reactos/lib/3rdparty/softx86/changes.txt

v0.00.0033: Jonathan Campbell
 - Added helper function softx87_connect_to_CPU()
   to ease CPU <=> FPU connection for programmers.
 - Added softx86_set_intvect().
 - Added general API functions softx86_make_simple_near_call(),
   softx86_make_simple_far_call(), softx86_make_simple_interrupt_call(),
   to make it easier for the program to manually invoke
   calls to program code within the virtual environment.
 - Added FBLD and FBSTP emulation
 - Added FLD1, FLDL2T and other constant-related FPU instruction emulation
 - Added FCLEX & FSCALE emulation
 - Added F2XM1 & FCOM emulation
 - Added FDIV, FDIVR, and FICOM emulation

v0.00.0032: Jonathan Campbell
 - Using the 'u' command multiple times without
   arguments now continues the decompiler from
   where it left off, rather than restarting at
   CS:IP
 - Fixed a bug that caused Softx86dbg to crash if
   run without an executable image to debug.
 - Fixed a an error in the code that causes Softx86dbg
   to crash when debugging a .COM file. See
   http://sourceforge.net/tracker/index.php?func=detail&aid=919504&group_id=76259&atid=546548
   for details.
 - Added code to stop emulation and alert the user
   if the instruction pointer wanders into areas
   that normally do not contain code (e.g. the
   interrupt vector table, the BIOS data area,
   adapter ROM areas, etc).
 - Fixed up INT 21h AH=4Ch/AH=00h code that would
   have otherwise failed if AL was anything but 00h.
 - Cleaned up interrupt handler system in Softx86dbg.

v0.00.0031: Jonathan Campbell
 - Added command "!ramdump" to dump the entire 1MB
   simulated RAM buffer to a file so you can then
   examine it further with your favorite hex editor.
 - Fixed coding mistake in .EXE relocation code that
   caused corruption of the .EXE image, as well as
   incorrect relocations
 - Added check for .EXE files with funny entry point
   values (e.g. 0xFFF0:0x0100) that ultimately translate
   to valid offsets (such as the very beginning of the
   resident area). Attempts to debug these previously
   caused softx86dbg to crash. These EXEs were probably
   converted from .COM images anyway.
 - Fixed 'D' and 'U' command parsing bugs in softx86dbg
   that failed to recognize first segment value
   if it started with A-F (e.g. BF45:1233)
 - Fixed incorrect assignment of DS and ES when
   setting up .EXE emulated environment in
   softx86dbg. DS and ES now point to PSP segment
   instead of the first paragraph of the EXE
   binary.
 - Fixed bugs dealing with group 80h instructions
   that are using an 8-bit sign-extended immediate
   value with a 16-bit parameter.
 - It turns out DOS DEBUG.EXE (at least the one
   bundled with Windows XP) also supports multiple
   steps with t followed by the number of steps.
   The funny thing is that it assumes the number
   is hexadecimal... whatever.

v0.00.0030: Jonathan Campbell
 - More FADD fixes
 - Softx86dbg shows FPU contents in scientific notation
 - Added FSUB, FSUBP emulation
 - Added FABS, FCHS, FRNDINT
 - Soft86 context structure modified so that the structure
   itself stays the same size and format even if additions
   are made to sub-structures
 - Softx87 will no longer be distributed separately from
   the main source tarball
 - New documentation!

v0.00.0029: Jonathan Campbell
 - Fixes for FADD
 - Integer -> float conversion now normalizes the values.

v0.00.0028: Jonathan Campbell
 - Added FADD, FADDP, FIADD 8087 instructions

v0.00.0027: Jonathan Campbell
 - Fixed LOCK decompiler not printing anything to the buffer.
 - Enhanced FPU backend and started development on
   Softx87, an 8087 FPU emulation engine designed to tie
   into Softx86.
 - Added FINIT, FNOP, FLD, FINCSTP, FDECSTP, FFREE
 - install.sh is no longer regenerated
 - More intelligent makefile now checks for presence of
   NASM and softx87 source tree. If you didn't download
   the softx87 code with softx86, softx86dbg is compiled
   and built without 8087 emulation support. If you don't
   have NASM the samples are not built and are skipped.

v0.00.0026: Jonathan Campbell
 - Added callback-based backend so that Softx86 can
   hand FPU opcodes off to other libraries or subroutines
   assigned to emulating the 80x87 FPU. If no callbacks
   for this have been assigned Softx86 treats the opcode
   as unknown.
 - Added version information to the context structure.
 - Fixed bug in softx86dbg's handling of the 'R' register
   change command for the segment registers.
 - Added callback for CPU resets.

v0.00.0025: Jonathan Campbell
 - Added group 3-1A (0xF6/0xF7 opcodes) TEST r/m,
   NOT r/m, NEG r/m, MUL r/m, IMUL r/m, DIV r/m, IDIV r/m.
 - Added LOOP/LOOPZ/LOOPNZ.
 - Added ENTER/LEAVE.
 - Added LES and LDS.
 - Added BOUND.
 - The entire 8086 instruction set is now implemented in
   this library (at least the ones that Intel documents).
   Let me know if I'm wrong. If this proves to be a sturdy
   implementation I might re-release this as the official
   v1.0 beta! Let me know if any undocumented instructions
   should be implemented.

