1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * LoongArch emulation for QEMU - main translation routines. 4 * 5 * Copyright (c) 2021 Loongson Technology Corporation Limited 6 */ 7 8 #include "qemu/osdep.h" 9 #include "cpu.h" 10 #include "tcg/tcg-op.h" 11 #include "tcg/tcg-op-gvec.h" 12 #include "exec/translation-block.h" 13 #include "exec/translator.h" 14 #include "exec/helper-proto.h" 15 #include "exec/helper-gen.h" 16 #include "exec/log.h" 17 #include "qemu/qemu-print.h" 18 #include "fpu/softfloat.h" 19 #include "translate.h" 20 #include "internals.h" 21 #include "vec.h" 22 23 /* Global register indices */ 24 TCGv cpu_gpr[32], cpu_pc; 25 static TCGv cpu_lladdr, cpu_llval; 26 27 #define HELPER_H "helper.h" 28 #include "exec/helper-info.c.inc" 29 #undef HELPER_H 30 31 #define DISAS_STOP DISAS_TARGET_0 32 #define DISAS_EXIT DISAS_TARGET_1 33 #define DISAS_EXIT_UPDATE DISAS_TARGET_2 34 35 static inline int vec_full_offset(int regno) 36 { 37 return offsetof(CPULoongArchState, fpr[regno]); 38 } 39 40 static inline int vec_reg_offset(int regno, int index, MemOp mop) 41 { 42 const uint8_t size = 1 << mop; 43 int offs = index * size; 44 45 if (HOST_BIG_ENDIAN && size < 8 ) { 46 offs ^= (8 - size); 47 } 48 49 return offs + vec_full_offset(regno); 50 } 51 52 static inline void get_vreg64(TCGv_i64 dest, int regno, int index) 53 { 54 tcg_gen_ld_i64(dest, tcg_env, 55 offsetof(CPULoongArchState, fpr[regno].vreg.D(index))); 56 } 57 58 static inline void set_vreg64(TCGv_i64 src, int regno, int index) 59 { 60 tcg_gen_st_i64(src, tcg_env, 61 offsetof(CPULoongArchState, fpr[regno].vreg.D(index))); 62 } 63 64 static inline int plus_1(DisasContext *ctx, int x) 65 { 66 return x + 1; 67 } 68 69 static inline int shl_1(DisasContext *ctx, int x) 70 { 71 return x << 1; 72 } 73 74 static inline int shl_2(DisasContext *ctx, int x) 75 { 76 return x << 2; 77 } 78 79 static inline int shl_3(DisasContext *ctx, int x) 80 { 81 return x << 3; 82 } 83 84 /* 85 * LoongArch the upper 32 bits are undefined ("can be any value"). 86 * QEMU chooses to nanbox, because it is most likely to show guest bugs early. 87 */ 88 static void gen_nanbox_s(TCGv_i64 out, TCGv_i64 in) 89 { 90 tcg_gen_ori_i64(out, in, MAKE_64BIT_MASK(32, 32)); 91 } 92 93 void generate_exception(DisasContext *ctx, int excp) 94 { 95 tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next); 96 gen_helper_raise_exception(tcg_env, tcg_constant_i32(excp)); 97 ctx->base.is_jmp = DISAS_NORETURN; 98 } 99 100 static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest) 101 { 102 if (ctx->va32) { 103 dest = (uint32_t) dest; 104 } 105 106 if (translator_use_goto_tb(&ctx->base, dest)) { 107 tcg_gen_goto_tb(n); 108 tcg_gen_movi_tl(cpu_pc, dest); 109 tcg_gen_exit_tb(ctx->base.tb, n); 110 } else { 111 tcg_gen_movi_tl(cpu_pc, dest); 112 tcg_gen_lookup_and_goto_ptr(); 113 } 114 } 115 116 static void loongarch_tr_init_disas_context(DisasContextBase *dcbase, 117 CPUState *cs) 118 { 119 int64_t bound; 120 CPULoongArchState *env = cpu_env(cs); 121 DisasContext *ctx = container_of(dcbase, DisasContext, base); 122 123 ctx->page_start = ctx->base.pc_first & TARGET_PAGE_MASK; 124 ctx->plv = ctx->base.tb->flags & HW_FLAGS_PLV_MASK; 125 if (ctx->base.tb->flags & HW_FLAGS_CRMD_PG) { 126 ctx->mem_idx = ctx->plv; 127 } else { 128 