sim/common/sim-hw.c

   1 /* Simulator hardware option handling.
   2    Copyright (C) 1998-2021 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support and Andrew Cagney.
   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 #include "sim-main.h"
  24 #include "sim-assert.h"
  25 #include "sim-options.h"
  26 #include "sim/callback.h"
  27
  28 #include "sim-hw.h"
  29
  30 #include "hw-tree.h"
  31 #include "hw-device.h"
  32 #include "hw-main.h"
  33 #include "hw-base.h"
  34
  35 #include <string.h>
  36 #include <stdlib.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39
  40
  41 struct sim_hw {
  42   struct hw *tree;
  43   int trace_p;
  44   int info_p;
  45   /* if called from a processor */
  46   sim_cpu *cpu;
  47   sim_cia cia;
  48 };
  49
  50
  51 struct hw *
  52 sim_hw_parse (struct sim_state *sd,
  53               const char *fmt,
  54               ...)
  55 {
  56   struct hw *current;
  57   va_list ap;
  58   va_start (ap, fmt);
  59   current = hw_tree_vparse (STATE_HW (sd)->tree, fmt, ap);
  60   va_end (ap);
  61   return current;
  62 }
  63
  64 struct printer {
  65   struct sim_state *file;
  66   void (*print) (struct sim_state *, const char *, va_list ap);
  67 };
  68
  69 static void
  70 do_print (void *file, const char *fmt, ...)
  71 {
  72   struct printer *p = file;
  73   va_list ap;
  74   va_start (ap, fmt);
  75   p->print (p->file, fmt, ap);
  76   va_end (ap);
  77 }
  78
  79 void
  80 sim_hw_print (struct sim_state *sd,
  81               void (*print) (struct sim_state *, const char *, va_list ap))
  82 {
  83   struct printer p;
  84   p.file = sd;
  85   p.print = print;
  86   hw_tree_print (STATE_HW (sd)->tree, do_print, &p);
  87 }
  88
  89
  90
  91
  92 /* command line options. */
  93
  94 enum {
  95   OPTION_HW_INFO = OPTION_START,
  96   OPTION_HW_TRACE,
  97   OPTION_HW_DEVICE,
  98   OPTION_HW_LIST,
  99   OPTION_HW_FILE,
 100 };
 101
 102 static DECLARE_OPTION_HANDLER (hw_option_handler);
 103
 104 static const OPTION hw_options[] =
 105 {
 106   { {"hw-info", no_argument, NULL, OPTION_HW_INFO },
 107       '\0', NULL, "List configurable hw regions",
 108       hw_option_handler, NULL },
 109   { {"info-hw", no_argument, NULL, OPTION_HW_INFO },
 110       '\0', NULL, NULL,
 111       hw_option_handler, NULL },
 112
 113   { {"hw-trace", optional_argument, NULL, OPTION_HW_TRACE },
 114       '\0', "on|off", "Trace all hardware devices",
 115       hw_option_handler, NULL },
 116   { {"trace-hw", optional_argument, NULL, OPTION_HW_TRACE },
 117       '\0', NULL, NULL,
 118       hw_option_handler, NULL },
 119
 120   { {"hw-device", required_argument, NULL, OPTION_HW_DEVICE },
 121       '\0', "DEVICE", "Add the specified device",
 122       hw_option_handler, NULL },
 123
 124   { {"hw-list", no_argument, NULL, OPTION_HW_LIST },
 125       '\0', NULL, "List the device tree",
 126       hw_option_handler, NULL },
 127
 128   { {"hw-file", required_argument, NULL, OPTION_HW_FILE },
 129       '\0', "FILE", "Add the devices listed in the file",
 130       hw_option_handler, NULL },
 131
 132   { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
 133 };
 134
 135
 136
 137 /* Copied from ../ppc/psim.c:psim_merge_device_file() */
 138
 139 static SIM_RC
 140 merge_device_file (struct sim_state *sd,
 141                    const char *file_name)
 142 {
 143   FILE *description;
 144   struct hw *current = STATE_HW (sd)->tree;
 145   char *device_path = NULL;
 146   size_t buf_size = 0;
 147   ssize_t device_path_len;
 148
 149   /* try opening the file */
 150   description = fopen (file_name, "r");
 151   if (description == NULL)
 152     {
 153       perror (file_name);
 154       return SIM_RC_FAIL;
 155     }
 156
 157   while ((device_path_len = getline (&device_path, &buf_size, description)) > 0)
 158     {
