Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) |
| 3 | * |
| 4 | * Floating-point emulation code |
| 5 | * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | /* |
| 22 | * BEGIN_DESC |
| 23 | * |
| 24 | * File: |
| 25 | * @(#) pa/fp/fpudispatch.c $Revision: 1.1 $ |
| 26 | * |
| 27 | * Purpose: |
| 28 | * <<please update with a synopsis of the functionality provided by this file>> |
| 29 | * |
| 30 | * External Interfaces: |
| 31 | * <<the following list was autogenerated, please review>> |
| 32 | * emfpudispatch(ir, dummy1, dummy2, fpregs) |
| 33 | * fpudispatch(ir, excp_code, holder, fpregs) |
| 34 | * |
| 35 | * Internal Interfaces: |
| 36 | * <<the following list was autogenerated, please review>> |
| 37 | * static u_int decode_06(u_int, u_int *) |
| 38 | * static u_int decode_0c(u_int, u_int, u_int, u_int *) |
| 39 | * static u_int decode_0e(u_int, u_int, u_int, u_int *) |
| 40 | * static u_int decode_26(u_int, u_int *) |
| 41 | * static u_int decode_2e(u_int, u_int *) |
| 42 | * static void update_status_cbit(u_int *, u_int, u_int, u_int) |
| 43 | * |
| 44 | * Theory: |
| 45 | * <<please update with a overview of the operation of this file>> |
| 46 | * |
| 47 | * END_DESC |
| 48 | */ |
| 49 | |
| 50 | #define FPUDEBUG 0 |
| 51 | |
| 52 | #include "float.h" |
Paul Gortmaker | 50af5ea | 2012-01-20 18:35:53 -0500 | [diff] [blame] | 53 | #include <linux/bug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <linux/kernel.h> |
| 55 | #include <asm/processor.h> |
| 56 | /* #include <sys/debug.h> */ |
| 57 | /* #include <machine/sys/mdep_private.h> */ |
| 58 | |
| 59 | #define COPR_INST 0x30000000 |
| 60 | |
| 61 | /* |
| 62 | * definition of extru macro. If pos and len are constants, the compiler |
| 63 | * will generate an extru instruction when optimized |
| 64 | */ |
| 65 | #define extru(r,pos,len) (((r) >> (31-(pos))) & (( 1 << (len)) - 1)) |
| 66 | /* definitions of bit field locations in the instruction */ |
| 67 | #define fpmajorpos 5 |
| 68 | #define fpr1pos 10 |
| 69 | #define fpr2pos 15 |
| 70 | #define fptpos 31 |
| 71 | #define fpsubpos 18 |
| 72 | #define fpclass1subpos 16 |
| 73 | #define fpclasspos 22 |
| 74 | #define fpfmtpos 20 |
| 75 | #define fpdfpos 18 |
| 76 | #define fpnulpos 26 |
| 77 | /* |
| 78 | * the following are the extra bits for the 0E major op |
| 79 | */ |
| 80 | #define fpxr1pos 24 |
| 81 | #define fpxr2pos 19 |
| 82 | #define fpxtpos 25 |
| 83 | #define fpxpos 23 |
| 84 | #define fp0efmtpos 20 |
| 85 | /* |
| 86 | * the following are for the multi-ops |
| 87 | */ |
| 88 | #define fprm1pos 10 |
| 89 | #define fprm2pos 15 |
| 90 | #define fptmpos 31 |
| 91 | #define fprapos 25 |
| 92 | #define fptapos 20 |
| 93 | #define fpmultifmt 26 |
| 94 | /* |
| 95 | * the following are for the fused FP instructions |
| 96 | */ |
| 97 | /* fprm1pos 10 */ |
| 98 | /* fprm2pos 15 */ |
| 99 | #define fpraupos 18 |
| 100 | #define fpxrm2pos 19 |
| 101 | /* fpfmtpos 20 */ |
| 102 | #define fpralpos 23 |
| 103 | #define fpxrm1pos 24 |
| 104 | /* fpxtpos 25 */ |
| 105 | #define fpfusedsubop 26 |
| 106 | /* fptpos 31 */ |
| 107 | |
| 108 | /* |
| 109 | * offset to constant zero in the FP emulation registers |
| 110 | */ |
| 111 | #define fpzeroreg (32*sizeof(double)/sizeof(u_int)) |
| 112 | |
| 113 | /* |
| 114 | * extract the major opcode from the instruction |
| 115 | */ |
| 116 | #define get_major(op) extru(op,fpmajorpos,6) |
| 117 | /* |
| 118 | * extract the two bit class field from the FP instruction. The class is at bit |
| 119 | * positions 21-22 |
| 120 | */ |
| 121 | #define get_class(op) extru(op,fpclasspos,2) |
| 122 | /* |
| 123 | * extract the 3 bit subop field. For all but class 1 instructions, it is |
| 124 | * located at bit positions 16-18 |
| 125 | */ |
| 126 | #define get_subop(op) extru(op,fpsubpos,3) |
| 127 | /* |
| 128 | * extract the 2 or 3 bit subop field from class 1 instructions. It is located |
| 129 | * at bit positions 15-16 (PA1.1) or 14-16 (PA2.0) |
| 130 | */ |
| 131 | #define get_subop1_PA1_1(op) extru(op,fpclass1subpos,2) /* PA89 (1.1) fmt */ |
| 132 | #define get_subop1_PA2_0(op) extru(op,fpclass1subpos,3) /* PA 2.0 fmt */ |
| 133 | |
| 134 | /* definitions of unimplemented exceptions */ |
| 135 | #define MAJOR_0C_EXCP 0x09 |
| 136 | #define MAJOR_0E_EXCP 0x0b |
| 137 | #define MAJOR_06_EXCP 0x03 |
| 138 | #define MAJOR_26_EXCP 0x23 |
| 139 | #define MAJOR_2E_EXCP 0x2b |
| 140 | #define PA83_UNIMP_EXCP 0x01 |
| 141 | |
| 142 | /* |
| 143 | * Special Defines for TIMEX specific code |
| 144 | */ |
| 145 | |
| 146 | #define FPU_TYPE_FLAG_POS (EM_FPU_TYPE_OFFSET>>2) |
| 147 | #define TIMEX_ROLEX_FPU_MASK (TIMEX_EXTEN_FLAG|ROLEX_EXTEN_FLAG) |
| 148 | |
| 149 | /* |
| 150 | * Static function definitions |
| 151 | */ |
| 152 | #define _PROTOTYPES |
| 153 | #if defined(_PROTOTYPES) || defined(_lint) |
| 154 | static u_int decode_0c(u_int, u_int, u_int, u_int *); |
| 155 | static u_int decode_0e(u_int, u_int, u_int, u_int *); |
| 156 | static u_int decode_06(u_int, u_int *); |
| 157 | static u_int decode_26(u_int, u_int *); |
| 158 | static u_int decode_2e(u_int, u_int *); |
| 159 | static void update_status_cbit(u_int *, u_int, u_int, u_int); |
| 160 | #else /* !_PROTOTYPES&&!_lint */ |
| 161 | static u_int decode_0c(); |
| 162 | static u_int decode_0e(); |
| 163 | static u_int decode_06(); |
| 164 | static u_int decode_26(); |
| 165 | static u_int decode_2e(); |
| 166 | static void update_status_cbit(); |
| 167 | #endif /* _PROTOTYPES&&!_lint */ |
| 168 | |
| 169 | #define VASSERT(x) |
| 170 | |
| 171 | static void parisc_linux_get_fpu_type(u_int fpregs[]) |
| 172 | { |
| 173 | /* on pa-linux the fpu type is not filled in by the |
| 174 | * caller; it is constructed here |
| 175 | */ |
| 176 | if (boot_cpu_data.cpu_type == pcxs) |
| 177 | fpregs[FPU_TYPE_FLAG_POS] = TIMEX_EXTEN_FLAG; |
| 178 | else if (boot_cpu_data.cpu_type == pcxt || |
| 179 | boot_cpu_data.cpu_type == pcxt_) |
| 180 | fpregs[FPU_TYPE_FLAG_POS] = ROLEX_EXTEN_FLAG; |
| 181 | else if (boot_cpu_data.cpu_type >= pcxu) |
