507 lines
16 KiB
C
507 lines
16 KiB
C
#include "private/pthread_support.h"
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/* This probably needs more porting work to ppc64. */
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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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#if defined(__ppc__)
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# define PPC_RED_ZONE_SIZE 224
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#elif defined(__ppc64__)
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# define PPC_RED_ZONE_SIZE 320
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#endif
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/* Try to work out the right way to access thread state structure members.
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The structure has changed its definition in different Darwin versions. */
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#if defined(__ppc__)
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# define THREAD_STATE ppc_thread_state_t
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# if defined (HAS_PPC_THREAD_STATE_R0)
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# define THREAD_FLD(x) x
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# elif defined (HAS_PPC_THREAD_STATE___R0)
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# define THREAD_FLD(x) __ ## x
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# else
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# error can not work out how to access fields of ppc_thread_state_t
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# endif
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#elif defined(__ppc64__)
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# define THREAD_STATE ppc_thread_state64_t
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# if defined (HAS_PPC_THREAD_STATE64_R0)
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# define THREAD_FLD(x) x
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# elif defined (HAS_PPC_THREAD_STATE64___R0)
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# define THREAD_FLD(x) __ ## x
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# else
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# error can not work out how to access fields of ppc_thread_state64_t
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# endif
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#elif defined(__i386__)
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# define THREAD_STATE i386_thread_state_t
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# if defined (HAS_I386_THREAD_STATE_EAX)
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# define THREAD_FLD(x) x
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# elif defined (HAS_I386_THREAD_STATE___EAX)
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# define THREAD_FLD(x) __ ## x
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# else
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# error can not work out how to access fields of i386_thread_state_t
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# endif
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#else
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# error unknown architecture
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#endif
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typedef struct StackFrame {
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unsigned long savedSP;
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unsigned long savedCR;
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unsigned long savedLR;
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unsigned long reserved[2];
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unsigned long savedRTOC;
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} StackFrame;
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unsigned long FindTopOfStack(unsigned int stack_start) {
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StackFrame *frame;
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if (stack_start == 0) {
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# ifdef POWERPC
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# if CPP_WORDSZ == 32
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__asm__ volatile("lwz %0,0(r1)" : "=r" (frame));
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# else
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__asm__ volatile("ld %0,0(r1)" : "=r" (frame));
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# endif
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# endif
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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 == 0) 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 long)frame;
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}
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#ifdef DARWIN_DONT_PARSE_STACK
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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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GC_thread p;
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pthread_t me;
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ptr_t lo, hi;
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THREAD_STATE state;
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mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
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me = pthread_self();
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if (!GC_thr_initialized) GC_thr_init();
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for(i=0;i<THREAD_TABLE_SZ;i++) {
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for(p=GC_threads[i];p!=0;p=p->next) {
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if(p -> flags & FINISHED) continue;
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if(pthread_equal(p->id,me)) {
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lo = GC_approx_sp();
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} else {
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/* Get the thread state (registers, etc) */
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r = thread_get_state(
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p->stop_info.mach_thread,
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MACHINE_THREAD_STATE,
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(natural_t*)&state,
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&thread_state_count);
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if(r != KERN_SUCCESS) ABORT("thread_get_state failed");
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lo = (void*)(state . THREAD_FLD (r1) - PPC_RED_ZONE_SIZE);
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GC_push_one(state . THREAD_FLD (r0));
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GC_push_one(state . THREAD_FLD (r2));
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GC_push_one(state . THREAD_FLD (r3));
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GC_push_one(state . THREAD_FLD (r4));
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GC_push_one(state . THREAD_FLD (r5));
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GC_push_one(state . THREAD_FLD (r6));
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GC_push_one(state . THREAD_FLD (r7));
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GC_push_one(state . THREAD_FLD (r8));
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GC_push_one(state . THREAD_FLD (r9));
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GC_push_one(state . THREAD_FLD (r10));
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GC_push_one(state . THREAD_FLD (r11));
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GC_push_one(state . THREAD_FLD (r12));
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GC_push_one(state . THREAD_FLD (r13));
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GC_push_one(state . THREAD_FLD (r14));
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GC_push_one(state . THREAD_FLD (r15));
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GC_push_one(state . THREAD_FLD (r16));
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GC_push_one(state . THREAD_FLD (r17));
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GC_push_one(state . THREAD_FLD (r18));
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GC_push_one(state . THREAD_FLD (r19));
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GC_push_one(state . THREAD_FLD (r20));
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GC_push_one(state . THREAD_FLD (r21));
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GC_push_one(state . THREAD_FLD (r22));
