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381 lines
11 KiB
C
381 lines
11 KiB
C
#include "private/pthread_support.h"
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# if defined(GC_DARWIN_THREADS)
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/* From "Inside Mac OS X - Mach-O Runtime Architecture" published by Apple
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Page 49:
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"The space beneath the stack pointer, where a new stack frame would normally
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be allocated, is called the red zone. This area as shown in Figure 3-2 may
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be used for any purpose as long as a new stack frame does not need to be
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added to the stack."
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Page 50: "If a leaf procedure's red zone usage would exceed 224 bytes, then
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it must set up a stack frame just like routines that call other routines."
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*/
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#define PPC_RED_ZONE_SIZE 224
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/* Not 64-bit clean. Wait until Apple defines their 64-bit ABI */
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typedef struct StackFrame {
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unsigned int savedSP;
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unsigned int savedCR;
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unsigned int savedLR;
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unsigned int reserved[2];
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unsigned int savedRTOC;
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} StackFrame;
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unsigned int FindTopOfStack(unsigned int stack_start) {
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StackFrame *frame;
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if (stack_start == 0) {
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__asm__ volatile("lwz %0,0(r1)" : "=r" (frame));
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} else {
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frame = (StackFrame *)stack_start;
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}
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# ifdef DEBUG_THREADS
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/* GC_printf1("FindTopOfStack start at sp = %p\n", frame); */
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# endif
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do {
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if (frame->savedSP == NULL) break;
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/* if there are no more stack frames, stop */
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frame = (StackFrame*)frame->savedSP;
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/* we do these next two checks after going to the next frame
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because the LR for the first stack frame in the loop
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is not set up on purpose, so we shouldn't check it. */
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if ((frame->savedLR & ~3) == 0) break; /* if the next LR is bogus, stop */
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if ((~(frame->savedLR) & ~3) == 0) break; /* ditto */
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} while (1);
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# ifdef DEBUG_THREADS
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/* GC_printf1("FindTopOfStack finish at sp = %p\n", frame); */
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# endif
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return (unsigned int)frame;
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}
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void GC_push_all_stacks() {
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int i;
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kern_return_t r;
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mach_port_t me;
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ptr_t lo, hi;
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thread_act_array_t act_list = 0;
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mach_msg_type_number_t listcount = 0;
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me = mach_thread_self();
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if (!GC_thr_initialized) GC_thr_init();
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r = task_threads(current_task(), &act_list, &listcount);
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if(r != KERN_SUCCESS) ABORT("task_threads failed");
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for(i = 0; i < listcount; i++) {
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thread_act_t thread = act_list[i];
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if (thread == me) {
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lo = GC_approx_sp();
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hi = (ptr_t)FindTopOfStack(0);
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} else {
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# ifdef POWERPC
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ppc_thread_state_t info;
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mach_msg_type_number_t outCount = THREAD_STATE_MAX;
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r = thread_get_state(thread, MACHINE_THREAD_STATE,
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(natural_t *)&info, &outCount);
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if(r != KERN_SUCCESS) ABORT("task_get_state failed");
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lo = (void*)(info.r1 - PPC_RED_ZONE_SIZE);
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hi = (ptr_t)FindTopOfStack(info.r1);
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GC_push_one(info.r0);
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GC_push_one(info.r2);
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GC_push_one(info.r3);
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GC_push_one(info.r4);
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GC_push_one(info.r5);
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GC_push_one(info.r6);
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GC_push_one(info.r7);
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GC_push_one(info.r8);
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GC_push_one(info.r9);
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GC_push_one(info.r10);
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GC_push_one(info.r11);
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GC_push_one(info.r12);
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GC_push_one(info.r13);
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GC_push_one(info.r14);
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GC_push_one(info.r15);
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GC_push_one(info.r16);
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GC_push_one(info.r17);
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GC_push_one(info.r18);
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GC_push_one(info.r19);
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GC_push_one(info.r20);
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GC_push_one(info.r21);
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GC_push_one(info.r22);
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GC_push_one(info.r23);
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GC_push_one(info.r24);
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GC_push_one(info.r25);
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GC_push_one(info.r26);
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GC_push_one(info.r27);
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GC_push_one(info.r28);
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GC_push_one(info.r29);
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GC_push_one(info.r30);
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GC_push_one(info.r31);
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# else
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/* FIXME: Remove after testing: */
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WARN("This is completely untested and likely will not work\n", 0);
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i386_thread_state_t info;
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mach_msg_type_number_t outCount = THREAD_STATE_MAX;
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r = thread_get_state(thread, MACHINE_THREAD_STATE,
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(natural_t *)&info, &outCount);
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if(r != KERN_SUCCESS) ABORT("task_get_state failed");