ctx->mem_idx = MMU_DA_IDX; 129 } 130 131 /* Bound the number of insns to execute to those left on the page. */ 132 bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4; 133 ctx->base.max_insns = MIN(ctx->base.max_insns, bound); 134 135 if (FIELD_EX64(env->cpucfg[2], CPUCFG2, LSX)) { 136 ctx->vl = LSX_LEN; 137 } 138 139 if (FIELD_EX64(env->cpucfg[2], CPUCFG2, LASX)) { 140 ctx->vl = LASX_LEN; 141 } 142 143 ctx->la64 = is_la64(env); 144 ctx->va32 = (ctx->base.tb->flags & HW_FLAGS_VA32) != 0; 145 146 ctx->zero = tcg_constant_tl(0); 147 148 ctx->cpucfg1 = env->cpucfg[1]; 149 ctx->cpucfg2 = env->cpucfg[2]; 150 } 151 152 static void loongarch_tr_tb_start(DisasContextBase *dcbase, CPUState *cs) 153 { 154 } 155 156 static void loongarch_tr_insn_start(DisasContextBase *dcbase, CPUState *cs) 157 { 158 DisasContext *ctx = container_of(dcbase, DisasContext, base); 159 160 tcg_gen_insn_start(ctx->base.pc_next); 161 } 162 163 /* 164 * Wrappers for getting reg values. 165 * 166 * The $zero register does not have cpu_gpr[0] allocated -- we supply the 167 * constant zero as a source, and an uninitialized sink as destination. 168 * 169 * Further, we may provide an extension for word operations. 170 */ 171 static TCGv gpr_src(DisasContext *ctx, int reg_num, DisasExtend src_ext) 172 { 173 TCGv t; 174 175 if (reg_num == 0) { 176 return ctx->zero; 177 } 178 179 switch (src_ext) { 180 case EXT_NONE: 181 return cpu_gpr[reg_num]; 182 case EXT_SIGN: 183 t = tcg_temp_new(); 184 tcg_gen_ext32s_tl(t, cpu_gpr[reg_num]); 185 return t; 186 case EXT_ZERO: 187 t = tcg_temp_new(); 188 tcg_gen_ext32u_tl(t, cpu_gpr[reg_num]); 189 return t; 190 } 191 g_assert_not_reached(); 192 } 193 194 static TCGv gpr_dst(DisasContext *ctx, int reg_num, DisasExtend dst_ext) 195 { 196 if (reg_num == 0 || dst_ext) { 197 return tcg_temp_new(); 198 } 199 return cpu_gpr[reg_num]; 200 } 201 202 static void gen_set_gpr(int reg_num, TCGv t, DisasExtend dst_ext) 203 { 204 if (reg_num != 0) { 205 switch (dst_ext) { 206 case EXT_NONE: 207 tcg_gen_mov_tl(cpu_gpr[reg_num], t); 208 break; 209 case EXT_SIGN: 210 tcg_gen_ext32s_tl(cpu_gpr[reg_num], t); 211 break; 212 case EXT_ZERO: 213 tcg_gen_ext32u_tl(cpu_gpr[reg_num], t); 214 break; 215 default: 216 g_assert_not_reached(); 217 } 218 } 219 } 220 221 static TCGv get_fpr(DisasContext *ctx, int reg_num) 222 { 223 TCGv t = tcg_temp_new(); 224 tcg_gen_ld_i64(t, tcg_env, 225 offsetof(CPULoongArchState, fpr[reg_num].vreg.D(0))); 226 return t; 227 } 228 229 static void set_fpr(int reg_num, TCGv val) 230 { 231 tcg_gen_st_i64(val, tcg_env, 232 offsetof(CPULoongArchState, fpr[reg_num].vreg.D(0))); 233 } 234 235 static TCGv make_address_x(DisasContext *ctx, TCGv base, TCGv addend) 236 { 237 TCGv temp = NULL; 238 239 if (addend || ctx->va32) { 240 temp = tcg_temp_new(); 241 } 242 if (addend) { 243 tcg_gen_add_tl(temp, base, addend); 244 base = temp; 245 } 246 if (ctx->va32) { 247 tcg_gen_ext32u_tl(temp, base); 248 base = temp; 249 } 250 return base; 251 } 252 253 static TCGv make_address_i(DisasContext *ctx, TCGv base, target_long ofs) 254 { 255 TCGv addend = ofs ? tcg_constant_tl(ofs) : NULL; 256 return make_address_x(ctx, base, addend); 257 } 258 259 static uint64_t make_address_pc(DisasContext *ctx, uint64_t addr) 260 { 261 if (ctx->va32) { 262 addr = (int32_t)addr; 