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428
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1 /* unexec for GNU Emacs on Cygwin32.
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2 Copyright (C) 1994, 1998 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 */
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22
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23 /* This is a complete rewrite, some code snarfed from unexnt.c and
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24 unexec.c, Andy Piper (andy@xemacs.org) 13-1-98 */
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25
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28 #include <unistd.h>
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29 #include <fcntl.h>
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30 #include <config.h>
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31 #include <string.h>
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32 #include "sysfile.h"
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33 #define PERROR(arg) perror(arg);exit(-1)
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34
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35 #ifndef HAVE_A_OUT_H
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36 unexec (char *, char *, void *, void *, void *)
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37 {
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38 PERROR("cannot unexec() a.out.h not installed");
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39 }
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40 #else
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41
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42 #undef CONST
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430
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43 #ifndef MAX_PATH
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44 #define MAX_PATH 260
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45 #endif
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428
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46 #include <a.out.h>
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47
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48 #define ALLOC_UNIT 0xFFFF
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49 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
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50 #define ALIGN_ALLOC(addr) \
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51 ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
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52
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53 /* To prevent zero-initialized variables from being placed into the bss
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54 section, use non-zero values to represent an uninitialized state. */
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55 #define UNINIT_PTR ((void *) 0xF0A0F0A0)
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56 #define UNINIT_LONG (0xF0A0F0A0L)
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57
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58 static void get_section_info (int a_out, char* a_name);
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59 static void copy_executable_and_dump_data_section (int a_out, int a_new);
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60 static void dup_file_area(int a_out, int a_new, long size);
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61 #if 0
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62 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval);
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63 #endif
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64
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65 /* Cached info about the .data section in the executable. */
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66 void* data_start_va = UNINIT_PTR;
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67 unsigned long data_size = UNINIT_LONG;
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68
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69 /* Cached info about the .bss section in the executable. */
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70 void* bss_start = UNINIT_PTR;
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71 unsigned long bss_size = UNINIT_LONG;
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72 int sections_reversed = 0;
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73 FILHDR f_hdr;
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74 PEAOUTHDR f_ohdr;
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75 SCNHDR f_data, f_bss, f_text, f_nextdata;
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76
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77 #define PERROR(arg) perror(arg);exit(-1)
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78 #define CHECK_AOUT_POS(a) \
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79 if (lseek(a_out, 0, SEEK_CUR) != a) \
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80 { \
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81 printf("we are at %lx, should be at %lx\n", \
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82 lseek(a_out, 0, SEEK_CUR), a); \
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83 exit(-1); \
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84 }
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85
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86 /* Dump out .data and .bss sections into a new executable. */
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87 void unexec (char *out_name, char *in_name, void *start_data,
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88 void * d1, void * d2)
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89 {
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90 /* ugly nt hack - should be in lisp */
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91 int a_new, a_out = -1;
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92 char new_name[MAX_PATH], a_name[MAX_PATH];
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93 char *ptr;
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94
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95 /* Make sure that the input and output filenames have the
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96 ".exe" extension...patch them up if they don't. */
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97 strcpy (a_name, in_name);
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98 ptr = a_name + strlen (a_name) - 4;
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99 if (strcmp (ptr, ".exe"))
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100 strcat (a_name, ".exe");
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101
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102 strcpy (new_name, out_name);
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103 ptr = new_name + strlen (new_name) - 4;
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104 if (strcmp (ptr, ".exe"))
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105 strcat (new_name, ".exe");
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106
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107 /* We need to round off our heap to NT's allocation unit (64KB). */
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108 /* round_heap (get_allocation_unit ()); */
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109
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110 if (a_name && (a_out = open (a_name, O_RDONLY | OPEN_BINARY)) < 0)
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111 {
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112 PERROR (a_name);
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113 }
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114
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115 if ((a_new = open (new_name, O_WRONLY | O_TRUNC | O_CREAT | OPEN_BINARY,
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116 CREAT_MODE)) < 0)
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117 {
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118 PERROR (new_name);
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119 }
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120
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121 /* Get the interesting section info, like start and size of .bss... */
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122 get_section_info (a_out, a_name);
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123
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124 copy_executable_and_dump_data_section (a_out, a_new);
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125
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126 close(a_out);
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127 close(a_new);
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128 }
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129
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130 /* Flip through the executable and cache the info necessary for dumping. */
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131 static void get_section_info (int a_out, char* a_name)
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132 {
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133 extern int my_ebss;
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134 /* From lastfile.c */
