| 1 | /* Copyright (C) 1998, Cygnus Solutions |
| 2 | |
| 3 | This program is free software; you can redistribute it and/or modify |
| 4 | it under the terms of the GNU General Public License as published by |
| 5 | the Free Software Foundation; either version 3 of the License, or |
| 6 | (at your option) any later version. |
| 7 | |
| 8 | This program is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | GNU General Public License for more details. |
| 12 | |
| 13 | You should have received a copy of the GNU General Public License |
| 14 | along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 15 | |
| 16 | */ |
| 17 | |
| 18 | |
| 19 | #ifndef SIM_MAIN_C |
| 20 | #define SIM_MAIN_C |
| 21 | |
| 22 | #include "sim-main.h" |
| 23 | #include "sim-assert.h" |
| 24 | |
| 25 | |
| 26 | /*---------------------------------------------------------------------------*/ |
| 27 | /*-- simulator engine -------------------------------------------------------*/ |
| 28 | /*---------------------------------------------------------------------------*/ |
| 29 | |
| 30 | |
| 31 | /* Description from page A-22 of the "MIPS IV Instruction Set" manual |
| 32 | (revision 3.1) */ |
| 33 | /* Load a value from memory. Use the cache and main memory as |
| 34 | specified in the Cache Coherence Algorithm (CCA) and the sort of |
| 35 | access (IorD) to find the contents of AccessLength memory bytes |
| 36 | starting at physical location pAddr. The data is returned in the |
| 37 | fixed width naturally-aligned memory element (MemElem). The |
| 38 | low-order two (or three) bits of the address and the AccessLength |
| 39 | indicate which of the bytes within MemElem needs to be given to the |
| 40 | processor. If the memory access type of the reference is uncached |
| 41 | then only the referenced bytes are read from memory and valid |
| 42 | within the memory element. If the access type is cached, and the |
| 43 | data is not present in cache, an implementation specific size and |
| 44 | alignment block of memory is read and loaded into the cache to |
| 45 | satisfy a load reference. At a minimum, the block is the entire |
| 46 | memory element. */ |
| 47 | INLINE_SIM_MAIN (void) |
| 48 | load_memory (SIM_DESC SD, |
| 49 | sim_cpu *CPU, |
| 50 | address_word cia, |
| 51 | uword64* memvalp, |
| 52 | uword64* memval1p, |
| 53 | int CCA, |
| 54 | unsigned int AccessLength, |
| 55 | address_word pAddr, |
| 56 | address_word vAddr, |
| 57 | int IorD) |
| 58 | { |
| 59 | uword64 value = 0; |
| 60 | uword64 value1 = 0; |
| 61 | |
| 62 | #ifdef DEBUG |
| 63 | sim_io_printf(sd,"DBG: LoadMemory(%p,%p,%d,%d,0x%s,0x%s,%s)\n",memvalp,memval1p,CCA,AccessLength,pr_addr(pAddr),pr_addr(vAddr),(IorD ? "isDATA" : "isINSTRUCTION")); |
| 64 | #endif /* DEBUG */ |
| 65 | |
| 66 | #if defined(WARN_MEM) |
| 67 | if (CCA != uncached) |
| 68 | sim_io_eprintf(sd,"LoadMemory CCA (%d) is not uncached (currently all accesses treated as cached)\n",CCA); |
| 69 | #endif /* WARN_MEM */ |
| 70 | |
| 71 | if (((pAddr & LOADDRMASK) + AccessLength) > LOADDRMASK) |
| 72 | { |
