/*
* fp_scan . S
*
* Copyright Roman Zippel , 1997 . All rights reserved .
*
* Redistribution and use in source and binary forms , with or without
* modification , are permitted provided that the following conditions
* are met :
* 1 . Redistributions of source code must retain the above copyright
* notice , and the entire permission notice in its entirety ,
* including the disclaimer of warranties .
* 2 . Redistributions in binary form must reproduce the above copyright
* notice , this list of conditions and the following disclaimer in the
* documentation and / or other materials provided with the distribution .
* 3 . The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission .
*
* ALTERNATIVELY , this product may be distributed under the terms of
* the GNU General Public License , in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions . ( This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD - style copyright . )
*
* THIS SOFTWARE IS PROVIDED ` ` AS IS ' ' AND ANY EXPRESS OR IMPLIED
* WARRANTIES , INCLUDING , BUT NOT LIMITED TO , THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED . IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT ,
* INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES
* ( INCLUDING , BUT NOT LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES ; LOSS OF USE , DATA , OR PROFITS ; OR BUSINESS INTERRUPTION )
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY , WHETHER IN CONTRACT ,
* STRICT LIABILITY , OR TORT ( INCLUDING NEGLIGENCE OR OTHERWISE )
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE , EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE .
*/
#include "fp_emu.h"
#include "fp_decode.h"
.globl fp_scan, fp_datasize
.data
| %d2 - first two instr words
| %d1 - operand size
/* operand formats are:
Long = 0 , i . e . fmove . l
Single , i . e . fmove . s
Extended , i . e . fmove . x
Packed - BCD , i . e . fmove . p
Word , i . e . fmove . w
Double , i . e . fmove . d
*/
.text
| On entry:
| FPDATA - base of emulated FPU registers
fp_scan:
| normal fpu instruction? (this excludes fsave/frestore)
fp_get_pc %a0
printf PDECODE,"%08x: " ,1 ,%a0
getuser.b (%a0),%d0,fp_err_ua1,%a0
#if 1
cmp.b #0 xf2,%d0 | cpid = 1
#else
cmp.b #0 xfc,%d0 | cpid = 6
#endif
jne fp_nonstd
| first two instruction words are kept in %d2
getuser.l (%a0)+,%d2,fp_err_ua1,%a0
fp_put_pc %a0
fp_decode_cond: | separate conditional instr
fp_decode_cond_instr_type
.long fp_decode_move, fp_fscc
.long fp_fbccw, fp_fbccl
fp_decode_move: | separate move instr
fp_decode_move_instr_type
.long fp_fgen_fp, fp_ill
.long fp_fgen_ea, fp_fmove_fp2mem
.long fp_fmovem_cr, fp_fmovem_cr
.long fp_fmovem_fp, fp_fmovem_fp
| now all arithmetic instr and a few move instr are left
fp_fgen_fp: | source is a fpu register
clr .b (FPD_FPSR+2 ,FPDATA) | clear the exception byte
fp_decode_sourcespec
printf PDECODE,"f<op>.x fp%d" ,1 ,%d0
fp_get_fp_reg
lea (FPD_TEMPFP1,FPDATA),%a1 | copy src into a temp location
move.l (%a0)+,(%a1)+
move.l (%a0)+,(%a1)+
move.l (%a0),(%a1)
lea (-8 ,%a1),%a0
jra fp_getdest
fp_fgen_ea: | source is <ea>
clr .b (FPD_FPSR+2 ,FPDATA) | clear the exception byte
| sort out fmovecr, keep data size in %d1
fp_decode_sourcespec
cmp.w #7 ,%d0
jeq fp_fmovecr
move.w %d0,%d1 | store data size twice in %d1
swap %d1 | one can be trashed below
move.w %d0,%d1
#ifdef FPU_EMU_DEBUG
lea 0 f,%a0
clr .l %d0
move.b (%a0,%d1.w),%d0
printf PDECODE,"f<op>.%c " ,1 ,%d0
.data
0 : .byte 'l' ,'s' ,'x' ,'p' ,'w' ,'d' ,'b' ,0
.previous
#endif
/*
fp_getsource , fp_getdest
basically , we end up with a pointer to the source operand in
% a1 , and a pointer to the destination operand in % a0 . both
are , of course , 96 - bit extended floating point numbers .