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135 extern char my_edata[];
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136
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137 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
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138 {
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139 PERROR (a_name);
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140 }
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141
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142 if (f_hdr.e_magic != DOSMAGIC)
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143 {
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144 PERROR("unknown exe header");
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145 }
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146
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147 /* Check the NT header signature ... */
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148 if (f_hdr.nt_signature != NT_SIGNATURE)
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149 {
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150 PERROR("invalid nt header");
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151 }
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152
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153 /* Flip through the sections for .data and .bss ... */
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154 if (f_hdr.f_opthdr > 0)
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155 {
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156 if (read (a_out, &f_ohdr, AOUTSZ) != AOUTSZ)
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157 {
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158 PERROR (a_name);
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159 }
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160 }
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161 /* Loop through .data & .bss section headers, copying them in.
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162 With newer lds these are reversed so we have to cope with both */
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163 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
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164
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165 if (read (a_out, &f_text, sizeof (f_text)) != sizeof (f_text)
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166 ||
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167 strcmp (f_text.s_name, ".text"))
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168 {
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169 PERROR ("no .text section");
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170 }
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171
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172 /* The .bss section. */
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173 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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174 ||
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175 (strcmp (f_bss.s_name, ".bss") && strcmp (f_bss.s_name, ".data")))
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176 {
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177 PERROR ("no .bss / .data section");
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178 }
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179
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180 /* check for reversed .bss and .data */
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181 if (!strcmp(f_bss.s_name, ".data"))
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182 {
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183 printf(".data and .bss reversed\n");
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184 sections_reversed = 1;
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185 memcpy(&f_data, &f_bss, sizeof(f_bss));
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186 }
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187
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188 /* The .data section. */
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189 if (!sections_reversed)
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190 {
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191 if (read (a_out, &f_data, sizeof (f_data)) != sizeof (f_data)
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192 ||
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193 strcmp (f_data.s_name, ".data"))
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194 {
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195 PERROR ("no .data section");
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196 }
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197 }
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198 else
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199 {
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200 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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201 ||
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202 strcmp (f_bss.s_name, ".bss"))
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203 {
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204 PERROR ("no .bss section");
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205 }
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206 }
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207
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208 bss_start = (void *) ((char*)f_ohdr.ImageBase + f_bss.s_vaddr);
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209 bss_size = (unsigned long)((char*)&my_ebss-(char*)bss_start);
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210
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211 /* must keep bss data that we want to be blank as blank */
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212 printf("found bss - keeping %lx of %lx bytes\n", bss_size, f_ohdr.bsize);
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213
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214 /* The .data section. */
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215 data_start_va = (void *) ((char*)f_ohdr.ImageBase + f_data.s_vaddr);
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216
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217 /* We want to only write Emacs data back to the executable,
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218 not any of the library data (if library data is included,
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219 then a dumped Emacs won't run on system versions other
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220 than the one Emacs was dumped on). */
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221 data_size = (unsigned long)my_edata - (unsigned long)data_start_va;
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222 printf("found data - keeping %lx of %lx bytes\n", data_size, f_ohdr.dsize);
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223
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224 /* The following data section - often .idata */
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225 if (read (a_out, &f_nextdata, sizeof (f_nextdata)) != sizeof (f_nextdata)
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226 &&
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227 strcmp (&f_nextdata.s_name[2], "data"))
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228 {
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229 PERROR ("no other data section");
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230 }
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231 }
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232
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233 /* The dump routines. */
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234
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235 static void
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236 copy_executable_and_dump_data_section (int a_out, int a_new)
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237 {
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238 long size=0;
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239 unsigned long new_data_size, new_bss_size,
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240 bss_padding, file_sz_change, data_padding=0,
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241 f_data_s_vaddr = f_data.s_vaddr,
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242 f_data_s_scnptr = f_data.s_scnptr,
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243 f_bss_s_vaddr = f_bss.s_vaddr,
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244 f_nextdata_s_scnptr = f_nextdata.s_scnptr;
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245
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246 int i;
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247 void* empty_space;
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248 extern int static_heap_dumped;
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249 SCNHDR section;
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250 /* calculate new sizes f_ohdr.dsize is the total initialized data
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251 size on disk which is f_data.s_size + f_idata.s_size.
