| 1 | /* |
| 2 | * S/390 condition code helper routines |
| 3 | * |
| 4 | * Copyright (c) 2009 Ulrich Hecht |
| 5 | * Copyright (c) 2009 Alexander Graf |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This library 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 GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include "cpu.h" |
| 23 | #include "accel/tcg/cpu-loop.h" |
| 24 | #include "s390x-internal.h" |
| 25 | #include "tcg_s390x.h" |
| 26 | #include "exec/helper-proto.h" |
| 27 | #include "qemu/host-utils.h" |
| 28 | |
| 29 | /* #define DEBUG_HELPER */ |
| 30 | #ifdef DEBUG_HELPER |
| 31 | #define HELPER_LOG(x...) qemu_log(x) |
| 32 | #else |
| 33 | #define HELPER_LOG(x...) |
| 34 | #endif |
| 35 | |
| 36 | static uint32_t cc_calc_ltgt_32(int32_t src, int32_t dst) |
| 37 | { |
| 38 | if (src == dst) { |
| 39 | return 0; |
| 40 | } else if (src < dst) { |
| 41 | return 1; |
| 42 | } else { |
| 43 | return 2; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | static uint32_t cc_calc_ltgt0_32(int32_t dst) |
| 48 | { |
| 49 | return cc_calc_ltgt_32(dst, 0); |
| 50 | } |
| 51 | |
| 52 | static uint32_t cc_calc_ltgt_64(int64_t src, int64_t dst) |
| 53 | { |
| 54 | if (src == dst) { |
| 55 | return 0; |
| 56 | } else if (src < dst) { |
| 57 | return 1; |
| 58 | } else { |
| 59 | return 2; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | static uint32_t cc_calc_ltgt0_64(int64_t dst) |
| 64 | { |
| 65 | return cc_calc_ltgt_64(dst, 0); |
| 66 | } |
| 67 | |
| 68 | static uint32_t cc_calc_ltugtu_32(uint32_t src, uint32_t dst) |
| 69 | { |
| 70 | if (src == dst) { |
| 71 | return 0; |
| 72 | } else if (src < dst) { |
| 73 | return 1; |
| 74 | } else { |
| 75 | return 2; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | static uint32_t cc_calc_ltugtu_64(uint64_t src, uint64_t dst) |
| 80 | { |
| 81 | if (src == dst) { |
| 82 | return 0; |
| 83 | } else if (src < dst) { |
| 84 | return 1; |
| 85 | } else { |
| 86 | return 2; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static uint32_t cc_calc_tm_32(uint32_t val, uint32_t mask) |
| 91 | { |
| 92 | uint32_t r = val & mask; |
| 93 | |
| 94 | if (r == 0) { |
| 95 | return 0; |
| 96 | } else if (r == mask) { |
| 97 | return 3; |
| 98 | } else { |
| 99 | return 1; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | static uint32_t cc_calc_tm_64(uint64_t val, uint64_t mask) |
| 104 | { |
| 105 | uint64_t r = val & mask; |
| 106 | |
| 107 | if (r == 0) { |
| 108 | return 0; |
| 109 | } else if (r == mask) { |
| 110 | return 3; |
| 111 | } else { |
| 112 | int top = clz64(mask); |
| 113 | if ((int64_t)(val << top) < 0) { |
| 114 | return 2; |
| 115 | } else { |
| 116 | return 1; |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | static uint32_t cc_calc_nz(uint64_t dst) |
| 122 | { |
| 123 | return !!dst; |
| 124 | } |
| 125 | |
| 126 | static uint32_t cc_calc_addu(uint64_t carry_out, uint64_t result) |
| 127 | { |
| 128 | g_assert(carry_out <= 1); |
| 129 | return (result != 0) + 2 * carry_out; |
| 130 | } |
| 131 | |
| 132 | static uint32_t cc_calc_subu(uint64_t borrow_out, uint64_t result) |
| 133 | { |
| 134 | return cc_calc_addu(borrow_out + 1, result); |
| 135 | } |
| 136 | |
| 137 | static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar) |
| 138 | { |
| 139 | if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar >= 0)) { |