| 73 | /* In reality this should be a Bus Error */ |
| 74 | sim_io_error (SD, "LOAD AccessLength of %d would extend over %d bit aligned boundary for physical address 0x%s\n", |
| 75 | AccessLength, |
| 76 | (LOADDRMASK + 1) << 3, |
| 77 | pr_addr (pAddr)); |
| 78 | } |
| 79 | |
| 80 | dotrace (SD, CPU, tracefh,((IorD == isDATA) ? 0 : 2),(unsigned int)(pAddr&0xFFFFFFFF),(AccessLength + 1),"load%s",((IorD == isDATA) ? "" : " instruction")); |
| 81 | |
| 82 | /* Read the specified number of bytes from memory. Adjust for |
| 83 | host/target byte ordering/ Align the least significant byte |
| 84 | read. */ |
| 85 | |
| 86 | switch (AccessLength) |
| 87 | { |
| 88 | case AccessLength_QUADWORD: |
| 89 | { |
| 90 | unsigned_16 val = sim_core_read_aligned_16 (CPU, cia, read_map, pAddr); |
| 91 | value1 = VH8_16 (val); |
| 92 | value = VL8_16 (val); |
| 93 | break; |
| 94 | } |
| 95 | case AccessLength_DOUBLEWORD: |
| 96 | value = sim_core_read_aligned_8 (CPU, cia, read_map, pAddr); |
| 97 | break; |
| 98 | case AccessLength_SEPTIBYTE: |
| 99 | value = sim_core_read_misaligned_7 (CPU, cia, read_map, pAddr); |
| 100 | break; |
| 101 | case AccessLength_SEXTIBYTE: |
| 102 | value = sim_core_read_misaligned_6 (CPU, cia, read_map, pAddr); |
| 103 | break; |
| 104 | case AccessLength_QUINTIBYTE: |
| 105 | value = sim_core_read_misaligned_5 (CPU, cia, read_map, pAddr); |
| 106 | break; |
| 107 | case AccessLength_WORD: |
| 108 | value = sim_core_read_aligned_4 (CPU, cia, read_map, pAddr); |
| 109 | break; |
| 110 | case AccessLength_TRIPLEBYTE: |
| 111 | value = sim_core_read_misaligned_3 (CPU, cia, read_map, pAddr); |
| 112 | break; |
| 113 | case AccessLength_HALFWORD: |
| 114 | value = sim_core_read_aligned_2 (CPU, cia, read_map, pAddr); |
| 115 | break; |
| 116 | case AccessLength_BYTE: |
| 117 | value = sim_core_read_aligned_1 (CPU, cia, read_map, pAddr); |
| 118 | break; |
| 119 | default: |
| 120 | abort (); |
| 121 | } |
| 122 | |
| 123 | #ifdef DEBUG |
| 124 | printf("DBG: LoadMemory() : (offset %d) : value = 0x%s%s\n", |
| 125 | (int)(pAddr & LOADDRMASK),pr_uword64(value1),pr_uword64(value)); |
| 126 | #endif /* DEBUG */ |
| 127 | |
| 128 | /* See also store_memory. Position data in correct byte lanes. */ |
| 129 | if (AccessLength <= LOADDRMASK) |
| 130 | { |
| 131 | if (BigEndianMem) |
| 132 | /* for big endian target, byte (pAddr&LOADDRMASK == 0) is |
| 133 | shifted to the most significant byte position. */ |
| 134 | value <<= (((LOADDRMASK - (pAddr & LOADDRMASK)) - AccessLength) * 8); |
| 135 | else |
| 136 | /* For little endian target, byte (pAddr&LOADDRMASK == 0) |
| 137 | is already in the correct postition. */ |
| 138 | value <<= ((pAddr & LOADDRMASK) * 8); |
| 139 | } |
| 140 | |
| 141 | #ifdef DEBUG |
| 142 | printf("DBG: LoadMemory() : shifted value = 0x%s%s\n", |
| 143 | pr_uword64(value1),pr_uword64(value)); |
| 144 | #endif /* DEBUG */ |
| 145 | |
| 146 | *memvalp = value; |
| 147 | if (memval1p) *memval1p = value1; |
| 148 | } |
| 149 | |
| 150 | |
| 151 | /* Description from page A-23 of the "MIPS IV Instruction Set" manual |