*/
fp_getsource:
| decode addressing mode for source
fp_decode_addr_mode
.long fp_data, fp_ill
.long fp_indirect, fp_postinc
.long fp_predecr, fp_disp16
.long fp_extmode0, fp_extmode1
| addressing mode: data register direct
fp_data:
fp_mode_data_direct
jsr fp_get_data_reg
lea (FPD_TEMPFP1,FPDATA),%a0
jmp ([0 f:w,%pc,%d1.w*4 ])
.align 4
0 :
.long fp_data_long, fp_data_single
.long fp_ill, fp_ill
.long fp_data_word, fp_ill
.long fp_data_byte, fp_ill
| data types that fit in an integer data register
fp_data_byte:
extb.l %d0
jra fp_data_long
fp_data_word:
ext.l %d0
fp_data_long:
jsr fp_conv_long2ext
jra fp_getdest
fp_data_single:
jsr fp_conv_single2ext
jra fp_getdest
| addressing mode: address register indirect
fp_indirect:
fp_mode_addr_indirect
jra fp_fetchsource
| addressing mode: address register indirect with postincrement
fp_postinc:
fp_mode_addr_indirect_postinc
jra fp_fetchsource
| addressing mode: address register indirect with predecrement
fp_predecr:
fp_mode_addr_indirect_predec
jra fp_fetchsource
| addressing mode: address register/programm counter indirect
| with 16 bit displacement
fp_disp16:
fp_mode_addr_indirect_disp16
jra fp_fetchsource
| all other indirect addressing modes will finally end up here
fp_extmode0:
fp_mode_addr_indirect_extmode0
jra fp_fetchsource
| all pc relative addressing modes and immediate/absolute modes end up here
| the first ones are sent to fp_extmode0 or fp_disp16
| and only the latter are handled here
fp_extmode1:
fp_decode_addr_reg
jmp ([0 f:w,%pc,%d0*4 ])
.align 4
0 :
.long fp_abs_short, fp_abs_long
.long fp_disp16, fp_extmode0
.long fp_immediate, fp_ill
.long fp_ill, fp_ill
| addressing mode: absolute short
fp_abs_short:
fp_mode_abs_short
jra fp_fetchsource
| addressing mode: absolute long
fp_abs_long:
fp_mode_abs_long
jra fp_fetchsource
| addressing mode: immediate data
fp_immediate:
printf PDECODE,"#"
fp_get_pc %a0
move.w (fp_datasize,%d1.w*2 ),%d0
addq.w #1 ,%d0
and.w #-2 ,%d0
#ifdef FPU_EMU_DEBUG
movem.l %d0/%d1,-(%sp)
movel %a0,%a1
clr .l %d1
jra 2 f
1 : getuser.b (%a1)+,%d1,fp_err_ua1,%a1
printf PDECODE,"%02x" ,1 ,%d1
2 : dbra %d0,1 b
movem.l (%sp)+,%d0/%d1
#endif
lea (%a0,%d0.w),%a1
fp_put_pc %a1
| jra fp_fetchsource
fp_fetchsource:
move.l %a0,%a1
swap %d1
lea (FPD_TEMPFP1,FPDATA),%a0
jmp ([0 f:w,%pc,%d1.w*4 ])
.align 4
0 : .long fp_long, fp_single
.long fp_ext, fp_pack
.long fp_word, fp_double
.long fp_byte, fp_ill
fp_long:
getuser.l (%a1),%d0,fp_err_ua1,%a1
jsr fp_conv_long2ext
jra fp_getdest
fp_single:
getuser.l (%a1),%d0,fp_err_ua1,%a1
