target/riscv/translate.c

   1 /*
   2  * RISC-V emulation for qemu: main translation routines.
   3  *
   4  * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2 or later, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "qemu/osdep.h"
  20 #include "qemu/log.h"
  21 #include "cpu.h"
  22 #include "tcg-op.h"
  23 #include "disas/disas.h"
  24 #include "exec/cpu_ldst.h"
  25 #include "exec/exec-all.h"
  26 #include "exec/helper-proto.h"
  27 #include "exec/helper-gen.h"
  28
  29 #include "exec/translator.h"
  30 #include "exec/log.h"
  31
  32 #include "instmap.h"
  33
  34 /* global register indices */
  35 static TCGv cpu_gpr[32], cpu_pc;
  36 static TCGv_i64 cpu_fpr[32]; /* assume F and D extensions */
  37 static TCGv load_res;
  38 static TCGv load_val;
  39
  40 #include "exec/gen-icount.h"
  41
  42 typedef struct DisasContext {
  43     DisasContextBase base;
  44     /* pc_succ_insn points to the instruction following base.pc_next */
  45     target_ulong pc_succ_insn;
  46     target_ulong priv_ver;
  47     uint32_t opcode;
  48     uint32_t mstatus_fs;
  49     uint32_t misa;
  50     uint32_t mem_idx;
  51     /* Remember the rounding mode encoded in the previous fp instruction,
  52        which we have already installed into env->fp_status.  Or -1 for
  53        no previous fp instruction.  Note that we exit the TB when writing
  54        to any system register, which includes CSR_FRM, so we do not have
  55        to reset this known value.  */
  56     int frm;
  57 } DisasContext;
  58
  59 #ifdef TARGET_RISCV64
  60 /* convert riscv funct3 to qemu memop for load/store */
  61 static const int tcg_memop_lookup[8] = {
  62     [0 ... 7] = -1,
  63     [0] = MO_SB,
  64     [1] = MO_TESW,
  65     [2] = MO_TESL,
  66     [4] = MO_UB,
  67     [5] = MO_TEUW,
  68 #ifdef TARGET_RISCV64
  69     [3] = MO_TEQ,
  70     [6] = MO_TEUL,
  71 #endif
  72 };
  73 #endif
  74
  75 #ifdef TARGET_RISCV64
  76 #define CASE_OP_32_64(X) case X: case glue(X, W)
  77 #else
  78 #define CASE_OP_32_64(X) case X
  79 #endif
  80
  81 static inline bool has_ext(DisasContext *ctx, uint32_t ext)
  82 {
  83     return ctx->misa & ext;
  84 }
  85
  86 static void generate_exception(DisasContext *ctx, int excp)
  87 {
  88     tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
  89     TCGv_i32 helper_tmp = tcg_const_i32(excp);
  90     gen_helper_raise_exception(cpu_env, helper_tmp);
  91     tcg_temp_free_i32(helper_tmp);
  92     ctx->base.is_jmp = DISAS_NORETURN;
  93 }
  94
  95 static void generate_exception_mbadaddr(DisasContext *ctx, int excp)
  96 {
  97     tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
  98     tcg_gen_st_tl(cpu_pc, cpu_env, offsetof(CPURISCVState, badaddr));
  99     TCGv_i32 helper_tmp = tcg_const_i32(excp);
 100     gen_helper_raise_exception(cpu_env, helper_tmp);
 101     tcg_temp_free_i32(helper_tmp);
 102     ctx->base.is_jmp = DISAS_NORETURN;
 103 }
 104
 105 static void gen_exception_debug(void)
 106 {
 107     TCGv_i32 helper_tmp = tcg_const_i32(EXCP_DEBUG);
 108     gen_helper_raise_exception(cpu_env, helper_tmp);
 109     tcg_temp_free_i32(helper_tmp);
 110 }
 111
 112 static void gen_exception_illegal(DisasContext *ctx)
 113 {
 114     generate_exception(ctx, RISCV_EXCP_ILLEGAL_INST);
 115 }
