source: libcfa/src/concurrency/kernel/startup.cfa @ dd92fe9

arm-ehenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since dd92fe9 was dd92fe9, checked in by Peter A. Buhr <pabuhr@…>, 2 years ago

switch to page_size and map_prot

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1//
2// Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// kernel/startup.cfa --
8//
9// Author           : Thierry Delisle
10// Created On       : Thu Jul 30 15:12:54 2020
11// Last Modified By :
12// Last Modified On :
13// Update Count     :
14//
15
16#define __cforall_thread__
17
18// C Includes
19#include <errno.h>              // errno
20#include <string.h>             // strerror
21#include <unistd.h>             // sysconf
22extern "C" {
23      #include <limits.h>       // PTHREAD_STACK_MIN
24      #include <sys/mman.h>     // mprotect
25      #include <sys/resource.h> // getrlimit
26}
27
28// CFA Includes
29#include "kernel_private.hfa"
30#include "startup.hfa"          // STARTUP_PRIORITY_XXX
31#include "math.hfa"
32
33#define CFA_PROCESSOR_USE_MMAP 0
34
35//-----------------------------------------------------------------------------
36// Some assembly required
37#if defined( __i386 )
38        #define CtxGet( ctx ) __asm__ volatile ( \
39                "movl %%esp,%0\n" \
40                "movl %%ebp,%1\n" \
41                : "=rm" (ctx.SP), \
42                  "=rm" (ctx.FP) \
43        )
44#elif defined( __x86_64 )
45        #define CtxGet( ctx ) __asm__ volatile ( \
46                "movq %%rsp,%0\n" \
47                "movq %%rbp,%1\n" \
48                : "=rm" (ctx.SP), \
49                  "=rm" (ctx.FP) \
50        )
51#elif defined( __aarch64__ )
52        #define CtxGet( ctx ) __asm__ volatile ( \
53                "mov %0, sp\n" \
54                "mov %1, fp\n" \
55                : "=rm" (ctx.SP), \
56                  "=rm" (ctx.FP) \
57        )
58#else
59        #error unknown hardware architecture
60#endif
61
62//-----------------------------------------------------------------------------
63// Start and stop routine for the kernel, declared first to make sure they run first
64static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) ));
65static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) ));
66
67//-----------------------------------------------------------------------------
68// Static Forward Declarations
69struct current_stack_info_t;
70
71static void * __invoke_processor(void * arg);
72static void __kernel_first_resume( processor * this );
73static void __kernel_last_resume ( processor * this );
74static void init(processor & this, const char name[], cluster & _cltr);
75static void deinit(processor & this);
76static void doregister( struct cluster & cltr );
77static void unregister( struct cluster & cltr );
78static void ?{}( $coroutine & this, current_stack_info_t * info);
79static void ?{}( $thread & this, current_stack_info_t * info);
80static void ?{}(processorCtx_t & this) {}
81static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info);
82
83#if defined(__CFA_WITH_VERIFY__)
84        static bool verify_fwd_bck_rng(void);
85#endif
86
87//-----------------------------------------------------------------------------
88// Forward Declarations for other modules
89extern void __kernel_alarm_startup(void);
90extern void __kernel_alarm_shutdown(void);
91extern void __kernel_io_startup (void);
92extern void __kernel_io_shutdown(void);
93
94//-----------------------------------------------------------------------------
95// Other Forward Declarations
96extern void __wake_proc(processor *);
97
98//-----------------------------------------------------------------------------
99// Kernel storage
100KERNEL_STORAGE(cluster,              mainCluster);
101KERNEL_STORAGE(processor,            mainProcessor);
102KERNEL_STORAGE($thread,              mainThread);
103KERNEL_STORAGE(__stack_t,            mainThreadCtx);
104KERNEL_STORAGE(io_context,           mainPollerThread);
105KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock);
106#if !defined(__CFA_NO_STATISTICS__)
107KERNEL_STORAGE(__stats_t, mainProcStats);
108#endif
109
110cluster              * mainCluster;
111processor            * mainProcessor;
112$thread              * mainThread;
113__scheduler_RWLock_t * __scheduler_lock;
114
115extern "C" {
116        struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters;
117}
118
119extern size_t __page_size;
120
121//-----------------------------------------------------------------------------
