| 1 | /* Ada Ravenscar thread support. |
| 2 | |
| 3 | Copyright (C) 2004-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 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 | #include "defs.h" |
| 21 | #include "gdbcore.h" |
| 22 | #include "gdbthread.h" |
| 23 | #include "ada-lang.h" |
| 24 | #include "target.h" |
| 25 | #include "inferior.h" |
| 26 | #include "command.h" |
| 27 | #include "ravenscar-thread.h" |
| 28 | #include "observable.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "top.h" |
| 31 | #include "regcache.h" |
| 32 | #include "objfiles.h" |
| 33 | |
| 34 | /* This module provides support for "Ravenscar" tasks (Ada) when |
| 35 | debugging on bare-metal targets. |
| 36 | |
| 37 | The typical situation is when debugging a bare-metal target over |
| 38 | the remote protocol. In that situation, the system does not know |
| 39 | about high-level comcepts such as threads, only about some code |
| 40 | running on one or more CPUs. And since the remote protocol does not |
| 41 | provide any handling for CPUs, the de facto standard for handling |
| 42 | them is to have one thread per CPU, where the thread's ptid has |
| 43 | its lwp field set to the CPU number (eg: 1 for the first CPU, |
| 44 | 2 for the second one, etc). This module will make that assumption. |
| 45 | |
| 46 | This module then creates and maintains the list of threads based |
| 47 | on the list of Ada tasks, with one thread per Ada tasks. The convention |
| 48 | is that threads corresponding to the CPUs (see assumption above) |
| 49 | have a ptid_t of the form (PID, LWP, 0), which threads corresponding |
| 50 | to our Ada tasks have a ptid_t of the form (PID, 0, TID) where TID |
| 51 | is the Ada task's ID as extracted from Ada runtime information. |
| 52 | |
| 53 | Switching to a given Ada tasks (or its underlying thread) is performed |
| 54 | by fetching the registers of that tasks from the memory area where |
| 55 | the registers were saved. For any of the other operations, the |
| 56 | operation is performed by first finding the CPU on which the task |
| 57 | is running, switching to its corresponding ptid, and then performing |
| 58 | the operation on that ptid using the target beneath us. */ |
| 59 | |
| 60 | /* If non-null, ravenscar task support is enabled. */ |
| 61 | static int ravenscar_task_support = 1; |
| 62 | |
| 63 | /* PTID of the last thread that received an event. |
| 64 | This can be useful to determine the associated task that received |
| 65 | the event, to make it the current task. */ |
| 66 | static ptid_t base_ptid; |
| 67 | |
| 68 | static const char running_thread_name[] = "__gnat_running_thread_table"; |
| 69 | |
| 70 | static const char known_tasks_name[] = "system__tasking__debug__known_tasks"; |
| 71 | static const char first_task_name[] = "system__tasking__debug__first_task"; |
| 72 | |
| 73 | static const char ravenscar_runtime_initializer[] = |
| 74 | "system__bb__threads__initialize"; |
| 75 | |
| 76 | static const target_info ravenscar_target_info = { |
| 77 | "ravenscar", |
| 78 | N_("Ravenscar tasks."), |
| 79 | N_("Ravenscar tasks support.") |
| 80 | }; |
| 81 | |
| 82 | struct ravenscar_thread_target final : public target_ops |
| 83 | { |
| 84 | ravenscar_thread_target () |
| 85 | { to_stratum = thread_stratum; } |
| 86 | |
| 87 | const target_info &info () const override |
| 88 | { return ravenscar_target_info; } |
| 89 | |
| 90 | ptid_t wait (ptid_t, struct target_waitstatus *, int) override; |
| 91 | void resume (ptid_t, int, enum gdb_signal) override; |
