changes), then we should allow INT03 as an alias for INT3
1274 \b Updated changes.asm to include the latest changes.
1276 \b Tried to clean up the <CR>s that had snuck in from a DOS/Windows
1277 environment into my Unix environment, and try to make sure than
1278 DOS/Windows users get them back.
1280 \b We would silently generate broken tools if insns.dat wasn't sorted
1281 properly. Change insns.pl so that the order doesn't matter.
1283 \b Fix bug in insns.pl (introduced by me) which would cause conditional
1284 instructions to have an extra "cc" in disassembly, e.g. "jnz"
1285 disassembled as "jccnz".
1288 \S{cl-0.98p3.2} Version 0.98p3.2
1290 \b Merged in John S. Fine's changes from his 0.98-J4 prerelease; see
1291 http://www.csoft.net/cz/johnfine/
1293 \b Changed previous "spotless" Makefile target (appropriate for distribution)
1294 to "distclean", and added "cleaner" target which is same as "clean"
1295 except deletes files generated by Perl scripts; "spotless" is union.
1297 \b Removed BASIC programs from distribution. Get a Perl interpreter
1298 instead (see below.)
1300 \b Calling this "pre-release 3.2" rather than "p3-hpa2" because of
1301 John's contributions.
1303 \b Actually link in the IEEE output format (zoutieee.c); fix a bunch of
1304 compiler warnings in that file. Note I don't know what IEEE output
1305 is supposed to look like, so these changes were made "blind".
1308 \S{cl-0.98p3-hpa} Version 0.98p3-hpa
1310 \b Merged nasm098p3.zip with nasm-0.97.tar.gz to create a fully
1311 buildable version for Unix systems (Makefile.in updates, etc.)
1313 \b Changed insns.pl to create the instruction tables in nasm.h and
1314 names.c, so that a new instruction can be added by adding it *only*
1317 \b Added the following new instructions: SYSENTER, SYSEXIT, FXSAVE,
1318 FXRSTOR, UD1, UD2 (the latter two are two opcodes that Intel
1319 guarantee will never be used; one of them is documented as UD2 in
1320 Intel documentation, the other one just as "Undefined Opcode" --
1321 calling it UD1 seemed to make sense.)
1323 \b MAX_SYMBOL was defined to be 9, but LOADALL286 and LOADALL386 are 10
1324 characters long. Now MAX_SYMBOL is derived from insns.dat.
1326 \b A note on the BASIC programs included: forget them. insns.bas is
1327 already out of date. Get yourself a Perl interpreter for your
1328 platform of choice at
1329 \W{http://www.cpan.org/ports/index.html}{http://www.cpan.org/ports/index.html}.
1332 \S{cl-0.98p3} Version 0.98 pre-release 3
1334 \b added response file support, improved command line handling, new layout
1337 \b fixed limit checking bug, 'OUT byte nn, reg' bug, and a couple of rdoff
1338 related bugs, updated Wishlist; 0.98 Prerelease 3.
1341 \S{cl-0.98p2} Version 0.98 pre-release 2
1343 \b fixed bug in outcoff.c to do with truncating section names longer
1344 than 8 characters, referencing beyond end of string; 0.98 pre-release 2
1347 \S{cl-0.98p1} Version 0.98 pre-release 1
1349 \b Fixed a bug whereby STRUC didn't work at all in RDF.
1351 \b Fixed a problem with group specification in PUBDEFs in OBJ.
1353 \b Improved ease of adding new output formats. Contribution due to
1356 \b Fixed a bug in relocations in the `bin' format: was showing up when
1357 a relocatable reference crossed an 8192-byte boundary in any output
1360 \b Fixed a bug in local labels: local-label lookups were inconsistent
1361 between passes one and two if an EQU occurred between the definition
1362 of a global label and the subsequent use of a local label local to
1365 \b Fixed a seg-fault in the preprocessor (again) which happened when
1366 you use a blank line as the first line of a multi-line macro
1367 definition and then defined a label on the same line as a call to
1370 \b Fixed a stale-pointer bug in the handling of the NASM environment
1371 variable. Thanks to Thomas McWilliams.
