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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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59 #include <stdlib.h> /* _fmode */
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60 #include <stdio.h>
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61 #include <fcntl.h>
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62 #include <windows.h>
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63
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64 /* From IMAGEHLP.H which is not installed by default by MSVC < 5 */
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65 /* The IMAGEHLP.DLL library is not distributed by default with Windows95 */
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66 PIMAGE_NT_HEADERS
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67 (__stdcall * pfnCheckSumMappedFile) (LPVOID BaseAddress, DWORD FileLength,
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68 LPDWORD HeaderSum, LPDWORD CheckSum);
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69
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70 #if 0
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71 extern BOOL ctrl_c_handler (unsigned long type);
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72 #endif
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73
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74 #include "ntheap.h"
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75
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76 /* Sync with FSF Emacs 19.34.6 note: struct file_data is now defined in ntheap.h */
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77
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78 enum {
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79 HEAP_UNINITIALIZED = 1,
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80 HEAP_UNLOADED,
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81 HEAP_LOADED
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82 };
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83
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84 /* Basically, our "initialized" flag. */
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85 int heap_state = HEAP_UNINITIALIZED;
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86
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87 /* So we can find our heap in the file to recreate it. */
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88 unsigned long heap_index_in_executable = UNINIT_LONG;
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89
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90 void get_section_info (file_data *p_file);
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91 void copy_executable_and_dump_data_section (file_data *, file_data *);
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92 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
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93
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94 /* Cached info about the .data section in the executable. */
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95 PUCHAR data_start_va = UNINIT_PTR;
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96 DWORD data_start_file = UNINIT_LONG;
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97 DWORD data_size = UNINIT_LONG;
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98
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99 /* Cached info about the .bss section in the executable. */
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100 PUCHAR bss_start = UNINIT_PTR;
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101 DWORD bss_size = UNINIT_LONG;
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102
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103 #ifdef HAVE_NTGUI
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104 HINSTANCE hinst = NULL;
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105 HINSTANCE hprevinst = NULL;
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106 LPSTR lpCmdLine = "";
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107 int nCmdShow = 0;
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108 #endif /* HAVE_NTGUI */
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109
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110 /* Startup code for running on NT. When we are running as the dumped
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111 version, we need to bootstrap our heap and .bss section into our
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112 address space before we can actually hand off control to the startup
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113 code supplied by NT (primarily because that code relies upon malloc ()). */
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114 void
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115 _start (void)
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116 {
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117 char * p;
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118 extern void mainCRTStartup (void);
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119
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120 /* Cache system info, e.g., the NT page size. */
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121 cache_system_info ();
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122
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123 /* If we're a dumped version of emacs then we need to recreate
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124 our heap and play tricks with our .bss section. Do this before
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125 start up. (WARNING: Do not put any code before this section
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126 that relies upon malloc () and runs in the dumped version. It
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127 won't work.) */
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128 if (heap_state == HEAP_UNLOADED)
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129 {
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130 char executable_path[MAX_PATH];
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131
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132 if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0)
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133 {
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134 exit (1);
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135 }
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136
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137 /* To allow profiling, make sure executable_path names the .exe
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138 file, not the file created by the profiler */
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139 p = strrchr (executable_path, '\\');
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140 strcpy (p+1, PATH_PROGNAME ".exe");
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141
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142 recreate_heap (executable_path);
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143 heap_state = HEAP_LOADED;
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144 }
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145
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146 /* The default behavior is to treat files as binary and patch up
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147 text files appropriately, in accordance with the MSDOS code. */
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148 _fmode = O_BINARY;
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149
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150 #if 0
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151 /* This prevents ctrl-c's in shells running while we're suspended from
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152 having us exit. */
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153 SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
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154 #endif
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155
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156 /* Invoke the NT CRT startup routine now that our housecleaning
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157 is finished. */
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158 #ifdef HAVE_NTGUI
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159 /* determine WinMain args like crt0.c does */
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160 hinst = GetModuleHandle(NULL);
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161 lpCmdLine = GetCommandLine();
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162 nCmdShow = SW_SHOWDEFAULT;
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163 #endif