122// Global state
123thread_local struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= {
124        NULL,                                                                                           // cannot use 0p
125        NULL,
126        NULL,
127        NULL,
128        { 1, false, false },
129};
130
131//-----------------------------------------------------------------------------
132// Struct to steal stack
133struct current_stack_info_t {
134        __stack_t * storage;  // pointer to stack object
135        void * base;          // base of stack
136        void * limit;         // stack grows towards stack limit
137        void * context;       // address of cfa_context_t
138};
139
140void ?{}( current_stack_info_t & this ) {
141        __stack_context_t ctx;
142        CtxGet( ctx );
143        this.base = ctx.FP;
144
145        rlimit r;
146        getrlimit( RLIMIT_STACK, &r);
147        size_t size = r.rlim_cur;
148
149        this.limit = (void *)(((intptr_t)this.base) - size);
150        this.context = &storage_mainThreadCtx;
151}
152
153
154
155//=============================================================================================
156// Kernel Setup logic
157//=============================================================================================
158//-----------------------------------------------------------------------------
159// Kernel boot procedures
160static void __kernel_startup(void) {
161        /* paranoid */ verify( ! __preemption_enabled() );
162        __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
163
164        __cfa_dbg_global_clusters.list{ __get };
165        __cfa_dbg_global_clusters.lock{};
166
167        /* paranoid */ verify( verify_fwd_bck_rng() );
168
169        // Initialize the global scheduler lock
170        __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
171        (*__scheduler_lock){};
172
173        // Initialize the main cluster
174        mainCluster = (cluster *)&storage_mainCluster;
175        (*mainCluster){"Main Cluster", 0};
176
177        __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
178
179        // Start by initializing the main thread
180        // SKULLDUGGERY: the mainThread steals the process main thread
181        // which will then be scheduled by the mainProcessor normally
182        mainThread = ($thread *)&storage_mainThread;
183        current_stack_info_t info;
184        info.storage = (__stack_t*)&storage_mainThreadCtx;
185        (*mainThread){ &info };
186
187        __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
188
189
190
191        // Construct the processor context of the main processor
192        void ?{}(processorCtx_t & this, processor * proc) {
193                (this.__cor){ "Processor" };
194                this.__cor.starter = 0p;
195                this.proc = proc;
196        }
197
198        void ?{}(processor & this) with( this ) {
199                ( this.idle ){};
200                ( this.terminated ){ 0 };
201                ( this.runner ){};
202                init( this, "Main Processor", *mainCluster );
203                kernel_thread = pthread_self();
204
205                runner{ &this };
206                __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
207        }
208
209        // Initialize the main processor and the main processor ctx
210        // (the coroutine that contains the processing control flow)
211        mainProcessor = (processor *)&storage_mainProcessor;
212        (*mainProcessor){};
213
214        //initialize the global state variables
215        __cfaabi_tls.this_processor = mainProcessor;
216        __cfaabi_tls.this_proc_id   = (__processor_id_t*)mainProcessor;
217        __cfaabi_tls.this_thread    = mainThread;
218
219        #if !defined( __CFA_NO_STATISTICS__ )
220                __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats;
221                __init_stats( __cfaabi_tls.this_stats );
222        #endif
223
224        // Enable preemption
225        __kernel_alarm_startup();
226
227        // Start IO
228        __kernel_io_startup();
229
230        // Add the main thread to the ready queue
231        // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
232        __schedule_thread(mainThread);
233
234        // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
235        // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
236        // mainThread is on the ready queue when this call is made.