| 152 | (revision 3.1) */ |
| 153 | /* Store a value to memory. The specified data is stored into the |
| 154 | physical location pAddr using the memory hierarchy (data caches and |
| 155 | main memory) as specified by the Cache Coherence Algorithm |
| 156 | (CCA). The MemElem contains the data for an aligned, fixed-width |
| 157 | memory element (word for 32-bit processors, doubleword for 64-bit |
| 158 | processors), though only the bytes that will actually be stored to |
| 159 | memory need to be valid. The low-order two (or three) bits of pAddr |
| 160 | and the AccessLength field indicates which of the bytes within the |
| 161 | MemElem data should actually be stored; only these bytes in memory |
| 162 | will be changed. */ |
| 163 | |
| 164 | INLINE_SIM_MAIN (void) |
| 165 | store_memory (SIM_DESC SD, |
| 166 | sim_cpu *CPU, |
| 167 | address_word cia, |
| 168 | int CCA, |
| 169 | unsigned int AccessLength, |
| 170 | uword64 MemElem, |
| 171 | uword64 MemElem1, /* High order 64 bits */ |
| 172 | address_word pAddr, |
| 173 | address_word vAddr) |
| 174 | { |
| 175 | #ifdef DEBUG |
| 176 | sim_io_printf(sd,"DBG: StoreMemory(%d,%d,0x%s,0x%s,0x%s,0x%s)\n",CCA,AccessLength,pr_uword64(MemElem),pr_uword64(MemElem1),pr_addr(pAddr),pr_addr(vAddr)); |
| 177 | #endif /* DEBUG */ |
| 178 | |
| 179 | #if defined(WARN_MEM) |
| 180 | if (CCA != uncached) |
| 181 | sim_io_eprintf(sd,"StoreMemory CCA (%d) is not uncached (currently all accesses treated as cached)\n",CCA); |
| 182 | #endif /* WARN_MEM */ |
| 183 | |
| 184 | if (((pAddr & LOADDRMASK) + AccessLength) > LOADDRMASK) |
| 185 | sim_io_error (SD, "STORE AccessLength of %d would extend over %d bit aligned boundary for physical address 0x%s\n", |
| 186 | AccessLength, |
| 187 | (LOADDRMASK + 1) << 3, |
| 188 | pr_addr(pAddr)); |
| 189 | |
| 190 | dotrace (SD, CPU, tracefh,1,(unsigned int)(pAddr&0xFFFFFFFF),(AccessLength + 1),"store"); |
| 191 | |
| 192 | #ifdef DEBUG |
| 193 | printf("DBG: StoreMemory: offset = %d MemElem = 0x%s%s\n",(unsigned int)(pAddr & LOADDRMASK),pr_uword64(MemElem1),pr_uword64(MemElem)); |
| 194 | #endif /* DEBUG */ |
| 195 | |
| 196 | /* See also load_memory. Position data in correct byte lanes. */ |
| 197 | if (AccessLength <= LOADDRMASK) |
| 198 | { |
| 199 | if (BigEndianMem) |
| 200 | /* for big endian target, byte (pAddr&LOADDRMASK == 0) is |
| 201 | shifted to the most significant byte position. */ |
| 202 | MemElem >>= (((LOADDRMASK - (pAddr & LOADDRMASK)) - AccessLength) * 8); |
| 203 | else |
| 204 | /* For little endian target, byte (pAddr&LOADDRMASK == 0) |
| 205 | is already in the correct postition. */ |
| 206 | MemElem >>= ((pAddr & LOADDRMASK) * 8); |
| 207 | } |
| 208 | |
| 209 | #ifdef DEBUG |
| 210 | printf("DBG: StoreMemory: shift = %d MemElem = 0x%s%s\n",shift,pr_uword64(MemElem1),pr_uword64(MemElem)); |
| 211 | #endif /* DEBUG */ |
| 212 | |
| 213 | switch (AccessLength) |
| 214 | { |
| 215 | case AccessLength_QUADWORD: |
| 216 | { |
| 217 | unsigned_16 val = U16_8 (MemElem1, MemElem); |
