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036b1ba8 JB |
1 | /* Ada Ravenscar thread support. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2004-2020 Free Software Foundation, Inc. |
036b1ba8 JB |
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" | |
76727919 | 28 | #include "observable.h" |
036b1ba8 JB |
29 | #include "gdbcmd.h" |
30 | #include "top.h" | |
31 | #include "regcache.h" | |
77e371c0 | 32 | #include "objfiles.h" |
a8ac85bb | 33 | #include <unordered_map> |
036b1ba8 | 34 | |
9edcc12f JB |
35 | /* This module provides support for "Ravenscar" tasks (Ada) when |
36 | debugging on bare-metal targets. | |
37 | ||
38 | The typical situation is when debugging a bare-metal target over | |
39 | the remote protocol. In that situation, the system does not know | |
e397fd39 | 40 | about high-level concepts such as threads, only about some code |
9edcc12f JB |
41 | running on one or more CPUs. And since the remote protocol does not |
42 | provide any handling for CPUs, the de facto standard for handling | |
43 | them is to have one thread per CPU, where the thread's ptid has | |
44 | its lwp field set to the CPU number (eg: 1 for the first CPU, | |
45 | 2 for the second one, etc). This module will make that assumption. | |
46 | ||
47 | This module then creates and maintains the list of threads based | |
e397fd39 | 48 | on the list of Ada tasks, with one thread per Ada task. The convention |
9edcc12f | 49 | is that threads corresponding to the CPUs (see assumption above) |
e397fd39 | 50 | have a ptid_t of the form (PID, LWP, 0), while threads corresponding |
9edcc12f JB |
51 | to our Ada tasks have a ptid_t of the form (PID, 0, TID) where TID |
52 | is the Ada task's ID as extracted from Ada runtime information. | |
53 | ||
e397fd39 TT |
54 | Switching to a given Ada task (or its underlying thread) is performed |
55 | by fetching the registers of that task from the memory area where | |
9edcc12f JB |
56 | the registers were saved. For any of the other operations, the |
57 | operation is performed by first finding the CPU on which the task | |
58 | is running, switching to its corresponding ptid, and then performing | |
59 | the operation on that ptid using the target beneath us. */ | |
60 | ||
491144b5 CB |
61 | /* If true, ravenscar task support is enabled. */ |
62 | static bool ravenscar_task_support = true; | |
036b1ba8 | 63 | |
7f39f34a | 64 | static const char running_thread_name[] = "__gnat_running_thread_table"; |
036b1ba8 JB |
65 | |
66 | static const char known_tasks_name[] = "system__tasking__debug__known_tasks"; | |
6040a59d | 67 | static const char first_task_name[] = "system__tasking__debug__first_task"; |
036b1ba8 | 68 | |
6cbcc006 TT |
69 | static const char ravenscar_runtime_initializer[] |
70 | = "system__bb__threads__initialize"; | |
036b1ba8 | 71 | |
d9f719f1 PA |
72 | static const target_info ravenscar_target_info = { |
73 | "ravenscar", | |
74 | N_("Ravenscar tasks."), | |
75 | N_("Ravenscar tasks support.") | |
76 | }; | |
77 | ||
f6ac5f3d PA |
78 | struct ravenscar_thread_target final : public target_ops |
79 | { | |
0b790b1e | 80 | ravenscar_thread_target () |
2da4b788 | 81 | : m_base_ptid (inferior_ptid) |
0b790b1e | 82 | { |
0b790b1e TT |
83 | } |
84 | ||
d9f719f1 PA |
85 | const target_info &info () const override |
86 | { return ravenscar_target_info; } | |
f6ac5f3d | 87 | |
66b4deae PA |
88 | strata stratum () const override { return thread_stratum; } |
89 | ||
b60cea74 | 90 | ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override; |
f6ac5f3d PA |
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 | ||
57810aa7 | 98 | bool stopped_by_sw_breakpoint () override; |
f6ac5f3d | 99 | |
57810aa7 | 100 | bool stopped_by_hw_breakpoint () override; |
