changes

开源的nasm编译器源码,研究编译器原理很有帮且

0.98p6
------

* Took officially over coordination of the 0.98 release; so drop
  the p3.x notation. Skipped p4 and p5 to avoid confusion with John
  Fine's J4 and J5 releases.
* Update the documentation; however, it still doesn't include
  documentation for the various new instructions.  I somehow wonder if
  it makes sense to have an instruction set reference in the assembler
  manual when Intel et al have PDF versions of their manuals online.
* Recognize "idt" or "centaur" for the -p option to ndisasm.
* Changed error messages back to stderr where they belong, but add an
  -E option to redirect them elsewhere (the DOS shell cannot redirect
  stderr.)
* -M option to generate Makefile dependencies (based on code from Alex
  Verstak.)
* %undef preprocessor directive, and -u option, that undefines a
  single-line macro.
* OS/2 Makefile (Mkfiles/Makefile.os2) for Borland under OS/2; from
  Chuck Crayne.
* Various minor bugfixes (reported by):
  - Dangling %s in preproc.c (Martin Junker)
* THERE ARE KNOWN BUGS IN SSE AND THE OTHER KATMAI INSTRUCTIONS.  I am
  on a trip and didn't bring the Katmai instruction reference, so I
  can't work on them right now.
* Updated the License file per agreement with Simon and Jules to
  include a GPL distribution clause.


0.98p3.7
--------

* (Hopefully) fixed the canned Makefiles to include the outrdf2 and
  zoutieee modules.
* Renamed changes.asm to changed.asm.


0.98p3.6
--------

* Fixed a bunch of instructions that were added in 0.98p3.5 which had
  memory operands, and the address-size prefix was missing from the
  instruction pattern.


0.98p3.5
--------

* Merged in changes from John S. Fine's 0.98-J5 release.  John's based
  0.98-J5 on my 0.98p3.3 release; this merges the changes.
* Expanded the instructions flag field to a long so we can fit more
  flags; mark SSE (KNI) and AMD or Katmai-specific instructions as
  such.
* Fix the "PRIV" flag on a bunch of instructions, and create new
  "PROT" flag for protected-mode-only instructions (orthogonal to if
  the instruction is privileged!) and new "SMM" flag for SMM-only
  instructions.
* Added AMD-only SYSCALL and SYSRET instructions.
* Make SSE actually work, and add new Katmai MMX instructions.
* Added a -p (preferred vendor) option to ndisasm so that it can
  distinguish e.g. Cyrix opcodes also used in SSE.  For example:

	ndisasm -p cyrix aliased.bin
	00000000  670F514310        paddsiw mm0,[ebx+0x10]
	00000005  670F514320        paddsiw mm0,[ebx+0x20]
	ndisasm -p intel aliased.bin
	00000000  670F514310        sqrtps xmm0,[ebx+0x10]
	00000005  670F514320        sqrtps xmm0,[ebx+0x20]
* Added a bunch of Cyrix-specific instructions.


0.98p3.4
--------

* Made at least an attempt to modify all the additional Makefiles (in
  the Mkfiles directory).  I can't test it, but this was the best I
  could do.
* DOS DJGPP+"Opus Make" Makefile from John S. Fine.
* changes.asm changes from John S. Fine.


0.98p3.3
--------

* Patch from Conan Brink to allow nesting of %rep directives.
* If we're going to allow INT01 as an alias for INT1/ICEBP (one of
  Jules 0.98p3 changes), then we should allow INT03 as an alias for INT3
  as well.
* Updated changes.asm to include the latest changes.
* Tried to clean up the <CR>s that had snuck in from a DOS/Windows
  environment into my Unix environment, and try to make sure than
  DOS/Windows users get them back.
* We would silently generate broken tools if insns.dat wasn't sorted
  properly.  Change insns.pl so that the order doesn't matter.
* Fix bug in insns.pl (introduced by me) which would cause conditional
  instructions to have an extra "cc" in disassembly, e.g. "jnz"
  disassembled as "jccnz".


