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runtime/cgo: define x_cgo_inittls() for android/arm64.

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On android, runtime.tls_g is a normal variable.
TLS offset is computed in x_cgo_inittls.

Change-Id: I64cfd3543040776dcdf73cad8dba54fc6aaf6f35
Reviewed-on: https://go-review.googlesource.com/17245
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Rahul Chaudhry 2015-11-25 17:31:57 -08:00 committed by Ian Lance Taylor
parent 3a1bed82a6
commit 4480d6a927
1 changed files with 38 additions and 0 deletions
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38
src/runtime/cgo/gcc_android_arm64.c Normal file
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// Copyright 2015 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 <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <sys/limits.h>
#include "libcgo.h"
#define magic1 (0x23581321345589ULL)
// inittls allocates a thread-local storage slot for g.
//
// It finds the first available slot using pthread_key_create and uses
// it as the offset value for runtime.tlsg.
static void
inittls(void **tlsg, void **tlsbase)
{
pthread_key_t k;
int i, err;
err = pthread_key_create(&k, nil);
if(err != 0) {
fatalf("pthread_key_create failed: %d", err);
}
pthread_setspecific(k, (void*)magic1);
for (i=0; i<PTHREAD_KEYS_MAX; i++) {
if (*(tlsbase+i) == (void*)magic1) {
*tlsg = (void*)(i*sizeof(void *));
pthread_setspecific(k, 0);
return;
}
}
fatalf("could not find pthread key");
}
void (*x_cgo_inittls)(void **tlsg, void **tlsbase) = inittls;