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428
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1 /* unexec for GNU Emacs on Windows NT.
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2 Copyright (C) 1994 Free Software Foundation, Inc.
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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 the Free
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18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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19 02111-1307, USA.
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20
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21 Geoff Voelker (voelker@cs.washington.edu) 8-12-94 */
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22
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23 /* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */
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24
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25 /* The linkers that come with MSVC >= 4.0 merge .bss into .data and reorder
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26 * uninitialised data so that the .data section looks like:
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27 *
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28 * crt0 initialised data
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29 * emacs initialised data
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30 * <my_edata>
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31 * library initialised data
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32 * <start of bss part of .data>
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33 * emacs static uninitialised data
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34 * library static uninitialised data
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35 * emacs global uninitialised data
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36 * <my_ebss>
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37 * library global uninitialised data
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38 *
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39 * This means that we can't use the normal my_ebss in lastfile.c trick to
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40 * differentiate between unitialised data that belongs to emacs and
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41 * uninitialised data that belongs to system libraries. This is bad because
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42 * we do want to initialise the emacs data, but we don't want to initialise
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43 * the system library data.
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44 *
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45 * To solve this problem using MSVC >= 5.0 we use a pragma directive to tell
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46 * the compiler to put emacs's data (both initialised and uninitialised) in
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47 * a separate section in the executable, and we only dump that section. This
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48 * means that all files that define initialized data must include config.h
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49 * to pick up the pragma. We don't try to make any part of that section
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50 * read-only.
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51 *
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52 * This pragma directive isn't supported by the MSVC 4.x compiler. Instead,
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53 * we dump crt0 initialised data and library static uninitialised data in
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54 * addition to the emacs data. This is wrong, but we appear to be able to
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55 * get away with it. A proper fix might involve the introduction of a static
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56 * version of my_ebss in lastfile.c and a new firstfile.c file. jhar */
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57
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58 #include <config.h>
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442
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59 #include "lisp.h"
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60
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61 #include "syswindows.h"
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62
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63 #include "nt.h"
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64 #include "ntheap.h"
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428
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65
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66 /* From IMAGEHLP.H which is not installed by default by MSVC < 5 */
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67 /* The IMAGEHLP.DLL library is not distributed by default with Windows95 */
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442
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68 typedef PIMAGE_NT_HEADERS
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69 (__stdcall * pfnCheckSumMappedFile_t) (LPVOID BaseAddress, DWORD FileLength,
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70 LPDWORD HeaderSum, LPDWORD CheckSum);
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71
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428
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72
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73 #if 0
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74 extern BOOL ctrl_c_handler (unsigned long type);
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75 #endif
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76
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442
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77 /* Sync with FSF Emacs 19.34.6
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78 note: struct file_data is now defined in nt.h */
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428
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79
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80 enum {
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81 HEAP_UNINITIALIZED = 1,
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82 HEAP_UNLOADED,
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83 HEAP_LOADED
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84 };
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85
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86 /* Basically, our "initialized" flag. */
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87 int heap_state = HEAP_UNINITIALIZED;
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88
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89 /* So we can find our heap in the file to recreate it. */
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90 unsigned long heap_index_in_executable = UNINIT_LONG;
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91
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92 void get_section_info (file_data *p_file);
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93 void copy_executable_and_dump_data_section (file_data *, file_data *);
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94 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
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95
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96 /* Cached info about the .data section in the executable. */
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97 PUCHAR data_start_va = UNINIT_PTR;
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98 DWORD data_start_file = UNINIT_LONG;
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99 DWORD data_size = UNINIT_LONG;
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100
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101 /* Cached info about the .bss section in the executable. */
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102 PUCHAR bss_start = UNINIT_PTR;
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103 DWORD bss_size = UNINIT_LONG;
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104
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105 /* Startup code for running on NT. When we are running as the dumped
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106 version, we need to bootstrap our heap and .bss section into our
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107 address space before we can actually hand off control to the startup
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108 code supplied by NT (primarily because that code relies upon malloc ()). */
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440
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109
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110 /* **********************
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111 Hackers please remember, this _start() thingy is *not* called neither
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112 when dumping portably, nor when running from temacs! Do not put
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113 significant XEmacs initialization here!
