target-microblaze/op_helper.c

   1 /*
   2  *  Microblaze helper routines.
   3  *
   4  *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <assert.h>
  21 #include "exec.h"
  22 #include "helper.h"
  23 #include "host-utils.h"
  24
  25 #define D(x)
  26
  27 #if !defined(CONFIG_USER_ONLY)
  28 #define MMUSUFFIX _mmu
  29 #define SHIFT 0
  30 #include "softmmu_template.h"
  31 #define SHIFT 1
  32 #include "softmmu_template.h"
  33 #define SHIFT 2
  34 #include "softmmu_template.h"
  35 #define SHIFT 3
  36 #include "softmmu_template.h"
  37
  38 /* Try to fill the TLB and return an exception if error. If retaddr is
  39    NULL, it means that the function was called in C code (i.e. not
  40    from generated code or from helper.c) */
  41 /* XXX: fix it to restore all registers */
  42 void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
  43 {
  44     TranslationBlock *tb;
  45     CPUState *saved_env;
  46     unsigned long pc;
  47     int ret;
  48
  49     /* XXX: hack to restore env in all cases, even if not called from
  50        generated code */
  51     saved_env = env;
  52     env = cpu_single_env;
  53
  54     ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
  55     if (unlikely(ret)) {
  56         if (retaddr) {
  57             /* now we have a real cpu fault */
  58             pc = (unsigned long)retaddr;
  59             tb = tb_find_pc(pc);
  60             if (tb) {
  61                 /* the PC is inside the translated code. It means that we have
  62                    a virtual CPU fault */
  63                 cpu_restore_state(tb, env, pc, NULL);
  64             }
  65         }
  66         cpu_loop_exit();
  67     }
  68     env = saved_env;
  69 }
  70 #endif
  71
  72 void helper_raise_exception(uint32_t index)
  73 {
  74     env->exception_index = index;
  75     cpu_loop_exit();
  76 }
  77
  78 void helper_debug(void)
  79 {
  80     int i;
  81
  82     qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
  83     qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
  84              env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
  85              env->debug, env->imm, env->iflags);
  86     qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
  87              env->btaken, env->btarget,
  88              (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
  89              (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
  90              (env->sregs[SR_MSR] & MSR_EIP),
  91              (env->sregs[SR_MSR] & MSR_IE));
  92     for (i = 0; i < 32; i++) {
  93         qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
  94         if ((i + 1) % 4 == 0)
  95             qemu_log("\n");
  96     }
  97     qemu_log("\n\n");
  98 }
  99
 100 static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
 101 {
 102     uint32_t cout = 0;
 103
 104     if ((b == ~0) && cin)
 105         cout = 1;
 106     else if ((~0 - a) < (b + cin))
 107         cout = 1;
 108     return cout;
 109 }
 110
 111 uint32_t helper_cmp(uint32_t a, uint32_t b)
 112 {
 113     uint32_t t;
 114
 115     t = b + ~a + 1;
 116     if ((b & 0x80000000) ^ (a & 0x80000000))
 117         t = (t & 0x7fffffff) | (b & 0x80000000);
 118     return t;
 119 }
 120
 121 uint32_t helper_cmpu(uint32_t a, uint32_t b)
 122 {
 123     uint32_t t;
 124
 125     t = b + ~a + 1;
 126     if ((b & 0x80000000) ^ (a & 0x80000000))
 127         t = (t & 0x7fffffff) | (a & 0x80000000);
 128     return t;
 129 }
 130
 131 uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
 132 {
 133     uint32_t d, cf = 0, ncf;
 134
 135     if (c)
 136         cf = env->sregs[SR_MSR] >> 31;