 159       char *device;
 160       char *next_line = NULL;
 161
 162       if (device_path[device_path_len - 1] == '\n')
 163         device_path[--device_path_len] = '\0';
 164
 165       /* skip comments ("#" or ";") and blank lines lines */
 166       for (device = device_path;
 167            *device != '\0' && isspace (*device);
 168            device++);
 169       if (device[0] == '#'
 170           || device[0] == ';'
 171           || device[0] == '\0')
 172         continue;
 173
 174       /* merge any appended lines */
 175       while (device_path[device_path_len - 1] == '\\')
 176         {
 177           size_t next_buf_size = 0;
 178           ssize_t next_line_len;
 179
 180           /* zap the `\' at the end of the line */
 181           device_path[--device_path_len] = '\0';
 182
 183           /* get the next line */
 184           next_line_len = getline (&next_line, &next_buf_size, description);
 185           if (next_line_len <= 0)
 186             break;
 187
 188           if (next_line[next_line_len - 1] == '\n')
 189             next_line[--next_line_len] = '\0';
 190
 191           /* append the next line */
 192           if (buf_size - device_path_len <= next_line_len)
 193             {
 194               ptrdiff_t offset = device - device_path;
 195
 196               buf_size += next_buf_size;
 197               device_path = xrealloc (device_path, buf_size);
 198               device = device_path + offset;
 199             }
 200           memcpy (device_path + device_path_len, next_line,
 201                   next_line_len + 1);
 202           device_path_len += next_line_len;
 203         }
 204       free (next_line);
 205
 206       /* parse this line */
 207       current = hw_tree_parse (current, "%s", device);
 208     }
 209
 210   free (device_path);
 211   fclose (description);
 212   return SIM_RC_OK;
 213 }
 214
 215
 216 static SIM_RC
 217 hw_option_handler (struct sim_state *sd, sim_cpu *cpu, int opt,
 218                    char *arg, int is_command)
 219 {
 220   switch (opt)
 221     {
 222
 223     case OPTION_HW_INFO:
 224       {
 225         /* delay info until after the tree is finished */
 226         STATE_HW (sd)->info_p = 1;
 227         return SIM_RC_OK;
 228         break;
 229       }
 230
 231     case OPTION_HW_TRACE:
 232       {
 233         if (arg == NULL)
 234           {
 235             STATE_HW (sd)->trace_p = 1;
 236           }
 237         else if (strcmp (arg, "yes") == 0
 238                  || strcmp (arg, "on") == 0)
 239           {
 240             STATE_HW (sd)->trace_p = 1;
 241           }
 242         else if (strcmp (arg, "no") == 0
 243                  || strcmp (arg, "off") == 0)
 244           {
 245             STATE_HW (sd)->trace_p = 0;
 246           }
 247         else
 248           {
 249             sim_io_eprintf (sd, "Option --hw-trace ignored\n");
 250             /* set tracing on all devices */
 251             return SIM_RC_FAIL;
 252           }
 253         /* FIXME: Not very nice - see also hw-base.c */
 254         if (STATE_HW (sd)->trace_p)
 255           hw_tree_parse (STATE_HW (sd)->tree, "/global-trace? true");
 256         return SIM_RC_OK;
 257         break;
 258       }
 259
 260     case OPTION_HW_DEVICE:
 261       {
 262         hw_tree_parse (STATE_HW (sd)->tree, "%s", arg);
 263         return SIM_RC_OK;
 264       }
 265
 266     case OPTION_HW_LIST:
 267       {
 268         sim_hw_print (sd, sim_io_vprintf);
 269         return SIM_RC_OK;
 270       }
 271
 272     case OPTION_HW_FILE:
 273       {
 274         return merge_device_file (sd, arg);
 275       }
 276
 277     default:
 278       sim_io_eprintf (sd, "Unknown hw option %d\n", opt);
 279       return SIM_RC_FAIL;
 280
 281     }
 282
 283   return SIM_RC_FAIL;
 284 }
 285
 286
 287 /* "hw" module install handler.
