285 lines
5.7 KiB
NASM
285 lines
5.7 KiB
NASM
|
page ,132
|
||
|
|
subttl emlsint.asm - Load/Store 16/32-bit integers
|
||
|
|
;***
|
||
|
|
;emlsint.asm - Load/Store 16/32-bit integers
|
||
|
|
;
|
||
|
|
; Copyright (c) 1986-89, Microsoft Corporation
|
||
|
|
;
|
||
|
|
;Purpose:
|
||
|
|
; Load/Store 16/32-bit integers
|
||
|
|
;
|
||
|
|
; This Module contains Proprietary Information of Microsoft
|
||
|
|
; Corporation and should be treated as Confidential.
|
||
|
|
;
|
||
|
|
;Revision History:
|
||
|
|
; See emulator.hst
|
||
|
|
;
|
||
|
|
;*******************************************************************************
|
||
|
|
|
||
|
|
|
||
|
|
;*********************************************************************;
|
||
|
|
; ;
|
||
|
|
; Load Single (16 Bit) Integer ;
|
||
|
|
; ;
|
||
|
|
;*********************************************************************;
|
||
|
|
|
||
|
|
; ES:SI: memory address of 16 bit integer
|
||
|
|
|
||
|
|
ProfBegin LSINT
|
||
|
|
|
||
|
|
|
||
|
|
pub eFLDsi
|
||
|
|
LDUS2AX ; Fetch the integer
|
||
|
|
MOV DI,AX ; into DI:BP:BX:DX
|
||
|
|
OR DI,DI
|
||
|
|
JZ short LoadZero
|
||
|
|
XOR BP,BP
|
||
|
|
MOV BX,BP
|
||
|
|
MOV DX,BX
|
||
|
|
|
||
|
|
MOV AX,15 ; Exponent would be 15 if no shifts needed
|
||
|
|
PUSHST ; Get a new TOS
|
||
|
|
XOR CL,CL
|
||
|
|
MOV Tag[esi],CL ; Tag number as valid non-zero
|
||
|
|
MOV CX,DI ; Sign of Integer to CH
|
||
|
|
AND CH,Sign
|
||
|
|
if fastSP
|
||
|
|
OR CH,Single
|
||
|
|
endif
|
||
|
|
JNS short SETFLAG16 ; If positive integer set the flag
|
||
|
|
|
||
|
|
NEG DI ; Otherwise compliment the number first
|
||
|
|
|
||
|
|
pub SETFLAG16
|
||
|
|
MOV Flag[esi],CH
|
||
|
|
JMP IntegerToInternal
|
||
|
|
|
||
|
|
pub LoadZero
|
||
|
|
PUSHST ; Get a new TOS
|
||
|
|
XOR AX,AX
|
||
|
|
MOV MB0[esi],AX
|
||
|
|
MOV MB2[esi],AX
|
||
|
|
MOV MB4[esi],AX
|
||
|
|
MOV MB6[esi],AX
|
||
|
|
MOV Expon[esi],IexpMin - IexpBias
|
||
|
|
MOV Flag[esi],AH
|
||
|
|
MOV AH,ZROorINF
|
||
|
|
MOV Tag[esi],AH
|
||
|
|
RET
|
||
|
|
PAGE
|
||
|
|
;*********************************************************************;
|
||
|
|
; ;
|
||
|
|
; Store Single (16 Bit) Integer ;
|
||
|
|
; ;
|
||
|
|
;*********************************************************************;
|
||
|
|
;
|
||
|
|
; ES:SI: memory address of 16 bit integer
|
||
|
|
|
||
|
|
pub eFSTsi
|
||
|
|
PUSH esi ; Save memory address for store
|
||
|
|
MOV esi,[CURstk]
|
||
|
|
; Test for special conditions
|
||
|
|
TEST byte ptr Tag[esi],Special ; If number is not in range it is overflow
|
||
|
|
JNZ short IntegerOverflow16
|
||
|
|
TEST byte ptr Tag[esi],ZROorINF
|
||
|
|
JNZ short StoreIntegerZero16
|
||
|
|
