sim/m32r/m32r2.c

   1 /* m32r2 simulator support code
   2    Copyright (C) 1997-2024 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5    This file is part of GDB, the GNU debugger.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This must come before any other includes.  */
  21 #include "defs.h"
  22
  23 #define WANT_CPU m32r2f
  24 #define WANT_CPU_M32R2F
  25
  26 #include "sim-main.h"
  27 #include "cgen-mem.h"
  28 #include "cgen-ops.h"
  29
  30 #include "m32r-sim.h"
  31
  32 /* The contents of BUF are in target byte order.  */
  33
  34 int
  35 m32r2f_fetch_register (SIM_CPU *current_cpu, int rn, void *buf, int len)
  36 {
  37   return m32rbf_fetch_register (current_cpu, rn, buf, len);
  38 }
  39
  40 /* The contents of BUF are in target byte order.  */
  41
  42 int
  43 m32r2f_store_register (SIM_CPU *current_cpu, int rn, const void *buf, int len)
  44 {
  45   return m32rbf_store_register (current_cpu, rn, buf, len);
  46 }
  47 \f
  48 /* Cover fns to get/set the control registers.
  49    FIXME: Duplicated from m32r.c.  The issue is structure offsets.  */
  50
  51 USI
  52 m32r2f_h_cr_get_handler (SIM_CPU *current_cpu, UINT cr)
  53 {
  54   switch (cr)
  55     {
  56     case H_CR_PSW : /* PSW.  */
  57       return (((CPU (h_bpsw) & 0xc1) << 8)
  58               | ((CPU (h_psw) & 0xc0) << 0)
  59               | GET_H_COND ());
  60     case H_CR_BBPSW : /* Backup backup psw.  */
  61       return CPU (h_bbpsw) & 0xc1;
  62     case H_CR_CBR : /* Condition bit.  */
  63       return GET_H_COND ();
  64     case H_CR_SPI : /* Interrupt stack pointer.  */
  65       if (! GET_H_SM ())
  66         return CPU (h_gr[H_GR_SP]);
  67       else
  68         return CPU (h_cr[H_CR_SPI]);
  69     case H_CR_SPU : /* User stack pointer.  */
  70       if (GET_H_SM ())
  71         return CPU (h_gr[H_GR_SP]);
  72       else
  73         return CPU (h_cr[H_CR_SPU]);
  74     case H_CR_BPC : /* Backup pc.  */
  75       return CPU (h_cr[H_CR_BPC]) & 0xfffffffe;
  76     case H_CR_BBPC : /* Backup backup pc.  */
  77       return CPU (h_cr[H_CR_BBPC]) & 0xfffffffe;
  78     case 4 : /* ??? unspecified, but apparently available */
  79     case 5 : /* ??? unspecified, but apparently available */
  80       return CPU (h_cr[cr]);
  81     default :
  82       return 0;
  83     }
  84 }
  85
  86 void
  87 m32r2f_h_cr_set_handler (SIM_CPU *current_cpu, UINT cr, USI newval)
  88 {
  89   switch (cr)
  90     {
  91     case H_CR_PSW : /* psw */
  92       {
  93         int old_sm = (CPU (h_psw) & 0x80) != 0;
  94         int new_sm = (newval & 0x80) != 0;
  95         CPU (h_bpsw) = (newval >> 8) & 0xff;
  96         CPU (h_psw) = newval & 0xff;
  97         SET_H_COND (newval & 1);
  98         /* When switching stack modes, update the registers.  */
  99         if (old_sm != new_sm)
 100           {
 101             if (old_sm)
 102               {
 103                 /* Switching user -> system.  */
 104                 CPU (h_cr[H_CR_SPU]) = CPU (h_gr[H_GR_SP]);
 105                 CPU (h_gr[H_GR_SP]) = CPU (h_cr[H_CR_SPI]);