1373 \b ELF had a hard limit on the number of sections which caused
1374 segfaults when transgressed. Fixed.
1376 \b Added ability for ndisasm to read from stdin by using `-' as the
1379 \b ndisasm wasn't outputting the TO keyword. Fixed.
1381 \b Fixed error cascade on bogus expression in \c{%if} - an error in
1382 evaluation was causing the entire \c{%if} to be discarded, thus creating
1383 trouble later when the \c{%else} or \c{%endif} was encountered.
1385 \b Forward reference tracking was instruction-granular not operand-
1386 granular, which was causing 286-specific code to be generated
1387 needlessly on code of the form `shr word [forwardref],1'. Thanks to
1388 Jim Hague for sending a patch.
1390 \b All messages now appear on stdout, as sending them to stderr serves
1391 no useful purpose other than to make redirection difficult.
1393 \b Fixed the problem with EQUs pointing to an external symbol - this
1394 now generates an error message.
1396 \b Allowed multiple size prefixes to an operand, of which only the first
1397 is taken into account.
1399 \b Incorporated John Fine's changes, including fixes of a large number
1400 of preprocessor bugs, some small problems in OBJ, and a reworking of
1401 label handling to define labels before their line is assembled, rather
1404 \b Reformatted a lot of the source code to be more readable. Included
1405 'coding.txt' as a guideline for how to format code for contributors.
1407 \b Stopped nested \c{%reps} causing a panic - they now cause a slightly more
1408 friendly error message instead.
1410 \b Fixed floating point constant problems (patch by Pedro Gimeno)
1412 \b Fixed the return value of insn_size() not being checked for -1, indicating
1415 \b Incorporated 3Dnow! instructions.
1417 \b Fixed the 'mov eax, eax + ebx' bug.
1419 \b Fixed the GLOBAL EQU bug in ELF. Released developers release 3.
1421 \b Incorporated John Fine's command line parsing changes
1423 \b Incorporated David Lindauer's OMF debug support
1425 \b Made changes for LCC 4.0 support (\c{__NASM_CDecl__}, removed register size
1426 specification warning when sizes agree).
1429 \H{cl-0.9x} NASM 0.9 Series
1431 Revisions before 0.98.
1434 \S{cl-0.97} Version 0.97 released December 1997
1436 \b This was entirely a bug-fix release to 0.96, which seems to have got
1439 \b Fixed stupid mistake in OBJ which caused `MOV EAX,<constant>' to
1440 fail. Caused by an error in the `MOV EAX,<segment>' support.
1442 \b ndisasm hung at EOF when compiled with lcc on Linux because lcc on
1443 Linux somehow breaks feof(). ndisasm now does not rely on feof().
1445 \b A heading in the documentation was missing due to a markup error in
1446 the indexing. Fixed.
1448 \b Fixed failure to update all pointers on realloc() within extended-
1449 operand code in parser.c. Was causing wrong behaviour and seg faults
1450 on lines such as `dd 0.0,0.0,0.0,0.0,...'
1452 \b Fixed a subtle preprocessor bug whereby invoking one multi-line
1453 macro on the first line of the expansion of another, when the second
1454 had been invoked with a label defined before it, didn't expand the
1457 \b Added internal.doc back in to the distribution archives - it was
1458 missing in 0.96 *blush*
1460 \b Fixed bug causing 0.96 to be unable to assemble its own test files,
1461 specifically objtest.asm. *blush again*
1463 \b Fixed seg-faults and bogus error messages caused by mismatching
1464 \c{%rep} and \c{%endrep} within multi-line macro definitions.
1466 \b Fixed a problem with buffer overrun in OBJ, which was causing
1467 corruption at ends of long PUBDEF records.
1469 \b Separated DOS archives into main-program and documentation to reduce
1473 \S{cl-0.96} Version 0.96 released November 1997
1475 \b Fixed a bug whereby, if `nasm sourcefile' would cause a filename
1476 collision warning and put output into `nasm.out', then `nasm
1477 sourcefile -o outputfile' still gave the warning even though the
1479 Fixed name pollution under Digital UNIX: one of its header files
1480 defined R_SP, which broke the enum in nasm.h.