| 182 | fpregs[FPU_TYPE_FLAG_POS] = PA2_0_FPU_FLAG; |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * this routine will decode the excepting floating point instruction and |
Andrea Gelmini | 90afe0a | 2016-05-21 14:03:32 +0200 | [diff] [blame] | 187 | * call the appropriate emulation routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | * It is called by decode_fpu with the following parameters: |
| 189 | * fpudispatch(current_ir, unimplemented_code, 0, &Fpu_register) |
| 190 | * where current_ir is the instruction to be emulated, |
| 191 | * unimplemented_code is the exception_code that the hardware generated |
| 192 | * and &Fpu_register is the address of emulated FP reg 0. |
| 193 | */ |
| 194 | u_int |
| 195 | fpudispatch(u_int ir, u_int excp_code, u_int holder, u_int fpregs[]) |
| 196 | { |
| 197 | u_int class, subop; |
| 198 | u_int fpu_type_flags; |
| 199 | |
| 200 | /* All FP emulation code assumes that ints are 4-bytes in length */ |
| 201 | VASSERT(sizeof(int) == 4); |
| 202 | |
| 203 | parisc_linux_get_fpu_type(fpregs); |
| 204 | |
| 205 | fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */ |
| 206 | |
| 207 | class = get_class(ir); |
| 208 | if (class == 1) { |
| 209 | if (fpu_type_flags & PA2_0_FPU_FLAG) |
| 210 | subop = get_subop1_PA2_0(ir); |
| 211 | else |
| 212 | subop = get_subop1_PA1_1(ir); |
| 213 | } |
| 214 | else |
| 215 | subop = get_subop(ir); |
| 216 | |
| 217 | if (FPUDEBUG) printk("class %d subop %d\n", class, subop); |
| 218 | |
| 219 | switch (excp_code) { |
| 220 | case MAJOR_0C_EXCP: |
| 221 | case PA83_UNIMP_EXCP: |
| 222 | return(decode_0c(ir,class,subop,fpregs)); |
| 223 | case MAJOR_0E_EXCP: |
| 224 | return(decode_0e(ir,class,subop,fpregs)); |
| 225 | case MAJOR_06_EXCP: |
| 226 | return(decode_06(ir,fpregs)); |
| 227 | case MAJOR_26_EXCP: |
| 228 | return(decode_26(ir,fpregs)); |
| 229 | case MAJOR_2E_EXCP: |
| 230 | return(decode_2e(ir,fpregs)); |
| 231 | default: |
| 232 | /* "crashme Night Gallery painting nr 2. (asm_crash.s). |
| 233 | * This was fixed for multi-user kernels, but |
| 234 | * workstation kernels had a panic here. This allowed |
| 235 | * any arbitrary user to panic the kernel by executing |
| 236 | * setting the FP exception registers to strange values |
| 237 | * and generating an emulation trap. The emulation and |
| 238 | * exception code must never be able to panic the |
| 239 | * kernel. |
| 240 | */ |
| 241 | return(UNIMPLEMENTEDEXCEPTION); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * this routine is called by $emulation_trap to emulate a coprocessor |
| 247 | * instruction if one doesn't exist |
| 248 | */ |
| 249 | u_int |
| 250 | emfpudispatch(u_int ir, u_int dummy1, u_int dummy2, u_int fpregs[]) |
| 251 | { |
| 252 | u_int class, subop, major; |
| 253 | u_int fpu_type_flags; |
| 254 | |
| 255 | /* All FP emulation code assumes that ints are 4-bytes in length */ |
| 256 | VASSERT(sizeof(int) == 4); |
| 257 | |
| 258 | fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */ |
| 259 | |
| 260 | major = get_major(ir); |
| 261 | class = get_class(ir); |
| 262 | if (class == 1) { |
| 263 | if (fpu_type_flags & PA2_0_FPU_FLAG) |
| 264 | subop = get_subop1_PA2_0(ir); |
| 265 | else |
| 266 | subop = get_subop1_PA1_1(ir); |
| 267 | } |
| 268 | else |
| 269 | subop = get_subop(ir); |
| 270 | switch (major) { |
| 271 | case 0x0C: |
| 272 | return(decode_0c(ir,class,subop,fpregs)); |
| 273 | case 0x0E: |
| 274 | return(decode_0e(ir,class,subop,fpregs)); |
| 275 | case 0x06: |
| 276 | return(decode_06(ir,fpregs)); |
| 277 | case 0x26: |
| 278 | return(decode_26(ir,fpregs)); |
| 279 | case 0x2E: |
| 280 | return(decode_2e(ir,fpregs)); |
| 281 | default: |
| 282 | return(PA83_UNIMP_EXCP); |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | |
| 287 | static u_int |
| 288 | decode_0c(u_int ir, u_int class, u_int subop, u_int fpregs[]) |
| 289 | { |
| 290 | u_int r1,r2,t; /* operand register offsets */ |
| 291 | u_int fmt; /* also sf for class 1 conversions */ |
| 292 | u_int df; /* for class 1 conversions */ |
| 293 | u_int *status; |
| 294 | u_int retval, local_status; |
| 295 | u_int fpu_type_flags; |
| 296 | |
| 297 | if (ir == COPR_INST) { |
| 298 | fpregs[0] = EMULATION_VERSION << 11; |
| 299 | return(NOEXCEPTION); |
| 300 | } |
| 301 | status = &fpregs[0]; /* fp status register */ |
| 302 | local_status = fpregs[0]; /* and local copy */ |
| 303 | r1 = extru(ir,fpr1pos,5) * sizeof(double)/sizeof(u_int); |
| 304 | if (r1 == 0) /* map fr0 source to constant zero */ |
| 305 | r1 = fpzeroreg; |
| 306 | t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int); |
| 307 | if (t == 0 && class != 2) /* don't allow fr0 as a dest */ |
| 308 | return(MAJOR_0C_EXCP); |
| 309 | fmt = extru(ir,fpfmtpos,2); /* get fmt completer */ |
| 310 | |
| 311 | switch (class) { |
| 312 | case 0: |
| 313 | switch (subop) { |
| 314 | case 0: /* COPR 0,0 emulated above*/ |
| 315 | case 1: |
| 316 | return(MAJOR_0C_EXCP); |
| 317 | case 2: /* FCPY */ |
| 318 | switch (fmt) { |
| 319 | case 2: /* illegal */ |
| 320 | return(MAJOR_0C_EXCP); |
| 321 | case 3: /* quad */ |
| 322 | t &= ~3; /* force to even reg #s */ |
| 323 | r1 &= ~3; |
| 324 | fpregs[t+3] = fpregs[r1+3]; |
| 325 | fpregs[t+2] = fpregs[r1+2]; |
| 326 | case 1: /* double */ |
| 327 | fpregs[t+1] = fpregs[r1+1]; |
| 328 | case 0: /* single */ |
| 329 | fpregs[t] = fpregs[r1]; |
| 330 | return(NOEXCEPTION); |
| 331 | } |
| 332 | case 3: /* FABS */ |
| 333 | switch (fmt) { |
| 334 | case 2: /* illegal */ |
| 335 | return(MAJOR_0C_EXCP); |
| 336 | case 3: /* quad */ |
| 337 | t &= ~3; /* force to even reg #s */ |
| 338 | r1 &= ~3; |
| 339 | fpregs[t+3] = fpregs[r1+3]; |
| 340 | fpregs[t+2] = fpregs[r1+2]; |
| 341 | case 1: /* double */ |
| 342 | fpregs[t+1] = fpregs[r1+1]; |
| 343 | case 0: /* single */ |
| 344 | /* copy and clear sign bit */ |
| 345 | fpregs[t] = fpregs[r1] & 0x7fffffff; |
| 346 | return(NOEXCEPTION); |
| 347 | } |
| 348 | case 6: /* FNEG */ |
| 349 | switch (fmt) { |
| 350 | case 2: /* illegal */ |