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114 ********************** */
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115
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428
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116 void
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117 _start (void)
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118 {
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119 extern void mainCRTStartup (void);
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120
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121 /* Cache system info, e.g., the NT page size. */
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122 cache_system_info ();
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123
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124 /* If we're a dumped version of emacs then we need to recreate
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125 our heap and play tricks with our .bss section. Do this before
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126 start up. (WARNING: Do not put any code before this section
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127 that relies upon malloc () and runs in the dumped version. It
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128 won't work.) */
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129 if (heap_state == HEAP_UNLOADED)
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130 {
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131 char executable_path[MAX_PATH];
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132
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133 if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0)
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134 {
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135 exit (1);
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136 }
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137
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440
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138 /* #### This is super-bogus. When I rename xemacs.exe,
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139 the renamed file still loads its heap from xemacs.exe --kkm */
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140 #if 0
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141 {
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142 /* To allow profiling, make sure executable_path names the .exe
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143 file, not the file created by the profiler */
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144 char *p = strrchr (executable_path, '\\');
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145 strcpy (p+1, PATH_PROGNAME ".exe");
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146 }
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147 #endif
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428
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148
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149 recreate_heap (executable_path);
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150 heap_state = HEAP_LOADED;
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151 }
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152
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440
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153 /* #### This is bogus, too. _fmode is set to different values
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154 when we run `xemacs' and `temacs run-emacs'. The sooner we
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155 hit and fix all the weirdities this causes us, the better --kkm */
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156 #if 0
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428
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157 /* The default behavior is to treat files as binary and patch up
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442
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158 text files appropriately. */
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428
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159 _fmode = O_BINARY;
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440
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160 #endif
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428
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161
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162 #if 0
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163 /* This prevents ctrl-c's in shells running while we're suspended from
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164 having us exit. */
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165 SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
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166 #endif
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167
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168 mainCRTStartup ();
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169 }
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170
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171 /* Dump out .data and .bss sections into a new executable. */
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442
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172 int
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173 unexec (char *new_name, char *old_name, unsigned int start_data,
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174 unsigned int start_bss, unsigned int entry_address)
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428
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175 {
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176 file_data in_file, out_file;
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177 char out_filename[MAX_PATH], in_filename[MAX_PATH];
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178 unsigned long size;
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179 char *ptr;
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442
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180 HINSTANCE hImagehelp;
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428
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181
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182 /* Make sure that the input and output filenames have the
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183 ".exe" extension...patch them up if they don't. */
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184 strcpy (in_filename, old_name);
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185 ptr = in_filename + strlen (in_filename) - 4;
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186 if (strcmp (ptr, ".exe"))
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187 strcat (in_filename, ".exe");
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188
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189 strcpy (out_filename, new_name);
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190 ptr = out_filename + strlen (out_filename) - 4;
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191 if (strcmp (ptr, ".exe"))
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192 strcat (out_filename, ".exe");
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193
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194 printf ("Dumping from %s\n", in_filename);
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195 printf (" to %s\n", out_filename);
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196
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197 /* We need to round off our heap to NT's allocation unit (64KB). */
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198 round_heap (get_allocation_unit ());
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199
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200 /* Open the undumped executable file. */
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201 if (!open_input_file (&in_file, in_filename))
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202 {
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203 printf ("Failed to open %s (%d)...bailing.\n",
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204 in_filename, GetLastError ());
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205 exit (1);
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206 }
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207
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208 /* Get the interesting section info, like start and size of .bss... */
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209 get_section_info (&in_file);
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210
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211 /* The size of the dumped executable is the size of the original
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212 executable plus the size of the heap and the size of the .bss section. */