; Fetch Exponent & test fo blatent overflow
|
||
|
|
MOV CX,Expon[esi]
|
||
|
|
CMP CX,15
|
||
|
|
JG short IntegerOverflow16
|
||
|
|
|
||
|
|
if fastSP
|
||
|
|
MOV BX,MB4[esi] ; Fetch mantissa to DI:BP:BX:DX
|
||
|
|
MOV DI,MB6[esi]
|
||
|
|
TEST byte ptr Flag[esi],Single
|
||
|
|
JZ SSID
|
||
|
|
XOR BL,BL
|
||
|
|
MOV BP,BX
|
||
|
|
XOR BX,BX
|
||
|
|
MOV DX,BX
|
||
|
|
SSI:
|
||
|
|
else
|
||
|
|
MOV BP,MB4[esi] ; Fetch mantissa to DI:BP:BX:DX
|
||
|
|
MOV DI,MB6[esi]
|
||
|
|
MOV DX,MB0[esi]
|
||
|
|
MOV BX,MB2[esi]
|
||
|
|
endif
|
||
|
|
CALL InternalToInteger
|
||
|
|
; Integer now in BX:DX (not yet 2's compliment)
|
||
|
|
OR BX,BX ; Test again for Overflow
|
||
|
|
JNZ short IntegerOverflow16
|
||
|
|
MOV AH,Flag[esi] ; See if we need to compliment
|
||
|
|
OR AH,AH
|
||
|
|
JNS short Int16in2sComp
|
||
|
|
|
||
|
|
NEG DX
|
||
|
|
JZ short Store16 ; Special case 0
|
||
|
|
|
||
|
|
pub Int16in2sComp
|
||
|
|
XOR AX,DX ; If Signs agree we did not overflow
|
||
|
|
JS short IntegerOverflow16
|
||
|
|
|
||
|
|
pub Store16
|
||
|
|
POP edi ; Restore Memory address
|
||
|
|
MOV AX,DX
|
||
|
|
STAX2US
|
||
|
|
RET
|
||
|
|
|
||
|
|
if fastSP
|
||
|
|
SSID:
|
||
|
|
MOV BP,BX
|
||
|
|
MOV DX,MB0[esi]
|
||
|
|
MOV BX,MB2[esi]
|
||
|
|
JMP SSI
|
||
|
|
endif
|
||
|
|
|
||
|
|
pub StoreIntegerZero16
|
||
|
|
XOR DX,DX
|
||
|
|
JMP Store16
|
||
|
|
|
||
|
|
pub IntegerOverflow16
|
||
|
|
OR [CURerr],Invalid
|
||
|
|
MOV DX,8000H ; Integer Indefinite
|
||
|
|
JMP Store16
|
||
|
|
|
||
|
|
page
|
||
|
|
;*********************************************************************;
|
||
|
|
; ;
|
||
|
|
; Load Double (32 Bit) Integer ;
|
||
|
|
; ;
|
||
|
|
;*********************************************************************;
|
||
|
|
;
|
||
|
|
; ES:SI: memory address of 32 bit integer
|
||
|
|
|
||
|
|
pub eFLDdi
|
||
|
|
LDUS2AX ; Fetch the integer
|
||
|
|
MOV BP,AX ; into DI:BP:BX:DX
|
||
|
|
LDUS2AX
|
||
|
|
MOV DI,AX
|
||
|
|
|
||
|
|
OR AX,BP
|
||
|
|
JZ short JMPLoadZeroBecauseThisLanguageHasNoFarConditionalJump
|
||
|
|
XOR BX,BX
|
||
|
|
MOV DX,BX
|
||
|
|
|
||
|
|
MOV AX,31 ; Exponent would be 31 if no shifts needed
|
||
|
|
PUSHST ; Get a new TOS
|
||
|
|
XOR CL,CL
|
||
|
|
MOV Tag[esi],CL ; Tag number as valid non-zero
|
||
|
|
MOV CX,DI ; Sign of Integer to CH
|
||
|
|
AND CH,Sign
|
||
|
|
JNS short SETFLAG32 ; If positive integer set the flag
|
||
|
|
|
||
|
|
XOR DI,0FFFFH ; Otherwise compliment the number first
|
||
|
|
XOR BP,0FFFFH
|
||
|
|
ADD BP,1
|
||
|
|
ADC DI,0
|
||
|
|
|
||
|
|
pub SETFLAG32
|
||
|
|
MOV Flag[esi],CH
|
||
|
|
OR DI,DI
|
||
|
|
JZ short SPEEDSHIFT32
|
||
|
|
JMP IntegerToInternal
|
||
|
|
|
||
|
|