| 351 | return(MAJOR_0C_EXCP); |
| 352 | case 3: /* quad */ |
| 353 | t &= ~3; /* force to even reg #s */ |
| 354 | r1 &= ~3; |
| 355 | fpregs[t+3] = fpregs[r1+3]; |
| 356 | fpregs[t+2] = fpregs[r1+2]; |
| 357 | case 1: /* double */ |
| 358 | fpregs[t+1] = fpregs[r1+1]; |
| 359 | case 0: /* single */ |
| 360 | /* copy and invert sign bit */ |
| 361 | fpregs[t] = fpregs[r1] ^ 0x80000000; |
| 362 | return(NOEXCEPTION); |
| 363 | } |
| 364 | case 7: /* FNEGABS */ |
| 365 | switch (fmt) { |
| 366 | case 2: /* illegal */ |
| 367 | return(MAJOR_0C_EXCP); |
| 368 | case 3: /* quad */ |
| 369 | t &= ~3; /* force to even reg #s */ |
| 370 | r1 &= ~3; |
| 371 | fpregs[t+3] = fpregs[r1+3]; |
| 372 | fpregs[t+2] = fpregs[r1+2]; |
| 373 | case 1: /* double */ |
| 374 | fpregs[t+1] = fpregs[r1+1]; |
| 375 | case 0: /* single */ |
| 376 | /* copy and set sign bit */ |
| 377 | fpregs[t] = fpregs[r1] | 0x80000000; |
| 378 | return(NOEXCEPTION); |
| 379 | } |
| 380 | case 4: /* FSQRT */ |
| 381 | switch (fmt) { |
| 382 | case 0: |
| 383 | return(sgl_fsqrt(&fpregs[r1],0, |
| 384 | &fpregs[t],status)); |
| 385 | case 1: |
| 386 | return(dbl_fsqrt(&fpregs[r1],0, |
| 387 | &fpregs[t],status)); |
| 388 | case 2: |
| 389 | case 3: /* quad not implemented */ |
| 390 | return(MAJOR_0C_EXCP); |
| 391 | } |
| 392 | case 5: /* FRND */ |
| 393 | switch (fmt) { |
| 394 | case 0: |
| 395 | return(sgl_frnd(&fpregs[r1],0, |
| 396 | &fpregs[t],status)); |
| 397 | case 1: |
| 398 | return(dbl_frnd(&fpregs[r1],0, |
| 399 | &fpregs[t],status)); |
| 400 | case 2: |
| 401 | case 3: /* quad not implemented */ |
| 402 | return(MAJOR_0C_EXCP); |
| 403 | } |
| 404 | } /* end of switch (subop) */ |
| 405 | |
| 406 | case 1: /* class 1 */ |
| 407 | df = extru(ir,fpdfpos,2); /* get dest format */ |
| 408 | if ((df & 2) || (fmt & 2)) { |
| 409 | /* |
| 410 | * fmt's 2 and 3 are illegal of not implemented |
| 411 | * quad conversions |
| 412 | */ |
| 413 | return(MAJOR_0C_EXCP); |
| 414 | } |
| 415 | /* |
| 416 | * encode source and dest formats into 2 bits. |
| 417 | * high bit is source, low bit is dest. |
| 418 | * bit = 1 --> double precision |
| 419 | */ |
| 420 | fmt = (fmt << 1) | df; |
| 421 | switch (subop) { |
| 422 | case 0: /* FCNVFF */ |
| 423 | switch(fmt) { |
| 424 | case 0: /* sgl/sgl */ |
| 425 | return(MAJOR_0C_EXCP); |
| 426 | case 1: /* sgl/dbl */ |
| 427 | return(sgl_to_dbl_fcnvff(&fpregs[r1],0, |
| 428 | &fpregs[t],status)); |
| 429 | case 2: /* dbl/sgl */ |
| 430 | return(dbl_to_sgl_fcnvff(&fpregs[r1],0, |
| 431 | &fpregs[t],status)); |
| 432 | case 3: /* dbl/dbl */ |
| 433 | return(MAJOR_0C_EXCP); |
| 434 | } |
| 435 | case 1: /* FCNVXF */ |
| 436 | switch(fmt) { |
| 437 | case 0: /* sgl/sgl */ |
| 438 | return(sgl_to_sgl_fcnvxf(&fpregs[r1],0, |
| 439 | &fpregs[t],status)); |
| 440 | case 1: /* sgl/dbl */ |
| 441 | return(sgl_to_dbl_fcnvxf(&fpregs[r1],0, |
| 442 | &fpregs[t],status)); |
| 443 | case 2: /* dbl/sgl */ |
| 444 | return(dbl_to_sgl_fcnvxf(&fpregs[r1],0, |
| 445 | &fpregs[t],status)); |
| 446 | case 3: /* dbl/dbl */ |
| 447 | return(dbl_to_dbl_fcnvxf(&fpregs[r1],0, |
| 448 | &fpregs[t],status)); |
| 449 | } |
| 450 | case 2: /* FCNVFX */ |
| 451 | switch(fmt) { |
| 452 | case 0: /* sgl/sgl */ |
| 453 | return(sgl_to_sgl_fcnvfx(&fpregs[r1],0, |
| 454 | &fpregs[t],status)); |
| 455 | case 1: /* sgl/dbl */ |
| 456 | return(sgl_to_dbl_fcnvfx(&fpregs[r1],0, |
| 457 | &fpregs[t],status)); |
| 458 | case 2: /* dbl/sgl */ |
| 459 | return(dbl_to_sgl_fcnvfx(&fpregs[r1],0, |
| 460 | &fpregs[t],status)); |
| 461 | case 3: /* dbl/dbl */ |
| 462 | return(dbl_to_dbl_fcnvfx(&fpregs[r1],0, |
| 463 | &fpregs[t],status)); |
| 464 | } |
| 465 | case 3: /* FCNVFXT */ |
| 466 | switch(fmt) { |
| 467 | case 0: /* sgl/sgl */ |
| 468 | return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0, |
| 469 | &fpregs[t],status)); |
| 470 | case 1: /* sgl/dbl */ |
| 471 | return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0, |
| 472 | &fpregs[t],status)); |
| 473 | case 2: /* dbl/sgl */ |
| 474 | return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0, |
| 475 | &fpregs[t],status)); |
| 476 | case 3: /* dbl/dbl */ |
| 477 | return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0, |
| 478 | &fpregs[t],status)); |
| 479 | } |
| 480 | case 5: /* FCNVUF (PA2.0 only) */ |
| 481 | switch(fmt) { |
| 482 | case 0: /* sgl/sgl */ |
| 483 | return(sgl_to_sgl_fcnvuf(&fpregs[r1],0, |
| 484 | &fpregs[t],status)); |
| 485 | case 1: /* sgl/dbl */ |
| 486 | return(sgl_to_dbl_fcnvuf(&fpregs[r1],0, |
| 487 | &fpregs[t],status)); |
| 488 | case 2: /* dbl/sgl */ |
| 489 | return(dbl_to_sgl_fcnvuf(&fpregs[r1],0, |
| 490 | &fpregs[t],status)); |
| 491 | case 3: /* dbl/dbl */ |
| 492 | return(dbl_to_dbl_fcnvuf(&fpregs[r1],0, |
| 493 | &fpregs[t],status)); |
| 494 | } |
| 495 | case 6: /* FCNVFU (PA2.0 only) */ |
| 496 | switch(fmt) { |
| 497 | case 0: /* sgl/sgl */ |
| 498 | return(sgl_to_sgl_fcnvfu(&fpregs[r1],0, |
| 499 | &fpregs[t],status)); |
| 500 | case 1: /* sgl/dbl */ |
| 501 | return(sgl_to_dbl_fcnvfu(&fpregs[r1],0, |
| 502 | &fpregs[t],status)); |
| 503 | case 2: /* dbl/sgl */ |
| 504 | return(dbl_to_sgl_fcnvfu(&fpregs[r1],0, |
| 505 | &fpregs[t],status)); |
| 506 | case 3: /* dbl/dbl */ |
| 507 | return(dbl_to_dbl_fcnvfu(&fpregs[r1],0, |
| 508 | &fpregs[t],status)); |
| 509 | } |
| 510 | case 7: /* FCNVFUT (PA2.0 only) */ |
| 511 | switch(fmt) { |
| 512 | case 0: /* sgl/sgl */ |
| 513 | return(sgl_to_sgl_fcnvfut(&fpregs[r1],0, |
| 514 | &fpregs[t],status)); |
| 515 | case 1: /* sgl/dbl */ |
| 516 | return(sgl_to_dbl_fcnvfut(&fpregs[r1],0, |
| 517 | &fpregs[t],status)); |
| 518 | case 2: /* dbl/sgl */ |
| 519 | return(dbl_to_sgl_fcnvfut(&fpregs[r1],0, |
| 520 | &fpregs[t],status)); |
| 521 | case 3: /* dbl/dbl */ |
| 522 | return(dbl_to_dbl_fcnvfut(&fpregs[r1],0, |
| 523 | &fpregs[t],status)); |
| 524 | } |
| 525 | case 4: /* undefined */ |
| 526 | return(MAJOR_0C_EXCP); |
| 527 | } /* end of switch subop */ |
| 528 | |
| 529 | case 2: /* class 2 */ |
