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137 lines
4.5 KiB
Plaintext
137 lines
4.5 KiB
Plaintext
;
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; File: XFLine.a
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;
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; Contains: Routines for handle F-Line traps in general
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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+> 6/24/91 BG Folded in Motorola version 2.0 fixes for handling FMOVECR
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; instructions with non-zero <ea> fields.
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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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; xfline.a
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; Based upon Motorola file 'x_fline.sa'.
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; CHANGE LOG:
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; 08 Jan 91 JPO Inserted label "fline" at top of code. Modified code
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; for branching to system fline handler. Streamlined
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; code for reading fline instruction. Renamed label
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; "ck_rev" to "flck_rev".
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; 13 Jun 91 JPO Folded in Motorola version 2.0 fixes for handling FMOVECR
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; instructions with non-zero <ea> fields.
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;
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*
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* x_fline.sa 3.3 1/10/91
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*
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* fpsp_fline --- FPSP handler for fline exception
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*
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* First determine if the exception is one of the unimplemented
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* floating point instructions. If so, let fpsp_unimp handle it.
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* Next, determine if the instruction is an fmovecr with a non-zero
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* <ea> field. If so, handle here and return. Otherwise, it
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* must be a real F-line exception.
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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_FLINE IDNT 2,1 Motorola 040 Floating Point Software Package
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fline: ; <1/8/91, JPO>
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fpsp_fline:
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*
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* check for unimplemented vector first. Use EXC_VEC-4 because
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* the equate is valid only after a 'link a6' has pushed one more
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* long onto the stack.
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*
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cmp.w #UNIMP_VEC,EXC_VEC-4(a7)
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beq fpsp_unimp
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*
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* fmovecr with non-zero <ea> handling here
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*
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sub.l #4,a7 ;4 accounts for 2-word difference
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* ;between six word frame (unimp) and
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* ;four word frame
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link a6,#-LOCAL_SIZE
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fsave -(a7) ; ADDED <6/13/91, JPO> <T3>
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movem.l d0-d1/a0-a1,USER_DA(a6)
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movea.l EXC_PC+4(a6),a0 ;get address of fline instruction
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; lea.l L_SCR1(a6),a1 ;use L_SCR1 as scratch - deleted <1/8/91, JPO>
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; move.l #4,d0 ; deleted <1/8/91, JPO>
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; bsr.l mem_read ; deleted <1/8/91, JPO>
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; move.l L_SCR1(a6),d0 ;d0 contains the fline and command word - deleted <1/8/91, JPO>
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move.l (a0),d0 ; d0 contains the fline and command word <1/8/91, JPO>
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bfextu d0{4:3},d1 ;extract coprocessor id
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cmpi.b #1,d1 ;check if cpid=1
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bne.b not_mvcr ;exit if not
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bfextu d0{16:6},d1
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cmpi.b #$17,d1 ;check if it is an FMOVECR encoding
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bne.b not_mvcr
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* ;if an FMOVECR instruction, fix stack
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* ;and go to FPSP_UNIMP
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;fix_stack: ; label deleted <1/8/91, JPO>
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cmpi.b #VER_40,(a7) ;test for orig unimp frame
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bne.b flck_rev ; label renamed <1/8/91, JPO>
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; sub.l #UNIMP_40_SIZE,a7 ;emulate an orig fsave - DELETED <6/13/91, JPO> <T3>
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sub.l #UNIMP_40_SIZE-4,a7 ;emulate an orig fsave - ADDED <6/13/91, JPO> <T3>
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move.b #VER_40,(a7)
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; clr.b 1(a7) ; DELETED <6/13/91, JPO> <T3>
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move.b #UNIMP_40_SIZE-4,1(a7) ; ADDED <6/13/91, JPO> <T3>
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clr.w 2(a7)
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bra.b fix_con
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flck_rev: ; label renamed <1/8/91, JPO>
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cmpi.b #VER_41,(a7) ;test for rev unimp frame
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bne fpsp_fmt_error ;if not $40 or $41, exit with error
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; sub.l #UNIMP_41_SIZE,a7 ;emulate a rev fsave - DELETED <6/13/91, JPO> <T3>
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sub.l #UNIMP_41_SIZE-4,a7 ;emulate a rev fsave - ADDED <6/13/91, JPO> <T3>
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move.b #VER_41,(a7)
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; clr.b 1(a7) ; DELETED <6/13/91, JPO> <T3>
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move.b #UNIMP_41_SIZE-4,1(a7) ; ADDED <6/13/91, JPO> <T3>
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clr.w 2(a7)
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fix_con:
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move.w EXC_SR+4(a6),EXC_SR(a6) ;move stacked sr to new position
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move.l EXC_PC+4(a6),EXC_PC(a6) ;move stacked pc to new position
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fmove.l EXC_PC(a6),FPIAR ;point FPIAR to fline inst
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move.l #4,d1
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add.l d1,EXC_PC(a6) ;increment stacked pc value to next inst
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move.w #$202c,EXC_VEC(a6) ;reformat vector to unimp
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clr.l EXC_EA(a6) ;clear the EXC_EA field
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move.w d0,CMDREG1B(a6) ;move the lower word into CMDREG1B
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clr.l E_BYTE(a6)
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bset.b #UFLAG,T_BYTE(a6)
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movem.l USER_DA(a6),d0-d1/a0-a1 ;restore data registers
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bra uni_2
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not_mvcr:
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movem.l USER_DA(a6),d0-d1/a0-a1 ;restore data registers
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frestore (a7)+ ; ADDED <6/13/91, JPO> <T3>
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unlk a6
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add.l #4,a7
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; bra.l real_fline ; deleted <1/8/91, JPO>
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move.l (FLINE_VEC040).W,-(sp) ; push vector to user's handler <1/8/91, JPO>
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rts ; execute user's handler <1/8/91, JPO>
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