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