1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5#define WIN64_LEAN_AND_MEAN
6#include <windows.h>
7#include <process.h>
8#include <stdlib.h>
9#include <stdio.h>
10#include "libcgo.h"
11
12static void threadentry(void*);
13
14/* 2MB is default stack size for 64-bit Windows.
15   Allocation granularity on Windows is typically 64 KB.
16   The constant is also hardcoded in cmd/ld/pe.c (keep synchronized). */
17#define STACKSIZE (2*1024*1024)
18
19void
20x_cgo_init(G *g)
21{
22	int tmp;
23	g->stacklo = (uintptr)&tmp - STACKSIZE + 8*1024;
24}
25
26
27void
28_cgo_sys_thread_start(ThreadStart *ts)
29{
30	uintptr_t thandle;
31
32	thandle = _beginthread(threadentry, 0, ts);
33	if(thandle == -1) {
34		fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
35		abort();
36	}
37}
38
39static void
40threadentry(void *v)
41{
42	ThreadStart ts;
43
44	ts = *(ThreadStart*)v;
45	free(v);
46
47	ts.g->stackhi = (uintptr)&ts;
48	ts.g->stacklo = (uintptr)&ts - STACKSIZE + 8*1024;
49
50	/*
51	 * Set specific keys in thread local storage.
52	 */
53	asm volatile (
54	  "movq %0, %%gs:0x28\n"	// MOVL tls0, 0x28(GS)
55	  "movq %%gs:0x28, %%rax\n" // MOVQ 0x28(GS), tmp
56	  "movq %1, 0(%%rax)\n" // MOVQ g, 0(GS)
57	  :: "r"(ts.tls), "r"(ts.g) : "%rax"
58	);
59
60	crosscall_amd64(ts.fn);
61}
62