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os2gc.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
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00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039  * GC related routines
00040  *
00041  */
00042 #include "primpl.h"
00043 
00044 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) 
00045 {
00046     CONTEXTRECORD context;
00047     context.ContextFlags = CONTEXT_INTEGER;
00048 
00049     if (_PR_IS_NATIVE_THREAD(t)) {
00050         context.ContextFlags |= CONTEXT_CONTROL;
00051         if (QueryThreadContext(t->md.handle, CONTEXT_CONTROL, &context)) {
00052             t->md.gcContext[0] = context.ctx_RegEax;
00053             t->md.gcContext[1] = context.ctx_RegEbx;
00054             t->md.gcContext[2] = context.ctx_RegEcx;
00055             t->md.gcContext[3] = context.ctx_RegEdx;
00056             t->md.gcContext[4] = context.ctx_RegEsi;
00057             t->md.gcContext[5] = context.ctx_RegEdi;
00058             t->md.gcContext[6] = context.ctx_RegEsp;
00059             t->md.gcContext[7] = context.ctx_RegEbp;
00060             *np = PR_NUM_GCREGS;
00061         } else {
00062             PR_ASSERT(0);/* XXX */
00063         }
00064     }
00065     return (PRWord *)&t->md.gcContext;
00066 }
00067 
00068 /* This function is not used right now, but is left as a reference.
00069  * If you ever need to get the fiberID from the currently running fiber, 
00070  * this is it.
00071  */
00072 void *
00073 GetMyFiberID()
00074 {
00075     void *fiberData = 0;
00076 
00077     /* A pointer to our tib entry is found at FS:[18]
00078      * At offset 10h is the fiberData pointer.  The context of the 
00079      * fiber is stored in there.  
00080      */
00081 #ifdef HAVE_ASM
00082     __asm {
00083         mov    EDX, FS:[18h]
00084         mov    EAX, DWORD PTR [EDX+10h]
00085         mov    [fiberData], EAX
00086     }
00087 #endif
00088   
00089     return fiberData;
00090 }