Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/md/windows/ntgc.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 * GC related routines
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8 *
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9 */
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10 #include <windows.h>
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11 #include "primpl.h"
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12
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13 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
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14 {
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15 #if defined(_X86_)
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16 CONTEXT context;
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17 context.ContextFlags = CONTEXT_INTEGER;
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18
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19 if (_PR_IS_NATIVE_THREAD(t)) {
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20 context.ContextFlags |= CONTEXT_CONTROL;
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21 if (GetThreadContext(t->md.handle, &context)) {
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22 t->md.gcContext[0] = context.Eax;
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23 t->md.gcContext[1] = context.Ebx;
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24 t->md.gcContext[2] = context.Ecx;
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25 t->md.gcContext[3] = context.Edx;
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26 t->md.gcContext[4] = context.Esi;
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27 t->md.gcContext[5] = context.Edi;
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28 t->md.gcContext[6] = context.Esp;
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29 t->md.gcContext[7] = context.Ebp;
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30 *np = PR_NUM_GCREGS;
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31 } else {
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32 PR_ASSERT(0);/* XXX */
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33 }
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34 } else {
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35 /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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36 *
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37 * This code is extremely machine dependant and completely
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38 * undocumented by MS. Its only known to work experimentally.
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39 * Ready for a walk on the wild * side?
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40 *
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41 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING */
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42
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43 #if !defined WIN95 // Win95 does not have fibers
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44 int *fiberData = t->md.fiber_id;
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45
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46 /* I found these offsets by disassembling SwitchToFiber().
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47 * Are your palms sweating yet?
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48 */
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49
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50 /*
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51 ** EAX is on the stack (ESP+0)
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52 ** EDX is on the stack (ESP+4)
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53 ** ECX is on the stack (ESP+8)
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54 */
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55 t->md.gcContext[0] = 0; /* context.Eax */
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56 t->md.gcContext[1] = fiberData[0x2e]; /* context.Ebx */
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57 t->md.gcContext[2] = 0; /* context.Ecx */
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58 t->md.gcContext[3] = 0; /* context.Edx */
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59 t->md.gcContext[4] = fiberData[0x2d]; /* context.Esi */
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60 t->md.gcContext[5] = fiberData[0x2c]; /* context.Edi */
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61 t->md.gcContext[6] = fiberData[0x36]; /* context.Esp */
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62 t->md.gcContext[7] = fiberData[0x32]; /* context.Ebp */
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63 *np = PR_NUM_GCREGS;
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64 #endif
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65 }
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66 return (PRWord *)&t->md.gcContext;
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67 #else
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68 PR_NOT_REACHED("not implemented");
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69 return NULL;
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70 #endif /* defined(_X86_) */
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71 }
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72
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73 /* This function is not used right now, but is left as a reference.
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74 * If you ever need to get the fiberID from the currently running fiber,
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75 * this is it.
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76 */
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77 void *
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78 GetMyFiberID()
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79 {
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80 #if defined(_X86_) && !defined(__MINGW32__)
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81 void *fiberData;
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82
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83 /* A pointer to our tib entry is found at FS:[18]
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84 * At offset 10h is the fiberData pointer. The context of the
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85 * fiber is stored in there.
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86 */
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87 __asm {
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88 mov EDX, FS:[18h]
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89 mov EAX, DWORD PTR [EDX+10h]
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90 mov [fiberData], EAX
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91 }
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92
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93 return fiberData;
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94 #else
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95 PR_NOT_REACHED("not implemented");
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96 return NULL;
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97 #endif /* defined(_X86_) */
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98 }
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