| 1 | /* Generic remote debugging interface for simulators. |
| 2 | Copyright 1993, 1994 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support. |
| 4 | Steve Chamberlain (sac@cygnus.com). |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "wait.h" |
| 25 | #include "value.h" |
| 26 | #include <string.h> |
| 27 | #include <ctype.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <signal.h> |
| 30 | #include <setjmp.h> |
| 31 | #include <errno.h> |
| 32 | #include "terminal.h" |
| 33 | #include "target.h" |
| 34 | #include "gdbcore.h" |
| 35 | #include "remote-sim.h" |
| 36 | #include "remote-utils.h" |
| 37 | |
| 38 | /* Naming convention: |
| 39 | |
| 40 | sim_* are the interface to the simulator (see remote-sim.h). |
| 41 | |
| 42 | gdbsim_* are stuff which is internal to gdb. */ |
| 43 | |
| 44 | /* Forward data declarations */ |
| 45 | extern struct target_ops gdbsim_ops; |
| 46 | |
| 47 | static int program_loaded = 0; |
| 48 | |
| 49 | static void |
| 50 | dump_mem (buf, len) |
| 51 | char *buf; |
| 52 | int len; |
| 53 | { |
| 54 | if (len <= 8) |
| 55 | { |
| 56 | if (len == 8 || len == 4) |
| 57 | { |
| 58 | long l[2]; |
| 59 | memcpy (l, buf, len); |
| 60 | printf_filtered ("\t0x%x", l[0]); |
| 61 | printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]); |
| 62 | } |
| 63 | else |
| 64 | { |
| 65 | int i; |
| 66 | printf_filtered ("\t"); |
| 67 | for (i = 0; i < len; i++) |
| 68 | printf_filtered ("0x%x ", buf[i]); |
| 69 | printf_filtered ("\n"); |
| 70 | } |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static void |
| 75 | gdbsim_fetch_register (regno) |
| 76 | int regno; |
| 77 | { |
| 78 | if (regno == -1) |
| 79 | { |
| 80 | for (regno = 0; regno < NUM_REGS; regno++) |
| 81 | gdbsim_fetch_register (regno); |
| 82 | } |
| 83 | else |
| 84 | { |
| 85 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 86 | |
| 87 | sim_fetch_register (regno, buf); |
| 88 | supply_register (regno, buf); |
| 89 | if (sr_get_debug ()) |
| 90 | { |
| 91 | printf_filtered ("gdbsim_fetch_register: %d", regno); |
| 92 | /* FIXME: We could print something more intelligible. */ |
| 93 | dump_mem (buf, REGISTER_RAW_SIZE (regno)); |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static void |
| 99 | gdbsim_store_register (regno) |
| 100 | int regno; |
| 101 | { |
| 102 | if (regno == -1) |
| 103 | { |
| 104 | for (regno = 0; regno < NUM_REGS; regno++) |
| 105 | gdbsim_store_register (regno); |
| 106 | } |
| 107 | else |
| 108 | { |
| 109 | /* FIXME: Until read_register() returns LONGEST, we have this. */ |
| 110 | char tmp[MAX_REGISTER_RAW_SIZE]; |
| 111 | read_register_gen (regno, tmp); |
| 112 | sim_store_register (regno, tmp); |
| 113 | if (sr_get_debug ()) |
| 114 | { |
| 115 | printf_filtered ("gdbsim_store_register: %d", regno); |
| 116 | /* FIXME: We could print something more intelligible. */ |
| 117 | dump_mem (tmp, REGISTER_RAW_SIZE (regno)); |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* Kill the running program. This may involve closing any open files |
| 123 | and releasing other resources acquired by the simulated program. */ |
| 124 | |
| 125 | static void |
| 126 | gdbsim_kill () |
| 127 | { |
| 128 | if (sr_get_debug ()) |
| 129 | printf_filtered ("gdbsim_kill\n"); |
| 130 | |
| 131 | sim_kill (); /* close fd's, remove mappings */ |
| 132 | inferior_pid = 0; |
| 133 | } |
| 134 | |
| 135 | /* Load an executable file into the target process. This is expected to |
| 136 | not only bring new code into the target process, but also to update |
| 137 | GDB's symbol tables to match. */ |
| 138 | |
| 139 | static void |
| 140 | gdbsim_load (prog, fromtty) |
| 141 | char *prog; |
| 142 | int fromtty; |
| 143 | { |
| 144 | if (sr_get_debug ()) |
| 145 | printf_filtered ("gdbsim_load: prog \"%s\"\n", prog); |