| 218 | sim_core_write_aligned_16 (CPU, cia, write_map, pAddr, val); |
| 219 | break; |
| 220 | } |
| 221 | case AccessLength_DOUBLEWORD: |
| 222 | sim_core_write_aligned_8 (CPU, cia, write_map, pAddr, MemElem); |
| 223 | break; |
| 224 | case AccessLength_SEPTIBYTE: |
| 225 | sim_core_write_misaligned_7 (CPU, cia, write_map, pAddr, MemElem); |
| 226 | break; |
| 227 | case AccessLength_SEXTIBYTE: |
| 228 | sim_core_write_misaligned_6 (CPU, cia, write_map, pAddr, MemElem); |
| 229 | break; |
| 230 | case AccessLength_QUINTIBYTE: |
| 231 | sim_core_write_misaligned_5 (CPU, cia, write_map, pAddr, MemElem); |
| 232 | break; |
| 233 | case AccessLength_WORD: |
| 234 | sim_core_write_aligned_4 (CPU, cia, write_map, pAddr, MemElem); |
| 235 | break; |
| 236 | case AccessLength_TRIPLEBYTE: |
| 237 | sim_core_write_misaligned_3 (CPU, cia, write_map, pAddr, MemElem); |
| 238 | break; |
| 239 | case AccessLength_HALFWORD: |
| 240 | sim_core_write_aligned_2 (CPU, cia, write_map, pAddr, MemElem); |
| 241 | break; |
| 242 | case AccessLength_BYTE: |
| 243 | sim_core_write_aligned_1 (CPU, cia, write_map, pAddr, MemElem); |
| 244 | break; |
| 245 | default: |
| 246 | abort (); |
| 247 | } |
| 248 | |
| 249 | return; |
| 250 | } |
| 251 | |
| 252 | |
| 253 | INLINE_SIM_MAIN (unsigned32) |
| 254 | ifetch32 (SIM_DESC SD, |
| 255 | sim_cpu *CPU, |
| 256 | address_word cia, |
| 257 | address_word vaddr) |
| 258 | { |
| 259 | /* Copy the action of the LW instruction */ |
| 260 | address_word mask = LOADDRMASK; |
| 261 | address_word access = AccessLength_WORD; |
| 262 | address_word reverseendian = (ReverseEndian ? (mask ^ access) : 0); |
| 263 | address_word bigendiancpu = (BigEndianCPU ? (mask ^ access) : 0); |
| 264 | unsigned int byte; |
| 265 | address_word paddr = vaddr; |
| 266 | unsigned64 memval; |
| 267 | |
| 268 | if ((vaddr & access) != 0) |
| 269 | SignalExceptionInstructionFetch (); |
| 270 | paddr = ((paddr & ~mask) | ((paddr & mask) ^ reverseendian)); |
| 271 | LoadMemory (&memval, NULL, access, paddr, vaddr, isINSTRUCTION, isREAL); |
| 272 | byte = ((vaddr & mask) ^ bigendiancpu); |
| 273 | return (memval >> (8 * byte)); |
| 274 | } |
| 275 | |
| 276 | |
| 277 | INLINE_SIM_MAIN (unsigned16) |
| 278 | ifetch16 (SIM_DESC SD, |
| 279 | sim_cpu *CPU, |
| 280 | address_word cia, |
| 281 | address_word vaddr) |
| 282 | { |
| 283 | /* Copy the action of the LH instruction */ |
| 284 | address_word mask = LOADDRMASK; |
| 285 | address_word access = AccessLength_HALFWORD; |
| 286 | address_word reverseendian = (ReverseEndian ? (mask ^ access) : 0); |
| 287 | address_word bigendiancpu = (BigEndianCPU ? (mask ^ access) : 0); |
| 288 | unsigned int byte; |
| 289 | address_word paddr = vaddr; |
| 290 | unsigned64 memval; |
| 291 | |
| 292 | if ((vaddr & access) != 0) |
| 293 | SignalExceptionInstructionFetch (); |
| 294 | paddr = ((paddr & ~mask) | ((paddr & mask) ^ reverseendian)); |
| 295 | LoadMemory (&memval, NULL, access, paddr, vaddr, isINSTRUCTION, isREAL); |
| 296 | byte = ((vaddr & mask) ^ bigendiancpu); |