| 140 | return 3; /* overflow */ |
| 141 | } else { |
| 142 | if (ar < 0) { |
| 143 | return 1; |
| 144 | } else if (ar > 0) { |
| 145 | return 2; |
| 146 | } else { |
| 147 | return 0; |
| 148 | } |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar) |
| 153 | { |
| 154 | if ((a1 >= 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) { |
| 155 | return 3; /* overflow */ |
| 156 | } else { |
| 157 | if (ar < 0) { |
| 158 | return 1; |
| 159 | } else if (ar > 0) { |
| 160 | return 2; |
| 161 | } else { |
| 162 | return 0; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | static uint32_t cc_calc_abs_64(int64_t dst) |
| 168 | { |
| 169 | if ((uint64_t)dst == 0x8000000000000000ULL) { |
| 170 | return 3; |
| 171 | } else if (dst) { |
| 172 | return 2; |
| 173 | } else { |
| 174 | return 0; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | static uint32_t cc_calc_nabs_64(int64_t dst) |
| 179 | { |
| 180 | return !!dst; |
| 181 | } |
| 182 | |
| 183 | static uint32_t cc_calc_comp_64(int64_t dst) |
| 184 | { |
| 185 | if ((uint64_t)dst == 0x8000000000000000ULL) { |
| 186 | return 3; |
| 187 | } else if (dst < 0) { |
| 188 | return 1; |
| 189 | } else if (dst > 0) { |
| 190 | return 2; |
| 191 | } else { |
| 192 | return 0; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | |
| 197 | static uint32_t cc_calc_add_32(int32_t a1, int32_t a2, int32_t ar) |
| 198 | { |
| 199 | if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar >= 0)) { |
| 200 | return 3; /* overflow */ |
| 201 | } else { |
| 202 | if (ar < 0) { |
| 203 | return 1; |
| 204 | } else if (ar > 0) { |
| 205 | return 2; |
| 206 | } else { |
| 207 | return 0; |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar) |
| 213 | { |
| 214 | if ((a1 >= 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) { |
| 215 | return 3; /* overflow */ |
| 216 | } else { |
| 217 | if (ar < 0) { |
| 218 | return 1; |
| 219 | } else if (ar > 0) { |
| 220 | return 2; |
| 221 | } else { |
| 222 | return 0; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static uint32_t cc_calc_abs_32(int32_t dst) |
| 228 | { |
| 229 | if ((uint32_t)dst == 0x80000000UL) { |
| 230 | return 3; |
| 231 | } else if (dst) { |
| 232 | return 2; |
| 233 | } else { |
| 234 | return 0; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static uint32_t cc_calc_nabs_32(int32_t dst) |
| 239 | { |
| 240 | return !!dst; |
| 241 | } |
| 242 | |
| 243 | static uint32_t cc_calc_comp_32(int32_t dst) |
| 244 | { |
| 245 | if ((uint32_t)dst == 0x80000000UL) { |
| 246 | return 3; |
| 247 | } else if (dst < 0) { |
| 248 | return 1; |
| 249 | } else if (dst > 0) { |
| 250 | return 2; |
| 251 | } else { |
| 252 | return 0; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /* calculate condition code for insert character under mask insn */ |
| 257 | static uint32_t cc_calc_icm(uint64_t mask, uint64_t val) |
| 258 | { |
| 259 | if ((val & mask) == 0) { |
| 260 | return 0; |
| 261 | } else { |
| 262 | int top = clz64(mask); |
| 263 | if ((int64_t)(val << top) < 0) { |
| 264 | return 1; |
| 265 | } else { |
| 266 | return 2; |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | static uint32_t cc_calc_sla(uint64_t src, int shift) |
| 272 | { |
| 273 | uint64_t mask = -1ULL << (63 - shift); |
| 274 | uint64_t sign = 1ULL << 63; |
| 275 | uint64_t match; |
| 276 | int64_t r; |
| 277 | |