 116
 117 static void gen_exception_inst_addr_mis(DisasContext *ctx)
 118 {
 119     generate_exception_mbadaddr(ctx, RISCV_EXCP_INST_ADDR_MIS);
 120 }
 121
 122 static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
 123 {
 124     if (unlikely(ctx->base.singlestep_enabled)) {
 125         return false;
 126     }
 127
 128 #ifndef CONFIG_USER_ONLY
 129     return (ctx->base.tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK);
 130 #else
 131     return true;
 132 #endif
 133 }
 134
 135 static void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
 136 {
 137     if (use_goto_tb(ctx, dest)) {
 138         /* chaining is only allowed when the jump is to the same page */
 139         tcg_gen_goto_tb(n);
 140         tcg_gen_movi_tl(cpu_pc, dest);
 141         tcg_gen_exit_tb(ctx->base.tb, n);
 142     } else {
 143         tcg_gen_movi_tl(cpu_pc, dest);
 144         if (ctx->base.singlestep_enabled) {
 145             gen_exception_debug();
 146         } else {
 147             tcg_gen_lookup_and_goto_ptr();
 148         }
 149     }
 150 }
 151
 152 /* Wrapper for getting reg values - need to check of reg is zero since
 153  * cpu_gpr[0] is not actually allocated
 154  */
 155 static inline void gen_get_gpr(TCGv t, int reg_num)
 156 {
 157     if (reg_num == 0) {
 158         tcg_gen_movi_tl(t, 0);
 159     } else {
 160         tcg_gen_mov_tl(t, cpu_gpr[reg_num]);
 161     }
 162 }
 163
 164 /* Wrapper for setting reg values - need to check of reg is zero since
 165  * cpu_gpr[0] is not actually allocated. this is more for safety purposes,
 166  * since we usually avoid calling the OP_TYPE_gen function if we see a write to
 167  * $zero
 168  */
 169 static inline void gen_set_gpr(int reg_num_dst, TCGv t)
 170 {
 171     if (reg_num_dst != 0) {
 172         tcg_gen_mov_tl(cpu_gpr[reg_num_dst], t);
 173     }
 174 }
 175
 176 static void gen_mulhsu(TCGv ret, TCGv arg1, TCGv arg2)
 177 {
 178     TCGv rl = tcg_temp_new();
 179     TCGv rh = tcg_temp_new();
 180
 181     tcg_gen_mulu2_tl(rl, rh, arg1, arg2);
 182     /* fix up for one negative */
 183     tcg_gen_sari_tl(rl, arg1, TARGET_LONG_BITS - 1);
 184     tcg_gen_and_tl(rl, rl, arg2);
 185     tcg_gen_sub_tl(ret, rh, rl);
 186
 187     tcg_temp_free(rl);
 188     tcg_temp_free(rh);
 189 }
 190
 191 static void gen_div(TCGv ret, TCGv source1, TCGv source2)
 192 {
 193     TCGv cond1, cond2, zeroreg, resultopt1;
 194     /*
 195      * Handle by altering args to tcg_gen_div to produce req'd results:
 196      * For overflow: want source1 in source1 and 1 in source2
 197      * For div by zero: want -1 in source1 and 1 in source2 -> -1 result
 198      */
 199     cond1 = tcg_temp_new();
 200     cond2 = tcg_temp_new();
 201     zeroreg = tcg_const_tl(0);
 202     resultopt1 = tcg_temp_new();
 203
 204     tcg_gen_movi_tl(resultopt1, (target_ulong)-1);
 205     tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, (target_ulong)(~0L));
 206     tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source1,
 207                         ((target_ulong)1) << (TARGET_LONG_BITS - 1));
 208     tcg_gen_and_tl(cond1, cond1, cond2); /* cond1 = overflow */
 209     tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, 0); /* cond2 = div 0 */
 210     /* if div by zero, set source1 to -1, otherwise don't change */
