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|
|       util.sa 3.7 7/29/91
|
|       This file contains routines used by other programs.
|
|       ovf_res: used by overflow to force the correct
|                result. ovf_r_k, ovf_r_x2, ovf_r_x3 are 
|                derivatives of this routine.
|       get_fline: get user's opcode word
|       g_dfmtou: returns the destination format.
|       g_opcls: returns the opclass of the float instruction.
|       g_rndpr: returns the rounding precision. 
|       reg_dest: write byte, word, or long data to Dn
|
|
|               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|       THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA 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.

|UTIL   idnt    2,1 | Motorola 040 Floating Point Software Package

        |section        8

        .include "fpsp.h"

        |xref   mem_read

        .global g_dfmtou
        .global g_opcls
        .global g_rndpr
        .global get_fline
        .global reg_dest

|
| Final result table for ovf_res. Note that the negative counterparts
| are unnecessary as ovf_res always returns the sign separately from
| the exponent.
|                                       ;+inf
EXT_PINF:       .long   0x7fff0000,0x00000000,0x00000000,0x00000000     
|                                       ;largest +ext
EXT_PLRG:       .long   0x7ffe0000,0xffffffff,0xffffffff,0x00000000     
|                                       ;largest magnitude +sgl in ext
SGL_PLRG:       .long   0x407e0000,0xffffff00,0x00000000,0x00000000     
|                                       ;largest magnitude +dbl in ext
DBL_PLRG:       .long   0x43fe0000,0xffffffff,0xfffff800,0x00000000     
|                                       ;largest -ext

tblovfl:
        .long   EXT_RN
        .long   EXT_RZ
        .long   EXT_RM
        .long   EXT_RP
        .long   SGL_RN
        .long   SGL_RZ
        .long   SGL_RM
        .long   SGL_RP
        .long   DBL_RN
        .long   DBL_RZ
        .long   DBL_RM
        .long   DBL_RP
        .long   error
        .long   error
        .long   error
        .long   error


|
|       ovf_r_k --- overflow result calculation
|
| This entry point is used by kernel_ex.  
|
| This forces the destination precision to be extended
|
| Input:        operand in ETEMP
| Output:       a result is in ETEMP (internal extended format)
|
        .global ovf_r_k
ovf_r_k:
        lea     ETEMP(%a6),%a0  |a0 points to source operand    
        bclrb   #sign_bit,ETEMP_EX(%a6)
        sne     ETEMP_SGN(%a6)  |convert to internal IEEE format

|
|       ovf_r_x2 --- overflow result calculation
|
| This entry point used by x_ovfl.  (opclass 0 and 2)
|
| Input         a0  points to an operand in the internal extended format
| Output        a0  points to the result in the internal extended format
|
| This sets the round precision according to the user's FPCR unless the
| instruction is fsgldiv or fsglmul or fsadd, fdadd, fsub, fdsub, fsmul,
| fdmul, fsdiv, fddiv, fssqrt, fsmove, fdmove, fsabs, fdabs, fsneg, fdneg.
| If the instruction is fsgldiv of fsglmul, the rounding precision must be
| extended.  If the instruction is not fsgldiv or fsglmul but a force-
| precision instruction, the rounding precision is then set to the force
| precision.