| 92 | |
| 93 | void fetch_registers (struct regcache *, int) override; |
| 94 | void store_registers (struct regcache *, int) override; |
| 95 | |
| 96 | void prepare_to_store (struct regcache *) override; |
| 97 | |
| 98 | bool stopped_by_sw_breakpoint () override; |
| 99 | |
| 100 | bool stopped_by_hw_breakpoint () override; |
| 101 | |
| 102 | bool stopped_by_watchpoint () override; |
| 103 | |
| 104 | bool stopped_data_address (CORE_ADDR *) override; |
| 105 | |
| 106 | bool thread_alive (ptid_t ptid) override; |
| 107 | |
| 108 | int core_of_thread (ptid_t ptid) override; |
| 109 | |
| 110 | void update_thread_list () override; |
| 111 | |
| 112 | const char *extra_thread_info (struct thread_info *) override; |
| 113 | |
| 114 | const char *pid_to_str (ptid_t) override; |
| 115 | |
| 116 | ptid_t get_ada_task_ptid (long lwp, long thread) override; |
| 117 | |
| 118 | void mourn_inferior () override; |
| 119 | |
| 120 | bool has_all_memory () override { return default_child_has_all_memory (); } |
| 121 | bool has_memory () override { return default_child_has_memory (); } |
| 122 | bool has_stack () override { return default_child_has_stack (); } |
| 123 | bool has_registers () override { return default_child_has_registers (); } |
| 124 | bool has_execution (ptid_t ptid) override |
| 125 | { return default_child_has_execution (ptid); } |
| 126 | }; |
| 127 | |
| 128 | /* This module's target-specific operations. */ |
| 129 | static ravenscar_thread_target ravenscar_ops; |
| 130 | |
| 131 | static ptid_t ravenscar_active_task (int cpu); |
| 132 | static void ravenscar_update_inferior_ptid (void); |
| 133 | static int has_ravenscar_runtime (void); |
| 134 | static int ravenscar_runtime_initialized (void); |
| 135 | static void ravenscar_inferior_created (struct target_ops *target, |
| 136 | int from_tty); |
| 137 | |
| 138 | /* Return nonzero iff PTID corresponds to a ravenscar task. */ |
| 139 | |
| 140 | static int |
| 141 | is_ravenscar_task (ptid_t ptid) |
| 142 | { |
| 143 | /* By construction, ravenscar tasks have their LWP set to zero. |
| 144 | Also make sure that the TID is nonzero, as some remotes, when |
| 145 | asked for the list of threads, will return the first thread |
| 146 | as having its TID set to zero. For instance, TSIM version |
| 147 | 2.0.48 for LEON3 sends 'm0' as a reply to the 'qfThreadInfo' |
| 148 | query, which the remote protocol layer then treats as a thread |
| 149 | whose TID is 0. This is obviously not a ravenscar task. */ |
| 150 | return ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) != 0; |
| 151 | } |
| 152 | |
| 153 | /* Given PTID, which can be either a ravenscar task or a CPU thread, |
| 154 | return which CPU that ptid is running on. |
| 155 | |
| 156 | This assume that PTID is a valid ptid_t. Otherwise, a gdb_assert |
| 157 | will be triggered. */ |
| 158 | |
| 159 | static int |
| 160 | ravenscar_get_thread_base_cpu (ptid_t ptid) |
| 161 | { |
| 162 | int base_cpu; |
| 163 | |
| 164 | if (is_ravenscar_task (ptid)) |
| 165 | { |
| 166 | struct ada_task_info *task_info = ada_get_task_info_from_ptid (ptid); |
| 167 | |
| 168 | gdb_assert (task_info != NULL); |
| 169 | base_cpu = task_info->base_cpu; |
| 170 | } |
| 171 | else |
| 172 | { |
| 173 | /* We assume that the LWP of the PTID is equal to the CPU number. */ |
| 174 | base_cpu = ptid_get_lwp (ptid); |
| 175 | } |
| 176 | |
| 177 | return base_cpu; |
| 178 | } |
| 179 | |
| 180 | /* Given a ravenscar task (identified by its ptid_t PTID), return nonzero |