263 } 264 return addr; 265 } 266 267 #include "decode-insns.c.inc" 268 #include "insn_trans/trans_arith.c.inc" 269 #include "insn_trans/trans_shift.c.inc" 270 #include "insn_trans/trans_bit.c.inc" 271 #include "insn_trans/trans_memory.c.inc" 272 #include "insn_trans/trans_atomic.c.inc" 273 #include "insn_trans/trans_extra.c.inc" 274 #include "insn_trans/trans_farith.c.inc" 275 #include "insn_trans/trans_fcmp.c.inc" 276 #include "insn_trans/trans_fcnv.c.inc" 277 #include "insn_trans/trans_fmov.c.inc" 278 #include "insn_trans/trans_fmemory.c.inc" 279 #include "insn_trans/trans_branch.c.inc" 280 #include "insn_trans/trans_privileged.c.inc" 281 #include "insn_trans/trans_vec.c.inc" 282 283 static void loongarch_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs) 284 { 285 CPULoongArchState *env = cpu_env(cs); 286 DisasContext *ctx = container_of(dcbase, DisasContext, base); 287 288 ctx->opcode = translator_ldl(env, &ctx->base, ctx->base.pc_next); 289 290 if (!decode(ctx, ctx->opcode)) { 291 qemu_log_mask(LOG_UNIMP, "Error: unknown opcode. " 292 TARGET_FMT_lx ": 0x%x\n", 293 ctx->base.pc_next, ctx->opcode); 294 generate_exception(ctx, EXCCODE_INE); 295 } 296 297 ctx->base.pc_next += 4; 298 299 if (ctx->va32) { 300 ctx->base.pc_next = (uint32_t)ctx->base.pc_next; 301 } 302 } 303 304 static void loongarch_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs) 305 { 306 DisasContext *ctx = container_of(dcbase, DisasContext, base); 307 308 switch (ctx->base.is_jmp) { 309 case DISAS_STOP: 310 tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next); 311 tcg_gen_lookup_and_goto_ptr(); 312 break; 313 case DISAS_TOO_MANY: 314 gen_goto_tb(ctx, 0, ctx->base.pc_next); 315 break; 316 case DISAS_NORETURN: 317 break; 318 case DISAS_EXIT_UPDATE: 319 tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next); 320 QEMU_FALLTHROUGH; 321 case DISAS_EXIT: 322 tcg_gen_exit_tb(NULL, 0); 323 break; 324 default: 325 g_assert_not_reached(); 326 } 327 } 328 329 static void loongarch_tr_disas_log(const DisasContextBase *dcbase, 330 CPUState *cpu, FILE *logfile) 331 { 332 qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first)); 333 target_disas(logfile, cpu, dcbase->pc_first, dcbase->tb->size); 334 } 335 336 static const TranslatorOps loongarch_tr_ops = { 337 .init_disas_context = loongarch_tr_init_disas_context, 338 .tb_start = loongarch_tr_tb_start, 339 .insn_start = loongarch_tr_insn_start, 340 .translate_insn = loongarch_tr_translate_insn, 341 .tb_stop = loongarch_tr_tb_stop, 342 .disas_log = loongarch_tr_disas_log, 343 }; 344 345 void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int *max_insns, 346 vaddr pc, void *host_pc) 347 { 348 DisasContext ctx; 349 350 translator_loop(cs, tb, max_insns, pc, host_pc, 351 &loongarch_tr_ops, &ctx.base); 352 } 353 354 void loongarch_translate_init(void) 355 { 356 int i; 357 358 cpu_gpr[0] = NULL; 359 for (i = 1; i < 32; i++) { 360 cpu_gpr[i] = tcg_global_mem_new(tcg_env, 361 offsetof(CPULoongArchState, gpr[i]), 362 regnames[i]); 363 } 364 365 cpu_pc = tcg_global_mem_new(tcg_env, offsetof(CPULoongArchState, pc), "pc"); 366 cpu_lladdr = tcg_global_mem_new(tcg_env, 367 offsetof(CPULoongArchState, lladdr), "lladdr"); 368 cpu_llval = tcg_global_mem_new(tcg_env, 369 offsetof(CPULoongArchState, llval), "llval"); 370 } 371