3 #include "private/pthread_support.h"
5 /* This probably needs more porting work to ppc64. */
7 # if defined(GC_DARWIN_THREADS)
9 /* From "Inside Mac OS X - Mach-O Runtime Architecture" published by Apple
11 "The space beneath the stack pointer, where a new stack frame would normally
12 be allocated, is called the red zone. This area as shown in Figure 3-2 may
13 be used for any purpose as long as a new stack frame does not need to be
16 Page 50: "If a leaf procedure's red zone usage would exceed 224 bytes, then
17 it must set up a stack frame just like routines that call other routines."
21 # define PPC_RED_ZONE_SIZE 224
22 # elif CPP_WORDSZ == 64
23 # define PPC_RED_ZONE_SIZE 320
27 typedef struct StackFrame {
28 unsigned long savedSP;
29 unsigned long savedCR;
30 unsigned long savedLR;
31 unsigned long reserved[2];
32 unsigned long savedRTOC;
35 unsigned long FindTopOfStack(unsigned int stack_start) {
38 if (stack_start == 0) {
41 __asm__ volatile("lwz %0,0(r1)" : "=r" (frame));
43 __asm__ volatile("ld %0,0(r1)" : "=r" (frame));
47 frame = (StackFrame *)stack_start;
51 /* GC_printf1("FindTopOfStack start at sp = %p\n", frame); */
54 if (frame->savedSP == 0) break;
55 /* if there are no more stack frames, stop */
57 frame = (StackFrame*)frame->savedSP;
59 /* we do these next two checks after going to the next frame
60 because the LR for the first stack frame in the loop
61 is not set up on purpose, so we shouldn't check it. */
62 if ((frame->savedLR & ~3) == 0) break; /* if the next LR is bogus, stop */
63 if ((~(frame->savedLR) & ~3) == 0) break; /* ditto */
67 /* GC_printf1("FindTopOfStack finish at sp = %p\n", frame); */
70 return (unsigned long)frame;
73 #ifdef DARWIN_DONT_PARSE_STACK
74 void GC_push_all_stacks() {
81 ppc_thread_state_t state;
83 i386_thread_state_t state;
85 # error FIXME for non-x86 || ppc architectures
87 mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
90 if (!GC_thr_initialized) GC_thr_init();
92 for(i=0;i<THREAD_TABLE_SZ;i++) {
93 for(p=GC_threads[i];p!=0;p=p->next) {
94 if(p -> flags & FINISHED) continue;
95 if(pthread_equal(p->id,me)) {
98 /* Get the thread state (registers, etc) */
100 p->stop_info.mach_thread,
101 MACHINE_THREAD_STATE,
103 &thread_state_count);
104 if(r != KERN_SUCCESS) ABORT("thread_get_state failed");
109 GC_push_one(state.eax);
110 GC_push_one(state.ebx);
111 GC_push_one(state.ecx);
112 GC_push_one(state.edx);
113 GC_push_one(state.edi);
114 GC_push_one(state.esi);
115 GC_push_one(state.ebp);
116 #elif defined(POWERPC)
117 lo = (void*)(state.r1 - PPC_RED_ZONE_SIZE);
119 GC_push_one(state.r0);
120 GC_push_one(state.r2);
121 GC_push_one(state.r3);
122 GC_push_one(state.r4);
123 GC_push_one(state.r5);
124 GC_push_one(state.r6);
125 GC_push_one(state.r7);
126 GC_push_one(state.r8);
127 GC_push_one(state.r9);
128 GC_push_one(state.r10);
129 GC_push_one(state.r11);
130 GC_push_one(state.r12);
131 GC_push_one(state.r13);
132 GC_push_one(state.r14);
133 GC_push_one(state.r15);
134 GC_push_one(state.r16);
135 GC_push_one(state.r17);
136 GC_push_one(state.r18);
137 GC_push_one(state.r19);
138 GC_push_one(state.r20);
139 GC_push_one(state.r21);
140 GC_push_one(state.r22);
141 GC_push_one(state.r23);
142 GC_push_one(state.r24);
143 GC_push_one(state.r25);
144 GC_push_one(state.r26);
145 GC_push_one(state.r27);
146 GC_push_one(state.r28);
147 GC_push_one(state.r29);
148 GC_push_one(state.r30);
149 GC_push_one(state.r31);
151 # error FIXME for non-x86 || ppc architectures
154 if(p->flags & MAIN_THREAD)
159 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
160 (unsigned long) p -> id,
165 GC_push_all_stack(lo,hi);
166 } /* for(p=GC_threads[i]...) */
167 } /* for(i=0;i<THREAD_TABLE_SZ...) */
170 #else /* !DARWIN_DONT_PARSE_STACK; Use FindTopOfStack() */