| 181 | if this task is the currently active task on the cpu that task is |
| 182 | running on. |
| 183 | |
| 184 | In other words, this function determine which CPU this task is |
| 185 | currently running on, and then return nonzero if the CPU in question |
| 186 | is executing the code for that task. If that's the case, then |
| 187 | that task's registers are in the CPU bank. Otherwise, the task |
| 188 | is currently suspended, and its registers have been saved in memory. */ |
| 189 | |
| 190 | static int |
| 191 | ravenscar_task_is_currently_active (ptid_t ptid) |
| 192 | { |
| 193 | ptid_t active_task_ptid |
| 194 | = ravenscar_active_task (ravenscar_get_thread_base_cpu (ptid)); |
| 195 | |
| 196 | return ptid_equal (ptid, active_task_ptid); |
| 197 | } |
| 198 | |
| 199 | /* Return the CPU thread (as a ptid_t) on which the given ravenscar |
| 200 | task is running. |
| 201 | |
| 202 | This is the thread that corresponds to the CPU on which the task |
| 203 | is running. */ |
| 204 | |
| 205 | static ptid_t |
| 206 | get_base_thread_from_ravenscar_task (ptid_t ptid) |
| 207 | { |
| 208 | int base_cpu; |
| 209 | |
| 210 | if (!is_ravenscar_task (ptid)) |
| 211 | return ptid; |
| 212 | |
| 213 | base_cpu = ravenscar_get_thread_base_cpu (ptid); |
| 214 | return ptid_build (ptid_get_pid (ptid), base_cpu, 0); |
| 215 | } |
| 216 | |
| 217 | /* Fetch the ravenscar running thread from target memory and |
| 218 | update inferior_ptid accordingly. */ |
| 219 | |
| 220 | static void |
| 221 | ravenscar_update_inferior_ptid (void) |
| 222 | { |
| 223 | int base_cpu; |
| 224 | |
| 225 | base_ptid = inferior_ptid; |
| 226 | |
| 227 | gdb_assert (!is_ravenscar_task (inferior_ptid)); |
| 228 | base_cpu = ravenscar_get_thread_base_cpu (base_ptid); |
| 229 | |
| 230 | /* If the runtime has not been initialized yet, the inferior_ptid is |
| 231 | the only ptid that there is. */ |
| 232 | if (!ravenscar_runtime_initialized ()) |
| 233 | return; |
| 234 | |
| 235 | /* Make sure we set base_ptid before calling ravenscar_active_task |
| 236 | as the latter relies on it. */ |
| 237 | inferior_ptid = ravenscar_active_task (base_cpu); |
| 238 | gdb_assert (!ptid_equal (inferior_ptid, null_ptid)); |
| 239 | |
| 240 | /* The running thread may not have been added to |
| 241 | system.tasking.debug's list yet; so ravenscar_update_thread_list |
| 242 | may not always add it to the thread list. Add it here. */ |
| 243 | if (!find_thread_ptid (inferior_ptid)) |
| 244 | add_thread (inferior_ptid); |
| 245 | } |
| 246 | |
| 247 | /* The Ravenscar Runtime exports a symbol which contains the ID of |
| 248 | the thread that is currently running. Try to locate that symbol |
| 249 | and return its associated minimal symbol. |
| 250 | Return NULL if not found. */ |
| 251 | |
| 252 | static struct bound_minimal_symbol |
| 253 | get_running_thread_msymbol (void) |
| 254 | { |
| 255 | struct bound_minimal_symbol msym; |
| 256 | |
| 257 | msym = lookup_minimal_symbol (running_thread_name, NULL, NULL); |
| 258 | if (!msym.minsym) |
| 259 | /* Older versions of the GNAT runtime were using a different |
| 260 | (less ideal) name for the symbol where the active thread ID |
| 261 | is stored. If we couldn't find the symbol using the latest |
| 262 | name, then try the old one. */ |
| 263 | msym = lookup_minimal_symbol ("running_thread", NULL, NULL); |
| 264 | |
| 265 | return msym; |
| 266 | } |
| 267 | |
| 268 | /* Return True if the Ada Ravenscar run-time can be found in the |