1482 \b Fixed minor instruction table problems: FUCOM and FUCOMP didn't have
1483 two-operand forms; NDISASM didn't recognise the longer register
1484 forms of PUSH and POP (eg FF F3 for PUSH BX); TEST mem,imm32 was
1485 flagged as undocumented; the 32-bit forms of CMOV had 16-bit operand
1486 size prefixes; `AAD imm' and `AAM imm' are no longer flagged as
1487 undocumented because the Intel Architecture reference documents
1490 \b Fixed a problem with the local-label mechanism, whereby strange
1491 types of symbol (EQUs, auto-defined OBJ segment base symbols)
1492 interfered with the `previous global label' value and screwed up
1495 \b Fixed a bug whereby the stub preprocessor didn't communicate with
1496 the listing file generator, so that the -a and -l options in
1497 conjunction would produce a useless listing file.
1499 \b Merged `os2' object file format back into `obj', after discovering
1500 that `obj' _also_ shouldn't have a link pass separator in a module
1501 containing a non-trivial MODEND. Flat segments are now declared
1502 using the FLAT attribute. `os2' is no longer a valid object format
1505 \b Removed the fixed-size temporary storage in the evaluator. Very very
1506 long expressions (like `mov ax,1+1+1+1+...' for two hundred 1s or
1507 so) should now no longer crash NASM.
1509 \b Fixed a bug involving segfaults on disassembly of MMX instructions,
1510 by changing the meaning of one of the operand-type flags in nasm.h.
1511 This may cause other apparently unrelated MMX problems; it needs to
1512 be tested thoroughly.
1514 \b Fixed some buffer overrun problems with large OBJ output files.
1515 Thanks to DJ Delorie for the bug report and fix.
1517 \b Made preprocess-only mode actually listen to the \c{%line} markers as it
1518 prints them, so that it can report errors more sanely.
1520 \b Re-designed the evaluator to keep more sensible track of expressions
1521 involving forward references: can now cope with previously-nightmare
1528 \b Added the ALIGN and ALIGNB standard macros.
1530 \b Added PIC support in ELF: use of WRT to obtain the four extra
1531 relocation types needed.
1533 \b Added the ability for output file formats to define their own
1534 extensions to the GLOBAL, COMMON and EXTERN directives.
1536 \b Implemented common-variable alignment, and global-symbol type and
1537 size declarations, in ELF.
1539 \b Implemented NEAR and FAR keywords for common variables, plus
1540 far-common element size specification, in OBJ.
1542 \b Added a feature whereby EXTERNs and COMMONs in OBJ can be given a
1543 default WRT specification (either a segment or a group).
1545 \b Transformed the Unix NASM archive into an auto-configuring package.
1547 \b Added a sanity-check for people applying SEG to things which are
1548 already segment bases: this previously went unnoticed by the SEG
1549 processing and caused OBJ-driver panics later.
1551 \b Added the ability, in OBJ format, to deal with `MOV EAX,<segment>'
1552 type references: OBJ doesn't directly support dword-size segment
1553 base fixups, but as long as the low two bytes of the constant term
1554 are zero, a word-size fixup can be generated instead and it will
1557 \b Added the ability to specify sections' alignment requirements in
1558 Win32 object files and pure binary files.
1560 \b Added preprocess-time expression evaluation: the \c{%assign} (and
1561 \c{%iassign}) directive and the bare \c{%if} (and \c{%elif}) conditional. Added
1562 relational operators to the evaluator, for use only in \c{%if}
1563 constructs: the standard relationals = < > <= >= <> (and C-like
1564 synonyms == and !=) plus low-precedence logical operators &&, ^^ and
1567 \b Added a preprocessor repeat construct: \c{%rep} / \c{%exitrep} / \c{%endrep}.
1569 \b Added the __FILE__ and __LINE__ standard macros.
1571 \b Added a sanity check for number constants being greater than
1572 0xFFFFFFFF. The warning can be disabled.