172 void GC_push_all_stacks() {
178 thread_act_array_t act_list = 0;
179 mach_msg_type_number_t listcount = 0;
181 me = mach_thread_self();
182 if (!GC_thr_initialized) GC_thr_init();
184 my_task = current_task();
185 r = task_threads(my_task, &act_list, &listcount);
186 if(r != KERN_SUCCESS) ABORT("task_threads failed");
187 for(i = 0; i < listcount; i++) {
188 thread_act_t thread = act_list[i];
191 hi = (ptr_t)FindTopOfStack(0);
193 # if defined(POWERPC)
194 # if CPP_WORDSZ == 32
195 ppc_thread_state_t info;
197 ppc_thread_state64_t info;
199 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
200 r = thread_get_state(thread, MACHINE_THREAD_STATE,
201 (natural_t *)&info, &outCount);
202 if(r != KERN_SUCCESS) ABORT("task_get_state failed");
204 lo = (void*)(info.r1 - PPC_RED_ZONE_SIZE);
205 hi = (ptr_t)FindTopOfStack(info.r1);
207 GC_push_one(info.r0);
208 GC_push_one(info.r2);
209 GC_push_one(info.r3);
210 GC_push_one(info.r4);
211 GC_push_one(info.r5);
212 GC_push_one(info.r6);
213 GC_push_one(info.r7);
214 GC_push_one(info.r8);
215 GC_push_one(info.r9);
216 GC_push_one(info.r10);
217 GC_push_one(info.r11);
218 GC_push_one(info.r12);
219 GC_push_one(info.r13);
220 GC_push_one(info.r14);
221 GC_push_one(info.r15);
222 GC_push_one(info.r16);
223 GC_push_one(info.r17);
224 GC_push_one(info.r18);
225 GC_push_one(info.r19);
226 GC_push_one(info.r20);
227 GC_push_one(info.r21);
228 GC_push_one(info.r22);
229 GC_push_one(info.r23);
230 GC_push_one(info.r24);
231 GC_push_one(info.r25);
232 GC_push_one(info.r26);
233 GC_push_one(info.r27);
234 GC_push_one(info.r28);
235 GC_push_one(info.r29);
236 GC_push_one(info.r30);
237 GC_push_one(info.r31);
239 /* FIXME: Remove after testing: */
240 WARN("This is completely untested and likely will not work\n", 0);
241 i386_thread_state_t info;
242 mach_msg_type_number_t outCount = THREAD_STATE_MAX;
243 r = thread_get_state(thread, MACHINE_THREAD_STATE,
244 (natural_t *)&info, &outCount);
245 if(r != KERN_SUCCESS) ABORT("task_get_state failed");
247 lo = (void*)info.esp;
248 hi = (ptr_t)FindTopOfStack(info.esp);
250 GC_push_one(info.eax);
251 GC_push_one(info.ebx);
252 GC_push_one(info.ecx);
253 GC_push_one(info.edx);
254 GC_push_one(info.edi);
255 GC_push_one(info.esi);
256 /* GC_push_one(info.ebp); */
257 /* GC_push_one(info.esp); */
258 GC_push_one(info.ss);
259 GC_push_one(info.eip);
260 GC_push_one(info.cs);
261 GC_push_one(info.ds);
262 GC_push_one(info.es);
263 GC_push_one(info.fs);
264 GC_push_one(info.gs);
265 # endif /* !POWERPC */
268 GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
269 (unsigned long) thread,
274 GC_push_all_stack(lo, hi);
275 mach_port_deallocate(my_task, thread);
276 } /* for(p=GC_threads[i]...) */
277 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
278 mach_port_deallocate(my_task, me);
280 #endif /* !DARWIN_DONT_PARSE_STACK */
282 static mach_port_t GC_mach_handler_thread;
283 static int GC_use_mach_handler_thread = 0;
285 static struct GC_mach_thread GC_mach_threads[THREAD_TABLE_SZ];
286 static int GC_mach_threads_count;
288 void GC_stop_init() {
291 for (i = 0; i < THREAD_TABLE_SZ; i++) {
292 GC_mach_threads[i].thread = 0;
293 GC_mach_threads[i].already_suspended = 0;
295 GC_mach_threads_count = 0;
298 /* returns true if there's a thread in act_list that wasn't in old_list */
299 int GC_suspend_thread_list(thread_act_array_t act_list, int count,
300 thread_act_array_t old_list, int old_count) {
301 mach_port_t my_thread = mach_thread_self();
306 for(i = 0; i < count; i++) {
307 thread_act_t thread = act_list[i];
309 GC_printf1("Attempting to suspend thread %p\n", thread);
311 /* find the current thread in the old list */
313 for(j = 0; j < old_count; j++) {