| 530 | fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; |
| 531 | r2 = extru(ir, fpr2pos, 5) * sizeof(double)/sizeof(u_int); |
| 532 | if (r2 == 0) |
| 533 | r2 = fpzeroreg; |
| 534 | if (fpu_type_flags & PA2_0_FPU_FLAG) { |
| 535 | /* FTEST if nullify bit set, otherwise FCMP */ |
| 536 | if (extru(ir, fpnulpos, 1)) { /* FTEST */ |
| 537 | switch (fmt) { |
| 538 | case 0: |
| 539 | /* |
| 540 | * arg0 is not used |
| 541 | * second param is the t field used for |
| 542 | * ftest,acc and ftest,rej |
| 543 | * third param is the subop (y-field) |
| 544 | */ |
| 545 | BUG(); |
| 546 | /* Unsupported |
| 547 | * return(ftest(0L,extru(ir,fptpos,5), |
| 548 | * &fpregs[0],subop)); |
| 549 | */ |
| 550 | case 1: |
| 551 | case 2: |
| 552 | case 3: |
| 553 | return(MAJOR_0C_EXCP); |
| 554 | } |
| 555 | } else { /* FCMP */ |
| 556 | switch (fmt) { |
| 557 | case 0: |
| 558 | retval = sgl_fcmp(&fpregs[r1], |
| 559 | &fpregs[r2],extru(ir,fptpos,5), |
| 560 | &local_status); |
| 561 | update_status_cbit(status,local_status, |
| 562 | fpu_type_flags, subop); |
| 563 | return(retval); |
| 564 | case 1: |
| 565 | retval = dbl_fcmp(&fpregs[r1], |
| 566 | &fpregs[r2],extru(ir,fptpos,5), |
| 567 | &local_status); |
| 568 | update_status_cbit(status,local_status, |
| 569 | fpu_type_flags, subop); |
| 570 | return(retval); |
| 571 | case 2: /* illegal */ |
| 572 | case 3: /* quad not implemented */ |
| 573 | return(MAJOR_0C_EXCP); |
| 574 | } |
| 575 | } |
| 576 | } /* end of if for PA2.0 */ |
| 577 | else { /* PA1.0 & PA1.1 */ |
| 578 | switch (subop) { |
| 579 | case 2: |
| 580 | case 3: |
| 581 | case 4: |
| 582 | case 5: |
| 583 | case 6: |
| 584 | case 7: |
| 585 | return(MAJOR_0C_EXCP); |
| 586 | case 0: /* FCMP */ |
| 587 | switch (fmt) { |
| 588 | case 0: |
| 589 | retval = sgl_fcmp(&fpregs[r1], |
| 590 | &fpregs[r2],extru(ir,fptpos,5), |
| 591 | &local_status); |
| 592 | update_status_cbit(status,local_status, |
| 593 | fpu_type_flags, subop); |
| 594 | return(retval); |
| 595 | case 1: |
| 596 | retval = dbl_fcmp(&fpregs[r1], |
| 597 | &fpregs[r2],extru(ir,fptpos,5), |
| 598 | &local_status); |
| 599 | update_status_cbit(status,local_status, |
| 600 | fpu_type_flags, subop); |
| 601 | return(retval); |
| 602 | case 2: /* illegal */ |
| 603 | case 3: /* quad not implemented */ |
| 604 | return(MAJOR_0C_EXCP); |
| 605 | } |
| 606 | case 1: /* FTEST */ |
| 607 | switch (fmt) { |
| 608 | case 0: |
| 609 | /* |
| 610 | * arg0 is not used |
| 611 | * second param is the t field used for |
| 612 | * ftest,acc and ftest,rej |
| 613 | * third param is the subop (y-field) |
| 614 | */ |
| 615 | BUG(); |
| 616 | /* unsupported |
| 617 | * return(ftest(0L,extru(ir,fptpos,5), |
| 618 | * &fpregs[0],subop)); |
| 619 | */ |
| 620 | case 1: |
| 621 | case 2: |
| 622 | case 3: |
| 623 | return(MAJOR_0C_EXCP); |
| 624 | } |
| 625 | } /* end of switch subop */ |
| 626 | } /* end of else for PA1.0 & PA1.1 */ |
| 627 | case 3: /* class 3 */ |
| 628 | r2 = extru(ir,fpr2pos,5) * sizeof(double)/sizeof(u_int); |
| 629 | if (r2 == 0) |
| 630 | r2 = fpzeroreg; |
| 631 | switch (subop) { |
| 632 | case 5: |
| 633 | case 6: |
| 634 | case 7: |
| 635 | return(MAJOR_0C_EXCP); |
| 636 | |
| 637 | case 0: /* FADD */ |
| 638 | switch (fmt) { |
| 639 | case 0: |
| 640 | return(sgl_fadd(&fpregs[r1],&fpregs[r2], |
| 641 | &fpregs[t],status)); |
| 642 | case 1: |
| 643 | return(dbl_fadd(&fpregs[r1],&fpregs[r2], |
| 644 | &fpregs[t],status)); |
| 645 | case 2: /* illegal */ |
| 646 | case 3: /* quad not implemented */ |
| 647 | return(MAJOR_0C_EXCP); |
| 648 | } |
| 649 | case 1: /* FSUB */ |
| 650 | switch (fmt) { |
| 651 | case 0: |
| 652 | return(sgl_fsub(&fpregs[r1],&fpregs[r2], |
| 653 | &fpregs[t],status)); |
| 654 | case 1: |
| 655 | return(dbl_fsub(&fpregs[r1],&fpregs[r2], |
| 656 | &fpregs[t],status)); |
| 657 | case 2: /* illegal */ |
| 658 | case 3: /* quad not implemented */ |
| 659 | return(MAJOR_0C_EXCP); |
| 660 | } |
| 661 | case 2: /* FMPY */ |
| 662 | switch (fmt) { |
| 663 | case 0: |
| 664 | return(sgl_fmpy(&fpregs[r1],&fpregs[r2], |
| 665 | &fpregs[t],status)); |
| 666 | case 1: |
| 667 | return(dbl_fmpy(&fpregs[r1],&fpregs[r2], |
| 668 | &fpregs[t],status)); |
| 669 | case 2: /* illegal */ |
| 670 | case 3: /* quad not implemented */ |
| 671 | return(MAJOR_0C_EXCP); |
| 672 | } |
| 673 | case 3: /* FDIV */ |
| 674 | switch (fmt) { |
| 675 | case 0: |
| 676 | return(sgl_fdiv(&fpregs[r1],&fpregs[r2], |
| 677 | &fpregs[t],status)); |
| 678 | case 1: |
| 679 | return(dbl_fdiv(&fpregs[r1],&fpregs[r2], |
| 680 | &fpregs[t],status)); |
| 681 | case 2: /* illegal */ |
| 682 | case 3: /* quad not implemented */ |
| 683 | return(MAJOR_0C_EXCP); |
| 684 | } |
| 685 | case 4: /* FREM */ |
| 686 | switch (fmt) { |
| 687 | case 0: |
| 688 | return(sgl_frem(&fpregs[r1],&fpregs[r2], |
| 689 | &fpregs[t],status)); |
| 690 | case 1: |
| 691 | return(dbl_frem(&fpregs[r1],&fpregs[r2], |
| 692 | &fpregs[t],status)); |
| 693 | case 2: /* illegal */ |
| 694 | case 3: /* quad not implemented */ |
| 695 | return(MAJOR_0C_EXCP); |
| 696 | } |
| 697 | } /* end of class 3 switch */ |
| 698 | } /* end of switch(class) */ |
| 699 | |
| 700 | /* If we get here, something is really wrong! */ |
| 701 | return(MAJOR_0C_EXCP); |
| 702 | } |
| 703 | |
| 704 | static u_int |
| 705 | decode_0e(ir,class,subop,fpregs) |
| 706 | u_int ir,class,subop; |
| 707 | u_int fpregs[]; |
| 708 | { |
| 709 | u_int r1,r2,t; /* operand register offsets */ |
| 710 | u_int fmt; /* also sf for class 1 conversions */ |
| 711 | u_int df; /* dest format for class 1 conversions */ |
| 712 | u_int *status; |
| 713 | u_int retval, local_status; |
| 714 | u_int fpu_type_flags; |
| 715 | |
| 716 | status = &fpregs[0]; |
| 717 | local_status = fpregs[0]; |
| 718 | r1 = ((extru(ir,fpr1pos,5)<<1)|(extru(ir,fpxr1pos,1))); |
| 719 | if (r1 == 0) |
| 720 | r1 = fpzeroreg; |
| 721 | t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1))); |
| 722 | if (t == 0 && class != 2) |
| 723 | return(MAJOR_0E_EXCP); |
