sim/erc32/interf.c

   1 /*
   2  * This file is part of SIS.
   3  *
   4  * SIS, SPARC instruction simulator V1.6 Copyright (C) 1995 Jiri Gaisler,
   5  * European Space Agency
   6  *
   7  * This program is free software; you can redistribute it and/or modify it under
   8  * the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 675
  19  * Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #include <signal.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include "sis.h"
  27 #include "bfd.h"
  28 #include <dis-asm.h>
  29
  30 #ifndef fprintf
  31 extern          fprintf();
  32 #endif
  33
  34 #define VAL(x)  strtol(x,(char *)NULL,0)
  35
  36 extern char   **buildargv(char *input);
  37
  38 extern struct disassemble_info dinfo;
  39 extern struct pstate sregs;
  40 extern struct estate ebase;
  41
  42 extern int      ctrl_c;
  43 extern int      nfp;
  44 extern int      sis_verbose;
  45 extern char    *sis_version;
  46 extern struct estate ebase;
  47 extern struct evcell evbuf[];
  48 extern struct irqcell irqarr[];
  49 extern int      irqpend, ext_irl;
  50 extern char     uart_dev1[], uart_dev2[];
  51
  52 int             sis_gdb_break = 1;
  53
  54 #ifdef IUREV0
  55 extern int      iurev0;
  56 #endif
  57
  58 #ifdef MECREV0
  59 extern int      mecrev0;
  60 #endif
  61
  62 run_sim(sregs, go, icount, dis)
  63     struct pstate  *sregs;
  64     int             go;
  65     unsigned int    icount;
  66     int             dis;
  67 {
  68     int             mexc, ws;
  69
  70     if (sis_verbose)
  71         printf_filtered("resuming at %x\n", sregs->pc);
  72     sregs->starttime = time(NULL);
  73     while ((!sregs->err_mode & (go || (icount > 0))) &&
  74            ((sregs->bptnum == 0) || !(sregs->bphit = check_bpt(sregs)))) {
  75
  76         sregs->fhold = 0;
  77         sregs->hold = 0;
  78         sregs->icnt = 0;
  79
  80         check_interrupts(sregs);
  81         if (sregs->trap) {
  82             sregs->err_mode = execute_trap(sregs);
  83         } else {
  84             if (sregs->psr & 0x080)
  85                 sregs->asi = 8;
  86             else
  87                 sregs->asi = 9;
  88 #ifdef IUREV0
  89             if (iurev0 && sregs->rett_err) {
  90                 sregs->asi &= ~0x1;
  91                 sregs->asi |= ((sregs->psr & 0x040) >> 6);
  92             }
  93 #endif
  94
  95             mexc = memory_read(sregs->asi, sregs->pc, &sregs->inst, &sregs->hold);
  96             if (sregs->annul) {
  97                 sregs->annul = 0;
  98                 sregs->icnt = 1;
  99                 sregs->pc = sregs->npc;
 100                 sregs->npc = sregs->npc + 4;
 101             } else {
 102                 if (mexc) {
 103                     sregs->trap = I_ACC_EXC;
 104                 } else {
 105                     if (sregs->histlen) {
 106                         sregs->histbuf[sregs->histind].addr = sregs->pc;
 107                         sregs->histbuf[sregs->histind].time = ebase.simtime;
 108                         sregs->histind++;
 109                         if (sregs->histind >= sregs->histlen)
 110                             sregs->histind = 0;
 111                     }
 112                     if (dis) {
 113                         printf(" %8d ", ebase.simtime);
 114                         dis_mem(sregs->pc, 1, &dinfo);
 115                     }
 116                     if ((sis_gdb_break) && (sregs->inst == 0x91d02001)) {
 117                         if (sis_verbose)
 118                             printf_filtered("SW BP hit at %x\n", sregs->pc);
 119                         return (BPT_HIT);
 120                     } else
 121                         dispatch_instruction(sregs);
 122                 }
 123                 icount--;
 124             }
 125             if (sregs->trap) {
 126                 sregs->err_mode = execute_trap(sregs);
 127             }
 128         }
 129         advance_time(sregs);
 130         if (ctrl_c) {
 131             go = icount = 0;
 132         }
 133     }
 134     sregs->tottime += time(NULL) - sregs->starttime;
 135     if (sregs->err_mode)
 136         error_mode(sregs->pc);
 137     if (sregs->err_mode)
 138         return (ERROR);
 139     if (sregs->bphit) {
 140         if (sis_verbose)
 141             printf_filtered("HW BP hit at %x\n", sregs->pc);
 142         return (BPT_HIT);
 143     }
 144     if (ctrl_c) {
 145         ctrl_c = 0;
 146         return (CTRL_C);
 147     }
 148     return (TIME_OUT);
 149 }
 150
 151
 152 void
 153 sim_open(char *args)
 154 {
 155
 156     int             argc = 0;
 157     char          **argv;
 158     int             cont = 1;
 159     int             stat = 0;
 160     int             grdl = 0;
 161     int             freq = 15;
 162
 163     printf_filtered("\n SIS - SPARC instruction simulator %s\n", sis_version);
 164     printf_filtered(" Bug-reports to Jiri Gaisler ESA/ESTEC (jgais@wd.estec.esa.nl)\n");
 165     argv = buildargv(args);
 166     if (argv != NULL)
 167         while (argv[argc])
 168             argc++;
 169     while (stat < argc) {