f6ac5f3d | 101 | |
57810aa7 | 102 | bool stopped_by_watchpoint () override; |
f6ac5f3d | 103 | |
57810aa7 | 104 | bool stopped_data_address (CORE_ADDR *) override; |
f6ac5f3d | 105 | |
2080266b TT |
106 | enum target_xfer_status xfer_partial (enum target_object object, |
107 | const char *annex, | |
108 | gdb_byte *readbuf, | |
109 | const gdb_byte *writebuf, | |
110 | ULONGEST offset, ULONGEST len, | |
111 | ULONGEST *xfered_len) override; | |
112 | ||
57810aa7 | 113 | bool thread_alive (ptid_t ptid) override; |
f6ac5f3d PA |
114 | |
115 | int core_of_thread (ptid_t ptid) override; | |
116 | ||
117 | void update_thread_list () override; | |
118 | ||
a068643d | 119 | std::string pid_to_str (ptid_t) override; |
f6ac5f3d PA |
120 | |
121 | ptid_t get_ada_task_ptid (long lwp, long thread) override; | |
122 | ||
2080266b TT |
123 | struct btrace_target_info *enable_btrace (ptid_t ptid, |
124 | const struct btrace_config *conf) | |
125 | override | |
126 | { | |
127 | ptid = get_base_thread_from_ravenscar_task (ptid); | |
128 | return beneath ()->enable_btrace (ptid, conf); | |
129 | } | |
130 | ||
f6ac5f3d | 131 | void mourn_inferior () override; |
f6ac5f3d | 132 | |
0b790b1e TT |
133 | void close () override |
134 | { | |
135 | delete this; | |
136 | } | |
137 | ||
3d4470e5 TT |
138 | thread_info *add_active_thread (); |
139 | ||
0b790b1e | 140 | private: |
f6ac5f3d | 141 | |
0b790b1e TT |
142 | /* PTID of the last thread that received an event. |
143 | This can be useful to determine the associated task that received | |
144 | the event, to make it the current task. */ | |
2da4b788 | 145 | ptid_t m_base_ptid; |
0b790b1e | 146 | |
0b790b1e TT |
147 | ptid_t active_task (int cpu); |
148 | bool task_is_currently_active (ptid_t ptid); | |
149 | bool runtime_initialized (); | |
a8ac85bb TT |
150 | int get_thread_base_cpu (ptid_t ptid); |
151 | ptid_t get_base_thread_from_ravenscar_task (ptid_t ptid); | |
2080266b | 152 | void add_thread (struct ada_task_info *task); |
a8ac85bb | 153 | |
a52b3ae2 TT |
154 | /* Like switch_to_thread, but uses the base ptid for the thread. */ |
155 | void set_base_thread_from_ravenscar_task (ptid_t ptid) | |
156 | { | |
157 | process_stratum_target *proc_target | |
158 | = as_process_stratum_target (this->beneath ()); | |
159 | ptid_t underlying = get_base_thread_from_ravenscar_task (ptid); | |
160 | switch_to_thread (find_thread_ptid (proc_target, underlying)); | |
161 | } | |
162 | ||
a8ac85bb TT |
163 | /* This maps a TID to the CPU on which it was running. This is |
164 | needed because sometimes the runtime will report an active task | |
165 | that hasn't yet been put on the list of tasks that is read by | |
166 | ada-tasks.c. */ | |
167 | std::unordered_map<long, int> m_cpu_map; | |
0b790b1e | 168 | }; |
036b1ba8 | 169 | |
989f3c58 | 170 | /* Return true iff PTID corresponds to a ravenscar task. */ |
9edcc12f | 171 | |
989f3c58 | 172 | static bool |
9edcc12f JB |
173 | is_ravenscar_task (ptid_t ptid) |
174 | { | |
54aa6c67 JB |
175 | /* By construction, ravenscar tasks have their LWP set to zero. |
176 | Also make sure that the TID is nonzero, as some remotes, when | |
177 | asked for the list of threads, will return the first thread | |
178 | as having its TID set to zero. For instance, TSIM version | |
179 | 2.0.48 for LEON3 sends 'm0' as a reply to the 'qfThreadInfo' | |
180 | query, which the remote protocol layer then treats as a thread | |
181 | whose TID is 0. This is obviously not a ravenscar task. */ | |
cc6bcb54 | 182 | return ptid.lwp () == 0 && ptid.tid () != 0; |
9edcc12f JB |
183 | } |
184 | ||
185 | /* Given PTID, which can be either a ravenscar task or a CPU thread, | |
186 | return which CPU that ptid is running on. | |
187 | ||
