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100
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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 #include <stdlib.h> /* _fmode */
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26 #include <stdio.h>
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27 #include <fcntl.h>
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28 #include <windows.h>
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29
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30 #if 0
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31 extern BOOL ctrl_c_handler (unsigned long type);
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32 #endif
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33
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34 #include "ntheap.h"
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35
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36 /* A convenient type for keeping all the info about a mapped file together. */
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37 typedef struct file_data {
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38 char *name;
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39 unsigned long size;
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40 HANDLE file;
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41 HANDLE file_mapping;
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42 unsigned char *file_base;
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43 } file_data;
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44
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169
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45 enum {
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46 HEAP_UNINITIALIZED = 1,
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47 HEAP_UNLOADED,
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48 HEAP_LOADED
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49 };
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50
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100
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51 /* Basically, our "initialized" flag. */
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169
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52 int heap_state = HEAP_UNINITIALIZED;
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100
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53
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54 /* So we can find our heap in the file to recreate it. */
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169
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55 unsigned long heap_index_in_executable = UNINIT_LONG;
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100
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56
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57 void open_input_file (file_data *p_file, char *name);
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58 void open_output_file (file_data *p_file, char *name, unsigned long size);
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59 void close_file_data (file_data *p_file);
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60
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61 void get_section_info (file_data *p_file);
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62 void copy_executable_and_dump_data_section (file_data *, file_data *);
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63 void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
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64
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65 /* Cached info about the .data section in the executable. */
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169
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66 PUCHAR data_start_va = UNINIT_PTR;
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67 DWORD data_start_file = UNINIT_LONG;
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68 DWORD data_size = UNINIT_LONG;
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100
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69
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70 /* Cached info about the .bss section in the executable. */
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169
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71 PUCHAR bss_start = UNINIT_PTR;
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72 DWORD bss_size = UNINIT_LONG;
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100
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73
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74 #ifdef HAVE_NTGUI
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75 HINSTANCE hinst = NULL;
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76 HINSTANCE hprevinst = NULL;
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77 LPSTR lpCmdLine = "";
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78 int nCmdShow = 0;
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79 #endif /* HAVE_NTGUI */
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80
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81 /* Startup code for running on NT. When we are running as the dumped
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82 version, we need to bootstrap our heap and .bss section into our
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83 address space before we can actually hand off control to the startup
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84 code supplied by NT (primarily because that code relies upon malloc ()). */
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85 void
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86 _start (void)
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87 {
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88 extern void mainCRTStartup (void);
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89
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90 /* Cache system info, e.g., the NT page size. */
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91 cache_system_info ();
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92
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93 /* If we're a dumped version of emacs then we need to recreate
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94 our heap and play tricks with our .bss section. Do this before
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95 start up. (WARNING: Do not put any code before this section
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96 that relies upon malloc () and runs in the dumped version. It
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97 won't work.) */
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169
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98 if (heap_state == HEAP_UNLOADED)
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100
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99 {
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100 char executable_path[MAX_PATH];
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101
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102 if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0)
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103 {
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104 exit (1);
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105 }
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106 recreate_heap (executable_path);
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169
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107 heap_state = HEAP_LOADED;
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100
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108 }
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109
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110 /* The default behavior is to treat files as binary and patch up
