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328 lines
10 KiB
Plaintext
328 lines
10 KiB
Plaintext
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; File: XStore.a
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;
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; Contains: Routines to store operands to memory or registers
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;
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; Originally Written by: Motorola Inc.
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; Adapted to Apple/MPW: Jon Okada
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;
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; Copyright: © 1990, 1991 by Apple Computer, Inc., all rights reserved.
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;
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; This file is used in these builds: Mac32
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;
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; Change History (most recent first):
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;
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; <2> 3/30/91 BG Rolling in Jon Okada's latest changes.
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; <1> 12/14/90 BG First checked into TERROR/BBS.
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; xstore.a
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; Based upon Motorola file 'x_store.sa'.
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; CHANGE LOG:
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; 09 Jan 91 JPO Deleted unreferenced label "E3_sto". Renamed labels
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; "opc011" and "sinf" to "stopc011" and "stsinf",
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; respectively. Replaced "bsr mem_write" with in-line
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; code in subroutines 'dest_dbl', 'dest_sgl', and
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; 'dest_ext'. Replaced "bsr get_fline" with in_line
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; code in subroutine 'dest_sgl'.
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; 24 Jan 91 JPO Corrected code to store result if destination is FP2
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; or FP3 (see routine 'sto_fp' below).
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; 18 Feb 91 JPO Modified routine 'sto_fp' to normalize unnormalized
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; results prior to storing in dst FP register.
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;
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*
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* x_store.sa 3.1 12/10/90
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*
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* store --- store operand to memory or register
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*
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* Used by underflow and overflow handlers.
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*
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* a0 = points to fp value to be stored.
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*
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* Copyright (C) Motorola, Inc. 1990
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* All Rights Reserved
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*
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* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
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* The copyright notice above does not evidence any
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* actual or intended publication of such source code.
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* X_STORE IDNT 2,1 Motorola 040 Floating Point Software Package
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fpreg_mask:
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dc.b $80,$40,$20,$10,$08,$04,$02,$01
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store:
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btst.b #E3,E_BYTE(a6)
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beq E1_sto
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;E3_sto: ; label DELETED <1/9/91, JPO>
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move.l CMDREG3B(a6),d0
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bfextu d0{6:3},d0 ;isolate dest. reg from cmdreg3b
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;
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; First normalize any unnormalized result; lack of normalization is due
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; to underflow for single- or double-precision rounding, so result is
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; guaranteed to be zero or normal to extended precision.
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;
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sto_fp:
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move.w LOCAL_EX(a0),d1 ; isolate exponent <2/18/91, JPO>
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andi.w #$7fff,d1 ; <2/18/91, JPO>
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beq.b @2 ; zero exponent <2/18/91, JPO>
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cmpi.w #$7fff,d1 ; <2/18/91, JPO>
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beq.b @2 ; infinity <2/18/91, JPO>
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tst.l LOCAL_HI(a0) ; test high mantissa <2/18/91, JPO>
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bmi.b @2 ; normal <2/18/91, JPO>
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bne.b @1 ; unnormalized <2/18/91, JPO>
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tst.l LOCAL_LO(a0) ; test low mantissa <2/18/91, JPO>
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bne.b @1 ; unnormalized <2/18/91, JPO>
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clr.w LOCAL_EX(a0) ; zero result. zero exponent <2/18/91, JPO>
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bra.b @2 ; <2/18/91, JPO>
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@1: ; label ADDED <2/18/91, JPO>
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move.l d0,-(sp) ; save d0 <2/18/91, JPO>
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bsr.w nrm_set ; normalize <2/18/91, JPO>
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move.l (sp)+,d0 ; restore d0 <2/18/91, JPO>
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@2: ; label ADDED <2/18/91, JPO>
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lea fpreg_mask,a1
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move.b (a1,d0.w),d0 ;convert reg# to dynamic register mask
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tst.b LOCAL_SGN(a0)
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beq.b is_pos
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bset.b #sign_bit,LOCAL_EX(a0)
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is_pos:
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fmovem.x (a0),d0 ;move to correct register
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*
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* if fp0-fp3 is being modified, we must put a copy
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* in the USER_FPn variable on the stack because all exception
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* handlers restore fp0-fp3 from there.
