1 #include "private/pthread_support.h"
3 # if defined(GC_DARWIN_THREADS)
5 /* From "Inside Mac OS X - Mach-O Runtime Architecture" published by Apple
7 "The space beneath the stack pointer, where a new stack frame would normally
8 be allocated, is called the red zone. This area as shown in Figure 3-2 may
9 be used for any purpose as long as a new stack frame does not need to be
12 Page 50: "If a leaf procedure's red zone usage would exceed 224 bytes, then
13 it must set up a stack frame just like routines that call other routines."
17 # define PPC_RED_ZONE_SIZE 224
18 # elif CPP_WORDSZ == 64
19 # define PPC_RED_ZONE_SIZE 320
23 typedef struct StackFrame {
24 unsigned long savedSP;
25 unsigned long savedCR;
26 unsigned long savedLR;
27 unsigned long reserved[2];
28 unsigned long savedRTOC;
31 unsigned long FindTopOfStack(unsigned int stack_start) {
34 if (stack_start == 0) {
37 __asm__ volatile("lwz %0,0(r1)" : "=r" (frame));
39 __asm__ volatile("ldz %0,0(r1)" : "=r" (frame));
43 frame = (StackFrame *)stack_start;
47 /* GC_printf1("FindTopOfStack start at sp = %p\n", frame); */
50 if (frame->savedSP == 0) break;
51 /* if there are no more stack frames, stop */
53 frame = (StackFrame*)frame->savedSP;
55 /* we do these next two checks after going to the next frame
56 because the LR for the first stack frame in the loop
57 is not set up on purpose, so we shouldn't check it. */
58 if ((frame->savedLR & ~3) == 0) break; /* if the next LR is bogus, stop */
59 if ((~(frame->savedLR) & ~3) == 0) break; /* ditto */
63 /* GC_printf1("FindTopOfStack finish at sp = %p\n", frame); */
66 return (unsigned long)frame;
69 #ifdef DARWIN_DONT_PARSE_STACK
70 void GC_push_all_stacks() {
77 ppc_thread_state_t state;
79 i386_thread_state_t state;
81 # error FIXME for non-x86 || ppc architectures
83 mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
86 if (!GC_thr_initialized) GC_thr_init();
88 for(i=0;i<THREAD_TABLE_SZ;i++) {
89 for(p=GC_threads[i];p!=0;p=p->next) {
90 if(p -> flags & FINISHED) continue;
91 if(pthread_equal(p->id,me)) {
94 /* Get the thread state (registers, etc) */
96 p->stop_info.mach_thread,
100 if(r != KERN_SUCCESS) ABORT("thread_get_state failed");
105 GC_push_one(state.eax);
106 GC_push_one(state.ebx);
107 GC_push_one(state.ecx);
108 GC_push_one(state.edx);
109 GC_push_one(state.edi);
110 GC_push_one(state.esi);
111 GC_push_one(state.ebp);
112 #elif defined(POWERPC)
113 lo = (void*)(state.r1 - PPC_RED_ZONE_SIZE);
115 GC_push_one(state.r0);
116 GC_push_one(state.r2);
117 GC_push_one(state.r3);
118 GC_push_one(state.r4);
119 GC_push_one(state.r5);
120 GC_push_one(state.r6);
121 GC_push_one(state.r7);
122 GC_push_one(state.r8);
123 GC_push_one(state.r9);
124 GC_push_one(state.r10);
125 GC_push_one(state.r11);
126 GC_push_one(state.r12);
127 GC_push_one(state.r13);
128 GC_push_one(state.r14);
129 GC_push_one(state.r15);
130 GC_push_one(state.r16);
131 GC_push_one(state.r17);
132 GC_push_one(state.r18);
133 GC_push_one(state.r19);
134 GC_push_one(state.r20);
135 GC_push_one(state.r21);
136 GC_push_one(state.r22);
137 GC_push_one(state.r23);
138 GC_push_one(state.r24);
139 GC_push_one(state.r25);
140 GC_push_one(state.r26);
141 GC_push_one(state.r27);
142 GC_push_one(state.r28);
143 GC_push_one(state.r29);
144 GC_push_one(state.r30);
145 GC_push_one(state.r31);
147 # error FIXME for non-x86 || ppc architectures
150 if(p->flags & MAIN_THREAD)
155 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
156 (unsigned long) p -> id,
161 GC_push_all_stack(lo,hi);
162 } /* for(p=GC_threads[i]...) */
163 } /* for(i=0;i<THREAD_TABLE_SZ...) */
166 #else /* !DARWIN_DONT_PARSE_STACK; Use FindTopOfStack() */
168 void GC_push_all_stacks() {
174 thread_act_array_t act_list = 0;
175 mach_msg_type_number_t listcount = 0;
177 me = mach_thread_self();
178 if (!GC_thr_initialized) GC_thr_init();
180 my_task = current_task();
181 r = task_threads(my_task, &act_list, &listcount);
182 if(r != KERN_SUCCESS) ABORT("task_threads failed");
183 for(i = 0; i < listcount; i++) {
184 thread_act_t thread = act_list[i];
187 hi = (ptr_t)FindTopOfStack(0);
189 # if defined(POWERPC)
190 # if CPP_WORDSZ == 32