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164 mainCRTStartup ();
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165 }
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166
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167 /* Dump out .data and .bss sections into a new executable. */
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168 void
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169 unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
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170 void *entry_address)
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171 {
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172 file_data in_file, out_file;
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173 char out_filename[MAX_PATH], in_filename[MAX_PATH];
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174 unsigned long size;
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175 char *ptr;
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176 HANDLE hImagehelp;
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177
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178 /* Make sure that the input and output filenames have the
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179 ".exe" extension...patch them up if they don't. */
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180 strcpy (in_filename, old_name);
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181 ptr = in_filename + strlen (in_filename) - 4;
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182 if (strcmp (ptr, ".exe"))
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183 strcat (in_filename, ".exe");
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184
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185 strcpy (out_filename, new_name);
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186 ptr = out_filename + strlen (out_filename) - 4;
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187 if (strcmp (ptr, ".exe"))
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188 strcat (out_filename, ".exe");
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189
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190 printf ("Dumping from %s\n", in_filename);
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191 printf (" to %s\n", out_filename);
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192
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193 /* We need to round off our heap to NT's allocation unit (64KB). */
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194 round_heap (get_allocation_unit ());
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195
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196 /* Open the undumped executable file. */
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197 if (!open_input_file (&in_file, in_filename))
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198 {
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199 printf ("Failed to open %s (%d)...bailing.\n",
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200 in_filename, GetLastError ());
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201 exit (1);
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202 }
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203
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204 /* Get the interesting section info, like start and size of .bss... */
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205 get_section_info (&in_file);
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206
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207 /* The size of the dumped executable is the size of the original
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208 executable plus the size of the heap and the size of the .bss section. */
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209 heap_index_in_executable = (unsigned long)
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210 round_to_next ((unsigned char *) in_file.size, get_allocation_unit ());
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211 size = heap_index_in_executable + get_committed_heap_size () + bss_size;
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212 if (!open_output_file (&out_file, out_filename, size))
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213 {
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214 printf ("Failed to open %s (%d)...bailing.\n",
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215 out_filename, GetLastError ());
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216 exit (1);
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217 }
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218
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219 /* Set the flag (before dumping). */
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220 heap_state = HEAP_UNLOADED;
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221
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222 copy_executable_and_dump_data_section (&in_file, &out_file);
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223 dump_bss_and_heap (&in_file, &out_file);
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224
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225 /* Patch up header fields; profiler is picky about this. */
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226 hImagehelp = LoadLibrary ("imagehlp.dll");
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227 if (hImagehelp)
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228 {
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229 PIMAGE_DOS_HEADER dos_header;
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230 PIMAGE_NT_HEADERS nt_header;
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231 DWORD headersum;
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232 DWORD checksum;
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233
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234 dos_header = (PIMAGE_DOS_HEADER) out_file.file_base;
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235 nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew);
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236
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237 nt_header->OptionalHeader.CheckSum = 0;
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238 // nt_header->FileHeader.TimeDateStamp = time (NULL);
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239 // dos_header->e_cp = size / 512;
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240 // nt_header->OptionalHeader.SizeOfImage = size;
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241
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242 pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile");
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243 if (pfnCheckSumMappedFile)
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244 {
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245 // nt_header->FileHeader.TimeDateStamp = time (NULL);
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246 pfnCheckSumMappedFile (out_file.file_base,
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247 out_file.size,
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248 &headersum,
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249 &checksum);
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250 nt_header->OptionalHeader.CheckSum = checksum;
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251 }
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252 FreeLibrary (hImagehelp);
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253 }
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254
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255 close_file_data (&in_file);
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256 close_file_data (&out_file);
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257 }
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258
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259
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260 /* File handling. */
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261
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262
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263 int
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264 open_output_file (file_data *p_file, CONST char *filename, unsigned long size)
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265 {
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266 HANDLE file;
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267 HANDLE file_mapping;
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268 void *file_base;
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269
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270 file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
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271 CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