| 269 | application. */ |
| 270 | |
| 271 | static int |
| 272 | has_ravenscar_runtime (void) |
| 273 | { |
| 274 | struct bound_minimal_symbol msym_ravenscar_runtime_initializer = |
| 275 | lookup_minimal_symbol (ravenscar_runtime_initializer, NULL, NULL); |
| 276 | struct bound_minimal_symbol msym_known_tasks = |
| 277 | lookup_minimal_symbol (known_tasks_name, NULL, NULL); |
| 278 | struct bound_minimal_symbol msym_first_task = |
| 279 | lookup_minimal_symbol (first_task_name, NULL, NULL); |
| 280 | struct bound_minimal_symbol msym_running_thread |
| 281 | = get_running_thread_msymbol (); |
| 282 | |
| 283 | return (msym_ravenscar_runtime_initializer.minsym |
| 284 | && (msym_known_tasks.minsym || msym_first_task.minsym) |
| 285 | && msym_running_thread.minsym); |
| 286 | } |
| 287 | |
| 288 | /* Return True if the Ada Ravenscar run-time can be found in the |
| 289 | application, and if it has been initialized on target. */ |
| 290 | |
| 291 | static int |
| 292 | ravenscar_runtime_initialized (void) |
| 293 | { |
| 294 | return (!(ptid_equal (ravenscar_active_task (1), null_ptid))); |
| 295 | } |
| 296 | |
| 297 | /* Return the ID of the thread that is currently running. |
| 298 | Return 0 if the ID could not be determined. */ |
| 299 | |
| 300 | static CORE_ADDR |
| 301 | get_running_thread_id (int cpu) |
| 302 | { |
| 303 | struct bound_minimal_symbol object_msym = get_running_thread_msymbol (); |
| 304 | int object_size; |
| 305 | int buf_size; |
| 306 | gdb_byte *buf; |
| 307 | CORE_ADDR object_addr; |
| 308 | struct type *builtin_type_void_data_ptr = |
| 309 | builtin_type (target_gdbarch ())->builtin_data_ptr; |
| 310 | |
| 311 | if (!object_msym.minsym) |
| 312 | return 0; |
| 313 | |
| 314 | object_size = TYPE_LENGTH (builtin_type_void_data_ptr); |
| 315 | object_addr = (BMSYMBOL_VALUE_ADDRESS (object_msym) |
| 316 | + (cpu - 1) * object_size); |
| 317 | buf_size = object_size; |
| 318 | buf = (gdb_byte *) alloca (buf_size); |
| 319 | read_memory (object_addr, buf, buf_size); |
| 320 | return extract_typed_address (buf, builtin_type_void_data_ptr); |
| 321 | } |
| 322 | |
| 323 | void |
| 324 | ravenscar_thread_target::resume (ptid_t ptid, int step, enum gdb_signal siggnal) |
| 325 | { |
| 326 | struct target_ops *beneath = find_target_beneath (this); |
| 327 | |
| 328 | inferior_ptid = base_ptid; |
| 329 | beneath->resume (base_ptid, step, siggnal); |
| 330 | } |
| 331 | |
| 332 | ptid_t |
| 333 | ravenscar_thread_target::wait (ptid_t ptid, |
| 334 | struct target_waitstatus *status, |
| 335 | int options) |
| 336 | { |
| 337 | struct target_ops *beneath = find_target_beneath (this); |
| 338 | ptid_t event_ptid; |
| 339 | |
| 340 | inferior_ptid = base_ptid; |
| 341 | event_ptid = beneath->wait (base_ptid, status, 0); |
| 342 | /* Find any new threads that might have been created, and update |
| 343 | inferior_ptid to the active thread. |
| 344 | |
| 345 | Only do it if the program is still alive, though. Otherwise, |
| 346 | this causes problems when debugging through the remote protocol, |
| 347 | because we might try switching threads (and thus sending packets) |
| 348 | after the remote has disconnected. */ |
| 349 | if (status->kind != TARGET_WAITKIND_EXITED |
| 350 | && status->kind != TARGET_WAITKIND_SIGNALLED) |
| 351 | { |
| 352 | inferior_ptid = event_ptid; |
| 353 | this->update_thread_list (); |
| 354 | ravenscar_update_inferior_ptid (); |
| 355 | } |
| 356 | return inferior_ptid; |
| 357 | } |
| 358 | |