| 724 | if (class < 2) /* class 0 or 1 has 2 bit fmt */ |
| 725 | fmt = extru(ir,fpfmtpos,2); |
| 726 | else /* class 2 and 3 have 1 bit fmt */ |
| 727 | fmt = extru(ir,fp0efmtpos,1); |
| 728 | /* |
| 729 | * An undefined combination, double precision accessing the |
| 730 | * right half of a FPR, can get us into trouble. |
| 731 | * Let's just force proper alignment on it. |
| 732 | */ |
| 733 | if (fmt == DBL) { |
| 734 | r1 &= ~1; |
| 735 | if (class != 1) |
| 736 | t &= ~1; |
| 737 | } |
| 738 | |
| 739 | switch (class) { |
| 740 | case 0: |
| 741 | switch (subop) { |
| 742 | case 0: /* unimplemented */ |
| 743 | case 1: |
| 744 | return(MAJOR_0E_EXCP); |
| 745 | case 2: /* FCPY */ |
| 746 | switch (fmt) { |
| 747 | case 2: |
| 748 | case 3: |
| 749 | return(MAJOR_0E_EXCP); |
| 750 | case 1: /* double */ |
| 751 | fpregs[t+1] = fpregs[r1+1]; |
| 752 | case 0: /* single */ |
| 753 | fpregs[t] = fpregs[r1]; |
| 754 | return(NOEXCEPTION); |
| 755 | } |
| 756 | case 3: /* FABS */ |
| 757 | switch (fmt) { |
| 758 | case 2: |
| 759 | case 3: |
| 760 | return(MAJOR_0E_EXCP); |
| 761 | case 1: /* double */ |
| 762 | fpregs[t+1] = fpregs[r1+1]; |
| 763 | case 0: /* single */ |
| 764 | fpregs[t] = fpregs[r1] & 0x7fffffff; |
| 765 | return(NOEXCEPTION); |
| 766 | } |
| 767 | case 6: /* FNEG */ |
| 768 | switch (fmt) { |
| 769 | case 2: |
| 770 | case 3: |
| 771 | return(MAJOR_0E_EXCP); |
| 772 | case 1: /* double */ |
| 773 | fpregs[t+1] = fpregs[r1+1]; |
| 774 | case 0: /* single */ |
| 775 | fpregs[t] = fpregs[r1] ^ 0x80000000; |
| 776 | return(NOEXCEPTION); |
| 777 | } |
| 778 | case 7: /* FNEGABS */ |
| 779 | switch (fmt) { |
| 780 | case 2: |
| 781 | case 3: |
| 782 | return(MAJOR_0E_EXCP); |
| 783 | case 1: /* double */ |
| 784 | fpregs[t+1] = fpregs[r1+1]; |
| 785 | case 0: /* single */ |
| 786 | fpregs[t] = fpregs[r1] | 0x80000000; |
| 787 | return(NOEXCEPTION); |
| 788 | } |
| 789 | case 4: /* FSQRT */ |
| 790 | switch (fmt) { |
| 791 | case 0: |
| 792 | return(sgl_fsqrt(&fpregs[r1],0, |
| 793 | &fpregs[t], status)); |
| 794 | case 1: |
| 795 | return(dbl_fsqrt(&fpregs[r1],0, |
| 796 | &fpregs[t], status)); |
| 797 | case 2: |
| 798 | case 3: |
| 799 | return(MAJOR_0E_EXCP); |
| 800 | } |
| 801 | case 5: /* FRMD */ |
| 802 | switch (fmt) { |
| 803 | case 0: |
| 804 | return(sgl_frnd(&fpregs[r1],0, |
| 805 | &fpregs[t], status)); |
| 806 | case 1: |
| 807 | return(dbl_frnd(&fpregs[r1],0, |
| 808 | &fpregs[t], status)); |
| 809 | case 2: |
| 810 | case 3: |
| 811 | return(MAJOR_0E_EXCP); |
| 812 | } |
| 813 | } /* end of switch (subop */ |
| 814 | |
| 815 | case 1: /* class 1 */ |
| 816 | df = extru(ir,fpdfpos,2); /* get dest format */ |
| 817 | /* |
| 818 | * Fix Crashme problem (writing to 31R in double precision) |
| 819 | * here too. |
| 820 | */ |
| 821 | if (df == DBL) { |
| 822 | t &= ~1; |
| 823 | } |
| 824 | if ((df & 2) || (fmt & 2)) |
| 825 | return(MAJOR_0E_EXCP); |
| 826 | |
| 827 | fmt = (fmt << 1) | df; |
| 828 | switch (subop) { |
| 829 | case 0: /* FCNVFF */ |
| 830 | switch(fmt) { |
| 831 | case 0: /* sgl/sgl */ |
| 832 | return(MAJOR_0E_EXCP); |
| 833 | case 1: /* sgl/dbl */ |
| 834 | return(sgl_to_dbl_fcnvff(&fpregs[r1],0, |
| 835 | &fpregs[t],status)); |
| 836 | case 2: /* dbl/sgl */ |
| 837 | return(dbl_to_sgl_fcnvff(&fpregs[r1],0, |
| 838 | &fpregs[t],status)); |
| 839 | case 3: /* dbl/dbl */ |
| 840 | return(MAJOR_0E_EXCP); |
| 841 | } |
| 842 | case 1: /* FCNVXF */ |
| 843 | switch(fmt) { |
| 844 | case 0: /* sgl/sgl */ |
| 845 | return(sgl_to_sgl_fcnvxf(&fpregs[r1],0, |
| 846 | &fpregs[t],status)); |
| 847 | case 1: /* sgl/dbl */ |
| 848 | return(sgl_to_dbl_fcnvxf(&fpregs[r1],0, |
| 849 | &fpregs[t],status)); |
| 850 | case 2: /* dbl/sgl */ |
| 851 | return(dbl_to_sgl_fcnvxf(&fpregs[r1],0, |
| 852 | &fpregs[t],status)); |
| 853 | case 3: /* dbl/dbl */ |
| 854 | return(dbl_to_dbl_fcnvxf(&fpregs[r1],0, |
| 855 | &fpregs[t],status)); |
| 856 | } |
| 857 | case 2: /* FCNVFX */ |
| 858 | switch(fmt) { |
| 859 | case 0: /* sgl/sgl */ |
| 860 | return(sgl_to_sgl_fcnvfx(&fpregs[r1],0, |
| 861 | &fpregs[t],status)); |
| 862 | case 1: /* sgl/dbl */ |
| 863 | return(sgl_to_dbl_fcnvfx(&fpregs[r1],0, |
| 864 | &fpregs[t],status)); |
| 865 | case 2: /* dbl/sgl */ |
| 866 | return(dbl_to_sgl_fcnvfx(&fpregs[r1],0, |
| 867 | &fpregs[t],status)); |
| 868 | case 3: /* dbl/dbl */ |
| 869 | return(dbl_to_dbl_fcnvfx(&fpregs[r1],0, |
| 870 | &fpregs[t],status)); |
| 871 | } |
| 872 | case 3: /* FCNVFXT */ |
| 873 | switch(fmt) { |
| 874 | case 0: /* sgl/sgl */ |
| 875 | return(sgl_to_sgl_fcnvfxt(&fpregs[r1],0, |
| 876 | &fpregs[t],status)); |
| 877 | case 1: /* sgl/dbl */ |
| 878 | return(sgl_to_dbl_fcnvfxt(&fpregs[r1],0, |
| 879 | &fpregs[t],status)); |
| 880 | case 2: /* dbl/sgl */ |
| 881 | return(dbl_to_sgl_fcnvfxt(&fpregs[r1],0, |
| 882 | &fpregs[t],status)); |
| 883 | case 3: /* dbl/dbl */ |
| 884 | return(dbl_to_dbl_fcnvfxt(&fpregs[r1],0, |
| 885 | &fpregs[t],status)); |
| 886 | } |
| 887 | case 5: /* FCNVUF (PA2.0 only) */ |
| 888 | switch(fmt) { |
| 889 | case 0: /* sgl/sgl */ |
| 890 | return(sgl_to_sgl_fcnvuf(&fpregs[r1],0, |
| 891 | &fpregs[t],status)); |
| 892 | case 1: /* sgl/dbl */ |
| 893 | return(sgl_to_dbl_fcnvuf(&fpregs[r1],0, |
| 894 | &fpregs[t],status)); |
| 895 | case 2: /* dbl/sgl */ |
| 896 | return(dbl_to_sgl_fcnvuf(&fpregs[r1],0, |
| 897 | &fpregs[t],status)); |
| 898 | case 3: /* dbl/dbl */ |
| 899 | return(dbl_to_dbl_fcnvuf(&fpregs[r1],0, |
| 900 | &fpregs[t],status)); |
| 901 | } |
| 902 | case 6: /* FCNVFU (PA2.0 only) */ |
| 903 | switch(fmt) { |
| 904 | case 0: /* sgl/sgl */ |
| 905 | return(sgl_to_sgl_fcnvfu(&fpregs[r1],0, |
| 906 | &fpregs[t],status)); |
| 907 | case 1: /* sgl/dbl */ |
| 908 | return(sgl_to_dbl_fcnvfu(&fpregs[r1],0, |
| 909 | &fpregs[t],status)); |
| 910 | case 2: /* dbl/sgl */ |
| 911 | return(dbl_to_sgl_fcnvfu(&fpregs[r1],0, |
| 912 | &fpregs[t],status)); |
| 913 | case 3: /* dbl/dbl */ |
| 914 | return(dbl_to_dbl_fcnvfu(&fpregs[r1],0, |
| 915 | &fpregs[t],status)); |
| 916 | } |
| 917 | case 7: /* FCNVFUT (PA2.0 only) */ |
