| 1 | /* This file is part of the program psim. |
| 2 | |
| 3 | Copyright (C) 1994-1996,1998, Andrew Cagney <cagney@highland.com.au> |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #include <signal.h> /* FIXME - should be machine dependant version */ |
| 23 | #include <stdarg.h> |
| 24 | #include <ctype.h> |
| 25 | |
| 26 | #include "psim.h" |
| 27 | #include "options.h" |
| 28 | |
| 29 | #undef printf_filtered /* blow away the mapping */ |
| 30 | |
| 31 | #ifdef HAVE_STDLIB_H |
| 32 | #include <stdlib.h> |
| 33 | #endif |
| 34 | |
| 35 | #ifdef HAVE_STRING_H |
| 36 | #include <string.h> |
| 37 | #else |
| 38 | #ifdef HAVE_STRINGS_H |
| 39 | #include <strings.h> |
| 40 | #endif |
| 41 | #endif |
| 42 | |
| 43 | #include "defs.h" |
| 44 | #include "bfd.h" |
| 45 | #include "gdb/callback.h" |
| 46 | #include "gdb/remote-sim.h" |
| 47 | |
| 48 | /* Define the rate at which the simulator should poll the host |
| 49 | for a quit. */ |
| 50 | #ifndef POLL_QUIT_INTERVAL |
| 51 | #define POLL_QUIT_INTERVAL 0x20 |
| 52 | #endif |
| 53 | |
| 54 | static int poll_quit_count = POLL_QUIT_INTERVAL; |
| 55 | |
| 56 | /* Structures used by the simulator, for gdb just have static structures */ |
| 57 | |
| 58 | static psim *simulator; |
| 59 | static device *root_device; |
| 60 | static host_callback *callbacks; |
| 61 | |
| 62 | /* We use GDB's gdbarch_register_name function to map GDB register |
| 63 | numbers onto names, which we can then look up in the register |
| 64 | table. Since the `set architecture' command can select a new |
| 65 | processor variant at run-time, the meanings of the register numbers |
| 66 | can change, so we need to make sure the sim uses the same |
| 67 | name/number mapping that GDB uses. |
| 68 | |
| 69 | (We don't use the REGISTER_NAME macro, which is a wrapper for |
| 70 | gdbarch_register_name. We #include GDB's "defs.h", which tries to |
| 71 | #include GDB's "config.h", but gets ours instead, and REGISTER_NAME |
| 72 | ends up not getting defined. Simpler to just use |
| 73 | gdbarch_register_name directly.) |
| 74 | |
| 75 | We used to just use the REGISTER_NAMES macro from GDB's |
| 76 | target-dependent header files, which expanded into an initializer |
| 77 | for an array of strings. That was kind of nice, because it meant |
| 78 | that libsim.a had only a compile-time dependency on GDB; using |
| 79 | gdbarch_register_name directly means that there are now link-time |
| 80 | and run-time dependencies too. |
| 81 | |
| 82 | Perhaps the host_callback structure could provide a function for |
| 83 | retrieving register names; that would be cleaner. */ |
| 84 | |
| 85 | SIM_DESC |
| 86 | sim_open (SIM_OPEN_KIND kind, |
| 87 | host_callback *callback, |
| 88 | struct _bfd *abfd, |
| 89 | char **argv) |
| 90 | { |
| 91 | callbacks = callback; |
| 92 | |
| 93 | /* Note: The simulation is not created by sim_open() because |
| 94 | complete information is not yet available */ |
| 95 | /* trace the call */ |
| 96 | TRACE(trace_gdb, ("sim_open called\n")); |
| 97 | |
| 98 | if (root_device != NULL) |
| 99 | sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n"); |
| 100 | root_device = psim_tree(); |
| 101 | simulator = NULL; |
| 102 | |
| 103 | psim_options(root_device, argv + 1); |
| 104 | |
| 105 | if (ppc_trace[trace_opts]) |
| 106 | print_options (); |
| 107 | |
| 108 | /* fudge our descriptor for now */ |
| 109 | return (SIM_DESC) 1; |
| 110 | } |
| 111 | |
| 112 | |
| 113 | void |
| 114 | sim_close (SIM_DESC sd, int quitting) |
| 115 | { |
| 116 | TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting)); |
| 117 | if (ppc_trace[trace_print_info] && simulator != NULL) |
