target/hexagon/genptr.c

   1 /*
   2  *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "qemu/osdep.h"
  19 #include "qemu/log.h"
  20 #include "cpu.h"
  21 #include "internal.h"
  22 #include "tcg/tcg-op.h"
  23 #include "insn.h"
  24 #include "opcodes.h"
  25 #include "translate.h"
  26 #define QEMU_GENERATE       /* Used internally by macros.h */
  27 #include "macros.h"
  28 #undef QEMU_GENERATE
  29 #include "gen_tcg.h"
  30
  31 static inline TCGv gen_read_preg(TCGv pred, uint8_t num)
  32 {
  33     tcg_gen_mov_tl(pred, hex_pred[num]);
  34     return pred;
  35 }
  36
  37 static inline void gen_log_predicated_reg_write(int rnum, TCGv val, int slot)
  38 {
  39     TCGv zero = tcg_const_tl(0);
  40     TCGv slot_mask = tcg_temp_new();
  41
  42     tcg_gen_andi_tl(slot_mask, hex_slot_cancelled, 1 << slot);
  43     tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum], slot_mask, zero,
  44                            val, hex_new_value[rnum]);
  45     if (HEX_DEBUG) {
  46         /*
  47          * Do this so HELPER(debug_commit_end) will know
  48          *
  49          * Note that slot_mask indicates the value is not written
  50          * (i.e., slot was cancelled), so we create a true/false value before
  51          * or'ing with hex_reg_written[rnum].
  52          */
  53         tcg_gen_setcond_tl(TCG_COND_EQ, slot_mask, slot_mask, zero);
  54         tcg_gen_or_tl(hex_reg_written[rnum], hex_reg_written[rnum], slot_mask);
  55     }
  56
  57     tcg_temp_free(zero);
  58     tcg_temp_free(slot_mask);
  59 }
  60
  61 static inline void gen_log_reg_write(int rnum, TCGv val)
  62 {
  63     tcg_gen_mov_tl(hex_new_value[rnum], val);
  64     if (HEX_DEBUG) {
  65         /* Do this so HELPER(debug_commit_end) will know */
  66         tcg_gen_movi_tl(hex_reg_written[rnum], 1);
  67     }
  68 }
  69
  70 static void gen_log_predicated_reg_write_pair(int rnum, TCGv_i64 val, int slot)
  71 {
  72     TCGv val32 = tcg_temp_new();
  73     TCGv zero = tcg_const_tl(0);
  74     TCGv slot_mask = tcg_temp_new();
  75
  76     tcg_gen_andi_tl(slot_mask, hex_slot_cancelled, 1 << slot);
  77     /* Low word */
  78     tcg_gen_extrl_i64_i32(val32, val);
  79     tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum],
  80                        slot_mask, zero,
  81                        val32, hex_new_value[rnum]);
  82     /* High word */
  83     tcg_gen_extrh_i64_i32(val32, val);
  84     tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum + 1],
  85                        slot_mask, zero,
  86                        val32, hex_new_value[rnum + 1]);
  87     if (HEX_DEBUG) {
  88         /*
  89          * Do this so HELPER(debug_commit_end) will know
  90          *
  91          * Note that slot_mask indicates the value is not written
  92          * (i.e., slot was cancelled), so we create a true/false value before
  93          * or'ing with hex_reg_written[rnum].