0.98p3.2
--------

* Merged in John S. Fine's changes from his 0.98-J4 prerelease; see
  http://www.csoft.net/cz/johnfine/
* Changed previous "spotless" Makefile target (appropriate for distribution)
  to "distclean", and added "cleaner" target which is same as "clean"
  except deletes files generated by Perl scripts; "spotless" is union.
* Removed BASIC programs from distribution.  Get a Perl interpreter
  instead (see below.)
* Calling this "pre-release 3.2" rather than "p3-hpa2" because of
  John's contributions.
* Actually link in the IEEE output format (zoutieee.c); fix a bunch of
  compiler warnings in that file.  Note I don't know what IEEE output
  is supposed to look like, so these changes were made "blind".


0.98p3-hpa
----------

* Merged nasm098p3.zip with nasm-0.97.tar.gz to create a fully
  buildable version for Unix systems (Makefile.in updates, etc.)
* Changed insns.pl to create the instruction tables in nasm.h and
  names.c, so that a new instruction can be added by adding it *only*
  to insns.dat.
* Added the following new instructions: SYSENTER, SYSEXIT, FXSAVE,
  FXRSTOR, UD1, UD2 (the latter two are two opcodes that Intel
  guarantee will never be used; one of them is documented as UD2 in
  Intel documentation, the other one just as "Undefined Opcode" --
  calling it UD1 seemed to make sense.)
* MAX_SYMBOL was defined to be 9, but LOADALL286 and LOADALL386 are 10
  characters long.  Now MAX_SYMBOL is derived from insns.dat.
* A note on the BASIC programs included: forget them.  insns.bas is
  already out of date.  Get yourself a Perl interpreter for your
  platform of choice at:

	http://www.cpan.org/ports/index.html


0.98 pre-release 3
-------------------

added response file support, improved command line handling, new layout
help screen

fixed limit checking bug, 'OUT byte nn, reg' bug, and a couple of rdoff
related bugs, updated Wishlist; 0.98 Prerelease 3.


0.98 pre-release 2
-------------------

fixed bug in outcoff.c to do with truncating section names longer
than 8 characters, referencing beyond end of string; 0.98 pre-release 2


0.98 pre-released May 1999
--------------------------

Fixed a bug whereby STRUC didn't work at all in RDF.

Fixed a problem with group specification in PUBDEFs in OBJ.

Improved ease of adding new output formats. Contribution due to
Fox Cutter.

Fixed a bug in relocations in the `bin' format: was showing up when
a relocatable reference crossed an 8192-byte boundary in any output
section.

Fixed a bug in local labels: local-label lookups were inconsistent
between passes one and two if an EQU occurred between the definition
of a global label and the subsequent use of a local label local to
that global.

Fixed a seg-fault in the preprocessor (again) which happened when
you use a blank line as the first line of a multi-line macro
definition and then defined a label on the same line as a call to
that macro.

Fixed a stale-pointer bug in the handling of the NASM environment
variable. Thanks to Thomas McWilliams.

ELF had a hard limit on the number of sections which caused
segfaults when transgressed. Fixed.

Added ability for ndisasm to read from stdin by using `-' as the
filename.

ndisasm wasn't outputting the TO keyword. Fixed.

Fixed error cascade on bogus expression in %if - an error in
evaluation was causing the entire %if to be discarded, thus creating
trouble later when the %else or %endif was encountered.

Forward reference tracking was instruction-granular not operand-
granular, which was causing 286-specific code to be generated
needlessly on code of the form `shr word [forwardref],1'. Thanks to
Jim Hague for sending a patch.

All messages now appear on stdout, as sending them to stderr serves
no useful purpose other than to make redirection difficult.

Fixed the problem with EQUs pointing to an external symbol - this
now generates an error message.

Allowed multiple size prefixes to an operand, of which only the first
is taken into account.

Incorporated John Fine's changes, including fixes of a large number
of preprocessor bugs, some small problems in OBJ, and a reworking of
label handling to define labels before their line is assembled, rather
than after.

Reformatted a lot of the source code to be more readable. Included
'coding.txt' as a guideline for how to format code for contributors.

Stopped nested %reps causing a panic - they now cause a slightly more
friendly error message instead.

Fixed floating point constant problems (patch by Pedro Gimeno)

Fixed the return value of insn_size() not being checked for -1, indicating
an error.