| 918 | switch(fmt) { |
| 919 | case 0: /* sgl/sgl */ |
| 920 | return(sgl_to_sgl_fcnvfut(&fpregs[r1],0, |
| 921 | &fpregs[t],status)); |
| 922 | case 1: /* sgl/dbl */ |
| 923 | return(sgl_to_dbl_fcnvfut(&fpregs[r1],0, |
| 924 | &fpregs[t],status)); |
| 925 | case 2: /* dbl/sgl */ |
| 926 | return(dbl_to_sgl_fcnvfut(&fpregs[r1],0, |
| 927 | &fpregs[t],status)); |
| 928 | case 3: /* dbl/dbl */ |
| 929 | return(dbl_to_dbl_fcnvfut(&fpregs[r1],0, |
| 930 | &fpregs[t],status)); |
| 931 | } |
| 932 | case 4: /* undefined */ |
| 933 | return(MAJOR_0C_EXCP); |
| 934 | } /* end of switch subop */ |
| 935 | case 2: /* class 2 */ |
| 936 | /* |
| 937 | * Be careful out there. |
| 938 | * Crashme can generate cases where FR31R is specified |
| 939 | * as the source or target of a double precision operation. |
| 940 | * Since we just pass the address of the floating-point |
| 941 | * register to the emulation routines, this can cause |
| 942 | * corruption of fpzeroreg. |
| 943 | */ |
| 944 | if (fmt == DBL) |
| 945 | r2 = (extru(ir,fpr2pos,5)<<1); |
| 946 | else |
| 947 | r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1))); |
| 948 | fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; |
| 949 | if (r2 == 0) |
| 950 | r2 = fpzeroreg; |
| 951 | if (fpu_type_flags & PA2_0_FPU_FLAG) { |
| 952 | /* FTEST if nullify bit set, otherwise FCMP */ |
| 953 | if (extru(ir, fpnulpos, 1)) { /* FTEST */ |
| 954 | /* not legal */ |
| 955 | return(MAJOR_0E_EXCP); |
| 956 | } else { /* FCMP */ |
| 957 | switch (fmt) { |
| 958 | /* |
| 959 | * fmt is only 1 bit long |
| 960 | */ |
| 961 | case 0: |
| 962 | retval = sgl_fcmp(&fpregs[r1], |
| 963 | &fpregs[r2],extru(ir,fptpos,5), |
| 964 | &local_status); |
| 965 | update_status_cbit(status,local_status, |
| 966 | fpu_type_flags, subop); |
| 967 | return(retval); |
| 968 | case 1: |
| 969 | retval = dbl_fcmp(&fpregs[r1], |
| 970 | &fpregs[r2],extru(ir,fptpos,5), |
| 971 | &local_status); |
| 972 | update_status_cbit(status,local_status, |
| 973 | fpu_type_flags, subop); |
| 974 | return(retval); |
| 975 | } |
| 976 | } |
| 977 | } /* end of if for PA2.0 */ |
| 978 | else { /* PA1.0 & PA1.1 */ |
| 979 | switch (subop) { |
| 980 | case 1: |
| 981 | case 2: |
| 982 | case 3: |
| 983 | case 4: |
| 984 | case 5: |
| 985 | case 6: |
| 986 | case 7: |
| 987 | return(MAJOR_0E_EXCP); |
| 988 | case 0: /* FCMP */ |
| 989 | switch (fmt) { |
| 990 | /* |
| 991 | * fmt is only 1 bit long |
| 992 | */ |
| 993 | case 0: |
| 994 | retval = sgl_fcmp(&fpregs[r1], |
| 995 | &fpregs[r2],extru(ir,fptpos,5), |
| 996 | &local_status); |
| 997 | update_status_cbit(status,local_status, |
| 998 | fpu_type_flags, subop); |
| 999 | return(retval); |
| 1000 | case 1: |
| 1001 | retval = dbl_fcmp(&fpregs[r1], |
| 1002 | &fpregs[r2],extru(ir,fptpos,5), |
| 1003 | &local_status); |
| 1004 | update_status_cbit(status,local_status, |
| 1005 | fpu_type_flags, subop); |
| 1006 | return(retval); |
| 1007 | } |
| 1008 | } /* end of switch subop */ |
| 1009 | } /* end of else for PA1.0 & PA1.1 */ |
| 1010 | case 3: /* class 3 */ |
| 1011 | /* |
| 1012 | * Be careful out there. |
| 1013 | * Crashme can generate cases where FR31R is specified |
| 1014 | * as the source or target of a double precision operation. |
| 1015 | * Since we just pass the address of the floating-point |
| 1016 | * register to the emulation routines, this can cause |
| 1017 | * corruption of fpzeroreg. |
| 1018 | */ |
| 1019 | if (fmt == DBL) |
| 1020 | r2 = (extru(ir,fpr2pos,5)<<1); |
| 1021 | else |
| 1022 | r2 = ((extru(ir,fpr2pos,5)<<1)|(extru(ir,fpxr2pos,1))); |
| 1023 | if (r2 == 0) |
| 1024 | r2 = fpzeroreg; |
| 1025 | switch (subop) { |
| 1026 | case 5: |
| 1027 | case 6: |
| 1028 | case 7: |
| 1029 | return(MAJOR_0E_EXCP); |
| 1030 | |
| 1031 | /* |
| 1032 | * Note that fmt is only 1 bit for class 3 */ |
| 1033 | case 0: /* FADD */ |
| 1034 | switch (fmt) { |
| 1035 | case 0: |
| 1036 | return(sgl_fadd(&fpregs[r1],&fpregs[r2], |
| 1037 | &fpregs[t],status)); |
| 1038 | case 1: |
| 1039 | return(dbl_fadd(&fpregs[r1],&fpregs[r2], |
| 1040 | &fpregs[t],status)); |
| 1041 | } |
| 1042 | case 1: /* FSUB */ |
| 1043 | switch (fmt) { |
| 1044 | case 0: |
| 1045 | return(sgl_fsub(&fpregs[r1],&fpregs[r2], |
| 1046 | &fpregs[t],status)); |
| 1047 | case 1: |
| 1048 | return(dbl_fsub(&fpregs[r1],&fpregs[r2], |
| 1049 | &fpregs[t],status)); |
| 1050 | } |
| 1051 | case 2: /* FMPY or XMPYU */ |
| 1052 | /* |
| 1053 | * check for integer multiply (x bit set) |
| 1054 | */ |
| 1055 | if (extru(ir,fpxpos,1)) { |
| 1056 | /* |
| 1057 | * emulate XMPYU |
| 1058 | */ |
| 1059 | switch (fmt) { |
| 1060 | case 0: |
| 1061 | /* |
| 1062 | * bad instruction if t specifies |
| 1063 | * the right half of a register |
| 1064 | */ |
| 1065 | if (t & 1) |
| 1066 | return(MAJOR_0E_EXCP); |
| 1067 | BUG(); |
| 1068 | /* unsupported |
| 1069 | * impyu(&fpregs[r1],&fpregs[r2], |
| 1070 | * &fpregs[t]); |
| 1071 | */ |
| 1072 | return(NOEXCEPTION); |
| 1073 | case 1: |
| 1074 | return(MAJOR_0E_EXCP); |
| 1075 | } |
| 1076 | } |
| 1077 | else { /* FMPY */ |
| 1078 | switch (fmt) { |
| 1079 | case 0: |
| 1080 | return(sgl_fmpy(&fpregs[r1], |
| 1081 | &fpregs[r2],&fpregs[t],status)); |
| 1082 | case 1: |
| 1083 | return(dbl_fmpy(&fpregs[r1], |
| 1084 | &fpregs[r2],&fpregs[t],status)); |
| 1085 | } |
| 1086 | } |
| 1087 | case 3: /* FDIV */ |
| 1088 | switch (fmt) { |
| 1089 | case 0: |
| 1090 | return(sgl_fdiv(&fpregs[r1],&fpregs[r2], |
| 1091 | &fpregs[t],status)); |
| 1092 | case 1: |
| 1093 | return(dbl_fdiv(&fpregs[r1],&fpregs[r2], |
| 1094 | &fpregs[t],status)); |
| 1095 | } |
| 1096 | case 4: /* FREM */ |
| 1097 | switch (fmt) { |
| 1098 | case 0: |
| 1099 | return(sgl_frem(&fpregs[r1],&fpregs[r2], |
| 1100 | &fpregs[t],status)); |
| 1101 | case 1: |
| 1102 | return(dbl_frem(&fpregs[r1],&fpregs[r2], |
| 1103 | &fpregs[t],status)); |
| 1104 | } |
| 1105 | } /* end of class 3 switch */ |
| 1106 | } /* end of switch(class) */ |
| 1107 | |
| 1108 | /* If we get here, something is really wrong! */ |
