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;
78 mach_msg_type_number_t thread_state_count = PPC_THREAD_STATE_COUNT;
80 i386_thread_state_t state;
81 mach_msg_type_number_t thread_state_count = i386_THREAD_STATE_COUNT;
83 # error FIXME for non-x86 || ppc architectures
84 mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
88 if (!GC_thr_initialized) GC_thr_init();
90 for(i=0;i<THREAD_TABLE_SZ;i++) {
91 for(p=GC_threads[i];p!=0;p=p->next) {
92 if(p -> flags & FINISHED) continue;
93 if(pthread_equal(p->id,me)) {
96 /* Get the thread state (registers, etc) */
98 p->stop_info.mach_thread,
99 GC_MACH_THREAD_STATE_FLAVOR,
101 &thread_state_count);
102 if(r != KERN_SUCCESS) ABORT("thread_get_state failed");
107 GC_push_one(state.eax);
108 GC_push_one(state.ebx);
109 GC_push_one(state.ecx);
110 GC_push_one(state.edx);
111 GC_push_one(state.edi);
112 GC_push_one(state.esi);
113 GC_push_one(state.ebp);
114 #elif defined(POWERPC)
115 lo = (void*)(state.r1 - PPC_RED_ZONE_SIZE);
117 GC_push_one(state.r0);
118 GC_push_one(state.r2);
119 GC_push_one(state.r3);
120 GC_push_one(state.r4);
121 GC_push_one(state.r5);
122 GC_push_one(state.r6);
123 GC_push_one(state.r7);
124 GC_push_one(state.r8);
125 GC_push_one(state.r9);
126 GC_push_one(state.r10);
127 GC_push_one(state.r11);
128 GC_push_one(state.r12);
129 GC_push_one(state.r13);
130 GC_push_one(state.r14);
131 GC_push_one(state.r15);
132 GC_push_one(state.r16);
133 GC_push_one(state.r17);
134 GC_push_one(state.r18);
135 GC_push_one(state.r19);
136 GC_push_one(state.r20);
137 GC_push_one(state.r21);
138 GC_push_one(state.r22);
139 GC_push_one(state.r23);
140 GC_push_one(state.r24);
141 GC_push_one(state.r25);
142 GC_push_one(state.r26);
143 GC_push_one(state.r27);
144 GC_push_one(state.r28);
145 GC_push_one(state.r29);
146 GC_push_one(state.r30);
147 GC_push_one(state.r31);
149 # error FIXME for non-x86 || ppc architectures
152 if(p->flags & MAIN_THREAD)
157 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
158 (unsigned long) p -> id,
163 GC_push_all_stack(lo,hi);
164 } /* for(p=GC_threads[i]...) */
165 } /* for(i=0;i<THREAD_TABLE_SZ...) */
168 #else /* !DARWIN_DONT_PARSE_STACK; Use FindTopOfStack() */
170 void GC_push_all_stacks() {
176 thread_act_array_t act_list = 0;
177 mach_msg_type_number_t listcount = 0;
179 me = mach_thread_self();
180 if (!GC_thr_initialized) GC_thr_init();
182 my_task = current_task();
183 r = task_threads(my_task, &act_list, &listcount);
184 if(r != KERN_SUCCESS) ABORT("task_threads failed");
185 for(i = 0; i < listcount; i++) {
186 thread_act_t thread = act_list[i];
189 hi = (ptr_t)FindTopOfStack(0);
191 # if defined(POWERPC)
192 # if CPP_WORDSZ == 32
193 ppc_thread_state_t info;
195 ppc_thread_state64_t info;
197 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
198 r = thread_get_state(thread, GC_MACH_THREAD_STATE_FLAVOR,
199 (natural_t *)&info, &outCount);
200 if(r != KERN_SUCCESS) continue;
202 lo = (void*)(info.r1 - PPC_RED_ZONE_SIZE);
203 hi = (ptr_t)FindTopOfStack(info.r1);
205 GC_push_one(info.r0);
206 GC_push_one(info.r2);
207 GC_push_one(info.r3);
208 GC_push_one(info.r4);
209 GC_push_one(info.r5);
210 GC_push_one(info.r6);
211 GC_push_one(info.r7);
212 GC_push_one(info.r8);
213 GC_push_one(info.r9);
214 GC_push_one(info.r10);
215 GC_push_one(info.r11);
216 GC_push_one(info.r12);
217 GC_push_one(info.r13);
218 GC_push_one(info.r14);
219 GC_push_one(info.r15);
220 GC_push_one(info.r16);
221 GC_push_one(info.r17);
222 GC_push_one(info.r18);
223 GC_push_one(info.r19);
224 GC_push_one(info.r20);
225 GC_push_one(info.r21);
226 GC_push_one(info.r22);
227 GC_push_one(info.r23);
228 GC_push_one(info.r24);
229 GC_push_one(info.r25);