 137     assert(cf == 0 || cf == 1);
 138     d = a + b + cf;
 139
 140     if (!k) {
 141         ncf = compute_carry(a, b, cf);
 142         assert(ncf == 0 || ncf == 1);
 143         if (ncf)
 144             env->sregs[SR_MSR] |= MSR_C | MSR_CC;
 145         else
 146             env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC);
 147     }
 148     D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
 149                d, a, b, cf, ncf, k, c));
 150     return d;
 151 }
 152
 153 uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c)
 154 {
 155     uint32_t d, cf = 1, ncf;
 156
 157     if (c)
 158         cf = env->sregs[SR_MSR] >> 31;
 159     assert(cf == 0 || cf == 1);
 160     d = b + ~a + cf;
 161
 162     if (!k) {
 163         ncf = compute_carry(b, ~a, cf);
 164         assert(ncf == 0 || ncf == 1);
 165         if (ncf)
 166             env->sregs[SR_MSR] |= MSR_C | MSR_CC;
 167         else
 168             env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC);
 169     }
 170     D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n",
 171                d, a, b, cf, ncf, k, c));
 172     return d;
 173 }
 174
 175 static inline int div_prepare(uint32_t a, uint32_t b)
 176 {
 177     if (b == 0) {
 178         env->sregs[SR_MSR] |= MSR_DZ;
 179
 180         if ((env->sregs[SR_MSR] & MSR_EE)
 181             && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
 182             env->sregs[SR_ESR] = ESR_EC_DIVZERO;
 183             helper_raise_exception(EXCP_HW_EXCP);
 184         }
 185         return 0;
 186     }
 187     env->sregs[SR_MSR] &= ~MSR_DZ;
 188     return 1;
 189 }
 190
 191 uint32_t helper_divs(uint32_t a, uint32_t b)
 192 {
 193     if (!div_prepare(a, b))
 194         return 0;
 195     return (int32_t)a / (int32_t)b;
 196 }
 197
 198 uint32_t helper_divu(uint32_t a, uint32_t b)
 199 {
 200     if (!div_prepare(a, b))
 201         return 0;
 202     return a / b;
 203 }
 204
 205 /* raise FPU exception.  */
 206 static void raise_fpu_exception(void)
 207 {
 208     env->sregs[SR_ESR] = ESR_EC_FPU;
 209     helper_raise_exception(EXCP_HW_EXCP);
 210 }
 211
 212 static void update_fpu_flags(int flags)
 213 {
 214     int raise = 0;
 215
 216     if (flags & float_flag_invalid) {
 217         env->sregs[SR_FSR] |= FSR_IO;
 218         raise = 1;
 219     }
 220     if (flags & float_flag_divbyzero) {
 221         env->sregs[SR_FSR] |= FSR_DZ;
 222         raise = 1;
 223     }
 224     if (flags & float_flag_overflow) {
 225         env->sregs[SR_FSR] |= FSR_OF;
 226         raise = 1;
 227     }
 228     if (flags & float_flag_underflow) {
 229         env->sregs[SR_FSR] |= FSR_UF;
 230         raise = 1;
 231     }
 232     if (raise
 233         && (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
 234         && (env->sregs[SR_MSR] & MSR_EE)) {
 235         raise_fpu_exception();
 236     }
 237 }
 238
 239 uint32_t helper_fadd(uint32_t a, uint32_t b)
 240 {
 241     CPU_FloatU fd, fa, fb;
 242     int flags;
 243
 244     set_float_exception_flags(0, &env->fp_status);
 245     fa.l = a;
 246     fb.l = b;
 247     fd.f = float32_add(fa.f, fb.f, &env->fp_status);
 248
 249     flags = get_float_exception_flags(&env->fp_status);
 250     update_fpu_flags(flags);
 251     return fd.l;
 252 }
 253
 254 uint32_t helper_frsub(uint32_t a, uint32_t b)
 255 {
 256     CPU_FloatU fd, fa, fb;
 257     int flags;
 258
 259     set_float_exception_flags(0, &env->fp_status);
 260     fa.l = a;
 261     fb.l = b;
 262     fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
 263     flags = get_float_exception_flags(&env->fp_status);
