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sys7.1-doc-wip/OS/FPUEmulation/GetOp.a
Horst Beepmanh 33cd9271f4 SuperMarioProj.1994-02-09
2019-07-27 22:37:48 +08:00

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;
; File: GetOp.a
;
; Contains: FPU Emulation Package routines to handle Unsupported format/data types
;
; Originally Written by: Motorola Inc.
; Adapted to Apple/MPW: Jon Okada
;
; Copyright: © 1990, 1991 by Apple Computer, Inc., all rights reserved.
;
; This file is used in these builds: Mac32
;
; Change History (most recent first):
;
; <4> 5/24/91 BG Further streamlined "mk_norm" to treat opclass 0 and opclass 3
; cases the same.
; <3> 4/13/91 BG Fixed a bug which caused incorrect exception flags and results
; for unnormalized extended input with denormal values.
; <2> 3/30/91 BG Rolling in Jon Okada's latest changes.
; <1> 12/14/90 BG First checked into TERROR/BBS.
; getop.a
; Based upon Motorola file 'get_op.sa'.
; CHANGE LOG:
; 04 Jan 91 JPO Moved constant tables for FMOVECR operation to
; file 'constants.a'. Renamed labels "opclass3"
; and "not_fmovecr" to "gopclass3" and "gnot_fmovecr",
; respectively.
; 13 Mar 91 JPO Refined test for packed decimal SRC for unsupported
; data/format exception (opclass 2).
; 11 Apr 91 JPO Cleaned up subroutine "mk_norm" to properly handle
; unnormalized input with subnormal (denormal) values
; for both unimplemented instruction and unsupported
; format exception handlers. Note that tag masks are
; byte-wide.
; 17 Apr 91 JPO Further streamlined "mk_norm" to treat opclass 0 and
; opclass 3 cases the same.
;
*
* get_op.sa 3.1 12/10/90
*
* Description: This routine is called by the unsupported format/data
* type exception handler ('unsupp' - vector 55) and the unimplemented
* instruction exception handler ('unimp' - vector 11). 'get_op'
* determines the opclass (0, 2, or 3) and branches to the
* opclass handler routine. See 68881/2 User's Manual table 4-11
* for a description of the opclasses.
*
* For UNSUPPORTED data/format (exception vector 55) and for
* UNIMPLEMENTED instructions (exception vector 11) the following
* applies:
*
* - For unnormormalized numbers (opclass 0, 2, or 3) the
* number(s) is normalized and the operand type tag is updated.
*
* - For a packed number (opclass 2) the number is unpacked and the
* operand type tag is updated.
*
* - For denormalized numbers (opclass 0 or 2) the number(s) is not
* changed but passed to the next module. The next module for
* unimp is do_func, the next module for unsupp is res_func.
*
* For UNSUPPORTED data/format (exception vector 55) only the
* following applies:
*
* - If there is a move out with a packed number (opclass 3) the
* number is packed and written to user memory. For the other
* opclasses the number(s) are written back to the fsave stack
* and the instruction is then restored back into the '040. The
* '040 is then able to complete the instruction.
*
* For example:
* fadd.x fpm,fpn where the fpm contains an unnormalized number.
* The '040 takes an unsupported data trap and gets to this
* routine. The number is normalized, put back on the stack and
* then an frestore is done to restore the instruction back into
* the '040. The '040 then re-executes the fadd.x fpm,fpn with
* a normalized number in the source and the instruction is
* successful.
*
* Next consider if in the process of normalizing the un-
* normalized number it becomes a denormalized number. The
* routine which converts the unnorm to a norm (called mk_norm)
* detects this and tags the number as a denorm. The routine
* res_func sees the denorm tag and converts the denorm to a
* norm. The instruction is then restored back into the '040
* which re_executess the instruction.
*
*
* Copyright (C) Motorola, Inc. 1990
* All Rights Reserved
*
* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA
* The copyright notice above does not evidence any
* actual or intended publication of such source code.