 106               }
 107             else
 108               {
 109                 /* Switching system -> user.  */
 110                 CPU (h_cr[H_CR_SPI]) = CPU (h_gr[H_GR_SP]);
 111                 CPU (h_gr[H_GR_SP]) = CPU (h_cr[H_CR_SPU]);
 112               }
 113           }
 114         break;
 115       }
 116     case H_CR_BBPSW : /* backup backup psw */
 117       CPU (h_bbpsw) = newval & 0xff;
 118       break;
 119     case H_CR_CBR : /* condition bit */
 120       SET_H_COND (newval & 1);
 121       break;
 122     case H_CR_SPI : /* interrupt stack pointer */
 123       if (! GET_H_SM ())
 124         CPU (h_gr[H_GR_SP]) = newval;
 125       else
 126         CPU (h_cr[H_CR_SPI]) = newval;
 127       break;
 128     case H_CR_SPU : /* user stack pointer */
 129       if (GET_H_SM ())
 130         CPU (h_gr[H_GR_SP]) = newval;
 131       else
 132         CPU (h_cr[H_CR_SPU]) = newval;
 133       break;
 134     case H_CR_BPC : /* backup pc */
 135       CPU (h_cr[H_CR_BPC]) = newval;
 136       break;
 137     case H_CR_BBPC : /* backup backup pc */
 138       CPU (h_cr[H_CR_BBPC]) = newval;
 139       break;
 140     case 4 : /* ??? unspecified, but apparently available */
 141     case 5 : /* ??? unspecified, but apparently available */
 142       CPU (h_cr[cr]) = newval;
 143       break;
 144     default :
 145       /* ignore */
 146       break;
 147     }
 148 }
 149
 150 /* Cover fns to access h-psw.  */
 151
 152 UQI
 153 m32r2f_h_psw_get_handler (SIM_CPU *current_cpu)
 154 {
 155   return (CPU (h_psw) & 0xfe) | (CPU (h_cond) & 1);
 156 }
 157
 158 void
 159 m32r2f_h_psw_set_handler (SIM_CPU *current_cpu, UQI newval)
 160 {
 161   CPU (h_psw) = newval;
 162   CPU (h_cond) = newval & 1;
 163 }
 164
 165 /* Cover fns to access h-accum.  */
 166
 167 DI
 168 m32r2f_h_accum_get_handler (SIM_CPU *current_cpu)
 169 {
 170   /* Sign extend the top 8 bits.  */
 171   DI r;
 172   r = ANDDI (CPU (h_accum), MAKEDI (0xffffff, 0xffffffff));
 173   r = XORDI (r, MAKEDI (0x800000, 0));
 174   r = SUBDI (r, MAKEDI (0x800000, 0));
 175   return r;
 176 }
 177
 178 void
 179 m32r2f_h_accum_set_handler (SIM_CPU *current_cpu, DI newval)
 180 {
 181   CPU (h_accum) = newval;
 182 }
 183
 184 /* Cover fns to access h-accums.  */
 185
 186 DI
 187 m32r2f_h_accums_get_handler (SIM_CPU *current_cpu, UINT regno)
 188 {
 189   /* FIXME: Yes, this is just a quick hack.  */
 190   DI r;
 191   if (regno == 0)
 192     r = CPU (h_accum);
 193   else
 194     r = CPU (h_accums[1]);
 195   /* Sign extend the top 8 bits.  */
 196   r = ANDDI (r, MAKEDI (0xffffff, 0xffffffff));
 197   r = XORDI (r, MAKEDI (0x800000, 0));
 198   r = SUBDI (r, MAKEDI (0x800000, 0));
 199   return r;
 200 }
 201
 202 void
 203 m32r2f_h_accums_set_handler (SIM_CPU *current_cpu, UINT regno, DI newval)
 204 {
 205   /* FIXME: Yes, this is just a quick hack.  */
 206   if (regno == 0)
 207     CPU (h_accum) = newval;
 208   else
 209     CPU (h_accums[1]) = newval;
 210 }
 211 \f
 212 #if WITH_PROFILE_MODEL_P
 213
 214 /* Initialize cycle counting for an insn.