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111 text files appropriately, in accordance with the MSDOS code. */
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112 _fmode = O_BINARY;
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113
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114 #if 0
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115 /* This prevents ctrl-c's in shells running while we're suspended from
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116 having us exit. */
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117 SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
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118 #endif
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119
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120 /* Invoke the NT CRT startup routine now that our housecleaning
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121 is finished. */
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122 #ifdef HAVE_NTGUI
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123 /* determine WinMain args like crt0.c does */
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124 hinst = GetModuleHandle(NULL);
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125 lpCmdLine = GetCommandLine();
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126 nCmdShow = SW_SHOWDEFAULT;
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127 #endif
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128 mainCRTStartup ();
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129 }
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130
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131 /* Dump out .data and .bss sections into a new executable. */
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132 void
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133 unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
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134 void *entry_address)
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135 {
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136 file_data in_file, out_file;
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137 char out_filename[MAX_PATH], in_filename[MAX_PATH];
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138 unsigned long size;
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139 char *ptr;
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140
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141 /* Make sure that the input and output filenames have the
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142 ".exe" extension...patch them up if they don't. */
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143 strcpy (in_filename, old_name);
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144 ptr = in_filename + strlen (in_filename) - 4;
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145 if (strcmp (ptr, ".exe"))
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146 strcat (in_filename, ".exe");
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147
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148 strcpy (out_filename, new_name);
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149 ptr = out_filename + strlen (out_filename) - 4;
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150 if (strcmp (ptr, ".exe"))
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151 strcat (out_filename, ".exe");
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152
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153 printf ("Dumping from %s\n", in_filename);
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154 printf (" to %s\n", out_filename);
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155
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156 /* We need to round off our heap to NT's allocation unit (64KB). */
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157 round_heap (get_allocation_unit ());
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158
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159 /* Open the undumped executable file. */
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160 open_input_file (&in_file, in_filename);
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161
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162 /* Get the interesting section info, like start and size of .bss... */
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163 get_section_info (&in_file);
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164
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165 /* The size of the dumped executable is the size of the original
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166 executable plus the size of the heap and the size of the .bss section. */
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167 heap_index_in_executable = (unsigned long)
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168 round_to_next ((unsigned char *) in_file.size, get_allocation_unit ());
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169 size = heap_index_in_executable + get_committed_heap_size () + bss_size;
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170 open_output_file (&out_file, out_filename, size);
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171
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172 /* Set the flag (before dumping). */
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169
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173 heap_state = HEAP_UNLOADED;
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100
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174
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175 copy_executable_and_dump_data_section (&in_file, &out_file);
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176 dump_bss_and_heap (&in_file, &out_file);
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177
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178 close_file_data (&in_file);
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179 close_file_data (&out_file);
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180 }
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181
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182
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183 /* File handling. */
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184
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185
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186 void
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187 open_input_file (file_data *p_file, char *filename)
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188 {
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189 HANDLE file;
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190 HANDLE file_mapping;
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191 void *file_base;
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192 unsigned long size, upper_size;
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193
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194 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
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195 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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196 if (file == INVALID_HANDLE_VALUE)
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197 {
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198 printf ("Failed to open %s (%d)...bailing.\n",
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199 filename, GetLastError ());
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200 exit (1);
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201 }
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202
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203 size = GetFileSize (file, &upper_size);
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204 file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY,
