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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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448
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26 #include <config.h>
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27 #include "lisp.h"
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28
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428
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <string.h>
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442
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34
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35 #define DONT_ENCAPSULATE /* filenames are external in unex*.c */
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428
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36 #include "sysfile.h"
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442
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37
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428
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38 #define PERROR(arg) perror(arg);exit(-1)
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39
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40 #ifndef HAVE_A_OUT_H
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41 unexec (char *, char *, void *, void *, void *)
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42 {
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43 PERROR("cannot unexec() a.out.h not installed");
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44 }
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45 #else
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46
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430
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47 #ifndef MAX_PATH
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48 #define MAX_PATH 260
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49 #endif
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428
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50 #include <a.out.h>
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51
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52 #define ALLOC_UNIT 0xFFFF
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53 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
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54 #define ALIGN_ALLOC(addr) \
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55 ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
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444
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56 /* Note that all sections must be aligned on a 0x1000 boundary so
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57 this is the minimum size that our dummy bss can be. */
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448
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58 #ifndef NO_DEBUG
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444
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59 #define BSS_PAD_SIZE 0x1000
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446
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60 #else
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61 #define BSS_PAD_SIZE 0
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62 #endif
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428
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63
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64 /* To prevent zero-initialized variables from being placed into the bss
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65 section, use non-zero values to represent an uninitialized state. */
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66 #define UNINIT_PTR ((void *) 0xF0A0F0A0)
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67 #define UNINIT_LONG (0xF0A0F0A0L)
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68
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69 static void get_section_info (int a_out, char* a_name);
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70 static void copy_executable_and_dump_data_section (int a_out, int a_new);
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71 static void dup_file_area(int a_out, int a_new, long size);
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72 #if 0
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73 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval);
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74 #endif
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75
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76 /* Cached info about the .data section in the executable. */
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77 void* data_start_va = UNINIT_PTR;
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78 unsigned long data_size = UNINIT_LONG;
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79
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80 /* Cached info about the .bss section in the executable. */
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81 void* bss_start = UNINIT_PTR;
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82 unsigned long bss_size = UNINIT_LONG;
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83 int sections_reversed = 0;
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84 FILHDR f_hdr;
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85 PEAOUTHDR f_ohdr;
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86 SCNHDR f_data, f_bss, f_text, f_nextdata;
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87
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88 #define PERROR(arg) perror(arg);exit(-1)
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89 #define CHECK_AOUT_POS(a) \
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90 if (lseek(a_out, 0, SEEK_CUR) != a) \
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91 { \
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92 printf("we are at %lx, should be at %lx\n", \
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93 lseek(a_out, 0, SEEK_CUR), a); \
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94 exit(-1); \
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95 }
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96
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97 /* Dump out .data and .bss sections into a new executable. */
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448
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98 int
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99 unexec (char *out_name, char *in_name, uintptr_t start_data,
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100 uintptr_t d1, uintptr_t d2)
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428
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101 {
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102 /* ugly nt hack - should be in lisp */
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103 int a_new, a_out = -1;
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104 char new_name[MAX_PATH], a_name[MAX_PATH];
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105 char *ptr;
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106
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107 /* Make sure that the input and output filenames have the
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108 ".exe" extension...patch them up if they don't. */
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109 strcpy (a_name, in_name);
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110 ptr = a_name + strlen (a_name) - 4;
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111 if (strcmp (ptr, ".exe"))
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112 strcat (a_name, ".exe");
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113
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114 strcpy (new_name, out_name);
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115 ptr = new_name + strlen (new_name) - 4;
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116 if (strcmp (ptr, ".exe"))
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117 strcat (new_name, ".exe");
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118
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119 /* We need to round off our heap to NT's allocation unit (64KB). */
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120 /* round_heap (get_allocation_unit ()); */
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121
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122 if (a_name && (a_out = open (a_name, O_RDONLY | OPEN_BINARY)) < 0)
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123 {
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124 PERROR (a_name);
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125 }
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126
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127 if ((a_new = open (new_name, O_WRONLY | O_TRUNC | O_CREAT | OPEN_BINARY,
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446
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128 0755)) < 0)
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428
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129 {
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130 PERROR (new_name);
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131 }
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132
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133 /* Get the interesting section info, like start and size of .bss... */
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134 get_section_info (a_out, a_name);
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135
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136 copy_executable_and_dump_data_section (a_out, a_new);
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137
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138 close(a_out);
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139 close(a_new);
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448
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140 return 0;
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428
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141 }
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142
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143 /* Flip through the executable and cache the info necessary for dumping. */
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144 static void get_section_info (int a_out, char* a_name)
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145 {
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448
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146 extern char my_ebss[];
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428
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147 /* From lastfile.c */
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148 extern char my_edata[];
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149
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150 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
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151 {
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152 PERROR (a_name);
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153 }
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154
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155 if (f_hdr.e_magic != DOSMAGIC)
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156 {
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157 PERROR("unknown exe header");
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158 }
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159
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160 /* Check the NT header signature ... */
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161 if (f_hdr.nt_signature != NT_SIGNATURE)
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162 {
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163 PERROR("invalid nt header");
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164 }
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165
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166 /* Flip through the sections for .data and .bss ... */
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167 if (f_hdr.f_opthdr > 0)
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168 {
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169 if (read (a_out, &f_ohdr, AOUTSZ) != AOUTSZ)
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170 {
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171 PERROR (a_name);
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172 }
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173 }
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174 /* Loop through .data & .bss section headers, copying them in.
