The Tor Browser: nsprpub/pr/src/md/os2/os2gc.c@4ab42b5ab56c

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7  * GC related routines

     8  *

     9  */

    10 #include "primpl.h"

    12 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)

    13 {

    14     CONTEXTRECORD context;

    15     context.ContextFlags = CONTEXT_INTEGER;

    17     if (_PR_IS_NATIVE_THREAD(t)) {

    18         context.ContextFlags |= CONTEXT_CONTROL;

    19         if (QueryThreadContext(t->md.handle, CONTEXT_CONTROL, &context)) {

    20             t->md.gcContext[0] = context.ctx_RegEax;

    21             t->md.gcContext[1] = context.ctx_RegEbx;

    22             t->md.gcContext[2] = context.ctx_RegEcx;

    23             t->md.gcContext[3] = context.ctx_RegEdx;

    24             t->md.gcContext[4] = context.ctx_RegEsi;

    25             t->md.gcContext[5] = context.ctx_RegEdi;

    26             t->md.gcContext[6] = context.ctx_RegEsp;

    27             t->md.gcContext[7] = context.ctx_RegEbp;

    28             *np = PR_NUM_GCREGS;

    29         } else {

    30             PR_ASSERT(0);/* XXX */

    31         }

    32     }

    33     return (PRWord *)&t->md.gcContext;

    34 }

    36 /* This function is not used right now, but is left as a reference.

    37  * If you ever need to get the fiberID from the currently running fiber,

    38  * this is it.

    39  */

    40 void *

    41 GetMyFiberID()

    42 {

    43     void *fiberData = 0;

    45     /* A pointer to our tib entry is found at FS:[18]

    46      * At offset 10h is the fiberData pointer.  The context of the

    47      * fiber is stored in there.

    48      */

    49 #ifdef HAVE_ASM

    50     __asm {

    51         mov    EDX, FS:[18h]

    52         mov    EAX, DWORD PTR [EDX+10h]

    53         mov    [fiberData], EAX

    54     }

    55 #endif

    57     return fiberData;

    58 }

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