jsr fp_conv_single2ext
jra fp_getdest
fp_ext:
getuser.l (%a1)+,%d0,fp_err_ua1,%a1
lsr.l #8 ,%d0
lsr.l #7 ,%d0
lsr.w #1 ,%d0
move.l %d0,(%a0)+
getuser.l (%a1)+,%d0,fp_err_ua1,%a1
move.l %d0,(%a0)+
getuser.l (%a1),%d0,fp_err_ua1,%a1
move.l %d0,(%a0)
subq.l #8 ,%a0
jra fp_getdest
fp_pack:
/* not supported yet */
jra fp_ill
fp_word:
getuser.w (%a1),%d0,fp_err_ua1,%a1
ext.l %d0
jsr fp_conv_long2ext
jra fp_getdest
fp_double:
jsr fp_conv_double2ext
jra fp_getdest
fp_byte:
getuser.b (%a1),%d0,fp_err_ua1,%a1
extb.l %d0
jsr fp_conv_long2ext
| jra fp_getdest
fp_getdest:
move.l %a0,%a1
bfextu %d2{#22 ,#3 },%d0
printf PDECODE,",fp%d\n" ,1 ,%d0
fp_get_fp_reg
movem.l %a0/%a1,-(%sp)
pea fp_finalrounding
bfextu %d2{#25 ,#7 },%d0
jmp ([0 f:w,%pc,%d0*4 ])
.align 4
0 :
.long fp_fmove_mem2fp, fp_fint, fp_fsinh, fp_fintrz
.long fp_fsqrt, fp_ill, fp_flognp1, fp_ill
.long fp_fetoxm1, fp_ftanh, fp_fatan, fp_ill
.long fp_fasin, fp_fatanh, fp_fsin, fp_ftan
.long fp_fetox, fp_ftwotox, fp_ftentox, fp_ill
.long fp_flogn, fp_flog10, fp_flog2, fp_ill
.long fp_fabs, fp_fcosh, fp_fneg, fp_ill
.long fp_facos, fp_fcos, fp_fgetexp, fp_fgetman
.long fp_fdiv, fp_fmod, fp_fadd, fp_fmul
.long fpa_fsgldiv, fp_frem, fp_fscale, fpa_fsglmul
.long fp_fsub, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_fsincos0, fp_fsincos1, fp_fsincos2, fp_fsincos3
.long fp_fsincos4, fp_fsincos5, fp_fsincos6, fp_fsincos7
.long fp_fcmp, fp_ill, fp_ftst, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_fsmove, fp_fssqrt, fp_ill, fp_ill
.long fp_fdmove, fp_fdsqrt, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_fsabs, fp_ill, fp_fsneg, fp_ill
.long fp_fdabs, fp_ill, fp_fdneg, fp_ill
.long fp_fsdiv, fp_ill, fp_fsadd, fp_fsmul
.long fp_fddiv, fp_ill, fp_fdadd, fp_fdmul
.long fp_fssub, fp_ill, fp_ill, fp_ill
.long fp_fdsub, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
.long fp_ill, fp_ill, fp_ill, fp_ill
| Instructions follow
| Move an (emulated) ROM constant
fp_fmovecr:
bfextu %d2{#27 ,#5 },%d0
printf PINSTR,"fp_fmovecr #%d" ,1 ,%d0
move.l %d0,%d1
add.l %d0,%d0
add.l %d1,%d0
lea (fp_constants,%d0*4 ),%a0
move.l #0 x801cc0ff,%d0
addq.l #1 ,%d1
lsl.l %d1,%d0
jcc 1 f
fp_set_sr FPSR_EXC_INEX2 | INEX2 exception
1 : moveq #-128 ,%d0 | continue with fmove
and.l %d0,%d2
jra fp_getdest
.data
.align 4
fp_constants:
.long 0 x00004000,0 xc90fdaa2,0 x2168c235 | pi
.extend 0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0
.long 0 x00003ffd,0 x9a209a84,0 xfbcff798 | log10(2 )
.long 0 x00004000,0 xadf85458,0 xa2bb4a9a | e