v0.00.0024: Jonathan Campbell
 - Added RCL and RCR

v0.00.0023: Jonathan Campbell
 - Added SHL, SHR, and SAR
 - Added some helpful constants in softx86.h that can be used
   in shifting operations to obtain specific bits in the FLAGS
   register, like this:

   t = (ctx->stage.flags>>SX86_CPUFLAGBO_PARITY)&1;

   instead of:

   t = (ctx->stage.flags&SX86_CPUFLAG_PARITY)?1:0;

 - Added ROL, ROR

v0.00.0022: Jonathan Campbell
 - Added PUSHA, POPA, LOCK

v0.00.0021: Jonathan Campbell
 - Fixed major mistake in FAR CALL/INTERRUPT stack framing
   code. Segment and offset values were pushed onto the
   stack in the wrong order!
 - Added CALL/JMP/CALL FAR/JMP FAR (0xFF /2 /3 /4 and /5)
 - Added preliminary code to start supporting 80286 instructions.
   softx86_init() now reports 8088/8086 emulation as stable,
   since 80% of the instructions have been implemented anyway.
   calling softx86_init() with SX86_CPULEVEL_80286 or
   SX86_CPULEVEL_80186 is now legal.
 - Fixed main Makefile. Somehow it got mixed up with another
   Makefile.

v0.00.0020: Jonathan Campbell
 - Added FAQ.
 - Fixed minor error in hypothetical I/O device at port 0x9A.
   16-bit data is now treated the same way that it would be if
   written as 8-bit data.
 - DOS 16-bit real-mode EXE loader. Now softx86dbg can debug
   MS-DOS EXEs.

v0.00.0019: Jonathan Campbell
 - Added PUSHF/POPF.
 - Added SAHF/LAHF---HA HA HA! LAHF! GET IT? :)
 - Added CMPS and SCAS
 - Updated instodo.txt to show some instructions that I forgot to
   mention were implemented already.
 - Fixed bug in REP loop code that continued looping even if
   ZF flag failed condition. This caused many REPNE SCASB loops to
   fail until it was fixed.

v0.00.0018: Jonathan Campbell
 - Fixed coding mistakes in segment prefix decoder (using >= not ==)
 - Added REP/REPZ prefix handling
 - Added MOVS, LODS, STOS
 - README file rewritten
 - Fixed SOFTX86DBG printing unshifted value ANDed from FLAGS for flag
   states (e.g. should be ZF=1 not ZF=64).
 - The 't' command under SOFTX86DBG now allows optional parameter to
   specify how many instructions to step through before returning. For
   example:
   
   t 27 

   means step through 27 instructions.
 - Added the ability to compile Softx86 and Softx86dbg using MINGW and
   Bloodshed Dev-C++ IDE.

v0.00.0017: Jonathan Campbell
 - Found a way to convince MSVC++ that Softx86 is a dependency of
   Softx86dbg. Reorganized project files so that the static library
   is a dependency of the DLL version, and the DLL version is a
   dependency of Softx86dbg. The DLL version now exports symbols
   from the compiled static library version instead of recompiling
   the entire library to produce the DLL.
 - Softx86dbg now has a pretty icon resource so you can easily
   identify it under Windows :)
 - Added JMP abs. direct far and CALL abs. direct far.
 - Fixed FAR and INTERRUPT stack frame code that put segment and
   offset values in the wrong order!
 - Added JMP/CALL rel8/rel16.

v0.00.0016: Jonathan Campbell
 - Added TEST and XCHG.
 - Added LEA (Load Effective Address)
 - Added TEST08.ASM to test the TEST/XCHG instructions.
 - Softx86dbg now shows CPU flags as CF=1, AF=0, etc. for clarity.

v0.00.0015: Jonathan Campbell
 - Added DAA, XLAT and DAS instructions.
 - Fixed a few subtle bugs in AAA and AAS emulation where final result
   was not masked with 0xF like it should have been.
 - Fixed AAA/AAS/AAM/AAD instructions to properly set CPU flags like they
   should.

v0.00.0014: Jonathan Campbell
 - Registers are now represented by a structure (a union really)
   rather than 16-bit word values that are referred to directly with
   Endian-sensitive code. I had never thought of using C/C++ unions
   like this before... thanks goes to Paul Muller for bringing this
   up. On the other hand... in the act of modifying all of the emulation
   code to handle the new arrangement it's possible that I broke
   something.... please let me know or fix it and e-mail the patch to
   me.
 - Added Jcc (JMP conditional) instructions (JCXZ,JA,JB,JL,JG,JP,JZ,JC...)

v0.00.0013: Jonathan Campbell
 - Added CMP and AND.

v0.00.0012: Jonathan Campbell
 - Added API call to "reset" the CPU.
 - Added XOR.
 - Added API call to get library version. This can be used when
   linked to the shared library to determine the version and
   whether or not it matches the #defines in softx86.h.