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*
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cmp.b #$80,d0
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bne.b not_fp0
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fmovem.x fp0,USER_FP0(a6)
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rts
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not_fp0:
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cmp.b #$40,d0
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bne.b not_fp1
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fmovem.x fp1,USER_FP1(a6)
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rts
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not_fp1:
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cmp.b #$20,d0
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bne.b not_fp2
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; fmovem.x fp1,USER_FP2(a6) ; DELETED <1/24/91, JPO>
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fmovem.x fp2,USER_FP2(a6) ; copy fp2 to stack storage <1/24/91, JPO>
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rts
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not_fp2:
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cmp.b #$10,d0
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bne.b not_fp3
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; fmovem.x fp1,USER_FP3(a6) ; DELETED <1/24/91, JPO>
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fmovem.x fp3,USER_FP3(a6) ; copy fp3 to stack storage <1/24/91, JPO>
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rts
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not_fp3:
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rts
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E1_sto:
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bsr g_opcls ;returns opclass in d0
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cmpi.b #3,d0
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beq.b stopc011 ;branch if opclass 3 - label renamed <1/9/91, JPO>
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move.l CMDREG1B(a6),d0
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bfextu d0{6:3},d0 ;extract destination register
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bra sto_fp
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stopc011: ; label renamed <1/9/91, JPO>
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bsr g_dfmtou ;returns dest format in d0
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* ;ext=00, sgl=01, dbl=10
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move.l a0,a1 ;save source addr in a1
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move.l EXC_EA(a6),a0 ;get the address
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; cmpi.l #0,d0 ;if dest format is extended - DELETED <1/9/91, JPO>
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tst.l d0 ; replaces "cmpi.l #0,d0" <1/9/91, JPO>
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beq.w dest_ext ;then branch
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cmpi.l #1,d0 ;if dest format is single
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beq.b dest_sgl ;then branch
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*
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* fall through to dest_dbl
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*
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*
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* dest_dbl --- write double precision value to user space
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*
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*Input
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* a0 -> destination address
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* a1 -> source in extended precision
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*Output
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* a0 -> destroyed
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* a1 -> destroyed
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* d0 -> 0
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*
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*Changes extended precision to double precision.
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* Note: no attempt is made to round the extended value to double.
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* dbl_sign = ext_sign
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* dbl_exp = ext_exp - $3fff(ext bias) + $7ff(dbl bias)
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* get rid of ext integer bit
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* dbl_mant = ext_mant{62:12}
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*
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* --------------- --------------- ---------------
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* extended -> |s| exp | |1| ms mant | | ls mant |
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* --------------- --------------- ---------------
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* 95 64 63 62 32 31 11 0
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* | |
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* | |
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* | |
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* v v
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* --------------- ---------------
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* double -> |s|exp| mant | | mant |
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* --------------- ---------------
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* 63 51 32 31 0
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*
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dest_dbl:
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clr.l d0 ;clear d0
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move.w LOCAL_EX(a1),d0 ;get exponent
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sub.w #$3fff,d0 ;subtract extended precision bias
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cmp.w #$4000,d0 ;check if inf
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beq.b inf ;if so, special case
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add.w #$3ff,d0 ;add double precision bias
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swap d0 ;d0 now in upper word
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lsl.l #4,d0 ;d0 now in proper place for dbl prec exp
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tst.b LOCAL_SGN(a1)
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beq.b get_mant ;if postive, go process mantissa
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bset.l #31,d0 ;if negative, put in sign information
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* ; before continuing
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bra.b get_mant ;go process mantissa
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inf:
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move.l #$7ff00000,d0 ;load dbl inf exponent
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clr.l LOCAL_HI(a1) ;clear msb
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tst.b LOCAL_SGN(a1)
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beq.b dbl_inf ;if positive, go ahead and write it
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bset.l #31,d0 ;if negative put in sign information
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dbl_inf:
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move.l d0,LOCAL_EX(a1) ;put the new exp back on the stack
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bra.b dbl_wrt
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get_mant:
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move.l LOCAL_HI(a1),d1 ;get ms mantissa
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bfextu d1{1:20},d1 ;get upper 20 bits of ms
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or.l d1,d0 ;put these bits in ms word of double
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move.l d0,LOCAL_EX(a1) ;put the new exp back on the stack
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move.l LOCAL_HI(a1),d1 ;get ms mantissa
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move.l #21,d0 ;load shift count
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lsl.l d0,d1 ;put lower 11 bits in upper bits
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move.l d1,LOCAL_HI(a1) ;build lower lword in memory
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move.l LOCAL_LO(a1),d1 ;get ls mantissa
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bfextu d1{0:21},d0 ;get ls 21 bits of double
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or.l d0,LOCAL_HI(a1) ;put them in double result
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dbl_wrt:
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; move.l #$8,d0 ;byte count for double precision number - DELETED <1/9/91, JPO>
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; exg a0,a1 ;a0=supervisor source, a1=user dest - DELETED <1/9/91, JPO>
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; bsr.l mem_write ;move the number to the user's memory - DELETED <1/9/91, JPO>
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move.l (a1)+,(a0)+ ; move d.p. number to user memory <1/9/91, JPO>
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move.l (a1),(a0) ; <1/9/91, JPO>
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rts
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*
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* dest_sgl --- write single precision value to user space
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*
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*Input
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* a0 -> destination address
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* a1 -> source in extended precision
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*
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*Output
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* a0 -> destroyed
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* a1 -> destroyed
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* d0 -> 0
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*
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*Changes extended precision to single precision.
