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