v0.00.0011: Jonathan Campbell
 - Fixed missing header file problems in MSVC++ project workspace
   files caused by renaming config.h to softx86cfg.h.
 - Fixed erroneous use of opcode functions where parameters were
   switched from their intended meaning. In other words, the
   executioneer functions were passing the destination as the
   source and the source as the destination. This causes the
   SUB and SBB instructions to add rather than subtract like
   they should.
 - Added SBB.
 - Added INT 3, INT n, INTO.
 - Added CPU interrupt handling (external and internal).
 - Added bug emulation.
 - Added host idle callback for finer emulation during the
   execution of an instruction.
 - Added CPU NMI code.
 - Softx86dbg now allows you to change register values by
   typing "r [regname]".
 - Softx86dbg now has very primitive INT 20h and INT 21h
   emulation.
 - Added fix for COM loading code in softx86dbg that would
   otherwise overrun the simulated RAM if the user were to
   try to debug a very large file.
 - More fixes; apparently whenever I transfer the tarball
   back and forth between my Linux box and my Windows box
   the install.sh script got munged with DOS \n\r sequences.
   This apparently causes Bash to come up with really weird
   error messages pointing to the functions and referring to
   'nstall.sh (wtf?!?). So from now on the Makefile automatically
   generates install.sh when you type "make" for the first time
   and removes install.sh file when you type "make distclean".

v0.00.0010: Jonathan Campbell
 - Added SUB and ADC.
 - Added ADD r/m,imm.
 - Make install improved, more intelligent, moved to install.sh
   as a shell script that is called when you type "make install".
 - Makefile script more intelligent, automatically creates "obj"
   subdirectories now (and removes them on "make distclean").
 - Changed BYTE_ORDER #define in softx86.h so that it doesn't
   conflict with headers in /usr/include. It is now called
   SX86_BYTE_ORDER.

v0.00.0009: Jonathan Campbell
 - Added IN/OUT instruction emulation.
 - Sample code to make use of IN/OUT and hypothetical
   hardware adding logic with I/O ports that softx86dbg
   provides for testing.
 - Fixed erroneous AF (Aux flag) emulation for ADD. Found
   out (and later found a reference to this in Intel's
   80286 documentation) that AF is set if the CPU, peforming
   addition one 4-bit nibble at a time (a 16/32-bit
   processor!?!) has to carry while adding the least
   significant nibbles. For example:
   0x04 + 0x06 = 0x0A           AF=0
   0x08 + 0x08 = 0x10           AF=1
   0x10 + 0xFF = 0x10F          AF=0
   0x1E + 0xFF = 0x11D          AF=1

v0.00.0008: Jonathan Campbell
 - Softx86 now compiles into a shared library for Linux and a
   DLL for Win32.

v0.00.0007: Jonathan Campbell
 - More work on the mod/reg/rm decoder
 - MOV [r/m],[segreg] and MOV AL/AX,[mem] implemented
 - MOV [r/m],[imm] implemented
 - More test assembly code

v0.00.0006: Jonathan Campbell
 - Apparently DOS DEBUG single-step command is 't', not 's'.
   Sorry :)
 - ADD mod/reg/rm and MOV mod/reg/rm implemented.
 - ADD al,imm8 and ADD ax,imm16 implemented.
 - Segment prefixes CS: DS: ES: and SS: now supported.

v0.00.0005: Jonathan Campbell
 - Installation of library and header files for Softx86 possible
   via "make install" command (if you are root).
 - Fixed some errors in README file, compiling instructions
   clearer now.

v0.00.0004: Jonathan Campbell
 - Linux/GCC makefiles.
 - Command line input written for Linux version.
 - SoftX86 documentation reference and summary included in source
   now.
 - Library archive output of SoftX86 for Linux.
 - More comments in softx86dbg to make it easier to understand.

v0.00.0003: Jonathan Campbell
 - More opcodes: RET n, RETF, RETF n, IRETD, HLT
 - Removed alignment code, statements about 80x86 CPU always
   accessing memory on aligned boundaries was wrong, based
   on mis-interpretation of CPU diagrams.
 - Instruction execution functions can now return value 3
   to indicate that the opcode was executed in full
   completeness but that a looping operation is in effect and
   that the instruction pointer should remain the same afterwards.

v0.00.0002: Jonathan Campbell
 - More one-byte opcodes added: CBW, CWDE, CWD, CDQ, CLC,
   CLD, CLI, CMC, STC, STD, STI
 - Made necessary additions to ? command in softx86dbg (now
   it honestly tells you all commands supported).
 - softx86dbg now heeds "warning" return value from libsoftx86
   and displays warning message.

v0.00.0001: Jonathan Campbell
 - Initial release
 - One-byte opcodes added: AAA, AAS, PUSH [reg], POP [reg],
   PUSH CS/DS/ES/SS, POP CS/DS/ES/SS, NOP
 - Preliminary library interface design
 - MSVC 6.0 project workspace files only---Linux Makefile
   soon to come
 - Program to test library with: softx86dbg
 - Sample assembly code to test library with:
   samples/test01.asm (NASM required to assemble)