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3092
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1 /* Virtual diry bit implementation for XEmacs.
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2 Copyright (C) 2005 Marcus Crestani.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 #include <config.h>
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24 #include "lisp.h"
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25 #include "gc.h"
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26 #include "mc-alloc.h"
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27 #include "vdb.h"
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28
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29 #include "syswindows.h"
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30
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31
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32 DWORD WINAPI
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33 win32_fault_handler (LPEXCEPTION_POINTERS e)
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34 {
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35 #define GET_FAULT_ADDRESS (void *) e->ExceptionRecord->ExceptionInformation[1]
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36 if ((e->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
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37 && (e->ExceptionRecord->ExceptionInformation[0] == 1)
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38 && write_barrier_enabled
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39 && (fault_on_protected_page (GET_FAULT_ADDRESS)))
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40 {
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41 vdb_designate_modified (GET_FAULT_ADDRESS);
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42 unprotect_page_and_mark_dirty (GET_FAULT_ADDRESS);
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43 return EXCEPTION_CONTINUE_EXECUTION;
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44 }
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45 else
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46 return EXCEPTION_CONTINUE_SEARCH;
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47 }
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48
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49 typedef DWORD (WINAPI *gcPVECTORED_EXCEPTION_HANDLER) (LPEXCEPTION_POINTERS e);
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50
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51
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52 void
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53 vdb_install_signal_handler (void)
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54 {
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55 HMODULE hm;
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56 PVOID (WINAPI *aveh) (ULONG, gcPVECTORED_EXCEPTION_HANDLER);
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57
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58 /* See init_signals_very_early () in signal.c. */
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59 if (noninteractive && !initialized)
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60 {
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61 allow_incremental_gc = 0;
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62 return;
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63 }
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64
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65 hm = qxeGetModuleHandle (XETEXT ("kernel32"));
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66 if (hm)
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67 aveh = (PVOID (WINAPI *) (ULONG, gcPVECTORED_EXCEPTION_HANDLER))
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68 GetProcAddress (hm, "AddVectoredExceptionHandler");
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69 else
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70 {
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71 fprintf (stderr, "\nFAILED TO LOAD LIBRARY\n");
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72 aveh = NULL;
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73 }
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74 if (aveh)
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75 {
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76 allow_incremental_gc = 1;
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77 aveh (TRUE, win32_fault_handler);
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78 }
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79 else
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80 {
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81 fprintf (stderr, "\nFAILED TO INSTALL SIGNAL HANDLER\n");
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82 ABORT ();
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83 }
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84 }
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85
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86
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87 void
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88 vdb_protect (void *ptr, EMACS_INT len)
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89 {
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90 DWORD old;
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91 VirtualProtect (ptr, len, PAGE_READONLY, &old);
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92 }
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93
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94
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95 void
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96 vdb_unprotect (void *ptr, EMACS_INT len)
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97 {
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98 DWORD old;
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99 VirtualProtect (ptr, len, PAGE_READWRITE, &old);
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100 }
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