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lo = (void*)info.esp;
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hi = (ptr_t)FindTopOfStack(info.esp);
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GC_push_one(info.eax);
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GC_push_one(info.ebx);
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GC_push_one(info.ecx);
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GC_push_one(info.edx);
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GC_push_one(info.edi);
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GC_push_one(info.esi);
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/* GC_push_one(info.ebp); */
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/* GC_push_one(info.esp); */
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GC_push_one(info.ss);
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GC_push_one(info.eip);
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GC_push_one(info.cs);
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GC_push_one(info.ds);
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GC_push_one(info.es);
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GC_push_one(info.fs);
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GC_push_one(info.gs);
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# endif /* !POWERPC */
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}
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# if DEBUG_THREADS
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GC_printf3("Darwin: Stack for thread 0x%lx = [%lx,%lx)\n",
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(unsigned long) thread,
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(unsigned long) lo,
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(unsigned long) hi
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);
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# endif
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GC_push_all_stack(lo, hi);
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} /* for(p=GC_threads[i]...) */
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}
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static mach_port_t GC_mach_handler_thread;
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static int GC_use_mach_handler_thread = 0;
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static struct GC_mach_thread GC_mach_threads[THREAD_TABLE_SZ];
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static int GC_mach_threads_count;
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void GC_stop_init() {
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int i;
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for (i = 0; i < THREAD_TABLE_SZ; i++) {
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GC_mach_threads[i].thread = 0;
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GC_mach_threads[i].already_suspended = 0;
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}
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GC_mach_threads_count = 0;
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}
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/* returns true if there's a thread in act_list that wasn't in old_list */
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int GC_suspend_thread_list(thread_act_array_t act_list, int count,
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thread_act_array_t old_list, int old_count) {
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mach_port_t my_thread = mach_thread_self();
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int i, j;
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int changed = 0;
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for(i = 0; i < count; i++) {
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thread_act_t thread = act_list[i];
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# if DEBUG_THREADS
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GC_printf1("Attempting to suspend thread %p\n", thread);
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# endif
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/* find the current thread in the old list */
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int found = 0;
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for(j = 0; j < old_count; j++) {
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thread_act_t old_thread = old_list[j];
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if (old_thread == thread) {
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found = 1;
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break;
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}
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}
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if (!found) {
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/* add it to the GC_mach_threads list */
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GC_mach_threads[GC_mach_threads_count].thread = thread;
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/* default is not suspended */
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GC_mach_threads[GC_mach_threads_count].already_suspended = 0;
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changed = 1;
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}
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if (thread != my_thread &&
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(!GC_use_mach_handler_thread
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|| (GC_use_mach_handler_thread
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&& GC_mach_handler_thread != thread))) {
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struct thread_basic_info info;
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mach_msg_type_number_t outCount = THREAD_INFO_MAX;
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kern_return_t kern_result = thread_info(thread, THREAD_BASIC_INFO,
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(thread_info_t)&info, &outCount);
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if(kern_result != KERN_SUCCESS) {
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/* the thread may have quit since the thread_threads () call
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* we mark already_suspended so it's not dealt with anymore later
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*/
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if (!found) {
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GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
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GC_mach_threads_count++;
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}
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continue;
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}
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# if DEBUG_THREADS
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GC_printf2("Thread state for 0x%lx = %d\n", thread, info.run_state);
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# endif
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if (!found) {
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GC_mach_threads[GC_mach_threads_count].already_suspended = info.suspend_count;
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}
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if (info.suspend_count) continue;
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# if DEBUG_THREADS
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GC_printf1("Suspending 0x%lx\n", thread);
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# endif
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/* Suspend the thread */
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kern_result = thread_suspend(thread);
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if(kern_result != KERN_SUCCESS) {
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/* the thread may have quit since the thread_threads () call
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* we mark already_suspended so it's not dealt with anymore later
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*/
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if (!found) {
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GC_mach_threads[GC_mach_threads_count].already_suspended = TRUE;
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GC_mach_threads_count++;
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}
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continue;
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}
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}
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if (!found) GC_mach_threads_count++;
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}
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return changed;
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}
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/* Caller holds allocation lock. */
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void GC_stop_world()