        .global ovf_r_x2
ovf_r_x2:
        btstb   #E3,E_BYTE(%a6)         |check for nu exception
        beql    ovf_e1_exc              |it is cu exception
ovf_e3_exc:
        movew   CMDREG3B(%a6),%d0               |get the command word
        andiw   #0x00000060,%d0         |clear all bits except 6 and 5
        cmpil   #0x00000040,%d0
        beql    ovff_sgl                |force precision is single
        cmpil   #0x00000060,%d0
        beql    ovff_dbl                |force precision is double
        movew   CMDREG3B(%a6),%d0               |get the command word again
        andil   #0x7f,%d0                       |clear all except operation
        cmpil   #0x33,%d0                       
        beql    ovf_fsgl                |fsglmul or fsgldiv
        cmpil   #0x30,%d0
        beql    ovf_fsgl                
        bra     ovf_fpcr                |instruction is none of the above
|                                       ;use FPCR
ovf_e1_exc:
        movew   CMDREG1B(%a6),%d0               |get command word
        andil   #0x00000044,%d0         |clear all bits except 6 and 2
        cmpil   #0x00000040,%d0
        beql    ovff_sgl                |the instruction is force single
        cmpil   #0x00000044,%d0
        beql    ovff_dbl                |the instruction is force double
        movew   CMDREG1B(%a6),%d0               |again get the command word
        andil   #0x0000007f,%d0         |clear all except the op code
        cmpil   #0x00000027,%d0
        beql    ovf_fsgl                |fsglmul
        cmpil   #0x00000024,%d0
        beql    ovf_fsgl                |fsgldiv
        bra     ovf_fpcr                |none of the above, use FPCR
| 
|
| Inst is either fsgldiv or fsglmul.  Force extended precision.
|
ovf_fsgl:
        clrl    %d0
        bras    ovf_res

ovff_sgl:
        movel   #0x00000001,%d0         |set single
        bras    ovf_res
ovff_dbl:
        movel   #0x00000002,%d0         |set double
        bras    ovf_res
|
| The precision is in the fpcr.
|
ovf_fpcr:
        bfextu  FPCR_MODE(%a6){#0:#2},%d0 |set round precision
        bras    ovf_res
        
|
|
|       ovf_r_x3 --- overflow result calculation
|
| This entry point used by x_ovfl. (opclass 3 only)
|
| Input         a0  points to an operand in the internal extended format
| Output        a0  points to the result in the internal extended format
|
| This sets the round precision according to the destination size.
|
        .global ovf_r_x3
ovf_r_x3:
        bsr     g_dfmtou        |get dest fmt in d0{1:0}
|                               ;for fmovout, the destination format
|                               ;is the rounding precision

|
|       ovf_res --- overflow result calculation
|
| Input:
|       a0      points to operand in internal extended format
| Output:
|       a0      points to result in internal extended format
|
        .global ovf_res
ovf_res:
        lsll    #2,%d0          |move round precision to d0{3:2}
        bfextu  FPCR_MODE(%a6){#2:#2},%d1 |set round mode
        orl     %d1,%d0         |index is fmt:mode in d0{3:0}
        leal    tblovfl,%a1     |load a1 with table address
        movel   %a1@(%d0:l:4),%a1       |use d0 as index to the table
        jmp     (%a1)           |go to the correct routine
|
|case DEST_FMT = EXT
|
EXT_RN:
        leal    EXT_PINF,%a1    |answer is +/- infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bra     set_sign        |now go set the sign    
EXT_RZ:
        leal    EXT_PLRG,%a1    |answer is +/- large number
        bra     set_sign        |now go set the sign
EXT_RM:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    e_rm_pos
e_rm_neg:
        leal    EXT_PINF,%a1    |answer is negative infinity
        orl     #neginf_mask,USER_FPSR(%a6)
        bra     end_ovfr
e_rm_pos:
        leal    EXT_PLRG,%a1    |answer is large positive number
        bra     end_ovfr
EXT_RP:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    e_rp_pos
e_rp_neg:
        leal    EXT_PLRG,%a1    |answer is large negative number
        bsetb   #neg_bit,FPSR_CC(%a6)
        bra     end_ovfr
e_rp_pos:
        leal    EXT_PINF,%a1    |answer is positive infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bra     end_ovfr
|
|case DEST_FMT = DBL
|
DBL_RN:
        leal    EXT_PINF,%a1    |answer is +/- infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bra     set_sign
DBL_RZ:
        leal    DBL_PLRG,%a1    |answer is +/- large number
        bra     set_sign        |now go set the sign
DBL_RM:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    d_rm_pos
d_rm_neg:
        leal    EXT_PINF,%a1    |answer is negative infinity
        orl     #neginf_mask,USER_FPSR(%a6)
        bra     end_ovfr        |inf is same for all precisions (ext,dbl,sgl)
d_rm_pos:
        leal    DBL_PLRG,%a1    |answer is large positive number
        bra     end_ovfr
DBL_RP:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    d_rp_pos
d_rp_neg:
        leal    DBL_PLRG,%a1    |answer is large negative number
        bsetb   #neg_bit,FPSR_CC(%a6)
        bra     end_ovfr
d_rp_pos:
        leal    EXT_PINF,%a1    |answer is positive infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bra     end_ovfr
|
|case DEST_FMT = SGL
|
SGL_RN:
        leal    EXT_PINF,%a1    |answer is +/-  infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bras    set_sign
SGL_RZ:
        leal    SGL_PLRG,%a1    |answer is +/- large number
        bras    set_sign
SGL_RM:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    s_rm_pos
s_rm_neg:
        leal    EXT_PINF,%a1    |answer is negative infinity
        orl     #neginf_mask,USER_FPSR(%a6)
        bras    end_ovfr
s_rm_pos:
        leal    SGL_PLRG,%a1    |answer is large positive number
        bras    end_ovfr
SGL_RP:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    s_rp_pos
s_rp_neg:
        leal    SGL_PLRG,%a1    |answer is large negative number
        bsetb   #neg_bit,FPSR_CC(%a6)
        bras    end_ovfr
s_rp_pos:
        leal    EXT_PINF,%a1    |answer is positive infinity
        bsetb   #inf_bit,FPSR_CC(%a6)
        bras    end_ovfr

