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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* GC related routines
*
*/
#include <windows.h>
#include "primpl.h"
PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
#if defined(_X86_)
CONTEXT context;
context.ContextFlags = CONTEXT_INTEGER;
if (_PR_IS_NATIVE_THREAD(t)) {
context.ContextFlags |= CONTEXT_CONTROL;
if (GetThreadContext(t->md.handle, &context)) {
t->md.gcContext[0] = context.Eax;
t->md.gcContext[1] = context.Ebx;
t->md.gcContext[2] = context.Ecx;
t->md.gcContext[3] = context.Edx;
t->md.gcContext[4] = context.Esi;
t->md.gcContext[5] = context.Edi;
t->md.gcContext[6] = context.Esp;
t->md.gcContext[7] = context.Ebp;
*np = PR_NUM_GCREGS;
} else {
PR_ASSERT(0);/* XXX */
}
} else {
/* WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*
* This code is extremely machine dependant and completely
* undocumented by MS. Its only known to work experimentally.
* Ready for a walk on the wild * side?
*
* WARNING WARNING WARNING WARNING WARNING WARNING WARNING */
#if !defined WIN95 // Win95 does not have fibers
int *fiberData = t->md.fiber_id;
/* I found these offsets by disassembling SwitchToFiber().
* Are your palms sweating yet?
*/
/*
** EAX is on the stack (ESP+0)
** EDX is on the stack (ESP+4)
** ECX is on the stack (ESP+8)
*/
t->md.gcContext[0] = 0; /* context.Eax */
t->md.gcContext[1] = fiberData[0x2e]; /* context.Ebx */
t->md.gcContext[2] = 0; /* context.Ecx */
t->md.gcContext[2] = 0; /* context.Edx */
t->md.gcContext[4] = fiberData[0x2d]; /* context.Esi */
t->md.gcContext[5] = fiberData[0x2c]; /* context.Edi */
t->md.gcContext[6] = fiberData[0x36]; /* context.Esp */
t->md.gcContext[7] = fiberData[0x32]; /* context.Ebp */
*np = PR_NUM_GCREGS;
#endif
}
return (PRWord *)&t->md.gcContext;
#elif defined(_ALPHA_)
#endif /* defined(_X86_) */
}
/* This function is not used right now, but is left as a reference.
* If you ever need to get the fiberID from the currently running fiber,
* this is it.
*/
void *
GetMyFiberID()
{
#if defined(_X86_) && !defined(__MINGW32__)
void *fiberData;
/* A pointer to our tib entry is found at FS:[18]
* At offset 10h is the fiberData pointer. The context of the
* fiber is stored in there.
*/
__asm {
mov EDX, FS:[18h]
mov EAX, DWORD PTR [EDX+10h]
mov [fiberData], EAX
}
return fiberData;
#elif defined(_ALPHA_)
#endif /* defined(_X86_) */
}
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