230 GC_push_one(info.r26);
231 GC_push_one(info.r27);
232 GC_push_one(info.r28);
233 GC_push_one(info.r29);
234 GC_push_one(info.r30);
235 GC_push_one(info.r31);
237 /* FIXME: Remove after testing: */
238 WARN("This is completely untested and likely will not work\n", 0);
239 i386_thread_state_t info;
240 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
241 r = thread_get_state(thread, GC_MACH_THREAD_STATE_FLAVOR,
242 (natural_t *)&info, &outCount);
243 if(r != KERN_SUCCESS) continue;
245 lo = (void*)info.esp;
246 hi = (ptr_t)FindTopOfStack(info.esp);
248 GC_push_one(info.eax);
249 GC_push_one(info.ebx);
250 GC_push_one(info.ecx);
251 GC_push_one(info.edx);
252 GC_push_one(info.edi);
253 GC_push_one(info.esi);
254 /* GC_push_one(info.ebp); */
255 /* GC_push_one(info.esp); */
256 GC_push_one(info.ss);
257 GC_push_one(info.eip);
258 GC_push_one(info.cs);
259 GC_push_one(info.ds);
260 GC_push_one(info.es);
261 GC_push_one(info.fs);
262 GC_push_one(info.gs);
263 # endif /* !POWERPC */
266 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
267 (unsigned long) thread,
272 GC_push_all_stack(lo, hi);
273 mach_port_deallocate(my_task, thread);
274 } /* for(p=GC_threads[i]...) */
275 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
276 mach_port_deallocate(my_task, me);
278 #endif /* !DARWIN_DONT_PARSE_STACK */
280 static mach_port_t GC_mach_handler_thread;
281 static int GC_use_mach_handler_thread = 0;
283 #define SUSPEND_THREADS_SIZE 2048
284 static struct GC_mach_thread GC_mach_threads[SUSPEND_THREADS_SIZE];
285 static int GC_mach_threads_count;
287 void GC_stop_init() {
290 for (i = 0; i < SUSPEND_THREADS_SIZE; i++) {
291 GC_mach_threads[i].thread = 0;
292 GC_mach_threads[i].already_suspended = 0;
294 GC_mach_threads_count = 0;
297 /* returns true if there's a thread in act_list that wasn't in old_list */
298 int GC_suspend_thread_list(thread_act_array_t act_list, int count,
299 thread_act_array_t old_list, int old_count) {
300 mach_port_t my_thread = mach_thread_self();
305 for(i = 0; i < count; i++) {
306 thread_act_t thread = act_list[i];
308 GC_printf1("Attempting to suspend thread %p\n", thread);
310 /* find the current thread in the old list */
312 for(j = 0; j < old_count; j++) {
313 thread_act_t old_thread = old_list[j];
314 if (old_thread == thread) {
320 /* add it to the GC_mach_threads list */
321 GC_mach_threads[GC_mach_threads_count].thread = thread;
322 /* default is not suspended */
323 GC_mach_threads[GC_mach_threads_count].already_suspended = 0;
327 if (thread != my_thread &&
328 (!GC_use_mach_handler_thread
329 || (GC_use_mach_handler_thread
330 && GC_mach_handler_thread != thread))) {
331 struct thread_basic_info info;
332 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
333 kern_return_t kern_result = thread_info(thread, THREAD_BASIC_INFO,
334 (thread_info_t)&info, &outCount);
335 if(kern_result != KERN_SUCCESS) {
336 /* the thread may have quit since the thread_threads () call
337 * we mark already_suspended so it's not dealt with anymore later
340 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
341 GC_mach_threads_count++;
346 GC_printf2("Thread state for 0x%lx = %d\n", thread, info.run_state);
349 GC_mach_threads[GC_mach_threads_count].already_suspended = info.suspend_count;
351 if (info.suspend_count) continue;
354 GC_printf1("Suspending 0x%lx\n", thread);
356 /* Suspend the thread */
357 kern_result = thread_suspend(thread);
358 if(kern_result != KERN_SUCCESS) {
359 /* the thread may have quit since the thread_threads () call
360 * we mark already_suspended so it's not dealt with anymore later
363 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
364 GC_mach_threads_count++;