314 thread_act_t old_thread = old_list[j];
315 if (old_thread == thread) {
321 /* add it to the GC_mach_threads list */
322 GC_mach_threads[GC_mach_threads_count].thread = thread;
323 /* default is not suspended */
324 GC_mach_threads[GC_mach_threads_count].already_suspended = 0;
328 if (thread != my_thread &&
329 (!GC_use_mach_handler_thread
330 || (GC_use_mach_handler_thread
331 && GC_mach_handler_thread != thread))) {
332 struct thread_basic_info info;
333 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
334 kern_return_t kern_result = thread_info(thread, THREAD_BASIC_INFO,
335 (thread_info_t)&info, &outCount);
336 if(kern_result != KERN_SUCCESS) {
337 /* the thread may have quit since the thread_threads () call
338 * we mark already_suspended so it's not dealt with anymore later
341 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
342 GC_mach_threads_count++;
347 GC_printf2("Thread state for 0x%lx = %d\n", thread, info.run_state);
350 GC_mach_threads[GC_mach_threads_count].already_suspended = info.suspend_count;
352 if (info.suspend_count) continue;
355 GC_printf1("Suspending 0x%lx\n", thread);
357 /* Suspend the thread */
358 kern_result = thread_suspend(thread);
359 if(kern_result != KERN_SUCCESS) {
360 /* the thread may have quit since the thread_threads () call
361 * we mark already_suspended so it's not dealt with anymore later
364 GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
365 GC_mach_threads_count++;
370 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);
419 result = GC_suspend_thread_list(act_list, listcount,
420 prev_list, prevcount);
422 prev_list = act_list;
423 prevcount = listcount;
425 if(kern_result == KERN_SUCCESS) {
428 for(i = 0; i < listcount; i++)
429 mach_port_deallocate(my_task, act_list[i]);
431 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
438 extern void GC_mprotect_stop();
443 # ifdef PARALLEL_MARK
444 GC_release_mark_lock();
447 GC_printf1("World stopped from 0x%lx\n", my_thread);
450 mach_port_deallocate(my_task, my_thread);
453 /* Caller holds allocation lock, and has held it continuously since */
454 /* the world stopped. */
455 void GC_start_world()
457 task_t my_task = current_task();
458 mach_port_t my_thread = mach_thread_self();
461 kern_return_t kern_result;
462 thread_act_array_t act_list;
463 mach_msg_type_number_t listcount;
464 struct thread_basic_info info;
465 mach_msg_type_number_t outCount = THREAD_INFO_MAX;
468 GC_printf0("World starting\n");
473 extern void GC_mprotect_resume();
474 GC_mprotect_resume();
478 kern_result = task_threads(my_task, &act_list, &listcount);
479 for(i = 0; i < listcount; i++) {
480 thread_act_t thread = act_list[i];
481 if (thread != my_thread &&
482 (!GC_use_mach_handler_thread ||
483 (GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
484 for(j = 0; j < GC_mach_threads_count; j++) {
485 if (thread == GC_mach_threads[j].thread) {
486 if (GC_mach_threads[j].already_suspended) {
488 GC_printf1("Not resuming already suspended thread %p\n", thread);
492 kern_result = thread_info(thread, THREAD_BASIC_INFO,
493 (thread_info_t)&info, &outCount);
494 if(kern_result != KERN_SUCCESS) ABORT("thread_info failed");
496 GC_printf2("Thread state for 0x%lx = %d\n", thread,
498 GC_printf1("Resuming 0x%lx\n", thread);
500 /* Resume the thread */
501 kern_result = thread_resume(thread);
502 if(kern_result != KERN_SUCCESS) ABORT("thread_resume failed");
507 mach_port_deallocate(my_task, thread);
509 vm_deallocate(my_task, (vm_address_t)act_list, sizeof(thread_t) * listcount);
511 mach_port_deallocate(my_task, my_thread);
513 GC_printf0("World started\n");
517 void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
518 GC_mach_handler_thread = thread;
519 GC_use_mach_handler_thread = 1;