gcc_linux_s390x.c

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include <pthread.h>
     6  #include <string.h>
     7  #include <signal.h>
     8  #include "libcgo.h"
     9  #include "libcgo_unix.h"
    10  
    11  static void *threadentry(void*);
    12  
    13  void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    14  static void (*setg_gcc)(void*);
    15  
    16  void
    17  x_cgo_init(G *g, void (*setg)(void*), void **tlsbase)
    18  {
    19  	pthread_attr_t attr;
    20  	size_t size;
    21  
    22  	setg_gcc = setg;
    23  	pthread_attr_init(&attr);
    24  	pthread_attr_getstacksize(&attr, &size);
    25  	g->stacklo = (uintptr)&attr - size + 4096;
    26  	pthread_attr_destroy(&attr);
    27  }
    28  
    29  void
    30  _cgo_sys_thread_start(ThreadStart *ts)
    31  {
    32  	pthread_attr_t attr;
    33  	sigset_t ign, oset;
    34  	pthread_t p;
    35  	size_t size;
    36  	int err;
    37  
    38  	sigfillset(&ign);
    39  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    40  
    41  	pthread_attr_init(&attr);
    42  	pthread_attr_getstacksize(&attr, &size);
    43  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    44  	ts->g->stackhi = size;
    45  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    46  
    47  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    48  
    49  	if (err != 0) {
    50  		fatalf("pthread_create failed: %s", strerror(err));
    51  	}
    52  }
    53  
    54  extern void crosscall_s390x(void (*fn)(void), void *g);
    55  
    56  static void*
    57  threadentry(void *v)
    58  {
    59  	ThreadStart ts;
    60  
    61  	ts = *(ThreadStart*)v;
    62  	free(v);
    63  
    64  	// Save g for this thread in C TLS
    65  	setg_gcc((void*)ts.g);
    66  
    67  	crosscall_s390x(ts.fn, (void*)ts.g);
    68  	return nil;
    69  }
    70
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