set_sign:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    end_ovfr
neg_sign:
        bsetb   #neg_bit,FPSR_CC(%a6)

end_ovfr:
        movew   LOCAL_EX(%a1),LOCAL_EX(%a0) |do not overwrite sign
        movel   LOCAL_HI(%a1),LOCAL_HI(%a0)
        movel   LOCAL_LO(%a1),LOCAL_LO(%a0)
        rts


|
|       ERROR
|
error:
        rts
|
|       get_fline --- get f-line opcode of interrupted instruction
|
|       Returns opcode in the low word of d0.
|
get_fline:
        movel   USER_FPIAR(%a6),%a0     |opcode address
        movel   #0,-(%a7)       |reserve a word on the stack
        leal    2(%a7),%a1      |point to low word of temporary
        movel   #2,%d0          |count
        bsrl    mem_read
        movel   (%a7)+,%d0
        rts
|
|       g_rndpr --- put rounding precision in d0{1:0}
|       
|       valid return codes are:
|               00 - extended 
|               01 - single
|               10 - double
|
| begin
| get rounding precision (cmdreg3b{6:5})
| begin
|  case opclass = 011 (move out)
|       get destination format - this is the also the rounding precision
|
|  case opclass = 0x0
|       if E3
|           *case RndPr(from cmdreg3b{6:5} = 11  then RND_PREC = DBL
|           *case RndPr(from cmdreg3b{6:5} = 10  then RND_PREC = SGL
|            case RndPr(from cmdreg3b{6:5} = 00 | 01
|               use precision from FPCR{7:6}
|                       case 00 then RND_PREC = EXT
|                       case 01 then RND_PREC = SGL
|                       case 10 then RND_PREC = DBL
|       else E1
|            use precision in FPCR{7:6}
|            case 00 then RND_PREC = EXT
|            case 01 then RND_PREC = SGL
|            case 10 then RND_PREC = DBL
| end
|
g_rndpr:
        bsr     g_opcls         |get opclass in d0{2:0}
        cmpw    #0x0003,%d0     |check for opclass 011
        bnes    op_0x0