* GET_OP IDNT 2,1 Motorola 040 Floating Point Software Package
get_op:
clr.b DY_MO_FLG(a6)
tst.b UFLG_TMP(a6) ;test flag for unsupp/unimp state
beq.b uni_getop
uns_getop:
btst.b #direction_bit,CMDREG1B(a6)
bne.w gopclass3 ;branch if a fmove out (any kind) - label RENAMED <1/4/91, JPO>
btst.b #6,CMDREG1B(a6) ; opclass 2 (memory to reg)? <3/13/91, JPO>
beq.b @1 ; no. opclass 0 (reg to reg) <3/13/91, JPO>
bfextu CMDREG1B(a6){3:3},d0
cmp.b #3,d0
beq.w pack_source ;check for a packed src op, branch if so
@1: ; label ADDED <3/13/91, JPO>
bsr chk_dy_mo ;set the dyadic/monadic flag
tst.b DY_MO_FLG(a6)
beq.b src_op_ck ;if monadic, go check src op
* ;else, check dst op (fall through)
btst.b #7,DTAG(a6)
beq.b src_op_ck ;if dst op is norm, check src op
bra.b dst_ex_dnrm ;else, handle destination unnorm/dnrm
uni_getop:
bfextu CMDREG1B(a6){0:6},d0 ;get opclass and src fields
cmpi.l #$17,d0 ;if op class and size fields are $17,
* ;it is FMOVECR; if not, continue
*
* If the instruction is fmovecr, exit get_op. It is handled
* in do_func and smovecr.sa.
*
bne.b gnot_fmovecr ;handle fmovecr as an unimplemented inst - label RENAMED <1/4/91, JPO>
rts
gnot_fmovecr: ; label RENAMED <1/4/91, JPO>
btst.b #E1,E_BYTE(a6) ;if set, there is a packed operand
bne.w pack_source ;check for packed src op, branch if so
* The following lines of are coded to optimize on normalized operands
move.b STAG(a6),d0
or.b DTAG(a6),d0 ;check if either of STAG/DTAG msb set
bmi.b dest_op_ck ;if so, some op needs to be fixed
rts
dest_op_ck:
btst.b #7,DTAG(a6) ;check for unsupported data types in
beq.b src_op_ck ;the destination, if not, check src op
bsr chk_dy_mo ;set dyadic/monadic flag
tst.b DY_MO_FLG(a6) ;
beq.b src_op_ck ;if monadic, check src op
*
* At this point, destination has an extended denorm or unnorm.
*
dst_ex_dnrm:
move.w FPTEMP_EX(a6),d0 ;get destination exponent
andi.w #$7fff,d0 ;mask sign, check if exp = 0000
beq.b src_op_ck ;if denorm then check source op.
* ;denorms are taken care of in res_func
* ;(unsupp) or do_func (unimp)
* ;else unnorm fall through
lea.l FPTEMP(a6),a0 ;point a0 to dop - used in mk_norm
bsr mk_norm ;go normalize - mk_norm returns:
* ;L_SCR1{7:5} = operand tag
* ; (000 = norm, 100 = denorm)
* ;L_SCR1{4} = fpte15 or ete15
* ; 0 = exp > $3fff
* ; 1 = exp <= $3fff
* ;and puts the normalized num back
* ;on the fsave stack
*
move.b L_SCR1(a6),DTAG(a6) ;write the new tag & fpte15
* ;to the fsave stack and fall
* ;through to check source operand
*
src_op_ck:
btst.b #7,STAG(a6)
beq.w end_getop ;check for unsupported data types on the
* ;source operand
btst.b #5,STAG(a6)
bne.b src_sd_dnrm ;if bit 5 set, handle sgl/dbl denorms
*
* At this point only unnorms or extended denorms are possible.
*
src_ex_dnrm:
move.w ETEMP_EX(a6),d0 ;get source exponent
andi.w #$7fff,d0 ;mask sign, check if exp = 0000
beq.w end_getop ;if denorm then exit, denorms are
* ;handled in do_func
lea.l ETEMP(a6),a0 ;point a0 to sop - used in mk_norm
bsr mk_norm ;go normalize - mk_norm returns:
* ;L_SCR1{7:5} = operand tag
* ; (000 = norm, 100 = denorm)
* ;L_SCR1{4} = fpte15 or ete15
* ; 0 = exp > $3fff
* ; 1 = exp <= $3fff
* ;and puts the normalized num back
* ;on the fsave stack
*
move.b L_SCR1(a6),STAG(a6) ;write the new tag & ete15
rts ;end_getop
*
* At this point, only single or double denorms are possible.