1574 \b Added the %0 token whereby a variadic multi-line macro can tell how
1575 many parameters it's been given in a specific invocation.
1577 \b Added \c{%rotate}, allowing multi-line macro parameters to be cycled.
1579 \b Added the `*' option for the maximum parameter count on multi-line
1580 macros, allowing them to take arbitrarily many parameters.
1582 \b Added the ability for the user-level forms of EXTERN, GLOBAL and
1583 COMMON to take more than one argument.
1585 \b Added the IMPORT and EXPORT directives in OBJ format, to deal with
1588 \b Added some more preprocessor \c{%if} constructs: \c{%ifidn} / \c{%ifidni} (exact
1589 textual identity), and \c{%ifid} / \c{%ifnum} / \c{%ifstr} (token type testing).
1591 \b Added the ability to distinguish SHL AX,1 (the 8086 version) from
1592 SHL AX,BYTE 1 (the 286-and-upwards version whose constant happens to
1595 \b Added NetBSD/FreeBSD/OpenBSD's variant of a.out format, complete
1596 with PIC shared library features.
1598 \b Changed NASM's idiosyncratic handling of FCLEX, FDISI, FENI, FINIT,
1599 FSAVE, FSTCW, FSTENV, and FSTSW to bring it into line with the
1600 otherwise accepted standard. The previous behaviour, though it was a
1601 deliberate feature, was a deliberate feature based on a
1602 misunderstanding. Apologies for the inconvenience.
1604 \b Improved the flexibility of ABSOLUTE: you can now give it an
1605 expression rather than being restricted to a constant, and it can
1606 take relocatable arguments as well.
1608 \b Added the ability for a variable to be declared as EXTERN multiple
1609 times, and the subsequent definitions are just ignored.
1611 \b We now allow instruction prefixes (CS, DS, LOCK, REPZ etc) to be
1612 alone on a line (without a following instruction).
1614 \b Improved sanity checks on whether the arguments to EXTERN, GLOBAL
1615 and COMMON are valid identifiers.
1617 \b Added misc/exebin.mac to allow direct generation of .EXE files by
1618 hacking up an EXE header using DB and DW; also added test/binexe.asm
1619 to demonstrate the use of this. Thanks to Yann Guidon for
1620 contributing the EXE header code.
1622 \b ndisasm forgot to check whether the input file had been successfully
1623 opened. Now it does. Doh!
1625 \b Added the Cyrix extensions to the MMX instruction set.
1627 \b Added a hinting mechanism to allow [EAX+EBX] and [EBX+EAX] to be
1628 assembled differently. This is important since [ESI+EBP] and
1629 [EBP+ESI] have different default base segment registers.
1631 \b Added support for the PharLap OMF extension for 4096-byte segment
1635 \S{cl-0.95 released July 1997} Version 0.95 released July 1997
1637 \b Fixed yet another ELF bug. This one manifested if the user relied on
1638 the default segment, and attempted to define global symbols without
1639 first explicitly declaring the target segment.
1641 \b Added makefiles (for NASM and the RDF tools) to build Win32 console
1642 apps under Symantec C++. Donated by Mark Junker.
1644 \b Added `macros.bas' and `insns.bas', QBasic versions of the Perl
1645 scripts that convert `standard.mac' to `macros.c' and convert
1646 `insns.dat' to `insnsa.c' and `insnsd.c'. Also thanks to Mark
1649 \b Changed the diassembled forms of the conditional instructions so
1650 that JB is now emitted as JC, and other similar changes. Suggested
1651 list by Ulrich Doewich.
1653 \b Added `@' to the list of valid characters to begin an identifier
1656 \b Documentary changes, notably the addition of the `Common Problems'
1657 section in nasm.doc.
1659 \b Fixed a bug relating to 32-bit PC-relative fixups in OBJ.
1661 \b Fixed a bug in perm_copy() in labels.c which was causing exceptions
1662 in cleanup_labels() on some systems.
1664 \b Positivity sanity check in TIMES argument changed from a warning to
1665 an error following a further complaint.
1667 \b Changed the acceptable limits on byte and word operands to allow
1668 things like `~10111001b' to work.