237        __kernel_first_resume( __cfaabi_tls.this_processor );
238
239
240        // THE SYSTEM IS NOW COMPLETELY RUNNING
241
242
243        // SKULLDUGGERY: The constructor for the mainCluster will call alloc with a dimension of 0
244        // malloc *can* return a non-null value, we should free it if that is the case
245        free( mainCluster->io.ctxs );
246
247        // Now that the system is up, finish creating systems that need threading
248        mainCluster->io.ctxs = (io_context *)&storage_mainPollerThread;
249        mainCluster->io.cnt  = 1;
250        (*mainCluster->io.ctxs){ *mainCluster };
251
252        __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
253
254        /* paranoid */ verify( ! __preemption_enabled() );
255        enable_interrupts( __cfaabi_dbg_ctx );
256        /* paranoid */ verify( __preemption_enabled() );
257
258}
259
260static void __kernel_shutdown(void) {
261        //Before we start shutting things down, wait for systems that need threading to shutdown
262        ^(*mainCluster->io.ctxs){};
263        mainCluster->io.cnt  = 0;
264        mainCluster->io.ctxs = 0p;
265
266        /* paranoid */ verify( __preemption_enabled() );
267        disable_interrupts();
268        /* paranoid */ verify( ! __preemption_enabled() );
269
270        __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
271
272        // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
273        // When its coroutine terminates, it return control to the mainThread
274        // which is currently here
275        __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
276        __kernel_last_resume( __cfaabi_tls.this_processor );
277        mainThread->self_cor.state = Halted;
278
279        // THE SYSTEM IS NOW COMPLETELY STOPPED
280
281        // Disable preemption
282        __kernel_alarm_shutdown();
283
284        // Stop IO
285        __kernel_io_shutdown();
286
287        // Destroy the main processor and its context in reverse order of construction
288        // These were manually constructed so we need manually destroy them
289        void ^?{}(processor & this) with( this ){
290                deinit( this );
291
292                /* paranoid */ verify( this.do_terminate == true );
293                __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner);
294        }
295
296        ^(*mainProcessor){};
297
298        // Final step, destroy the main thread since it is no longer needed
299
300        // Since we provided a stack to this taxk it will not destroy anything
301        /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
302        ^(*mainThread){};
303
304        ^(*mainCluster){};
305
306        ^(*__scheduler_lock){};
307
308        ^(__cfa_dbg_global_clusters.list){};
309        ^(__cfa_dbg_global_clusters.lock){};
310
311        __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
312}
313
314//=============================================================================================
315// Kernel Initial Scheduling logic
316//=============================================================================================
317
318// Context invoker for processors
319// This is the entry point for processors (kernel threads) *except* for the main processor
320// It effectively constructs a coroutine by stealing the pthread stack
321static void * __invoke_processor(void * arg) {
322        #if !defined( __CFA_NO_STATISTICS__ )
323                __stats_t local_stats;
324                __init_stats( &local_stats );
325                __cfaabi_tls.this_stats = &local_stats;
326        #endif
327
328        processor * proc = (processor *) arg;
329        __cfaabi_tls.this_processor = proc;
330        __cfaabi_tls.this_proc_id   = (__processor_id_t*)proc;
331        __cfaabi_tls.this_thread    = 0p;
332        __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1];
333        // SKULLDUGGERY: We want to create a context for the processor coroutine
334        // which is needed for the 2-step context switch. However, there is no reason
335        // to waste the perfectly valid stack create by pthread.
336        current_stack_info_t info;
337        __stack_t ctx;
338        info.storage = &ctx;
339        (proc->runner){ proc, &info };
340
341        __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
342
343        //Set global state
344        __cfaabi_tls.this_thread = 0p;
345
346        //We now have a proper context from which to schedule threads
347        __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
348
349        // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
350        // resume it to start it like it normally would, it will just context switch
351        // back to here. Instead directly call the main since we already are on the
352        // appropriate stack.