| 359 | /* Add the thread associated to the given TASK to the thread list |
| 360 | (if the thread has already been added, this is a no-op). */ |
| 361 | |
| 362 | static void |
| 363 | ravenscar_add_thread (struct ada_task_info *task) |
| 364 | { |
| 365 | if (find_thread_ptid (task->ptid) == NULL) |
| 366 | add_thread (task->ptid); |
| 367 | } |
| 368 | |
| 369 | void |
| 370 | ravenscar_thread_target::update_thread_list () |
| 371 | { |
| 372 | ada_build_task_list (); |
| 373 | |
| 374 | /* Do not clear the thread list before adding the Ada task, to keep |
| 375 | the thread that the process stratum has included into it |
| 376 | (base_ptid) and the running thread, that may not have been included |
| 377 | to system.tasking.debug's list yet. */ |
| 378 | |
| 379 | iterate_over_live_ada_tasks (ravenscar_add_thread); |
| 380 | } |
| 381 | |
| 382 | static ptid_t |
| 383 | ravenscar_active_task (int cpu) |
| 384 | { |
| 385 | CORE_ADDR tid = get_running_thread_id (cpu); |
| 386 | |
| 387 | if (tid == 0) |
| 388 | return null_ptid; |
| 389 | else |
| 390 | return ptid_build (ptid_get_pid (base_ptid), 0, tid); |
| 391 | } |
| 392 | |
| 393 | const char * |
| 394 | ravenscar_thread_target::extra_thread_info (thread_info *tp) |
| 395 | { |
| 396 | return "Ravenscar task"; |
| 397 | } |
| 398 | |
| 399 | bool |
| 400 | ravenscar_thread_target::thread_alive (ptid_t ptid) |
| 401 | { |
| 402 | /* Ravenscar tasks are non-terminating. */ |
| 403 | return true; |
| 404 | } |
| 405 | |
| 406 | const char * |
| 407 | ravenscar_thread_target::pid_to_str (ptid_t ptid) |
| 408 | { |
| 409 | static char buf[30]; |
| 410 | |
| 411 | snprintf (buf, sizeof (buf), "Thread %#x", (int) ptid_get_tid (ptid)); |
| 412 | return buf; |
| 413 | } |
| 414 | |
| 415 | void |
| 416 | ravenscar_thread_target::fetch_registers (struct regcache *regcache, int regnum) |
| 417 | { |
| 418 | struct target_ops *beneath = find_target_beneath (this); |
| 419 | ptid_t ptid = regcache_get_ptid (regcache); |
| 420 | |
| 421 | if (ravenscar_runtime_initialized () |
| 422 | && is_ravenscar_task (ptid) |
| 423 | && !ravenscar_task_is_currently_active (ptid)) |
| 424 | { |
| 425 | struct gdbarch *gdbarch = regcache->arch (); |
| 426 | struct ravenscar_arch_ops *arch_ops |
| 427 | = gdbarch_ravenscar_ops (gdbarch); |
| 428 | |
| 429 | arch_ops->to_fetch_registers (regcache, regnum); |
| 430 | } |
| 431 | else |
| 432 | beneath->fetch_registers (regcache, regnum); |
| 433 | } |
| 434 | |
| 435 | void |
| 436 | ravenscar_thread_target::store_registers (struct regcache *regcache, |
| 437 | int regnum) |
| 438 | { |
| 439 | target_ops *beneath = find_target_beneath (this); |
| 440 | ptid_t ptid = regcache_get_ptid (regcache); |
| 441 | |
| 442 | if (ravenscar_runtime_initialized () |
| 443 | && is_ravenscar_task (ptid) |
| 444 | && !ravenscar_task_is_currently_active (ptid)) |
| 445 | { |
| 446 | struct gdbarch *gdbarch = regcache->arch (); |
| 447 | struct ravenscar_arch_ops *arch_ops |
| 448 | = gdbarch_ravenscar_ops (gdbarch); |
| 449 | |
| 450 | beneath->store_registers (regcache, regnum); |
| 451 | } |
| 452 | else |
| 453 | beneath->store_registers (regcache, regnum); |
| 454 | } |
| 455 | |
| 456 | void |
| 457 | ravenscar_thread_target::prepare_to_store (struct regcache *regcache) |
| 458 | { |
| 459 | target_ops *beneath = find_target_beneath (this); |
| 460 | ptid_t ptid = regcache_get_ptid (regcache); |
| 461 | |
| 462 | if (ravenscar_runtime_initialized () |
| 463 | && is_ravenscar_task (ptid) |
| 464 | && !ravenscar_task_is_currently_active (ptid)) |