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205 0, size, NULL);
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206 if (!file_mapping)
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207 {
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208 printf ("Failed to create file mapping of %s (%d)...bailing.\n",
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209 filename, GetLastError ());
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210 exit (1);
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211 }
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212
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213 file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size);
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214 if (file_base == 0)
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215 {
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216 printf ("Failed to map view of file of %s (%d)...bailing.\n",
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217 filename, GetLastError ());
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218 exit (1);
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219 }
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220
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221 p_file->name = filename;
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222 p_file->size = size;
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223 p_file->file = file;
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224 p_file->file_mapping = file_mapping;
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225 p_file->file_base = file_base;
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226 }
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227
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228 void
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229 open_output_file (file_data *p_file, char *filename, unsigned long size)
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230 {
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231 HANDLE file;
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232 HANDLE file_mapping;
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233 void *file_base;
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234 int i;
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235
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236 file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
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237 CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
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238 if (file == INVALID_HANDLE_VALUE)
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239 {
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240 i = GetLastError ();
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241 printf ("open_output_file: Failed to open %s (%d).\n",
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242 filename, i);
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243 exit (1);
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244 }
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245
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246 file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
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247 0, size, NULL);
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248 if (!file_mapping)
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249 {
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250 i = GetLastError ();
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251 printf ("open_output_file: Failed to create file mapping of %s (%d).\n",
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252 filename, i);
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253 exit (1);
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254 }
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255
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256 file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
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257 if (file_base == 0)
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258 {
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259 i = GetLastError ();
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260 printf ("open_output_file: Failed to map view of file of %s (%d).\n",
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261 filename, i);
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262 exit (1);
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263 }
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264
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265 p_file->name = filename;
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266 p_file->size = size;
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267 p_file->file = file;
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268 p_file->file_mapping = file_mapping;
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269 p_file->file_base = file_base;
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270 }
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271
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272 /* Close the system structures associated with the given file. */
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273 static void
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274 close_file_data (file_data *p_file)
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275 {
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276 UnmapViewOfFile (p_file->file_base);
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277 CloseHandle (p_file->file_mapping);
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278 CloseHandle (p_file->file);
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279 }
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280
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281
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282 /* Routines to manipulate NT executable file sections. */
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283
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284 static void
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285 get_bss_info_from_map_file (file_data *p_infile, PUCHAR *p_bss_start,
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286 DWORD *p_bss_size)
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287 {
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288 int n, start, len;
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289 char map_filename[MAX_PATH];
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290 char buffer[256];
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291 FILE *map;
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292
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293 /* Overwrite the .exe extension on the executable file name with
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294 the .map extension. */
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295 strcpy (map_filename, p_infile->name);
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296 n = strlen (map_filename) - 3;
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297 strcpy (&map_filename[n], "map");
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298
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299 map = fopen (map_filename, "r");
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300 if (!map)
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301 {
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302 printf ("Failed to open map file %s, error %d...bailing out.\n",
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303 map_filename, GetLastError ());
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304 exit (-1);
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305 }
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306