353        get_coroutine(proc->runner)->state = Active;
354        main( proc->runner );
355        get_coroutine(proc->runner)->state = Halted;
356
357        // Main routine of the core returned, the core is now fully terminated
358        __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
359
360        #if !defined(__CFA_NO_STATISTICS__)
361                __tally_stats(proc->cltr->stats, &local_stats);
362                if( 0 != proc->print_stats ) {
363                        __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc );
364                }
365        #endif
366
367        return 0p;
368}
369
370static void __kernel_first_resume( processor * this ) {
371        $thread * src = mainThread;
372        $coroutine * dst = get_coroutine(this->runner);
373
374        /* paranoid */ verify( ! __preemption_enabled() );
375
376        __cfaabi_tls.this_thread->curr_cor = dst;
377        __stack_prepare( &dst->stack, 65000 );
378        __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
379
380        /* paranoid */ verify( ! __preemption_enabled() );
381
382        dst->last = &src->self_cor;
383        dst->starter = dst->starter ? dst->starter : &src->self_cor;
384
385        // make sure the current state is still correct
386        /* paranoid */ verify(src->state == Ready);
387
388        // context switch to specified coroutine
389        verify( dst->context.SP );
390        __cfactx_switch( &src->context, &dst->context );
391        // when __cfactx_switch returns we are back in the src coroutine
392
393        mainThread->curr_cor = &mainThread->self_cor;
394
395        // make sure the current state has been update
396        /* paranoid */ verify(src->state == Active);
397
398        /* paranoid */ verify( ! __preemption_enabled() );
399}
400
401// KERNEL_ONLY
402static void __kernel_last_resume( processor * this ) {
403        $coroutine * src = &mainThread->self_cor;
404        $coroutine * dst = get_coroutine(this->runner);
405
406        /* paranoid */ verify( ! __preemption_enabled() );
407        /* paranoid */ verify( dst->starter == src );
408        /* paranoid */ verify( dst->context.SP );
409
410        // SKULLDUGGERY in debug the processors check that the
411        // stack is still within the limit of the stack limits after running a thread.
412        // that check doesn't make sense if we context switch to the processor using the
413        // coroutine semantics. Since this is a special case, use the current context
414        // info to populate these fields.
415        __cfaabi_dbg_debug_do(
416                __stack_context_t ctx;
417                CtxGet( ctx );
418                mainThread->context.SP = ctx.SP;
419                mainThread->context.FP = ctx.FP;
420        )
421
422        // context switch to the processor
423        __cfactx_switch( &src->context, &dst->context );
424}
425
426
427//=============================================================================================
428// Kernel Object Constructors logic
429//=============================================================================================
430//-----------------------------------------------------------------------------
431// Main thread construction
432static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) {
433        stack.storage = info->storage;
434        with(*stack.storage) {
435                limit     = info->limit;
436                base      = info->base;
437        }
438        __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
439        *istorage |= 0x1;
440        name = "Main Thread";
441        state = Start;
442        starter = 0p;
443        last = 0p;
444        cancellation = 0p;
445}
446
447static void ?{}( $thread & this, current_stack_info_t * info) with( this ) {
448        ticket = TICKET_RUNNING;
449        state = Start;
450        self_cor{ info };
451        curr_cor = &self_cor;
452        curr_cluster = mainCluster;
453        self_mon.owner = &this;
454        self_mon.recursion = 1;
455        self_mon_p = &self_mon;
456        link.next = 0p;
457        link.prev = 0p;
458        #if defined( __CFA_WITH_VERIFY__ )
459                canary = 0x0D15EA5E0D15EA5Ep;
460        #endif
461
462        node.next = 0p;
463        node.prev = 0p;
464        doregister(curr_cluster, this);
465
466        monitors{ &self_mon_p, 1, (fptr_t)0 };
467}
468
469//-----------------------------------------------------------------------------
470// Processor
471// Construct the processor context of non-main processors
472static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
473        (this.__cor){ info };
474        this.proc = proc;
475}
476
477static void init(processor & this, const char name[], cluster & _cltr) with( this ) {
478        this.name = name;
479        this.cltr = &_cltr;
480        full_proc = true;