* If the inst is not fmove, normalize the source. If it is,
* do nothing to the input.
*
src_sd_dnrm:
btst.b #4,CMDREG1B(a6) ;differentiate between sgl/dbl denorm
bne.b is_double
is_single:
move.w #$3f81,d1 ;write bias for sgl denorm
bra.b common ;goto the common code
is_double:
move.w #$3c01,d1 ;write the bias for a dbl denorm
common:
btst.b #sign_bit,ETEMP_EX(a6) ;grab sign bit of mantissa
beq.b pos
bset #15,d1 ;set sign bit because it is negative
pos:
move.w d1,ETEMP_EX(a6)
* ;put exponent on stack
move.w CMDREG1B(a6),d1
and.w #$e3ff,d1 ;clear out source specifier
or.w #$0800,d1 ;set source specifier to extended prec
move.w d1,CMDREG1B(a6) ;write back to the command word in stack
* ;this is needed to fix unsupp data stack
lea.l ETEMP(a6),a0 ;point a0 to sop
bsr mk_norm ;convert sgl/dbl denorm to norm
move.b L_SCR1(a6),STAG(a6) ;put tag into source tag reg - d0
rts ;end_getop
*
* At this point, the source is definitely packed, whether
* instruction is dyadic or monadic is still unknown
*
pack_source:
move.l FPTEMP_LO(a6),ETEMP(a6) ;write ms part of packed
* ;number to etemp slot
bsr.b chk_dy_mo ;set dyadic/monadic flag
bsr unpack
tst.b DY_MO_FLG(a6)
beq.b end_getop ;if monadic, exit
* ;else, fix FPTEMP
pack_dya:
bfextu CMDREG1B(a6){6:3},d0 ;extract dest fp reg
move.l #7,d1
sub.l d0,d1
clr.l d0
bset.l d1,d0 ;set up d0 as a dynamic register mask
fmovem.x d0,FPTEMP(a6) ;write to FPTEMP
btst.b #7,DTAG(a6) ;check dest tag for unnorm or denorm
bne.w dst_ex_dnrm ;else, handle the unnorm or ext denorm
*
* Dest is not denormalized. Check for norm, and set fpte15
* accordingly.
*
move.b DTAG(a6),d0
andi.b #$f0,d0 ;strip to only dtag:fpte15
tst.b d0 ;check for normalized value
bne.b end_getop ;if inf/nan/zero leave get_op
move.w FPTEMP_EX(a6),d0
andi.w #$7fff,d0
cmpi.w #$3fff,d0 ;check if fpte15 needs setting
bge.b end_getop ;if >= $3fff, leave fpte15=0
or.b #$10,DTAG(a6)
bra.b end_getop
*
* At this point, it is either an fmoveout packed, unnorm or denorm
*
gopclass3: ; label renamed <1/4/91, JPO>
clr.b DY_MO_FLG(a6) ;set dyadic/monadic flag to monadic
bfextu CMDREG1B(a6){4:2},d0
cmpi.b #3,d0
bne.w src_ex_dnrm ;if not equal, must be unnorm or denorm
* ;else it is a packed move out
* ;exit
end_getop:
rts
*
* Sets the DY_MO_FLG correctly. This is used only on if it is an
* unuspported data type exception. Set if dyadic.