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307 while (fgets (buffer, sizeof (buffer), map))
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308 {
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309 if (!(strstr (buffer, ".bss") && strstr (buffer, "DATA")))
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310 continue;
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311 n = sscanf (buffer, " %*d:%x %x", &start, &len);
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312 if (n != 2)
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313 {
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314 printf ("Failed to scan the .bss section line:\n%s", buffer);
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315 exit (-1);
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316 }
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317 break;
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318 }
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319 *p_bss_start = (PUCHAR) start;
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320 *p_bss_size = (DWORD) len;
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321 }
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322
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323 static unsigned long
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324 get_section_size (PIMAGE_SECTION_HEADER p_section)
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325 {
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326 /* The section size is in different locations in the different versions. */
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327 switch (get_nt_minor_version ())
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328 {
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329 case 10:
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330 return p_section->SizeOfRawData;
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331 default:
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332 return p_section->Misc.VirtualSize;
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333 }
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334 }
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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 if (!strcmp (section->Name, ".bss"))
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373 {
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374 /* The .bss section. */
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375 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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376 section->VirtualAddress;
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377 bss_start = ptr;
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378 bss_size = get_section_size (section);
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379 }
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380 if (!strcmp (section->Name, ".data"))
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381 {
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382 /* From lastfile.c */
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383 extern char my_edata[];
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384
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385 /* The .data section. */
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386 data_section = section;
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387 ptr = (char *) nt_header->OptionalHeader.ImageBase +
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388 section->VirtualAddress;
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389 data_start_va = ptr;
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390 data_start_file = section->PointerToRawData;
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391
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392 /* We want to only write Emacs data back to the executable,
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393 not any of the library data (if library data is included,
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394 then a dumped Emacs won't run on system versions other
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395 than the one Emacs was dumped on). */
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396 data_size = my_edata - data_start_va;
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397 }
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398 section++;
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399 }
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400
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169
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401 if (bss_start == UNINIT_PTR && bss_size == UNINIT_LONG)
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100
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402 {
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403 /* Starting with MSVC 4.0, the .bss section has been eliminated
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404 and appended virtually to the end of the .data section. Our
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405 only hint about where the .bss section starts in the address
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406 comes from the SizeOfRawData field in the .data section
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407 header. Unfortunately, this field is only approximate, as it
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408 is a rounded number and is typically rounded just beyond the
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409 start of the .bss section. To find the start and size of the
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410 .bss section exactly, we have to peek into the map file. */
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411 get_bss_info_from_map_file (p_infile, &ptr, &bss_size);
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412 bss_start = ptr + nt_header->OptionalHeader.ImageBase
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413 + data_section->VirtualAddress;
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414 }
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415 }
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416
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417
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418 /* The dump routines. */
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419
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420 static void
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421 copy_executable_and_dump_data_section (file_data *p_infile,
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422 file_data *p_outfile)
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423 {
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424 unsigned char *data_file, *data_va;
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425 unsigned long size, index;
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426
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427 /* Get a pointer to where the raw data should go in the executable file. */
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428 data_file = (char *) p_outfile->file_base + data_start_file;
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429
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430 /* Get a pointer to the raw data in our address space. */
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431 data_va = data_start_va;
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432
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433 size = (DWORD) data_file - (DWORD) p_outfile->file_base;
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434 printf ("Copying executable up to data section...\n");
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435 printf ("\t0x%08x Offset in input file.\n", 0);
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436 printf ("\t0x%08x Offset in output file.\n", 0);
