330 lines
16 KiB
NASM
330 lines
16 KiB
NASM
;*****************************************************************************
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;*
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;* Open Watcom Project
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;*
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;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;* ========================================================================
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;*
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;* This file contains Original Code and/or Modifications of Original
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;* Code as defined in and that are subject to the Sybase Open Watcom
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;* Public License version 1.0 (the 'License'). You may not use this file
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;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;* provided with the Original Code and Modifications, and is also
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;* available at www.sybase.com/developer/opensource.
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;*
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;* The Original Code and all software distributed under the License are
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;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;* NON-INFRINGEMENT. Please see the License for the specific language
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;* governing rights and limitations under the License.
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;*
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;* ========================================================================
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;*
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;* Description: 80x87 interrupt handler.
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;*
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;*****************************************************************************
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;;; //e:\watcom\src\bld\watcom\h;E:\WATCOM\H;E:\WATCOM\H\NT
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.8087
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.386p
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include struct.inc
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include mdef.inc
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include stword.inc
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include env387.inc
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include fstatus.inc
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xref __8087 ; indicate that NDP instructions are present
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modstart fpeinth
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datasegment
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extrn __FPE_exception_: proc
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extrn "C",_STACKLOW : dword
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TInf db 00h,00h,00h,00h,00h,00h,00h,80h,0ffh,7fh
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F8Inf db 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0efh,7fh
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F4Inf db 0ffh,0ffh,7fh,7fh
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enddata
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; User handler for 80x87 exceptions.
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xdefp __FPEHandler_
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defp __FPEHandler_
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public __FPE2Handler_
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__FPE2Handler_ label byte
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push EAX ; save regs
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push EBX ; ...
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push ECX ; ...
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push EDX ; ...
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push ESI ; ...
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push EDI ; ...
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push EBP ; ...
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sub ESP,ENV_SIZE ; make room for environment information
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mov EBP,ESP ; point to buffer for 80x87 environment
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fnstenv [EBP] ; get 80x87 environment
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fwait ; wait for 80x87
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mov EDX,ENV_CW[EBP] ; get control word
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not EDX ; flip the mask bits
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mov DH,0FFh ; turn on top byte
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and EDX,ENV_SW[EBP] ; get status word
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mov EDI,ENV_IP[EBP] ; ...
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opcode:
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mov BX,[EDI] ; get opcode
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inc EDI ; point to next opcode
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cmp BL,0d8h ; check if its the opcode
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jb opcode ; ...
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cmp BL,0dfh ; ...
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ja opcode ; ...
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mov EDI,ENV_OP[EBP] ; ...
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xchg BL,BH ; get opcode in right position
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mov CL,FPE_OK ; assume exception to be ignored
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_guess ; guess precision exception
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test DL,ST_EF_PR ; - check for precision exception
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_quif e ; - quit if not precision exception
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mov CL,FPE_INEXACT ; - indicate precision exception
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_admit ; guess stack under/overflow
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test DL,ST_EF_SF ; - check for stack under/overflow
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_quif e ; - quit if not stack under/overflow
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test DX,ST_C1 ; - check if underflow
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_if e ; - if underflow
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mov CL,FPE_STACKUNDERFLOW ; - - indicate stack underflow
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_else ; - else
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mov CL,FPE_STACKOVERFLOW ; - - indicate stack overflow
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_endif ; - endif
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_admit ; guess invalid operation
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test DL,ST_EF_IO ; - check for invalid operation
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_quif e ; - quit if not invalid operation
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call InvalidOp ; - process invalid operation
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_admit ; guess denormal operand
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test DL,ST_EF_DO ; - check for denormal operand
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_quif e ; - quit if not denormal operand
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mov CL,FPE_DENORMAL ; - indicate underflow
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_admit ; guess overflow
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test DL,ST_EF_OF ; - check for overflow
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_quif e ; - quit if not overflow
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call KOOverFlow ; - process overflow exception
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mov CL,FPE_OVERFLOW ; - set floating point error code
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_admit ; guess underflow
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test DL,ST_EF_UF ; - check for underflow
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_quif e ; - quit if not underflow
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mov CL,FPE_UNDERFLOW ; - indicate underflow
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_admit ; guess divide by 0
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test DL,ST_EF_ZD ; - check for divide by zero
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_quif e ; - quit if not divide by zero
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call GetInf ; - process divide by zero
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mov CL,FPE_ZERODIVIDE ; - indicate divide by zero
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_endguess ; endguess
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_guess ; guess exception to be handled
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cmp CL,FPE_OK ; - check if exception allowed
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_quif e ; - quit if exception not allowed
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movzx EAX,CL ; - set floating point status
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call __FPE_exception_ ; - call user's handler
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_endguess ; endguess
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fclex ; clear exceptions that may have
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; occurred as a result of handling the
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; exception
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and word ptr ENV_CW[EBP],0FF72h
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fldcw word ptr ENV_CW[EBP] ; enable interrupts
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fwait ; ...