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272 if (file == INVALID_HANDLE_VALUE)
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273 return FALSE;
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274
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275 file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
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276 0, size, NULL);
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277 if (!file_mapping)
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278 return FALSE;
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279
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280 file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
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281 if (file_base == 0)
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282 return FALSE;
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283
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284 p_file->name = filename;
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285 p_file->size = size;
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286 p_file->file = file;
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287 p_file->file_mapping = file_mapping;
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288 p_file->file_base = file_base;
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289
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290 return TRUE;
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291 }
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292
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293 /* Routines to manipulate NT executable file sections. */
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294
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295 #ifndef DUMP_SEPARATE_SECTION
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296 static void
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297 get_bss_info_from_map_file (file_data *p_infile, PUCHAR *p_bss_start,
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298 DWORD *p_bss_size)
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299 {
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300 int n, start, len;
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301 char map_filename[MAX_PATH];
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302 char buffer[256];
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303 FILE *map;
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304
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305 /* Overwrite the .exe extension on the executable file name with
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306 the .map extension. */
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307 strcpy (map_filename, p_infile->name);
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308 n = strlen (map_filename) - 3;
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309 strcpy (&map_filename[n], "map");
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310
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311 map = fopen (map_filename, "r");
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312 if (!map)
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313 {
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314 printf ("Failed to open map file %s, error %d...bailing out.\n",
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315 map_filename, GetLastError ());
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316 exit (-1);
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317 }
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318
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319 while (fgets (buffer, sizeof (buffer), map))
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320 {
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321 if (!(strstr (buffer, ".bss") && strstr (buffer, "DATA")))
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322 continue;
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323 n = sscanf (buffer, " %*d:%x %x", &start, &len);
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324 if (n != 2)
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325 {
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326 printf ("Failed to scan the .bss section line:\n%s", buffer);
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327 exit (-1);
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328 }
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329 break;
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330 }
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331 *p_bss_start = (PUCHAR) start;
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332 *p_bss_size = (DWORD) len;
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333 }
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334 #endif
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335
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336 /* Flip through the executable and cache the info necessary for dumping. */
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337 static void
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338 get_section_info (file_data *p_infile)
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339 {
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340 PIMAGE_DOS_HEADER dos_header;
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341 PIMAGE_NT_HEADERS nt_header;
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342 PIMAGE_SECTION_HEADER section, data_section;
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343 unsigned char *ptr;
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344 int i;
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345
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346 dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
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347 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
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348 {
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349 printf ("Unknown EXE header in %s...bailing.\n", p_infile->name);
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350 exit (1);
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351 }
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352 nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
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353 dos_header->e_lfanew);
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354 if (nt_header == NULL)
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355 {
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356 printf ("Failed to find IMAGE_NT_HEADER in %s...bailing.\n",
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357 p_infile->name);
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358 exit (1);
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359 }
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360
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361 /* Check the NT header signature ... */
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362 if (nt_header->Signature != IMAGE_NT_SIGNATURE)
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363 {
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364 printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
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365 nt_header->Signature, p_infile->name);
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366 }
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367
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368 /* Flip through the sections for .data and .bss ... */
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369 section = (PIMAGE_SECTION_HEADER) IMAGE_FIRST_SECTION (nt_header);
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370 for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
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371 {
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372 #ifndef DUMP_SEPARATE_SECTION
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373 if (!strcmp (section->Name, ".bss"))
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374 {
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375 extern int my_ebss; /* From lastfile.c */
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376
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377 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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378 section->VirtualAddress;
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379 bss_start = ptr;
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380 bss_size = (char*)&my_ebss - (char*)bss_start;
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381 }
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382
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383 if (!strcmp (section->Name, ".data"))