191 ppc_thread_state_t info;
193 ppc_thread_state64_t info;
195 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
196 r = thread_get_state(thread, MACHINE_THREAD_STATE,
197 (natural_t *)&info, &outCount);
198 if(r != KERN_SUCCESS) continue;
200 lo = (void*)(info.r1 - PPC_RED_ZONE_SIZE);
201 hi = (ptr_t)FindTopOfStack(info.r1);
203 GC_push_one(info.r0);
204 GC_push_one(info.r2);
205 GC_push_one(info.r3);
206 GC_push_one(info.r4);
207 GC_push_one(info.r5);
208 GC_push_one(info.r6);
209 GC_push_one(info.r7);
210 GC_push_one(info.r8);
211 GC_push_one(info.r9);
212 GC_push_one(info.r10);
213 GC_push_one(info.r11);
214 GC_push_one(info.r12);
215 GC_push_one(info.r13);
216 GC_push_one(info.r14);
217 GC_push_one(info.r15);
218 GC_push_one(info.r16);
219 GC_push_one(info.r17);
220 GC_push_one(info.r18);
221 GC_push_one(info.r19);
222 GC_push_one(info.r20);
223 GC_push_one(info.r21);
224 GC_push_one(info.r22);
225 GC_push_one(info.r23);
226 GC_push_one(info.r24);
227 GC_push_one(info.r25);
228 GC_push_one(info.r26);
229 GC_push_one(info.r27);
230 GC_push_one(info.r28);
231 GC_push_one(info.r29);
232 GC_push_one(info.r30);
233 GC_push_one(info.r31);
235 /* FIXME: Remove after testing: */
236 WARN("This is completely untested and likely will not work\n", 0);
237 i386_thread_state_t info;
238 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
239 r = thread_get_state(thread, MACHINE_THREAD_STATE,
240 (natural_t *)&info, &outCount);
241 if(r != KERN_SUCCESS) continue;
243 lo = (void*)info.esp;
244 hi = (ptr_t)FindTopOfStack(info.esp);
246 GC_push_one(info.eax);
247 GC_push_one(info.ebx);
248 GC_push_one(info.ecx);
249 GC_push_one(info.edx);
250 GC_push_one(info.edi);
251 GC_push_one(info.esi);
252 /* GC_push_one(info.ebp); */
253 /* GC_push_one(info.esp); */
254 GC_push_one(info.ss);
255 GC_push_one(info.eip);
256 GC_push_one(info.cs);
257 GC_push_one(info.ds);
258 GC_push_one(info.es);
259 GC_push_one(info.fs);
260 GC_push_one(info.gs);
261 # endif /* !POWERPC */
264 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
265 (unsigned long) thread,
270 GC_push_all_stack(lo, hi);
271 mach_port_deallocate(my_task, thread);
272 } /* for(p=GC_threads[i]...) */
273 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
274 mach_port_deallocate(my_task, me);
276 #endif /* !DARWIN_DONT_PARSE_STACK */
278 static mach_port_t GC_mach_handler_thread;
279 static int GC_use_mach_handler_thread = 0;
281 static struct GC_mach_thread GC_mach_threads[THREAD_TABLE_SZ];
282 static int GC_mach_threads_count;
284 void GC_stop_init() {
287 for (i = 0; i < THREAD_TABLE_SZ; i++) {
288 GC_mach_threads[i].thread = 0;
289 GC_mach_threads[i].already_suspended = 0;
291 GC_mach_threads_count = 0;
294 /* returns true if there's a thread in act_list that wasn't in old_list */
295 int GC_suspend_thread_list(thread_act_array_t act_list, int count,
296 thread_act_array_t old_list, int old_count) {
297 mach_port_t my_thread = mach_thread_self();
302 for(i = 0; i < count; i++) {
303 thread_act_t thread = act_list[i];
305 GC_printf1("Attempting to suspend thread %p\n", thread);
307 /* find the current thread in the old list */
309 for(j = 0; j < old_count; j++) {
310 thread_act_t old_thread = old_list[j];
311 if (old_thread == thread) {
317 /* add it to the GC_mach_threads list */
318 GC_mach_threads[GC_mach_threads_count].thread = thread;
319 /* default is not suspended */
320 GC_mach_threads[GC_mach_threads_count].already_suspended = 0;
324 if (thread != my_thread &&
325 (!GC_use_mach_handler_thread
326 || (GC_use_mach_handler_thread
327 && GC_mach_handler_thread != thread))) {
328 struct thread_basic_info info;
329 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
330 kern_return_t kern_result = thread_info(thread, THREAD_BASIC_INFO,
331 (thread_info_t)&info, &outCount);
332 if(kern_result != KERN_SUCCESS) {
333 /* the thread may have quit since the thread_threads () call
334 * we mark already_suspended so it's not dealt with anymore later
337 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
338 GC_mach_threads_count++;
343 GC_printf2("Thread state for 0x%lx = %d\n", thread, info.run_state);