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{
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int i, changes;
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GC_thread p;
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mach_port_t my_thread = mach_thread_self();
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kern_return_t kern_result;
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thread_act_array_t act_list, prev_list;
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mach_msg_type_number_t listcount, prevcount;
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# if DEBUG_THREADS
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GC_printf1("Stopping the world from 0x%lx\n", mach_thread_self());
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# endif
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/* clear out the mach threads list table */
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GC_stop_init();
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/* Make sure all free list construction has stopped before we start. */
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/* No new construction can start, since free list construction is */
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/* required to acquire and release the GC lock before it starts, */
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/* and we have the lock. */
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# ifdef PARALLEL_MARK
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GC_acquire_mark_lock();
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GC_ASSERT(GC_fl_builder_count == 0);
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/* We should have previously waited for it to become zero. */
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# endif /* PARALLEL_MARK */
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/* Loop stopping threads until you have gone over the whole list
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twice without a new one appearing. thread_create() won't
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return (and thus the thread stop) until the new thread
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exists, so there is no window whereby you could stop a
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thread, recognise it is stopped, but then have a new thread
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it created before stopping show up later.
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*/
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changes = 1;
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prev_list = NULL;
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prevcount = 0;
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do {
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int result;
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kern_result = task_threads(current_task(), &act_list, &listcount);
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result = GC_suspend_thread_list(act_list, listcount,
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prev_list, prevcount);
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changes = result;
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prev_list = act_list;
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prevcount = listcount;
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} while (changes);
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# ifdef MPROTECT_VDB
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if(GC_incremental) {
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extern void GC_mprotect_stop();
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GC_mprotect_stop();
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}
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# endif
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# ifdef PARALLEL_MARK
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GC_release_mark_lock();
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# endif
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#if DEBUG_THREADS
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GC_printf1("World stopped from 0x%lx\n", my_thread);
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#endif
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}
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/* Caller holds allocation lock, and has held it continuously since */
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/* the world stopped. */
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void GC_start_world()
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{
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mach_port_t my_thread = mach_thread_self();
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int i, j;
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GC_thread p;
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kern_return_t kern_result;
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thread_act_array_t act_list;
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mach_msg_type_number_t listcount;
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# if DEBUG_THREADS
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GC_printf0("World starting\n");
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# endif
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# ifdef MPROTECT_VDB
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if(GC_incremental) {
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extern void GC_mprotect_resume();
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GC_mprotect_resume();
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}
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# endif
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kern_result = task_threads(current_task(), &act_list, &listcount);
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for(i = 0; i < listcount; i++) {
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thread_act_t thread = act_list[i];
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if (thread != my_thread &&
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(!GC_use_mach_handler_thread ||
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(GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
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for(j = 0; j < GC_mach_threads_count; j++) {
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if (thread == GC_mach_threads[j].thread) {
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if (GC_mach_threads[j].already_suspended) {
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# if DEBUG_THREADS
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GC_printf1("Not resuming already suspended thread %p\n", thread);
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# endif
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continue;
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}
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struct thread_basic_info info;
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mach_msg_type_number_t outCount = THREAD_INFO_MAX;
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kern_result = thread_info(thread, THREAD_BASIC_INFO,
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(thread_info_t)&info, &outCount);
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if(kern_result != KERN_SUCCESS) ABORT("thread_info failed");
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# if DEBUG_THREADS
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GC_printf2("Thread state for 0x%lx = %d\n", thread,
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info.run_state);
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GC_printf1("Resuming 0x%lx\n", thread);
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# endif
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/* Resume the thread */
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kern_result = thread_resume(thread);
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if(kern_result != KERN_SUCCESS) ABORT("thread_resume failed");
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}
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}
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}
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}
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# if DEBUG_THREADS
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GC_printf0("World started\n");
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# endif
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}
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void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
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GC_mach_handler_thread = thread;
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GC_use_mach_handler_thread = 1;
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}
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#endif
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