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+/*
+ * 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 #0xf2,%d0 | cpid = 1
+#else
+ cmp.b #0xfc,%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 0f,%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 ([0f: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 16bit 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 ([0f: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 2f
+1: getuser.b (%a1)+,%d1,fp_err_ua1,%a1
+ printf PDECODE,"%02x",1,%d1
+2: dbra %d0,1b
+ 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 ([0f: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 ([0f: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 #0x801cc0ff,%d0
+ addq.l #1,%d1
+ lsl.l %d1,%d0
+ jcc 1f
+ 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 0x00004000,0xc90fdaa2,0x2168c235 | pi
+ .extend 0,0,0,0,0,0,0,0,0,0
+ .long 0x00003ffd,0x9a209a84,0xfbcff798 | log10(2)
+ .long 0x00004000,0xadf85458,0xa2bb4a9a | e
+ .long 0x00003fff,0xb8aa3b29,0x5c17f0bc | log2(e)
+ .long 0x00003ffd,0xde5bd8a9,0x37287195 | log10(e)
+ .long 0x00000000,0x00000000,0x00000000 | 0.0
+ .long 0x00003ffe,0xb17217f7,0xd1cf79ac | 1n(2)
+ .long 0x00004000,0x935d8ddd,0xaaa8ac17 | 1n(10)
+ | read this as "1.0 * 2^0" - note the high bit in the mantissa
+ .long 0x00003fff,0x80000000,0x00000000 | 10^0
+ .long 0x00004002,0xa0000000,0x00000000 | 10^1
+ .long 0x00004005,0xc8000000,0x00000000 | 10^2
+ .long 0x0000400c,0x9c400000,0x00000000 | 10^4
+ .long 0x00004019,0xbebc2000,0x00000000 | 10^8
+ .long 0x00004034,0x8e1bc9bf,0x04000000 | 10^16
+ .long 0x00004069,0x9dc5ada8,0x2b70b59e | 10^32
+ .long 0x000040d3,0xc2781f49,0xffcfa6d5 | 10^64
+ .long 0x000041a8,0x93ba47c9,0x80e98ce0 | 10^128
+ .long 0x00004351,0xaa7eebfb,0x9df9de8e | 10^256
+ .long 0x000046a3,0xe319a0ae,0xa60e91c7 | 10^512
+ .long 0x00004d48,0xc9767586,0x81750c17 | 10^1024
+ .long 0x00005a92,0x9e8b3b5d,0xc53d5de5 | 10^2048
+ .long 0x00007525,0xc4605202,0x8a20979b | 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