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213 heap_index_in_executable = (unsigned long)
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214 round_to_next ((unsigned char *) in_file.size, get_allocation_unit ());
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215 size = heap_index_in_executable + get_committed_heap_size () + bss_size;
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216 if (!open_output_file (&out_file, out_filename, size))
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217 {
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218 printf ("Failed to open %s (%d)...bailing.\n",
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219 out_filename, GetLastError ());
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220 exit (1);
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221 }
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222
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223 /* Set the flag (before dumping). */
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224 heap_state = HEAP_UNLOADED;
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225
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226 copy_executable_and_dump_data_section (&in_file, &out_file);
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227 dump_bss_and_heap (&in_file, &out_file);
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228
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229 /* Patch up header fields; profiler is picky about this. */
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230 hImagehelp = LoadLibrary ("imagehlp.dll");
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231 if (hImagehelp)
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232 {
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233 PIMAGE_DOS_HEADER dos_header;
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234 PIMAGE_NT_HEADERS nt_header;
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442
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235
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428
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236 DWORD headersum;
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237 DWORD checksum;
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442
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238 pfnCheckSumMappedFile_t pfnCheckSumMappedFile;
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428
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239
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240 dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
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241 nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
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242
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243 nt_header->OptionalHeader.CheckSum = 0;
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442
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244 #if 0
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245 nt_header->FileHeader.TimeDateStamp = time (NULL);
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246 dos_header->e_cp = size / 512;
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247 nt_header->OptionalHeader.SizeOfImage = size;
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248 #endif
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428
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249
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442
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250 pfnCheckSumMappedFile =
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251 (pfnCheckSumMappedFile_t) GetProcAddress (hImagehelp,
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252 "CheckSumMappedFile");
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428
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253 if (pfnCheckSumMappedFile)
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254 {
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442
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255 #if 0
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256 nt_header->FileHeader.TimeDateStamp = time (NULL);
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257 #endif
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428
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258 pfnCheckSumMappedFile (out_file.file_base,
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259 out_file.size,
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260 &headersum,
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261 &checksum);
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262 nt_header->OptionalHeader.CheckSum = checksum;
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263 }
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264 FreeLibrary (hImagehelp);
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265 }
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266
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267 close_file_data (&in_file);
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268 close_file_data (&out_file);
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269
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442
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270 return 0;
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428
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271 }
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272
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273 /* Routines to manipulate NT executable file sections. */
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274
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275 #ifndef DUMP_SEPARATE_SECTION
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276 static void
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277 get_bss_info_from_map_file (file_data *p_infile, PUCHAR *p_bss_start,
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278 DWORD *p_bss_size)
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279 {
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280 int n, start, len;
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281 char map_filename[MAX_PATH];
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282 char buffer[256];
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283 FILE *map;
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284
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285 /* Overwrite the .exe extension on the executable file name with
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286 the .map extension. */
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287 strcpy (map_filename, p_infile->name);
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288 n = strlen (map_filename) - 3;
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289 strcpy (&map_filename[n], "map");
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290
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291 map = fopen (map_filename, "r");
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292 if (!map)
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293 {
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294 printf ("Failed to open map file %s, error %d...bailing out.\n",
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295 map_filename, GetLastError ());
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296 exit (-1);
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297 }
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298
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299 while (fgets (buffer, sizeof (buffer), map))
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300 {
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301 if (!(strstr (buffer, ".bss") && strstr (buffer, "DATA")))
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302 continue;
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303 n = sscanf (buffer, " %*d:%x %x", &start, &len);
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304 if (n != 2)
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305 {
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306 printf ("Failed to scan the .bss section line:\n%s", buffer);
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307 exit (-1);
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308 }
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309 break;
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310 }
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311 *p_bss_start = (PUCHAR) start;
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312 *p_bss_size = (DWORD) len;
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313 }
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314 #endif
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315
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316 /* Flip through the executable and cache the info necessary for dumping. */
