| 1 | /* reg.c --- register set model for RX simulator. |
| 2 | |
| 3 | Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| 4 | Contributed by Red Hat, Inc. |
| 5 | |
| 6 | This file is part of the GNU simulators. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | |
| 22 | #include "config.h" |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include "cpu.h" |
| 28 | #include "bfd.h" |
| 29 | #include "trace.h" |
| 30 | |
| 31 | int verbose = 0; |
| 32 | int trace = 0; |
| 33 | int enable_counting = 0; |
| 34 | |
| 35 | int rx_in_gdb = 1; |
| 36 | |
| 37 | int rx_flagmask; |
| 38 | int rx_flagand; |
| 39 | int rx_flagor; |
| 40 | |
| 41 | int rx_big_endian; |
| 42 | regs_type regs; |
| 43 | int step_result; |
| 44 | unsigned int heapbottom = 0; |
| 45 | unsigned int heaptop = 0; |
| 46 | |
| 47 | char *reg_names[] = { |
| 48 | /* general registers */ |
| 49 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 50 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 51 | /* control register */ |
| 52 | "psw", "pc", "usp", "fpsw", "RES", "RES", "RES", "RES", |
| 53 | "bpsw", "bpc", "isp", "fintv", "intb", "RES", "RES", "RES", |
| 54 | "RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES", |
| 55 | "RES", "RES", "RES", "RES", "RES", "RES", "RES", "RES", |
| 56 | "temp", "acc", "acchi", "accmi", "acclo" |
| 57 | }; |
| 58 | |
| 59 | unsigned int b2mask[] = { 0, 0xff, 0xffff, 0xffffff, 0xffffffff }; |
| 60 | unsigned int b2signbit[] = { 0, (1 << 7), (1 << 15), (1 << 24), (1 << 31) }; |
| 61 | int b2maxsigned[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffff }; |
| 62 | int b2minsigned[] = { 0, -128, -32768, -8388608, -2147483647 - 1 }; |
| 63 | |
| 64 | static regs_type oldregs; |
| 65 | |
| 66 | void |
| 67 | init_regs (void) |
| 68 | { |
| 69 | memset (®s, 0, sizeof (regs)); |
| 70 | memset (&oldregs, 0, sizeof (oldregs)); |
| 71 | |
| 72 | #ifdef CYCLE_ACCURATE |
| 73 | regs.rt = -1; |
| 74 | oldregs.rt = -1; |
| 75 | #endif |
| 76 | } |
| 77 | |
| 78 | static unsigned int |
| 79 | get_reg_i (int id) |
| 80 | { |
| 81 | if (id == 0) |
| 82 | return regs.r_psw & FLAGBIT_U ? regs.r_usp : regs.r_isp; |
| 83 | |
| 84 | if (id >= 1 && id <= 15) |
| 85 | return regs.r[id]; |
| 86 | |
| 87 | switch (id) |
| 88 | { |
| 89 | case psw: |
| 90 | return regs.r_psw; |
| 91 | case fpsw: |
| 92 | return regs.r_fpsw; |
| 93 | case isp: |
| 94 | return regs.r_isp; |
| 95 | case usp: |
| 96 | return regs.r_usp; |
| 97 | case bpc: |
| 98 | return regs.r_bpc; |
| 99 | case bpsw: |
| 100 | return regs.r_bpsw; |
| 101 | case fintv: |
| 102 | return regs.r_fintv; |
| 103 | case intb: |
| 104 | return regs.r_intb; |
| 105 | case pc: |
| 106 | return regs.r_pc; |
| 107 | case r_temp_idx: |
| 108 | return regs.r_temp; |
| 109 | case acchi: |
| 110 | return (SI)(regs.r_acc >> 32); |
| 111 | case accmi: |
| 112 | return (SI)(regs.r_acc >> 16); |
| 113 | case acclo: |