| 297 | return (memval >> (8 * byte)); |
| 298 | } |
| 299 | |
| 300 | |
| 301 | |
| 302 | /* Description from page A-26 of the "MIPS IV Instruction Set" manual (revision 3.1) */ |
| 303 | /* Order loads and stores to synchronise shared memory. Perform the |
| 304 | action necessary to make the effects of groups of synchronizable |
| 305 | loads and stores indicated by stype occur in the same order for all |
| 306 | processors. */ |
| 307 | INLINE_SIM_MAIN (void) |
| 308 | sync_operation (SIM_DESC sd, |
| 309 | sim_cpu *cpu, |
| 310 | address_word cia, |
| 311 | int stype) |
| 312 | { |
| 313 | #ifdef DEBUG |
| 314 | sim_io_printf(sd,"SyncOperation(%d) : TODO\n",stype); |
| 315 | #endif /* DEBUG */ |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | INLINE_SIM_MAIN (void) |
| 320 | cache_op (SIM_DESC SD, |
| 321 | sim_cpu *CPU, |
| 322 | address_word cia, |
| 323 | int op, |
| 324 | address_word pAddr, |
| 325 | address_word vAddr, |
| 326 | unsigned int instruction) |
| 327 | { |
| 328 | #if 1 /* stop warning message being displayed (we should really just remove the code) */ |
| 329 | static int icache_warning = 1; |
| 330 | static int dcache_warning = 1; |
| 331 | #else |
| 332 | static int icache_warning = 0; |
| 333 | static int dcache_warning = 0; |
| 334 | #endif |
| 335 | |
| 336 | /* If CP0 is not useable (User or Supervisor mode) and the CP0 |
| 337 | enable bit in the Status Register is clear - a coprocessor |
| 338 | unusable exception is taken. */ |
| 339 | #if 0 |
| 340 | sim_io_printf(SD,"TODO: Cache availability checking (PC = 0x%s)\n",pr_addr(cia)); |
| 341 | #endif |
| 342 | |
| 343 | switch (op & 0x3) { |
| 344 | case 0: /* instruction cache */ |
| 345 | switch (op >> 2) { |
| 346 | case 0: /* Index Invalidate */ |
| 347 | case 1: /* Index Load Tag */ |
| 348 | case 2: /* Index Store Tag */ |
| 349 | case 4: /* Hit Invalidate */ |
| 350 | case 5: /* Fill */ |
| 351 | case 6: /* Hit Writeback */ |
| 352 | if (!icache_warning) |
| 353 | { |
| 354 | sim_io_eprintf(SD,"Instruction CACHE operation %d to be coded\n",(op >> 2)); |
| 355 | icache_warning = 1; |
| 356 | } |
| 357 | break; |
| 358 | |
| 359 | default: |
| 360 | SignalException(ReservedInstruction,instruction); |
| 361 | break; |
| 362 | } |
| 363 | break; |
| 364 | |
| 365 | case 1: /* data cache */ |
| 366 | case 3: /* secondary data cache */ |
| 367 | switch (op >> 2) { |
| 368 | case 0: /* Index Writeback Invalidate */ |
| 369 | case 1: /* Index Load Tag */ |
| 370 | case 2: /* Index Store Tag */ |
| 371 | case 3: /* Create Dirty */ |
| 372 | case 4: /* Hit Invalidate */ |
| 373 | case 5: /* Hit Writeback Invalidate */ |
| 374 | case 6: /* Hit Writeback */ |
| 375 | if (!dcache_warning) |
| 376 | { |
| 377 | sim_io_eprintf(SD,"Data CACHE operation %d to be coded\n",(op >> 2)); |
| 378 | dcache_warning = 1; |
| 379 | } |
| 380 | break; |
| 381 | |
| 382 | default: |
| 383 | SignalException(ReservedInstruction,instruction); |
| 384 | break; |
| 385 | } |
| 386 | break; |
| 387 | |
| 388 | default: /* unrecognised cache ID */ |
