// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <string.h> /* for strerror */
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#include <pthread.h>
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#include <signal.h>
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#include "libcgo.h"
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static void* threadentry(void*);
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static pthread_key_t k1;
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#define magic1 (0x23581321345589ULL)
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static void
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inittls(void)
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{
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uint64 x;
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pthread_key_t tofree[128], k;
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int i, ntofree;
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/*
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* Same logic, code as gcc_darwin_386.c:/inittls.
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* Note that this is a temporary hack that should be fixed soon.
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* Android-L and M bionic's pthread implementation differ
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* significantly, and can change any time.
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* https://android-review.googlesource.com/#/c/134202
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*
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* We chose %fs:0x1d0 which seems to work in testing with Android
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* emulators (API22, API23) but it may break any time.
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*
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* TODO: fix this.
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*
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* The linker and runtime hard-code this constant offset
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* from %fs where we expect to find g. Disgusting.
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*
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* Known to src/cmd/link/internal/ld/sym.go:/0x1d0
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* and to src/runtime/sys_linux_amd64.s:/0x1d0 or /GOOS_android.
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*
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* As disgusting as on the darwin/386, darwin/amd64.
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*/
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ntofree = 0;
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for(;;) {
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if(pthread_key_create(&k, nil) != 0) {
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fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
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abort();
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}
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pthread_setspecific(k, (void*)magic1);
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asm volatile("movq %%fs:0x1d0, %0" : "=r"(x));
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pthread_setspecific(k, 0);
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if(x == magic1) {
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k1 = k;
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break;
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}
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if(ntofree >= nelem(tofree)) {
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fprintf(stderr, "runtime/cgo: could not obtain pthread_keys\n");
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fprintf(stderr, "\ttried");
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for(i=0; i<ntofree; i++)
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fprintf(stderr, " %#x", (unsigned)tofree[i]);
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fprintf(stderr, "\n");
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abort();
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}
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tofree[ntofree++] = k;
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}
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// TODO: output to stderr is not useful for apps.
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// Can we fall back to Android's log library?
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/*
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* We got the key we wanted. Free the others.
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*/
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for(i=0; i<ntofree; i++) {
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pthread_key_delete(tofree[i]);
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}
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}
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static void*
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threadentry(void *v)
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{
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ThreadStart ts;
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ts = *(ThreadStart*)v;
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free(v);
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if (pthread_setspecific(k1, (void*)ts.g) != 0) {
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fprintf(stderr, "runtime/cgo: pthread_setspecific failed\n");
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abort();
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}
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crosscall_amd64(ts.fn);
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return nil;
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}
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void (*x_cgo_inittls)(void) = inittls;
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void* (*x_cgo_threadentry)(void*) = threadentry;
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