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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <sys/types.h>
#include <machine/sysarch.h>
#include <sys/signalvar.h>
#include <pthread.h>
#include <signal.h>
#include <string.h>
#include "libcgo.h"
#include "libcgo_unix.h"
#ifdef ARM_TP_ADDRESS
// ARM_TP_ADDRESS is (ARM_VECTORS_HIGH + 0x1000) or 0xffff1000
// and is known to runtime.read_tls_fallback. Verify it with
// cpp.
#if ARM_TP_ADDRESS != 0xffff1000
#error Wrong ARM_TP_ADDRESS!
#endif
#endif
static void *threadentry(void*);
static void (*setg_gcc)(void*);
void
x_cgo_init(G *g, void (*setg)(void*))
{
pthread_attr_t attr;
size_t size;
setg_gcc = setg;
pthread_attr_init(&attr);
pthread_attr_getstacksize(&attr, &size);
g->stacklo = (uintptr)&attr - size + 4096;
pthread_attr_destroy(&attr);
}
void
_cgo_sys_thread_start(ThreadStart *ts)
{
pthread_attr_t attr;
sigset_t ign, oset;
pthread_t p;
size_t size;
int err;
SIGFILLSET(ign);
pthread_sigmask(SIG_SETMASK, &ign, &oset);
// Not sure why the memset is necessary here,
// but without it, we get a bogus stack size
// out of pthread_attr_getstacksize. C'est la Linux.
memset(&attr, 0, sizeof attr);
pthread_attr_init(&attr);
size = 0;
pthread_attr_getstacksize(&attr, &size);
// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
ts->g->stackhi = size;
err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
pthread_sigmask(SIG_SETMASK, &oset, nil);
if (err != 0) {
fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
abort();
}
}
extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
ThreadStart ts;
ts = *(ThreadStart*)v;
free(v);
crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
return nil;
}
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