JMPLoadZeroBecauseThisLanguageHasNoFarConditionalJump:
|
||
|
|
JMP LoadZero
|
||
|
|
|
||
|
|
pub SPEEDSHIFT32
|
||
|
|
MOV DI,BP
|
||
|
|
XOR BP,BP
|
||
|
|
SUB AX,16
|
||
|
|
JMP IntegerToInternal
|
||
|
|
|
||
|
|
page
|
||
|
|
;*********************************************************************;
|
||
|
|
; ;
|
||
|
|
; Store Double (32 Bit) Integer ;
|
||
|
|
; ;
|
||
|
|
;*********************************************************************;
|
||
|
|
;
|
||
|
|
; ES:SI: memory address of 32 bit integer
|
||
|
|
|
||
|
|
pub eFSTdi
|
||
|
|
PUSH esi
|
||
|
|
call TOSto32int ; convert TOS to 32-bit integer
|
||
|
|
POP edi ; Restore Memory address
|
||
|
|
MOV AX,DX
|
||
|
|
STAX2US
|
||
|
|
MOV AX,BX
|
||
|
|
STAX2US
|
||
|
|
RET
|
||
|
|
|
||
|
|
|
||
|
|
pub TOSto32int
|
||
|
|
MOV esi,[CURstk]
|
||
|
|
; Test for special conditions
|
||
|
|
TEST byte ptr Tag[esi],Special ; If number is not in range it is overflow
|
||
|
|
JNZ short IntegerOverflow32
|
||
|
|
TEST byte ptr Tag[esi],ZROorINF
|
||
|
|
JNZ short StoreIntegerZero32
|
||
|
|
; Fetch Exponent & test fo blatent overflow
|
||
|
|
MOV CX,Expon[esi]
|
||
|
|
CMP CX,31
|
||
|
|
JG short IntegerOverflow32
|
||
|
|
|
||
|
|
if fastSP
|
||
|
|
MOV BX,MB4[esi] ; Fetch mantissa to DI:BP:BX:DX
|
||
|
|
MOV DI,MB6[esi]
|
||
|
|
TEST byte ptr Flag[esi],Single
|
||
|
|
JZ SDID
|
||
|
|
XOR BL,BL
|
||
|
|
MOV BP,BX
|
||
|
|
XOR BX,BX
|
||
|
|
MOV DX,BX
|
||
|
|
SDI:
|
||
|
|
else
|
||
|
|
MOV BP,MB4[esi] ; Fetch mantissa to DI:BP:BX:DX
|
||
|
|
MOV DI,MB6[esi]
|
||
|
|
MOV DX,MB0[esi]
|
||
|
|
MOV BX,MB2[esi]
|
||
|
|
endif
|
||
|
|
CALL InternalToInteger
|
||
|
|
; Integer in BP:BX:DX (not yet 2's compliment)
|
||
|
|
OR BP,BP ; Test again for Overflow
|
||
|
|
JNZ short IntegerOverflow32
|
||
|
|
MOV AH,Flag[esi] ; See if we need to compliment
|
||
|
|
OR AH,AH
|
||
|
|
JNS short Int32in2sComp
|
||
|
|
|
||
|
|
XOR BX,0FFFFH ; 2's Compliment of BX:DX
|
||
|
|
XOR DX,0FFFFH
|
||
|
|
ADD DX,1
|
||
|
|
ADC BX,0
|
||
|
|
|
||
|
|
pub Int32in2sComp
|
||
|
|
XOR AX,BX ; If Signs agree we did not overflow
|
||
|
|
JS short IntOverOrZero32 ; Special case is -0 which we let pass
|
||
|
|
|
||
|
|
pub Store32
|
||
|
|
ret
|
||
|
|
|
||
|
|
if fastSP
|
||
|
|
SDID:
|
||
|
|
MOV BP,BX
|
||
|
|
MOV DX,MB0[esi]
|
||
|
|
MOV BX,MB2[esi]
|
||
|
|
JMP SDI
|
||
|
|
endif
|
||
|
|
|
||
|
|
pub StoreIntegerZero32
|
||
|
|
XOR DX,DX
|
||
|
|
MOV BX,DX
|
||
|
|
ret
|
||
|
|
|
||
|
|
pub IntOverOrZero32
|
||
|
|
OR BX,DX
|
||
|
|
JZ Store32
|
||
|
|
|
||
|
|
pub IntegerOverflow32
|
||
|
|
OR CURerr,Invalid
|
||
|
|
MOV BX,8000H ; Integer Indefinite
|
||
|
|
XOR DX,DX
|
||
|
|
ret
|
||
|
|
|
||
|
|
ProfEnd LSINT
|