188 | This assume that PTID is a valid ptid_t. Otherwise, a gdb_assert | |
189 | will be triggered. */ | |
190 | ||
a8ac85bb TT |
191 | int |
192 | ravenscar_thread_target::get_thread_base_cpu (ptid_t ptid) | |
9edcc12f JB |
193 | { |
194 | int base_cpu; | |
195 | ||
196 | if (is_ravenscar_task (ptid)) | |
197 | { | |
2080266b TT |
198 | /* Prefer to not read inferior memory if possible, to avoid |
199 | reentrancy problems with xfer_partial. */ | |
200 | auto iter = m_cpu_map.find (ptid.tid ()); | |
9edcc12f | 201 | |
2080266b TT |
202 | if (iter != m_cpu_map.end ()) |
203 | base_cpu = iter->second; | |
a8ac85bb TT |
204 | else |
205 | { | |
2080266b | 206 | struct ada_task_info *task_info = ada_get_task_info_from_ptid (ptid); |
a8ac85bb | 207 | |
2080266b TT |
208 | gdb_assert (task_info != NULL); |
209 | base_cpu = task_info->base_cpu; | |
a8ac85bb | 210 | } |
9edcc12f JB |
211 | } |
212 | else | |
213 | { | |
214 | /* We assume that the LWP of the PTID is equal to the CPU number. */ | |
e38504b3 | 215 | base_cpu = ptid.lwp (); |
9edcc12f JB |
216 | } |
217 | ||
218 | return base_cpu; | |
219 | } | |
220 | ||
989f3c58 | 221 | /* Given a ravenscar task (identified by its ptid_t PTID), return true |
9edcc12f JB |
222 | if this task is the currently active task on the cpu that task is |
223 | running on. | |
224 | ||
225 | In other words, this function determine which CPU this task is | |
226 | currently running on, and then return nonzero if the CPU in question | |
227 | is executing the code for that task. If that's the case, then | |
228 | that task's registers are in the CPU bank. Otherwise, the task | |
229 | is currently suspended, and its registers have been saved in memory. */ | |
230 | ||
0b790b1e TT |
231 | bool |
232 | ravenscar_thread_target::task_is_currently_active (ptid_t ptid) | |
9edcc12f | 233 | { |
a8ac85bb | 234 | ptid_t active_task_ptid = active_task (get_thread_base_cpu (ptid)); |
9edcc12f | 235 | |
d7e15655 | 236 | return ptid == active_task_ptid; |
9edcc12f JB |
237 | } |
238 | ||
239 | /* Return the CPU thread (as a ptid_t) on which the given ravenscar | |
240 | task is running. | |
241 | ||
242 | This is the thread that corresponds to the CPU on which the task | |
243 | is running. */ | |
244 | ||
a8ac85bb TT |
245 | ptid_t |
246 | ravenscar_thread_target::get_base_thread_from_ravenscar_task (ptid_t ptid) | |
9edcc12f JB |
247 | { |
248 | int base_cpu; | |
249 | ||
250 | if (!is_ravenscar_task (ptid)) | |
251 | return ptid; | |
252 | ||
a8ac85bb | 253 | base_cpu = get_thread_base_cpu (ptid); |
e99b03dc | 254 | return ptid_t (ptid.pid (), base_cpu, 0); |
9edcc12f JB |
255 | } |
256 | ||
2da4b788 PA |
257 | /* Fetch the ravenscar running thread from target memory, make sure |
258 | there's a corresponding thread in the thread list, and return it. | |
259 | If the runtime is not initialized, return NULL. */ | |
036b1ba8 | 260 | |
2da4b788 PA |
261 | thread_info * |
262 | ravenscar_thread_target::add_active_thread () | |
036b1ba8 | 263 | { |
5b6d1e4f PA |
264 | process_stratum_target *proc_target |
265 | = as_process_stratum_target (this->beneath ()); | |
266 | ||
9edcc12f JB |
267 | int base_cpu; |
268 | ||
2da4b788 | 269 | gdb_assert (!is_ravenscar_task (m_base_ptid)); |
a8ac85bb | 270 | base_cpu = get_thread_base_cpu (m_base_ptid); |
9edcc12f | 271 | |
0b790b1e | 272 | if (!runtime_initialized ()) |
2da4b788 | 273 | return nullptr; |
036b1ba8 | 274 | |
0b790b1e | 275 | /* Make sure we set m_base_ptid before calling active_task |
036b1ba8 | 276 | as the latter relies on it. */ |
2da4b788 PA |
277 | ptid_t active_ptid = active_task (base_cpu); |
278 | gdb_assert (active_ptid != null_ptid); | |
036b1ba8 JB |
279 | |
280 | /* The running thread may not have been added to | |
