gcc_windows_386.c

     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 WIN32_LEAN_AND_MEAN
     6  #include <windows.h>
     7  #include <process.h>
     8  #include <stdlib.h>
     9  #include <stdio.h>
    10  #include <errno.h>
    11  #include "libcgo.h"
    12  #include "libcgo_windows.h"
    13  
    14  static void threadentry(void*);
    15  static void (*setg_gcc)(void*);
    16  static DWORD *tls_g;
    17  
    18  void
    19  x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    20  {
    21  	setg_gcc = setg;
    22  	tls_g = (DWORD *)tlsg;
    23  }
    24  
    25  void
    26  _cgo_sys_thread_start(ThreadStart *ts)
    27  {
    28  	_cgo_beginthread(threadentry, ts);
    29  }
    30  
    31  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    32  static void
    33  threadentry(void *v)
    34  {
    35  	ThreadStart ts;
    36  
    37  	ts = *(ThreadStart*)v;
    38  	free(v);
    39  
    40  	// minit queries stack bounds from the OS.
    41  
    42  	/*
    43  	 * Set specific keys in thread local storage.
    44  	 */
    45  	asm volatile (
    46  		"movl %0, %%fs:0(%1)\n"	// MOVL tls0, 0(tls_g)(FS)
    47  		"movl %%fs:0(%1), %%eax\n"	// MOVL 0(tls_g)(FS), tmp
    48  		"movl %2, 0(%%eax)\n"	// MOVL g, 0(AX)
    49  		:: "r"(ts.tls), "r"(*tls_g), "r"(ts.g) : "%eax"
    50  	);
    51  
    52  	crosscall1(ts.fn, setg_gcc, ts.g);
    53  }
    54
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