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add ESP,ENV_SIZE ; clean up stack
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pop EBP ; ...
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pop EDI ; ...
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pop ESI ; ...
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pop EDX ; ...
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pop ECX ; ...
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pop EBX ; ...
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pop EAX ; ...
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ret ; return from interrupt handler
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endproc __FPEHandler_
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; Process invalid operation.
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InvalidOp proc near
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mov CL,FPE_INVALID ; assume invalid operation
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_guess ; guess it's square root
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cmp BX,0D9FAh ; - ...
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_quif ne ; - quit if it's not that instruction
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mov CL,FPE_SQRTNEG ; - indicate sqrt(negative number)
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ret ; - return
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_endguess ; endguess
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_guess ; guess it's square root
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cmp BX,0D9F1h ; - ...
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_quif ne ; - quit if it's not that instruction
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mov CL,FPE_LOGERR ; - indicate sqrt(negative number)
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ret ; - return
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_endguess ; endguess
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_guess ; guess: 'fprem' instruction
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cmp BX,0D9F8h ; - check for 'fprem' 10-may-90
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_if ne ; - if not 'fprem'
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cmp BX,0D9F5h ; - - check for 'fprem1'
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_endif ; - endif
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_quif ne ; - quit if not 'fprem' or 'fprem1'
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mov CL,FPE_MODERR ; - indicate mod(negative number)
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_admit ; guess: integer overflow
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mov DX,BX ; - save op code
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and DX,0310h ; - check for fist/fistp instruction
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cmp DX,0310h ; - ...
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_quif ne ; - quit if its not that instruction
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mov CL,FPE_IOVERFLOW ; - indicate integer overflow
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_admit ; guess it's floating point underflow
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;; mov DX,BX ; - save op code
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and DX,0110h ; - check if fst or fstp instruction
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cmp DX,0110h ; - ...
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_quif ne ; - quit if it's not that instruction
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; Destination is short or long real and source register is an unnormal
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; with exponent in range.
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fstp st(0) ; - pop old result
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fldz ; - load zero
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mov DL,BL ; - save op code
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and DL,0C0h ; - check the MOD bits of instruction
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cmp DL,0C0h ; - ...
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_if ne ; - if result to be placed in memory
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call Store ; - - store result in memory
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_endif ; - endif
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test BL,08h ; - check if result to be popped
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_if ne ; - if result to be popped
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fstp st(0) ; - - pop the result
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_endif ; - endif
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mov CL,FPE_UNDERFLOW ; - indicate underflow
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_admit ; guess it's divide
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mov DX,BX ; - save op code
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and DX,0130h ; - check for fdiv/fidiv instruction
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cmp DX,0030h ; - ...
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_quif ne ; - quit if it's not that instruction
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mov DX,ENV_TW[EBP] ; - get tag word
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mov CL,AH ; - get stack pointer
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and CL,38h ; - ...
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shr CL,2 ; - ...
