sim/or1k/or1k.c

   1 /* OpenRISC simulator support code
   2    Copyright (C) 2017-2024 Free Software Foundation, Inc.
   3
   4    This file is part of GDB, the GNU debugger.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* This must come before any other includes.  */
  20 #include "defs.h"
  21
  22 #define WANT_CPU_OR1K32BF
  23 #define WANT_CPU
  24
  25 #include "sim-main.h"
  26 #include "symcat.h"
  27 #include "cgen-ops.h"
  28 #include "cgen-mem.h"
  29 #include "cpuall.h"
  30
  31 #include <string.h>
  32
  33 int
  34 or1k32bf_fetch_register (sim_cpu *current_cpu, int rn, void *buf, int len)
  35 {
  36   if (rn < 32)
  37     SETTWI (buf, GET_H_GPR (rn));
  38   else
  39     switch (rn)
  40       {
  41       case PPC_REGNUM:
  42         SETTWI (buf, GET_H_SYS_PPC ());
  43         break;
  44       case PC_REGNUM:
  45         SETTWI (buf, GET_H_PC ());
  46         break;
  47       case SR_REGNUM:
  48         SETTWI (buf, GET_H_SYS_SR ());
  49         break;
  50       default:
  51         return 0;
  52       }
  53   return sizeof (WI);           /* WI from arch.h */
  54 }
  55
  56 int
  57 or1k32bf_store_register (sim_cpu *current_cpu, int rn, const void *buf, int len)
  58 {
  59   if (rn < 32)
  60     SET_H_GPR (rn, GETTWI (buf));
  61   else
  62     switch (rn)
  63       {
  64       case PPC_REGNUM:
  65         SET_H_SYS_PPC (GETTWI (buf));
  66         break;
  67       case PC_REGNUM:
  68         SET_H_PC (GETTWI (buf));
  69         break;
  70       case SR_REGNUM:
  71         SET_H_SYS_SR (GETTWI (buf));
  72         break;
  73       default:
  74         return 0;
  75       }
  76   return sizeof (WI);           /* WI from arch.h */
  77 }
  78
  79 int
  80 or1k32bf_model_or1200_u_exec (sim_cpu *current_cpu, const IDESC *idesc,
  81                               int unit_num, int referenced)
  82 {
  83   return -1;
  84 }
  85
  86 int
  87 or1k32bf_model_or1200nd_u_exec (sim_cpu *current_cpu, const IDESC *idesc,
  88                                 int unit_num, int referenced)
  89 {
  90   return -1;
  91 }
  92
  93 void
  94 or1k32bf_model_insn_before (sim_cpu *current_cpu, int first_p)
  95 {
  96 }
  97
  98 void
  99 or1k32bf_model_insn_after (sim_cpu *current_cpu, int last_p, int cycles)
 100 {
 101 }
 102
 103 USI
 104 or1k32bf_h_spr_get_raw (sim_cpu *current_cpu, USI addr)
 105 {
 106   SIM_DESC sd = CPU_STATE (current_cpu);
 107   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 108
 109   SIM_ASSERT (addr < NUM_SPR);
 110   return or1k_cpu->spr[addr];
 111 }
 112
 113 void
 114 or1k32bf_h_spr_set_raw (sim_cpu *current_cpu, USI addr, USI val)
 115 {
 116   SIM_DESC sd = CPU_STATE (current_cpu);
 117   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 118
 119   SIM_ASSERT (addr < NUM_SPR);
 120   or1k_cpu->spr[addr] = val;
 121 }
 122
 123 USI
 124 or1k32bf_h_spr_field_get_raw (sim_cpu *current_cpu, USI addr, int msb, int lsb)
 125 {
 126   SIM_DESC sd = CPU_STATE (current_cpu);
 127   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 128
 129   SIM_ASSERT (addr < NUM_SPR);
 130   return LSEXTRACTED (or1k_cpu->spr[addr], msb, lsb);
 131 }
 132
 133 void
 134 or1k32bf_h_spr_field_set_raw (sim_cpu *current_cpu, USI addr, int msb, int lsb,
 135                               USI val)
 136 {
 137   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 138
 139   or1k_cpu->spr[addr] &= ~LSMASK32 (msb, lsb);
 140   or1k_cpu->spr[addr] |= LSINSERTED (val, msb, lsb);
 141 }
 142
 143 /* Initialize a sim cpu object.  */
 144 void
 145 or1k_cpu_init (SIM_DESC sd, sim_cpu *current_cpu, const USI or1k_vr,