| 118 | psim_print_info (simulator, ppc_trace[trace_print_info]); |
| 119 | } |
| 120 | |
| 121 | |
| 122 | SIM_RC |
| 123 | sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty) |
| 124 | { |
| 125 | TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n", |
| 126 | prog, from_tty)); |
| 127 | ASSERT(prog != NULL); |
| 128 | |
| 129 | /* create the simulator */ |
| 130 | TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n")); |
| 131 | simulator = psim_create(prog, root_device); |
| 132 | |
| 133 | /* bring in all the data section */ |
| 134 | psim_init(simulator); |
| 135 | |
| 136 | /* get the start address */ |
| 137 | if (abfd == NULL) |
| 138 | { |
| 139 | abfd = bfd_openr (prog, 0); |
| 140 | if (abfd == NULL) |
| 141 | error ("psim: can't open \"%s\": %s\n", |
| 142 | prog, bfd_errmsg (bfd_get_error ())); |
| 143 | if (!bfd_check_format (abfd, bfd_object)) |
| 144 | { |
| 145 | const char *errmsg = bfd_errmsg (bfd_get_error ()); |
| 146 | bfd_close (abfd); |
| 147 | error ("psim: \"%s\" is not an object file: %s\n", |
| 148 | prog, errmsg); |
| 149 | } |
| 150 | bfd_close (abfd); |
| 151 | } |
| 152 | |
| 153 | return SIM_RC_OK; |
| 154 | } |
| 155 | |
| 156 | |
| 157 | int |
| 158 | sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) |
| 159 | { |
| 160 | int result = psim_read_memory(simulator, MAX_NR_PROCESSORS, |
| 161 | buf, mem, length); |
| 162 | TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n", |
| 163 | (long)mem, (long)buf, length, result)); |
| 164 | return result; |
| 165 | } |
| 166 | |
| 167 | |
| 168 | int |
| 169 | sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) |
| 170 | { |
| 171 | int result = psim_write_memory(simulator, MAX_NR_PROCESSORS, |
| 172 | buf, mem, length, |
| 173 | 1/*violate_ro*/); |
| 174 | TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n", |
| 175 | (long)mem, (long)buf, length, result)); |
| 176 | return result; |
| 177 | } |
| 178 | |
| 179 | |
| 180 | int |
| 181 | sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length) |
| 182 | { |
| 183 | char *regname; |
| 184 | |
| 185 | if (simulator == NULL) { |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | /* GDB will sometimes ask for the contents of a register named ""; |
| 190 | we ignore such requests, and leave garbage in *BUF. In GDB |
| 191 | terms, the empty string means "the register with this number is |
| 192 | not present in the currently selected architecture variant." |
| 193 | That's following the kludge we're using for the MIPS processors. |
| 194 | But there are loops that just walk through the entire list of |
| 195 | names and try to get everything. */ |
| 196 | regname = gdbarch_register_name (current_gdbarch, regno); |
| 197 | /* FIXME: ezannoni 2002/04/15 Remove the 'vr' and 'vscr' check |
| 198 | once AltiVec support is committed. */ |
| 199 | if (! regname || regname[0] == '\0' |
| 200 | || (regname[0] == 'v' && regname[1] == 'r') |
| 201 | || (strcmp (regname, "vscr") == 0)) |
| 202 | return -1; |
| 203 | |
| 204 | TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n", |
| 205 | regno, regname, (long)buf)); |
| 206 | psim_read_register(simulator, MAX_NR_PROCESSORS, |
| 207 | buf, regname, raw_transfer); |
| 208 | return -1; |
| 209 | } |
| 210 | |
| 211 | |
| 212 | int |
| 213 | sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length) |
| 214 | { |
| 215 | char *regname; |
| 216 | |
| 217 | if (simulator == NULL) |
| 218 | return 0; |
| 219 | |
| 220 | /* See comments in sim_fetch_register, above. */ |
| 221 | regname = gdbarch_register_name (current_gdbarch, regno); |