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ror DX,CL ; - make stack top low order bits
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and DL,05h ; - check if top two elements are 0
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cmp DL,05h ; - ...
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_quif ne ; - quif if they are not 0
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mov CL,FPE_ZERODIVIDE ; - indicate divide by zero
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_endguess ; endguess
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ret
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endproc InvalidOp
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; Process overflow exception (note that only floating point overflows
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; are handled - integer overflows are invalid operations).
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KOOverFlow proc near
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_guess ; guess: fscale instruction 10-may-90
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cmp BX,0D9FDh ; - quit if not 'fscale' instruction
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_quif ne ; - ...
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_admit ; guess: fst/fstp instruction
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mov DX,BX ; - save op code
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and DX,0110h ; - check if fst or fstp instruction
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cmp DX,0110h ; - ...
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_quif ne ; - quit if not an fst/fstp instr.
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call GetInf ; - load infinity
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mov DL,BL ; - save op code
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and DL,0C0h ; - check the MOD bits of instruction
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cmp DL,0C0h ; - ...
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_if ne ; - if result to be placed in memory
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call Store ; - - store infinity
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_endif ; - endif
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test BL,08h ; - check if result to be popped
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_if ne ; - if result to be popped
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fstp st(0) ; - - pop result
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_endif ; - endif
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_admit ; admit arithmetic operation
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mov DL,BL ; - save op code
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and DL,0C0h ; - check if both operands on stack
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cmp DL,0C0h ; - ...
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_quif ne ; - quif both operands not on stack
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;
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; This code handles overflow on the following intructions:
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; fxxx ST,ST(i)
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; fxxx ST(i),ST where xxx is one of mul,div,sub or add
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; fxxxp ST(i),ST
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;
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lea ESI,TInf ; - load internal infinity
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call Load ; - ...
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_admit ; admit
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;
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; This admit block is to handle overflow on the following intructions:
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; fxxx short real
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; fxxx long real where xxx is one of mul,div,sub or add
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;
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call GetInf ; - load infinity
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_endguess ; endguess
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ret ; return
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endproc KOOverFlow
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; Replace the top element of the stack with the appropriate signed
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; infinity.
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GetInf proc near
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ftst ; get sign of result
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fstsw word ptr ENV_OP[EBP]
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fstp st(0) ; pop argument off stack (does fwait)
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test BH,04h ; check if single or double
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_if ne ; if double
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fld qword ptr F8Inf ; - load double precision infinity
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_else ; else
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fld dword ptr F4Inf ; - load single precision infinity
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_endif ; endif
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test word ptr ENV_OP[EBP],ST_C0
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_if ne ; if argument is negative
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fchs ; - return negative infinity
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_endif ; endif
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ret ; return
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endproc GetInf
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; Replace an element on the stack with internal zero or infinity.
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Load proc near
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test BH,04h ; check if result is top element
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_if e ; if result is not top element
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mov DL,0 ; - indicate we are at the top
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_else ; else
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mov DL,BL ; - get st(i)
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and DL,07h ; - . . .
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_endif ; endif
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push EDX ; save st(i)
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_loop ; loop
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dec DL ; - decrement counter
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_quif l ; - quit if we are at st(i)
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fincstp ; - increment stack pointer
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_endloop ; endloop
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fstp st(0) ; free the stack element
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fld tbyte ptr [ESI] ; load internal zero
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pop EDX ; get st(i)
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_loop ; loop
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dec DL ; - decrement counter
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_quif l ; - quit if we are at st(i)
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fdecstp ; - decrement stack pointer
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_endloop ; endloop
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ret ; return
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endproc Load
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; Store the top element of the stack at ES:EDI.
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Store proc near
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test BH,04h
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_if ne ; if double
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fst qword ptr [EDI] ; - store as double precision result
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_else ; else
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fst dword ptr [EDI] ; - store as single precision result
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_endif ; endif
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ret ; return
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endproc Store
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endmod
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end
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