 211     tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond2, zeroreg, source1,
 212             resultopt1);
 213     /* if overflow or div by zero, set source2 to 1, else don't change */
 214     tcg_gen_or_tl(cond1, cond1, cond2);
 215     tcg_gen_movi_tl(resultopt1, (target_ulong)1);
 216     tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
 217             resultopt1);
 218     tcg_gen_div_tl(ret, source1, source2);
 219
 220     tcg_temp_free(cond1);
 221     tcg_temp_free(cond2);
 222     tcg_temp_free(zeroreg);
 223     tcg_temp_free(resultopt1);
 224 }
 225
 226 static void gen_divu(TCGv ret, TCGv source1, TCGv source2)
 227 {
 228     TCGv cond1, zeroreg, resultopt1;
 229     cond1 = tcg_temp_new();
 230
 231     zeroreg = tcg_const_tl(0);
 232     resultopt1 = tcg_temp_new();
 233
 234     tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0);
 235     tcg_gen_movi_tl(resultopt1, (target_ulong)-1);
 236     tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond1, zeroreg, source1,
 237             resultopt1);
 238     tcg_gen_movi_tl(resultopt1, (target_ulong)1);
 239     tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
 240             resultopt1);
 241     tcg_gen_divu_tl(ret, source1, source2);
 242
 243     tcg_temp_free(cond1);
 244     tcg_temp_free(zeroreg);
 245     tcg_temp_free(resultopt1);
 246 }
 247
 248 static void gen_rem(TCGv ret, TCGv source1, TCGv source2)
 249 {
 250     TCGv cond1, cond2, zeroreg, resultopt1;
 251
 252     cond1 = tcg_temp_new();
 253     cond2 = tcg_temp_new();
 254     zeroreg = tcg_const_tl(0);
 255     resultopt1 = tcg_temp_new();
 256
 257     tcg_gen_movi_tl(resultopt1, 1L);
 258     tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, (target_ulong)-1);
 259     tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source1,
 260                         (target_ulong)1 << (TARGET_LONG_BITS - 1));
 261     tcg_gen_and_tl(cond2, cond1, cond2); /* cond1 = overflow */
 262     tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0); /* cond2 = div 0 */
 263     /* if overflow or div by zero, set source2 to 1, else don't change */
 264     tcg_gen_or_tl(cond2, cond1, cond2);
 265     tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond2, zeroreg, source2,
 266             resultopt1);
 267     tcg_gen_rem_tl(resultopt1, source1, source2);
 268     /* if div by zero, just return the original dividend */
 269     tcg_gen_movcond_tl(TCG_COND_EQ, ret, cond1, zeroreg, resultopt1,
 270             source1);
 271
 272     tcg_temp_free(cond1);
 273     tcg_temp_free(cond2);
 274     tcg_temp_free(zeroreg);
 275     tcg_temp_free(resultopt1);
 276 }
 277
 278 static void gen_remu(TCGv ret, TCGv source1, TCGv source2)
 279 {
 280     TCGv cond1, zeroreg, resultopt1;
 281     cond1 = tcg_temp_new();
 282     zeroreg = tcg_const_tl(0);
 283     resultopt1 = tcg_temp_new();
 284
 285     tcg_gen_movi_tl(resultopt1, (target_ulong)1);
 286     tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0);
 287     tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
 288             resultopt1);
 289     tcg_gen_remu_tl(resultopt1, source1, source2);
 290     /* if div by zero, just return the original dividend */