| 146 | |
| 147 | inferior_pid = 0; |
| 148 | |
| 149 | /* This must be done before calling gr_load_image. */ |
| 150 | program_loaded = 1; |
| 151 | |
| 152 | if (sim_load (prog, fromtty) != 0) |
| 153 | gr_load_image (prog, fromtty); |
| 154 | } |
| 155 | |
| 156 | |
| 157 | /* Start an inferior process and set inferior_pid to its pid. |
| 158 | EXEC_FILE is the file to run. |
| 159 | ALLARGS is a string containing the arguments to the program. |
| 160 | ENV is the environment vector to pass. Errors reported with error(). |
| 161 | On VxWorks and various standalone systems, we ignore exec_file. */ |
| 162 | /* This is called not only when we first attach, but also when the |
| 163 | user types "run" after having attached. */ |
| 164 | |
| 165 | static void |
| 166 | gdbsim_create_inferior (exec_file, args, env) |
| 167 | char *exec_file; |
| 168 | char *args; |
| 169 | char **env; |
| 170 | { |
| 171 | int len; |
| 172 | char *arg_buf,**argv; |
| 173 | CORE_ADDR entry_pt; |
| 174 | |
| 175 | if (! program_loaded) |
| 176 | error ("No program loaded."); |
| 177 | |
| 178 | if (sr_get_debug ()) |
| 179 | printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n", |
| 180 | exec_file, args); |
| 181 | |
| 182 | if (exec_file == 0 || exec_bfd == 0) |
| 183 | error ("No exec file specified."); |
| 184 | |
| 185 | entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); |
| 186 | |
| 187 | gdbsim_kill (NULL, NULL); |
| 188 | remove_breakpoints (); |
| 189 | init_wait_for_inferior (); |
| 190 | |
| 191 | len = 5 + strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10; |
| 192 | arg_buf = (char *) alloca (len); |
| 193 | arg_buf[0] = '\0'; |
| 194 | strcat (arg_buf, exec_file); |
| 195 | strcat (arg_buf, " "); |
| 196 | strcat (arg_buf, args); |
| 197 | argv = buildargv (arg_buf); |
| 198 | make_cleanup (freeargv, (char *) argv); |
| 199 | sim_create_inferior (entry_pt, argv, env); |
| 200 | |
| 201 | inferior_pid = 42; |
| 202 | insert_breakpoints (); /* Needed to get correct instruction in cache */ |
| 203 | proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); |
| 204 | } |
| 205 | |
| 206 | /* The open routine takes the rest of the parameters from the command, |
| 207 | and (if successful) pushes a new target onto the stack. |
| 208 | Targets should supply this routine, if only to provide an error message. */ |
| 209 | /* Called when selecting the simulator. EG: (gdb) target sim name. */ |
| 210 | |
| 211 | static void |
| 212 | gdbsim_open (args, from_tty) |
| 213 | char *args; |
| 214 | int from_tty; |
| 215 | { |
| 216 | if (sr_get_debug ()) |
| 217 | printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)"); |
| 218 | |
| 219 | sim_open (args); |
| 220 | |
| 221 | push_target (&gdbsim_ops); |
| 222 | target_fetch_registers (-1); |
| 223 | |
| 224 | printf_filtered ("Connected to the simulator.\n"); |
| 225 | } |
| 226 | |
| 227 | /* Does whatever cleanup is required for a target that we are no longer |
| 228 | going to be calling. Argument says whether we are quitting gdb and |
| 229 | should not get hung in case of errors, or whether we want a clean |
| 230 | termination even if it takes a while. This routine is automatically |
| 231 | always called just before a routine is popped off the target stack. |
| 232 | Closing file descriptors and freeing memory are typical things it should |
| 233 | do. */ |
| 234 | /* Close out all files and local state before this target loses control. */ |
| 235 | |
| 236 | static void |
| 237 | gdbsim_close (quitting) |
| 238 | int quitting; |
| 239 | { |
| 240 | if (sr_get_debug ()) |
| 241 | printf_filtered ("gdbsim_close: quitting %d\n", quitting); |
| 242 | |
| 243 | program_loaded = 0; |
| 244 | |
| 245 | sim_close (quitting); |
| 246 | } |
| 247 | |