|
| For move out instructions (opclass 011) the destination format
| is the same as the rounding precision.  Pass results from g_dfmtou.
|
        bsr     g_dfmtou        
        rts
op_0x0:
        btstb   #E3,E_BYTE(%a6)
        beql    unf_e1_exc      |branch to e1 underflow
unf_e3_exc:
        movel   CMDREG3B(%a6),%d0       |rounding precision in d0{10:9}
        bfextu  %d0{#9:#2},%d0  |move the rounding prec bits to d0{1:0}
        cmpil   #0x2,%d0
        beql    unff_sgl        |force precision is single
        cmpil   #0x3,%d0                |force precision is double
        beql    unff_dbl
        movew   CMDREG3B(%a6),%d0       |get the command word again
        andil   #0x7f,%d0               |clear all except operation
        cmpil   #0x33,%d0                       
        beql    unf_fsgl        |fsglmul or fsgldiv
        cmpil   #0x30,%d0
        beql    unf_fsgl        |fsgldiv or fsglmul
        bra     unf_fpcr
unf_e1_exc:
        movel   CMDREG1B(%a6),%d0       |get 32 bits off the stack, 1st 16 bits
|                               ;are the command word
        andil   #0x00440000,%d0 |clear all bits except bits 6 and 2
        cmpil   #0x00400000,%d0
        beql    unff_sgl        |force single
        cmpil   #0x00440000,%d0 |force double
        beql    unff_dbl
        movel   CMDREG1B(%a6),%d0       |get the command word again
        andil   #0x007f0000,%d0 |clear all bits except the operation
        cmpil   #0x00270000,%d0
        beql    unf_fsgl        |fsglmul
        cmpil   #0x00240000,%d0
        beql    unf_fsgl        |fsgldiv
        bra     unf_fpcr

|
| Convert to return format.  The values from cmdreg3b and the return
| values are:
|       cmdreg3b        return       precision
|       --------        ------       ---------
|         00,01           0             ext
|          10             1             sgl
|          11             2             dbl
| Force single
|
unff_sgl:
        movel   #1,%d0          |return 1
        rts
|
| Force double
|
unff_dbl:
        movel   #2,%d0          |return 2
        rts
|
| Force extended
|
unf_fsgl:
        movel   #0,%d0          
        rts
|
| Get rounding precision set in FPCR{7:6}.
|
unf_fpcr:
        movel   USER_FPCR(%a6),%d0 |rounding precision bits in d0{7:6}
        bfextu  %d0{#24:#2},%d0 |move the rounding prec bits to d0{1:0}
        rts
|
|       g_opcls --- put opclass in d0{2:0}
|
g_opcls:
        btstb   #E3,E_BYTE(%a6)
        beqs    opc_1b          |if set, go to cmdreg1b
opc_3b:
        clrl    %d0             |if E3, only opclass 0x0 is possible
        rts
opc_1b:
        movel   CMDREG1B(%a6),%d0
        bfextu  %d0{#0:#3},%d0  |shift opclass bits d0{31:29} to d0{2:0}
        rts
|
|       g_dfmtou --- put destination format in d0{1:0}
|
|       If E1, the format is from cmdreg1b{12:10}
|       If E3, the format is extended.
|
|       Dest. Fmt.      
|               extended  010 -> 00
|               single    001 -> 01
|               double    101 -> 10
|
g_dfmtou:
        btstb   #E3,E_BYTE(%a6)
        beqs    op011
        clrl    %d0             |if E1, size is always ext
        rts
op011:
        movel   CMDREG1B(%a6),%d0
        bfextu  %d0{#3:#3},%d0  |dest fmt from cmdreg1b{12:10}
        cmpb    #1,%d0          |check for single
        bnes    not_sgl
        movel   #1,%d0
        rts
not_sgl:
        cmpb    #5,%d0          |check for double
        bnes    not_dbl
        movel   #2,%d0
        rts
not_dbl:
        clrl    %d0             |must be extended
        rts