 170         if (argv[stat][0] == '-') {
 171             if (strcmp(argv[stat], "-v") == 0) {
 172                 sis_verbose = 1;
 173             }
 174 #ifdef IUREV0
 175             if (strcmp(argv[stat], "-iurev0") == 0) {
 176                 iurev0 = 1;
 177                 printf_filtered(" simulating IU rev.0 jmpl/restore bug\n");
 178             }
 179 #endif
 180 #ifdef MECREV0
 181             if (strcmp(argv[stat], "-mecrev0") == 0) {
 182                 mecrev0 = 1;
 183                 printf_filtered(" simulating MEC rev.0 timer and uart interrupt bug\n");
 184             }
 185 #endif
 186             if (strcmp(argv[stat], "-nfp") == 0) {
 187                 printf_filtered("no FPU\n");
 188                 nfp = 1;
 189             }
 190             if (strcmp(argv[stat], "-uart1") == 0) {
 191                 if ((stat + 1) < argc)
 192                     strcpy(uart_dev1, argv[++stat]);
 193             }
 194             if (strcmp(argv[stat], "-uart2") == 0) {
 195                 if ((stat + 1) < argc)
 196                     strcpy(uart_dev2, argv[++stat]);
 197             }
 198             if (strcmp(argv[stat], "-nogdb") == 0) {
 199                 printf_filtered("disabling GDB trap handling for breakpoints\n");
 200                 sis_gdb_break = 0;
 201             }
 202             if (strcmp(argv[stat], "-freq") == 0)
 203                 if ((stat + 1) < argc) {
 204                     freq = VAL(argv[++stat]);
 205                     printf_filtered(" ERC32 freq %d Mhz\n", freq);
 206                 }
 207         } else
 208             bfd_load(argv[stat]);
 209         stat++;
 210     }
 211     freeargv(argv);
 212     sregs.freq = freq;
 213
 214     INIT_DISASSEMBLE_INFO(dinfo, stdout, fprintf);
 215     init_signals();
 216     reset_all();
 217     ebase.simtime = 0;
 218     init_sim();
 219     init_bpt(&sregs);
 220     reset_stat(&sregs);
 221 }
 222
 223 void
 224 sim_close(int quitting)
 225 {
 226
 227     exit_sim();
 228
 229 };
 230
 231 int
 232 sim_load(char *prog, int from_tty)
 233 {
 234     bfd_load(*prog);
 235     return (0);
 236 }
 237
 238 void
 239 sim_create_inferior(int start_address, char **argv, char **env)
 240 {
 241     ebase.simtime = 0;
 242     reset_all();
 243     reset_stat(&sregs);
 244     sregs.pc = start_address & ~3;
 245     sregs.npc = sregs.pc + 4;
 246
 247 }
 248
 249 void
 250 sim_store_register(regno, value)
 251     int             regno;
 252     unsigned char  *value;
 253 {
 254     /* FIXME: Review the computation of regval.  */
 255     int             regval = (value[0] << 24) | (value[1] << 16) | (value[2] << 8) | value[3];
 256     set_regi(&sregs, regno, regval);
 257 }
 258
 259
 260 void
 261 sim_fetch_register(regno, buf)
 262     int             regno;
 263     unsigned char  *buf;
 264 {
 265     get_regi(&sregs, regno, buf);
 266 }
 267
 268 int
 269 sim_write(mem, buf, length)
 270     int             mem;
 271     unsigned char  *buf;
 272     int             length;
 273 {
 274     return (sis_memory_write(mem, buf, length));
 275 }
 276
 277 int
 278 sim_read(int mem, unsigned char *buf, int length)
 279 {
 280     return (sis_memory_read(mem, buf, length));
 281 }
 282
 283 void
 284 sim_info(int verbose)
 285 {
 286     show_stat(&sregs);
 287
 288
 289 }
 290
 291 int             simstat = OK;
 292
 293 enum sim_stop {
 294     sim_exited, sim_stopped, sim_signalled
 295 };
 296
 297 void
 298 sim_stop_reason(enum sim_stop * reason, int *sigrc)
 299 {
 300
 301     switch (simstat) {
 302         case CTRL_C:
 303         *reason = sim_stopped;
 304         *sigrc = SIGINT;
 305         break;
 306     case OK:
 307     case TIME_OUT:
 308     case BPT_HIT:
 309         *reason = sim_stopped;
 310         *sigrc = SIGTRAP;
 311         break;
 312     case ERROR:
 313         *sigrc = 0;
 314         *reason = sim_exited;
 315     }
 316     ctrl_c = 0;
 317     simstat = OK;
 318 }
 319
 320
 321 void
 322 sim_resume(int step, int siggnal)
 323 {
 324     simstat = run_sim(&sregs, 1, 0, 0);
 325 }
 326
 327 void
 328 sim_kill(void)
 329 {
 330 };
 331
 332
 333
 334 void
 335 sim_do_command(cmd)
 336     char           *cmd;
 337 {
 338     exec_cmd(&sregs, cmd);
 339 }
 340
 341
 342
 343 int
 344 sim_insert_breakpoint(int addr)
 345 {
 346     if (sregs.bptnum < BPT_MAX) {
 347         sregs.bpts[sregs.bptnum] = addr & ~0x3;
 348         sregs.bptnum++;
 349         if (sis_verbose)
 350             printf_filtered("inserted HW BP at %x\n", addr);
 351         return 0;
 352     } else
 353         return 1;
 354 }
 355
 356 int
 357 sim_remove_breakpoint(int addr)
 358 {
 359     int             i = 0;
 360
 361     while ((i < sregs.bptnum) && (sregs.bpts[i] != addr))
 362         i++;
 363     if (addr == sregs.bpts[i]) {
 364         for (; i < sregs.bptnum - 1; i++)
 365             sregs.bpts[i] = sregs.bpts[i + 1];
 366         sregs.bptnum -= 1;
 367         if (sis_verbose)
 368             printf_filtered("removed HW BP at %x\n", addr);
 369         return 0;
 370     }
 371     return 1;
 372 }