481        do_terminate = false;
482        preemption_alarm = 0p;
483        pending_preemption = false;
484
485        #if !defined(__CFA_NO_STATISTICS__)
486                print_stats = 0;
487                print_halts = false;
488        #endif
489
490        lock( this.cltr->idles );
491                int target = this.cltr->idles.total += 1u;
492        unlock( this.cltr->idles );
493
494        id = doregister((__processor_id_t*)&this);
495
496        // Lock the RWlock so no-one pushes/pops while we are changing the queue
497        uint_fast32_t last_size = ready_mutate_lock();
498
499                // Adjust the ready queue size
500                ready_queue_grow( cltr, target );
501
502        // Unlock the RWlock
503        ready_mutate_unlock( last_size );
504
505        __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
506}
507
508// Not a ctor, it just preps the destruction but should not destroy members
509static void deinit(processor & this) {
510        lock( this.cltr->idles );
511                int target = this.cltr->idles.total -= 1u;
512        unlock( this.cltr->idles );
513
514        // Lock the RWlock so no-one pushes/pops while we are changing the queue
515        uint_fast32_t last_size = ready_mutate_lock();
516
517                // Adjust the ready queue size
518                ready_queue_shrink( this.cltr, target );
519
520        // Unlock the RWlock
521        ready_mutate_unlock( last_size );
522
523        // Finally we don't need the read_lock any more
524        unregister((__processor_id_t*)&this);
525}
526
527void ?{}(processor & this, const char name[], cluster & _cltr) {
528        ( this.idle ){};
529        ( this.terminated ){ 0 };
530        ( this.runner ){};
531
532        disable_interrupts();
533                init( this, name, _cltr );
534        enable_interrupts( __cfaabi_dbg_ctx );
535
536        __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
537
538        this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
539
540}
541
542extern size_t __page_size;
543void ^?{}(processor & this) with( this ){
544        if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) {
545                __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
546
547                __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
548                __wake_proc( &this );
549
550                P( terminated );
551                /* paranoid */ verify( active_processor() != &this);
552        }
553
554        __destroy_pthread( kernel_thread, this.stack, 0p );
555
556        disable_interrupts();
557                deinit( this );
558        enable_interrupts( __cfaabi_dbg_ctx );
559}
560
561//-----------------------------------------------------------------------------
562// Cluster
563static void ?{}(__cluster_idles & this) {
564        this.lock  = 0;
565        this.idle  = 0;
566        this.total = 0;
567        (this.list){};
568}
569
570void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) {
571        this.name = name;
572        this.preemption_rate = preemption_rate;
573        ready_queue{};
574
575        #if !defined(__CFA_NO_STATISTICS__)
576                print_stats = 0;
577                stats = alloc();
578                __init_stats( stats );
579        #endif
580
581        threads{ __get };
582
583        doregister(this);
584
585        // Lock the RWlock so no-one pushes/pops while we are changing the queue
586        disable_interrupts();
587        uint_fast32_t last_size = ready_mutate_lock();
588
589                // Adjust the ready queue size
590                ready_queue_grow( &this, 0 );
591
592        // Unlock the RWlock
593        ready_mutate_unlock( last_size );
594        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
595
596
597        this.io.cnt  = num_io;
598        this.io.ctxs = aalloc(num_io);
599        for(i; this.io.cnt) {
600                (this.io.ctxs[i]){ this, io_params };
601        }
602}
603
604void ^?{}(cluster & this) {
605        for(i; this.io.cnt) {
606                ^(this.io.ctxs[i]){ true };
607        }
608        free(this.io.ctxs);
609
610        // Lock the RWlock so no-one pushes/pops while we are changing the queue
611        disable_interrupts();
612        uint_fast32_t last_size = ready_mutate_lock();
613
614                // Adjust the ready queue size
615                ready_queue_shrink( &this, 0 );
616
617        // Unlock the RWlock
618        ready_mutate_unlock( last_size );
619        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
620
621        #if !defined(__CFA_NO_STATISTICS__)
622                if( 0 != this.print_stats ) {
623                        __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this );
624                }
625                free( this.stats );
626        #endif
627
628        unregister(this);