| 114 | return (SI)regs.r_acc; |
| 115 | } |
| 116 | abort(); |
| 117 | } |
| 118 | |
| 119 | unsigned int |
| 120 | get_reg (int id) |
| 121 | { |
| 122 | unsigned int rv = get_reg_i (id); |
| 123 | if (trace > ((id != pc && id != sp) ? 0 : 1)) |
| 124 | printf ("get_reg (%s) = %08x\n", reg_names[id], rv); |
| 125 | return rv; |
| 126 | } |
| 127 | |
| 128 | static unsigned long long |
| 129 | get_reg64_i (int id) |
| 130 | { |
| 131 | switch (id) |
| 132 | { |
| 133 | case acc64: |
| 134 | return regs.r_acc; |
| 135 | default: |
| 136 | abort (); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | unsigned long long |
| 141 | get_reg64 (int id) |
| 142 | { |
| 143 | unsigned long long rv = get_reg64_i (id); |
| 144 | if (trace > ((id != pc && id != sp) ? 0 : 1)) |
| 145 | printf ("get_reg (%s) = %016llx\n", reg_names[id], rv); |
| 146 | return rv; |
| 147 | } |
| 148 | |
| 149 | static int highest_sp = 0, lowest_sp = 0xffffff; |
| 150 | |
| 151 | void |
| 152 | stack_heap_stats () |
| 153 | { |
| 154 | if (heapbottom < heaptop) |
| 155 | printf ("heap: %08x - %08x (%d bytes)\n", heapbottom, heaptop, |
| 156 | heaptop - heapbottom); |
| 157 | if (lowest_sp < highest_sp) |
| 158 | printf ("stack: %08x - %08x (%d bytes)\n", lowest_sp, highest_sp, |
| 159 | highest_sp - lowest_sp); |
| 160 | } |
| 161 | |
| 162 | void |
| 163 | put_reg (int id, unsigned int v) |
| 164 | { |
| 165 | if (trace > ((id != pc) ? 0 : 1)) |
| 166 | printf ("put_reg (%s) = %08x\n", reg_names[id], v); |
| 167 | |
| 168 | |
| 169 | switch (id) |
| 170 | { |
| 171 | case psw: |
| 172 | regs.r_psw = v; |
| 173 | break; |
| 174 | case fpsw: |
| 175 | { |
| 176 | SI anded; |
| 177 | /* This is an odd one - The Cx flags are AND'd, and the FS flag |
| 178 | is synthetic. */ |
| 179 | anded = regs.r_fpsw & v; |
| 180 | anded |= ~ FPSWBITS_CMASK; |
| 181 | regs.r_fpsw = v & anded; |
| 182 | if (regs.r_fpsw & FPSWBITS_FMASK) |
| 183 | regs.r_fpsw |= FPSWBITS_FSUM; |
| 184 | else |
| 185 | regs.r_fpsw &= ~FPSWBITS_FSUM; |
| 186 | } |
| 187 | break; |
| 188 | case isp: |
| 189 | regs.r_isp = v; |
| 190 | break; |
| 191 | case usp: |
| 192 | regs.r_usp = v; |
| 193 | break; |
| 194 | case bpc: |
| 195 | regs.r_bpc = v; |
| 196 | break; |
| 197 | case bpsw: |
| 198 | regs.r_bpsw = v; |
| 199 | break; |
| 200 | case fintv: |
| 201 | regs.r_fintv = v; |
| 202 | break; |
| 203 | case intb: |
| 204 | regs.r_intb = v; |
| 205 | break; |
| 206 | case pc: |
| 207 | regs.r_pc = v; |
| 208 | break; |
| 209 | |
| 210 | case acchi: |
| 211 | regs.r_acc = (regs.r_acc & 0xffffffffULL) | ((DI)v << 32); |
| 212 | break; |
| 213 | case accmi: |
| 214 | regs.r_acc = (regs.r_acc & ~0xffffffff0000ULL) | ((DI)v << 16); |
| 215 | break; |
| 216 | case acclo: |
| 217 | regs.r_acc = (regs.r_acc & ~0xffffffffULL) | ((DI)v); |
| 218 | break; |
| 219 | |
| 220 | case 0: /* Stack pointer is "in" R0. */ |
| 221 | { |
| 222 | if (v < heaptop) |