 288
 289    This is called via sim_module_install to install the "hw" subsystem
 290    into the simulator.  */
 291
 292 static MODULE_INIT_FN sim_hw_init;
 293 static MODULE_UNINSTALL_FN sim_hw_uninstall;
 294
 295 /* Provide a prototype to silence -Wmissing-prototypes.  */
 296 SIM_RC sim_install_hw (struct sim_state *sd);
 297
 298 /* Establish this object.  */
 299 SIM_RC
 300 sim_install_hw (struct sim_state *sd)
 301 {
 302   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 303   sim_add_option_table (sd, NULL, hw_options);
 304   sim_module_add_uninstall_fn (sd, sim_hw_uninstall);
 305   sim_module_add_init_fn (sd, sim_hw_init);
 306   STATE_HW (sd) = ZALLOC (struct sim_hw);
 307   STATE_HW (sd)->tree = hw_tree_create (sd, "core");
 308   return SIM_RC_OK;
 309 }
 310
 311
 312 static SIM_RC
 313 sim_hw_init (struct sim_state *sd)
 314 {
 315   /* FIXME: anything needed? */
 316   hw_tree_finish (STATE_HW (sd)->tree);
 317   if (STATE_HW (sd)->info_p)
 318     sim_hw_print (sd, sim_io_vprintf);
 319   return SIM_RC_OK;
 320 }
 321
 322 /* Uninstall the "hw" subsystem from the simulator.  */
 323
 324 static void
 325 sim_hw_uninstall (struct sim_state *sd)
 326 {
 327   hw_tree_delete (STATE_HW (sd)->tree);
 328   free (STATE_HW (sd));
 329   STATE_HW (sd) = NULL;
 330 }
 331
 332
 333 \f
 334 /* Data transfers to/from the hardware device tree.  There are several
 335    cases. */
 336
 337
 338 /* CPU: The simulation is running and the current CPU/CIA
 339    initiates a data transfer. */
 340
 341 void
 342 sim_cpu_hw_io_read_buffer (sim_cpu *cpu,
 343                            sim_cia cia,
 344                            struct hw *hw,
 345                            void *dest,
 346                            int space,
 347                            unsigned_word addr,
 348                            unsigned nr_bytes)
 349 {
 350   SIM_DESC sd = CPU_STATE (cpu);
 351   STATE_HW (sd)->cpu = cpu;
 352   STATE_HW (sd)->cia = cia;
 353   if (hw_io_read_buffer (hw, dest, space, addr, nr_bytes) != nr_bytes)
 354     sim_engine_abort (sd, cpu, cia, "broken CPU read");
 355 }
 356
 357 void
 358 sim_cpu_hw_io_write_buffer (sim_cpu *cpu,
 359                             sim_cia cia,
 360                             struct hw *hw,
 361                             const void *source,
 362                             int space,
 363                             unsigned_word addr,
 364                             unsigned nr_bytes)
 365 {
 366   SIM_DESC sd = CPU_STATE (cpu);
 367   STATE_HW (sd)->cpu = cpu;
 368   STATE_HW (sd)->cia = cia;
 369   if (hw_io_write_buffer (hw, source, space, addr, nr_bytes) != nr_bytes)
 370     sim_engine_abort (sd, cpu, cia, "broken CPU write");
 371 }
 372
 373
 374
 375
 376 /* SYSTEM: A data transfer is being initiated by the system. */
 377
 378 unsigned
 379 sim_hw_io_read_buffer (struct sim_state *sd,
 380                        struct hw *hw,
 381                        void *dest,
 382                        int space,
 383                        unsigned_word addr,
 384                        unsigned nr_bytes)
 385 {
 386   STATE_HW (sd)->cpu = NULL;
 387   return hw_io_read_buffer (hw, dest, space, addr, nr_bytes);
 388 }
 389
 390 unsigned
 391 sim_hw_io_write_buffer (struct sim_state *sd,
 392                         struct hw *hw,
 393                         const void *source,
 394                         int space,
 395                         unsigned_word addr,
 396                         unsigned nr_bytes)