| 278 | /* Check if the sign bit stays the same. */ |
| 279 | if (src & sign) { |
| 280 | match = mask; |
| 281 | } else { |
| 282 | match = 0; |
| 283 | } |
| 284 | if ((src & mask) != match) { |
| 285 | /* Overflow. */ |
| 286 | return 3; |
| 287 | } |
| 288 | |
| 289 | r = ((src << shift) & ~sign) | (src & sign); |
| 290 | if (r == 0) { |
| 291 | return 0; |
| 292 | } else if (r < 0) { |
| 293 | return 1; |
| 294 | } |
| 295 | return 2; |
| 296 | } |
| 297 | |
| 298 | static uint32_t cc_calc_flogr(uint64_t dst) |
| 299 | { |
| 300 | return dst ? 2 : 0; |
| 301 | } |
| 302 | |
| 303 | static uint32_t cc_calc_lcbb(uint64_t dst) |
| 304 | { |
| 305 | return dst == 16 ? 0 : 3; |
| 306 | } |
| 307 | |
| 308 | static uint32_t cc_calc_vc(uint64_t low, uint64_t high) |
| 309 | { |
| 310 | if (high == -1ull && low == -1ull) { |
| 311 | /* all elements match */ |
| 312 | return 0; |
| 313 | } else if (high == 0 && low == 0) { |
| 314 | /* no elements match */ |
| 315 | return 3; |
| 316 | } else { |
| 317 | /* some elements but not all match */ |
| 318 | return 1; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | static uint32_t cc_calc_muls_32(int64_t res) |
| 323 | { |
| 324 | const int64_t tmp = res >> 31; |
| 325 | |
| 326 | if (!res) { |
| 327 | return 0; |
| 328 | } else if (tmp && tmp != -1) { |
| 329 | return 3; |
| 330 | } else if (res < 0) { |
| 331 | return 1; |
| 332 | } |
| 333 | return 2; |
| 334 | } |
| 335 | |
| 336 | static uint64_t cc_calc_muls_64(int64_t res_high, uint64_t res_low) |
| 337 | { |
| 338 | if (!res_high && !res_low) { |
| 339 | return 0; |
| 340 | } else if (res_high + (res_low >> 63) != 0) { |
| 341 | return 3; |
| 342 | } else if (res_high < 0) { |
| 343 | return 1; |
| 344 | } |
| 345 | return 2; |
| 346 | } |
| 347 | |
| 348 | static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op, |
| 349 | uint64_t src, uint64_t dst, uint64_t vr) |
| 350 | { |
| 351 | uint32_t r = 0; |
| 352 | |
| 353 | switch (cc_op) { |
| 354 | case CC_OP_CONST0: |
| 355 | case CC_OP_CONST1: |
| 356 | case CC_OP_CONST2: |
| 357 | case CC_OP_CONST3: |
| 358 | /* cc_op value _is_ cc */ |
| 359 | r = cc_op; |
| 360 | break; |
| 361 | case CC_OP_LTGT0_32: |
| 362 | r = cc_calc_ltgt0_32(dst); |
| 363 | break; |
| 364 | case CC_OP_LTGT0_64: |
| 365 | r = cc_calc_ltgt0_64(dst); |
| 366 | break; |
| 367 | case CC_OP_LTGT_32: |
| 368 | r = cc_calc_ltgt_32(src, dst); |
| 369 | break; |
| 370 | case CC_OP_LTGT_64: |
| 371 | r = cc_calc_ltgt_64(src, dst); |
| 372 | break; |
| 373 | case CC_OP_LTUGTU_32: |
| 374 | r = cc_calc_ltugtu_32(src, dst); |
| 375 | break; |
| 376 | case CC_OP_LTUGTU_64: |
| 377 | r = cc_calc_ltugtu_64(src, dst); |
| 378 | break; |
| 379 | case CC_OP_TM_32: |
| 380 | r = cc_calc_tm_32(src, dst); |
| 381 | break; |
| 382 | case CC_OP_TM_64: |
| 383 | r = cc_calc_tm_64(src, dst); |
| 384 | break; |
| 385 | case CC_OP_NZ: |
| 386 | r = cc_calc_nz(dst); |
| 387 | break; |
| 388 | case CC_OP_ADDU: |
| 389 | r = cc_calc_addu(src, dst); |
| 390 | break; |
| 391 | case CC_OP_SUBU: |
| 392 | r = cc_calc_subu(src, dst); |
| 393 | break; |
| 394 | case CC_OP_ADD_64: |
| 395 | r = cc_calc_add_64(src, dst, vr); |
| 396 | break; |
| 397 | case CC_OP_SUB_64: |
| 398 | r = cc_calc_sub_64(src, dst, vr); |
| 399 | break; |
| 400 | case CC_OP_ABS_64: |
| 401 | r = cc_calc_abs_64(dst); |
| 402 | break; |