629}
630
631//=============================================================================================
632// Miscellaneous Initialization
633//=============================================================================================
634//-----------------------------------------------------------------------------
635// Global Queues
636static void doregister( cluster     & cltr ) {
637        lock      ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
638        push_front( __cfa_dbg_global_clusters.list, cltr );
639        unlock    ( __cfa_dbg_global_clusters.lock );
640}
641
642static void unregister( cluster     & cltr ) {
643        lock  ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
644        remove( __cfa_dbg_global_clusters.list, cltr );
645        unlock( __cfa_dbg_global_clusters.lock );
646}
647
648void doregister( cluster * cltr, $thread & thrd ) {
649        lock      (cltr->thread_list_lock __cfaabi_dbg_ctx2);
650        cltr->nthreads += 1;
651        push_front(cltr->threads, thrd);
652        unlock    (cltr->thread_list_lock);
653}
654
655void unregister( cluster * cltr, $thread & thrd ) {
656        lock  (cltr->thread_list_lock __cfaabi_dbg_ctx2);
657        remove(cltr->threads, thrd );
658        cltr->nthreads -= 1;
659        unlock(cltr->thread_list_lock);
660}
661
662static void check( int ret, const char func[] ) {
663        if ( ret ) {                                                                            // pthread routines return errno values
664                abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
665        } // if
666} // Abort
667
668void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
669        pthread_attr_t attr;
670
671        check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
672
673        size_t stacksize;
674        // default stack size, normally defined by shell limit
675        check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
676        assert( stacksize >= PTHREAD_STACK_MIN );
677
678        void * stack;
679        #if CFA_PROCESSOR_USE_MMAP
680                stacksize = ceiling( stacksize, __page_size ) + __page_size;
681                stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
682                if(stack == ((void*)-1)) {
683                        abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );
684                }
685                if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
686                        abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
687                } // if
688        #else
689                __cfaabi_dbg_debug_do(
690                        stack = memalign( __page_size, stacksize + __page_size );
691                        // pthread has no mechanism to create the guard page in user supplied stack.
692                        if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
693                                abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
694                        } // if
695                );
696                __cfaabi_dbg_no_debug_do(
697                        stack = malloc( stacksize );
698                );
699        #endif
700
701
702        check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
703
704        check( pthread_create( pthread, &attr, start, arg ), "pthread_create" );
705        return stack;
706}
707
708void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) {
709        int err = pthread_join( pthread, retval );
710        if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err));
711
712        #if CFA_PROCESSOR_USE_MMAP
713                pthread_attr_t attr;
714
715                check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
716
717                size_t stacksize;
718                // default stack size, normally defined by shell limit
719                check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
720                assert( stacksize >= PTHREAD_STACK_MIN );
721                stacksize += __page_size;
722
723                if(munmap(stack, stacksize) == -1) {
724                        abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) );
725                }
726        #else
727                free( stack );
728        #endif
729}
730
731
732#if defined(__CFA_WITH_VERIFY__)
733static bool verify_fwd_bck_rng(void) {
734        __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
735
736        unsigned values[10];
737        for(i; 10) {
738                values[i] = __tls_rand_fwd();
739        }
740
741        __tls_rand_advance_bck();
742
743        for ( i; 9 -~= 0 ) {
744                if(values[i] != __tls_rand_bck()) {
745                        return false;
746                }
747        }
748
749        return true;
750}
751#endif
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