 264     update_fpu_flags(flags);
 265     return fd.l;
 266 }
 267
 268 uint32_t helper_fmul(uint32_t a, uint32_t b)
 269 {
 270     CPU_FloatU fd, fa, fb;
 271     int flags;
 272
 273     set_float_exception_flags(0, &env->fp_status);
 274     fa.l = a;
 275     fb.l = b;
 276     fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
 277     flags = get_float_exception_flags(&env->fp_status);
 278     update_fpu_flags(flags);
 279
 280     return fd.l;
 281 }
 282
 283 uint32_t helper_fdiv(uint32_t a, uint32_t b)
 284 {
 285     CPU_FloatU fd, fa, fb;
 286     int flags;
 287
 288     set_float_exception_flags(0, &env->fp_status);
 289     fa.l = a;
 290     fb.l = b;
 291     fd.f = float32_div(fb.f, fa.f, &env->fp_status);
 292     flags = get_float_exception_flags(&env->fp_status);
 293     update_fpu_flags(flags);
 294
 295     return fd.l;
 296 }
 297
 298 uint32_t helper_fcmp_un(uint32_t a, uint32_t b)
 299 {
 300     CPU_FloatU fa, fb;
 301     uint32_t r = 0;
 302
 303     fa.l = a;
 304     fb.l = b;
 305
 306     if (float32_is_signaling_nan(fa.f) || float32_is_signaling_nan(fb.f)) {
 307         update_fpu_flags(float_flag_invalid);
 308         r = 1;
 309     }
 310
 311     if (float32_is_nan(fa.f) || float32_is_nan(fb.f)) {
 312         r = 1;
 313     }
 314
 315     return r;
 316 }
 317
 318 uint32_t helper_fcmp_lt(uint32_t a, uint32_t b)
 319 {
 320     CPU_FloatU fa, fb;
 321     int r;
 322     int flags;
 323
 324     set_float_exception_flags(0, &env->fp_status);
 325     fa.l = a;
 326     fb.l = b;
 327     r = float32_lt(fb.f, fa.f, &env->fp_status);
 328     flags = get_float_exception_flags(&env->fp_status);
 329     update_fpu_flags(flags & float_flag_invalid);
 330
 331     return r;
 332 }
 333
 334 uint32_t helper_fcmp_eq(uint32_t a, uint32_t b)
 335 {
 336     CPU_FloatU fa, fb;
 337     int flags;
 338     int r;
 339
 340     set_float_exception_flags(0, &env->fp_status);
 341     fa.l = a;
 342     fb.l = b;
 343     r = float32_eq(fa.f, fb.f, &env->fp_status);
 344     flags = get_float_exception_flags(&env->fp_status);
 345     update_fpu_flags(flags & float_flag_invalid);
 346
 347     return r;
 348 }
 349
 350 uint32_t helper_fcmp_le(uint32_t a, uint32_t b)
 351 {
 352     CPU_FloatU fa, fb;
 353     int flags;
 354     int r;
 355
 356     fa.l = a;
 357     fb.l = b;
 358     set_float_exception_flags(0, &env->fp_status);
 359     r = float32_le(fa.f, fb.f, &env->fp_status);
 360     flags = get_float_exception_flags(&env->fp_status);
 361     update_fpu_flags(flags & float_flag_invalid);
 362
 363
 364     return r;
 365 }
 366
 367 uint32_t helper_fcmp_gt(uint32_t a, uint32_t b)
 368 {
 369     CPU_FloatU fa, fb;
 370     int flags, r;
 371
 372     fa.l = a;
 373     fb.l = b;
 374     set_float_exception_flags(0, &env->fp_status);
 375     r = float32_lt(fa.f, fb.f, &env->fp_status);
 376     flags = get_float_exception_flags(&env->fp_status);
 377     update_fpu_flags(flags & float_flag_invalid);
 378     return r;
 379 }
 380
 381 uint32_t helper_fcmp_ne(uint32_t a, uint32_t b)
 382 {
 383     CPU_FloatU fa, fb;
 384     int flags, r;
 385
 386     fa.l = a;
 387     fb.l = b;
 388     set_float_exception_flags(0, &env->fp_status);
 389     r = !float32_eq(fa.f, fb.f, &env->fp_status);
 390     flags = get_float_exception_flags(&env->fp_status);
 391     update_fpu_flags(flags & float_flag_invalid);
 392
 393     return r;
 394 }
 395
 396 uint32_t helper_fcmp_ge(uint32_t a, uint32_t b)
 397 {
 398     CPU_FloatU fa, fb;
 399     int flags, r;
 400
 401     fa.l = a;
 402     fb.l = b;
 403     set_float_exception_flags(0, &env->fp_status);