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252 f_ohdr.data_start is the base addres of all data and so should
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253 not be changed. *.s_vaddr is the virtual address of the start
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254 of the section normalzed from f_ohdr.ImageBase. *.s_paddr
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255 appears to be the number of bytes in the section actually used
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256 (whereas *.s_size is aligned).
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257
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258 bsize is now 0 since subsumed into .data
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259 dsize is dsize + (f_data.s_vaddr - f_bss.s_vaddr)
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260 f_data.s_vaddr is f_bss.s_vaddr
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261 f_data.s_size is new dsize maybe.
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262 what about s_paddr & s_scnptr? */
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263
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264 /* this is the amount the file increases in size */
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265 if (!sections_reversed)
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266 {
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267 new_bss_size = f_data.s_vaddr - f_bss.s_vaddr;
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268 data_padding = 0;
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269 }
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270 else
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271 {
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272 new_bss_size = f_nextdata.s_vaddr - f_bss.s_vaddr;
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273 data_padding = (f_bss.s_vaddr - f_data.s_vaddr) - f_data.s_size;
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274 }
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275
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276 file_sz_change=new_bss_size + data_padding;
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277 new_data_size=f_ohdr.dsize + file_sz_change;
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278
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279 if (!sections_reversed)
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280 {
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281 f_data.s_vaddr = f_bss.s_vaddr;
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282 }
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283 f_data.s_paddr += file_sz_change;
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284 #if 0
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285 if (f_data.s_size + f_nextdata.s_size != f_ohdr.dsize)
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286 {
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287 printf("section size doesn't tally with dsize %lx != %lx\n",
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288 f_data.s_size + f_nextdata.s_size, f_ohdr.dsize);
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289 }
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290 #endif
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291 f_data.s_size += file_sz_change;
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292 lseek (a_new, 0, SEEK_SET);
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293 /* write file header */
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294 f_hdr.f_symptr += file_sz_change;
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295 f_hdr.f_nscns--;
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296 printf("writing file header\n");
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297 if (write(a_new, &f_hdr, sizeof(f_hdr)) != sizeof(f_hdr))
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298 {
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299 PERROR("failed to write file header");
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300 }
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301 /* write optional header fixing dsize & bsize*/
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302 printf("writing optional header\n");
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303 printf("new data size is %lx, >= %lx\n", new_data_size,
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304 f_ohdr.dsize + f_ohdr.bsize);
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305 if (new_data_size < f_ohdr.dsize + f_ohdr.bsize )
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306 {
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307 PERROR("new data size is < approx");
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308 }
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309 f_ohdr.dsize=new_data_size;
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310 f_ohdr.bsize=0;
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311 if (write(a_new, &f_ohdr, sizeof(f_ohdr)) != sizeof(f_ohdr))
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312 {
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313 PERROR("failed to write optional header");
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314 }
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315 /* write text as is */
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316 printf("writing text header (unchanged)\n");
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317
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318 if (write(a_new, &f_text, sizeof(f_text)) != sizeof(f_text))
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319 {