| 222 | /* FIXME: ezannoni 2002/04/15 Remove the 'vr' and 'vscr' check |
| 223 | once AltiVec support is committed. */ |
| 224 | if (! regname || regname[0] == '\0' |
| 225 | || (regname[0] == 'v' && regname[1] == 'r') |
| 226 | || (strcmp (regname, "vscr") == 0)) |
| 227 | return -1; |
| 228 | |
| 229 | TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n", |
| 230 | regno, regname, (long)buf)); |
| 231 | psim_write_register(simulator, MAX_NR_PROCESSORS, |
| 232 | buf, regname, raw_transfer); |
| 233 | return -1; |
| 234 | } |
| 235 | |
| 236 | |
| 237 | void |
| 238 | sim_info (SIM_DESC sd, int verbose) |
| 239 | { |
| 240 | TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose)); |
| 241 | psim_print_info (simulator, verbose); |
| 242 | } |
| 243 | |
| 244 | |
| 245 | SIM_RC |
| 246 | sim_create_inferior (SIM_DESC sd, |
| 247 | struct _bfd *abfd, |
| 248 | char **argv, |
| 249 | char **envp) |
| 250 | { |
| 251 | unsigned_word entry_point; |
| 252 | TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n", |
| 253 | entry_point)); |
| 254 | |
| 255 | if (simulator == NULL) |
| 256 | error ("No program loaded"); |
| 257 | |
| 258 | if (abfd != NULL) |
| 259 | entry_point = bfd_get_start_address (abfd); |
| 260 | else |
| 261 | entry_point = 0xfff00000; /* ??? */ |
| 262 | |
| 263 | psim_init(simulator); |
| 264 | psim_stack(simulator, argv, envp); |
| 265 | |
| 266 | psim_write_register(simulator, -1 /* all start at same PC */, |
| 267 | &entry_point, "pc", cooked_transfer); |
| 268 | return SIM_RC_OK; |
| 269 | } |
| 270 | |
| 271 | |
| 272 | void |
| 273 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc) |
| 274 | { |
| 275 | psim_status status = psim_get_status(simulator); |
| 276 | |
| 277 | switch (status.reason) { |
| 278 | case was_continuing: |
| 279 | *reason = sim_stopped; |
| 280 | if (status.signal == 0) |
| 281 | *sigrc = SIGTRAP; |
| 282 | else |
| 283 | *sigrc = status.signal; |
| 284 | break; |
| 285 | case was_trap: |
| 286 | *reason = sim_stopped; |
| 287 | *sigrc = SIGTRAP; |
| 288 | break; |
| 289 | case was_exited: |
| 290 | *reason = sim_exited; |
| 291 | *sigrc = status.signal; |
| 292 | break; |
| 293 | case was_signalled: |
| 294 | *reason = sim_signalled; |
| 295 | *sigrc = status.signal; |
| 296 | break; |
| 297 | } |
| 298 | |
| 299 | TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n", |
| 300 | (long)reason, (long)*reason, (long)sigrc, (long)*sigrc)); |
| 301 | } |
| 302 | |
| 303 | |
| 304 | |
| 305 | /* Run (or resume) the program. */ |
| 306 | |
| 307 | int |
| 308 | sim_stop (SIM_DESC sd) |
| 309 | { |
| 310 | psim_stop (simulator); |
| 311 | return 1; |
| 312 | } |
| 313 | |
| 314 | void |
| 315 | sim_resume (SIM_DESC sd, int step, int siggnal) |
| 316 | { |
| 317 | TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n", |
| 318 | step, siggnal)); |
| 319 | |
| 320 | if (step) |
| 321 | { |
| 322 | psim_step (simulator); |
| 323 | } |
| 324 | else |
| 325 | { |
| 326 | psim_run (simulator); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | void |
| 331 | sim_do_command (SIM_DESC sd, char *cmd) |
| 332 | { |
| 333 | TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n", |
| 334 | cmd ? cmd : "(null)")); |
| 335 | if (cmd != NULL) { |
| 336 | char **argv = buildargv(cmd); |
| 337 | psim_command(root_device, argv); |
| 338 | freeargv(argv); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | |
| 343 | /* Polling, if required */ |
| 344 | |
| 345 | void |
| 346 | sim_io_poll_quit (void) |
| 347 | { |
| 348 | if (callbacks->poll_quit != NULL && poll_quit_count-- < 0) |
| 349 | { |
| 350 | poll_quit_count = POLL_QUIT_INTERVAL; |