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175 With newer lds these are reversed so we have to cope with both */
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176 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
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177
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178 if (read (a_out, &f_text, sizeof (f_text)) != sizeof (f_text)
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179 ||
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180 strcmp (f_text.s_name, ".text"))
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181 {
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182 PERROR ("no .text section");
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183 }
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184
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185 /* The .bss section. */
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186 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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187 ||
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188 (strcmp (f_bss.s_name, ".bss") && strcmp (f_bss.s_name, ".data")))
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189 {
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190 PERROR ("no .bss / .data section");
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191 }
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192
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193 /* check for reversed .bss and .data */
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194 if (!strcmp(f_bss.s_name, ".data"))
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195 {
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196 printf(".data and .bss reversed\n");
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197 sections_reversed = 1;
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198 memcpy(&f_data, &f_bss, sizeof(f_bss));
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199 }
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200
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201 /* The .data section. */
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202 if (!sections_reversed)
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203 {
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204 if (read (a_out, &f_data, sizeof (f_data)) != sizeof (f_data)
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205 ||
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206 strcmp (f_data.s_name, ".data"))
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207 {
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208 PERROR ("no .data section");
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209 }
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210 }
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211 else
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212 {
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213 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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214 ||
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215 strcmp (f_bss.s_name, ".bss"))
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216 {
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217 PERROR ("no .bss section");
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218 }
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219 }
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220
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221 bss_start = (void *) ((char*)f_ohdr.ImageBase + f_bss.s_vaddr);
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222 bss_size = (unsigned long)((char*)&my_ebss-(char*)bss_start);
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223
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224 /* must keep bss data that we want to be blank as blank */
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225 printf("found bss - keeping %lx of %lx bytes\n", bss_size, f_ohdr.bsize);
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226
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227 /* The .data section. */
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228 data_start_va = (void *) ((char*)f_ohdr.ImageBase + f_data.s_vaddr);
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229
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230 /* We want to only write Emacs data back to the executable,
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231 not any of the library data (if library data is included,
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232 then a dumped Emacs won't run on system versions other
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233 than the one Emacs was dumped on). */
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234 data_size = (unsigned long)my_edata - (unsigned long)data_start_va;
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235 printf("found data - keeping %lx of %lx bytes\n", data_size, f_ohdr.dsize);
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236
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237 /* The following data section - often .idata */
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238 if (read (a_out, &f_nextdata, sizeof (f_nextdata)) != sizeof (f_nextdata)
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239 &&
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240 strcmp (&f_nextdata.s_name[2], "data"))
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241 {
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242 PERROR ("no other data section");
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243 }
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244 }
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245
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246 /* The dump routines. */
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247
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248 static void
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249 copy_executable_and_dump_data_section (int a_out, int a_new)
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250 {
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251 long size=0;
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252 unsigned long new_data_size, new_bss_size,
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253 bss_padding, file_sz_change, data_padding=0,
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254 f_data_s_vaddr = f_data.s_vaddr,
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255 f_data_s_scnptr = f_data.s_scnptr,
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256 f_bss_s_vaddr = f_bss.s_vaddr,
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257 f_nextdata_s_scnptr = f_nextdata.s_scnptr;
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258
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259 int i;
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260 void* empty_space;
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261 extern int static_heap_dumped;
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262 SCNHDR section;
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444
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263 /* calculate new sizes:
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264
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265 f_ohdr.dsize is the total initialized data size on disk which is
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266 f_data.s_size + f_idata.s_size.
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267
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268 f_ohdr.data_start is the base addres of all data and so should
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269 not be changed.
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270
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271 *.s_vaddr is the virtual address of the start of the section
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272 *normalized from f_ohdr.ImageBase.
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273
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274 *.s_paddr appears to be the number of bytes in the section
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275 *actually used (whereas *.s_size is aligned).