 291     tcg_gen_movcond_tl(TCG_COND_EQ, ret, cond1, zeroreg, resultopt1,
 292             source1);
 293
 294     tcg_temp_free(cond1);
 295     tcg_temp_free(zeroreg);
 296     tcg_temp_free(resultopt1);
 297 }
 298
 299 static void gen_jal(DisasContext *ctx, int rd, target_ulong imm)
 300 {
 301     target_ulong next_pc;
 302
 303     /* check misaligned: */
 304     next_pc = ctx->base.pc_next + imm;
 305     if (!has_ext(ctx, RVC)) {
 306         if ((next_pc & 0x3) != 0) {
 307             gen_exception_inst_addr_mis(ctx);
 308             return;
 309         }
 310     }
 311     if (rd != 0) {
 312         tcg_gen_movi_tl(cpu_gpr[rd], ctx->pc_succ_insn);
 313     }
 314
 315     gen_goto_tb(ctx, 0, ctx->base.pc_next + imm); /* must use this for safety */
 316     ctx->base.is_jmp = DISAS_NORETURN;
 317 }
 318
 319 #ifdef TARGET_RISCV64
 320 static void gen_load_c(DisasContext *ctx, uint32_t opc, int rd, int rs1,
 321         target_long imm)
 322 {
 323     TCGv t0 = tcg_temp_new();
 324     TCGv t1 = tcg_temp_new();
 325     gen_get_gpr(t0, rs1);
 326     tcg_gen_addi_tl(t0, t0, imm);
 327     int memop = tcg_memop_lookup[(opc >> 12) & 0x7];
 328
 329     if (memop < 0) {
 330         gen_exception_illegal(ctx);
 331         return;
 332     }
 333
 334     tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, memop);
 335     gen_set_gpr(rd, t1);
 336     tcg_temp_free(t0);
 337     tcg_temp_free(t1);
 338 }
 339
 340 static void gen_store_c(DisasContext *ctx, uint32_t opc, int rs1, int rs2,
 341         target_long imm)
 342 {
 343     TCGv t0 = tcg_temp_new();
 344     TCGv dat = tcg_temp_new();
 345     gen_get_gpr(t0, rs1);
 346     tcg_gen_addi_tl(t0, t0, imm);
 347     gen_get_gpr(dat, rs2);
 348     int memop = tcg_memop_lookup[(opc >> 12) & 0x7];
 349
 350     if (memop < 0) {
 351         gen_exception_illegal(ctx);
 352         return;
 353     }
 354
 355     tcg_gen_qemu_st_tl(dat, t0, ctx->mem_idx, memop);
 356     tcg_temp_free(t0);
 357     tcg_temp_free(dat);
 358 }
 359 #endif
 360
 361 #ifndef CONFIG_USER_ONLY
 362 /* The states of mstatus_fs are:
 363  * 0 = disabled, 1 = initial, 2 = clean, 3 = dirty
 364  * We will have already diagnosed disabled state,
 365  * and need to turn initial/clean into dirty.
 366  */
 367 static void mark_fs_dirty(DisasContext *ctx)
 368 {
 369     TCGv tmp;
 370     if (ctx->mstatus_fs == MSTATUS_FS) {
 371         return;
 372     }
 373     /* Remember the state change for the rest of the TB.  */
 374     ctx->mstatus_fs = MSTATUS_FS;
 375
 376     tmp = tcg_temp_new();
 377     tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
 378     tcg_gen_ori_tl(tmp, tmp, MSTATUS_FS);
 379     tcg_gen_st_tl(tmp, cpu_env, offsetof(CPURISCVState, mstatus));
 380     tcg_temp_free(tmp);
 381 }
 382 #else
 383 static inline void mark_fs_dirty(DisasContext *ctx) { }
 384 #endif
 385
 386 #if !defined(TARGET_RISCV64)
 387 static void gen_fp_load(DisasContext *ctx, uint32_t opc, int rd,
 388         int rs1, target_long imm)
 389 {
 390     TCGv t0;
 391
 392     if (ctx->mstatus_fs == 0) {
 393         gen_exception_illegal(ctx);
 394         return;
 395     }
 396
 397     t0 = tcg_temp_new();
 398     gen_get_gpr(t0, rs1);
 399     tcg_gen_addi_tl(t0, t0, imm);
 400
 401     switch (opc) {
 402     case OPC_RISC_FLW:
