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478 lines
11 KiB
478 lines
11 KiB
/* |
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* fp_scan.S |
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* |
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* Copyright Roman Zippel, 1997. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, and the entire permission notice in its entirety, |
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* including the disclaimer of warranties. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* ALTERNATIVELY, this product may be distributed under the terms of |
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* the GNU General Public License, in which case the provisions of the GPL are |
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* required INSTEAD OF the above restrictions. (This clause is |
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* necessary due to a potential bad interaction between the GPL and |
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* the restrictions contained in a BSD-style copyright.) |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "fp_emu.h" |
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#include "fp_decode.h" |
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.globl fp_scan, fp_datasize |
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.data |
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| %d2 - first two instr words |
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| %d1 - operand size |
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/* operand formats are: |
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Long = 0, i.e. fmove.l |
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Single, i.e. fmove.s |
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Extended, i.e. fmove.x |
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Packed-BCD, i.e. fmove.p |
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Word, i.e. fmove.w |
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Double, i.e. fmove.d |
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*/ |
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.text |
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|
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| On entry: |
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| FPDATA - base of emulated FPU registers |
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fp_scan: |
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| normal fpu instruction? (this excludes fsave/frestore) |
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fp_get_pc %a0 |
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printf PDECODE,"%08x: ",1,%a0 |
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getuser.b (%a0),%d0,fp_err_ua1,%a0 |
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#if 1 |
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cmp.b #0xf2,%d0 | cpid = 1 |
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#else |
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cmp.b #0xfc,%d0 | cpid = 6 |
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#endif |
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jne fp_nonstd |
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| first two instruction words are kept in %d2 |
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getuser.l (%a0)+,%d2,fp_err_ua1,%a0 |
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fp_put_pc %a0 |
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fp_decode_cond: | separate conditional instr |
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fp_decode_cond_instr_type |
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.long fp_decode_move, fp_fscc |
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.long fp_fbccw, fp_fbccl |
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fp_decode_move: | separate move instr |
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fp_decode_move_instr_type |
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.long fp_fgen_fp, fp_ill |
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.long fp_fgen_ea, fp_fmove_fp2mem |
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.long fp_fmovem_cr, fp_fmovem_cr |
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.long fp_fmovem_fp, fp_fmovem_fp |
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| now all arithmetic instr and a few move instr are left |
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fp_fgen_fp: | source is a fpu register |
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clr.b (FPD_FPSR+2,FPDATA) | clear the exception byte |
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fp_decode_sourcespec |
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printf PDECODE,"f<op>.x fp%d",1,%d0 |
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fp_get_fp_reg |
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lea (FPD_TEMPFP1,FPDATA),%a1 | copy src into a temp location |
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move.l (%a0)+,(%a1)+ |
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move.l (%a0)+,(%a1)+ |
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move.l (%a0),(%a1) |
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lea (-8,%a1),%a0 |
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jra fp_getdest |
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fp_fgen_ea: | source is <ea> |
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clr.b (FPD_FPSR+2,FPDATA) | clear the exception byte |
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| sort out fmovecr, keep data size in %d1 |
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fp_decode_sourcespec |
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cmp.w #7,%d0 |
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jeq fp_fmovecr |
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move.w %d0,%d1 | store data size twice in %d1 |
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swap %d1 | one can be trashed below |
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move.w %d0,%d1 |
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#ifdef FPU_EMU_DEBUG |
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lea 0f,%a0 |
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clr.l %d0 |
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move.b (%a0,%d1.w),%d0 |
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printf PDECODE,"f<op>.%c ",1,%d0 |
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.data |
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0: .byte 'l','s','x','p','w','d','b',0 |
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.previous |
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#endif |
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/* |
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fp_getsource, fp_getdest |
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basically, we end up with a pointer to the source operand in |
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%a1, and a pointer to the destination operand in %a0. both |
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are, of course, 96-bit extended floating point numbers. |
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*/ |
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fp_getsource: |
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| decode addressing mode for source |
