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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 | /* * 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 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: | seperate conditional instr fp_decode_cond_instr_type .long fp_decode_move, fp_fscc .long fp_fbccw, fp_fbccl fp_decode_move: | seperate 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 |