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);
  64             }
  65         }
  66         cpu_loop_exit();
  67     }
  68     env = saved_env;
  69 }
  70 #endif
  71
  72 void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
  73 {
  74     int test = ctrl & STREAM_TEST;
  75     int atomic = ctrl & STREAM_ATOMIC;
  76     int control = ctrl & STREAM_CONTROL;
  77     int nonblock = ctrl & STREAM_NONBLOCK;
  78     int exception = ctrl & STREAM_EXCEPTION;
  79
  80     qemu_log("Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
  81              id, data,
  82              test ? "t" : "",
  83              nonblock ? "n" : "",
  84              exception ? "e" : "",
  85              control ? "c" : "",
  86              atomic ? "a" : "");
  87 }
  88
  89 uint32_t helper_get(uint32_t id, uint32_t ctrl)
  90 {
  91     int test = ctrl & STREAM_TEST;
  92     int atomic = ctrl & STREAM_ATOMIC;
  93     int control = ctrl & STREAM_CONTROL;
  94     int nonblock = ctrl & STREAM_NONBLOCK;
  95     int exception = ctrl & STREAM_EXCEPTION;
  96
  97     qemu_log("Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
  98              id,
  99              test ? "t" : "",
 100              nonblock ? "n" : "",
 101              exception ? "e" : "",
 102              control ? "c" : "",
 103              atomic ? "a" : "");
 104     return 0xdead0000 | id;
 105 }
 106
 107 void helper_raise_exception(uint32_t index)
 108 {
 109     env->exception_index = index;
 110     cpu_loop_exit();
 111 }
 112
 113 void helper_debug(void)
 114 {
 115     int i;
 116
 117     qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
 118     qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
 119              env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
 120              env->debug, env->imm, env->iflags);
 121     qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
 122              env->btaken, env->btarget,
 123              (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
 124              (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
 125              (env->sregs[SR_MSR] & MSR_EIP),
 126              (env->sregs[SR_MSR] & MSR_IE));
 127     for (i = 0; i < 32; i++) {
 128         qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
 129         if ((i + 1) % 4 == 0)
 130             qemu_log("\n");
 131     }
 132     qemu_log("\n\n");
 133 }
 134
 135 static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
 136 {
 137     uint32_t cout = 0;
 138
 139     if ((b == ~0) && cin)
 140         cout = 1;
 141     else if ((~0 - a) < (b + cin))
 142         cout = 1;
 143     return cout;
 144 }
 145
 146 uint32_t helper_cmp(uint32_t a, uint32_t b)
 147 {
 148     uint32_t t;
 149
 150     t = b + ~a + 1;
 151     if ((b & 0x80000000) ^ (a & 0x80000000))
 152         t = (t & 0x7fffffff) | (b & 0x80000000);
 153     return t;
 154 }
 155
 156 uint32_t helper_cmpu(uint32_t a, uint32_t b)
 157 {
 158     uint32_t t;
 159
 160     t = b + ~a + 1;
 161     if ((b & 0x80000000) ^ (a & 0x80000000))
 162         t = (t & 0x7fffffff) | (a & 0x80000000);
 163     return t;
 164 }
 165
 166 uint32_t helper_carry(uint32_t a, uint32_t b, uint32_t cf)
 167 {
 168     uint32_t ncf;
 169     ncf = compute_carry(a, b, cf);
 170     return ncf;
 171 }
 172
 173 static inline int div_prepare(uint32_t a, uint32_t b)
 174 {
 175     if (b == 0) {
 176         env->sregs[SR_MSR] |= MSR_DZ;
 177
 178         if ((env->sregs[SR_MSR] & MSR_EE)
 179             && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
 180             env->sregs[SR_ESR] = ESR_EC_DIVZERO;
 181             helper_raise_exception(EXCP_HW_EXCP);
 182         }
 183         return 0;
 184     }
 185     env->sregs[SR_MSR] &= ~MSR_DZ;
 186     return 1;
 187 }
 188
 189 uint32_t helper_divs(uint32_t a, uint32_t b)
 190 {
 191     if (!div_prepare(a, b))
 192         return 0;
 193     return (int32_t)a / (int32_t)b;
 194 }
 195
 196 uint32_t helper_divu(uint32_t a, uint32_t b)
 197 {
 198     if (!div_prepare(a, b))
 199         return 0;
 200     return a / b;
 201 }
 202
 203 /* raise FPU exception.  */
 204 static void raise_fpu_exception(void)
 205 {
 206     env->sregs[SR_ESR] = ESR_EC_FPU;
 207     helper_raise_exception(EXCP_HW_EXCP);
 208 }
 209
 210 static void update_fpu_flags(int flags)
 211 {
 212     int raise = 0;