| 248 | /* Takes a program previously attached to and detaches it. |
| 249 | The program may resume execution (some targets do, some don't) and will |
| 250 | no longer stop on signals, etc. We better not have left any breakpoints |
| 251 | in the program or it'll die when it hits one. ARGS is arguments |
| 252 | typed by the user (e.g. a signal to send the process). FROM_TTY |
| 253 | says whether to be verbose or not. */ |
| 254 | /* Terminate the open connection to the remote debugger. |
| 255 | Use this when you want to detach and do something else with your gdb. */ |
| 256 | |
| 257 | static void |
| 258 | gdbsim_detach (args,from_tty) |
| 259 | char *args; |
| 260 | int from_tty; |
| 261 | { |
| 262 | if (sr_get_debug ()) |
| 263 | printf_filtered ("gdbsim_detach: args \"%s\"\n", args); |
| 264 | |
| 265 | pop_target (); /* calls gdbsim_close to do the real work */ |
| 266 | if (from_tty) |
| 267 | printf_filtered ("Ending simulator %s debugging\n", target_shortname); |
| 268 | } |
| 269 | |
| 270 | /* Resume execution of the target process. STEP says whether to single-step |
| 271 | or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given |
| 272 | to the target, or zero for no signal. */ |
| 273 | |
| 274 | static void |
| 275 | gdbsim_resume (pid, step, siggnal) |
| 276 | int pid, step; |
| 277 | enum target_signal siggnal; |
| 278 | { |
| 279 | if (sr_get_debug ()) |
| 280 | printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal); |
| 281 | |
| 282 | sim_resume (step, target_signal_to_host (siggnal)); |
| 283 | } |
| 284 | |
| 285 | /* Wait for inferior process to do something. Return pid of child, |
| 286 | or -1 in case of error; store status through argument pointer STATUS, |
| 287 | just as `wait' would. */ |
| 288 | |
| 289 | static int |
| 290 | gdbsim_wait (pid, status) |
| 291 | int pid; |
| 292 | struct target_waitstatus *status; |
| 293 | { |
| 294 | int sigrc; |
| 295 | enum sim_stop reason; |
| 296 | |
| 297 | if (sr_get_debug ()) |
| 298 | printf_filtered ("gdbsim_wait\n"); |
| 299 | |
| 300 | sim_stop_reason (&reason, &sigrc); |
| 301 | switch (reason) |
| 302 | { |
| 303 | case sim_exited: |
| 304 | status->kind = TARGET_WAITKIND_EXITED; |
| 305 | status->value.integer = sigrc; |
| 306 | break; |
| 307 | case sim_stopped: |
| 308 | status->kind = TARGET_WAITKIND_STOPPED; |
| 309 | /* The signal in sigrc is a host signal. That probably |
| 310 | should be fixed. */ |
| 311 | status->value.sig = target_signal_from_host (sigrc); |
| 312 | break; |
| 313 | case sim_signalled: |
| 314 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 315 | /* The signal in sigrc is a host signal. That probably |
| 316 | should be fixed. */ |
| 317 | status->value.sig = target_signal_from_host (sigrc); |
| 318 | break; |
| 319 | } |
| 320 | |
| 321 | return inferior_pid; |
| 322 | } |
| 323 | |
| 324 | /* Get ready to modify the registers array. On machines which store |
| 325 | individual registers, this doesn't need to do anything. On machines |
| 326 | which store all the registers in one fell swoop, this makes sure |
| 327 | that registers contains all the registers from the program being |
| 328 | debugged. */ |
| 329 | |
| 330 | static void |
| 331 | gdbsim_prepare_to_store () |
| 332 | { |
| 333 | /* Do nothing, since we can store individual regs */ |
| 334 | } |
| 335 | |
| 336 | static int |
| 337 | gdbsim_xfer_inferior_memory (memaddr, myaddr, len, write, target) |
| 338 | CORE_ADDR memaddr; |
| 339 | char *myaddr; |
| 340 | int len; |
| 341 | int write; |
| 342 | struct target_ops *target; /* ignored */ |
| 343 | { |
| 344 | if (! program_loaded) |
| 345 | error ("No program loaded."); |
| 346 | |
| 347 | if (sr_get_debug ()) |
| 348 | { |
| 349 | printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n", |