 397 {
 398   STATE_HW (sd)->cpu = NULL;
 399   return hw_io_write_buffer (hw, source, space, addr, nr_bytes);
 400 }
 401
 402
 403 \f
 404 /* Abort the simulation specifying HW as the reason */
 405
 406 void
 407 hw_vabort (struct hw *me,
 408            const char *fmt,
 409            va_list ap)
 410 {
 411   const char *name;
 412   char *msg;
 413   /* find an identity */
 414   if (me != NULL && hw_path (me) != NULL && hw_path (me) [0] != '\0')
 415     name = hw_path (me);
 416   else if (me != NULL && hw_name (me) != NULL && hw_name (me)[0] != '\0')
 417     name = hw_name (me);
 418   else if (me != NULL && hw_family (me) != NULL && hw_family (me)[0] != '\0')
 419     name = hw_family (me);
 420   else
 421     name = "device";
 422   /* construct an updated format string */
 423   msg = alloca (strlen (name) + strlen (": ") + strlen (fmt) + 1);
 424   strcpy (msg, name);
 425   strcat (msg, ": ");
 426   strcat (msg, fmt);
 427   /* report the problem */
 428   sim_engine_vabort (hw_system (me),
 429                      STATE_HW (hw_system (me))->cpu,
 430                      STATE_HW (hw_system (me))->cia,
 431                      msg, ap);
 432 }
 433
 434 void
 435 hw_abort (struct hw *me,
 436           const char *fmt,
 437           ...)
 438 {
 439   va_list ap;
 440   /* report the problem */
 441   va_start (ap, fmt);
 442   hw_vabort (me, fmt, ap);
 443   va_end (ap);
 444 }
 445
 446 void
 447 sim_hw_abort (struct sim_state *sd,
 448               struct hw *me,
 449               const char *fmt,
 450               ...)
 451 {
 452   va_list ap;
 453   va_start (ap, fmt);
 454   if (me == NULL)
 455     sim_engine_vabort (sd, NULL, NULL_CIA, fmt, ap);
 456   else
 457     hw_vabort (me, fmt, ap);
 458   va_end (ap);
 459 }
 460
 461
 462 /* MISC routines to tie HW into the rest of the system */
 463
 464 void
 465 hw_halt (struct hw *me,
 466          int reason,
 467          int status)
 468 {
 469   struct sim_state *sd = hw_system (me);
 470   struct sim_hw *sim = STATE_HW (sd);
 471   sim_engine_halt (sd, sim->cpu, NULL, sim->cia, reason, status);
 472 }
 473
 474 struct _sim_cpu *
 475 hw_system_cpu (struct hw *me)
 476 {
 477   return STATE_HW (hw_system (me))->cpu;
 478 }
 479
 480 void
 481 hw_trace (struct hw *me,
 482           const char *fmt,
 483           ...)
 484 {
 485   if (hw_trace_p (me)) /* to be sure, to be sure */
 486     {
 487       va_list ap;
 488       va_start (ap, fmt);
 489       sim_io_eprintf (hw_system (me), "%s: ", hw_path (me));
 490       sim_io_evprintf (hw_system (me), fmt, ap);
 491       sim_io_eprintf (hw_system (me), "\n");
 492       va_end (ap);
 493     }
 494 }
 495
 496
 497 /* Based on gdb-4.17/sim/ppc/main.c:sim_io_read_stdin() */
 498
 499 int
 500 do_hw_poll_read (struct hw *me,
 501                  do_hw_poll_read_method *read,
 502                  int sim_io_fd,
 503                  void *buf,
 504                  unsigned sizeof_buf)
 505 {
 506   int status = read (hw_system (me), sim_io_fd, buf, sizeof_buf);
 507   if (status > 0)
 508     return status;
 509   else if (status == 0 && sizeof_buf == 0)
 510     return 0;
 511   else if (status == 0)
 512     return HW_IO_EOF;
 513   else /* status < 0 */
 514     {
 515 #ifdef EAGAIN
 516       if (STATE_CALLBACK (hw_system (me))->last_errno == EAGAIN)
 517         return HW_IO_NOT_READY;
 518       else
 519         return HW_IO_EOF;
 520 #else
 521       return HW_IO_EOF;
 522 #endif
 523     }
 524 }