e8032dde | 281 | system.tasking.debug's list yet; so ravenscar_update_thread_list |
036b1ba8 | 282 | may not always add it to the thread list. Add it here. */ |
2da4b788 PA |
283 | thread_info *active_thr = find_thread_ptid (proc_target, active_ptid); |
284 | if (active_thr == nullptr) | |
a8ac85bb TT |
285 | { |
286 | active_thr = ::add_thread (proc_target, active_ptid); | |
287 | m_cpu_map[active_ptid.tid ()] = base_cpu; | |
288 | } | |
2da4b788 | 289 | return active_thr; |
036b1ba8 JB |
290 | } |
291 | ||
7f39f34a JB |
292 | /* The Ravenscar Runtime exports a symbol which contains the ID of |
293 | the thread that is currently running. Try to locate that symbol | |
294 | and return its associated minimal symbol. | |
295 | Return NULL if not found. */ | |
296 | ||
3b7344d5 | 297 | static struct bound_minimal_symbol |
989f3c58 | 298 | get_running_thread_msymbol () |
7f39f34a | 299 | { |
3b7344d5 | 300 | struct bound_minimal_symbol msym; |
7f39f34a JB |
301 | |
302 | msym = lookup_minimal_symbol (running_thread_name, NULL, NULL); | |
3b7344d5 | 303 | if (!msym.minsym) |
7f39f34a JB |
304 | /* Older versions of the GNAT runtime were using a different |
305 | (less ideal) name for the symbol where the active thread ID | |
306 | is stored. If we couldn't find the symbol using the latest | |
307 | name, then try the old one. */ | |
308 | msym = lookup_minimal_symbol ("running_thread", NULL, NULL); | |
309 | ||
310 | return msym; | |
311 | } | |
312 | ||
036b1ba8 JB |
313 | /* Return True if the Ada Ravenscar run-time can be found in the |
314 | application. */ | |
315 | ||
989f3c58 TT |
316 | static bool |
317 | has_ravenscar_runtime () | |
036b1ba8 | 318 | { |
6cbcc006 TT |
319 | struct bound_minimal_symbol msym_ravenscar_runtime_initializer |
320 | = lookup_minimal_symbol (ravenscar_runtime_initializer, NULL, NULL); | |
321 | struct bound_minimal_symbol msym_known_tasks | |
322 | = lookup_minimal_symbol (known_tasks_name, NULL, NULL); | |
323 | struct bound_minimal_symbol msym_first_task | |
324 | = lookup_minimal_symbol (first_task_name, NULL, NULL); | |
3b7344d5 TT |
325 | struct bound_minimal_symbol msym_running_thread |
326 | = get_running_thread_msymbol (); | |
036b1ba8 | 327 | |
3b7344d5 TT |
328 | return (msym_ravenscar_runtime_initializer.minsym |
329 | && (msym_known_tasks.minsym || msym_first_task.minsym) | |
330 | && msym_running_thread.minsym); | |
036b1ba8 JB |
331 | } |
332 | ||
333 | /* Return True if the Ada Ravenscar run-time can be found in the | |
334 | application, and if it has been initialized on target. */ | |
335 | ||
0b790b1e TT |
336 | bool |
337 | ravenscar_thread_target::runtime_initialized () | |
036b1ba8 | 338 | { |
0b790b1e | 339 | return active_task (1) != null_ptid; |
036b1ba8 JB |
340 | } |
341 | ||
7f39f34a JB |
342 | /* Return the ID of the thread that is currently running. |
343 | Return 0 if the ID could not be determined. */ | |
036b1ba8 JB |
344 | |
345 | static CORE_ADDR | |
9edcc12f | 346 | get_running_thread_id (int cpu) |
036b1ba8 | 347 | { |
3b7344d5 | 348 | struct bound_minimal_symbol object_msym = get_running_thread_msymbol (); |
036b1ba8 JB |
349 | int object_size; |
350 | int buf_size; | |
948f8e3d | 351 | gdb_byte *buf; |
036b1ba8 | 352 | CORE_ADDR object_addr; |
6cbcc006 TT |
353 | struct type *builtin_type_void_data_ptr |
354 | = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
036b1ba8 | 355 | |
3b7344d5 | 356 | if (!object_msym.minsym) |
036b1ba8 JB |
357 | return 0; |
358 | ||
036b1ba8 | 359 | object_size = TYPE_LENGTH (builtin_type_void_data_ptr); |
9edcc12f JB |
360 | object_addr = (BMSYMBOL_VALUE_ADDRESS (object_msym) |
361 | + (cpu - 1) * object_size); | |
036b1ba8 | 362 | buf_size = object_size; |
224c3ddb | 363 | buf = (gdb_byte *) alloca (buf_size); |
036b1ba8 JB |