 403         if (!has_ext(ctx, RVF)) {
 404             goto do_illegal;
 405         }
 406         tcg_gen_qemu_ld_i64(cpu_fpr[rd], t0, ctx->mem_idx, MO_TEUL);
 407         /* RISC-V requires NaN-boxing of narrower width floating point values */
 408         tcg_gen_ori_i64(cpu_fpr[rd], cpu_fpr[rd], 0xffffffff00000000ULL);
 409         break;
 410     case OPC_RISC_FLD:
 411         if (!has_ext(ctx, RVD)) {
 412             goto do_illegal;
 413         }
 414         tcg_gen_qemu_ld_i64(cpu_fpr[rd], t0, ctx->mem_idx, MO_TEQ);
 415         break;
 416     do_illegal:
 417     default:
 418         gen_exception_illegal(ctx);
 419         break;
 420     }
 421     tcg_temp_free(t0);
 422
 423     mark_fs_dirty(ctx);
 424 }
 425
 426 static void gen_fp_store(DisasContext *ctx, uint32_t opc, int rs1,
 427         int rs2, target_long imm)
 428 {
 429     TCGv t0;
 430
 431     if (ctx->mstatus_fs == 0) {
 432         gen_exception_illegal(ctx);
 433         return;
 434     }
 435
 436     t0 = tcg_temp_new();
 437     gen_get_gpr(t0, rs1);
 438     tcg_gen_addi_tl(t0, t0, imm);
 439
 440     switch (opc) {
 441     case OPC_RISC_FSW:
 442         if (!has_ext(ctx, RVF)) {
 443             goto do_illegal;
 444         }
 445         tcg_gen_qemu_st_i64(cpu_fpr[rs2], t0, ctx->mem_idx, MO_TEUL);
 446         break;
 447     case OPC_RISC_FSD:
 448         if (!has_ext(ctx, RVD)) {
 449             goto do_illegal;
 450         }
 451         tcg_gen_qemu_st_i64(cpu_fpr[rs2], t0, ctx->mem_idx, MO_TEQ);
 452         break;
 453     do_illegal:
 454     default:
 455         gen_exception_illegal(ctx);
 456         break;
 457     }
 458
 459     tcg_temp_free(t0);
 460 }
 461 #endif
 462
 463 static void gen_set_rm(DisasContext *ctx, int rm)
 464 {
 465     TCGv_i32 t0;
 466
 467     if (ctx->frm == rm) {
 468         return;
 469     }
 470     ctx->frm = rm;
 471     t0 = tcg_const_i32(rm);
 472     gen_helper_set_rounding_mode(cpu_env, t0);
 473     tcg_temp_free_i32(t0);
 474 }
 475
 476 static void decode_RV32_64C0(DisasContext *ctx)
 477 {
 478     uint8_t funct3 = extract32(ctx->opcode, 13, 3);
 479     uint8_t rd_rs2 = GET_C_RS2S(ctx->opcode);
 480     uint8_t rs1s = GET_C_RS1S(ctx->opcode);
 481
 482     switch (funct3) {
 483     case 3:
 484 #if defined(TARGET_RISCV64)
 485         /* C.LD(RV64/128) -> ld rd', offset[7:3](rs1')*/
 486         gen_load_c(ctx, OPC_RISC_LD, rd_rs2, rs1s,
 487                  GET_C_LD_IMM(ctx->opcode));
 488 #else
 489         /* C.FLW (RV32) -> flw rd', offset[6:2](rs1')*/
 490         gen_fp_load(ctx, OPC_RISC_FLW, rd_rs2, rs1s,
 491                     GET_C_LW_IMM(ctx->opcode));
 492 #endif
 493         break;
 494     case 7:
 495 #if defined(TARGET_RISCV64)
 496         /* C.SD (RV64/128) -> sd rs2', offset[7:3](rs1')*/
 497         gen_store_c(ctx, OPC_RISC_SD, rs1s, rd_rs2,
 498                   GET_C_LD_IMM(ctx->opcode));
 499 #else
 500         /* C.FSW (RV32) -> fsw rs2', offset[6:2](rs1')*/
 501         gen_fp_store(ctx, OPC_RISC_FSW, rs1s, rd_rs2,
 502                      GET_C_LW_IMM(ctx->opcode));
 503 #endif
 504         break;
 505     }
 506 }
 507
 508 static void decode_RV32_64C(DisasContext *ctx)
 509 {
 510     uint8_t op = extract32(ctx->opcode, 0, 2);
 511
 512     switch (op) {