| 465 | { |
| 466 | struct gdbarch *gdbarch = regcache->arch (); |
| 467 | struct ravenscar_arch_ops *arch_ops |
| 468 | = gdbarch_ravenscar_ops (gdbarch); |
| 469 | |
| 470 | beneath->prepare_to_store (regcache); |
| 471 | } |
| 472 | else |
| 473 | beneath->prepare_to_store (regcache); |
| 474 | } |
| 475 | |
| 476 | /* Implement the to_stopped_by_sw_breakpoint target_ops "method". */ |
| 477 | |
| 478 | bool |
| 479 | ravenscar_thread_target::stopped_by_sw_breakpoint () |
| 480 | { |
| 481 | ptid_t saved_ptid = inferior_ptid; |
| 482 | struct target_ops *beneath = find_target_beneath (this); |
| 483 | bool result; |
| 484 | |
| 485 | inferior_ptid = get_base_thread_from_ravenscar_task (saved_ptid); |
| 486 | result = beneath->stopped_by_sw_breakpoint (); |
| 487 | inferior_ptid = saved_ptid; |
| 488 | return result; |
| 489 | } |
| 490 | |
| 491 | /* Implement the to_stopped_by_hw_breakpoint target_ops "method". */ |
| 492 | |
| 493 | bool |
| 494 | ravenscar_thread_target::stopped_by_hw_breakpoint () |
| 495 | { |
| 496 | ptid_t saved_ptid = inferior_ptid; |
| 497 | struct target_ops *beneath = find_target_beneath (this); |
| 498 | bool result; |
| 499 | |
| 500 | inferior_ptid = get_base_thread_from_ravenscar_task (saved_ptid); |
| 501 | result = beneath->stopped_by_hw_breakpoint (); |
| 502 | inferior_ptid = saved_ptid; |
| 503 | return result; |
| 504 | } |
| 505 | |
| 506 | /* Implement the to_stopped_by_watchpoint target_ops "method". */ |
| 507 | |
| 508 | bool |
| 509 | ravenscar_thread_target::stopped_by_watchpoint () |
| 510 | { |
| 511 | ptid_t saved_ptid = inferior_ptid; |
| 512 | struct target_ops *beneath = find_target_beneath (this); |
| 513 | bool result; |
| 514 | |
| 515 | inferior_ptid = get_base_thread_from_ravenscar_task (saved_ptid); |
| 516 | result = beneath->stopped_by_watchpoint (); |
| 517 | inferior_ptid = saved_ptid; |
| 518 | return result; |
| 519 | } |
| 520 | |
| 521 | /* Implement the to_stopped_data_address target_ops "method". */ |
| 522 | |
| 523 | bool |
| 524 | ravenscar_thread_target::stopped_data_address (CORE_ADDR *addr_p) |
| 525 | { |
| 526 | ptid_t saved_ptid = inferior_ptid; |
| 527 | struct target_ops *beneath = find_target_beneath (this); |
| 528 | bool result; |
| 529 | |
| 530 | inferior_ptid = get_base_thread_from_ravenscar_task (saved_ptid); |
| 531 | result = beneath->stopped_data_address (addr_p); |
| 532 | inferior_ptid = saved_ptid; |
| 533 | return result; |
| 534 | } |
| 535 | |
| 536 | void |
| 537 | ravenscar_thread_target::mourn_inferior () |
| 538 | { |
| 539 | struct target_ops *beneath = find_target_beneath (this); |
| 540 | |
| 541 | base_ptid = null_ptid; |
| 542 | beneath->mourn_inferior (); |
| 543 | unpush_target (&ravenscar_ops); |
| 544 | } |
| 545 | |
| 546 | /* Implement the to_core_of_thread target_ops "method". */ |
| 547 | |
| 548 | int |
| 549 | ravenscar_thread_target::core_of_thread (ptid_t ptid) |
| 550 | { |
| 551 | ptid_t saved_ptid = inferior_ptid; |
| 552 | struct target_ops *beneath = find_target_beneath (this); |
| 553 | int result; |
| 554 | |
| 555 | inferior_ptid = get_base_thread_from_ravenscar_task (saved_ptid); |
| 556 | result = beneath->core_of_thread (inferior_ptid); |
| 557 | inferior_ptid = saved_ptid; |
| 558 | return result; |
| 559 | } |
| 560 | |
| 561 | /* Observer on inferior_created: push ravenscar thread stratum if needed. */ |
| 562 | |
| 563 | static void |
| 564 | ravenscar_inferior_created (struct target_ops *target, int from_tty) |