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428
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276
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277 bsize is now 0 since subsumed into .data
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278 dsize is dsize + (f_data.s_vaddr - f_bss.s_vaddr)
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279 f_data.s_vaddr is f_bss.s_vaddr
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280 f_data.s_size is new dsize maybe.
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281 what about s_paddr & s_scnptr? */
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282
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283 /* this is the amount the file increases in size */
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284 if (!sections_reversed)
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285 {
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286 new_bss_size = f_data.s_vaddr - f_bss.s_vaddr;
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287 data_padding = 0;
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288 }
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289 else
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290 {
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291 new_bss_size = f_nextdata.s_vaddr - f_bss.s_vaddr;
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292 data_padding = (f_bss.s_vaddr - f_data.s_vaddr) - f_data.s_size;
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293 }
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294
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448
|
295 if ((new_bss_size - bss_size) < BSS_PAD_SIZE)
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|
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296 {
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297 PERROR (".bss free space too small");
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298 }
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299
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444
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300 file_sz_change=(new_bss_size + data_padding) - BSS_PAD_SIZE;
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428
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301 new_data_size=f_ohdr.dsize + file_sz_change;
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302
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303 if (!sections_reversed)
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304 {
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305 f_data.s_vaddr = f_bss.s_vaddr;
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306 }
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307 f_data.s_paddr += file_sz_change;
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308 #if 0
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309 if (f_data.s_size + f_nextdata.s_size != f_ohdr.dsize)
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310 {
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311 printf("section size doesn't tally with dsize %lx != %lx\n",
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312 f_data.s_size + f_nextdata.s_size, f_ohdr.dsize);
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313 }
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314 #endif
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315 f_data.s_size += file_sz_change;
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316 lseek (a_new, 0, SEEK_SET);
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|
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317 /* write file header */
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|
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318 f_hdr.f_symptr += file_sz_change;
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448
|
319 #ifdef NO_DEBUG
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|
446
|
320 f_hdr.f_nscns--;
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|
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321 #endif
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444
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322
|
|
428
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323 printf("writing file header\n");
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|
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324 if (write(a_new, &f_hdr, sizeof(f_hdr)) != sizeof(f_hdr))
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|
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325 {
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326 PERROR("failed to write file header");
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327 }
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|
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328 /* write optional header fixing dsize & bsize*/
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|
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329 printf("writing optional header\n");
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330 printf("new data size is %lx, >= %lx\n", new_data_size,
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|
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331 f_ohdr.dsize + f_ohdr.bsize);
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332 if (new_data_size < f_ohdr.dsize + f_ohdr.bsize )
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|
|
333 {
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|
462
|
334 printf("warning: new data size is < approx\n");
|
|
428
|
335 }
|
|
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336 f_ohdr.dsize=new_data_size;
