blob: 00322d4b7e7b9583e7a9f7a1c81149d758698541 [file] [log] [blame]
// 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
void (*initcgo) = xinitcgo;
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);
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;
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"
return nil;