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320 PERROR("failed to write text header");
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321 }
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322
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323 /* write new data header */
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324 printf("writing .data header\n");
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325
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326 if (write(a_new, &f_data, sizeof(f_data)) != sizeof(f_data))
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327 {
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328 PERROR("failed to write data header");
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329 }
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330
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331 printf("writing following data header\n");
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332 f_nextdata.s_scnptr += file_sz_change;
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333 if (f_nextdata.s_lnnoptr != 0) f_nextdata.s_lnnoptr += file_sz_change;
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334 if (f_nextdata.s_relptr != 0) f_nextdata.s_relptr += file_sz_change;
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335 if (write(a_new, &f_nextdata, sizeof(f_nextdata)) != sizeof(f_nextdata))
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336 {
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337 PERROR("failed to write nextdata header");
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338 }
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339
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340 /* copy other section headers adjusting the file offset */
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341 for (i=0; i<(f_hdr.f_nscns-3); i++)
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342 {
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343 if (read (a_out, §ion, sizeof (section)) != sizeof (section))
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344 {
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345 PERROR ("no .data section");
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346 }
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347
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348 section.s_scnptr += file_sz_change;
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349 if (section.s_lnnoptr != 0) section.s_lnnoptr += file_sz_change;
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350 if (section.s_relptr != 0) section.s_relptr += file_sz_change;
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351
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352 if (write(a_new, §ion, sizeof(section)) != sizeof(section))
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353 {
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354 PERROR("failed to write data header");
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355 }
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356 }
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357
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358 /* dump bss to maintain offsets */
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359 memset(&f_bss, 0, sizeof(f_bss));
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360 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
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361 {
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362 PERROR("failed to write bss header");
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363 }
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364
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365 size=lseek(a_new, 0, SEEK_CUR);
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366 CHECK_AOUT_POS(size);
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367
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368 /* copy eveything else until start of data */
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369 size = f_data_s_scnptr - lseek (a_out, 0, SEEK_CUR);
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370
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371 printf ("copying executable up to data section ... %lx bytes\n",
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372 size);
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373 dup_file_area(a_out, a_new, size);
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374
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375 CHECK_AOUT_POS(f_data_s_scnptr);
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376
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377 if (!sections_reversed)
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378 {
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379 /* dump bss + padding between sections */
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|
380 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
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381 if (write(a_new, bss_start, bss_size) != (int)bss_size)
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382 {
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383 PERROR("failed to write bss section");
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384 }
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385
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386 /* pad, needs to be zero */
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387 bss_padding = new_bss_size - bss_size;
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388 printf ("padding .bss ... %lx bytes\n", bss_padding);
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389 empty_space = malloc(bss_padding);