 213
 214     if (flags & float_flag_invalid) {
 215         env->sregs[SR_FSR] |= FSR_IO;
 216         raise = 1;
 217     }
 218     if (flags & float_flag_divbyzero) {
 219         env->sregs[SR_FSR] |= FSR_DZ;
 220         raise = 1;
 221     }
 222     if (flags & float_flag_overflow) {
 223         env->sregs[SR_FSR] |= FSR_OF;
 224         raise = 1;
 225     }
 226     if (flags & float_flag_underflow) {
 227         env->sregs[SR_FSR] |= FSR_UF;
 228         raise = 1;
 229     }
 230     if (raise
 231         && (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
 232         && (env->sregs[SR_MSR] & MSR_EE)) {
 233         raise_fpu_exception();
 234     }
 235 }
 236
 237 uint32_t helper_fadd(uint32_t a, uint32_t b)
 238 {
 239     CPU_FloatU fd, fa, fb;
 240     int flags;
 241
 242     set_float_exception_flags(0, &env->fp_status);
 243     fa.l = a;
 244     fb.l = b;
 245     fd.f = float32_add(fa.f, fb.f, &env->fp_status);
 246
 247     flags = get_float_exception_flags(&env->fp_status);
 248     update_fpu_flags(flags);
 249     return fd.l;
 250 }
 251
 252 uint32_t helper_frsub(uint32_t a, uint32_t b)
 253 {
 254     CPU_FloatU fd, fa, fb;
 255     int flags;
 256
 257     set_float_exception_flags(0, &env->fp_status);
 258     fa.l = a;
 259     fb.l = b;
 260     fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
 261     flags = get_float_exception_flags(&env->fp_status);
 262     update_fpu_flags(flags);
 263     return fd.l;
 264 }
 265
 266 uint32_t helper_fmul(uint32_t a, uint32_t b)
 267 {
 268     CPU_FloatU fd, fa, fb;
 269     int flags;
 270
 271     set_float_exception_flags(0, &env->fp_status);
 272     fa.l = a;
 273     fb.l = b;
 274     fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
 275     flags = get_float_exception_flags(&env->fp_status);
 276     update_fpu_flags(flags);
 277
 278     return fd.l;
 279 }
 280
 281 uint32_t helper_fdiv(uint32_t a, uint32_t b)
 282 {
 283     CPU_FloatU fd, fa, fb;
 284     int flags;
 285
 286     set_float_exception_flags(0, &env->fp_status);
 287     fa.l = a;
 288     fb.l = b;
 289     fd.f = float32_div(fb.f, fa.f, &env->fp_status);
 290     flags = get_float_exception_flags(&env->fp_status);
 291     update_fpu_flags(flags);
 292
 293     return fd.l;
 294 }
 295
 296 uint32_t helper_fcmp_un(uint32_t a, uint32_t b)
 297 {
 298     CPU_FloatU fa, fb;
 299     uint32_t r = 0;
 300
 301     fa.l = a;
 302     fb.l = b;
 303
 304     if (float32_is_signaling_nan(fa.f) || float32_is_signaling_nan(fb.f)) {
 305         update_fpu_flags(float_flag_invalid);
 306         r = 1;
 307     }
 308
 309     if (float32_is_quiet_nan(fa.f) || float32_is_quiet_nan(fb.f)) {
 310         r = 1;
 311     }
 312
 313     return r;
 314 }
 315
 316 uint32_t helper_fcmp_lt(uint32_t a, uint32_t b)
 317 {
 318     CPU_FloatU fa, fb;
 319     int r;
 320     int flags;
 321
 322     set_float_exception_flags(0, &env->fp_status);
 323     fa.l = a;
 324     fb.l = b;
 325     r = float32_lt(fb.f, fa.f, &env->fp_status);
 326     flags = get_float_exception_flags(&env->fp_status);
 327     update_fpu_flags(flags & float_flag_invalid);
 328
 329     return r;
 330 }
 331
 332 uint32_t helper_fcmp_eq(uint32_t a, uint32_t b)
 333 {
 334     CPU_FloatU fa, fb;
 335     int flags;
 336     int r;
 337
 338     set_float_exception_flags(0, &env->fp_status);
 339     fa.l = a;
 340     fb.l = b;
 341     r = float32_eq_quiet(fa.f, fb.f, &env->fp_status);
 342     flags = get_float_exception_flags(&env->fp_status);
 343     update_fpu_flags(flags & float_flag_invalid);
 344
 345     return r;
 346 }
 347
 348 uint32_t helper_fcmp_le(uint32_t a, uint32_t b)
 349 {
 350     CPU_FloatU fa, fb;
 351     int flags;
 352     int r;
 353
 354     fa.l = a;
 355     fb.l = b;
 356     set_float_exception_flags(0, &env->fp_status);
 357     r = float32_le(fa.f, fb.f, &env->fp_status);
 358     flags = get_float_exception_flags(&env->fp_status);
 359     update_fpu_flags(flags & float_flag_invalid);
 360
 361
 362     return r;
 363 }
 364
 365 uint32_t helper_fcmp_gt(uint32_t a, uint32_t b)
 366 {
 367     CPU_FloatU fa, fb;
 368     int flags, r;
 369
 370     fa.l = a;
 371     fb.l = b;
 372     set_float_exception_flags(0, &env->fp_status);
 373     r = float32_lt(fa.f, fb.f, &env->fp_status);
 374     flags = get_float_exception_flags(&env->fp_status);