 513     case 0:
 514         decode_RV32_64C0(ctx);
 515         break;
 516     }
 517 }
 518
 519 #define EX_SH(amount) \
 520     static int ex_shift_##amount(int imm) \
 521     {                                         \
 522         return imm << amount;                 \
 523     }
 524 EX_SH(1)
 525 EX_SH(2)
 526 EX_SH(3)
 527 EX_SH(4)
 528 EX_SH(12)
 529
 530 #define REQUIRE_EXT(ctx, ext) do { \
 531     if (!has_ext(ctx, ext)) {      \
 532         return false;              \
 533     }                              \
 534 } while (0)
 535
 536 static int ex_rvc_register(int reg)
 537 {
 538     return 8 + reg;
 539 }
 540
 541 bool decode_insn32(DisasContext *ctx, uint32_t insn);
 542 /* Include the auto-generated decoder for 32 bit insn */
 543 #include "decode_insn32.inc.c"
 544
 545 static bool gen_arith_imm(DisasContext *ctx, arg_i *a,
 546                           void(*func)(TCGv, TCGv, TCGv))
 547 {
 548     TCGv source1, source2;
 549     source1 = tcg_temp_new();
 550     source2 = tcg_temp_new();
 551
 552     gen_get_gpr(source1, a->rs1);
 553     tcg_gen_movi_tl(source2, a->imm);
 554
 555     (*func)(source1, source1, source2);
 556
 557     gen_set_gpr(a->rd, source1);
 558     tcg_temp_free(source1);
 559     tcg_temp_free(source2);
 560     return true;
 561 }
 562
 563 #ifdef TARGET_RISCV64
 564 static void gen_addw(TCGv ret, TCGv arg1, TCGv arg2)
 565 {
 566     tcg_gen_add_tl(ret, arg1, arg2);
 567     tcg_gen_ext32s_tl(ret, ret);
 568 }
 569
 570 static void gen_subw(TCGv ret, TCGv arg1, TCGv arg2)
 571 {
 572     tcg_gen_sub_tl(ret, arg1, arg2);
 573     tcg_gen_ext32s_tl(ret, ret);
 574 }
 575
 576 static void gen_mulw(TCGv ret, TCGv arg1, TCGv arg2)
 577 {
 578     tcg_gen_mul_tl(ret, arg1, arg2);
 579     tcg_gen_ext32s_tl(ret, ret);
 580 }
 581
 582 static bool gen_arith_div_w(DisasContext *ctx, arg_r *a,
 583                             void(*func)(TCGv, TCGv, TCGv))
 584 {
 585     TCGv source1, source2;
 586     source1 = tcg_temp_new();
 587     source2 = tcg_temp_new();
 588
 589     gen_get_gpr(source1, a->rs1);
 590     gen_get_gpr(source2, a->rs2);
 591     tcg_gen_ext32s_tl(source1, source1);
 592     tcg_gen_ext32s_tl(source2, source2);
 593
 594     (*func)(source1, source1, source2);
 595
 596     tcg_gen_ext32s_tl(source1, source1);
 597     gen_set_gpr(a->rd, source1);
 598     tcg_temp_free(source1);
 599     tcg_temp_free(source2);
 600     return true;
 601 }
 602
 603 static bool gen_arith_div_uw(DisasContext *ctx, arg_r *a,
 604                             void(*func)(TCGv, TCGv, TCGv))
 605 {
 606     TCGv source1, source2;
 607     source1 = tcg_temp_new();
 608     source2 = tcg_temp_new();
 609
 610     gen_get_gpr(source1, a->rs1);
 611     gen_get_gpr(source2, a->rs2);
 612     tcg_gen_ext32u_tl(source1, source1);
 613     tcg_gen_ext32u_tl(source2, source2);
 614
 615     (*func)(source1, source1, source2);
 616
 617     tcg_gen_ext32s_tl(source1, source1);
 618     gen_set_gpr(a->rd, source1);
 619     tcg_temp_free(source1);
 620     tcg_temp_free(source2);
 621     return true;
 622 }
 623
 624 #endif
 625
 626 static bool gen_arith(DisasContext *ctx, arg_r *a,
 627                       void(*func)(TCGv, TCGv, TCGv))
 628 {
 629     TCGv source1, source2;
 630     source1 = tcg_temp_new();
