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subttl emulator.hst - Emulator history.;***;emulator.hst - Emulator history.;; Copyright (c) 1984-89, Microsoft Corporation;;Purpose:; Contains history comments for emulator.;;; Bob Wallace, Microsoft, July 1982; John Pollock, Microsoft, August 1982; Marlin Eller, Microsoft, December 1982; Greg Whitten, Microsoft, February 1984; Brad Verheiden, Microsoft, March 1984; Jamie Bariteau, Microsoft, September 1985; Barry McCord, Microsoft, October 1986;;; Revision History;; 02/07/84 Greg Whitten; new stand-alone version (major restructuring); split up into small include files;; 02/17/84 Brad Verheiden; put transcendentals in same object file; fixed bug which always masked unemulated instruction;; 02/24/84 Greg Whitten; PASCAL naming convention is being slowly removed; adding initialization/termination code; code complete for initial standalone emulator;; 03/14/84 Greg Whitten; added a special truncate to 32-bit integer routine;; 03/15/84 Greg Whitten; fixed bug in FCOM ( cmpsw => cmpsb );; 03/19/84 Greg Whitten; added code for all segment overrides;; 03/29/84 Greg Whitten; fixed segment override bug;; 04/05/84 Greg Whitten; removed fast SP code;; 04/09/84 Brad Verheiden; added 8087 support;; 05/23/84 Brad Verheiden; Added code to save SI in ProcessOverUnderflow;; 08/18/84 Greg Whitten; REEXECUTE stored the status word when DS was invalid; if reexecuting a memory operand; Terminate8087 bad if original INT 2 vector was 0; Changed call to fpsignal routine - now registers; except for AX are good. al = error code;; 08/23/84 Greg Whitten; corrected COMPSIDI (COMPcsSIDI); affects routines using log and atan's;; 08/25/84 Greg Whitten; fixed bug with handling of denormals - not reloading; zero from the correct address;; 10/28/84 Greg Whitten; added environment segment to initialization for NO87; added code to save and restore interrupt vectors; 8087 only version;; 01/30/85 Greg Whitten; added OEM version check for automatic setup for 8087; this is not necessarily reliable;; 02/07/85 Greg Whitten; split OEM customization out into separate module; save and restore old interrupt vector values;; release C 3.00 and FORTRAN/Pascal 3.30;; 03/29/85 Greg Whitten; changed emulated FWAIT fixups to mov ax,ax; changed real 287 FWAIT on numeric instructions to NOPs;; release IBM C 1.0;; 08/13/85 Greg Whitten; changed fpmath trunc routines to check for errors;; 08/22/85 Greg Whitten; added PUB/GLB macros to define public symbols; for debugging;; 08/22/85 Greg Whitten; corrected a bug in denormalizing result with; zero mantissa and non-zero exponent; changed to zero exponent if mantissa is zero;; release FORTRAN/Pascal 3.31;; 09/02/85 Greg Whitten; completed adding PUB/GLB macros to define; public symbols for debugging;; 09/09/85 Greg Whitten; changed denormal exception handler for; faster normalization algorithm using 8087; FDIV[R] denormal memory operand;; 09/13/85 Jamie Bariteau; added comments to invalid processing in emexcept.asm; fixed bug in constant instruction decoding in emexcept; (stand-alone version only);; 09/30/85 Jamie Bariteau; start of C and FORTRAN 4.0 changes; emulator.asm:; changed memory temp REG8087ST2 to REG8087ST0; since ST(2) is no longer saved to memory but; ST(0) is.; emexcept.asm:; rewrote invalid exception handling to deal with; new stack overflow/underflow model;; 10/30/85 Greg Whitten; 11/03/85 more C and FORTRAN 4.0 changes; embedded version information for debugger; reordered data area; deleted unused data items; added UserStatusWord for status reporting; added __fpmath call for returning status; changed denormal handler so precision is not lost; on FMUL denormal;; 11/18/85 Jamie Bariteau; more C