*
chk_dy_mo:
move.w CMDREG1B(a6),d0
btst.l #5,d0 ;testing extension command word
beq.b set_mon ;if bit 5 = 0 then monadic
btst.l #4,d0 ;know that bit 5 = 1
beq.b set_dya ;if bit 4 = 0 then dyadic
andi.w #$007f,d0 ;get rid of all but extension bits {6:0}
cmpi.w #$0038,d0 ;if extension = $38 then fcmp (dyadic)
bne.b set_mon
set_dya:
st.b DY_MO_FLG(a6) ;set the inst flag type to dyadic
rts
set_mon:
clr.b DY_MO_FLG(a6) ;set the inst flag type to monadic
rts
*
* MK_NORM - MODIFIED <4/17/91, JPO>
*
* Normalizes unnormalized numbers, sets tag to norm or denorm
*
* mk_norm till msb set or exp = 0
* if integer bit = 0
* tag = denorm
* else
* tag = norm
*
* if exp <= $3fff
* set ete15 or fpte15 = 1
* else
* set ete15 or fpte15 = 0
*
* input:
* a0 = points to operand to be normalized
* output:
* L_SCR1{7:5} = operand tag (000 = norm, 100 = denorm)
* L_SCR1{4} = fpte15 or ete15 (0 = exp > $3fff, 1 = exp <=$3fff)
* the normalized operand is placed back on the fsave stack
mk_norm:
clr.l L_SCR1(a6)
bclr.b #sign_bit,LOCAL_EX(a0)
sne LOCAL_SGN(a0) ;transform into internal extended format
; cmpi.b #$2c,1+EXC_VEC(a6) ;check if unimp - DELETED <4/17/91, JPO> <T4> thru next <T4>
; bne.b uns_data ;branch if unsupp - DELETED <4/17/91, JPO>
; bsr.b uni_inst ;call if unimp (opclass 0x0) - DELETED <4/17/91, JPO>
; bra.b reload ; DELETED <4/11/91, JPO>
; beq.b uni_inst ; unimplemented <4/11/91, JPO> - DELETED <4/17/91, JPO>
;uns_data: ; label DELETED - <4/11/91, JPO>
; btst.b #direction_bit,CMDREG1B(a6) ;check transfer direction - DELETED <4/17/91, JPO> <T4>
; bne.b bit_set ;branch if set (opclass 011) - DELETED <4/11/91, JPO>
; bsr.b uns_opx ;call if opclass 0x0 - DELETED <4/11/91, JPO>
; bra.b reload ; DELETED <4/11/91, JPO>
;
; bne.b uns_op3 ; opclass 011 <4/11/91, JPO> - DELETED <4/17/91, JPO> <T4>
;bit_set: ; label DELETED <4/11/91, JPO>
; bsr.b uns_op3 ;opclass 011 - DELETED <4/11/91, JPO>
;
; CASE opclass 0 unsupported or unimplemented - MOVED inline from below <4/11/91, JPO>
;
;uni_inst: ; label DELETED <4/17/91, JPO> <T4>
bsr nrm_zero ; <4/11/91, JPO>
btst.b #7,LOCAL_HI(a0) ;check if integer bit (j-bit) is set
; beq.b uns_den ;if clear then now have a denorm - DELETED <4/11/91, JPO>
bne.b reload ;if set, now have a norm <4/11/91, JPO>
; or.w #norm_tag,L_SCR1(a6) ;set tag to norm - DELETED <4/11/91, JPO>
; rts ; DELETED <4/11/91, JPO>
;uns_den: ; label DELETED <4/11/91, JPO>
; or.w #dnrm_tag,L_SCR1(a6) ;set tag to norm - DELETED <4/11/91, JPO>
or.b #dnrm_tag,L_SCR1(a6) ; set byte tag to denorm <4/11/91, JPO> <T3>
reload:
cmp.w #$3fff,LOCAL_EX(a0) ;if exp > $3fff
bgt.b end_mk ; fpte15/ete15 already set to 0
bset.b #4,L_SCR1(a6) ;else set fpte15/ete15 to 1
* ;calling routine actually sets the
* ;value on the stack (along with the
* ;tag), since this routine doesn't
* ;know if it should set ete15 or fpte15
* ;ie, it doesn't know if this is the
* ;src op or dest op.