  94          */
  95         tcg_gen_setcond_tl(TCG_COND_EQ, slot_mask, slot_mask, zero);
  96         tcg_gen_or_tl(hex_reg_written[rnum], hex_reg_written[rnum], slot_mask);
  97         tcg_gen_or_tl(hex_reg_written[rnum + 1], hex_reg_written[rnum + 1],
  98                       slot_mask);
  99     }
 100
 101     tcg_temp_free(val32);
 102     tcg_temp_free(zero);
 103     tcg_temp_free(slot_mask);
 104 }
 105
 106 static void gen_log_reg_write_pair(int rnum, TCGv_i64 val)
 107 {
 108     /* Low word */
 109     tcg_gen_extrl_i64_i32(hex_new_value[rnum], val);
 110     if (HEX_DEBUG) {
 111         /* Do this so HELPER(debug_commit_end) will know */
 112         tcg_gen_movi_tl(hex_reg_written[rnum], 1);
 113     }
 114
 115     /* High word */
 116     tcg_gen_extrh_i64_i32(hex_new_value[rnum + 1], val);
 117     if (HEX_DEBUG) {
 118         /* Do this so HELPER(debug_commit_end) will know */
 119         tcg_gen_movi_tl(hex_reg_written[rnum + 1], 1);
 120     }
 121 }
 122
 123 static inline void gen_log_pred_write(DisasContext *ctx, int pnum, TCGv val)
 124 {
 125     TCGv zero = tcg_const_tl(0);
 126     TCGv base_val = tcg_temp_new();
 127     TCGv and_val = tcg_temp_new();
 128     TCGv pred_written = tcg_temp_new();
 129
 130     tcg_gen_andi_tl(base_val, val, 0xff);
 131
 132     /*
 133      * Section 6.1.3 of the Hexagon V67 Programmer's Reference Manual
 134      *
 135      * Multiple writes to the same preg are and'ed together
 136      * If this is the first predicate write in the packet, do a
 137      * straight assignment.  Otherwise, do an and.
 138      */
 139     if (!test_bit(pnum, ctx->pregs_written)) {
 140         tcg_gen_mov_tl(hex_new_pred_value[pnum], base_val);
 141     } else {
 142         tcg_gen_and_tl(hex_new_pred_value[pnum],
 143                        hex_new_pred_value[pnum], base_val);
 144     }
 145     tcg_gen_ori_tl(hex_pred_written, hex_pred_written, 1 << pnum);
 146
 147     tcg_temp_free(zero);
 148     tcg_temp_free(base_val);
 149     tcg_temp_free(and_val);
 150     tcg_temp_free(pred_written);
 151 }
 152
 153 static inline void gen_read_p3_0(TCGv control_reg)
 154 {
 155     tcg_gen_movi_tl(control_reg, 0);
 156     for (int i = 0; i < NUM_PREGS; i++) {
 157         tcg_gen_deposit_tl(control_reg, control_reg, hex_pred[i], i * 8, 8);
 158     }
 159 }
 160
 161 /*
 162  * Certain control registers require special handling on read
 163  *     HEX_REG_P3_0          aliased to the predicate registers
 164  *                           -> concat the 4 predicate registers together
 165  *     HEX_REG_PC            actual value stored in DisasContext
 166  *                           -> assign from ctx->base.pc_next
 167  *     HEX_REG_QEMU_*_CNT    changes in current TB in DisasContext
 168  *                           -> add current TB changes to existing reg value
 169  */
 170 static inline void gen_read_ctrl_reg(DisasContext *ctx, const int reg_num,
 171                                      TCGv dest)
 172 {
 173     if (reg_num == HEX_REG_P3_0) {
 174         gen_read_p3_0(dest);
 175     } else if (reg_num == HEX_REG_PC) {
 176         tcg_gen_movi_tl(dest, ctx->base.pc_next);
 177     } else if (reg_num == HEX_REG_QEMU_PKT_CNT) {
 178         tcg_gen_addi_tl(dest, hex_gpr[HEX_REG_QEMU_PKT_CNT],
 179                         ctx->num_packets);
 180     } else if (reg_num == HEX_REG_QEMU_INSN_CNT) {
 181         tcg_gen_addi_tl(dest, hex_gpr[HEX_REG_QEMU_INSN_CNT],
 182                         ctx->num_insns);