1670 \b Fixed a major problem in the preprocessor which caused seg-faults if
1671 macro definitions contained blank lines or comment-only lines.
1673 \b Fixed inadequate error checking on the commas separating the
1674 arguments to `db', `dw' etc.
1676 \b Fixed a crippling bug in the handling of macros with operand counts
1677 defined with a `+' modifier.
1679 \b Fixed a bug whereby object file formats which stored the input file
1680 name in the output file (such as OBJ and COFF) weren't doing so
1681 correctly when the output file name was specified on the command
1684 \b Removed [INC] and [INCLUDE] support for good, since they were
1687 \b Fixed a bug in OBJ which caused all fixups to be output in 16-bit
1688 (old-format) FIXUPP records, rather than putting the 32-bit ones in
1689 FIXUPP32 (new-format) records.
1691 \b Added, tentatively, OS/2 object file support (as a minor variant on
1694 \b Updates to Fox Cutter's Borland C makefile, Makefile.bc2.
1696 \b Removed a spurious second fclose() on the output file.
1698 \b Added the `-s' command line option to redirect all messages which
1699 would go to stderr (errors, help text) to stdout instead.
1701 \b Added the `-w' command line option to selectively suppress some
1702 classes of assembly warning messages.
1704 \b Added the `-p' pre-include and `-d' pre-define command-line options.
1706 \b Added an include file search path: the `-i' command line option.
1708 \b Fixed a silly little preprocessor bug whereby starting a line with a
1709 `%!' environment-variable reference caused an `unknown directive'
1712 \b Added the long-awaited listing file support: the `-l' command line
1715 \b Fixed a problem with OBJ format whereby, in the absence of any
1716 explicit segment definition, non-global symbols declared in the
1717 implicit default segment generated spurious EXTDEF records in the
1720 \b Added the NASM environment variable.
1722 \b From this version forward, Win32 console-mode binaries will be
1723 included in the DOS distribution in addition to the 16-bit binaries.
1724 Added Makefile.vc for this purpose.
1726 \b Added `return 0;' to test/objlink.c to prevent compiler warnings.
1728 \b Added the __NASM_MAJOR__ and __NASM_MINOR__ standard defines.
1730 \b Added an alternative memory-reference syntax in which prefixing an
1731 operand with `&' is equivalent to enclosing it in square brackets,
1732 at the request of Fox Cutter.
1734 \b Errors in pass two now cause the program to return a non-zero error
1735 code, which they didn't before.
1737 \b Fixed the single-line macro cycle detection, which didn't work at
1738 all on macros with no parameters (caused an infinite loop). Also
1739 changed the behaviour of single-line macro cycle detection to work
1740 like cpp, so that macros like `extrn' as given in the documentation
1743 \b Fixed the implementation of WRT, which was too restrictive in that
1744 you couldn't do `mov ax,[di+abc wrt dgroup]' because (di+abc) wasn't
1745 a relocatable reference.
1748 \S{cl-0.94 released April 1997} Version 0.94 released April 1997
1751 \b Major item: added the macro processor.
1753 \b Added undocumented instructions SMI, IBTS, XBTS and LOADALL286. Also
1754 reorganised CMPXCHG instruction into early-486 and Pentium forms.
1755 Thanks to Thobias Jones for the information.
1757 \b Fixed two more stupid bugs in ELF, which were causing `ld' to
1758 continue to seg-fault in a lot of non-trivial cases.
1760 \b Fixed a seg-fault in the label manager.
1762 \b Stopped FBLD and FBSTP from _requiring_ the TWORD keyword, which is
1763 the only option for BCD loads/stores in any case.
1765 \b Ensured FLDCW, FSTCW and FSTSW can cope with the WORD keyword, if
1766 anyone bothers to provide it. Previously they complained unless no
1767 keyword at all was present.
1769 \b Some forms of FDIV/FDIVR and FSUB/FSUBR were still inverted: a
1770 vestige of a bug that I thought had been fixed in 0.92. This was
1771 fixed, hopefully for good this time...