and Fortran 4.0 changes; emulated new set of arithmetic register instructions:; f<op> ST,ST(x); f<op> ST(x),ST; f<op>p ST,ST(x);; 11/19/85 Greg Whitten; (hack) change temp real denormals into 0 in normalize; some temp real denormals will not be caught;; 02/11/86 Greg Whitten; changed around some conditionals and removed unused; conditionals (MSDOS and XENIX);; 02/11/86 Greg Whitten; created frontend -only version of emulator; assumes no 8087 and limited instructions; (no transcendentals);; 02/12/86 Greg Whitten; corrected bug in exception handler with user status;; 03/20/86 Greg Whitten; fixed special arithmetic returns to use RESULT;; Version 4.00C 4.0;; 07/15/86 Greg Whitten; added dual DOS 5.0 and DOS 3.x support; added standalone and DOS 5 conditionals;; 09/25/86 Greg Whitten; added FCOM denormal exception support; added pseudo-zero checking to denormal exceptions;; 10/14/86 Greg Whitten; 386 version of the emulator for XENIX; added XENIX and i386 conditionals;; 10/09/86 Jamie Bariteau; Changed initialization of LIMstk to allow; more space between the end of the emulator; stack and DGROUP. The emulator was trashing; DS:0 before aborting with fp stack overflow.;; 10/15/86 Barry McCord; fixed no87= message to use DOSWRITE for; the DOS3/5 version of the emulator;; 01/02/87 Barry McCord; added FPREM emulation into the DOS3/5 version; of the emulator;; 02/12/87 Barry McCord; changed coprocessor detection mask in; EMINIT.ASM from 1F3Fh to 0F3Fh to allow; for A1 stepping of 80387, in which bit; 1000h of the control word remains high.;; 03/03/87 Greg Whitten; added QB3 support (special hacked emulator);; 04/01/87 Greg Whitten; merged sources for OS/2 and XENIX emulators; minor cleanup; - removed PCDOS switch;; Version 5.00;; 04/09/87 Barry McCord; added WINDOWS switch for Windows 2.00 support;; 05/01/87 Jamie Bariteau; moved FPREM data from emfprem.asm to emulator.asm; so that fptaskdata marks the end of the data area;; 05/04/87 Barry McCord; changed DOSWRITE to __DOSWRITE, etc.; for the DOS 3/5 emulator;; 05/05/87 Greg Whitten; XENIX 286/386 cleanup;; 05/14/87 Barry McCord; added exception handling support to "quiet"; the Invalid exception generated by fld (short/long; real operand) of an SNaN (only matters for 80387);; this was so that the compiler can do FLDs without; being concerned whether the (possibly stack-based); floating-point variable has been initialized.;; 06/19/87 Barry McCord; Windows 2.00 support ready for Windows SDK Beta 1;; 06/24/87 Barry McCord; Bug fix (BCP #1767) for FORTRAN 4.01.; Exception handler wasn't loading ST(1) from; memory when ST(0) was full but ST(1) was not; (for instructions taking 2 stack operands).;; 08/24/87 Barry McCord; Added emulation of fild qword ptr; and fistp qword ptr for the purpose of supporting; unsigned-long-to-float and float-to-unsigned-long; conversions for C 5.00.;; release C 5.00 / QuickC 1.00 / QuickBASIC 4.00; 10/19/87;; Version 5.10;; 11/07/87 Greg Whitten; added PCDOS (ifdef-style) switch back in for IBM Japan; added polling-style interrupt handler to eliminate; interrupt problem in real mode;; 11/11/87 Barry McCord; Corrected FORTRAN bug fix (06/24/87 above); by changing a JMP instruction in emexcept.asm.; Corrected DOS5only initialization in emdos.asm;; missing JMP caused CW not to be initialized.;; 11/12/87 Barry McCord; Added OS/2 support for a reentrant/dynalinkable; run-time (IBM/Dallas model). Used DOSALLOCSEG; to allocate per-thread emulator data areas. The; segment selectors are stored in an array and indexed; by thread ID.;; 12/08/87 Greg Whitten; put new exception handling code under POLLING switch;; 01/11/88 Barry McCord; eliminated assembler error in i386 version; of emfrndi.asm;; 