| 403 | case CC_OP_NABS_64: |
| 404 | r = cc_calc_nabs_64(dst); |
| 405 | break; |
| 406 | case CC_OP_COMP_64: |
| 407 | r = cc_calc_comp_64(dst); |
| 408 | break; |
| 409 | case CC_OP_MULS_64: |
| 410 | r = cc_calc_muls_64(src, dst); |
| 411 | break; |
| 412 | |
| 413 | case CC_OP_ADD_32: |
| 414 | r = cc_calc_add_32(src, dst, vr); |
| 415 | break; |
| 416 | case CC_OP_SUB_32: |
| 417 | r = cc_calc_sub_32(src, dst, vr); |
| 418 | break; |
| 419 | case CC_OP_ABS_32: |
| 420 | r = cc_calc_abs_32(dst); |
| 421 | break; |
| 422 | case CC_OP_NABS_32: |
| 423 | r = cc_calc_nabs_32(dst); |
| 424 | break; |
| 425 | case CC_OP_COMP_32: |
| 426 | r = cc_calc_comp_32(dst); |
| 427 | break; |
| 428 | case CC_OP_MULS_32: |
| 429 | r = cc_calc_muls_32(dst); |
| 430 | break; |
| 431 | |
| 432 | case CC_OP_ICM: |
| 433 | r = cc_calc_icm(src, dst); |
| 434 | break; |
| 435 | case CC_OP_SLA: |
| 436 | r = cc_calc_sla(src, dst); |
| 437 | break; |
| 438 | case CC_OP_FLOGR: |
| 439 | r = cc_calc_flogr(dst); |
| 440 | break; |
| 441 | case CC_OP_LCBB: |
| 442 | r = cc_calc_lcbb(dst); |
| 443 | break; |
| 444 | case CC_OP_VC: |
| 445 | r = cc_calc_vc(src, dst); |
| 446 | break; |
| 447 | |
| 448 | case CC_OP_NZ_F32: |
| 449 | r = set_cc_nz_f32(dst); |
| 450 | break; |
| 451 | case CC_OP_NZ_F64: |
| 452 | r = set_cc_nz_f64(dst); |
| 453 | break; |
| 454 | case CC_OP_NZ_F128: |
| 455 | r = set_cc_nz_f128(make_float128(src, dst)); |
| 456 | break; |
| 457 | |
| 458 | default: |
| 459 | cpu_abort(env_cpu(env), "Unknown CC operation: %s\n", cc_name(cc_op)); |
| 460 | } |
| 461 | |
| 462 | HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__, |
| 463 | cc_name(cc_op), src, dst, vr, r); |
| 464 | return r; |
| 465 | } |
| 466 | |
| 467 | uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst, |
| 468 | uint64_t vr) |
| 469 | { |
| 470 | return do_calc_cc(env, cc_op, src, dst, vr); |
| 471 | } |
| 472 | |
| 473 | uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src, |
| 474 | uint64_t dst, uint64_t vr) |
| 475 | { |
| 476 | return do_calc_cc(env, cc_op, src, dst, vr); |
| 477 | } |
| 478 | |
| 479 | #ifndef CONFIG_USER_ONLY |
| 480 | void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr) |
| 481 | { |
| 482 | s390_cpu_set_psw(env, mask, addr); |
| 483 | cpu_loop_exit(env_cpu(env)); |
| 484 | } |
| 485 | |
| 486 | void HELPER(sacf)(CPUS390XState *env, uint64_t a1) |
| 487 | { |
| 488 | HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1); |
| 489 | |
| 490 | if (!(env->psw.mask & PSW_MASK_DAT)) { |
| 491 | tcg_s390_program_interrupt(env, PGM_SPECIAL_OP, GETPC()); |
| 492 | } |
| 493 | |
| 494 | switch (a1 & 0xf00) { |
| 495 | case 0x000: |
| 496 | env->psw.mask &= ~PSW_MASK_ASC; |
| 497 | env->psw.mask |= PSW_ASC_PRIMARY; |
| 498 | break; |
| 499 | case 0x100: |
| 500 | env->psw.mask &= ~PSW_MASK_ASC; |
| 501 | env->psw.mask |= PSW_ASC_SECONDARY; |
| 502 | break; |
| 503 | case 0x300: |
| 504 | if ((env->psw.mask & PSW_MASK_PSTATE) != 0) { |
| 505 | tcg_s390_program_interrupt(env, PGM_PRIVILEGED, GETPC()); |
| 506 | } |
| 507 | env->psw.mask &= ~PSW_MASK_ASC; |
| 508 | env->psw.mask |= PSW_ASC_HOME; |
| 509 | break; |
| 510 | default: |
| 511 | HELPER_LOG("unknown sacf mode: %" PRIx64 "\n", a1); |
| 512 | tcg_s390_program_interrupt(env, PGM_SPECIFICATION, GETPC()); |
| 513 | } |
| 514 | } |
| 515 | #endif |