Incorporated 3D now instructions.

Fixed the 'mov eax, eax + ebx' bug.

Fixed the GLOBAL EQU bug in ELF. Released developers release 3.

Incorporated John Fine's command line parsing changes

Incorporated David Lindauer's OMF debug support

Made changes for LCC 4.0 support (__NASM_CDecl__, removed register size
specification warning when sizes agree).

Released NASM 0.98 Pre-release 1


0.97 released December 1997
---------------------------

This was entirely a bug-fix release to 0.96, which seems to have got
cursed. Silly me.

Fixed stupid mistake in OBJ which caused `MOV EAX,<constant>' to
fail. Caused by an error in the `MOV EAX,<segment>' support.

ndisasm hung at EOF when compiled with lcc on Linux because lcc on
Linux somehow breaks feof(). ndisasm now does not rely on feof().

A heading in the documentation was missing due to a markup error in
the indexing. Fixed.

Fixed failure to update all pointers on realloc() within extended-
operand code in parser.c. Was causing wrong behaviour and seg faults
on lines such as `dd 0.0,0.0,0.0,0.0,...'

Fixed a subtle preprocessor bug whereby invoking one multi-line
macro on the first line of the expansion of another, when the second
had been invoked with a label defined before it, didn't expand the
inner macro. 

Added internal.doc back in to the distribution archives - it was
missing in 0.96 *blush*

Fixed bug causing 0.96 to be unable to assemble its own test files,
specifically objtest.asm. *blush again*

Fixed seg-faults and bogus error messages caused by mismatching
%rep and %endrep within multi-line macro definitions.

Fixed a problem with buffer overrun in OBJ, which was causing
corruption at ends of long PUBDEF records.

Separated DOS archives into main-program and documentation to reduce
download size.


0.96 released November 1997
---------------------------

Fixed a bug whereby, if `nasm sourcefile' would cause a filename
collision warning and put output into `nasm.out', then `nasm
sourcefile -o outputfile' still gave the warning even though the
`-o' was honoured.

Fixed name pollution under Digital UNIX: one of its header files
defined R_SP, which broke the enum in nasm.h.

Fixed minor instruction table problems: FUCOM and FUCOMP didn't have
two-operand forms; NDISASM didn't recognise the longer register
forms of PUSH and POP (eg FF F3 for PUSH BX); TEST mem,imm32 was
flagged as undocumented; the 32-bit forms of CMOV had 16-bit operand
size prefixes; `AAD imm' and `AAM imm' are no longer flagged as
undocumented because the Intel Architecture reference documents
them.

Fixed a problem with the local-label mechanism, whereby strange
types of symbol (EQUs, auto-defined OBJ segment base symbols)
interfered with the `previous global label' value and screwed up
local labels.

Fixed a bug whereby the stub preprocessor didn't communicate with
the listing file generator, so that the -a and -l options in
conjunction would produce a useless listing file.

Merged `os2' object file format back into `obj', after discovering
that `obj' _also_ shouldn't have a link pass separator in a module
containing a non-trivial MODEND. Flat segments are now declared
using the FLAT attribute. `os2' is no longer a valid object format
name: use `obj'.

Removed the fixed-size temporary storage in the evaluator. Very very
long expressions (like `mov ax,1+1+1+1+...' for two hundred 1s or
so) should now no longer crash NASM.

Fixed a bug involving segfaults on disassembly of MMX instructions,
by changing the meaning of one of the operand-type flags in nasm.h.
This may cause other apparently unrelated MMX problems; it needs to
be tested thoroughly.

Fixed some buffer overrun problems with large OBJ output files.
Thanks to DJ Delorie for the bug report and fix.

Made preprocess-only mode actually listen to the %line markers as it
prints them, so that it can report errors more sanely.

Re-designed the evaluator to keep more sensible track of expressions
involving forward references: can now cope with previously-nightmare
situations such as
   mov ax,foo | bar
   foo equ 1
   bar equ 2

Added the ALIGN and ALIGNB standard macros.

Added PIC support in ELF: use of WRT to obtain the four extra
relocation types needed.

Added the ability for output file formats to define their own
extensions to the GLOBAL, COMMON and EXTERN directives.