| 1109 | return(MAJOR_0E_EXCP); |
| 1110 | } |
| 1111 | |
| 1112 | |
| 1113 | /* |
| 1114 | * routine to decode the 06 (FMPYADD and FMPYCFXT) instruction |
| 1115 | */ |
| 1116 | static u_int |
| 1117 | decode_06(ir,fpregs) |
| 1118 | u_int ir; |
| 1119 | u_int fpregs[]; |
| 1120 | { |
| 1121 | u_int rm1, rm2, tm, ra, ta; /* operands */ |
| 1122 | u_int fmt; |
| 1123 | u_int error = 0; |
| 1124 | u_int status; |
| 1125 | u_int fpu_type_flags; |
| 1126 | union { |
| 1127 | double dbl; |
| 1128 | float flt; |
| 1129 | struct { u_int i1; u_int i2; } ints; |
| 1130 | } mtmp, atmp; |
| 1131 | |
| 1132 | |
| 1133 | status = fpregs[0]; /* use a local copy of status reg */ |
| 1134 | fpu_type_flags=fpregs[FPU_TYPE_FLAG_POS]; /* get fpu type flags */ |
| 1135 | fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */ |
| 1136 | if (fmt == 0) { /* DBL */ |
| 1137 | rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int); |
| 1138 | if (rm1 == 0) |
| 1139 | rm1 = fpzeroreg; |
| 1140 | rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int); |
| 1141 | if (rm2 == 0) |
| 1142 | rm2 = fpzeroreg; |
| 1143 | tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int); |
| 1144 | if (tm == 0) |
| 1145 | return(MAJOR_06_EXCP); |
| 1146 | ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int); |
| 1147 | ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int); |
| 1148 | if (ta == 0) |
| 1149 | return(MAJOR_06_EXCP); |
| 1150 | |
| 1151 | if (fpu_type_flags & TIMEX_ROLEX_FPU_MASK) { |
| 1152 | |
| 1153 | if (ra == 0) { |
| 1154 | /* special case FMPYCFXT, see sgl case below */ |
| 1155 | if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2], |
| 1156 | &mtmp.ints.i1,&status)) |
| 1157 | error = 1; |
| 1158 | if (dbl_to_sgl_fcnvfxt(&fpregs[ta], |
| 1159 | &atmp.ints.i1,&atmp.ints.i1,&status)) |
| 1160 | error = 1; |
| 1161 | } |
| 1162 | else { |
| 1163 | |
| 1164 | if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1, |
| 1165 | &status)) |
| 1166 | error = 1; |
| 1167 | if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1, |
| 1168 | &status)) |
| 1169 | error = 1; |
| 1170 | } |
| 1171 | } |
| 1172 | |
| 1173 | else |
| 1174 | |
| 1175 | { |
| 1176 | if (ra == 0) |
| 1177 | ra = fpzeroreg; |
| 1178 | |
| 1179 | if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1, |
| 1180 | &status)) |
| 1181 | error = 1; |
| 1182 | if (dbl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1, |
| 1183 | &status)) |
| 1184 | error = 1; |
| 1185 | |
| 1186 | } |
| 1187 | |
| 1188 | if (error) |
| 1189 | return(MAJOR_06_EXCP); |
| 1190 | else { |
| 1191 | /* copy results */ |
| 1192 | fpregs[tm] = mtmp.ints.i1; |
| 1193 | fpregs[tm+1] = mtmp.ints.i2; |
| 1194 | fpregs[ta] = atmp.ints.i1; |
| 1195 | fpregs[ta+1] = atmp.ints.i2; |
| 1196 | fpregs[0] = status; |
| 1197 | return(NOEXCEPTION); |
| 1198 | } |
| 1199 | } |
| 1200 | else { /* SGL */ |
| 1201 | /* |
| 1202 | * calculate offsets for single precision numbers |
| 1203 | * See table 6-14 in PA-89 architecture for mapping |
| 1204 | */ |
| 1205 | rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1; /* get offset */ |
| 1206 | rm1 |= extru(ir,fprm1pos-4,1); /* add right word offset */ |
| 1207 | |
| 1208 | rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1; /* get offset */ |
| 1209 | rm2 |= extru(ir,fprm2pos-4,1); /* add right word offset */ |
| 1210 | |
| 1211 | tm = (extru(ir,fptmpos,4) | 0x10 ) << 1; /* get offset */ |
| 1212 | tm |= extru(ir,fptmpos-4,1); /* add right word offset */ |
| 1213 | |
| 1214 | ra = (extru(ir,fprapos,4) | 0x10 ) << 1; /* get offset */ |
| 1215 | ra |= extru(ir,fprapos-4,1); /* add right word offset */ |
| 1216 | |
| 1217 | ta = (extru(ir,fptapos,4) | 0x10 ) << 1; /* get offset */ |
| 1218 | ta |= extru(ir,fptapos-4,1); /* add right word offset */ |
| 1219 | |
| 1220 | if (ra == 0x20 &&(fpu_type_flags & TIMEX_ROLEX_FPU_MASK)) { |
| 1221 | /* special case FMPYCFXT (really 0) |
| 1222 | * This instruction is only present on the Timex and |
| 1223 | * Rolex fpu's in so if it is the special case and |
| 1224 | * one of these fpu's we run the FMPYCFXT instruction |
| 1225 | */ |
| 1226 | if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1, |
| 1227 | &status)) |
| 1228 | error = 1; |
| 1229 | if (sgl_to_sgl_fcnvfxt(&fpregs[ta],&atmp.ints.i1, |
| 1230 | &atmp.ints.i1,&status)) |
| 1231 | error = 1; |
| 1232 | } |
| 1233 | else { |
| 1234 | if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1, |
| 1235 | &status)) |
| 1236 | error = 1; |
| 1237 | if (sgl_fadd(&fpregs[ta], &fpregs[ra], &atmp.ints.i1, |
| 1238 | &status)) |
| 1239 | error = 1; |
| 1240 | } |
| 1241 | if (error) |
| 1242 | return(MAJOR_06_EXCP); |
| 1243 | else { |
| 1244 | /* copy results */ |
| 1245 | fpregs[tm] = mtmp.ints.i1; |
| 1246 | fpregs[ta] = atmp.ints.i1; |
| 1247 | fpregs[0] = status; |
| 1248 | return(NOEXCEPTION); |
| 1249 | } |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | /* |
| 1254 | * routine to decode the 26 (FMPYSUB) instruction |
| 1255 | */ |
| 1256 | static u_int |
| 1257 | decode_26(ir,fpregs) |
| 1258 | u_int ir; |
| 1259 | u_int fpregs[]; |
| 1260 | { |
| 1261 | u_int rm1, rm2, tm, ra, ta; /* operands */ |
| 1262 | u_int fmt; |
| 1263 | u_int error = 0; |
| 1264 | u_int status; |
| 1265 | union { |
| 1266 | double dbl; |
| 1267 | float flt; |
| 1268 | struct { u_int i1; u_int i2; } ints; |
| 1269 | } mtmp, atmp; |
| 1270 | |
| 1271 | |
| 1272 | status = fpregs[0]; |
| 1273 | fmt = extru(ir, fpmultifmt, 1); /* get sgl/dbl flag */ |
| 1274 | if (fmt == 0) { /* DBL */ |
| 1275 | rm1 = extru(ir, fprm1pos, 5) * sizeof(double)/sizeof(u_int); |
| 1276 | if (rm1 == 0) |
| 1277 | rm1 = fpzeroreg; |
| 1278 | rm2 = extru(ir, fprm2pos, 5) * sizeof(double)/sizeof(u_int); |
| 1279 | if (rm2 == 0) |
| 1280 | rm2 = fpzeroreg; |
| 1281 | tm = extru(ir, fptmpos, 5) * sizeof(double)/sizeof(u_int); |
| 1282 | if (tm == 0) |
| 1283 | return(MAJOR_26_EXCP); |
| 1284 | ra = extru(ir, fprapos, 5) * sizeof(double)/sizeof(u_int); |
| 1285 | if (ra == 0) |