364 | read_memory (object_addr, buf, buf_size); |
365 | return extract_typed_address (buf, builtin_type_void_data_ptr); | |
366 | } | |
367 | ||
f6ac5f3d | 368 | void |
6cbcc006 TT |
369 | ravenscar_thread_target::resume (ptid_t ptid, int step, |
370 | enum gdb_signal siggnal) | |
036b1ba8 | 371 | { |
485b851b TT |
372 | /* If we see a wildcard resume, we simply pass that on. Otherwise, |
373 | arrange to resume the base ptid. */ | |
0b790b1e | 374 | inferior_ptid = m_base_ptid; |
39e2018a TT |
375 | if (ptid.is_pid ()) |
376 | { | |
377 | /* We only have one process, so resume all threads of it. */ | |
378 | ptid = minus_one_ptid; | |
379 | } | |
380 | else if (ptid != minus_one_ptid) | |
485b851b TT |
381 | ptid = m_base_ptid; |
382 | beneath ()->resume (ptid, step, siggnal); | |
036b1ba8 JB |
383 | } |
384 | ||
f6ac5f3d PA |
385 | ptid_t |
386 | ravenscar_thread_target::wait (ptid_t ptid, | |
387 | struct target_waitstatus *status, | |
b60cea74 | 388 | target_wait_flags options) |
036b1ba8 | 389 | { |
5b6d1e4f PA |
390 | process_stratum_target *beneath |
391 | = as_process_stratum_target (this->beneath ()); | |
3b1b69bf | 392 | ptid_t event_ptid; |
036b1ba8 | 393 | |
485b851b TT |
394 | if (ptid != minus_one_ptid) |
395 | ptid = m_base_ptid; | |
5b6d1e4f | 396 | event_ptid = beneath->wait (ptid, status, 0); |
2da4b788 PA |
397 | /* Find any new threads that might have been created, and return the |
398 | active thread. | |
bed0c243 JB |
399 | |
400 | Only do it if the program is still alive, though. Otherwise, | |
401 | this causes problems when debugging through the remote protocol, | |
402 | because we might try switching threads (and thus sending packets) | |
403 | after the remote has disconnected. */ | |
404 | if (status->kind != TARGET_WAITKIND_EXITED | |
e9546579 TT |
405 | && status->kind != TARGET_WAITKIND_SIGNALLED |
406 | && runtime_initialized ()) | |
bed0c243 | 407 | { |
2da4b788 | 408 | m_base_ptid = event_ptid; |
f6ac5f3d | 409 | this->update_thread_list (); |
2da4b788 | 410 | return this->add_active_thread ()->ptid; |
bed0c243 | 411 | } |
550ab58d | 412 | return event_ptid; |
036b1ba8 JB |
413 | } |
414 | ||
415 | /* Add the thread associated to the given TASK to the thread list | |
416 | (if the thread has already been added, this is a no-op). */ | |
417 | ||
2080266b TT |
418 | void |
419 | ravenscar_thread_target::add_thread (struct ada_task_info *task) | |
036b1ba8 | 420 | { |
5b6d1e4f | 421 | if (find_thread_ptid (current_inferior (), task->ptid) == NULL) |
2080266b TT |
422 | { |
423 | ::add_thread (current_inferior ()->process_target (), task->ptid); | |
424 | m_cpu_map[task->ptid.tid ()] = task->base_cpu; | |
425 | } | |
036b1ba8 JB |
426 | } |
427 | ||
f6ac5f3d PA |
428 | void |
429 | ravenscar_thread_target::update_thread_list () | |
036b1ba8 | 430 | { |
0e29517d TT |
431 | /* iterate_over_live_ada_tasks requires that inferior_ptid be set, |
432 | but this isn't always the case in target methods. So, we ensure | |
433 | it here. */ | |
434 | scoped_restore save_ptid = make_scoped_restore (&inferior_ptid, | |
435 | m_base_ptid); | |
436 | ||
036b1ba8 JB |
437 | /* Do not clear the thread list before adding the Ada task, to keep |
438 | the thread that the process stratum has included into it | |
0b790b1e | 439 | (m_base_ptid) and the running thread, that may not have been included |
036b1ba8 JB |
440 | to system.tasking.debug's list yet. */ |
441 | ||
2080266b TT |
442 | iterate_over_live_ada_tasks ([=] (struct ada_task_info *task) |
443 | { | |
444 | this->add_thread (task); | |
445 | }); | |
036b1ba8 JB |
446 | } |
447 | ||
0b790b1e TT |
448 | ptid_t |
449 | ravenscar_thread_target::active_task (int cpu) | |
036b1ba8 | 450 | { |
9edcc12f | 451 | CORE_ADDR tid = get_running_thread_id (cpu); |