|
|
| Final result table for unf_sub. Note that the negative counterparts
| are unnecessary as unf_sub always returns the sign separately from
| the exponent.
|                                       ;+zero
EXT_PZRO:       .long   0x00000000,0x00000000,0x00000000,0x00000000     
|                                       ;+zero
SGL_PZRO:       .long   0x3f810000,0x00000000,0x00000000,0x00000000     
|                                       ;+zero
DBL_PZRO:       .long   0x3c010000,0x00000000,0x00000000,0x00000000     
|                                       ;smallest +ext denorm
EXT_PSML:       .long   0x00000000,0x00000000,0x00000001,0x00000000     
|                                       ;smallest +sgl denorm
SGL_PSML:       .long   0x3f810000,0x00000100,0x00000000,0x00000000     
|                                       ;smallest +dbl denorm
DBL_PSML:       .long   0x3c010000,0x00000000,0x00000800,0x00000000     
|
|       UNF_SUB --- underflow result calculation
|
| Input:
|       d0      contains round precision
|       a0      points to input operand in the internal extended format
|
| Output:
|       a0      points to correct internal extended precision result.
|

tblunf:
        .long   uEXT_RN
        .long   uEXT_RZ
        .long   uEXT_RM
        .long   uEXT_RP
        .long   uSGL_RN
        .long   uSGL_RZ
        .long   uSGL_RM
        .long   uSGL_RP
        .long   uDBL_RN
        .long   uDBL_RZ
        .long   uDBL_RM
        .long   uDBL_RP
        .long   uDBL_RN
        .long   uDBL_RZ
        .long   uDBL_RM
        .long   uDBL_RP

        .global unf_sub
unf_sub:
        lsll    #2,%d0          |move round precision to d0{3:2}
        bfextu  FPCR_MODE(%a6){#2:#2},%d1 |set round mode
        orl     %d1,%d0         |index is fmt:mode in d0{3:0}
        leal    tblunf,%a1      |load a1 with table address
        movel   %a1@(%d0:l:4),%a1       |use d0 as index to the table
        jmp     (%a1)           |go to the correct routine
|
|case DEST_FMT = EXT
|
uEXT_RN:
        leal    EXT_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     uset_sign       |now go set the sign    
uEXT_RZ:
        leal    EXT_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     uset_sign       |now go set the sign
uEXT_RM:
        tstb    LOCAL_SGN(%a0)  |if negative underflow
        beqs    ue_rm_pos
ue_rm_neg:
        leal    EXT_PSML,%a1    |answer is negative smallest denorm
        bsetb   #neg_bit,FPSR_CC(%a6)
        bra     end_unfr
ue_rm_pos:
        leal    EXT_PZRO,%a1    |answer is positive zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     end_unfr
uEXT_RP:
        tstb    LOCAL_SGN(%a0)  |if negative underflow
        beqs    ue_rp_pos
ue_rp_neg:
        leal    EXT_PZRO,%a1    |answer is negative zero
        oril    #negz_mask,USER_FPSR(%a6)
        bra     end_unfr
ue_rp_pos:
        leal    EXT_PSML,%a1    |answer is positive smallest denorm
        bra     end_unfr
|
|case DEST_FMT = DBL
|
uDBL_RN:
        leal    DBL_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     uset_sign
uDBL_RZ:
        leal    DBL_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     uset_sign       |now go set the sign
uDBL_RM:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    ud_rm_pos
ud_rm_neg:
        leal    DBL_PSML,%a1    |answer is smallest denormalized negative
        bsetb   #neg_bit,FPSR_CC(%a6)
        bra     end_unfr
ud_rm_pos:
        leal    DBL_PZRO,%a1    |answer is positive zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bra     end_unfr
uDBL_RP:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    ud_rp_pos
ud_rp_neg:
        leal    DBL_PZRO,%a1    |answer is negative zero
        oril    #negz_mask,USER_FPSR(%a6)
        bra     end_unfr
ud_rp_pos:
        leal    DBL_PSML,%a1    |answer is smallest denormalized negative
        bra     end_unfr
|
|case DEST_FMT = SGL
|
uSGL_RN:
        leal    SGL_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bras    uset_sign
uSGL_RZ:
        leal    SGL_PZRO,%a1    |answer is +/- zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bras    uset_sign
uSGL_RM:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    us_rm_pos
us_rm_neg:
        leal    SGL_PSML,%a1    |answer is smallest denormalized negative
        bsetb   #neg_bit,FPSR_CC(%a6)
        bras    end_unfr
us_rm_pos:
        leal    SGL_PZRO,%a1    |answer is positive zero
        bsetb   #z_bit,FPSR_CC(%a6)
        bras    end_unfr
uSGL_RP:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    us_rp_pos
us_rp_neg:
        leal    SGL_PZRO,%a1    |answer is negative zero
        oril    #negz_mask,USER_FPSR(%a6)
        bras    end_unfr
us_rp_pos:
        leal    SGL_PSML,%a1    |answer is smallest denormalized positive
        bras    end_unfr