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|
444
|
337 f_ohdr.bsize=BSS_PAD_SIZE;
|
|
428
|
338 if (write(a_new, &f_ohdr, sizeof(f_ohdr)) != sizeof(f_ohdr))
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|
|
339 {
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|
340 PERROR("failed to write optional header");
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|
|
341 }
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|
|
342 /* write text as is */
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|
|
343 printf("writing text header (unchanged)\n");
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344
|
|
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345 if (write(a_new, &f_text, sizeof(f_text)) != sizeof(f_text))
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|
|
346 {
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|
|
347 PERROR("failed to write text header");
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|
|
348 }
|
|
448
|
349 #ifndef NO_DEBUG
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|
444
|
350 /* Write small bss section. */
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|
|
351 if (!sections_reversed)
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|
|
352 {
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|
|
353 f_bss.s_size = BSS_PAD_SIZE;
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|
354 f_bss.s_paddr = BSS_PAD_SIZE;
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|
|
355 f_bss.s_vaddr = f_data.s_vaddr - BSS_PAD_SIZE;
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|
|
356 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
|
|
|
357 {
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|
|
358 PERROR("failed to write bss header");
|
|
|
359 }
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|
|
360 }
|
|
446
|
361 #endif
|
|
428
|
362 /* write new data header */
|
|
|
363 printf("writing .data header\n");
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|
|
364
|
|
|
365 if (write(a_new, &f_data, sizeof(f_data)) != sizeof(f_data))
|
|
|
366 {
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|
|
367 PERROR("failed to write data header");
|
|
|
368 }
|
|
448
|
369 #ifndef NO_DEBUG
|
|
444
|
370 /* Write small bss section. */
|
|
|
371 if (sections_reversed)
|
|
|
372 {
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|
|
373 f_bss.s_size = BSS_PAD_SIZE;
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|
|
374 f_bss.s_paddr = BSS_PAD_SIZE;
|
|
|
375 f_bss.s_vaddr = f_nextdata.s_vaddr - BSS_PAD_SIZE;
|
|
|
376 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
|
|
|
377 {
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|
|
378 PERROR("failed to write bss header");
|
|
|
379 }
|
|
|
380 }
|
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446
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381 #endif
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428
|
382 printf("writing following data header\n");
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383 f_nextdata.s_scnptr += file_sz_change;
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384 if (f_nextdata.s_lnnoptr != 0) f_nextdata.s_lnnoptr += file_sz_change;
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385 if (f_nextdata.s_relptr != 0) f_nextdata.s_relptr += file_sz_change;
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386 if (write(a_new, &f_nextdata, sizeof(f_nextdata)) != sizeof(f_nextdata))
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387 {
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388 PERROR("failed to write nextdata header");
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389 }
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390
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391 /* copy other section headers adjusting the file offset */
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392 for (i=0; i<(f_hdr.f_nscns-3); i++)
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393 {
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394 if (read (a_out, §ion, sizeof (section)) != sizeof (section))
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395 {
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396 PERROR ("no .data section");
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397 }
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398
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399 section.s_scnptr += file_sz_change;
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400 if (section.s_lnnoptr != 0) section.s_lnnoptr += file_sz_change;
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401 if (section.s_relptr != 0) section.s_relptr += file_sz_change;
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402
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403 if (write(a_new, §ion, sizeof(section)) != sizeof(section))
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404 {
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405 PERROR("failed to write data header");
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|
406 }
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|
407 }
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448
|
408 #ifdef NO_DEBUG
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446
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409 /* dump bss to maintain offsets */
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410 memset(&f_bss, 0, sizeof(f_bss));
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|
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411 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
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|