346 GC_mach_threads[GC_mach_threads_count].already_suspended = info.suspend_count;
348 if (info.suspend_count) continue;
351 GC_printf1("Suspending 0x%lx\n", thread);
353 /* Suspend the thread */
354 kern_result = thread_suspend(thread);
355 if(kern_result != KERN_SUCCESS) {
356 /* the thread may have quit since the thread_threads () call
357 * we mark already_suspended so it's not dealt with anymore later
360 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
361 GC_mach_threads_count++;
366 if (!found) GC_mach_threads_count++;
369 mach_port_deallocate(current_task(), my_thread);
374 /* Caller holds allocation lock. */
379 task_t my_task = current_task();
380 mach_port_t my_thread = mach_thread_self();
381 kern_return_t kern_result;
382 thread_act_array_t act_list, prev_list;
383 mach_msg_type_number_t listcount, prevcount;
386 GC_printf1("Stopping the world from 0x%lx\n", mach_thread_self());
389 /* clear out the mach threads list table */
392 /* Make sure all free list construction has stopped before we start. */
393 /* No new construction can start, since free list construction is */
394 /* required to acquire and release the GC lock before it starts, */
395 /* and we have the lock. */
396 # ifdef PARALLEL_MARK
397 GC_acquire_mark_lock();
398 GC_ASSERT(GC_fl_builder_count == 0);
399 /* We should have previously waited for it to become zero. */
400 # endif /* PARALLEL_MARK */
402 /* Loop stopping threads until you have gone over the whole list
403 twice without a new one appearing. thread_create() won't
404 return (and thus the thread stop) until the new thread
405 exists, so there is no window whereby you could stop a
406 thread, recognise it is stopped, but then have a new thread
407 it created before stopping show up later.
415 kern_result = task_threads(my_task, &act_list, &listcount);
417 if(kern_result == KERN_SUCCESS) {
418 result = GC_suspend_thread_list(act_list, listcount,
419 prev_list, prevcount);
422 if(prev_list != NULL) {
423 for(i = 0; i < prevcount; i++)
424 mach_port_deallocate(my_task, prev_list[i]);
426 vm_deallocate(my_task, (vm_address_t)prev_list, sizeof(thread_t) * prevcount);
429 prev_list = act_list;
430 prevcount = listcount;
434 for(i = 0; i < listcount; i++)
435 mach_port_deallocate(my_task, act_list[i]);
437 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
442 extern void GC_mprotect_stop();
447 # ifdef PARALLEL_MARK
448 GC_release_mark_lock();
451 GC_printf1("World stopped from 0x%lx\n", my_thread);
454 mach_port_deallocate(my_task, my_thread);
457 /* Caller holds allocation lock, and has held it continuously since */
458 /* the world stopped. */
459 void GC_start_world()
461 task_t my_task = current_task();
462 mach_port_t my_thread = mach_thread_self();
465 kern_return_t kern_result;
466 thread_act_array_t act_list;
467 mach_msg_type_number_t listcount;
468 struct thread_basic_info info;
469 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
472 GC_printf0("World starting\n");
477 extern void GC_mprotect_resume();
478 GC_mprotect_resume();
482 kern_result = task_threads(my_task, &act_list, &listcount);
483 for(i = 0; i < listcount; i++) {
484 thread_act_t thread = act_list[i];
485 if (thread != my_thread &&
486 (!GC_use_mach_handler_thread ||
487 (GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
488 for(j = 0; j < GC_mach_threads_count; j++) {
489 if (thread == GC_mach_threads[j].thread) {
490 if (GC_mach_threads[j].already_suspended) {
492 GC_printf1("Not resuming already suspended thread %p\n", thread);
496 kern_result = thread_info(thread, THREAD_BASIC_INFO,
497 (thread_info_t)&info, &outCount);
498 if(kern_result != KERN_SUCCESS) continue;
500 GC_printf2("Thread state for 0x%lx = %d\n", thread,
502 GC_printf1("Resuming 0x%lx\n", thread);
504 /* Resume the thread */
505 kern_result = thread_resume(thread);
506 if(kern_result != KERN_SUCCESS) continue;
511 mach_port_deallocate(my_task, thread);
513 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
515 mach_port_deallocate(my_task, my_thread);
517 GC_printf0("World started\n");
521 void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
522 GC_mach_handler_thread = thread;
523 GC_use_mach_handler_thread = 1;