 146                const USI or1k_upr, const USI or1k_cpucfgr)
 147 {
 148   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 149
 150   /* Set the configuration registers passed from the user.  */
 151   SET_H_SYS_VR (or1k_vr);
 152   SET_H_SYS_UPR (or1k_upr);
 153   SET_H_SYS_CPUCFGR (or1k_cpucfgr);
 154
 155 #define CHECK_SPR_FIELD(GROUP, INDEX, FIELD, test) \
 156   do \
 157     { \
 158       USI field = GET_H_##SYS##_##INDEX##_##FIELD (); \
 159       if (!(test)) \
 160         sim_io_eprintf \
 161           (sd, "WARNING: unsupported %s field in %s register: 0x%x\n", \
 162            #FIELD, #INDEX, field); \
 163     } while (0)
 164
 165   /* Set flags indicating if we are in a delay slot or not.  */
 166   or1k_cpu->next_delay_slot = 0;
 167   or1k_cpu->delay_slot = 0;
 168
 169   /* Verify any user passed fields and warn on configurations we don't
 170      support.  */
 171   CHECK_SPR_FIELD (SYS, UPR, UP, field == 1);
 172   CHECK_SPR_FIELD (SYS, UPR, DCP, field == 0);
 173   CHECK_SPR_FIELD (SYS, UPR, ICP, field == 0);
 174   CHECK_SPR_FIELD (SYS, UPR, DMP, field == 0);
 175   CHECK_SPR_FIELD (SYS, UPR, MP, field == 0);
 176   CHECK_SPR_FIELD (SYS, UPR, IMP, field == 0);
 177   CHECK_SPR_FIELD (SYS, UPR, DUP, field == 0);
 178   CHECK_SPR_FIELD (SYS, UPR, PCUP, field == 0);
 179   CHECK_SPR_FIELD (SYS, UPR, PICP, field == 0);
 180   CHECK_SPR_FIELD (SYS, UPR, PMP, field == 0);
 181   CHECK_SPR_FIELD (SYS, UPR, TTP, field == 0);
 182   CHECK_SPR_FIELD (SYS, UPR, CUP, field == 0);
 183
 184   CHECK_SPR_FIELD (SYS, CPUCFGR, NSGR, field == 0);
 185   CHECK_SPR_FIELD (SYS, CPUCFGR, CGF, field == 0);
 186   CHECK_SPR_FIELD (SYS, CPUCFGR, OB32S, field == 1);
 187   CHECK_SPR_FIELD (SYS, CPUCFGR, OF32S, field == 1);
 188   CHECK_SPR_FIELD (SYS, CPUCFGR, OB64S, field == 0);
 189   CHECK_SPR_FIELD (SYS, CPUCFGR, OF64S, field == 0);
 190   CHECK_SPR_FIELD (SYS, CPUCFGR, OV64S, field == 0);
 191
 192 #undef CHECK_SPR_FIELD
 193
 194   /* Configure the fpu operations and mark fpu available.  */
 195   cgen_init_accurate_fpu (current_cpu, CGEN_CPU_FPU (current_cpu),
 196                           or1k32bf_fpu_error);
 197   SET_H_SYS_CPUCFGR_OF32S (1);
 198
 199   /* Set the UPR[UP] flag, even if the user tried to unset it, as we always
 200      support the Unit Present Register.  */
 201   SET_H_SYS_UPR_UP (1);
 202
 203   /* Set the supervisor register to indicate we are in supervisor mode and
 204      set the Fixed-One bit which must always be set.  */
 205   SET_H_SYS_SR (SPR_FIELD_MASK_SYS_SR_SM | SPR_FIELD_MASK_SYS_SR_FO);
 206
 207   /* Clear the floating point control status register.  */
 208   SET_H_SYS_FPCSR (0);
 209 }
 210
 211 void
 212 or1k32bf_insn_before (sim_cpu *current_cpu, SEM_PC vpc, const IDESC *idesc)
 213 {
 214   SIM_DESC sd = CPU_STATE (current_cpu);
 215   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 216
 217   or1k_cpu->delay_slot = or1k_cpu->next_delay_slot;
 218   or1k_cpu->next_delay_slot = 0;
 219
 220   if (or1k_cpu->delay_slot &&
 221       CGEN_ATTR_BOOLS (CGEN_INSN_ATTRS ((idesc)->idata)) &
 222       CGEN_ATTR_MASK (CGEN_INSN_NOT_IN_DELAY_SLOT))
 223     {
 224       USI pc;
 225 #ifdef WITH_SCACHE
 226       pc = vpc->argbuf.addr;
 227 #else
 228       pc = vpc;
 229 #endif
 230       sim_io_error (sd, "invalid instruction in a delay slot at PC 0x%08x",
 231                     pc);
 232     }
 233
 234 }
 235
 236 void
 237 or1k32bf_insn_after (sim_cpu *current_cpu, SEM_PC vpc, const IDESC *idesc)
 238 {
 239   SIM_DESC sd = CPU_STATE (current_cpu);
 240   struct or1k_sim_cpu *or1k_cpu = OR1K_SIM_CPU (current_cpu);