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fp_decode_addr_mode |
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.long fp_data, fp_ill |
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.long fp_indirect, fp_postinc |
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.long fp_predecr, fp_disp16 |
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.long fp_extmode0, fp_extmode1 |
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| addressing mode: data register direct |
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fp_data: |
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fp_mode_data_direct |
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jsr fp_get_data_reg |
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lea (FPD_TEMPFP1,FPDATA),%a0 |
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jmp ([0f:w,%pc,%d1.w*4]) |
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.align 4 |
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0: |
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.long fp_data_long, fp_data_single |
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.long fp_ill, fp_ill |
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.long fp_data_word, fp_ill |
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.long fp_data_byte, fp_ill |
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| data types that fit in an integer data register |
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fp_data_byte: |
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extb.l %d0 |
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jra fp_data_long |
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fp_data_word: |
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ext.l %d0 |
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fp_data_long: |
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jsr fp_conv_long2ext |
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jra fp_getdest |
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fp_data_single: |
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jsr fp_conv_single2ext |
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jra fp_getdest |
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| addressing mode: address register indirect |
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fp_indirect: |
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fp_mode_addr_indirect |
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jra fp_fetchsource |
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| addressing mode: address register indirect with postincrement |
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fp_postinc: |
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fp_mode_addr_indirect_postinc |
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jra fp_fetchsource |
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| addressing mode: address register indirect with predecrement |
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fp_predecr: |
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fp_mode_addr_indirect_predec |
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jra fp_fetchsource |
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| addressing mode: address register/programm counter indirect |
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| with 16bit displacement |
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fp_disp16: |
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fp_mode_addr_indirect_disp16 |
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jra fp_fetchsource |
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| all other indirect addressing modes will finally end up here |
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fp_extmode0: |
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fp_mode_addr_indirect_extmode0 |
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jra fp_fetchsource |
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| all pc relative addressing modes and immediate/absolute modes end up here |
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| the first ones are sent to fp_extmode0 or fp_disp16 |
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| and only the latter are handled here |
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fp_extmode1: |
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fp_decode_addr_reg |
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jmp ([0f:w,%pc,%d0*4]) |
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.align 4 |
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0: |
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.long fp_abs_short, fp_abs_long |
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.long fp_disp16, fp_extmode0 |
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.long fp_immediate, fp_ill |
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.long fp_ill, fp_ill |
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| addressing mode: absolute short |
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fp_abs_short: |
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fp_mode_abs_short |
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jra fp_fetchsource |
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| addressing mode: absolute long |
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fp_abs_long: |
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fp_mode_abs_long |
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jra fp_fetchsource |
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| addressing mode: immediate data |
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fp_immediate: |
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printf PDECODE,"#" |
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fp_get_pc %a0 |
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move.w (fp_datasize,%d1.w*2),%d0 |
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addq.w #1,%d0 |
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and.w #-2,%d0 |
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#ifdef FPU_EMU_DEBUG |
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movem.l %d0/%d1,-(%sp) |
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movel %a0,%a1 |
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clr.l %d1 |
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jra 2f |
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1: getuser.b (%a1)+,%d1,fp_err_ua1,%a1 |
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printf PDECODE,"%02x",1,%d1 |
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2: dbra %d0,1b |
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movem.l (%sp)+,%d0/%d1 |
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#endif |
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lea (%a0,%d0.w),%a1 |
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fp_put_pc %a1 |
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| jra fp_fetchsource |
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fp_fetchsource: |
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move.l %a0,%a1 |
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swap %d1 |
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lea (FPD_TEMPFP1,FPDATA),%a0 |
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jmp ([0f:w,%pc,%d1.w*4]) |
