target/ppc/mem_helper.c

   1 /*
   2  *  PowerPC memory access emulation helpers for QEMU.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   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 #include "qemu/osdep.h"
  20 #include "cpu.h"
  21 #include "exec/exec-all.h"
  22 #include "qemu/host-utils.h"
  23 #include "exec/helper-proto.h"
  24 #include "helper_regs.h"
  25 #include "exec/cpu_ldst.h"
  26 #include "tcg.h"
  27 #include "internal.h"
  28 #include "qemu/atomic128.h"
  29
  30 /* #define DEBUG_OP */
  31
  32 static inline bool needs_byteswap(const CPUPPCState *env)
  33 {
  34 #if defined(TARGET_WORDS_BIGENDIAN)
  35   return msr_le;
  36 #else
  37   return !msr_le;
  38 #endif
  39 }
  40
  41 /*****************************************************************************/
  42 /* Memory load and stores */
  43
  44 static inline target_ulong addr_add(CPUPPCState *env, target_ulong addr,
  45                                     target_long arg)
  46 {
  47 #if defined(TARGET_PPC64)
  48     if (!msr_is_64bit(env, env->msr)) {
  49         return (uint32_t)(addr + arg);
  50     } else
  51 #endif
  52     {
  53         return addr + arg;
  54     }
  55 }
  56
  57 void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
  58 {
  59     for (; reg < 32; reg++) {
  60         if (needs_byteswap(env)) {
  61             env->gpr[reg] = bswap32(cpu_ldl_data_ra(env, addr, GETPC()));
  62         } else {
  63             env->gpr[reg] = cpu_ldl_data_ra(env, addr, GETPC());
  64         }
  65         addr = addr_add(env, addr, 4);
  66     }
  67 }
  68
  69 void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
  70 {
  71     for (; reg < 32; reg++) {
  72         if (needs_byteswap(env)) {
  73             cpu_stl_data_ra(env, addr, bswap32((uint32_t)env->gpr[reg]),
  74                                                    GETPC());
  75         } else {
  76             cpu_stl_data_ra(env, addr, (uint32_t)env->gpr[reg], GETPC());
  77         }
  78         addr = addr_add(env, addr, 4);
  79     }
  80 }
  81
  82 static void do_lsw(CPUPPCState *env, target_ulong addr, uint32_t nb,
  83                    uint32_t reg, uintptr_t raddr)
  84 {
  85     int sh;
  86
  87     for (; nb > 3; nb -= 4) {
  88         env->gpr[reg] = cpu_ldl_data_ra(env, addr, raddr);
  89         reg = (reg + 1) % 32;
  90         addr = addr_add(env, addr, 4);
  91     }
  92     if (unlikely(nb > 0)) {
  93         env->gpr[reg] = 0;
  94         for (sh = 24; nb > 0; nb--, sh -= 8) {
  95             env->gpr[reg] |= cpu_ldub_data_ra(env, addr, raddr) << sh;
  96             addr = addr_add(env, addr, 1);
  97         }
  98     }
  99 }
 100
 101 void helper_lsw(CPUPPCState *env, target_ulong addr, uint32_t nb, uint32_t reg)
 102 {
 103     do_lsw(env, addr, nb, reg, GETPC());
 104 }
 105
 106 /*
 107  * PPC32 specification says we must generate an exception if rA is in
 108  * the range of registers to be loaded.  In an other hand, IBM says
 109  * this is valid, but rA won't be loaded.  For now, I'll follow the
 110  * spec...