 241   USI ppc;
 242
 243 #ifdef WITH_SCACHE
 244   ppc = vpc->argbuf.addr;
 245 #else
 246   ppc = vpc;
 247 #endif
 248
 249   SET_H_SYS_PPC (ppc);
 250
 251   if (!GET_H_SYS_CPUCFGR_ND () &&
 252       CGEN_ATTR_BOOLS (CGEN_INSN_ATTRS ((idesc)->idata)) &
 253       CGEN_ATTR_MASK (CGEN_INSN_DELAYED_CTI))
 254     {
 255       SIM_ASSERT (!or1k_cpu->delay_slot);
 256       or1k_cpu->next_delay_slot = 1;
 257     }
 258 }
 259
 260 void
 261 or1k32bf_nop (sim_cpu *current_cpu, USI uimm16)
 262 {
 263   SIM_DESC sd = CPU_STATE (current_cpu);
 264
 265   switch (uimm16)
 266     {
 267
 268     case NOP_NOP:
 269       break;
 270
 271     case NOP_EXIT:
 272       sim_io_printf (CPU_STATE (current_cpu), "exit(%d)\n", GET_H_GPR (3));
 273       ATTRIBUTE_FALLTHROUGH;
 274     case NOP_EXIT_SILENT:
 275       sim_engine_halt (sd, current_cpu, NULL, CPU_PC_GET (current_cpu),
 276                        sim_exited, GET_H_GPR (3));
 277       break;
 278
 279     case NOP_REPORT:
 280       sim_io_printf (CPU_STATE (current_cpu), "report(0x%08x);\n",
 281                      GET_H_GPR (3));
 282       break;
 283
 284     case NOP_PUTC:
 285       sim_io_printf (CPU_STATE (current_cpu), "%c",
 286                      (char) (GET_H_GPR (3) & 0xff));
 287       break;
 288
 289     default:
 290       sim_io_eprintf (sd, "WARNING: l.nop with unsupported code 0x%08x\n",
 291                       uimm16);
 292       break;
 293     }
 294
 295 }
 296
 297 /* Build an address value used for load and store instructions.  For example,
 298    the instruction 'l.lws rD, I(rA)' will require to load data from the 4 byte
 299    address represented by rA + I.  Here the argument base is rA, offset is I
 300    and the size is the read size in bytes.  Note, OpenRISC requires that word
 301    and half-word access be word and half-word aligned respectively, the check
 302    for alignment is not needed here.  */
 303
 304 USI
 305 or1k32bf_make_load_store_addr (sim_cpu *current_cpu, USI base, SI offset,
 306                                int size)
 307 {
 308   SIM_DESC sd = CPU_STATE (current_cpu);
 309
 310   USI addr = base + offset;
 311
 312   /* If little endian load/store is enabled we adjust the byte and half-word
 313      addresses to the little endian equivalent.  */
 314   if (GET_H_SYS_SR_LEE ())
 315     {
 316       switch (size)
 317         {
 318
 319         case 4: /* We are retrieving the entire word no adjustment.  */
 320           break;
 321
 322         case 2: /* Perform half-word adjustment 0 -> 2, 2 -> 0.  */
 323           addr ^= 0x2;
 324           break;
 325
 326         case 1: /* Perform byte adjustment, 0 -> 3, 2 -> 3, etc.  */
 327           addr ^= 0x3;
 328           break;
 329
 330         default:
 331           SIM_ASSERT (0);
 332           return 0;
 333         }
 334     }
 335
 336   return addr;
 337 }
 338
 339 /* The find first 1 instruction returns the location of the first set bit
 340    in the argument register.  */
 341
 342 USI
 343 or1k32bf_ff1 (sim_cpu *current_cpu, USI val)
 344 {
 345   USI bit;
 346   USI ret;
 347   for (bit = 1, ret = 1; bit; bit <<= 1, ret++)
 348     {
 349       if (val & bit)
 350         return ret;
 351     }
 352   return 0;
 353 }
 354
 355 /* The find last 1 instruction returns the location of the last set bit in
 356    the argument register.  */
 357
 358 USI
 359 or1k32bf_fl1 (sim_cpu *current_cpu, USI val)
 360 {
 361   USI bit;
 362   USI ret;
 363   for (bit = 1 << 31, ret = 32; bit; bit >>= 1, ret--)
 364     {
 365       if (val & bit)
 366         return ret;
 367     }
 368   return 0;
 369 }