 375     update_fpu_flags(flags & float_flag_invalid);
 376     return r;
 377 }
 378
 379 uint32_t helper_fcmp_ne(uint32_t a, uint32_t b)
 380 {
 381     CPU_FloatU fa, fb;
 382     int flags, r;
 383
 384     fa.l = a;
 385     fb.l = b;
 386     set_float_exception_flags(0, &env->fp_status);
 387     r = !float32_eq_quiet(fa.f, fb.f, &env->fp_status);
 388     flags = get_float_exception_flags(&env->fp_status);
 389     update_fpu_flags(flags & float_flag_invalid);
 390
 391     return r;
 392 }
 393
 394 uint32_t helper_fcmp_ge(uint32_t a, uint32_t b)
 395 {
 396     CPU_FloatU fa, fb;
 397     int flags, r;
 398
 399     fa.l = a;
 400     fb.l = b;
 401     set_float_exception_flags(0, &env->fp_status);
 402     r = !float32_lt(fa.f, fb.f, &env->fp_status);
 403     flags = get_float_exception_flags(&env->fp_status);
 404     update_fpu_flags(flags & float_flag_invalid);
 405
 406     return r;
 407 }
 408
 409 uint32_t helper_flt(uint32_t a)
 410 {
 411     CPU_FloatU fd, fa;
 412
 413     fa.l = a;
 414     fd.f = int32_to_float32(fa.l, &env->fp_status);
 415     return fd.l;
 416 }
 417
 418 uint32_t helper_fint(uint32_t a)
 419 {
 420     CPU_FloatU fa;
 421     uint32_t r;
 422     int flags;
 423
 424     set_float_exception_flags(0, &env->fp_status);
 425     fa.l = a;
 426     r = float32_to_int32(fa.f, &env->fp_status);
 427     flags = get_float_exception_flags(&env->fp_status);
 428     update_fpu_flags(flags);
 429
 430     return r;
 431 }
 432
 433 uint32_t helper_fsqrt(uint32_t a)
 434 {
 435     CPU_FloatU fd, fa;
 436     int flags;
 437
 438     set_float_exception_flags(0, &env->fp_status);
 439     fa.l = a;
 440     fd.l = float32_sqrt(fa.f, &env->fp_status);
 441     flags = get_float_exception_flags(&env->fp_status);
 442     update_fpu_flags(flags);
 443
 444     return fd.l;
 445 }
 446
 447 uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
 448 {
 449     unsigned int i;
 450     uint32_t mask = 0xff000000;
 451
 452     for (i = 0; i < 4; i++) {
 453         if ((a & mask) == (b & mask))
 454             return i + 1;
 455         mask >>= 8;
 456     }
 457     return 0;
 458 }
 459
 460 void helper_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
 461 {
 462     if (addr & mask) {
 463             qemu_log_mask(CPU_LOG_INT,
 464                           "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
 465                           addr, mask, wr, dr);
 466             env->sregs[SR_EAR] = addr;
 467             env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \
 468                                  | (dr & 31) << 5;
 469             if (mask == 3) {
 470                 env->sregs[SR_ESR] |= 1 << 11;
 471             }
 472             if (!(env->sregs[SR_MSR] & MSR_EE)) {
 473                 return;
 474             }
 475             helper_raise_exception(EXCP_HW_EXCP);
 476     }
 477 }
 478
 479 #if !defined(CONFIG_USER_ONLY)
 480 /* Writes/reads to the MMU's special regs end up here.  */
 481 uint32_t helper_mmu_read(uint32_t rn)
 482 {
 483     return mmu_read(env, rn);
 484 }
 485
 486 void helper_mmu_write(uint32_t rn, uint32_t v)
 487 {
 488     mmu_write(env, rn, v);
 489 }
 490
 491 void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
 492                           int is_asi, int size)
 493 {
 494     CPUState *saved_env;
 495
 496     if (!cpu_single_env) {
 497         /* XXX: ???   */
 498         return;
 499     }
 500
 501     /* XXX: hack to restore env in all cases, even if not called from
 502        generated code */
 503     saved_env = env;
 504     env = cpu_single_env;
 505     qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
 506              addr, is_write, is_exec);
 507     if (!(env->sregs[SR_MSR] & MSR_EE)) {
 508         env = saved_env;
 509         return;
 510     }
 511
 512     env->sregs[SR_EAR] = addr;
 513     if (is_exec) {
 514         if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
 515             env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
 516             helper_raise_exception(EXCP_HW_EXCP);
 517         }
 518     } else {
 519         if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
 520             env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
 521             helper_raise_exception(EXCP_HW_EXCP);
 522         }
 523     }
 524     env = saved_env;
 525 }
 526 #endif