uset_sign:
        tstb    LOCAL_SGN(%a0)  |if negative overflow
        beqs    end_unfr
uneg_sign:
        bsetb   #neg_bit,FPSR_CC(%a6)

end_unfr:
        movew   LOCAL_EX(%a1),LOCAL_EX(%a0) |be careful not to overwrite sign
        movel   LOCAL_HI(%a1),LOCAL_HI(%a0)
        movel   LOCAL_LO(%a1),LOCAL_LO(%a0)
        rts
|
|       reg_dest --- write byte, word, or long data to Dn
|
|
| Input:
|       L_SCR1: Data 
|       d1:     data size and dest register number formatted as:
|
|       32              5    4     3     2     1     0
|       -----------------------------------------------
|       |        0        |    Size   |  Dest Reg #   |
|       -----------------------------------------------
|
|       Size is:
|               0 - Byte
|               1 - Word
|               2 - Long/Single
|
pregdst:
        .long   byte_d0
        .long   byte_d1
        .long   byte_d2
        .long   byte_d3
        .long   byte_d4
        .long   byte_d5
        .long   byte_d6
        .long   byte_d7
        .long   word_d0
        .long   word_d1
        .long   word_d2
        .long   word_d3
        .long   word_d4
        .long   word_d5
        .long   word_d6
        .long   word_d7
        .long   long_d0
        .long   long_d1
        .long   long_d2
        .long   long_d3
        .long   long_d4
        .long   long_d5
        .long   long_d6
        .long   long_d7

reg_dest:
        leal    pregdst,%a0
        movel   %a0@(%d1:l:4),%a0
        jmp     (%a0)

byte_d0:
        moveb   L_SCR1(%a6),USER_D0+3(%a6)
        rts
byte_d1:
        moveb   L_SCR1(%a6),USER_D1+3(%a6)
        rts
byte_d2:
        moveb   L_SCR1(%a6),%d2
        rts
byte_d3:
        moveb   L_SCR1(%a6),%d3
        rts
byte_d4:
        moveb   L_SCR1(%a6),%d4
        rts
byte_d5:
        moveb   L_SCR1(%a6),%d5
        rts
byte_d6:
        moveb   L_SCR1(%a6),%d6
        rts
byte_d7:
        moveb   L_SCR1(%a6),%d7
        rts
word_d0:
        movew   L_SCR1(%a6),USER_D0+2(%a6)
        rts
word_d1:
        movew   L_SCR1(%a6),USER_D1+2(%a6)
        rts
word_d2:
        movew   L_SCR1(%a6),%d2
        rts
word_d3:
        movew   L_SCR1(%a6),%d3
        rts
word_d4:
        movew   L_SCR1(%a6),%d4
        rts
word_d5:
        movew   L_SCR1(%a6),%d5
        rts
word_d6:
        movew   L_SCR1(%a6),%d6
        rts
word_d7:
        movew   L_SCR1(%a6),%d7
        rts
long_d0:
        movel   L_SCR1(%a6),USER_D0(%a6)
        rts
long_d1:
        movel   L_SCR1(%a6),USER_D1(%a6)
        rts
long_d2:
        movel   L_SCR1(%a6),%d2
        rts
long_d3:
        movel   L_SCR1(%a6),%d3
        rts
long_d4:
        movel   L_SCR1(%a6),%d4
        rts
long_d5:
        movel   L_SCR1(%a6),%d5
        rts
long_d6:
        movel   L_SCR1(%a6),%d6
        rts
long_d7:
        movel   L_SCR1(%a6),%d7
        rts
        |end