 111  */
 112 void helper_lswx(CPUPPCState *env, target_ulong addr, uint32_t reg,
 113                  uint32_t ra, uint32_t rb)
 114 {
 115     if (likely(xer_bc != 0)) {
 116         int num_used_regs = DIV_ROUND_UP(xer_bc, 4);
 117         if (unlikely((ra != 0 && lsw_reg_in_range(reg, num_used_regs, ra)) ||
 118                      lsw_reg_in_range(reg, num_used_regs, rb))) {
 119             raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
 120                                    POWERPC_EXCP_INVAL |
 121                                    POWERPC_EXCP_INVAL_LSWX, GETPC());
 122         } else {
 123             do_lsw(env, addr, xer_bc, reg, GETPC());
 124         }
 125     }
 126 }
 127
 128 void helper_stsw(CPUPPCState *env, target_ulong addr, uint32_t nb,
 129                  uint32_t reg)
 130 {
 131     int sh;
 132
 133     for (; nb > 3; nb -= 4) {
 134         cpu_stl_data_ra(env, addr, env->gpr[reg], GETPC());
 135         reg = (reg + 1) % 32;
 136         addr = addr_add(env, addr, 4);
 137     }
 138     if (unlikely(nb > 0)) {
 139         for (sh = 24; nb > 0; nb--, sh -= 8) {
 140             cpu_stb_data_ra(env, addr, (env->gpr[reg] >> sh) & 0xFF, GETPC());
 141             addr = addr_add(env, addr, 1);
 142         }
 143     }
 144 }
 145
 146 static void dcbz_common(CPUPPCState *env, target_ulong addr,
 147                         uint32_t opcode, bool epid, uintptr_t retaddr)
 148 {
 149     target_ulong mask, dcbz_size = env->dcache_line_size;
 150     uint32_t i;
 151     void *haddr;
 152     int mmu_idx = epid ? PPC_TLB_EPID_STORE : env->dmmu_idx;
 153
 154 #if defined(TARGET_PPC64)
 155     /* Check for dcbz vs dcbzl on 970 */
 156     if (env->excp_model == POWERPC_EXCP_970 &&
 157         !(opcode & 0x00200000) && ((env->spr[SPR_970_HID5] >> 7) & 0x3) == 1) {
 158         dcbz_size = 32;
 159     }
 160 #endif
 161
 162     /* Align address */
 163     mask = ~(dcbz_size - 1);
 164     addr &= mask;
 165
 166     /* Check reservation */
 167     if ((env->reserve_addr & mask) == (addr & mask))  {
 168         env->reserve_addr = (target_ulong)-1ULL;
 169     }
 170
 171     /* Try fast path translate */
 172     haddr = tlb_vaddr_to_host(env, addr, MMU_DATA_STORE, mmu_idx);
 173     if (haddr) {
 174         memset(haddr, 0, dcbz_size);
 175     } else {
 176         /* Slow path */
 177         for (i = 0; i < dcbz_size; i += 8) {
 178             if (epid) {
 179 #if !defined(CONFIG_USER_ONLY)
 180                 /* Does not make sense on USER_ONLY config */
 181                 cpu_stq_eps_ra(env, addr + i, 0, retaddr);
 182 #endif
 183             } else {
 184                 cpu_stq_data_ra(env, addr + i, 0, retaddr);
 185             }
 186         }
 187     }
 188 }
 189
 190 void helper_dcbz(CPUPPCState *env, target_ulong addr, uint32_t opcode)
 191 {
 192     dcbz_common(env, addr, opcode, false, GETPC());
 193 }
 194
 195 void helper_dcbzep(CPUPPCState *env, target_ulong addr, uint32_t opcode)
 196 {
 197     dcbz_common(env, addr, opcode, true, GETPC());
 198 }
 199
 200 void helper_icbi(CPUPPCState *env, target_ulong addr)
 201 {
 202     addr &= ~(env->dcache_line_size - 1);
 203     /*
 204      * Invalidate one cache line :
 205      * PowerPC specification says this is to be treated like a load
 206      * (not a fetch) by the MMU. To be sure it will be so,
 207      * do the load "by hand".