036b1ba8 JB |
452 | |
453 | if (tid == 0) | |
454 | return null_ptid; | |
455 | else | |
0b790b1e | 456 | return ptid_t (m_base_ptid.pid (), 0, tid); |
036b1ba8 JB |
457 | } |
458 | ||
57810aa7 | 459 | bool |
f6ac5f3d | 460 | ravenscar_thread_target::thread_alive (ptid_t ptid) |
036b1ba8 JB |
461 | { |
462 | /* Ravenscar tasks are non-terminating. */ | |
57810aa7 | 463 | return true; |
036b1ba8 JB |
464 | } |
465 | ||
a068643d | 466 | std::string |
f6ac5f3d | 467 | ravenscar_thread_target::pid_to_str (ptid_t ptid) |
036b1ba8 | 468 | { |
d5d833af TT |
469 | if (!is_ravenscar_task (ptid)) |
470 | return beneath ()->pid_to_str (ptid); | |
471 | ||
472 | return string_printf ("Ravenscar Thread %#x", (int) ptid.tid ()); | |
036b1ba8 JB |
473 | } |
474 | ||
592f9bd7 TT |
475 | /* Temporarily set the ptid of a regcache to some other value. When |
476 | this object is destroyed, the regcache's original ptid is | |
477 | restored. */ | |
478 | ||
479 | class temporarily_change_regcache_ptid | |
480 | { | |
481 | public: | |
482 | ||
483 | temporarily_change_regcache_ptid (struct regcache *regcache, ptid_t new_ptid) | |
484 | : m_regcache (regcache), | |
485 | m_save_ptid (regcache->ptid ()) | |
486 | { | |
487 | m_regcache->set_ptid (new_ptid); | |
488 | } | |
489 | ||
490 | ~temporarily_change_regcache_ptid () | |
491 | { | |
492 | m_regcache->set_ptid (m_save_ptid); | |
493 | } | |
494 | ||
495 | private: | |
496 | ||
497 | /* The regcache. */ | |
498 | struct regcache *m_regcache; | |
499 | /* The saved ptid. */ | |
500 | ptid_t m_save_ptid; | |
501 | }; | |
502 | ||
f6ac5f3d PA |
503 | void |
504 | ravenscar_thread_target::fetch_registers (struct regcache *regcache, int regnum) | |
036b1ba8 | 505 | { |
222312d3 | 506 | ptid_t ptid = regcache->ptid (); |
036b1ba8 | 507 | |
592f9bd7 | 508 | if (runtime_initialized () && is_ravenscar_task (ptid)) |
7e35103a | 509 | { |
592f9bd7 TT |
510 | if (task_is_currently_active (ptid)) |
511 | { | |
512 | ptid_t base = get_base_thread_from_ravenscar_task (ptid); | |
513 | temporarily_change_regcache_ptid changer (regcache, base); | |
514 | beneath ()->fetch_registers (regcache, regnum); | |
515 | } | |
516 | else | |
517 | { | |
518 | struct gdbarch *gdbarch = regcache->arch (); | |
519 | struct ravenscar_arch_ops *arch_ops | |
520 | = gdbarch_ravenscar_ops (gdbarch); | |
7e35103a | 521 | |
592f9bd7 TT |
522 | arch_ops->fetch_registers (regcache, regnum); |
523 | } | |
7e35103a | 524 | } |
9edcc12f | 525 | else |
d6ca69cd | 526 | beneath ()->fetch_registers (regcache, regnum); |
036b1ba8 JB |
527 | } |
528 | ||
f6ac5f3d PA |
529 | void |
530 | ravenscar_thread_target::store_registers (struct regcache *regcache, | |
531 | int regnum) | |
036b1ba8 | 532 | { |
222312d3 | 533 | ptid_t ptid = regcache->ptid (); |
036b1ba8 | 534 | |
592f9bd7 | 535 | if (runtime_initialized () && is_ravenscar_task (ptid)) |
7e35103a | 536 | { |
592f9bd7 TT |
537 | if (task_is_currently_active (ptid)) |
538 | { | |
539 | ptid_t base = get_base_thread_from_ravenscar_task (ptid); | |
540 | temporarily_change_regcache_ptid changer (regcache, base); | |
541 | beneath ()->store_registers (regcache, regnum); | |
542 | } | |
543 | else | |
544 | { | |
545 | struct gdbarch *gdbarch = regcache->arch (); | |
546 | struct ravenscar_arch_ops *arch_ops | |
547 | = gdbarch_ravenscar_ops (gdbarch); | |
7e35103a | 548 | |
592f9bd7 TT |
549 | arch_ops->store_registers (regcache, regnum); |
550 | } | |
7e35103a | 551 | } |
9edcc12f | 552 | else |
d6ca69cd | 553 | beneath ()->store_registers (regcache, regnum); |
036b1ba8 JB |
554 | } |
555 | ||
f6ac5f3d PA |
556 | void |
557 | ravenscar_thread_target::prepare_to_store (struct regcache *regcache) | |
036b1ba8 | 558 | { |