369 if (!found) GC_mach_threads_count++;
372 mach_port_deallocate(current_task(), my_thread);
377 /* Caller holds allocation lock. */
382 task_t my_task = current_task();
383 mach_port_t my_thread = mach_thread_self();
384 kern_return_t kern_result;
385 thread_act_array_t act_list, prev_list;
386 mach_msg_type_number_t listcount, prevcount;
389 GC_printf1("Stopping the world from 0x%lx\n", mach_thread_self());
392 /* clear out the mach threads list table */
395 /* Make sure all free list construction has stopped before we start. */
396 /* No new construction can start, since free list construction is */
397 /* required to acquire and release the GC lock before it starts, */
398 /* and we have the lock. */
399 # ifdef PARALLEL_MARK
400 GC_acquire_mark_lock();
401 GC_ASSERT(GC_fl_builder_count == 0);
402 /* We should have previously waited for it to become zero. */
403 # endif /* PARALLEL_MARK */
405 /* Loop stopping threads until you have gone over the whole list
406 twice without a new one appearing. thread_create() won't
407 return (and thus the thread stop) until the new thread
408 exists, so there is no window whereby you could stop a
409 thread, recognise it is stopped, but then have a new thread
410 it created before stopping show up later.
418 kern_result = task_threads(my_task, &act_list, &listcount);
420 if(kern_result == KERN_SUCCESS) {
421 result = GC_suspend_thread_list(act_list, listcount,
422 prev_list, prevcount);
425 if(prev_list != NULL) {
426 for(i = 0; i < prevcount; i++)
427 mach_port_deallocate(my_task, prev_list[i]);
429 vm_deallocate(my_task, (vm_address_t)prev_list, sizeof(thread_t) * prevcount);
432 prev_list = act_list;
433 prevcount = listcount;
437 for(i = 0; i < listcount; i++)
438 mach_port_deallocate(my_task, act_list[i]);
440 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
445 extern void GC_mprotect_stop();
450 # ifdef PARALLEL_MARK
451 GC_release_mark_lock();
454 GC_printf1("World stopped from 0x%lx\n", my_thread);
457 mach_port_deallocate(my_task, my_thread);
460 /* Caller holds allocation lock, and has held it continuously since */
461 /* the world stopped. */
462 void GC_start_world()
464 task_t my_task = current_task();
465 mach_port_t my_thread = mach_thread_self();
468 kern_return_t kern_result;
469 thread_act_array_t act_list;
470 mach_msg_type_number_t listcount;
471 struct thread_basic_info info;
472 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
475 GC_printf0("World starting\n");
480 extern void GC_mprotect_resume();
481 GC_mprotect_resume();
485 kern_result = task_threads(my_task, &act_list, &listcount);
486 for(i = 0; i < listcount; i++) {
487 thread_act_t thread = act_list[i];
488 if (thread != my_thread &&
489 (!GC_use_mach_handler_thread ||
490 (GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
491 for(j = 0; j < GC_mach_threads_count; j++) {
492 if (thread == GC_mach_threads[j].thread) {
493 if (GC_mach_threads[j].already_suspended) {
495 GC_printf1("Not resuming already suspended thread %p\n", thread);
499 kern_result = thread_info(thread, THREAD_BASIC_INFO,
500 (thread_info_t)&info, &outCount);
501 if(kern_result != KERN_SUCCESS) continue;
503 GC_printf2("Thread state for 0x%lx = %d\n", thread,
505 GC_printf1("Resuming 0x%lx\n", thread);
507 /* Resume the thread */
508 kern_result = thread_resume(thread);
509 if(kern_result != KERN_SUCCESS) continue;
514 mach_port_deallocate(my_task, thread);
516 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
518 mach_port_deallocate(my_task, my_thread);
520 GC_printf0("World started\n");
524 void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
525 GC_mach_handler_thread = thread;
526 GC_use_mach_handler_thread = 1;