| 223 | { |
| 224 | unsigned int line; |
| 225 | const char * dummy; |
| 226 | const char * fname = NULL; |
| 227 | |
| 228 | sim_get_current_source_location (& dummy, & fname, &line); |
| 229 | |
| 230 | /* The setjmp and longjmp functions play tricks with the stack pointer. */ |
| 231 | if (fname == NULL |
| 232 | || (strcmp (fname, "_setjmp") != 0 |
| 233 | && strcmp (fname, "_longjmp") != 0)) |
| 234 | { |
| 235 | printf ("collision in %s: pc %08x heap %08x stack %08x\n", |
| 236 | fname, (unsigned int) regs.r_pc, heaptop, v); |
| 237 | exit (1); |
| 238 | } |
| 239 | } |
| 240 | else |
| 241 | { |
| 242 | if (v < lowest_sp) |
| 243 | lowest_sp = v; |
| 244 | if (v > highest_sp) |
| 245 | highest_sp = v; |
| 246 | } |
| 247 | |
| 248 | if (regs.r_psw & FLAGBIT_U) |
| 249 | regs.r_usp = v; |
| 250 | else |
| 251 | regs.r_isp = v; |
| 252 | break; |
| 253 | } |
| 254 | |
| 255 | default: |
| 256 | if (id >= 1 && id <= 15) |
| 257 | regs.r[id] = v; |
| 258 | else |
| 259 | abort (); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | void |
| 264 | put_reg64 (int id, unsigned long long v) |
| 265 | { |
| 266 | if (trace > ((id != pc) ? 0 : 1)) |
| 267 | printf ("put_reg (%s) = %016llx\n", reg_names[id], v); |
| 268 | |
| 269 | switch (id) |
| 270 | { |
| 271 | case acc64: |
| 272 | regs.r_acc = v; |
| 273 | break; |
| 274 | default: |
| 275 | abort (); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | int |
| 280 | condition_true (int cond_id) |
| 281 | { |
| 282 | int f; |
| 283 | |
| 284 | static const char *cond_name[] = { |
| 285 | "Z", |
| 286 | "!Z", |
| 287 | "C", |
| 288 | "!C", |
| 289 | "C&!Z", |
| 290 | "!(C&!Z)", |
| 291 | "!S", |
| 292 | "S", |
| 293 | "!(S^O)", |
| 294 | "S^O", |
| 295 | "!((S^O)|Z)", |
| 296 | "(S^O)|Z", |
| 297 | "O", |
| 298 | "!O", |
| 299 | "always", |
| 300 | "never" |
| 301 | }; |
| 302 | switch (cond_id & 15) |
| 303 | { |
| 304 | case 0: |
| 305 | f = FLAG_Z; |
| 306 | break; /* EQ/Z */ |
| 307 | case 1: |
| 308 | f = !FLAG_Z; |
| 309 | break; /* NE/NZ */ |
| 310 | case 2: |
| 311 | f = FLAG_C; |
| 312 | break; /* GEU/C */ |
| 313 | case 3: |
| 314 | f = !FLAG_C; |
| 315 | break; /* LTU/NC */ |
| 316 | case 4: |
| 317 | f = FLAG_C & !FLAG_Z; |
| 318 | break; /* GTU */ |
| 319 | case 5: |
| 320 | f = !(FLAG_C & !FLAG_Z); |
| 321 | break; /* LEU */ |
| 322 | case 6: |
| 323 | f = !FLAG_S; |
| 324 | break; /* PZ */ |
| 325 | case 7: |
| 326 | f = FLAG_S; |
| 327 | break; /* N */ |
| 328 | |
| 329 | case 8: |
| 330 | f = !(FLAG_S ^ FLAG_O); |
| 331 | break; /* GE */ |
| 332 | case 9: |
| 333 | f = FLAG_S ^ FLAG_O; |
| 334 | break; /* LT */ |
| 335 | case 10: |
| 336 | f = !((FLAG_S ^ FLAG_O) | FLAG_Z); |
| 337 | break; /* GT */ |
| 338 | case 11: |
| 339 | f = (FLAG_S ^ FLAG_O) | FLAG_Z; |
| 340 | break; /* LE */ |
| 341 | case 12: |
| 342 | f = FLAG_O; |
| 343 | break; /* O */ |
| 344 | case 13: |
| 345 | f = !FLAG_O; |