 208      */
 209     cpu_ldl_data_ra(env, addr, GETPC());
 210 }
 211
 212 void helper_icbiep(CPUPPCState *env, target_ulong addr)
 213 {
 214 #if !defined(CONFIG_USER_ONLY)
 215     /* See comments above */
 216     addr &= ~(env->dcache_line_size - 1);
 217     cpu_ldl_epl_ra(env, addr, GETPC());
 218 #endif
 219 }
 220
 221 /* XXX: to be tested */
 222 target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
 223                           uint32_t ra, uint32_t rb)
 224 {
 225     int i, c, d;
 226
 227     d = 24;
 228     for (i = 0; i < xer_bc; i++) {
 229         c = cpu_ldub_data_ra(env, addr, GETPC());
 230         addr = addr_add(env, addr, 1);
 231         /* ra (if not 0) and rb are never modified */
 232         if (likely(reg != rb && (ra == 0 || reg != ra))) {
 233             env->gpr[reg] = (env->gpr[reg] & ~(0xFF << d)) | (c << d);
 234         }
 235         if (unlikely(c == xer_cmp)) {
 236             break;
 237         }
 238         if (likely(d != 0)) {
 239             d -= 8;
 240         } else {
 241             d = 24;
 242             reg++;
 243             reg = reg & 0x1F;
 244         }
 245     }
 246     return i;
 247 }
 248
 249 #ifdef TARGET_PPC64
 250 uint64_t helper_lq_le_parallel(CPUPPCState *env, target_ulong addr,
 251                                uint32_t opidx)
 252 {
 253     Int128 ret;
 254
 255     /* We will have raised EXCP_ATOMIC from the translator.  */
 256     assert(HAVE_ATOMIC128);
 257     ret = helper_atomic_ldo_le_mmu(env, addr, opidx, GETPC());
 258     env->retxh = int128_gethi(ret);
 259     return int128_getlo(ret);
 260 }
 261
 262 uint64_t helper_lq_be_parallel(CPUPPCState *env, target_ulong addr,
 263                                uint32_t opidx)
 264 {
 265     Int128 ret;
 266
 267     /* We will have raised EXCP_ATOMIC from the translator.  */
 268     assert(HAVE_ATOMIC128);
 269     ret = helper_atomic_ldo_be_mmu(env, addr, opidx, GETPC());
 270     env->retxh = int128_gethi(ret);
 271     return int128_getlo(ret);
 272 }
 273
 274 void helper_stq_le_parallel(CPUPPCState *env, target_ulong addr,
 275                             uint64_t lo, uint64_t hi, uint32_t opidx)
 276 {
 277     Int128 val;
 278
 279     /* We will have raised EXCP_ATOMIC from the translator.  */
 280     assert(HAVE_ATOMIC128);
 281     val = int128_make128(lo, hi);
 282     helper_atomic_sto_le_mmu(env, addr, val, opidx, GETPC());
 283 }
 284
 285 void helper_stq_be_parallel(CPUPPCState *env, target_ulong addr,
 286                             uint64_t lo, uint64_t hi, uint32_t opidx)
 287 {
 288     Int128 val;
 289
 290     /* We will have raised EXCP_ATOMIC from the translator.  */
 291     assert(HAVE_ATOMIC128);
 292     val = int128_make128(lo, hi);
 293     helper_atomic_sto_be_mmu(env, addr, val, opidx, GETPC());
 294 }
 295
 296 uint32_t helper_stqcx_le_parallel(CPUPPCState *env, target_ulong addr,
 297                                   uint64_t new_lo, uint64_t new_hi,
 298                                   uint32_t opidx)
 299 {
 300     bool success = false;
 301
 302     /* We will have raised EXCP_ATOMIC from the translator.  */
 303     assert(HAVE_CMPXCHG128);
 304
 305     if (likely(addr == env->reserve_addr)) {
 306         Int128 oldv, cmpv, newv;
 307
 308         cmpv = int128_make128(env->reserve_val2, env->reserve_val);
 309         newv = int128_make128(new_lo, new_hi);
 310         oldv = helper_atomic_cmpxchgo_le_mmu(env, addr, cmpv, newv,
 311                                              opidx, GETPC());
 312         success = int128_eq(oldv, cmpv);
 313     }
 314     env->reserve_addr = -1;
 315     return env->so + success * CRF_EQ_BIT;
 316 }
 317
 318 uint32_t helper_stqcx_be_parallel(CPUPPCState *env, target_ulong addr,
 319                                   uint64_t new_lo, uint64_t new_hi,
 320                                   uint32_t opidx)
 321 {
 322     bool success = false;
 323
 324     /* We will have raised EXCP_ATOMIC from the translator.  */
 325     assert(HAVE_CMPXCHG128);
 326
 327     if (likely(addr == env->reserve_addr)) {
 328         Int128 oldv, cmpv, newv;
 329
 330         cmpv = int128_make128(env->reserve_val2, env->reserve_val);
 331         newv = int128_make128(new_lo, new_hi);
 332         oldv = helper_atomic_cmpxchgo_be_mmu(env, addr, cmpv, newv,
 333                                              opidx, GETPC());
 334         success = int128_eq(oldv, cmpv);
 335     }