| 565 | { |
| 566 | const char *err_msg; |
| 567 | |
| 568 | if (!ravenscar_task_support |
| 569 | || gdbarch_ravenscar_ops (target_gdbarch ()) == NULL |
| 570 | || !has_ravenscar_runtime ()) |
| 571 | return; |
| 572 | |
| 573 | err_msg = ada_get_tcb_types_info (); |
| 574 | if (err_msg != NULL) |
| 575 | { |
| 576 | warning (_("%s. Task/thread support disabled."), err_msg); |
| 577 | return; |
| 578 | } |
| 579 | |
| 580 | ravenscar_update_inferior_ptid (); |
| 581 | push_target (&ravenscar_ops); |
| 582 | } |
| 583 | |
| 584 | ptid_t |
| 585 | ravenscar_thread_target::get_ada_task_ptid (long lwp, long thread) |
| 586 | { |
| 587 | return ptid_build (ptid_get_pid (base_ptid), 0, thread); |
| 588 | } |
| 589 | |
| 590 | /* Command-list for the "set/show ravenscar" prefix command. */ |
| 591 | static struct cmd_list_element *set_ravenscar_list; |
| 592 | static struct cmd_list_element *show_ravenscar_list; |
| 593 | |
| 594 | /* Implement the "set ravenscar" prefix command. */ |
| 595 | |
| 596 | static void |
| 597 | set_ravenscar_command (const char *arg, int from_tty) |
| 598 | { |
| 599 | printf_unfiltered (_(\ |
| 600 | "\"set ravenscar\" must be followed by the name of a setting.\n")); |
| 601 | help_list (set_ravenscar_list, "set ravenscar ", all_commands, gdb_stdout); |
| 602 | } |
| 603 | |
| 604 | /* Implement the "show ravenscar" prefix command. */ |
| 605 | |
| 606 | static void |
| 607 | show_ravenscar_command (const char *args, int from_tty) |
| 608 | { |
| 609 | cmd_show_list (show_ravenscar_list, from_tty, ""); |
| 610 | } |
| 611 | |
| 612 | /* Implement the "show ravenscar task-switching" command. */ |
| 613 | |
| 614 | static void |
| 615 | show_ravenscar_task_switching_command (struct ui_file *file, int from_tty, |
| 616 | struct cmd_list_element *c, |
| 617 | const char *value) |
| 618 | { |
| 619 | if (ravenscar_task_support) |
| 620 | fprintf_filtered (file, _("\ |
| 621 | Support for Ravenscar task/thread switching is enabled\n")); |
| 622 | else |
| 623 | fprintf_filtered (file, _("\ |
| 624 | Support for Ravenscar task/thread switching is disabled\n")); |
| 625 | } |
| 626 | |
| 627 | /* Module startup initialization function, automagically called by |
| 628 | init.c. */ |
| 629 | |
| 630 | void |
| 631 | _initialize_ravenscar (void) |
| 632 | { |
| 633 | base_ptid = null_ptid; |
| 634 | |
| 635 | /* Notice when the inferior is created in order to push the |
| 636 | ravenscar ops if needed. */ |
| 637 | gdb::observers::inferior_created.attach (ravenscar_inferior_created); |
| 638 | |
| 639 | add_prefix_cmd ("ravenscar", no_class, set_ravenscar_command, |
| 640 | _("Prefix command for changing Ravenscar-specific settings"), |
| 641 | &set_ravenscar_list, "set ravenscar ", 0, &setlist); |
| 642 | |
| 643 | add_prefix_cmd ("ravenscar", no_class, show_ravenscar_command, |
| 644 | _("Prefix command for showing Ravenscar-specific settings"), |
| 645 | &show_ravenscar_list, "show ravenscar ", 0, &showlist); |
| 646 | |
| 647 | add_setshow_boolean_cmd ("task-switching", class_obscure, |
| 648 | &ravenscar_task_support, _("\ |
| 649 | Enable or disable support for GNAT Ravenscar tasks"), _("\ |
| 650 | Show whether support for GNAT Ravenscar tasks is enabled"), |
| 651 | _("\ |
| 652 | Enable or disable support for task/thread switching with the GNAT\n\ |
| 653 | Ravenscar run-time library for bareboard configuration."), |
| 654 | NULL, show_ravenscar_task_switching_command, |
| 655 | &set_ravenscar_list, &show_ravenscar_list); |
| 656 | } |