 631     source2 = tcg_temp_new();
 632
 633     gen_get_gpr(source1, a->rs1);
 634     gen_get_gpr(source2, a->rs2);
 635
 636     (*func)(source1, source1, source2);
 637
 638     gen_set_gpr(a->rd, source1);
 639     tcg_temp_free(source1);
 640     tcg_temp_free(source2);
 641     return true;
 642 }
 643
 644 static bool gen_shift(DisasContext *ctx, arg_r *a,
 645                         void(*func)(TCGv, TCGv, TCGv))
 646 {
 647     TCGv source1 = tcg_temp_new();
 648     TCGv source2 = tcg_temp_new();
 649
 650     gen_get_gpr(source1, a->rs1);
 651     gen_get_gpr(source2, a->rs2);
 652
 653     tcg_gen_andi_tl(source2, source2, TARGET_LONG_BITS - 1);
 654     (*func)(source1, source1, source2);
 655
 656     gen_set_gpr(a->rd, source1);
 657     tcg_temp_free(source1);
 658     tcg_temp_free(source2);
 659     return true;
 660 }
 661
 662 /* Include insn module translation function */
 663 #include "insn_trans/trans_rvi.inc.c"
 664 #include "insn_trans/trans_rvm.inc.c"
 665 #include "insn_trans/trans_rva.inc.c"
 666 #include "insn_trans/trans_rvf.inc.c"
 667 #include "insn_trans/trans_rvd.inc.c"
 668 #include "insn_trans/trans_privileged.inc.c"
 669
 670 bool decode_insn16(DisasContext *ctx, uint16_t insn);
 671 /* auto-generated decoder*/
 672 #include "decode_insn16.inc.c"
 673 #include "insn_trans/trans_rvc.inc.c"
 674
 675 static void decode_opc(DisasContext *ctx)
 676 {
 677     /* check for compressed insn */
 678     if (extract32(ctx->opcode, 0, 2) != 3) {
 679         if (!has_ext(ctx, RVC)) {
 680             gen_exception_illegal(ctx);
 681         } else {
 682             ctx->pc_succ_insn = ctx->base.pc_next + 2;
 683             if (!decode_insn16(ctx, ctx->opcode)) {
 684                 /* fall back to old decoder */
 685                 decode_RV32_64C(ctx);
 686             }
 687         }
 688     } else {
 689         ctx->pc_succ_insn = ctx->base.pc_next + 4;
 690         if (!decode_insn32(ctx, ctx->opcode)) {
 691             gen_exception_illegal(ctx);
 692         }
 693     }
 694 }
 695
 696 static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 697 {
 698     DisasContext *ctx = container_of(dcbase, DisasContext, base);
 699     CPURISCVState *env = cs->env_ptr;
 700
 701     ctx->pc_succ_insn = ctx->base.pc_first;
 702     ctx->mem_idx = ctx->base.tb->flags & TB_FLAGS_MMU_MASK;
 703     ctx->mstatus_fs = ctx->base.tb->flags & TB_FLAGS_MSTATUS_FS;
 704     ctx->priv_ver = env->priv_ver;
 705     ctx->misa = env->misa;
 706     ctx->frm = -1;  /* unknown rounding mode */
 707 }
 708
 709 static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
 710 {
 711 }
 712
 713 static void riscv_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)
 714 {
 715     DisasContext *ctx = container_of(dcbase, DisasContext, base);
 716
 717     tcg_gen_insn_start(ctx->base.pc_next);
 718 }
 719
 720 static bool riscv_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cpu,
 721                                       const CPUBreakpoint *bp)
 722 {
 723     DisasContext *ctx = container_of(dcbase, DisasContext, base);
 724
 725     tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
 726     ctx->base.is_jmp = DISAS_NORETURN;
 727     gen_exception_debug();
 728     /* The address covered by the breakpoint must be included in