 336     env->reserve_addr = -1;
 337     return env->so + success * CRF_EQ_BIT;
 338 }
 339 #endif
 340
 341 /*****************************************************************************/
 342 /* Altivec extension helpers */
 343 #if defined(HOST_WORDS_BIGENDIAN)
 344 #define HI_IDX 0
 345 #define LO_IDX 1
 346 #else
 347 #define HI_IDX 1
 348 #define LO_IDX 0
 349 #endif
 350
 351 /*
 352  * We use msr_le to determine index ordering in a vector.  However,
 353  * byteswapping is not simply controlled by msr_le.  We also need to
 354  * take into account endianness of the target.  This is done for the
 355  * little-endian PPC64 user-mode target.
 356  */
 357
 358 #define LVE(name, access, swap, element)                        \
 359     void helper_##name(CPUPPCState *env, ppc_avr_t *r,          \
 360                        target_ulong addr)                       \
 361     {                                                           \
 362         size_t n_elems = ARRAY_SIZE(r->element);                \
 363         int adjust = HI_IDX * (n_elems - 1);                    \
 364         int sh = sizeof(r->element[0]) >> 1;                    \
 365         int index = (addr & 0xf) >> sh;                         \
 366         if (msr_le) {                                           \
 367             index = n_elems - index - 1;                        \
 368         }                                                       \
 369                                                                 \
 370         if (needs_byteswap(env)) {                              \
 371             r->element[LO_IDX ? index : (adjust - index)] =     \
 372                 swap(access(env, addr, GETPC()));               \
 373         } else {                                                \
 374             r->element[LO_IDX ? index : (adjust - index)] =     \
 375                 access(env, addr, GETPC());                     \
 376         }                                                       \
 377     }
 378 #define I(x) (x)
 379 LVE(lvebx, cpu_ldub_data_ra, I, u8)
 380 LVE(lvehx, cpu_lduw_data_ra, bswap16, u16)
 381 LVE(lvewx, cpu_ldl_data_ra, bswap32, u32)
 382 #undef I
 383 #undef LVE
 384
 385 #define STVE(name, access, swap, element)                               \
 386     void helper_##name(CPUPPCState *env, ppc_avr_t *r,                  \
 387                        target_ulong addr)                               \
 388     {                                                                   \
 389         size_t n_elems = ARRAY_SIZE(r->element);                        \
 390         int adjust = HI_IDX * (n_elems - 1);                            \
 391         int sh = sizeof(r->element[0]) >> 1;                            \
 392         int index = (addr & 0xf) >> sh;                                 \
 393         if (msr_le) {                                                   \
 394             index = n_elems - index - 1;                                \
 395         }                                                               \
 396                                                                         \
 397         if (needs_byteswap(env)) {                                      \
 398             access(env, addr, swap(r->element[LO_IDX ? index :          \
 399                                               (adjust - index)]),       \
 400                         GETPC());                                       \
 401         } else {                                                        \
 402             access(env, addr, r->element[LO_IDX ? index :               \
 403                                          (adjust - index)], GETPC());   \
 404         }                                                               \
 405     }
 406 #define I(x) (x)
 407 STVE(stvebx, cpu_stb_data_ra, I, u8)
 408 STVE(stvehx, cpu_stw_data_ra, bswap16, u16)
 409 STVE(stvewx, cpu_stl_data_ra, bswap32, u32)
 410 #undef I
 411 #undef LVE
 412
 413 #ifdef TARGET_PPC64
 414 #define GET_NB(rb) ((rb >> 56) & 0xFF)
 415
 416 #define VSX_LXVL(name, lj)                                              \
 417 void helper_##name(CPUPPCState *env, target_ulong addr,                 \
 418                    ppc_vsr_t *xt, target_ulong rb)                      \
 419 {                                                                       \
 420     ppc_vsr_t t;                                                        \