 215    FIRST_P is non-zero if this is the first insn in a set of parallel
 216    insns.  */
 217
 218 void
 219 m32r2f_model_insn_before (SIM_CPU *cpu, int first_p)
 220 {
 221   m32rbf_model_insn_before (cpu, first_p);
 222 }
 223
 224 /* Record the cycles computed for an insn.
 225    LAST_P is non-zero if this is the last insn in a set of parallel insns,
 226    and we update the total cycle count.
 227    CYCLES is the cycle count of the insn.  */
 228
 229 void
 230 m32r2f_model_insn_after (SIM_CPU *cpu, int last_p, int cycles)
 231 {
 232   m32rbf_model_insn_after (cpu, last_p, cycles);
 233 }
 234
 235 static INLINE void
 236 check_load_stall (SIM_CPU *cpu, int regno)
 237 {
 238   UINT h_gr = CPU_M32R_MISC_PROFILE (cpu)->load_regs;
 239
 240   if (regno != -1
 241       && (h_gr & (1 << regno)) != 0)
 242     {
 243       CPU_M32R_MISC_PROFILE (cpu)->load_stall += 2;
 244       if (TRACE_INSN_P (cpu))
 245         cgen_trace_printf (cpu, " ; Load stall of 2 cycles.");
 246     }
 247 }
 248
 249 int
 250 m32r2f_model_m32r2_u_exec (SIM_CPU *cpu, const IDESC *idesc,
 251                            int unit_num, int referenced,
 252                            INT sr, INT sr2, INT dr)
 253 {
 254   check_load_stall (cpu, sr);
 255   check_load_stall (cpu, sr2);
 256   return idesc->timing->units[unit_num].done;
 257 }
 258
 259 int
 260 m32r2f_model_m32r2_u_cmp (SIM_CPU *cpu, const IDESC *idesc,
 261                            int unit_num, int referenced,
 262                            INT src1, INT src2)
 263 {
 264   check_load_stall (cpu, src1);
 265   check_load_stall (cpu, src2);
 266   return idesc->timing->units[unit_num].done;
 267 }
 268
 269 int
 270 m32r2f_model_m32r2_u_mac (SIM_CPU *cpu, const IDESC *idesc,
 271                            int unit_num, int referenced,
 272                            INT src1, INT src2)
 273 {
 274   check_load_stall (cpu, src1);
 275   check_load_stall (cpu, src2);
 276   return idesc->timing->units[unit_num].done;
 277 }
 278
 279 int
 280 m32r2f_model_m32r2_u_cti (SIM_CPU *cpu, const IDESC *idesc,
 281                           int unit_num, int referenced,
 282                           INT sr)
 283 {
 284   PROFILE_DATA *profile = CPU_PROFILE_DATA (cpu);
 285   int taken_p = (referenced & (1 << 1)) != 0;
 286
 287   check_load_stall (cpu, sr);
 288   if (taken_p)
 289     {
 290       CPU_M32R_MISC_PROFILE (cpu)->cti_stall += 2;
 291       PROFILE_MODEL_TAKEN_COUNT (profile) += 1;
 292     }
 293   else
 294     PROFILE_MODEL_UNTAKEN_COUNT (profile) += 1;
 295   return idesc->timing->units[unit_num].done;
 296 }
 297
 298 int
 299 m32r2f_model_m32r2_u_load (SIM_CPU *cpu, const IDESC *idesc,
 300                            int unit_num, int referenced,
 301                            INT sr, INT dr)
 302 {
 303   CPU_M32R_MISC_PROFILE (cpu)->load_regs_pending |= (1 << dr);
 304   return idesc->timing->units[unit_num].done;
 305 }
 306
 307 int
 308 m32r2f_model_m32r2_u_store (SIM_CPU *cpu, const IDESC *idesc,
 309                             int unit_num, int referenced,
 310                             INT src1, INT src2)
 311 {
 312   return idesc->timing->units[unit_num].done;
 313 }
 314
 315 #endif /* WITH_PROFILE_MODEL_P */