222312d3 | 559 | ptid_t ptid = regcache->ptid (); |
036b1ba8 | 560 | |
592f9bd7 | 561 | if (runtime_initialized () && is_ravenscar_task (ptid)) |
7e35103a | 562 | { |
592f9bd7 TT |
563 | if (task_is_currently_active (ptid)) |
564 | { | |
565 | ptid_t base = get_base_thread_from_ravenscar_task (ptid); | |
566 | temporarily_change_regcache_ptid changer (regcache, base); | |
567 | beneath ()->prepare_to_store (regcache); | |
568 | } | |
569 | else | |
570 | { | |
571 | /* Nothing. */ | |
572 | } | |
7e35103a | 573 | } |
9edcc12f | 574 | else |
d6ca69cd | 575 | beneath ()->prepare_to_store (regcache); |
036b1ba8 JB |
576 | } |
577 | ||
e02544b2 JB |
578 | /* Implement the to_stopped_by_sw_breakpoint target_ops "method". */ |
579 | ||
57810aa7 | 580 | bool |
f6ac5f3d | 581 | ravenscar_thread_target::stopped_by_sw_breakpoint () |
e02544b2 | 582 | { |
a52b3ae2 TT |
583 | scoped_restore_current_thread saver; |
584 | set_base_thread_from_ravenscar_task (inferior_ptid); | |
5b6ea500 | 585 | return beneath ()->stopped_by_sw_breakpoint (); |
e02544b2 JB |
586 | } |
587 | ||
588 | /* Implement the to_stopped_by_hw_breakpoint target_ops "method". */ | |
589 | ||
57810aa7 | 590 | bool |
f6ac5f3d | 591 | ravenscar_thread_target::stopped_by_hw_breakpoint () |
e02544b2 | 592 | { |
a52b3ae2 TT |
593 | scoped_restore_current_thread saver; |
594 | set_base_thread_from_ravenscar_task (inferior_ptid); | |
5b6ea500 | 595 | return beneath ()->stopped_by_hw_breakpoint (); |
e02544b2 JB |
596 | } |
597 | ||
598 | /* Implement the to_stopped_by_watchpoint target_ops "method". */ | |
599 | ||
57810aa7 | 600 | bool |
f6ac5f3d | 601 | ravenscar_thread_target::stopped_by_watchpoint () |
e02544b2 | 602 | { |
a52b3ae2 TT |
603 | scoped_restore_current_thread saver; |
604 | set_base_thread_from_ravenscar_task (inferior_ptid); | |
5b6ea500 | 605 | return beneath ()->stopped_by_watchpoint (); |
e02544b2 JB |
606 | } |
607 | ||
608 | /* Implement the to_stopped_data_address target_ops "method". */ | |
609 | ||
57810aa7 | 610 | bool |
f6ac5f3d | 611 | ravenscar_thread_target::stopped_data_address (CORE_ADDR *addr_p) |
e02544b2 | 612 | { |
a52b3ae2 TT |
613 | scoped_restore_current_thread saver; |
614 | set_base_thread_from_ravenscar_task (inferior_ptid); | |
5b6ea500 | 615 | return beneath ()->stopped_data_address (addr_p); |
e02544b2 JB |
616 | } |
617 | ||
f6ac5f3d PA |
618 | void |
619 | ravenscar_thread_target::mourn_inferior () | |
036b1ba8 | 620 | { |
0b790b1e | 621 | m_base_ptid = null_ptid; |
fd9faca8 | 622 | target_ops *beneath = this->beneath (); |
0b790b1e | 623 | unpush_target (this); |
fd9faca8 | 624 | beneath->mourn_inferior (); |
036b1ba8 JB |
625 | } |
626 | ||
e02544b2 JB |
627 | /* Implement the to_core_of_thread target_ops "method". */ |
628 | ||
f6ac5f3d PA |
629 | int |
630 | ravenscar_thread_target::core_of_thread (ptid_t ptid) | |
e02544b2 | 631 | { |
a52b3ae2 TT |
632 | scoped_restore_current_thread saver; |
633 | set_base_thread_from_ravenscar_task (inferior_ptid); | |
5b6ea500 | 634 | return beneath ()->core_of_thread (inferior_ptid); |
e02544b2 JB |
635 | } |
636 | ||
2080266b TT |
637 | /* Implement the target xfer_partial method. */ |
638 | ||
639 | enum target_xfer_status | |
640 | ravenscar_thread_target::xfer_partial (enum target_object object, | |
641 | const char *annex, | |
642 | gdb_byte *readbuf, | |
643 | const gdb_byte *writebuf, | |
644 | ULONGEST offset, ULONGEST len, | |
645 | ULONGEST *xfered_len) | |
646 | { | |
647 | scoped_restore save_ptid = make_scoped_restore (&inferior_ptid); | |
648 | /* Calling get_base_thread_from_ravenscar_task can read memory from | |
649 | the inferior. However, that function is written to prefer our | |
650 | internal map, so it should not result in recursive calls in | |