| 1286 | return(MAJOR_26_EXCP); |
| 1287 | ta = extru(ir, fptapos, 5) * sizeof(double)/sizeof(u_int); |
| 1288 | if (ta == 0) |
| 1289 | return(MAJOR_26_EXCP); |
| 1290 | |
| 1291 | if (dbl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status)) |
| 1292 | error = 1; |
| 1293 | if (dbl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status)) |
| 1294 | error = 1; |
| 1295 | if (error) |
| 1296 | return(MAJOR_26_EXCP); |
| 1297 | else { |
| 1298 | /* copy results */ |
| 1299 | fpregs[tm] = mtmp.ints.i1; |
| 1300 | fpregs[tm+1] = mtmp.ints.i2; |
| 1301 | fpregs[ta] = atmp.ints.i1; |
| 1302 | fpregs[ta+1] = atmp.ints.i2; |
| 1303 | fpregs[0] = status; |
| 1304 | return(NOEXCEPTION); |
| 1305 | } |
| 1306 | } |
| 1307 | else { /* SGL */ |
| 1308 | /* |
| 1309 | * calculate offsets for single precision numbers |
| 1310 | * See table 6-14 in PA-89 architecture for mapping |
| 1311 | */ |
| 1312 | rm1 = (extru(ir,fprm1pos,4) | 0x10 ) << 1; /* get offset */ |
| 1313 | rm1 |= extru(ir,fprm1pos-4,1); /* add right word offset */ |
| 1314 | |
| 1315 | rm2 = (extru(ir,fprm2pos,4) | 0x10 ) << 1; /* get offset */ |
| 1316 | rm2 |= extru(ir,fprm2pos-4,1); /* add right word offset */ |
| 1317 | |
| 1318 | tm = (extru(ir,fptmpos,4) | 0x10 ) << 1; /* get offset */ |
| 1319 | tm |= extru(ir,fptmpos-4,1); /* add right word offset */ |
| 1320 | |
| 1321 | ra = (extru(ir,fprapos,4) | 0x10 ) << 1; /* get offset */ |
| 1322 | ra |= extru(ir,fprapos-4,1); /* add right word offset */ |
| 1323 | |
| 1324 | ta = (extru(ir,fptapos,4) | 0x10 ) << 1; /* get offset */ |
| 1325 | ta |= extru(ir,fptapos-4,1); /* add right word offset */ |
| 1326 | |
| 1327 | if (sgl_fmpy(&fpregs[rm1],&fpregs[rm2],&mtmp.ints.i1,&status)) |
| 1328 | error = 1; |
| 1329 | if (sgl_fsub(&fpregs[ta], &fpregs[ra], &atmp.ints.i1,&status)) |
| 1330 | error = 1; |
| 1331 | if (error) |
| 1332 | return(MAJOR_26_EXCP); |
| 1333 | else { |
| 1334 | /* copy results */ |
| 1335 | fpregs[tm] = mtmp.ints.i1; |
| 1336 | fpregs[ta] = atmp.ints.i1; |
| 1337 | fpregs[0] = status; |
| 1338 | return(NOEXCEPTION); |
| 1339 | } |
| 1340 | } |
| 1341 | |
| 1342 | } |
| 1343 | |
| 1344 | /* |
| 1345 | * routine to decode the 2E (FMPYFADD,FMPYNFADD) instructions |
| 1346 | */ |
| 1347 | static u_int |
| 1348 | decode_2e(ir,fpregs) |
| 1349 | u_int ir; |
| 1350 | u_int fpregs[]; |
| 1351 | { |
| 1352 | u_int rm1, rm2, ra, t; /* operands */ |
| 1353 | u_int fmt; |
| 1354 | |
| 1355 | fmt = extru(ir,fpfmtpos,1); /* get fmt completer */ |
| 1356 | if (fmt == DBL) { /* DBL */ |
| 1357 | rm1 = extru(ir,fprm1pos,5) * sizeof(double)/sizeof(u_int); |
| 1358 | if (rm1 == 0) |
| 1359 | rm1 = fpzeroreg; |
| 1360 | rm2 = extru(ir,fprm2pos,5) * sizeof(double)/sizeof(u_int); |
| 1361 | if (rm2 == 0) |
| 1362 | rm2 = fpzeroreg; |
| 1363 | ra = ((extru(ir,fpraupos,3)<<2)|(extru(ir,fpralpos,3)>>1)) * |
| 1364 | sizeof(double)/sizeof(u_int); |
| 1365 | if (ra == 0) |
| 1366 | ra = fpzeroreg; |
| 1367 | t = extru(ir,fptpos,5) * sizeof(double)/sizeof(u_int); |
| 1368 | if (t == 0) |
| 1369 | return(MAJOR_2E_EXCP); |
| 1370 | |
| 1371 | if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */ |
| 1372 | return(dbl_fmpynfadd(&fpregs[rm1], &fpregs[rm2], |
| 1373 | &fpregs[ra], &fpregs[0], &fpregs[t])); |
| 1374 | } else { |
| 1375 | return(dbl_fmpyfadd(&fpregs[rm1], &fpregs[rm2], |
| 1376 | &fpregs[ra], &fpregs[0], &fpregs[t])); |
| 1377 | } |
| 1378 | } /* end DBL */ |
| 1379 | else { /* SGL */ |
| 1380 | rm1 = (extru(ir,fprm1pos,5)<<1)|(extru(ir,fpxrm1pos,1)); |
| 1381 | if (rm1 == 0) |
| 1382 | rm1 = fpzeroreg; |
| 1383 | rm2 = (extru(ir,fprm2pos,5)<<1)|(extru(ir,fpxrm2pos,1)); |
| 1384 | if (rm2 == 0) |
| 1385 | rm2 = fpzeroreg; |
| 1386 | ra = (extru(ir,fpraupos,3)<<3)|extru(ir,fpralpos,3); |
| 1387 | if (ra == 0) |
| 1388 | ra = fpzeroreg; |
| 1389 | t = ((extru(ir,fptpos,5)<<1)|(extru(ir,fpxtpos,1))); |
| 1390 | if (t == 0) |
| 1391 | return(MAJOR_2E_EXCP); |
| 1392 | |
| 1393 | if (extru(ir,fpfusedsubop,1)) { /* fmpyfadd or fmpynfadd? */ |
| 1394 | return(sgl_fmpynfadd(&fpregs[rm1], &fpregs[rm2], |
| 1395 | &fpregs[ra], &fpregs[0], &fpregs[t])); |
| 1396 | } else { |
| 1397 | return(sgl_fmpyfadd(&fpregs[rm1], &fpregs[rm2], |
| 1398 | &fpregs[ra], &fpregs[0], &fpregs[t])); |
| 1399 | } |
| 1400 | } /* end SGL */ |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * update_status_cbit |
| 1405 | * |
| 1406 | * This routine returns the correct FP status register value in |
| 1407 | * *status, based on the C-bit & V-bit returned by the FCMP |
| 1408 | * emulation routine in new_status. The architecture type |
| 1409 | * (PA83, PA89 or PA2.0) is available in fpu_type. The y_field |
| 1410 | * and the architecture type are used to determine what flavor |
| 1411 | * of FCMP is being emulated. |
| 1412 | */ |
| 1413 | static void |
| 1414 | update_status_cbit(status, new_status, fpu_type, y_field) |
| 1415 | u_int *status, new_status; |
| 1416 | u_int fpu_type; |
| 1417 | u_int y_field; |
| 1418 | { |
| 1419 | /* |
| 1420 | * For PA89 FPU's which implement the Compare Queue and |
| 1421 | * for PA2.0 FPU's, update the Compare Queue if the y-field = 0, |
| 1422 | * otherwise update the specified bit in the Compare Array. |
| 1423 | * Note that the y-field will always be 0 for non-PA2.0 FPU's. |
| 1424 | */ |
| 1425 | if ((fpu_type & TIMEX_EXTEN_FLAG) || |
| 1426 | (fpu_type & ROLEX_EXTEN_FLAG) || |
| 1427 | (fpu_type & PA2_0_FPU_FLAG)) { |
| 1428 | if (y_field == 0) { |
| 1429 | *status = ((*status & 0x04000000) >> 5) | /* old Cbit */ |
| 1430 | ((*status & 0x003ff000) >> 1) | /* old CQ */ |
| 1431 | (new_status & 0xffc007ff); /* all other bits*/ |
| 1432 | } else { |
| 1433 | *status = (*status & 0x04000000) | /* old Cbit */ |
| 1434 | ((new_status & 0x04000000) >> (y_field+4)) | |
| 1435 | (new_status & ~0x04000000 & /* other bits */ |
| 1436 | ~(0x04000000 >> (y_field+4))); |
| 1437 | } |
| 1438 | } |
| 1439 | /* if PA83, just update the C-bit */ |
| 1440 | else { |
| 1441 | *status = new_status; |
| 1442 | } |
| 1443 | } |