 183     } else {
 184         tcg_gen_mov_tl(dest, hex_gpr[reg_num]);
 185     }
 186 }
 187
 188 static inline void gen_read_ctrl_reg_pair(DisasContext *ctx, const int reg_num,
 189                                           TCGv_i64 dest)
 190 {
 191     if (reg_num == HEX_REG_P3_0) {
 192         TCGv p3_0 = tcg_temp_new();
 193         gen_read_p3_0(p3_0);
 194         tcg_gen_concat_i32_i64(dest, p3_0, hex_gpr[reg_num + 1]);
 195         tcg_temp_free(p3_0);
 196     } else if (reg_num == HEX_REG_PC - 1) {
 197         TCGv pc = tcg_const_tl(ctx->base.pc_next);
 198         tcg_gen_concat_i32_i64(dest, hex_gpr[reg_num], pc);
 199         tcg_temp_free(pc);
 200     } else if (reg_num == HEX_REG_QEMU_PKT_CNT) {
 201         TCGv pkt_cnt = tcg_temp_new();
 202         TCGv insn_cnt = tcg_temp_new();
 203         tcg_gen_addi_tl(pkt_cnt, hex_gpr[HEX_REG_QEMU_PKT_CNT],
 204                         ctx->num_packets);
 205         tcg_gen_addi_tl(insn_cnt, hex_gpr[HEX_REG_QEMU_INSN_CNT],
 206                         ctx->num_insns);
 207         tcg_gen_concat_i32_i64(dest, pkt_cnt, insn_cnt);
 208         tcg_temp_free(pkt_cnt);
 209         tcg_temp_free(insn_cnt);
 210     } else {
 211         tcg_gen_concat_i32_i64(dest,
 212             hex_gpr[reg_num],
 213             hex_gpr[reg_num + 1]);
 214     }
 215 }
 216
 217 static inline void gen_write_p3_0(TCGv control_reg)
 218 {
 219     for (int i = 0; i < NUM_PREGS; i++) {
 220         tcg_gen_extract_tl(hex_pred[i], control_reg, i * 8, 8);
 221     }
 222 }
 223
 224 /*
 225  * Certain control registers require special handling on write
 226  *     HEX_REG_P3_0          aliased to the predicate registers
 227  *                           -> break the value across 4 predicate registers
 228  *     HEX_REG_QEMU_*_CNT    changes in current TB in DisasContext
 229  *                            -> clear the changes
 230  */
 231 static inline void gen_write_ctrl_reg(DisasContext *ctx, int reg_num,
 232                                       TCGv val)
 233 {
 234     if (reg_num == HEX_REG_P3_0) {
 235         gen_write_p3_0(val);
 236     } else {
 237         gen_log_reg_write(reg_num, val);
 238         ctx_log_reg_write(ctx, reg_num);
 239         if (reg_num == HEX_REG_QEMU_PKT_CNT) {
 240             ctx->num_packets = 0;
 241         }
 242         if (reg_num == HEX_REG_QEMU_INSN_CNT) {
 243             ctx->num_insns = 0;
 244         }
 245     }
 246 }
 247
 248 static inline void gen_write_ctrl_reg_pair(DisasContext *ctx, int reg_num,
 249                                            TCGv_i64 val)
 250 {
 251     if (reg_num == HEX_REG_P3_0) {
 252         TCGv val32 = tcg_temp_new();
 253         tcg_gen_extrl_i64_i32(val32, val);
 254         gen_write_p3_0(val32);
 255         tcg_gen_extrh_i64_i32(val32, val);
 256         gen_log_reg_write(reg_num + 1, val32);
 257         tcg_temp_free(val32);
 258         ctx_log_reg_write(ctx, reg_num + 1);
 259     } else {
 260         gen_log_reg_write_pair(reg_num, val);
 261         ctx_log_reg_write_pair(ctx, reg_num);
 262         if (reg_num == HEX_REG_QEMU_PKT_CNT) {
 263             ctx->num_packets = 0;
 264             ctx->num_insns = 0;
 265         }
 266     }
 267 }
 268
 269 static TCGv gen_get_byte_i64(TCGv result, int N, TCGv_i64 src, bool sign)
 270 {
 271     TCGv_i64 res64 = tcg_temp_new_i64();
 272     if (sign) {
 273         tcg_gen_sextract_i64(res64, src, N * 8, 8);
 274     } else {
 275         tcg_gen_extract_i64(res64, src, N * 8, 8);
