* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
* M68000 Hi-Performance Microprocessor Division
* M68040 Software Package
*
* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
* All rights reserved.
*
* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
* To the maximum extent permitted by applicable law,
* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
* PARTICULAR PURPOSE and any warranty against infringement with
* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
* and any accompanying written materials.
*
* To the maximum extent permitted by applicable law,
* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
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* and support of the SOFTWARE.
*
* You are hereby granted a copyright license to use, modify, and
* distribute the SOFTWARE so long as this entire notice is retained
* without alteration in any modified and/or redistributed versions,
* and that such modified versions are clearly identified as such.
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* under any patents or trademarks of Motorola, Inc.
*
* DYADIC.GEN 1.2 4/30/91
*
* DYADIC.GEN --- generic DYADIC template
*
* This version saves all registers that will be used by the emulation
* routines and restores all but FP0 on exit. The FPSR is
* updated to reflect the result of the operation. Return value
* is placed in FP0 for single, double and extended results.
*
* The package subroutines expect the incoming FPCR to be zeroed
* since they need extended precision to work properly. The
* 'final' FPCR is expected in USER_FPCR(a6) so that the calculated result
* can be properly sized and rounded. Also, if the incoming FPCR
* has enabled any exceptions, the exception will be taken on the
* final fmovem in this template.
*
* Customizations:
* 1. Remove the movem.l at the entry and exit of
* each routine if your compiler treats those
* registers as scratch.
* 2. Likewise, don't save FP0/FP1 if they are scratch
* registers.
* 3. Delete updating of the fpsr if you only care about
* the result.
* 4. Remove the _OPs_ and _OPx_ entry points if your compiler
* treats everything as doubles.
* 5. Move the result to d0/d1 if the compiler is that old.
*
xref _OPa_
xref tag
xdef _OPs_
_OPs_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmovem.l fpsr/fpcr,USER_FPSR(a6) ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input arguments
*
fmove.s 8(a6),fp0
fmove.x fp0,FPTEMP(a6)
lea FPTEMP(a6),a0
bsr tag
move.b d0,DTAG(a6)
fmove.s 12(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
bsr _OPa_
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
swap.w d0
or.b FPSR_QBYTE(a6),d0 ; pickup sign of quotient byte
swap.w d0
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
unlk a6
rts
xdef _OPd_
_OPd_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmovem.l fpsr/fpcr,USER_FPSR(a6) ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input arguments
*
fmove.d 8(a6),fp0
fmove.x fp0,FPTEMP(a6)
lea FPTEMP(a6),a0
bsr tag
move.b d0,DTAG(a6)
fmove.d 16(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
bsr _OPa_
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
swap.w d0
or.b FPSR_QBYTE(a6),d0 ; pickup sign of quotient byte
swap.w d0
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
unlk a6
rts
xdef _OPx_
_OPx_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmovem.l fpsr/fpcr,USER_FPSR(a6) ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input arguments
*
fmove.x 8(a6),fp0
fmove.x fp0,FPTEMP(a6)
lea FPTEMP(a6),a0
bsr tag
move.b d0,DTAG(a6)
fmove.x 20(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
bsr _OPa_
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
swap.w d0
or.b FPSR_QBYTE(a6),d0 ; pickup sign of quotient byte
swap.w d0
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
unlk a6
rts