| 346 | break; /* NO */ |
| 347 | case 14: |
| 348 | f = 1; /* always */ |
| 349 | break; |
| 350 | default: |
| 351 | f = 0; /* never */ |
| 352 | break; |
| 353 | } |
| 354 | if (trace && ((cond_id & 15) != 14)) |
| 355 | printf ("cond[%d] %s = %s\n", cond_id, cond_name[cond_id & 15], |
| 356 | f ? "true" : "false"); |
| 357 | return f; |
| 358 | } |
| 359 | |
| 360 | void |
| 361 | set_flags (int mask, int newbits) |
| 362 | { |
| 363 | regs.r_psw &= rx_flagand; |
| 364 | regs.r_psw |= rx_flagor; |
| 365 | regs.r_psw |= (newbits & mask & rx_flagmask); |
| 366 | |
| 367 | if (trace) |
| 368 | { |
| 369 | int i; |
| 370 | printf ("flags now \033[32m %d", (int)((regs.r_psw >> 24) & 7)); |
| 371 | for (i = 17; i >= 0; i--) |
| 372 | if (0x3000f & (1 << i)) |
| 373 | { |
| 374 | if (regs.r_psw & (1 << i)) |
| 375 | putchar ("CZSO------------IU"[i]); |
| 376 | else |
| 377 | putchar ('-'); |
| 378 | } |
| 379 | printf ("\033[0m\n"); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | void |
| 384 | set_oszc (long long value, int b, int c) |
| 385 | { |
| 386 | unsigned int mask = b2mask[b]; |
| 387 | int f = 0; |
| 388 | |
| 389 | if (c) |
| 390 | f |= FLAGBIT_C; |
| 391 | if ((value & mask) == 0) |
| 392 | f |= FLAGBIT_Z; |
| 393 | if (value & b2signbit[b]) |
| 394 | f |= FLAGBIT_S; |
| 395 | if ((value > b2maxsigned[b]) || (value < b2minsigned[b])) |
| 396 | f |= FLAGBIT_O; |
| 397 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O | FLAGBIT_C, f); |
| 398 | } |
| 399 | |
| 400 | void |
| 401 | set_szc (long long value, int b, int c) |
| 402 | { |
| 403 | unsigned int mask = b2mask[b]; |
| 404 | int f = 0; |
| 405 | |
| 406 | if (c) |
| 407 | f |= FLAGBIT_C; |
| 408 | if ((value & mask) == 0) |
| 409 | f |= FLAGBIT_Z; |
| 410 | if (value & b2signbit[b]) |
| 411 | f |= FLAGBIT_S; |
| 412 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_C, f); |
| 413 | } |
| 414 | |
| 415 | void |
| 416 | set_osz (long long value, int b) |
| 417 | { |
| 418 | unsigned int mask = b2mask[b]; |
| 419 | int f = 0; |
| 420 | |
| 421 | if ((value & mask) == 0) |
| 422 | f |= FLAGBIT_Z; |
| 423 | if (value & b2signbit[b]) |
| 424 | f |= FLAGBIT_S; |
| 425 | if ((value > b2maxsigned[b]) || (value < b2minsigned[b])) |
| 426 | f |= FLAGBIT_O; |
| 427 | set_flags (FLAGBIT_Z | FLAGBIT_S | FLAGBIT_O, f); |
| 428 | } |
| 429 | |
| 430 | void |
| 431 | set_sz (long long value, int b) |
| 432 | { |
| 433 | unsigned int mask = b2mask[b]; |
| 434 | int f = 0; |
| 435 | |
| 436 | if ((value & mask) == 0) |
| 437 | f |= FLAGBIT_Z; |
| 438 | if (value & b2signbit[b]) |
| 439 | f |= FLAGBIT_S; |
| 440 | set_flags (FLAGBIT_Z | FLAGBIT_S, f); |
| 441 | } |
| 442 | |
| 443 | void |
| 444 | set_zc (int z, int c) |
| 445 | { |
| 446 | set_flags (FLAGBIT_C | FLAGBIT_Z, |
| 447 | (c ? FLAGBIT_C : 0) | (z ? FLAGBIT_Z : 0)); |
| 448 | } |
| 449 | |
| 450 | void |
| 451 | set_c (int c) |
| 452 | { |