 729        [tb->pc, tb->pc + tb->size) in order to for it to be
 730        properly cleared -- thus we increment the PC here so that
 731        the logic setting tb->size below does the right thing.  */
 732     ctx->base.pc_next += 4;
 733     return true;
 734 }
 735
 736 static void riscv_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
 737 {
 738     DisasContext *ctx = container_of(dcbase, DisasContext, base);
 739     CPURISCVState *env = cpu->env_ptr;
 740
 741     ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next);
 742     decode_opc(ctx);
 743     ctx->base.pc_next = ctx->pc_succ_insn;
 744
 745     if (ctx->base.is_jmp == DISAS_NEXT) {
 746         target_ulong page_start;
 747
 748         page_start = ctx->base.pc_first & TARGET_PAGE_MASK;
 749         if (ctx->base.pc_next - page_start >= TARGET_PAGE_SIZE) {
 750             ctx->base.is_jmp = DISAS_TOO_MANY;
 751         }
 752     }
 753 }
 754
 755 static void riscv_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
 756 {
 757     DisasContext *ctx = container_of(dcbase, DisasContext, base);
 758
 759     switch (ctx->base.is_jmp) {
 760     case DISAS_TOO_MANY:
 761         gen_goto_tb(ctx, 0, ctx->base.pc_next);
 762         break;
 763     case DISAS_NORETURN:
 764         break;
 765     default:
 766         g_assert_not_reached();
 767     }
 768 }
 769
 770 static void riscv_tr_disas_log(const DisasContextBase *dcbase, CPUState *cpu)
 771 {
 772     qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first));
 773     log_target_disas(cpu, dcbase->pc_first, dcbase->tb->size);
 774 }
 775
 776 static const TranslatorOps riscv_tr_ops = {
 777     .init_disas_context = riscv_tr_init_disas_context,
 778     .tb_start           = riscv_tr_tb_start,
 779     .insn_start         = riscv_tr_insn_start,
 780     .breakpoint_check   = riscv_tr_breakpoint_check,
 781     .translate_insn     = riscv_tr_translate_insn,
 782     .tb_stop            = riscv_tr_tb_stop,
 783     .disas_log          = riscv_tr_disas_log,
 784 };
 785
 786 void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
 787 {
 788     DisasContext ctx;
 789
 790     translator_loop(&riscv_tr_ops, &ctx.base, cs, tb);
 791 }
 792
 793 void riscv_translate_init(void)
 794 {
 795     int i;
 796
 797     /* cpu_gpr[0] is a placeholder for the zero register. Do not use it. */
 798     /* Use the gen_set_gpr and gen_get_gpr helper functions when accessing */
 799     /* registers, unless you specifically block reads/writes to reg 0 */
 800     cpu_gpr[0] = NULL;
 801
 802     for (i = 1; i < 32; i++) {
 803         cpu_gpr[i] = tcg_global_mem_new(cpu_env,
 804             offsetof(CPURISCVState, gpr[i]), riscv_int_regnames[i]);
 805     }
 806
 807     for (i = 0; i < 32; i++) {
 808         cpu_fpr[i] = tcg_global_mem_new_i64(cpu_env,
 809             offsetof(CPURISCVState, fpr[i]), riscv_fpr_regnames[i]);
 810     }
 811
 812     cpu_pc = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, pc), "pc");
 813     load_res = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, load_res),
 814                              "load_res");
 815     load_val = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, load_val),
 816                              "load_val");
 817 }