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317 static void
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318 get_section_info (file_data *p_infile)
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319 {
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320 PIMAGE_DOS_HEADER dos_header;
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321 PIMAGE_NT_HEADERS nt_header;
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322 PIMAGE_SECTION_HEADER section, data_section;
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323 unsigned char *ptr;
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324 int i;
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325
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326 dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
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327 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
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328 {
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329 printf ("Unknown EXE header in %s...bailing.\n", p_infile->name);
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330 exit (1);
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331 }
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332 nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
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333 dos_header->e_lfanew);
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334 if (nt_header == NULL)
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335 {
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336 printf ("Failed to find IMAGE_NT_HEADER in %s...bailing.\n",
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337 p_infile->name);
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338 exit (1);
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339 }
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340
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341 /* Check the NT header signature ... */
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342 if (nt_header->Signature != IMAGE_NT_SIGNATURE)
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343 {
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344 printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
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345 nt_header->Signature, p_infile->name);
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346 }
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347
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348 /* Flip through the sections for .data and .bss ... */
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349 section = (PIMAGE_SECTION_HEADER) IMAGE_FIRST_SECTION (nt_header);
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350 for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
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351 {
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352 #ifndef DUMP_SEPARATE_SECTION
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353 if (!strcmp (section->Name, ".bss"))
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354 {
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355 extern int my_ebss; /* From lastfile.c */
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356
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357 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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358 section->VirtualAddress;
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359 bss_start = ptr;
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360 bss_size = (char*)&my_ebss - (char*)bss_start;
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361 }
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362
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363 if (!strcmp (section->Name, ".data"))
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364 #else
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365 if (!strcmp (section->Name, "xdata"))
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366 #endif
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367 {
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368 extern char my_edata[]; /* From lastfile.c */
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369
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370 /* The .data section. */
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371 data_section = section;
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372 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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373 section->VirtualAddress;
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374 data_start_va = ptr;
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375 data_start_file = section->PointerToRawData;
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376
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377 #ifndef DUMP_SEPARATE_SECTION
|
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378 /* Write only the part of the section that contains emacs data. */
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379 data_size = my_edata - data_start_va;
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380 #else
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381 /* Write back the full section. */
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382 data_size = section->SizeOfRawData;
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383
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|
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384 /* This code doesn't know how to grow the raw size of a section. */
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|
385 if (section->SizeOfRawData < section->Misc.VirtualSize)
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|
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386 {
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|
387 printf ("The emacs data section is smaller than expected"
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|
388 "...bailing.\n");
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389 exit (1);
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390 }
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391 #endif
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|
|
392 }
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393 section++;
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394 }
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395
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396 #ifndef DUMP_SEPARATE_SECTION
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397 if (bss_start == UNINIT_PTR)
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398 {
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399 /* Starting with MSVC 4.0, the .bss section has been eliminated
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400 and appended virtually to the end of the .data section. Our
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401 only hint about where the .bss section starts in the address
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402 comes from the SizeOfRawData field in the .data section
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403 header. Unfortunately, this field is only approximate, as it
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404 is a rounded number and is typically rounded just beyond the
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405 start of the .bss section. To find the start and size of the
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406 .bss section exactly, we have to peek into the map file. */
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407 extern int my_ebss;
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408
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409 get_bss_info_from_map_file (p_infile, &ptr, &bss_size);
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410 bss_start = ptr + nt_header->OptionalHeader.ImageBase
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411 + data_section->VirtualAddress;
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412 bss_size = (char*)&my_ebss - (char*)bss_start;
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413 }
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414 #else
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415 bss_size = 0;
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416 #endif
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417 }
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418
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419
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420 /* The dump routines. */
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421
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422 #ifdef DEBUG_XEMACS
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423 #define DUMP_MSG(x) printf x
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424 #else
