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// 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 <string.h>
#include "libcgo.h"
static void *threadentry(void*);
static void
xinitcgo(void)
{
}
void (*initcgo) = xinitcgo;
void
libcgo_sys_thread_start(ThreadStart *ts)
{
pthread_attr_t attr;
pthread_t p;
size_t size;
// 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);
ts->g->stackguard = size;
pthread_create(&p, &attr, threadentry, ts);
}
static void*
threadentry(void *v)
{
ThreadStart ts;
ts = *(ThreadStart*)v;
free(v);
ts.g->stackbase = (uintptr)&ts;
/*
* libcgo_sys_thread_start set stackguard to stack size;
* change to actual guard pointer.
*/
ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
/*
* Set specific keys. On Linux/ELF, the thread local storage
* is just before %gs:0. Our dynamic 8.out's reserve 8 bytes
* for the two words g and m at %gs:-8 and %gs:-4.
* Xen requires us to access those words indirect from %gs:0
* which points at itself.
*/
asm volatile (
"movl %%gs:0, %%eax\n" // MOVL 0(GS), tmp
"movl %0, -8(%%eax)\n" // MOVL g, -8(GS)
"movl %1, -4(%%eax)\n" // MOVL m, -4(GS)
:: "r"(ts.g), "r"(ts.m) : "%eax"
);
crosscall_386(ts.fn);
return nil;
}
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