| 389 | SignalException(ReservedInstruction,instruction); |
| 390 | break; |
| 391 | } |
| 392 | |
| 393 | return; |
| 394 | } |
| 395 | |
| 396 | |
| 397 | INLINE_SIM_MAIN (void) |
| 398 | pending_tick (SIM_DESC SD, |
| 399 | sim_cpu *CPU, |
| 400 | address_word cia) |
| 401 | { |
| 402 | if (PENDING_TRACE) |
| 403 | sim_io_eprintf (SD, "PENDING_DRAIN - 0x%lx - pending_in = %d, pending_out = %d, pending_total = %d\n", (unsigned long) cia, PENDING_IN, PENDING_OUT, PENDING_TOTAL); |
| 404 | if (PENDING_OUT != PENDING_IN) |
| 405 | { |
| 406 | int loop; |
| 407 | int index = PENDING_OUT; |
| 408 | int total = PENDING_TOTAL; |
| 409 | if (PENDING_TOTAL == 0) |
| 410 | sim_engine_abort (SD, CPU, cia, "PENDING_DRAIN - Mis-match on pending update pointers\n"); |
| 411 | for (loop = 0, index = PENDING_OUT; |
| 412 | (loop < total); |
| 413 | loop++, index = (index + 1) % PSLOTS) |
| 414 | { |
| 415 | if (PENDING_SLOT_DEST[index] != NULL) |
| 416 | { |
| 417 | PENDING_SLOT_DELAY[index] -= 1; |
| 418 | if (PENDING_SLOT_DELAY[index] == 0) |
| 419 | { |
| 420 | if (PENDING_TRACE) |
| 421 | sim_io_eprintf (SD, "PENDING_DRAIN - drained - index %d, dest 0x%lx, bit %d, val 0x%lx, size %d\n", |
| 422 | index, |
| 423 | (unsigned long) PENDING_SLOT_DEST[index], |
| 424 | PENDING_SLOT_BIT[index], |
| 425 | (unsigned long) PENDING_SLOT_VALUE[index], |
| 426 | PENDING_SLOT_SIZE[index]); |
| 427 | if (PENDING_SLOT_BIT[index] >= 0) |
| 428 | switch (PENDING_SLOT_SIZE[index]) |
| 429 | { |
| 430 | case 4: |
| 431 | if (PENDING_SLOT_VALUE[index]) |
| 432 | *(unsigned32*)PENDING_SLOT_DEST[index] |= |
| 433 | BIT32 (PENDING_SLOT_BIT[index]); |
| 434 | else |
| 435 | *(unsigned32*)PENDING_SLOT_DEST[index] &= |
| 436 | BIT32 (PENDING_SLOT_BIT[index]); |
| 437 | break; |
| 438 | case 8: |
| 439 | if (PENDING_SLOT_VALUE[index]) |
| 440 | *(unsigned64*)PENDING_SLOT_DEST[index] |= |
| 441 | BIT64 (PENDING_SLOT_BIT[index]); |
| 442 | else |
| 443 | *(unsigned64*)PENDING_SLOT_DEST[index] &= |
| 444 | BIT64 (PENDING_SLOT_BIT[index]); |
| 445 | break; |
| 446 | } |
| 447 | else |
| 448 | switch (PENDING_SLOT_SIZE[index]) |
| 449 | { |
| 450 | case 4: |
| 451 | *(unsigned32*)PENDING_SLOT_DEST[index] = |
| 452 | PENDING_SLOT_VALUE[index]; |
| 453 | break; |
| 454 | case 8: |
| 455 | *(unsigned64*)PENDING_SLOT_DEST[index] = |
| 456 | PENDING_SLOT_VALUE[index]; |
| 457 | break; |
| 458 | } |
| 459 | if (PENDING_OUT == index) |
| 460 | { |
| 461 | PENDING_SLOT_DEST[index] = NULL; |
| 462 | PENDING_OUT = (PENDING_OUT + 1) % PSLOTS; |
| 463 | PENDING_TOTAL--; |
| 464 | } |
| 465 | } |
| 466 | else if (PENDING_TRACE && PENDING_SLOT_DELAY[index] > 0) |
| 467 | sim_io_eprintf (SD, "PENDING_DRAIN - queued - index %d, delay %d, dest 0x%lx, bit %d, val 0x%lx, size %d\n", |
| 468 | index, PENDING_SLOT_DELAY[index], |
| 469 | (unsigned long) PENDING_SLOT_DEST[index], |
| 470 | PENDING_SLOT_BIT[index], |
| 471 | (unsigned long) PENDING_SLOT_VALUE[index], |
| 472 | PENDING_SLOT_SIZE[index]); |
| 473 | |
| 474 | } |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | |
| 480 | #endif |