 404     r = !float32_lt(fa.f, fb.f, &env->fp_status);
 405     flags = get_float_exception_flags(&env->fp_status);
 406     update_fpu_flags(flags & float_flag_invalid);
 407
 408     return r;
 409 }
 410
 411 uint32_t helper_flt(uint32_t a)
 412 {
 413     CPU_FloatU fd, fa;
 414
 415     fa.l = a;
 416     fd.f = int32_to_float32(fa.l, &env->fp_status);
 417     return fd.l;
 418 }
 419
 420 uint32_t helper_fint(uint32_t a)
 421 {
 422     CPU_FloatU fa;
 423     uint32_t r;
 424     int flags;
 425
 426     set_float_exception_flags(0, &env->fp_status);
 427     fa.l = a;
 428     r = float32_to_int32(fa.f, &env->fp_status);
 429     flags = get_float_exception_flags(&env->fp_status);
 430     update_fpu_flags(flags);
 431
 432     return r;
 433 }
 434
 435 uint32_t helper_fsqrt(uint32_t a)
 436 {
 437     CPU_FloatU fd, fa;
 438     int flags;
 439
 440     set_float_exception_flags(0, &env->fp_status);
 441     fa.l = a;
 442     fd.l = float32_sqrt(fa.f, &env->fp_status);
 443     flags = get_float_exception_flags(&env->fp_status);
 444     update_fpu_flags(flags);
 445
 446     return fd.l;
 447 }
 448
 449 uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
 450 {
 451     unsigned int i;
 452     uint32_t mask = 0xff000000;
 453
 454     for (i = 0; i < 4; i++) {
 455         if ((a & mask) == (b & mask))
 456             return i + 1;
 457         mask >>= 8;
 458     }
 459     return 0;
 460 }
 461
 462 void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
 463 {
 464     if (addr & mask) {
 465             qemu_log_mask(CPU_LOG_INT,
 466                           "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
 467                           addr, mask, wr, dr);
 468             env->sregs[SR_EAR] = addr;
 469             env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \
 470                                  | (dr & 31) << 5;
 471             if (mask == 3) {
 472                 env->sregs[SR_ESR] |= 1 << 11;
 473             }
 474             if (!(env->sregs[SR_MSR] & MSR_EE)) {
 475                 return;
 476             }
 477             helper_raise_exception(EXCP_HW_EXCP);
 478     }
 479 }
 480
 481 #if !defined(CONFIG_USER_ONLY)
 482 /* Writes/reads to the MMU's special regs end up here.  */
 483 uint32_t helper_mmu_read(uint32_t rn)
 484 {
 485     return mmu_read(env, rn);
 486 }
 487
 488 void helper_mmu_write(uint32_t rn, uint32_t v)
 489 {
 490     mmu_write(env, rn, v);
 491 }
 492
 493 void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
 494                           int is_asi, int size)
 495 {
 496     CPUState *saved_env;
 497
 498     if (!cpu_single_env) {
 499         /* XXX: ???   */
 500         return;
 501     }
 502
 503     /* XXX: hack to restore env in all cases, even if not called from
 504        generated code */
 505     saved_env = env;
 506     env = cpu_single_env;
 507     qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
 508              addr, is_write, is_exec);
 509     if (!(env->sregs[SR_MSR] & MSR_EE)) {
 510         env = saved_env;
 511         return;
 512     }
 513
 514     env->sregs[SR_EAR] = addr;
 515     if (is_exec) {
 516         if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
 517             env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
 518             helper_raise_exception(EXCP_HW_EXCP);
 519         }
 520     } else {
 521         if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
 522             env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
 523             helper_raise_exception(EXCP_HW_EXCP);
 524         }
 525     }
 526     env = saved_env;
 527 }
 528 #endif