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384 #else
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385 if (!strcmp (section->Name, "xdata"))
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386 #endif
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387 {
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388 extern char my_edata[]; /* From lastfile.c */
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389
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390 /* The .data section. */
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391 data_section = section;
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392 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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393 section->VirtualAddress;
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394 data_start_va = ptr;
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395 data_start_file = section->PointerToRawData;
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396
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397 #ifndef DUMP_SEPARATE_SECTION
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398 /* Write only the part of the section that contains emacs data. */
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399 data_size = my_edata - data_start_va;
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400 #else
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401 /* Write back the full section. */
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402 data_size = section->SizeOfRawData;
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403
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404 /* This code doesn't know how to grow the raw size of a section. */
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405 if (section->SizeOfRawData < section->Misc.VirtualSize)
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406 {
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407 printf ("The emacs data section is smaller than expected"
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408 "...bailing.\n");
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409 exit (1);
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410 }
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411 #endif
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412 }
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413 section++;
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414 }
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415
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416 #ifndef DUMP_SEPARATE_SECTION
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417 if (bss_start == UNINIT_PTR)
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418 {
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419 /* Starting with MSVC 4.0, the .bss section has been eliminated
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420 and appended virtually to the end of the .data section. Our
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421 only hint about where the .bss section starts in the address
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422 comes from the SizeOfRawData field in the .data section
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423 header. Unfortunately, this field is only approximate, as it
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424 is a rounded number and is typically rounded just beyond the
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425 start of the .bss section. To find the start and size of the
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426 .bss section exactly, we have to peek into the map file. */
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427 extern int my_ebss;
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428
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429 get_bss_info_from_map_file (p_infile, &ptr, &bss_size);
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430 bss_start = ptr + nt_header->OptionalHeader.ImageBase
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431 + data_section->VirtualAddress;
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432 bss_size = (char*)&my_ebss - (char*)bss_start;
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433 }
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434 #else
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435 bss_size = 0;
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436 #endif
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437 }
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438
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439
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440 /* The dump routines. */
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441
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442 #ifdef DEBUG_XEMACS
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443 #define DUMP_MSG(x) printf x
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444 #else
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445 #define DUMP_MSG(x)
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446 #endif
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447
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448 static void
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449 copy_executable_and_dump_data_section (file_data *p_infile,
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450 file_data *p_outfile)
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451 {
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452 unsigned char *data_file, *data_va;
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453 unsigned long size, index;
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454
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455 /* Get a pointer to where the raw data should go in the executable file. */
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456 data_file = (char *) p_outfile->file_base + data_start_file;
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457
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458 /* Get a pointer to the raw data in our address space. */
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459 data_va = data_start_va;
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460
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461 size = (DWORD) data_file - (DWORD) p_outfile->file_base;
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462 DUMP_MSG (("Copying executable up to data section...\n"));
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463 DUMP_MSG (("\t0x%08x Offset in input file.\n", 0));
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464 DUMP_MSG (("\t0x%08x Offset in output file.\n", 0));
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465 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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466 memcpy (p_outfile->file_base, p_infile->file_base, size);
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467
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468 size = data_size;
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469 DUMP_MSG (("Dumping data section...\n"));
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470 DUMP_MSG (("\t0x%08x Address in process.\n", data_va));
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471 DUMP_MSG (("\t0x%08x Offset in output file.\n",
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472 data_file - p_outfile->file_base));
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473 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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474 memcpy (data_file, data_va, size);
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475
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476 index = (DWORD) data_file + size - (DWORD) p_outfile->file_base;
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477 size = p_infile->size - index;
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478 DUMP_MSG (("Copying rest of executable...\n"));
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479 DUMP_MSG (("\t0x%08x Offset in input file.\n", index));
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480 DUMP_MSG (("\t0x%08x Offset in output file.\n", index));
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481 DUMP_MSG (("\t0x%08x Size in bytes.\n", size));
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482 memcpy ((char *) p_outfile->file_base + index,
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483 (char *) p_infile->file_base + index, size);
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484 }
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485
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486 static void
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487 dump_bss_and_heap (file_data *p_infile, file_data *p_outfile)
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488 {
