mirror of
https://github.com/golang/go.git
synced 2025-12-08 06:10:04 +00:00
1d10b17589
We're going to need a different TLS offset for Android Q, so the static offsets used for 386 and amd64 are no longer viable on Android. Introduce runtime·tls_g and use that for indexing into TLS storage. As an added benefit, we can then merge the TLS setup code for all android GOARCHs. While we're at it, remove a bunch of android special cases no longer needed. Updates #29674 Updates #29249 (perhaps fixes it) Change-Id: I77c7385aec7de8f1f6a4da7c9c79999157e39572 Reviewed-on: https://go-review.googlesource.com/c/go/+/169817 TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
// Copyright 2009 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 <errno.h>
|
|
#include <string.h> // strerror
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include "libcgo.h"
|
|
#include "libcgo_unix.h"
|
|
|
|
static void* threadentry(void*);
|
|
static void (*setg_gcc)(void*);
|
|
|
|
// This will be set in gcc_android.c for android-specific customization.
|
|
void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
|
|
|
|
void
|
|
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
|
|
{
|
|
pthread_attr_t *attr;
|
|
size_t size;
|
|
|
|
/* The memory sanitizer distributed with versions of clang
|
|
before 3.8 has a bug: if you call mmap before malloc, mmap
|
|
may return an address that is later overwritten by the msan
|
|
library. Avoid this problem by forcing a call to malloc
|
|
here, before we ever call malloc.
|
|
|
|
This is only required for the memory sanitizer, so it's
|
|
unfortunate that we always run it. It should be possible
|
|
to remove this when we no longer care about versions of
|
|
clang before 3.8. The test for this is
|
|
misc/cgo/testsanitizers.
|
|
|
|
GCC works hard to eliminate a seemingly unnecessary call to
|
|
malloc, so we actually use the memory we allocate. */
|
|
|
|
setg_gcc = setg;
|
|
attr = (pthread_attr_t*)malloc(sizeof *attr);
|
|
if (attr == NULL) {
|
|
fatalf("malloc failed: %s", strerror(errno));
|
|
}
|
|
pthread_attr_init(attr);
|
|
pthread_attr_getstacksize(attr, &size);
|
|
g->stacklo = (uintptr)&size - size + 4096;
|
|
pthread_attr_destroy(attr);
|
|
free(attr);
|
|
|
|
if (x_cgo_inittls) {
|
|
x_cgo_inittls(tlsg, tlsbase);
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
pthread_attr_init(&attr);
|
|
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) {
|
|
fatalf("pthread_create failed: %s", strerror(err));
|
|
}
|
|
}
|
|
|
|
static void*
|
|
threadentry(void *v)
|
|
{
|
|
ThreadStart ts;
|
|
|
|
ts = *(ThreadStart*)v;
|
|
_cgo_tsan_acquire();
|
|
free(v);
|
|
_cgo_tsan_release();
|
|
|
|
/*
|
|
* Set specific keys.
|
|
*/
|
|
setg_gcc((void*)ts.g);
|
|
|
|
crosscall_amd64(ts.fn);
|
|
return nil;
|
|
}
|