1773 \b Another minor phase error (insofar as a phase error can _ever_ be
1774 minor) fixed, this one occurring in code of the form
1776 \c rol ax,forward_reference
1777 \c forward_reference equ 1
1779 \b The number supplied to TIMES is now sanity-checked for positivity,
1780 and also may be greater than 64K (which previously didn't work on
1783 \b Added Watcom C makefiles, and misc/pmw.bat, donated by Dominik Behr.
1785 \b Added the INCBIN pseudo-opcode.
1787 \b Due to the advent of the preprocessor, the [INCLUDE] and [INC]
1788 directives have become obsolete. They are still supported in this
1789 version, with a warning, but won't be in the next.
1791 \b Fixed a bug in OBJ format, which caused incorrect object records to
1792 be output when absolute labels were made global.
1794 \b Updates to RDOFF subdirectory, and changes to outrdf.c.
1797 \S{cl-0.93 released January 1997} Version 0.93 released January 1997
1799 This release went out in a great hurry after semi-crippling bugs
1802 \b Really \e{did} fix the stack overflows this time. *blush*
1804 \b Had problems with EA instruction sizes changing between passes, when
1805 an offset contained a forward reference and so 4 bytes were
1806 allocated for the offset in pass one; by pass two the symbol had
1807 been defined and happened to be a small absolute value, so only 1
1808 byte got allocated, causing instruction size mismatch between passes
1809 and hence incorrect address calculations. Fixed.
1811 \b Stupid bug in the revised ELF section generation fixed (associated
1812 string-table section for .symtab was hard-coded as 7, even when this
1813 didn't fit with the real section table). Was causing `ld' to
1814 seg-fault under Linux.
1816 \b Included a new Borland C makefile, Makefile.bc2, donated by Fox
1817 Cutter <lmb@comtch.iea.com>.
1820 \S{cl-0.92 released January 1997} Version 0.92 released January 1997
1822 \b The FDIVP/FDIVRP and FSUBP/FSUBRP pairs had been inverted: this was
1823 fixed. This also affected the LCC driver.
1825 \b Fixed a bug regarding 32-bit effective addresses of the form
1826 \c{[other_register+ESP]}.
1828 \b Documentary changes, notably documentation of the fact that Borland
1829 Win32 compilers use `obj' rather than `win32' object format.
1831 \b Fixed the COMENT record in OBJ files, which was formatted
1834 \b Fixed a bug causing segfaults in large RDF files.
1836 \b OBJ format now strips initial periods from segment and group
1837 definitions, in order to avoid complications with the local label
1840 \b Fixed a bug in disassembling far calls and jumps in NDISASM.
1842 \b Added support for user-defined sections in COFF and ELF files.
1844 \b Compiled the DOS binaries with a sensible amount of stack, to
1845 prevent stack overflows on any arithmetic expression containing
1848 \b Fixed a bug in handling of files that do not terminate in a newline.
1851 \S{cl-0.91 released November 1996} Version 0.91 released November 1996
1853 \b Loads of bug fixes.
1855 \b Support for RDF added.
1857 \b Support for DBG debugging format added.
1859 \b Support for 32-bit extensions to Microsoft OBJ format added.
1861 \b Revised for Borland C: some variable names changed, makefile added.
1863 \b LCC support revised to actually work.
1865 \b JMP/CALL NEAR/FAR notation added.
1867 \b `a16', `o16', `a32' and `o32' prefixes added.
1869 \b Range checking on short jumps implemented.
1871 \b MMX instruction support added.
1873 \b Negative floating point constant support added.
1875 \b Memory handling improved to bypass 64K barrier under DOS.
1877 \b \c{$} prefix to force treatment of reserved words as identifiers added.
1879 \b Default-size mechanism for object formats added.
1881 \b Compile-time configurability added.
1883 \b \c{#}, \c{@}, \c{~} and c\{?} are now valid characters in labels.
1885 \b \c{-e} and \c{-k} options in NDISASM added.
1888 \S{cl-0.90 released October 1996} Version 0.90 released October 1996
1890 First release version. First support for object file output. Other
1891 changes from previous version (0.3x) too numerous to document.