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489 unsigned char *heap_data;
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490 unsigned long size, index;
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491
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492 DUMP_MSG (("Dumping heap onto end of executable...\n"));
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493
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494 index = heap_index_in_executable;
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495 size = get_committed_heap_size ();
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496 heap_data = get_heap_start ();
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497
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498 DUMP_MSG (("\t0x%08x Heap start in process.\n", heap_data));
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499 DUMP_MSG (("\t0x%08x Heap offset in executable.\n", index));
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500 DUMP_MSG (("\t0x%08x Heap size in bytes.\n", size));
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501
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502 memcpy ((PUCHAR) p_outfile->file_base + index, heap_data, size);
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503
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504 #ifndef DUMP_SEPARATE_SECTION
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505 DUMP_MSG (("Dumping bss onto end of executable...\n"));
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506
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507 index += size;
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508 size = bss_size;
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509
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510 DUMP_MSG (("\t0x%08x BSS start in process.\n", bss_start));
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511 DUMP_MSG (("\t0x%08x BSS offset in executable.\n", index));
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512 DUMP_MSG (("\t0x%08x BSS size in bytes.\n", size));
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513 memcpy ((char *) p_outfile->file_base + index, bss_start, size);
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514 #endif
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515 }
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516
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517 #undef DUMP_MSG
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518
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519 /* Reload and remap routines. */
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520
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521
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522 /* Load the dumped .bss section into the .bss area of our address space. */
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523 /* Already done if the .bss was part of a separate emacs data section */
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524 void
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525 read_in_bss (char *filename)
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526 {
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527 #ifndef DUMP_SEPARATE_SECTION
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528 HANDLE file;
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529 unsigned long index, n_read;
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530
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531 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
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532 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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533 if (file == INVALID_HANDLE_VALUE)
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534 abort ();
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535
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536 /* Seek to where the .bss section is tucked away after the heap... */
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537 index = heap_index_in_executable + get_committed_heap_size ();
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538 if (SetFilePointer (file, index, NULL, FILE_BEGIN) == 0xFFFFFFFF)
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539 abort ();
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540
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541 /* Ok, read in the saved .bss section and initialize all
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542 uninitialized variables. */
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543 if (!ReadFile (file, bss_start, bss_size, &n_read, NULL))
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544 abort ();
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545
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546 CloseHandle (file);
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547 #endif
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548 }
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549
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550 /* Map the heap dumped into the executable file into our address space. */
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551 void
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552 map_in_heap (char *filename)
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553 {
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554 HANDLE file;
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|
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555 HANDLE file_mapping;
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556 void *file_base;
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557 unsigned long size, upper_size, n_read;
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558
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559 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
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560 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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561 if (file == INVALID_HANDLE_VALUE)
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562 abort ();
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563
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564 size = GetFileSize (file, &upper_size);
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565 file_mapping = CreateFileMapping (file, NULL, PAGE_WRITECOPY,
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566 0, size, NULL);
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567 if (!file_mapping)
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568 abort ();
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569
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570 size = get_committed_heap_size ();
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571 file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0,
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572 heap_index_in_executable, size,
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573 get_heap_start ());
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574 if (file_base != 0)
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575 {
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576 return;
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|
|
577 }
|
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578
|
|
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579 /* If we don't succeed with the mapping, then copy from the
|
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580 data into the heap. */
|
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581
|
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582 CloseHandle (file_mapping);
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583
|
|
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584 if (VirtualAlloc (get_heap_start (), get_committed_heap_size (),
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585 MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL)
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586 abort ();
|
|
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587
|
|
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588 /* Seek to the location of the heap data in the executable. */
|
|
|
589 if (SetFilePointer (file, heap_index_in_executable,
|
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590 NULL, FILE_BEGIN) == 0xFFFFFFFF)
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591 abort ();
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592
|
|
|
593 /* Read in the data. */
|
|
|
594 if (!ReadFile (file, get_heap_start (),
|
|
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595 get_committed_heap_size (), &n_read, NULL))
|
|
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596 abort ();
|
|
|
597
|
|
|
598 CloseHandle (file);
|
|
|
599 }
|