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.align 4 |
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0: .long fp_long, fp_single |
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.long fp_ext, fp_pack |
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.long fp_word, fp_double |
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.long fp_byte, fp_ill |
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fp_long: |
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getuser.l (%a1),%d0,fp_err_ua1,%a1 |
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jsr fp_conv_long2ext |
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jra fp_getdest |
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fp_single: |
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getuser.l (%a1),%d0,fp_err_ua1,%a1 |
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jsr fp_conv_single2ext |
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jra fp_getdest |
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fp_ext: |
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getuser.l (%a1)+,%d0,fp_err_ua1,%a1 |
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lsr.l #8,%d0 |
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lsr.l #7,%d0 |
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lsr.w #1,%d0 |
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move.l %d0,(%a0)+ |
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getuser.l (%a1)+,%d0,fp_err_ua1,%a1 |
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move.l %d0,(%a0)+ |
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getuser.l (%a1),%d0,fp_err_ua1,%a1 |
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move.l %d0,(%a0) |
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subq.l #8,%a0 |
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jra fp_getdest |
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fp_pack: |
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/* not supported yet */ |
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jra fp_ill |
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fp_word: |
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getuser.w (%a1),%d0,fp_err_ua1,%a1 |
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ext.l %d0 |
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jsr fp_conv_long2ext |
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jra fp_getdest |
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fp_double: |
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jsr fp_conv_double2ext |
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jra fp_getdest |
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fp_byte: |
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getuser.b (%a1),%d0,fp_err_ua1,%a1 |
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extb.l %d0 |
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jsr fp_conv_long2ext |
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| jra fp_getdest |
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fp_getdest: |
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move.l %a0,%a1 |
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bfextu %d2{#22,#3},%d0 |
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printf PDECODE,",fp%d\n",1,%d0 |
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fp_get_fp_reg |
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movem.l %a0/%a1,-(%sp) |
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pea fp_finalrounding |
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bfextu %d2{#25,#7},%d0 |
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jmp ([0f:w,%pc,%d0*4]) |
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.align 4 |
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0: |
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.long fp_fmove_mem2fp, fp_fint, fp_fsinh, fp_fintrz |
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.long fp_fsqrt, fp_ill, fp_flognp1, fp_ill |
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.long fp_fetoxm1, fp_ftanh, fp_fatan, fp_ill |
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.long fp_fasin, fp_fatanh, fp_fsin, fp_ftan |
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.long fp_fetox, fp_ftwotox, fp_ftentox, fp_ill |
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.long fp_flogn, fp_flog10, fp_flog2, fp_ill |
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.long fp_fabs, fp_fcosh, fp_fneg, fp_ill |
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.long fp_facos, fp_fcos, fp_fgetexp, fp_fgetman |
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.long fp_fdiv, fp_fmod, fp_fadd, fp_fmul |
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.long fpa_fsgldiv, fp_frem, fp_fscale, fpa_fsglmul |
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.long fp_fsub, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_fsincos0, fp_fsincos1, fp_fsincos2, fp_fsincos3 |
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.long fp_fsincos4, fp_fsincos5, fp_fsincos6, fp_fsincos7 |
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.long fp_fcmp, fp_ill, fp_ftst, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_fsmove, fp_fssqrt, fp_ill, fp_ill |
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.long fp_fdmove, fp_fdsqrt, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_fsabs, fp_ill, fp_fsneg, fp_ill |
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.long fp_fdabs, fp_ill, fp_fdneg, fp_ill |
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.long fp_fsdiv, fp_ill, fp_fsadd, fp_fsmul |
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.long fp_fddiv, fp_ill, fp_fdadd, fp_fdmul |
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.long fp_fssub, fp_ill, fp_ill, fp_ill |
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.long fp_fdsub, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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.long fp_ill, fp_ill, fp_ill, fp_ill |
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| Instructions follow |
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| Move an (emulated) ROM constant |
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fp_fmovecr: |
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bfextu %d2{#27,#5},%d0 |
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printf PINSTR,"fp_fmovecr #%d",1,%d0 |
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move.l %d0,%d1 |
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add.l %d0,%d0 |
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add.l %d1,%d0 |
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lea (fp_constants,%d0*4),%a0 |
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move.l #0x801cc0ff,%d0 |
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addq.l #1,%d1 |
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lsl.l %d1,%d0 |
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jcc 1f |
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fp_set_sr FPSR_EXC_INEX2 | INEX2 exception |
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1: moveq #-128,%d0 | continue with fmove |
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and.l %d0,%d2 |
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jra fp_getdest |
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.data |
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.align 4 |
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fp_constants: |