|
412 {
|
|
|
413 PERROR("failed to write bss header");
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|
|
414 }
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|
|
415 #endif
|
|
428
|
416 size=lseek(a_new, 0, SEEK_CUR);
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|
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417 CHECK_AOUT_POS(size);
|
|
|
418
|
|
|
419 /* copy eveything else until start of data */
|
|
|
420 size = f_data_s_scnptr - lseek (a_out, 0, SEEK_CUR);
|
|
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421
|
|
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422 printf ("copying executable up to data section ... %lx bytes\n",
|
|
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423 size);
|
|
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424 dup_file_area(a_out, a_new, size);
|
|
|
425
|
|
|
426 CHECK_AOUT_POS(f_data_s_scnptr);
|
|
|
427
|
|
|
428 if (!sections_reversed)
|
|
|
429 {
|
|
444
|
430 /* dump bss + padding between sections, sans small bss pad */
|
|
428
|
431 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
|
|
|
432 if (write(a_new, bss_start, bss_size) != (int)bss_size)
|
|
|
433 {
|
|
|
434 PERROR("failed to write bss section");
|
|
|
435 }
|
|
|
436
|
|
|
437 /* pad, needs to be zero */
|
|
444
|
438 bss_padding = (new_bss_size - bss_size) - BSS_PAD_SIZE;
|
|
|
439 if (bss_padding < 0)
|
|
|
440 {
|
|
|
441 PERROR("padded .bss too small");
|
|
|
442 }
|
|
428
|
443 printf ("padding .bss ... %lx bytes\n", bss_padding);
|
|
|
444 empty_space = malloc(bss_padding);
|
|
|
445 memset(empty_space, 0, bss_padding);
|
|
|
446 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
|
|
|
447 {
|
|
|
448 PERROR("failed to write bss section");
|
|
|
449 }
|
|
|
450 free(empty_space);
|
|
|
451 }
|
|
|
452
|
|
|
453 /* tell dumped version not to free pure heap */
|
|
|
454 static_heap_dumped = 1;
|
|
|
455 /* Get a pointer to the raw data in our address space. */
|
|
|
456 printf ("dumping .data section... %lx bytes\n", data_size);
|
|
|
457 if (write(a_new, data_start_va, data_size) != (int)data_size)
|
|
|
458 {
|
|
|
459 PERROR("failed to write data section");
|
|
|
460 }
|
|
|
461 /* were going to use free again ... */
|
|
|
462 static_heap_dumped = 0;
|
|
|
463
|
|
|
464 size = lseek(a_out, f_data_s_scnptr + data_size, SEEK_SET);
|
|
|
465
|
|
|
466 if (!sections_reversed)
|
|
|
467 {
|
|
|
468 size = f_nextdata_s_scnptr - size;
|
|
|
469 dup_file_area(a_out, a_new, size);
|
|
|
470 }
|
|
|
471 else
|
|
|
472 {
|
|
444
|
473 /* need to pad to bss with data in file */
|
|
428
|
474 printf ("padding .data ... %lx bytes\n", data_padding);
|
|
|
475 size = (f_bss_s_vaddr - f_data_s_vaddr) - data_size;
|
|
|
476 dup_file_area(a_out, a_new, size);
|
|
|
477
|
|
|
478 /* dump bss + padding between sections */
|
|
|
479 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
|
|
|
480 if (write(a_new, bss_start, bss_size) != (int)bss_size)
|
|
|
481 {
|
|
|
482 PERROR("failed to write bss section");
|
|
|
483 }
|
|
|
484
|
|
|
485 /* pad, needs to be zero */
|
|
444
|
486 bss_padding = (new_bss_size - bss_size) - BSS_PAD_SIZE;
|
|
|
487 if (bss_padding < 0)
|
|
|
488 {
|
|
|
489 PERROR("padded .bss too small");
|
|
|
490 }
|
|
428
|
491 printf ("padding .bss ... %lx bytes\n", bss_padding);
|
|
|
492 empty_space = malloc(bss_padding);
|
|
|
493 memset(empty_space, 0, bss_padding);
|
|
|
494 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
|
|
|
495 {
|
|
|
496 PERROR("failed to write bss section");
|
|
|
497 }
|
|
|
498 free(empty_space);
|
|
|
499 if (lseek(a_new, 0, SEEK_CUR) != f_nextdata.s_scnptr)
|
|
|
500 {
|
|
|
501 printf("at %lx should be at %lx\n",
|
|
|
502 lseek(a_new, 0, SEEK_CUR),
|
|
|
503 f_nextdata.s_scnptr);
|
|
|
504 PERROR("file positioning error\n");
|
|
|
505 }
|
|
|
506 lseek(a_out, f_nextdata_s_scnptr, SEEK_SET);
|
|
|
507 }
|
|
|
508
|
|
|
509 CHECK_AOUT_POS(f_nextdata_s_scnptr);
|
|
|
510
|
|
|
511 /* now dump - nextdata don't need to do this cygwin ds is in .data! */
|
|
|
512 printf ("dumping following data section... %lx bytes\n", f_nextdata.s_size);
|
|
|
513
|
|
|
514 dup_file_area(a_out,a_new,f_nextdata.s_size);
|
|
|
515
|
|
|
516 /* write rest of file */
|
|
|
517 printf ("writing rest of file\n");
|
|
|
518 size = lseek(a_out, 0, SEEK_END);
|
|
|
519 size = size - (f_nextdata_s_scnptr + f_nextdata.s_size); /* length remaining in a_out */
|
|
|
520 lseek(a_out, f_nextdata_s_scnptr + f_nextdata.s_size, SEEK_SET);
|
|
|
521
|
|
|
522 dup_file_area(a_out, a_new, size);
|
|
|
523 }
|
|
|
524
|
|
|
525 /*
|
|
|
526 * copy from aout to anew
|
|
|
527 */
|
|
|
528 static void dup_file_area(int a_out, int a_new, long size)
|
|
|
529 {
|
|
|
530 char page[BUFSIZ];
|
|
|
531 long n;
|
|
|
532 for (; size > 0; size -= sizeof (page))
|
|
|
533 {
|
|
|
534 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
535 if (read (a_out, page, n) != n || write (a_new, page, n) != n)
|
|
|
536 {
|
|
|
537 PERROR ("dump_out()");
|
|
|
538 }
|
|
|
539 }
|
|
|
540 }
|
|
|
541
|
|
|
542 #if 0
|
|
|
543 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval)
|
|
|
544 {
|
|
|
545 int cpos;
|
|
|
546
|
|
|
547 cpos = lseek(a_new, 0, SEEK_CUR);
|
|
|
548 if (va < bss_start || va > bss_start + f_data.s_size)
|
|
|
549 {
|
|
|
550 PERROR("address not in data space\n");
|
|
|
551 }
|
|
|
552 lseek(a_new, f_data.s_scnptr + ((unsigned long)va -
|
|
|
553 (unsigned long)bss_start), SEEK_SET);
|
|
|
554 if (write(a_new, newval, sizeof(int)) != (int)sizeof(int))
|
|
|
555 {
|
|
|
556 PERROR("failed to write int value");
|
|
|
557 }
|
|
|
558 lseek(a_new, cpos, SEEK_SET);
|
|
|
559 }
|
|
|
560 #endif
|
|
|
561
|
|
|
562 #endif /* HAVE_A_OUT_H */
|