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GC_push_one(state . THREAD_FLD (r23));
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GC_push_one(state . THREAD_FLD (r24));
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GC_push_one(state . THREAD_FLD (r25));
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GC_push_one(state . THREAD_FLD (r26));
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GC_push_one(state . THREAD_FLD (r27));
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GC_push_one(state . THREAD_FLD (r28));
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GC_push_one(state . THREAD_FLD (r29));
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GC_push_one(state . THREAD_FLD (r30));
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GC_push_one(state . THREAD_FLD (r31));
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} /* p != me */
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if(p->flags & MAIN_THREAD)
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hi = GC_stackbottom;
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else
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hi = p->stack_end;
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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) p -> id,
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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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} /* for(i=0;i<THREAD_TABLE_SZ...) */
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}
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#else /* !DARWIN_DONT_PARSE_STACK; Use FindTopOfStack() */
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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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# if defined(__ppc__) || defined(__ppc64__)
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THREAD_STATE 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 . THREAD_FLD (r1) - PPC_RED_ZONE_SIZE);
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hi = (ptr_t)FindTopOfStack(info . THREAD_FLD (r1));
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GC_push_one(info . THREAD_FLD (r0));
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GC_push_one(info . THREAD_FLD (r2));
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GC_push_one(info . THREAD_FLD (r3));
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GC_push_one(info . THREAD_FLD (r4));
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GC_push_one(info . THREAD_FLD (r5));
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GC_push_one(info . THREAD_FLD (r6));
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GC_push_one(info . THREAD_FLD (r7));
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GC_push_one(info . THREAD_FLD (r8));
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GC_push_one(info . THREAD_FLD (r9));
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GC_push_one(info . THREAD_FLD (r10));
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GC_push_one(info . THREAD_FLD (r11));
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GC_push_one(info . THREAD_FLD (r12));
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GC_push_one(info . THREAD_FLD (r13));
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GC_push_one(info . THREAD_FLD (r14));
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GC_push_one(info . THREAD_FLD (r15));
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GC_push_one(info . THREAD_FLD (r16));
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GC_push_one(info . THREAD_FLD (r17));
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GC_push_one(info . THREAD_FLD (r18));
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GC_push_one(info . THREAD_FLD (r19));
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GC_push_one(info . THREAD_FLD (r20));
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GC_push_one(info . THREAD_FLD (r21));
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GC_push_one(info . THREAD_FLD (r22));
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GC_push_one(info . THREAD_FLD (r23));
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GC_push_one(info . THREAD_FLD (r24));
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GC_push_one(info . THREAD_FLD (r25));
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GC_push_one(info . THREAD_FLD (r26));
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GC_push_one(info . THREAD_FLD (r27));
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GC_push_one(info . THREAD_FLD (r28));
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GC_push_one(info . THREAD_FLD (r29));
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GC_push_one(info . THREAD_FLD (r30));
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GC_push_one(info . THREAD_FLD (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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THREAD_STATE 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 . THREAD_FLD (esp);
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hi = (ptr_t)FindTopOfStack(info . THREAD_FLD (esp));
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GC_push_one(info . THREAD_FLD (eax));
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GC_push_one(info . THREAD_FLD (ebx));
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GC_push_one(info . THREAD_FLD (ecx));
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GC_push_one(info . THREAD_FLD (edx));
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GC_push_one(info . THREAD_FLD (edi));
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GC_push_one(info . THREAD_FLD (esi));
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/* GC_push_one(info . THREAD_FLD (ebp)); */
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/* GC_push_one(info . THREAD_FLD (esp)); */
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GC_push_one(info . THREAD_FLD (ss));
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GC_push_one(info . THREAD_FLD (eip));
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GC_push_one(info . THREAD_FLD (cs));
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GC_push_one(info . THREAD_FLD (ds));
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GC_push_one(info . THREAD_FLD (es));
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GC_push_one(info . THREAD_FLD (fs));
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GC_push_one(info . THREAD_FLD (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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vm_deallocate(current_task(), (vm_address_t)act_list, sizeof(thread_t) * listcount);
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}
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#endif /* !DARWIN_DONT_PARSE_STACK */
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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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vm_deallocate(current_task(), (vm_address_t)act_list, sizeof(thread_t) * 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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struct thread_basic_info info;
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mach_msg_type_number_t outCount = THREAD_INFO_MAX;
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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) {
|
|
extern void GC_mprotect_resume();
|
|
GC_mprotect_resume();
|
|
}
|
|
# endif
|
|
|
|
kern_result = task_threads(current_task(), &act_list, &listcount);
|
|
for(i = 0; i < listcount; i++) {
|
|
thread_act_t thread = act_list[i];
|
|
if (thread != my_thread &&
|
|
(!GC_use_mach_handler_thread ||
|
|
(GC_use_mach_handler_thread && GC_mach_handler_thread != thread))) {
|
|
for(j = 0; j < GC_mach_threads_count; j++) {
|
|
if (thread == GC_mach_threads[j].thread) {
|
|
if (GC_mach_threads[j].already_suspended) {
|
|
# if DEBUG_THREADS
|
|
GC_printf1("Not resuming already suspended thread %p\n", thread);
|
|
# endif
|
|
continue;
|
|
}
|
|
kern_result = thread_info(thread, THREAD_BASIC_INFO,
|
|
(thread_info_t)&info, &outCount);
|
|
if(kern_result != KERN_SUCCESS) ABORT("thread_info failed");
|
|
# if DEBUG_THREADS
|
|
GC_printf2("Thread state for 0x%lx = %d\n", thread,
|
|
info.run_state);
|
|
GC_printf1("Resuming 0x%lx\n", thread);
|
|
# endif
|
|
/* Resume the thread */
|
|
kern_result = thread_resume(thread);
|
|
if(kern_result != KERN_SUCCESS) ABORT("thread_resume failed");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
vm_deallocate(current_task(), (vm_address_t)act_list, sizeof(thread_t) * listcount);
|
|
# if DEBUG_THREADS
|
|
GC_printf0("World started\n");
|
|
# endif
|
|
}
|
|
|
|
void GC_darwin_register_mach_handler_thread(mach_port_t thread) {
|
|
GC_mach_handler_thread = thread;
|
|
GC_use_mach_handler_thread = 1;
|
|
}
|
|
|
|
#endif
|