michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * GC related routines
michael@0:  *
michael@0:  */
michael@0: #include "primpl.h"
michael@0: 
michael@0: PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) 
michael@0: {
michael@0:     CONTEXTRECORD context;
michael@0:     context.ContextFlags = CONTEXT_INTEGER;
michael@0: 
michael@0:     if (_PR_IS_NATIVE_THREAD(t)) {
michael@0:         context.ContextFlags |= CONTEXT_CONTROL;
michael@0:         if (QueryThreadContext(t->md.handle, CONTEXT_CONTROL, &context)) {
michael@0:             t->md.gcContext[0] = context.ctx_RegEax;
michael@0:             t->md.gcContext[1] = context.ctx_RegEbx;
michael@0:             t->md.gcContext[2] = context.ctx_RegEcx;
michael@0:             t->md.gcContext[3] = context.ctx_RegEdx;
michael@0:             t->md.gcContext[4] = context.ctx_RegEsi;
michael@0:             t->md.gcContext[5] = context.ctx_RegEdi;
michael@0:             t->md.gcContext[6] = context.ctx_RegEsp;
michael@0:             t->md.gcContext[7] = context.ctx_RegEbp;
michael@0:             *np = PR_NUM_GCREGS;
michael@0:         } else {
michael@0:             PR_ASSERT(0);/* XXX */
michael@0:         }
michael@0:     }
michael@0:     return (PRWord *)&t->md.gcContext;
michael@0: }
michael@0: 
michael@0: /* This function is not used right now, but is left as a reference.
michael@0:  * If you ever need to get the fiberID from the currently running fiber, 
michael@0:  * this is it.
michael@0:  */
michael@0: void *
michael@0: GetMyFiberID()
michael@0: {
michael@0:     void *fiberData = 0;
michael@0: 
michael@0:     /* A pointer to our tib entry is found at FS:[18]
michael@0:      * At offset 10h is the fiberData pointer.  The context of the 
michael@0:      * fiber is stored in there.  
michael@0:      */
michael@0: #ifdef HAVE_ASM
michael@0:     __asm {
michael@0:         mov    EDX, FS:[18h]
michael@0:         mov    EAX, DWORD PTR [EDX+10h]
michael@0:         mov    [fiberData], EAX
michael@0:     }
michael@0: #endif
michael@0:   
michael@0:     return fiberData;
michael@0: }