| 453 | set_flags (FLAGBIT_C, c ? FLAGBIT_C : 0); |
| 454 | } |
| 455 | |
| 456 | static char * |
| 457 | psw2str(int rpsw) |
| 458 | { |
| 459 | static char buf[10]; |
| 460 | char *bp = buf; |
| 461 | int i, ipl; |
| 462 | |
| 463 | ipl = (rpsw & FLAGBITS_IPL) >> FLAGSHIFT_IPL; |
| 464 | if (ipl > 9) |
| 465 | { |
| 466 | *bp++ = (ipl / 10) + '0'; |
| 467 | ipl %= 10; |
| 468 | } |
| 469 | *bp++ = ipl + '0'; |
| 470 | for (i = 20; i >= 0; i--) |
| 471 | if (0x13000f & (1 << i)) |
| 472 | { |
| 473 | if (rpsw & (1 << i)) |
| 474 | *bp++ = "CZSO------------IU--P"[i]; |
| 475 | else |
| 476 | *bp++ = '-'; |
| 477 | } |
| 478 | *bp = 0; |
| 479 | return buf; |
| 480 | } |
| 481 | |
| 482 | static char * |
| 483 | fpsw2str(int rpsw) |
| 484 | { |
| 485 | static char buf[100]; |
| 486 | char *bp = buf; |
| 487 | int i; /* ---+---+---+---+---+---+---+---+ */ |
| 488 | const char s1[] = "FFFFFF-----------EEEEE-DCCCCCCRR"; |
| 489 | const char s2[] = "SXUZOV-----------XUZOV-NEXUZOV01"; |
| 490 | const char rm[4][3] = { "RC", "RZ", "RP", "RN" }; |
| 491 | |
| 492 | for (i = 31; i >= 0; i--) |
| 493 | if (0xfc007dfc & (1 << i)) |
| 494 | { |
| 495 | if (rpsw & (1 << i)) |
| 496 | { |
| 497 | if (bp > buf) |
| 498 | *bp++ = '.'; |
| 499 | *bp++ = s1[31-i]; |
| 500 | *bp++ = s2[31-i]; |
| 501 | } |
| 502 | } |
| 503 | if (bp > buf) |
| 504 | *bp++ = '.'; |
| 505 | strcpy (bp, rm[rpsw&3]); |
| 506 | return buf; |
| 507 | } |
| 508 | |
| 509 | #define TRC(f,n) \ |
| 510 | if (oldregs.f != regs.f) \ |
| 511 | { \ |
| 512 | if (tag) { printf (tag); tag = 0; } \ |
| 513 | printf(" %s %08x:%08x", n, \ |
| 514 | (unsigned int)oldregs.f, \ |
| 515 | (unsigned int)regs.f); \ |
| 516 | oldregs.f = regs.f; \ |
| 517 | } |
| 518 | |
| 519 | void |
| 520 | trace_register_changes (void) |
| 521 | { |
| 522 | char *tag = "\033[36mREGS:"; |
| 523 | int i; |
| 524 | |
| 525 | if (!trace) |
| 526 | return; |
| 527 | for (i=1; i<16; i++) |
| 528 | TRC (r[i], reg_names[i]); |
| 529 | TRC (r_intb, "intb"); |
| 530 | TRC (r_usp, "usp"); |
| 531 | TRC (r_isp, "isp"); |
| 532 | if (oldregs.r_psw != regs.r_psw) |
| 533 | { |
| 534 | if (tag) { printf (tag); tag = 0; } |
| 535 | printf(" psw %s:", psw2str(oldregs.r_psw)); |
| 536 | printf("%s", psw2str(regs.r_psw)); |
| 537 | oldregs.r_psw = regs.r_psw; |
| 538 | } |
| 539 | |
| 540 | if (oldregs.r_fpsw != regs.r_fpsw) |
| 541 | { |
| 542 | if (tag) { printf (tag); tag = 0; } |
| 543 | printf(" fpsw %s:", fpsw2str(oldregs.r_fpsw)); |
| 544 | printf("%s", fpsw2str(regs.r_fpsw)); |
| 545 | oldregs.r_fpsw = regs.r_fpsw; |
| 546 | } |
| 547 | |
| 548 | if (oldregs.r_acc != regs.r_acc) |
| 549 | { |
| 550 | if (tag) { printf (tag); tag = 0; } |
| 551 | printf(" acc %016llx:", oldregs.r_acc); |
| 552 | printf("%016llx", regs.r_acc); |
| 553 | oldregs.r_acc = regs.r_acc; |
| 554 | } |
| 555 | |
| 556 | if (tag == 0) |
| 557 | printf ("\033[0m\n"); |
| 558 | } |