 421     uint64_t nb = GET_NB(rb);                                           \
 422     int i;                                                              \
 423                                                                         \
 424     t.s128 = int128_zero();                                             \
 425     if (nb) {                                                           \
 426         nb = (nb >= 16) ? 16 : nb;                                      \
 427         if (msr_le && !lj) {                                            \
 428             for (i = 16; i > 16 - nb; i--) {                            \
 429                 t.VsrB(i - 1) = cpu_ldub_data_ra(env, addr, GETPC());   \
 430                 addr = addr_add(env, addr, 1);                          \
 431             }                                                           \
 432         } else {                                                        \
 433             for (i = 0; i < nb; i++) {                                  \
 434                 t.VsrB(i) = cpu_ldub_data_ra(env, addr, GETPC());       \
 435                 addr = addr_add(env, addr, 1);                          \
 436             }                                                           \
 437         }                                                               \
 438     }                                                                   \
 439     *xt = t;                                                            \
 440 }
 441
 442 VSX_LXVL(lxvl, 0)
 443 VSX_LXVL(lxvll, 1)
 444 #undef VSX_LXVL
 445
 446 #define VSX_STXVL(name, lj)                                       \
 447 void helper_##name(CPUPPCState *env, target_ulong addr,           \
 448                    ppc_vsr_t *xt, target_ulong rb)                \
 449 {                                                                 \
 450     target_ulong nb = GET_NB(rb);                                 \
 451     int i;                                                        \
 452                                                                   \
 453     if (!nb) {                                                    \
 454         return;                                                   \
 455     }                                                             \
 456                                                                   \
 457     nb = (nb >= 16) ? 16 : nb;                                    \
 458     if (msr_le && !lj) {                                          \
 459         for (i = 16; i > 16 - nb; i--) {                          \
 460             cpu_stb_data_ra(env, addr, xt->VsrB(i - 1), GETPC()); \
 461             addr = addr_add(env, addr, 1);                        \
 462         }                                                         \
 463     } else {                                                      \
 464         for (i = 0; i < nb; i++) {                                \
 465             cpu_stb_data_ra(env, addr, xt->VsrB(i), GETPC());     \
 466             addr = addr_add(env, addr, 1);                        \
 467         }                                                         \
 468     }                                                             \
 469 }
 470
 471 VSX_STXVL(stxvl, 0)
 472 VSX_STXVL(stxvll, 1)
 473 #undef VSX_STXVL
 474 #undef GET_NB
 475 #endif /* TARGET_PPC64 */
 476
 477 #undef HI_IDX
 478 #undef LO_IDX
 479
 480 void helper_tbegin(CPUPPCState *env)
 481 {
 482     /*
 483      * As a degenerate implementation, always fail tbegin.  The reason
 484      * given is "Nesting overflow".  The "persistent" bit is set,
 485      * providing a hint to the error handler to not retry.  The TFIAR
 486      * captures the address of the failure, which is this tbegin
 487      * instruction.  Instruction execution will continue with the next
 488      * instruction in memory, which is precisely what we want.
 489      */
 490
 491     env->spr[SPR_TEXASR] =
 492         (1ULL << TEXASR_FAILURE_PERSISTENT) |
 493         (1ULL << TEXASR_NESTING_OVERFLOW) |
 494         (msr_hv << TEXASR_PRIVILEGE_HV) |
 495         (msr_pr << TEXASR_PRIVILEGE_PR) |
 496         (1ULL << TEXASR_FAILURE_SUMMARY) |
 497         (1ULL << TEXASR_TFIAR_EXACT);
 498     env->spr[SPR_TFIAR] = env->nip | (msr_hv << 1) | msr_pr;
 499     env->spr[SPR_TFHAR] = env->nip + 4;
 500     env->crf[0] = 0xB; /* 0b1010 = transaction failure */
 501 }