| 351 | if (callbacks->poll_quit (callbacks)) |
| 352 | psim_stop (simulator); |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | |
| 357 | |
| 358 | /* Map simulator IO operations onto the corresponding GDB I/O |
| 359 | functions. |
| 360 | |
| 361 | NB: Only a limited subset of operations are mapped across. More |
| 362 | advanced operations (such as dup or write) must either be mapped to |
| 363 | one of the below calls or handled internally */ |
| 364 | |
| 365 | int |
| 366 | sim_io_read_stdin(char *buf, |
| 367 | int sizeof_buf) |
| 368 | { |
| 369 | switch (CURRENT_STDIO) { |
| 370 | case DO_USE_STDIO: |
| 371 | return callbacks->read_stdin(callbacks, buf, sizeof_buf); |
| 372 | break; |
| 373 | case DONT_USE_STDIO: |
| 374 | return callbacks->read(callbacks, 0, buf, sizeof_buf); |
| 375 | break; |
| 376 | default: |
| 377 | error("sim_io_read_stdin: unaccounted switch\n"); |
| 378 | break; |
| 379 | } |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | int |
| 384 | sim_io_write_stdout(const char *buf, |
| 385 | int sizeof_buf) |
| 386 | { |
| 387 | switch (CURRENT_STDIO) { |
| 388 | case DO_USE_STDIO: |
| 389 | return callbacks->write_stdout(callbacks, buf, sizeof_buf); |
| 390 | break; |
| 391 | case DONT_USE_STDIO: |
| 392 | return callbacks->write(callbacks, 1, buf, sizeof_buf); |
| 393 | break; |
| 394 | default: |
| 395 | error("sim_io_write_stdout: unaccounted switch\n"); |
| 396 | break; |
| 397 | } |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | int |
| 402 | sim_io_write_stderr(const char *buf, |
| 403 | int sizeof_buf) |
| 404 | { |
| 405 | switch (CURRENT_STDIO) { |
| 406 | case DO_USE_STDIO: |
| 407 | /* NB: I think there should be an explicit write_stderr callback */ |
| 408 | return callbacks->write(callbacks, 3, buf, sizeof_buf); |
| 409 | break; |
| 410 | case DONT_USE_STDIO: |
| 411 | return callbacks->write(callbacks, 3, buf, sizeof_buf); |
| 412 | break; |
| 413 | default: |
| 414 | error("sim_io_write_stderr: unaccounted switch\n"); |
| 415 | break; |
| 416 | } |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | |
| 421 | void |
| 422 | sim_io_printf_filtered(const char *fmt, |
| 423 | ...) |
| 424 | { |
| 425 | char message[1024]; |
| 426 | va_list ap; |
| 427 | /* format the message */ |
| 428 | va_start(ap, fmt); |
| 429 | vsprintf(message, fmt, ap); |
| 430 | va_end(ap); |
| 431 | /* sanity check */ |
| 432 | if (strlen(message) >= sizeof(message)) |
| 433 | error("sim_io_printf_filtered: buffer overflow\n"); |
| 434 | callbacks->printf_filtered(callbacks, "%s", message); |
| 435 | } |
| 436 | |
| 437 | void |
| 438 | sim_io_flush_stdoutput(void) |
| 439 | { |
| 440 | switch (CURRENT_STDIO) { |
| 441 | case DO_USE_STDIO: |
| 442 | callbacks->flush_stdout (callbacks); |
| 443 | break; |
| 444 | case DONT_USE_STDIO: |
| 445 | break; |
| 446 | default: |
| 447 | error("sim_io_read_stdin: unaccounted switch\n"); |
| 448 | break; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | void |
| 453 | sim_io_error (SIM_DESC sd, const char *fmt, ...) |
| 454 | { |
| 455 | va_list ap; |
| 456 | va_start(ap, fmt); |
| 457 | callbacks->evprintf_filtered (callbacks, fmt, ap); |
| 458 | va_end(ap); |
| 459 | callbacks->error (callbacks, ""); |
| 460 | } |
| 461 | |
| 462 | /****/ |
| 463 | |
| 464 | void * |
| 465 | zalloc(long size) |
| 466 | { |
| 467 | void *memory = (void*)xmalloc(size); |
| 468 | if (memory == NULL) |
| 469 | error("xmalloc failed\n"); |
| 470 | memset(memory, 0, size); |
| 471 | return memory; |
| 472 | } |
| 473 | |
| 474 | void zfree(void *data) |
| 475 | { |
| 476 | free(data); |
| 477 | } |