651 | practice. */ | |
652 | inferior_ptid = get_base_thread_from_ravenscar_task (inferior_ptid); | |
653 | return beneath ()->xfer_partial (object, annex, readbuf, writebuf, | |
654 | offset, len, xfered_len); | |
655 | } | |
656 | ||
036b1ba8 JB |
657 | /* Observer on inferior_created: push ravenscar thread stratum if needed. */ |
658 | ||
659 | static void | |
660 | ravenscar_inferior_created (struct target_ops *target, int from_tty) | |
661 | { | |
cf3fbed4 | 662 | const char *err_msg; |
7e35103a JB |
663 | |
664 | if (!ravenscar_task_support | |
7dc7c195 | 665 | || gdbarch_ravenscar_ops (target_gdbarch ()) == NULL |
7e35103a | 666 | || !has_ravenscar_runtime ()) |
25abf4de JB |
667 | return; |
668 | ||
cf3fbed4 JB |
669 | err_msg = ada_get_tcb_types_info (); |
670 | if (err_msg != NULL) | |
671 | { | |
8f6cb6c3 | 672 | warning (_("%s. Task/thread support disabled."), err_msg); |
cf3fbed4 JB |
673 | return; |
674 | } | |
675 | ||
3d4470e5 TT |
676 | ravenscar_thread_target *rtarget = new ravenscar_thread_target (); |
677 | push_target (target_ops_up (rtarget)); | |
678 | thread_info *thr = rtarget->add_active_thread (); | |
679 | if (thr != nullptr) | |
680 | switch_to_thread (thr); | |
036b1ba8 JB |
681 | } |
682 | ||
f6ac5f3d PA |
683 | ptid_t |
684 | ravenscar_thread_target::get_ada_task_ptid (long lwp, long thread) | |
036b1ba8 | 685 | { |
0b790b1e | 686 | return ptid_t (m_base_ptid.pid (), 0, thread); |
036b1ba8 JB |
687 | } |
688 | ||
036b1ba8 JB |
689 | /* Command-list for the "set/show ravenscar" prefix command. */ |
690 | static struct cmd_list_element *set_ravenscar_list; | |
691 | static struct cmd_list_element *show_ravenscar_list; | |
692 | ||
036b1ba8 JB |
693 | /* Implement the "show ravenscar task-switching" command. */ |
694 | ||
695 | static void | |
696 | show_ravenscar_task_switching_command (struct ui_file *file, int from_tty, | |
697 | struct cmd_list_element *c, | |
698 | const char *value) | |
699 | { | |
700 | if (ravenscar_task_support) | |
701 | fprintf_filtered (file, _("\ | |
b64edec4 | 702 | Support for Ravenscar task/thread switching is enabled\n")); |
036b1ba8 JB |
703 | else |
704 | fprintf_filtered (file, _("\ | |
b64edec4 | 705 | Support for Ravenscar task/thread switching is disabled\n")); |
036b1ba8 JB |
706 | } |
707 | ||
708 | /* Module startup initialization function, automagically called by | |
709 | init.c. */ | |
710 | ||
6c265988 | 711 | void _initialize_ravenscar (); |
036b1ba8 | 712 | void |
989f3c58 | 713 | _initialize_ravenscar () |
036b1ba8 | 714 | { |
036b1ba8 JB |
715 | /* Notice when the inferior is created in order to push the |
716 | ravenscar ops if needed. */ | |
76727919 | 717 | gdb::observers::inferior_created.attach (ravenscar_inferior_created); |
036b1ba8 | 718 | |
0743fc83 TT |
719 | add_basic_prefix_cmd ("ravenscar", no_class, |
720 | _("Prefix command for changing Ravenscar-specific settings."), | |
721 | &set_ravenscar_list, "set ravenscar ", 0, &setlist); | |
036b1ba8 | 722 | |
0743fc83 TT |
723 | add_show_prefix_cmd ("ravenscar", no_class, |
724 | _("Prefix command for showing Ravenscar-specific settings."), | |
725 | &show_ravenscar_list, "show ravenscar ", 0, &showlist); | |
036b1ba8 JB |
726 | |
727 | add_setshow_boolean_cmd ("task-switching", class_obscure, | |
728 | &ravenscar_task_support, _("\ | |
590042fc PW |
729 | Enable or disable support for GNAT Ravenscar tasks."), _("\ |
730 | Show whether support for GNAT Ravenscar tasks is enabled."), | |
036b1ba8 JB |
731 | _("\ |
732 | Enable or disable support for task/thread switching with the GNAT\n\ | |
733 | Ravenscar run-time library for bareboard configuration."), | |
734 | NULL, show_ravenscar_task_switching_command, | |
735 | &set_ravenscar_list, &show_ravenscar_list); | |
736 | } |