.long 0 x00003fff,0 xb8aa3b29,0 x5c17f0bc | log2(e)
.long 0 x00003ffd,0 xde5bd8a9,0 x37287195 | log10(e)
.long 0 x00000000,0 x00000000,0 x00000000 | 0 .0
.long 0 x00003ffe,0 xb17217f7,0 xd1cf79ac | 1 n(2 )
.long 0 x00004000,0 x935d8ddd,0 xaaa8ac17 | 1 n(10 )
| read this as "1.0 * 2^0" - note the high bit in the mantissa
.long 0 x00003fff,0 x80000000,0 x00000000 | 10 ^0
.long 0 x00004002,0 xa0000000,0 x00000000 | 10 ^1
.long 0 x00004005,0 xc8000000,0 x00000000 | 10 ^2
.long 0 x0000400c,0 x9c400000,0 x00000000 | 10 ^4
.long 0 x00004019,0 xbebc2000,0 x00000000 | 10 ^8
.long 0 x00004034,0 x8e1bc9bf,0 x04000000 | 10 ^16
.long 0 x00004069,0 x9dc5ada8,0 x2b70b59e | 10 ^32
.long 0 x000040d3,0 xc2781f49,0 xffcfa6d5 | 10 ^64
.long 0 x000041a8,0 x93ba47c9,0 x80e98ce0 | 10 ^128
.long 0 x00004351,0 xaa7eebfb,0 x9df9de8e | 10 ^256
.long 0 x000046a3,0 xe319a0ae,0 xa60e91c7 | 10 ^512
.long 0 x00004d48,0 xc9767586,0 x81750c17 | 10 ^1024
.long 0 x00005a92,0 x9e8b3b5d,0 xc53d5de5 | 10 ^2048
.long 0 x00007525,0 xc4605202,0 x8a20979b | 10 ^4096
.previous
fp_fmove_mem2fp:
printf PINSTR,"fmove %p,%p\n" ,2 ,%a0,%a1
move.l (%a1)+,(%a0)+
move.l (%a1)+,(%a0)+
move.l (%a1),(%a0)
subq.l #8 ,%a0
rts
fpa_fsglmul:
move.l #fp_finalrounding_single_fast,(%sp)
jra fp_fsglmul
fpa_fsgldiv:
move.l #fp_finalrounding_single_fast,(%sp)
jra fp_fsgldiv
.macro fp_dosingleprec instr
printf PINSTR,"single "
move.l #fp_finalrounding_single,(%sp)
jra \instr
.endm
.macro fp_dodoubleprec instr
printf PINSTR,"double "
move.l #fp_finalrounding_double,(%sp)
jra \instr
.endm
fp_fsmove:
fp_dosingleprec fp_fmove_mem2fp
fp_fssqrt:
fp_dosingleprec fp_fsqrt
fp_fdmove:
fp_dodoubleprec fp_fmove_mem2fp
fp_fdsqrt:
fp_dodoubleprec fp_fsqrt
fp_fsabs:
fp_dosingleprec fp_fabs
fp_fsneg:
fp_dosingleprec fp_fneg
fp_fdabs:
fp_dodoubleprec fp_fabs
fp_fdneg:
fp_dodoubleprec fp_fneg
fp_fsdiv:
fp_dosingleprec fp_fdiv
fp_fsadd:
fp_dosingleprec fp_fadd
fp_fsmul:
fp_dosingleprec fp_fmul
fp_fddiv:
fp_dodoubleprec fp_fdiv
fp_fdadd:
fp_dodoubleprec fp_fadd
fp_fdmul:
fp_dodoubleprec fp_fmul
fp_fssub:
fp_dosingleprec fp_fsub
fp_fdsub:
fp_dodoubleprec fp_fsub
fp_nonstd:
fp_get_pc %a0
getuser.l (%a0),%d0,fp_err_ua1,%a0
printf ,"nonstd ((%08x)=%08x)\n" ,2 ,%a0,%d0
moveq #-1 ,%d0
rts
.data
.align 4
| data sizes corresponding to the operand formats
fp_datasize:
.word 4 , 4 , 12 , 12 , 2 , 8 , 1 , 0
Messung V0.5 in Prozent C=95 H=95 G=94
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(vorverarbeitet am 2026-09-28)
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