99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* GC related routines
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*
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*/
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#include <windows.h>
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#include "primpl.h"
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PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
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{
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#if defined(_X86_)
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CONTEXT context;
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context.ContextFlags = CONTEXT_INTEGER;
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if (_PR_IS_NATIVE_THREAD(t)) {
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context.ContextFlags |= CONTEXT_CONTROL;
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if (GetThreadContext(t->md.handle, &context)) {
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t->md.gcContext[0] = context.Eax;
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t->md.gcContext[1] = context.Ebx;
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t->md.gcContext[2] = context.Ecx;
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t->md.gcContext[3] = context.Edx;
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t->md.gcContext[4] = context.Esi;
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t->md.gcContext[5] = context.Edi;
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t->md.gcContext[6] = context.Esp;
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t->md.gcContext[7] = context.Ebp;
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*np = PR_NUM_GCREGS;
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} else {
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PR_ASSERT(0);/* XXX */
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}
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} else {
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/* WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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*
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* This code is extremely machine dependant and completely
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* undocumented by MS. Its only known to work experimentally.
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* Ready for a walk on the wild * side?
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*
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* WARNING WARNING WARNING WARNING WARNING WARNING WARNING */
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#if !defined WIN95 // Win95 does not have fibers
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int *fiberData = t->md.fiber_id;
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/* I found these offsets by disassembling SwitchToFiber().
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* Are your palms sweating yet?
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*/
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/*
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** EAX is on the stack (ESP+0)
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** EDX is on the stack (ESP+4)
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** ECX is on the stack (ESP+8)
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*/
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t->md.gcContext[0] = 0; /* context.Eax */
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t->md.gcContext[1] = fiberData[0x2e]; /* context.Ebx */
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t->md.gcContext[2] = 0; /* context.Ecx */
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t->md.gcContext[3] = 0; /* context.Edx */
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t->md.gcContext[4] = fiberData[0x2d]; /* context.Esi */
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t->md.gcContext[5] = fiberData[0x2c]; /* context.Edi */
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t->md.gcContext[6] = fiberData[0x36]; /* context.Esp */
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t->md.gcContext[7] = fiberData[0x32]; /* context.Ebp */
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*np = PR_NUM_GCREGS;
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#endif
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}
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return (PRWord *)&t->md.gcContext;
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#else
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PR_NOT_REACHED("not implemented");
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return NULL;
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#endif /* defined(_X86_) */
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}
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/* This function is not used right now, but is left as a reference.
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* If you ever need to get the fiberID from the currently running fiber,
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* this is it.
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*/
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void *
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GetMyFiberID()
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{
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#if defined(_X86_) && !defined(__MINGW32__)
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void *fiberData;
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/* A pointer to our tib entry is found at FS:[18]
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* At offset 10h is the fiberData pointer. The context of the
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* fiber is stored in there.
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*/
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__asm {
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mov EDX, FS:[18h]
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mov EAX, DWORD PTR [EDX+10h]
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mov [fiberData], EAX
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}
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return fiberData;
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#else
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PR_NOT_REACHED("not implemented");
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return NULL;
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#endif /* defined(_X86_) */
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}
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