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437 printf ("\t0x%08x Size in bytes.\n", size);
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438 memcpy (p_outfile->file_base, p_infile->file_base, size);
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439
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440 size = data_size;
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441 printf ("Dumping .data section...\n");
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442 printf ("\t0x%08x Address in process.\n", data_va);
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443 printf ("\t0x%08x Offset in output file.\n",
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444 data_file - p_outfile->file_base);
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445 printf ("\t0x%08x Size in bytes.\n", size);
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446 memcpy (data_file, data_va, size);
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447
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448 index = (DWORD) data_file + size - (DWORD) p_outfile->file_base;
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449 size = p_infile->size - index;
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450 printf ("Copying rest of executable...\n");
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451 printf ("\t0x%08x Offset in input file.\n", index);
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452 printf ("\t0x%08x Offset in output file.\n", index);
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453 printf ("\t0x%08x Size in bytes.\n", size);
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454 memcpy ((char *) p_outfile->file_base + index,
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455 (char *) p_infile->file_base + index, size);
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456 }
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457
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458 static void
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459 dump_bss_and_heap (file_data *p_infile, file_data *p_outfile)
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460 {
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461 unsigned char *heap_data, *bss_data;
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462 unsigned long size, index;
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463
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464 printf ("Dumping heap into executable...\n");
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465
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466 index = heap_index_in_executable;
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467 size = get_committed_heap_size ();
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468 heap_data = get_heap_start ();
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469
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470 printf ("\t0x%08x Heap start in process.\n", heap_data);
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471 printf ("\t0x%08x Heap offset in executable.\n", index);
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472 printf ("\t0x%08x Heap size in bytes.\n", size);
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473
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474 memcpy ((PUCHAR) p_outfile->file_base + index, heap_data, size);
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475
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476 printf ("Dumping .bss into executable...\n");
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477
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|
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478 index += size;
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479 size = bss_size;
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480 bss_data = bss_start;
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481
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|
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482 printf ("\t0x%08x BSS start in process.\n", bss_data);
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483 printf ("\t0x%08x BSS offset in executable.\n", index);
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|
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484 printf ("\t0x%08x BSS size in bytes.\n", size);
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|
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485 memcpy ((char *) p_outfile->file_base + index, bss_data, size);
|
|
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486 }
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487
|
|
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488
|
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|
489 /* Reload and remap routines. */
|
|
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490
|
|
|
491
|
|
|
492 /* Load the dumped .bss section into the .bss area of our address space. */
|
|
|
493 void
|
|
|
494 read_in_bss (char *filename)
|
|
|
495 {
|
|
|
496 HANDLE file;
|
|
|
497 unsigned long size, index, n_read, total_read;
|
|
|
498 char buffer[512], *bss;
|
|
|
499 int i;
|
|
|
500
|
|
|
501 file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
|
|
|
502 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
|
|
|
503 if (file == INVALID_HANDLE_VALUE)
|
|
|
504 {
|
|
|
505 i = GetLastError ();
|
|
|
506 exit (1);
|
|
|
507 }
|
|
|
508
|
|
|
509 /* Seek to where the .bss section is tucked away after the heap... */
|
|
|
510 index = heap_index_in_executable + get_committed_heap_size ();
|
|
|
511 if (SetFilePointer (file, index, NULL, FILE_BEGIN) == 0xFFFFFFFF)
|
|
|
512 {
|
|
|
513 i = GetLastError ();
|
|
|
514 exit (1);
|
|
|
515 }
|
|
|
516
|
|
|
517
|
|
|
518 /* Ok, read in the saved .bss section and initialize all
|
|
|
519 uninitialized variables. */
|
|
|
520 if (!ReadFile (file, bss_start, bss_size, &n_read, NULL))
|
|
|
521 {
|
|
|
522 i = GetLastError ();
|
|
|
523 exit (1);
|
|
|
524 }
|
|
|
525
|
|
|
526 CloseHandle (file);
|
|
|
527 }
|
|
|
528
|
|
|
529 /* Map the heap dumped into the executable file into our address space. */
|
|
|
530 void
|
|
|
531 map_in_heap (char *filename)
|
|
|
532 {
|
|
|
533 HANDLE file;
|
|
|
534 HANDLE file_mapping;
|
|
|
535 void *file_base;
|
|
|
536 unsigned long size, upper_size, n_read;
|
|
|
537 int i;
|
|
|
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 {
|
|
|
543 i = GetLastError ();
|
|
|
544 exit (1);
|
|
|
545 }
|
|
|
546
|
|
|
547 size = GetFileSize (file, &upper_size);
|
|
|
548 file_mapping = CreateFileMapping (file, NULL, PAGE_WRITECOPY,
|
|
|
549 0, size, NULL);
|
|
|
550 if (!file_mapping)
|
|
|
551 {
|
|
|
552 i = GetLastError ();
|
|
|
553 exit (1);
|
|
|
554 }
|
|
|
555
|
|
|
556 size = get_committed_heap_size ();
|
|
|
557 file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0,
|
|
|
558 heap_index_in_executable, size,
|
|
|
559 get_heap_start ());
|
|
|
560 if (file_base != 0)
|
|
|
561 {
|
|
|
562 return;
|
|
|
563 }
|
|
|
564
|
|
|
565 /* If we don't succeed with the mapping, then copy from the
|
|
|
566 data into the heap. */
|
|
|
567
|
|
|
568 CloseHandle (file_mapping);
|
|
|
569
|
|
|
570 if (VirtualAlloc (get_heap_start (), get_committed_heap_size (),
|
|
|
571 MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL)
|
|
|
572 {
|
|
|
573 i = GetLastError ();
|
|
|
574 exit (1);
|
|
|
575 }
|
|
|
576
|
|
|
577 /* Seek to the location of the heap data in the executable. */
|
|
|
578 i = heap_index_in_executable;
|
|
|
579 if (SetFilePointer (file, i, NULL, FILE_BEGIN) == 0xFFFFFFFF)
|
|
|
580 {
|
|
|
581 i = GetLastError ();
|
|
|
582 exit (1);
|
|
|
583 }
|
|
|
584
|
|
|
585 /* Read in the data. */
|
|
|
586 if (!ReadFile (file, get_heap_start (),
|
|
|
587 get_committed_heap_size (), &n_read, NULL))
|
|
|
588 {
|
|
|
589 i = GetLastError ();
|
|
|
590 exit (1);
|
|
|
591 }
|
|
|
592
|
|
|
593 CloseHandle (file);
|
|
|
594 }
|