end_mk:
bfclr LOCAL_SGN(a0){0:8}
beq.b end_mk_pos
bset.b #sign_bit,LOCAL_EX(a0) ;convert back to IEEE format
end_mk_pos:
rts
;*
;* CASE opclass 011 unsupp - modified from subroutine to inline <4/11/91, JPO> <T4> thru next <T4>
;* then DELETED <4/17/91 JPO>
;uns_op3:
; bsr nrm_zero ;normalize till msb = 1 or exp = zero
; btst.b #7,LOCAL_HI(a0) ;if msb = 1
; bne.b no_unfl ;then branch
;set_unfl:
; or.w #dnrm_tag,L_SCR1(a6) ;set denorm tag - DELETED <4/11/91, JPO>
; or.b #dnrm_tag,L_SCR1(a6) ; set denorm in byte tag <4/11/91, JPO>
; bset.b #unfl_bit,FPSR_EXCEPT(a6) ;set unfl exception bit
no_unfl:
; rts ; DELETED <4/11/91, JPO>
; bra.b reload ; finish up mk_norm <4/11/91, JPO> <T4>
*
* CASE opclass 0x0 unsupp - routine DELETED <4/11/91, JPO>
*
;uns_opx:
; bsr nrm_zero ;normalize the number
; or.w #norm_tag,L_SCR1(a6) ;set tag to norm
; rts
*
* CASE opclass 0x0 unimp - routine MOVED inline above <4/11/91, JPO>
*
;uni_inst:
; bsr nrm_zero
; btst.b #7,LOCAL_HI(a0) ;check if integer bit (j-bit) is set
; beq.b uns_den ;if clear then now have a denorm
;uns_nrm:
; or.w #norm_tag,L_SCR1(a6) ;set tag to norm
; rts
;uns_den:
; or.w #dnrm_tag,L_SCR1(a6) ;set tag to norm
; rts <T3>
*
* Decimal to binary conversion
*
* Special cases of inf and NaNs are completed outside of decbin.
* If the input is an snan, the snan bit is not set.
*
* input:
* ETEMP(a6) - points to packed decimal string in memory
* output:
* fp0 - contains packed string converted to extended precision
* ETEMP - same as fp0
unpack:
move.w CMDREG1B(a6),d0 ;examine command word, looking for fmove's
and.w #$3b,d0
beq move_unpack ;special handling for fmove: must set FPSR_CC
move.w ETEMP(a6),d0 ;get word with inf information
bfextu d0{20:12},d1 ;get exponent into d1
cmpi.w #$0fff,d1 ;test for inf or NaN
bne.b try_zero ;if not equal, it is not special
bfextu d0{17:3},d1 ;get SE and y bits into d1
cmpi.w #7,d1 ;SE and y bits must be on for special
bne.b try_zero ;if not on, it is not special
*input is of the special cases of inf and NaN
tst.l ETEMP_HI(a6) ;check ms mantissa
bne.b fix_nan ;if non-zero, it is a NaN
tst.l ETEMP_LO(a6) ;check ls mantissa
bne.b fix_nan ;if non-zero, it is a NaN
bra.w finish ;special already on stack
fix_nan:
btst.b #signan_bit,ETEMP_HI(a6) ;test for snan
bne.w finish
or.l #snaniop_mask,USER_FPSR(a6) ;always set snan if it is so
bra.w finish
try_zero:
move.w ETEMP_EX+2(a6),d0 ;get word 4
andi.w #$000f,d0 ;clear all but last ni(y)bble
tst.w d0 ;check for zero.
bne.b not_spec
tst.l ETEMP_HI(a6) ;check words 3 and 2
bne.b not_spec
tst.l ETEMP_LO(a6) ;check words 1 and 0
bne.b not_spec
tst.l ETEMP(a6) ;test sign of the zero
bge.b pos_zero
move.l #$80000000,ETEMP(a6) ;write neg zero to etemp
clr.l ETEMP_HI(a6)
clr.l ETEMP_LO(a6)
bra.w finish
pos_zero:
clr.l ETEMP(a6)
clr.l ETEMP_HI(a6)
clr.l ETEMP_LO(a6)
bra.w finish
not_spec:
fmovem.x fp0,-(a7) ;save fp0 - decbin returns in it
bsr decbin
fmove.x fp0,ETEMP(a6) ;put the unpacked sop in the fsave stack
fmovem.x (a7)+,fp0
fmove.l #0,FPSR ;clr fpsr from decbin
bra finish
*
* Special handling for packed move in: Same results as all other
* packed cases, but we must set the FPSR condition codes properly.