01/21/88 Barry McCord; replaced QB4 switch with _NOSTKEXCHLR, since; QB4 updates no longer use the switch;; 03/16/89 WAJ; Fixed bug in emt.lib/87t.lib. __fpsignal was being; called with the wrong value.;; 03/24/89 WAJ; Fixed bug in emmt.lib/87mt.lib. In emerror.asm, the; address of user's FP signal handler was not being; removed from stack.;; 03/26/89 WAJ; Added ifdefs for the SMALL_EMULATOR for BASIC;; 04/02/89 WAJ; Added special emmtsql version that will let SQL; switch stacks with emmt.lib.;; 04/06/89 WAJ; Updated win87em.exe;; 04/07/89 WAJ; Moved history from emulator.asm into emulator.hst; Moved some macros into emulator.inc;;; 04/09/89 WAJ; Added standard header file to most of the emulator files.; Added ProfBegin and ProfEnd macros for profiling.;; 04/10/89 WAJ; Added code to emerror.asm and emfixfly.asm to handle EMS; segments in ds under Windows when calling the user's floating; point excpetion handler.;; 04/12/89 WAJ Added NOPs to ProfBegin and ProfEnd;; 04/12/89 WAJ Polling emulator now uses a "retf 2" instead of "iret";; 04/27/89 WAJ Made several changes to Windows emulator to support; protected Win386. Removed all writes into code segments.;; 04/28/89 WAJ Added RESIDENTNAME to win87em.def.;; 04/30/89 WAJ Added several "even" statements to emarith.asm;; 05/02/89 WAJ Added instruction look ahead and several minor spead ups.;; 05/12/89 WAJ Added sti to "retf 2" in Windows emulator.;; 05/16/89 WAJ Fixed bug in look ahead code (emmain.asm). Segment override; followed by bp address would use the wrong segment.;; 05/39/89 WAJ Now includes cmacros.inc. Just used for segments at the; moment.;; 05/39/89 WAJ Added emqp.lib for Quick Pascal to build.;; 06/05/89 WAJ Fixed bug in BIGNAN (in emarith.asm). Wasn't returning; NAN with biggest mantissa.;; 06/06/89 WAJ "fldz" was not giving the same results as "fld [zero]";; 06/12/89 WAJ Changed AllExceptionsHandled in emexcept.asm so that user; can mask invalid exceptions.;; 06/20/89 WAJ win87em.exe is now marked as a Windows 3.0 exe.; win87em2.exe is the Windows 2.0 version. win87em.def is; now used just to make the win87em.lib implib.;; 06/02/89 WAJ win87em.exe's version number is now 6.00.03;; 06/28/89 WAJ Added save/restore to emwin.asm for win87em.exe. Also,; added the file win87em.h.;; 07/05/89 WAJ Removed fixup externals from QuickPascal emulator.;; 07/18/89 WAJ Added __fpemulatorbegin and __fpemulatorend labels.;; 08/01/89 WAJ Added check for reg, reg operation to ProcessDenormal in; emexcept.asm;; 09/06/89 WAJ Fixed bug in emfmul.asm. Needed "xor ebp, ebp" after PROD2.;; 09/21/89 WAJ Started merging in 386 version.;; 01/22/90 WAJ win87em.dll now check __WINFLAGS to remove STI if pmode.; 01/22/90 WAJ win87em.dll version numbers is incremented to 6.00.04.;; 02/02/90 WAJ Changed "retf 2" in win87em.dll into iret.; 02/02/90 WAJ win87em.dll version numbers is incremented to 6.00.05.;; 02/02/90 WAJ In win87em.dll, skips sti if WF_PMODE and WF_WIN386.; 02/02/90 WAJ win87em.dll version numbers is incremented to 6.00.06.; 04/06/90 WAJ Fixed win87em.dll exception problems. Version 6.00.07.; 04/10/90 WAJ Added fsetpm to init. Added "out f0, 0". Version 6.00.08.; 04/11/90 WAJ Win exception handler could set ES=0. Added NUL_JMP.; Version 6.00.09.; 04/12/90 WAJ Win87em.dll now inits chip for each app. Now uses INT 11h.; Version 6.00.10; 04/17/90 WAJ Win87em.dll now uses protexception for 286/287 PS/2'ss.; Version 6.00.11; 05/14/92 JWM Added DonC's WINFAST code; changes to emulator.asm, emerror.asm; emfixfly.asm, emwin.asm; also added fwait to "reset" in; emwin.asm, to fix 80387 bug.;;*******************************************************************************
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