| 350 | myaddr, memaddr, len, write); |
| 351 | if (sr_get_debug () && write) |
| 352 | dump_mem(myaddr, len); |
| 353 | } |
| 354 | |
| 355 | if (write) |
| 356 | { |
| 357 | len = sim_write (memaddr, myaddr, len); |
| 358 | } |
| 359 | else |
| 360 | { |
| 361 | len = sim_read (memaddr, myaddr, len); |
| 362 | if (sr_get_debug () && len > 0) |
| 363 | dump_mem(myaddr, len); |
| 364 | } |
| 365 | return len; |
| 366 | } |
| 367 | |
| 368 | static void |
| 369 | gdbsim_files_info (target) |
| 370 | struct target_ops *target; |
| 371 | { |
| 372 | char *file = "nothing"; |
| 373 | |
| 374 | if (exec_bfd) |
| 375 | file = bfd_get_filename (exec_bfd); |
| 376 | |
| 377 | if (sr_get_debug ()) |
| 378 | printf_filtered ("gdbsim_files_info: file \"%s\"\n", file); |
| 379 | |
| 380 | if (exec_bfd) |
| 381 | { |
| 382 | printf_filtered ("\tAttached to %s running program %s\n", |
| 383 | target_shortname, file); |
| 384 | sim_info (0); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* Clear the simulator's notion of what the break points are. */ |
| 389 | |
| 390 | static void |
| 391 | gdbsim_mourn_inferior () |
| 392 | { |
| 393 | if (sr_get_debug ()) |
| 394 | printf_filtered ("gdbsim_mourn_inferior:\n"); |
| 395 | |
| 396 | remove_breakpoints (); |
| 397 | generic_mourn_inferior (); |
| 398 | } |
| 399 | |
| 400 | /* Put a command string, in args, out to MONITOR. Output from MONITOR |
| 401 | is placed on the users terminal until the prompt is seen. FIXME: We |
| 402 | read the characters ourseleves here cause of a nasty echo. */ |
| 403 | |
| 404 | static void |
| 405 | simulator_command (args, from_tty) |
| 406 | char *args; |
| 407 | int from_tty; |
| 408 | { |
| 409 | sim_do_command (args); |
| 410 | } |
| 411 | |
| 412 | /* Define the target subroutine names */ |
| 413 | |
| 414 | struct target_ops gdbsim_ops = { |
| 415 | "sim", /* to_shortname */ |
| 416 | "simulator", /* to_longname */ |
| 417 | "Use the compiled-in simulator.", /* to_doc */ |
| 418 | gdbsim_open, /* to_open */ |
| 419 | gdbsim_close, /* to_close */ |
| 420 | NULL, /* to_attach */ |
| 421 | gdbsim_detach, /* to_detach */ |
| 422 | gdbsim_resume, /* to_resume */ |
| 423 | gdbsim_wait, /* to_wait */ |
| 424 | gdbsim_fetch_register, /* to_fetch_registers */ |
| 425 | gdbsim_store_register, /* to_store_registers */ |
| 426 | gdbsim_prepare_to_store, /* to_prepare_to_store */ |
| 427 | gdbsim_xfer_inferior_memory, /* to_xfer_memory */ |
| 428 | gdbsim_files_info, /* to_files_info */ |
| 429 | memory_insert_breakpoint, /* to_insert_breakpoint */ |
| 430 | memory_remove_breakpoint, /* to_remove_breakpoint */ |
| 431 | NULL, /* to_terminal_init */ |
| 432 | NULL, /* to_terminal_inferior */ |
| 433 | NULL, /* to_terminal_ours_for_output */ |
| 434 | NULL, /* to_terminal_ours */ |
| 435 | NULL, /* to_terminal_info */ |
| 436 | gdbsim_kill, /* to_kill */ |
| 437 | gdbsim_load, /* to_load */ |
| 438 | NULL, /* to_lookup_symbol */ |
| 439 | gdbsim_create_inferior, /* to_create_inferior */ |
| 440 | gdbsim_mourn_inferior, /* to_mourn_inferior */ |
| 441 | 0, /* to_can_run */ |
| 442 | 0, /* to_notice_signals */ |
| 443 | 0, /* to_thread_alive */ |
| 444 | 0, /* to_stop */ |
| 445 | process_stratum, /* to_stratum */ |
| 446 | NULL, /* to_next */ |
| 447 | 1, /* to_has_all_memory */ |
| 448 | 1, /* to_has_memory */ |
| 449 | 1, /* to_has_stack */ |
| 450 | 1, /* to_has_registers */ |
| 451 | 1, /* to_has_execution */ |
| 452 | NULL, /* sections */ |
| 453 | NULL, /* sections_end */ |
| 454 | OPS_MAGIC, /* to_magic */ |
| 455 | }; |
| 456 | |
| 457 | void |
| 458 | _initialize_remote_sim () |
| 459 | { |
| 460 | add_target (&gdbsim_ops); |
| 461 | |
| 462 | add_com ("sim <command>", class_obscure, simulator_command, |
| 463 | "Send a command to the simulator."); |
| 464 | } |