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425 #define DUMP_MSG(x)
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426 #endif
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427
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428 static void
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429 copy_executable_and_dump_data_section (file_data *p_infile,
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430 file_data *p_outfile)
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431 {
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432 unsigned char *data_file, *data_va;
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433 unsigned long size, index;
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434
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435 /* Get a pointer to where the raw data should go in the executable file. */
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436 data_file = (char *) p_outfile->file_base + data_start_file;
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437
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438 /* Get a pointer to the raw data in our address space. */
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439 data_va = data_start_va;
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440
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441 size = (DWORD) data_file - (DWORD) p_outfile->file_base;
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442 DUMP_MSG (("Copying executable up to data section...\n"));
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443 DUMP_MSG (("\t0x%08x Offset in input file.\n", 0));
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444 DUMP_MSG (("\t0x%08x Offset in output file.\n", 0));
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445 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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446 memcpy (p_outfile->file_base, p_infile->file_base, size);
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447
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448 size = data_size;
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449 DUMP_MSG (("Dumping data section...\n"));
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450 DUMP_MSG (("\t0x%08x Address in process.\n", data_va));
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451 DUMP_MSG (("\t0x%08x Offset in output file.\n",
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442
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452 (char*)data_file - p_outfile->file_base));
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428
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453 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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454 memcpy (data_file, data_va, size);
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455
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456 index = (DWORD) data_file + size - (DWORD) p_outfile->file_base;
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457 size = p_infile->size - index;
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458 DUMP_MSG (("Copying rest of executable...\n"));
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459 DUMP_MSG (("\t0x%08x Offset in input file.\n", index));
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460 DUMP_MSG (("\t0x%08x Offset in output file.\n", index));
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461 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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462 memcpy ((char *) p_outfile->file_base + index,
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463 (char *) p_infile->file_base + index, size);
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464 }
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465
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|
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466 static void
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|
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467 dump_bss_and_heap (file_data *p_infile, file_data *p_outfile)
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468 {
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469 unsigned char *heap_data;
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470 unsigned long size, index;
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471
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472 DUMP_MSG (("Dumping heap onto end of executable...\n"));
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473
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|
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474 index = heap_index_in_executable;
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|
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475 size = get_committed_heap_size ();
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|
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476 heap_data = get_heap_start ();
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|
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477
|
|
|
478 DUMP_MSG (("\t0x%08x Heap start in process.\n", heap_data));
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|
|
479 DUMP_MSG (("\t0x%08x Heap offset in executable.\n", index));
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|
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480 DUMP_MSG (("\t0x%08x Heap size in bytes.\n", size));
|
|
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481
|
|
|
482 memcpy ((PUCHAR) p_outfile->file_base + index, heap_data, size);
|
|
|
483
|
|
|
484 #ifndef DUMP_SEPARATE_SECTION
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|
|
485 DUMP_MSG (("Dumping bss onto end of executable...\n"));
|
|
|
486
|
|
|
487 index += size;
|
|
|
488 size = bss_size;
|
|
|
489
|
|
|
490 DUMP_MSG (("\t0x%08x BSS start in process.\n", bss_start));
|
|
|
491 DUMP_MSG (("\t0x%08x BSS offset in executable.\n", index));
|
|
|
492 DUMP_MSG (("\t0x%08x BSS size in bytes.\n", size));
|
|
|
493 memcpy ((char *) p_outfile->file_base + index, bss_start, size);
|
|
|
494 #endif
|
|
|
495 }
|
|
|
496
|
|
|
497 #undef DUMP_MSG
|
|
|
498
|
|
|
499 /* Reload and remap routines. */
|
|
|
500
|
|
|
501
|
|
|
502 /* Load the dumped .bss section into the .bss area of our address space. */
|
|
|
503 /* Already done if the .bss was part of a separate emacs data section */
|
|
|
504 void
|
|
|
505 read_in_bss (char *filename)
|
|
|
506 {
|
|
|
507 #ifndef DUMP_SEPARATE_SECTION
|
|
|
508 HANDLE file;
|
|
|
509 unsigned long index, n_read;
|
|
|
510
|
|
|
511 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
|
|
|
512 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
|
|
|
513 if (file == INVALID_HANDLE_VALUE)
|
|
|
514 abort ();
|
|
|
515
|
|
|
516 /* Seek to where the .bss section is tucked away after the heap... */
|
|
|
517 index = heap_index_in_executable + get_committed_heap_size ();
|
|
|
518 if (SetFilePointer (file, index, NULL, FILE_BEGIN) == 0xFFFFFFFF)
|
|
|
519 abort ();
|
|
|
520
|
|
|
521 /* Ok, read in the saved .bss section and initialize all
|
|
|
522 uninitialized variables. */
|
|
|
523 if (!ReadFile (file, bss_start, bss_size, &n_read, NULL))
|
|
|
524 abort ();
|
|
|
525
|
|
|
526 CloseHandle (file);
|
|
|
527 #endif
|
|
|
528 }
|
|
|
529
|
|
|
530 /* Map the heap dumped into the executable file into our address space. */
|
|
|
531 void
|
|
|
532 map_in_heap (char *filename)
|
|
|
533 {
|
|
|
534 HANDLE file;
|
|
|
535 HANDLE file_mapping;
|
|
|
536 void *file_base;
|
|
|
537 unsigned long size, upper_size, n_read;
|
|
|
538
|
|
|
539 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
|
|
|
540 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
|
|
|
541 if (file == INVALID_HANDLE_VALUE)
|
|
|
542 abort ();
|
|
|
543
|
|
|
544 size = GetFileSize (file, &upper_size);
|
|
|
545 file_mapping = CreateFileMapping (file, NULL, PAGE_WRITECOPY,
|
|
|
546 0, size, NULL);
|
|
|
547 if (!file_mapping)
|
|
|
548 abort ();
|
|
|
549
|
|
|
550 size = get_committed_heap_size ();
|
|
|
551 file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0,
|
|
|
552 heap_index_in_executable, size,
|
|
|
553 get_heap_start ());
|
|
|
554 if (file_base != 0)
|
|
|
555 {
|
|
|
556 return;
|
|
|
557 }
|
|
|
558
|
|
|
559 /* If we don't succeed with the mapping, then copy from the
|
|
|
560 data into the heap. */
|
|
|
561
|
|
|
562 CloseHandle (file_mapping);
|
|
|
563
|
|
|
564 if (VirtualAlloc (get_heap_start (), get_committed_heap_size (),
|
|
|
565 MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL)
|
|
|
566 abort ();
|
|
|
567
|
|
|
568 /* Seek to the location of the heap data in the executable. */
|
|
|
569 if (SetFilePointer (file, heap_index_in_executable,
|
|
|
570 NULL, FILE_BEGIN) == 0xFFFFFFFF)
|
|
|
571 abort ();
|
|
|
572
|
|
|
573 /* Read in the data. */
|
|
|
574 if (!ReadFile (file, get_heap_start (),
|
|
|
575 get_committed_heap_size (), &n_read, NULL))
|
|
|
576 abort ();
|
|
|
577
|
|
|
578 CloseHandle (file);
|
|
|
579 }
|
