231 lines
5.9 KiB
Plaintext
231 lines
5.9 KiB
Plaintext
* $NetBSD: MONADIC.GEN,v 1.3 1994/10/26 07:48:42 cgd Exp $
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* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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* M68000 Hi-Performance Microprocessor Division
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* M68040 Software Package
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*
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* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
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* All rights reserved.
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*
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* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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* To the maximum extent permitted by applicable law,
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* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
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* PARTICULAR PURPOSE and any warranty against infringement with
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* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
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* and any accompanying written materials.
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*
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* To the maximum extent permitted by applicable law,
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* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
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* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
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* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
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* SOFTWARE. Motorola assumes no responsibility for the maintenance
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* and support of the SOFTWARE.
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*
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* You are hereby granted a copyright license to use, modify, and
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* distribute the SOFTWARE so long as this entire notice is retained
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* without alteration in any modified and/or redistributed versions,
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* and that such modified versions are clearly identified as such.
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* No licenses are granted by implication, estoppel or otherwise
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* under any patents or trademarks of Motorola, Inc.
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*
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* MONADIC.GEN 1.5 5/18/92
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*
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* MONADIC.GEN 1.4 1/16/92
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*
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* MONADIC.GEN 1.3 4/30/91
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*
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* MONADIC.GEN --- generic MONADIC template
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*
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* This version saves all registers that will be used by the emulation
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* routines and restores all but FP0 on exit. The FPSR is
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* updated to reflect the result of the operation. Return value
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* is placed in FP0 for single, double and extended results.
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*
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* The package subroutines expect the incoming FPCR to be zeroed
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* since they need extended precision to work properly. The
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* 'final' FPCR is expected in d1 so that the calculated result
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* can be properly sized and rounded. Also, if the incoming FPCR
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* has enabled any exceptions, the exception will be taken on the
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* final fmovem in this template.
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*
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* Customizations:
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* 1. Remove the movem.l at the entry and exit of
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* each routine if your compiler treats those
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* registers as scratch.
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* 2. Likewise, don't save FP0/FP1 if they are scratch
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* registers.
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* 3. Delete handling of the fpsr if you only care about
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* the result.
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* 4. Some (most?) C compilers convert all float arguments
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* to double, and provide no support at all for extended
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* precision so remove the _OPs_ and _OPx_ entry points.
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* 5. Move the result to d0/d1 if the compiler is that old.
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*
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xref tag
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xref _OPr_
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xref _OPz_
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xref _OPi_
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xref _OPn_
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xref _OPm_
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xdef _OPs_
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_OPs_:
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link a6,#-LOCAL_SIZE
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movem.l d0-d1/a0-a1,USER_DA(a6)
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fmovem.x fp0-fp3,USER_FP0(a6)
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fmove.l fpsr,USER_FPSR(a6)
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fmove.l fpcr,USER_FPCR(a6)
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fmove.l fpcr,d1 ; user's rounding mode/precision
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fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
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*
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* copy, convert and tag input argument
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*
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fmove.s 8(a6),fp0
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fmove.x fp0,ETEMP(a6)
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lea ETEMP(a6),a0
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bsr tag
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move.b d0,STAG(a6)
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tst.b d0
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bne.b _TMP_2
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bsr _OPr_ ; normalized (regular) number
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bra.b _TMP_6
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_TMP_2:
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cmp.b #$20,d0 ; zero?
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bne.b _TMP_3
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bsr _OPz_
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bra.b _TMP_6
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_TMP_3:
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cmp.b #$40,d0 ; infinity?
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bne.b _TMP_4
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bsr _OPi_
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bra.b _TMP_6
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_TMP_4:
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cmp.b #$60,d0 ; NaN?
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bne.b _TMP_5
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bsr _OPn_
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bra.b _TMP_6
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_TMP_5:
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bsr _OPm_ ; assuming a denorm...
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_TMP_6:
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fmove.l fpsr,d0 ; update status register
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or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
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fmove.l d0,fpsr
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*
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* Result is now in FP0
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*
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movem.l USER_DA(a6),d0-d1/a0-a1
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fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
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fmove.l USER_FPCR(a6),fpcr ; fpcr restored
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unlk a6
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rts
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xdef _OPd_
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_OPd_:
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link a6,#-LOCAL_SIZE
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movem.l d0-d1/a0-a1,USER_DA(a6)
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fmovem.x fp0-fp3,USER_FP0(a6)
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fmove.l fpsr,USER_FPSR(a6)
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fmove.l fpcr,USER_FPCR(a6)
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fmove.l fpcr,d1 ; user's rounding mode/precision
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fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
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*
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* copy, convert and tag input argument
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*
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fmove.d 8(a6),fp0
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fmove.x fp0,ETEMP(a6)
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lea ETEMP(a6),a0
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bsr tag
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move.b d0,STAG(a6)
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tst.b d0
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bne.b _TMP_7
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bsr _OPr_ ; normalized (regular) number
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bra.b _TMP_B
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_TMP_7:
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cmp.b #$20,d0 ; zero?
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bne.b _TMP_8
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bsr _OPz_
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bra.b _TMP_B
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_TMP_8:
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cmp.b #$40,d0 ; infinity?
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bne.b _TMP_9
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bsr _OPi_
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bra.b _TMP_B
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_TMP_9:
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cmp.b #$60,d0 ; NaN?
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bne.b _TMP_A
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bsr _OPn_
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bra.b _TMP_B
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_TMP_A:
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bsr _OPm_ ; assuming a denorm...
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_TMP_B:
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fmove.l fpsr,d0 ; update status register
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or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
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fmove.l d0,fpsr
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*
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* Result is now in FP0
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*
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movem.l USER_DA(a6),d0-d1/a0-a1
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fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
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fmove.l USER_FPCR(a6),fpcr ; fpcr restored
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unlk a6
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rts
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xdef _OPx_
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_OPx_:
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link a6,#-LOCAL_SIZE
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movem.l d0-d1/a0-a1,USER_DA(a6)
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fmovem.x fp0-fp3,USER_FP0(a6)
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fmove.l fpsr,USER_FPSR(a6)
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fmove.l fpcr,USER_FPCR(a6)
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fmove.l fpcr,d1 ; user's rounding mode/precision
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fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
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*
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* copy, convert and tag input argument
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*
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fmove.x 8(a6),fp0
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fmove.x fp0,ETEMP(a6)
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lea ETEMP(a6),a0
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bsr tag
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move.b d0,STAG(a6)
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tst.b d0
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bne.b _TMP_C
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bsr _OPr_ ; normalized (regular) number
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bra.b _TMP_G
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_TMP_C:
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cmp.b #$20,d0 ; zero?
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bne.b _TMP_D
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bsr _OPz_
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bra.b _TMP_G
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_TMP_D:
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cmp.b #$40,d0 ; infinity?
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bne.b _TMP_E
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bsr _OPi_
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bra.b _TMP_G
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_TMP_E:
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cmp.b #$60,d0 ; NaN?
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bne.b _TMP_F
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bsr _OPn_
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bra.b _TMP_G
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_TMP_F:
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bsr _OPm_ ; assuming a denorm...
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_TMP_G:
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fmove.l fpsr,d0 ; update status register
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or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
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fmove.l d0,fpsr
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*
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* Result is now in FP0
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*
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movem.l USER_DA(a6),d0-d1/a0-a1
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fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
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fmove.l USER_FPCR(a6),fpcr ; fpcr restored
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unlk a6
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rts
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