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390 memset(empty_space, 0, bss_padding);
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391 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
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392 {
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393 PERROR("failed to write bss section");
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394 }
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395 free(empty_space);
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396 }
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397
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398 /* tell dumped version not to free pure heap */
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399 static_heap_dumped = 1;
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400 /* Get a pointer to the raw data in our address space. */
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401 printf ("dumping .data section... %lx bytes\n", data_size);
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402 if (write(a_new, data_start_va, data_size) != (int)data_size)
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403 {
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404 PERROR("failed to write data section");
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405 }
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406 /* were going to use free again ... */
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407 static_heap_dumped = 0;
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408
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409 size = lseek(a_out, f_data_s_scnptr + data_size, SEEK_SET);
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410
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411 if (!sections_reversed)
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412 {
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413 size = f_nextdata_s_scnptr - size;
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414 dup_file_area(a_out, a_new, size);
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415 }
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416 else
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417 {
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418 /* need to bad to bss with data in file */
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419 printf ("padding .data ... %lx bytes\n", data_padding);
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420 size = (f_bss_s_vaddr - f_data_s_vaddr) - data_size;
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421 dup_file_area(a_out, a_new, size);
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422
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|
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423 /* dump bss + padding between sections */
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424 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
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425 if (write(a_new, bss_start, bss_size) != (int)bss_size)
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|
|
426 {
|
|
|
427 PERROR("failed to write bss section");
|
|
|
428 }
|
|
|
429
|
|
|
430 /* pad, needs to be zero */
|
|
|
431 bss_padding = new_bss_size - bss_size;
|
|
|
432 printf ("padding .bss ... %lx bytes\n", bss_padding);
|
|
|
433 empty_space = malloc(bss_padding);
|
|
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434 memset(empty_space, 0, bss_padding);
|
|
|
435 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
|
|
|
436 {
|
|
|
437 PERROR("failed to write bss section");
|
|
|
438 }
|
|
|
439 free(empty_space);
|
|
|
440 if (lseek(a_new, 0, SEEK_CUR) != f_nextdata.s_scnptr)
|
|
|
441 {
|
|
|
442 printf("at %lx should be at %lx\n",
|
|
|
443 lseek(a_new, 0, SEEK_CUR),
|
|
|
444 f_nextdata.s_scnptr);
|
|
|
445 PERROR("file positioning error\n");
|
|
|
446 }
|
|
|
447 lseek(a_out, f_nextdata_s_scnptr, SEEK_SET);
|
|
|
448 }
|
|
|
449
|
|
|
450 CHECK_AOUT_POS(f_nextdata_s_scnptr);
|
|
|
451
|
|
|
452 /* now dump - nextdata don't need to do this cygwin ds is in .data! */
|
|
|
453 printf ("dumping following data section... %lx bytes\n", f_nextdata.s_size);
|
|
|
454
|
|
|
455 dup_file_area(a_out,a_new,f_nextdata.s_size);
|
|
|
456
|
|
|
457 /* write rest of file */
|
|
|
458 printf ("writing rest of file\n");
|
|
|
459 size = lseek(a_out, 0, SEEK_END);
|
|
|
460 size = size - (f_nextdata_s_scnptr + f_nextdata.s_size); /* length remaining in a_out */
|
|
|
461 lseek(a_out, f_nextdata_s_scnptr + f_nextdata.s_size, SEEK_SET);
|
|
|
462
|
|
|
463 dup_file_area(a_out, a_new, size);
|
|
|
464 }
|
|
|
465
|
|
|
466 /*
|
|
|
467 * copy from aout to anew
|
|
|
468 */
|
|
|
469 static void dup_file_area(int a_out, int a_new, long size)
|
|
|
470 {
|
|
|
471 char page[BUFSIZ];
|
|
|
472 long n;
|
|
|
473 for (; size > 0; size -= sizeof (page))
|
|
|
474 {
|
|
|
475 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
476 if (read (a_out, page, n) != n || write (a_new, page, n) != n)
|
|
|
477 {
|
|
|
478 PERROR ("dump_out()");
|
|
|
479 }
|
|
|
480 }
|
|
|
481 }
|
|
|
482
|
|
|
483 #if 0
|
|
|
484 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval)
|
|
|
485 {
|
|
|
486 int cpos;
|
|
|
487
|
|
|
488 cpos = lseek(a_new, 0, SEEK_CUR);
|
|
|
489 if (va < bss_start || va > bss_start + f_data.s_size)
|
|
|
490 {
|
|
|
491 PERROR("address not in data space\n");
|
|
|
492 }
|
|
|
493 lseek(a_new, f_data.s_scnptr + ((unsigned long)va -
|
|
|
494 (unsigned long)bss_start), SEEK_SET);
|
|
|
495 if (write(a_new, newval, sizeof(int)) != (int)sizeof(int))
|
|
|
496 {
|
|
|
497 PERROR("failed to write int value");
|
|
|
498 }
|
|
|
499 lseek(a_new, cpos, SEEK_SET);
|
|
|
500 }
|
|
|
501 #endif
|
|
|
502
|
|
|
503 #endif /* HAVE_A_OUT_H */
|