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.long 0x00004000,0xc90fdaa2,0x2168c235 | pi |
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.extend 0,0,0,0,0,0,0,0,0,0 |
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.long 0x00003ffd,0x9a209a84,0xfbcff798 | log10(2) |
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.long 0x00004000,0xadf85458,0xa2bb4a9a | e |
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.long 0x00003fff,0xb8aa3b29,0x5c17f0bc | log2(e) |
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.long 0x00003ffd,0xde5bd8a9,0x37287195 | log10(e) |
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.long 0x00000000,0x00000000,0x00000000 | 0.0 |
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.long 0x00003ffe,0xb17217f7,0xd1cf79ac | 1n(2) |
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.long 0x00004000,0x935d8ddd,0xaaa8ac17 | 1n(10) |
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| read this as "1.0 * 2^0" - note the high bit in the mantissa |
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.long 0x00003fff,0x80000000,0x00000000 | 10^0 |
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.long 0x00004002,0xa0000000,0x00000000 | 10^1 |
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.long 0x00004005,0xc8000000,0x00000000 | 10^2 |
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.long 0x0000400c,0x9c400000,0x00000000 | 10^4 |
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.long 0x00004019,0xbebc2000,0x00000000 | 10^8 |
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.long 0x00004034,0x8e1bc9bf,0x04000000 | 10^16 |
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.long 0x00004069,0x9dc5ada8,0x2b70b59e | 10^32 |
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.long 0x000040d3,0xc2781f49,0xffcfa6d5 | 10^64 |
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.long 0x000041a8,0x93ba47c9,0x80e98ce0 | 10^128 |
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.long 0x00004351,0xaa7eebfb,0x9df9de8e | 10^256 |
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.long 0x000046a3,0xe319a0ae,0xa60e91c7 | 10^512 |
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.long 0x00004d48,0xc9767586,0x81750c17 | 10^1024 |
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.long 0x00005a92,0x9e8b3b5d,0xc53d5de5 | 10^2048 |
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.long 0x00007525,0xc4605202,0x8a20979b | 10^4096 |
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.previous |
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fp_fmove_mem2fp: |
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printf PINSTR,"fmove %p,%p\n",2,%a0,%a1 |
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move.l (%a1)+,(%a0)+ |
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move.l (%a1)+,(%a0)+ |
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move.l (%a1),(%a0) |
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subq.l #8,%a0 |
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rts |
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fpa_fsglmul: |
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move.l #fp_finalrounding_single_fast,(%sp) |
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jra fp_fsglmul |
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fpa_fsgldiv: |
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move.l #fp_finalrounding_single_fast,(%sp) |
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jra fp_fsgldiv |
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.macro fp_dosingleprec instr |
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printf PINSTR,"single " |
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move.l #fp_finalrounding_single,(%sp) |
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jra \instr |
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.endm |
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.macro fp_dodoubleprec instr |
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printf PINSTR,"double " |
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move.l #fp_finalrounding_double,(%sp) |
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jra \instr |
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.endm |
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fp_fsmove: |
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fp_dosingleprec fp_fmove_mem2fp |
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fp_fssqrt: |
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fp_dosingleprec fp_fsqrt |
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fp_fdmove: |
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fp_dodoubleprec fp_fmove_mem2fp |
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fp_fdsqrt: |
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fp_dodoubleprec fp_fsqrt |
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fp_fsabs: |
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fp_dosingleprec fp_fabs |
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fp_fsneg: |
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fp_dosingleprec fp_fneg |
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fp_fdabs: |
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fp_dodoubleprec fp_fabs |
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fp_fdneg: |
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fp_dodoubleprec fp_fneg |
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fp_fsdiv: |
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fp_dosingleprec fp_fdiv |
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fp_fsadd: |
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fp_dosingleprec fp_fadd |
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fp_fsmul: |
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fp_dosingleprec fp_fmul |
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fp_fddiv: |
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fp_dodoubleprec fp_fdiv |
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fp_fdadd: |
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fp_dodoubleprec fp_fadd |
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fp_fdmul: |
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fp_dodoubleprec fp_fmul |
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fp_fssub: |
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fp_dosingleprec fp_fsub |
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fp_fdsub: |
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fp_dodoubleprec fp_fsub |
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fp_nonstd: |
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fp_get_pc %a0 |
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getuser.l (%a0),%d0,fp_err_ua1,%a0 |
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printf ,"nonstd ((%08x)=%08x)\n",2,%a0,%d0 |
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moveq #-1,%d0 |
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rts |
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.data |
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.align 4 |
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| data sizes corresponding to the operand formats |
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fp_datasize: |
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.word 4, 4, 12, 12, 2, 8, 1, 0
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