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Text file src/runtime/cgo/gcc_windows_amd64.c

Documentation: runtime/cgo

     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	
    12	static 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	
    19	void
    20	x_cgo_init(G *g)
    21	{
    22		int tmp;
    23		g->stacklo = (uintptr)&tmp - STACKSIZE + 8*1024;
    24	}
    25	
    26	
    27	void
    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	
    39	static void
    40	threadentry(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	}

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