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* sgl_sign = ext_sign
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* sgl_exp = ext_exp - $3fff(ext bias) + $7f(sgl bias)
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* get rid of ext integer bit
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* sgl_mant = ext_mant{62:12}
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*
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* --------------- --------------- ---------------
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* extended -> |s| exp | |1| ms mant | | ls mant |
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* --------------- --------------- ---------------
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* 95 64 63 62 40 32 31 12 0
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* | |
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* | |
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* | |
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* v v
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* ---------------
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* single -> |s|exp| mant |
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* ---------------
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* 31 22 0
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*
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dest_sgl:
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clr.l d0
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move.w LOCAL_EX(a1),d0 ;get exponent
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sub.w #$3fff,d0 ;subtract extended precision bias
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cmp.w #$4000,d0 ;check if inf
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beq.b stsinf ;if so, special case - label renamed <1/9/91, JPO>
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add.w #$7f,d0 ;add single precision bias
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swap d0 ;put exp in upper word of d0
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lsl.l #7,d0 ;shift it into single exp bits
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tst.b LOCAL_SGN(a1)
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beq.b get_sman ;if positive, continue
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bset.l #31,d0 ;if negative, put in sign first
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bra.b get_sman ;get mantissa
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stsinf: ; label renamed <1/9/91, JPO>
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move.l #$7f800000,d0 ;load single inf exp to d0
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tst.b LOCAL_SGN(a1)
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beq.b sgl_wrt ;if positive, continue
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bset.l #31,d0 ;if negative, put in sign info
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bra.b sgl_wrt
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get_sman:
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move.l LOCAL_HI(a1),d1 ;get ms mantissa
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bfextu d1{1:23},d1 ;get upper 23 bits of ms
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or.l d1,d0 ;put these bits in ms word of single
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sgl_wrt:
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move.l d0,L_SCR1(a6) ;put the new exp back on the stack
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move.l #$4,d0 ;byte count for single precision number
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tst.l a0 ;users destination address
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beq.b sgl_Dn ;destination is a data register
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; exg a0,a1 ;a0=supervisor source, a1=user dest - DELETED <1/9/91, JPO>
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; lea.l L_SCR1(a6),a0 ;point a0 to data - DELETED <1/9/91, JPO>
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; bsr.l mem_write ;move the number to the user's memory - DELETED <1/9/91, JPO>
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lea.l L_SCR1(a6),a1 ; point a1 to data <1/9/91, JPO>
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move.l (a1),(a0) ; move the number to user memory <1/9/91, JPO>
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rts
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sgl_Dn:
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; bsr.l get_fline ;returns fline word in d0 - DELETED <1/9/91, JPO>
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; and.w #$7,d0 ;isolate register number - DELETED <1/9/91, JPO>
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; move.l d0,d1 ;d1 has size:reg formatted for reg_dest - DELETED <1/9/91, JPO>
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; or.l #$10,d1 ;reg_dest wants size added to reg# - DELETED <1/9/91, JPO>
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move.l USER_FPIAR(a6),a0 ; read opcode into d1.w <1/9/91, JPO>
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sub.l d1,d1 ; with d1 high word cleared <1/9/91, JPO>
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move.w (a0),d1 ; <1/9/91, JPO>
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and.w #7,d1 ; isolate register number <1/9/91, JPO>
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or.b #$10,d1 ; set size to 32 bits <1/9/91, JPO>
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bra reg_dest ;size is X, rts in reg_dest will
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* ;return to caller of dest_sgl
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dest_ext:
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tst.b LOCAL_SGN(a1) ;put back sign into exponent word
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beq.b dstx_cont
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bset.b #sign_bit,LOCAL_EX(a1)
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dstx_cont:
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clr.b LOCAL_SGN(a1) ;clear out the sign byte
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; move.l #$0c,d0 ;byte count for extended number - DELETED <1/9/91, JPO>
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; exg a0,a1 ;a0=supervisor source, a1=user dest - DELETED <1/9/91, JPO>
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; bsr.l mem_write ;move the number to the user's memory - DELETED <1/9/91, JPO>
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move.l (a1)+,(a0)+ ; move the number to user's memory <1/9/91, JPO>
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move.l (a1)+,(a0)+
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move.l (a1),(a0)
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rts
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