*
move_unpack:
move.w ETEMP(a6),d0 ;get word with inf information
bfextu d0{20:12},d1 ;get exponent into d1
cmpi.w #$0fff,d1 ;test for inf or NaN
bne.b mtry_zero ;if not equal, it is not special
bfextu d0{17:3},d1 ;get SE and y bits into d1
cmpi.w #7,d1 ;SE and y bits must be on for special
bne.b mtry_zero ;if not on, it is not special
*input is of the special cases of inf and NaN
tst.l ETEMP_HI(a6) ;check ms mantissa
bne.b mfix_nan ;if non-zero, it is a NaN
tst.l ETEMP_LO(a6) ;check ls mantissa
bne.b mfix_nan ;if non-zero, it is a NaN
*input is inf
or.l #inf_mask,USER_FPSR(a6) ;set I bit
tst.l ETEMP(a6) ;check sign
bge.w finish
or.l #neg_mask,USER_FPSR(a6) ;set N bit
bra.w finish ;special already on stack
mfix_nan:
or.l #nan_mask,USER_FPSR(a6) ;set NaN bit
move.b #nan_tag,STAG(a6) ;set stag to NaN
btst.b #signan_bit,ETEMP_HI(a6) ;test for snan
bne.b mn_snan
or.l #snaniop_mask,USER_FPSR(a6) ;set snan bit
btst.b #snan_bit,FPCR_ENABLE(a6) ;test for snan enabled
bne.b mn_snan
bset.b #signan_bit,ETEMP_HI(a6) ;force snans to qnans
mn_snan:
tst.l ETEMP(a6) ;check for sign
bge.b finish ;if clr, go on
or.l #neg_mask,USER_FPSR(a6) ;set N bit
bra.b finish
mtry_zero:
move.w ETEMP_EX+2(a6),d0 ;get word 4
andi.w #$000f,d0 ;clear all but last ni(y)bble
tst.w d0 ;check for zero.
bne.b mnot_spec
tst.l ETEMP_HI(a6) ;check words 3 and 2
bne.b mnot_spec
tst.l ETEMP_LO(a6) ;check words 1 and 0
bne.b mnot_spec
tst.l ETEMP(a6) ;test sign of the zero
bge.b mpos_zero
or.l #neg_mask+z_mask,USER_FPSR(a6) ;set N and Z
move.l #$80000000,ETEMP(a6) ;write neg zero to etemp
clr.l ETEMP_HI(a6)
clr.l ETEMP_LO(a6)
bra.b finish
mpos_zero:
or.l #z_mask,USER_FPSR(a6) ;set Z
clr.l ETEMP(a6)
clr.l ETEMP_HI(a6)
clr.l ETEMP_LO(a6)
bra.b finish
mnot_spec:
fmovem.x fp0,-(a7) ;save fp0 - decbin returns in it
bsr decbin
fmove.x fp0,ETEMP(a6)
* ;put the unpacked sop in the fsave stack
fmovem.x (a7)+,fp0
finish:
move.w CMDREG1B(a6),d0 ;get the command word
and.w #$fbff,d0 ;change the source specifier field to
* ;extended (was packed).
move.w d0,CMDREG1B(a6) ;write command word back to fsave stack
* ;we need to do this so the 040 will
* ;re-execute the inst. without taking
* ;another packed trap.
fix_stag:
*Converted result is now in etemp on fsave stack, now set the source
*tag (stag)
* if (ete =$7fff) then INF or NAN
* if (etemp = $x.0----0) then
* stag = INF
* else
* stag = NAN
* else
* if (ete = $0000) then
* stag = ZERO
* else
* stag = NORM
*
* Note also that the etemp_15 bit (just right of the stag) must
* be set accordingly.
*
move.w ETEMP_EX(a6),d1
andi.w #$7fff,d1 ;strip sign
cmp.w #$7fff,d1
bne.b z_or_nrm
move.l ETEMP_HI(a6),d1
bne.b is_nan
move.l ETEMP_LO(a6),d1
bne.b is_nan
is_inf:
move.b #$40,STAG(a6)
move.l #$40,d0
rts
is_nan:
move.b #$60,STAG(a6)
move.l #$60,d0
rts
z_or_nrm:
tst.w d1
bne.b is_nrm
is_zro:
* For a zero, set etemp_15
move.b #$30,STAG(a6)
move.l #$20,d0
rts
is_nrm:
* For a norm, check if the exp <= $3fff; if so, set etemp_15
cmpi.w #$3fff,d1
ble.b set_bit15
move.b #0,STAG(a6)
bra.b end_is_nrm
set_bit15:
move.b #$10,STAG(a6)
end_is_nrm:
move.l #0,d0
end_fix:
rts
end_get:
rts
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