 276     }
 277     tcg_gen_extrl_i64_i32(result, res64);
 278     tcg_temp_free_i64(res64);
 279
 280     return result;
 281 }
 282
 283 static void gen_set_byte_i64(int N, TCGv_i64 result, TCGv src)
 284 {
 285     TCGv_i64 src64 = tcg_temp_new_i64();
 286     tcg_gen_extu_i32_i64(src64, src);
 287     tcg_gen_deposit_i64(result, result, src64, N * 8, 8);
 288     tcg_temp_free_i64(src64);
 289 }
 290
 291 static inline void gen_load_locked4u(TCGv dest, TCGv vaddr, int mem_index)
 292 {
 293     tcg_gen_qemu_ld32u(dest, vaddr, mem_index);
 294     tcg_gen_mov_tl(hex_llsc_addr, vaddr);
 295     tcg_gen_mov_tl(hex_llsc_val, dest);
 296 }
 297
 298 static inline void gen_load_locked8u(TCGv_i64 dest, TCGv vaddr, int mem_index)
 299 {
 300     tcg_gen_qemu_ld64(dest, vaddr, mem_index);
 301     tcg_gen_mov_tl(hex_llsc_addr, vaddr);
 302     tcg_gen_mov_i64(hex_llsc_val_i64, dest);
 303 }
 304
 305 static inline void gen_store_conditional4(CPUHexagonState *env,
 306                                           DisasContext *ctx, int prednum,
 307                                           TCGv pred, TCGv vaddr, TCGv src)
 308 {
 309     TCGLabel *fail = gen_new_label();
 310     TCGLabel *done = gen_new_label();
 311     TCGv one, zero, tmp;
 312
 313     tcg_gen_brcond_tl(TCG_COND_NE, vaddr, hex_llsc_addr, fail);
 314
 315     one = tcg_const_tl(0xff);
 316     zero = tcg_const_tl(0);
 317     tmp = tcg_temp_new();
 318     tcg_gen_atomic_cmpxchg_tl(tmp, hex_llsc_addr, hex_llsc_val, src,
 319                               ctx->mem_idx, MO_32);
 320     tcg_gen_movcond_tl(TCG_COND_EQ, hex_pred[prednum], tmp, hex_llsc_val,
 321                        one, zero);
 322     tcg_temp_free(one);
 323     tcg_temp_free(zero);
 324     tcg_temp_free(tmp);
 325     tcg_gen_br(done);
 326
 327     gen_set_label(fail);
 328     tcg_gen_movi_tl(pred, 0);
 329
 330     gen_set_label(done);
 331     tcg_gen_movi_tl(hex_llsc_addr, ~0);
 332 }
 333
 334 static inline void gen_store_conditional8(CPUHexagonState *env,
 335                                           DisasContext *ctx, int prednum,
 336                                           TCGv pred, TCGv vaddr, TCGv_i64 src)
 337 {
 338     TCGLabel *fail = gen_new_label();
 339     TCGLabel *done = gen_new_label();
 340     TCGv_i64 one, zero, tmp;
 341
 342     tcg_gen_brcond_tl(TCG_COND_NE, vaddr, hex_llsc_addr, fail);
 343
 344     one = tcg_const_i64(0xff);
 345     zero = tcg_const_i64(0);
 346     tmp = tcg_temp_new_i64();
 347     tcg_gen_atomic_cmpxchg_i64(tmp, hex_llsc_addr, hex_llsc_val_i64, src,
 348                                ctx->mem_idx, MO_64);
 349     tcg_gen_movcond_i64(TCG_COND_EQ, tmp, tmp, hex_llsc_val_i64,
 350                         one, zero);
 351     tcg_gen_extrl_i64_i32(hex_pred[prednum], tmp);
 352     tcg_temp_free_i64(one);
 353     tcg_temp_free_i64(zero);
 354     tcg_temp_free_i64(tmp);
 355     tcg_gen_br(done);
 356
 357     gen_set_label(fail);
 358     tcg_gen_movi_tl(pred, 0);
 359
 360     gen_set_label(done);
 361     tcg_gen_movi_tl(hex_llsc_addr, ~0);
 362 }
 363
 364 static TCGv gen_8bitsof(TCGv result, TCGv value)
 365 {
 366     TCGv zero = tcg_const_tl(0);
 367     TCGv ones = tcg_const_tl(0xff);
 368     tcg_gen_movcond_tl(TCG_COND_NE, result, value, zero, ones, zero);
 369     tcg_temp_free(zero);
 370     tcg_temp_free(ones);
 371
 372     return result;
 373 }
 374
 375 #include "tcg_funcs_generated.c.inc"
 376 #include "tcg_func_table_generated.c.inc"