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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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442
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29 #define DONT_ENCAPSULATE /* filenames are external in unex*.c */
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428
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30 #include "sysfile.h"
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442
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31
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546
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32 #define PERROR(arg) \
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33 do { \
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34 perror (arg); \
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35 exit (-1); \
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36 } while (0)
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428
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37
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546
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38 #if !defined (HAVE_A_OUT_H) && !defined (WIN32_NATIVE)
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428
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39 unexec (char *, char *, void *, void *, void *)
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40 {
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41 PERROR("cannot unexec() a.out.h not installed");
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42 }
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43 #else
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44
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546
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45 #ifdef MINGW
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46 #include <../../include/a.out.h>
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47 #else
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428
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48 #include <a.out.h>
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546
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49 #endif
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428
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50
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51 #define ALLOC_UNIT 0xFFFF
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52 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
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53 #define ALIGN_ALLOC(addr) \
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54 ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
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444
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55 /* Note that all sections must be aligned on a 0x1000 boundary so
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56 this is the minimum size that our dummy bss can be. */
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448
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57 #ifndef NO_DEBUG
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444
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58 #define BSS_PAD_SIZE 0x1000
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446
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59 #else
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60 #define BSS_PAD_SIZE 0
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61 #endif
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428
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62
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63 /* To prevent zero-initialized variables from being placed into the bss
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64 section, use non-zero values to represent an uninitialized state. */
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65 #define UNINIT_PTR ((void *) 0xF0A0F0A0)
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66 #define UNINIT_LONG (0xF0A0F0A0L)
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67
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68 static void get_section_info (int a_out, char* a_name);
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69 static void copy_executable_and_dump_data_section (int a_out, int a_new);
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70 static void dup_file_area(int a_out, int a_new, long size);
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71 #if 0
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72 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval);
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73 #endif
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74
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75 /* Cached info about the .data section in the executable. */
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76 void* data_start_va = UNINIT_PTR;
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77 unsigned long data_size = UNINIT_LONG;
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78
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79 /* Cached info about the .bss section in the executable. */
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80 void* bss_start = UNINIT_PTR;
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81 unsigned long bss_size = UNINIT_LONG;
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82 int sections_reversed = 0;
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83 FILHDR f_hdr;
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84 PEAOUTHDR f_ohdr;
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85 SCNHDR f_data, f_bss, f_text, f_nextdata;
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86
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558
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87 #define CHECK_AOUT_POS(a) \
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88 if (lseek(a_out, 0, SEEK_CUR) != a) \
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89 { \
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90 printf("we are at %lx, should be at %lx\n", \
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91 lseek(a_out, 0, SEEK_CUR), a); \
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92 exit(-1); \
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428
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93 }
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94
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95 /* Dump out .data and .bss sections into a new executable. */
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448
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96 int
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97 unexec (char *out_name, char *in_name, uintptr_t start_data,
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98 uintptr_t d1, uintptr_t d2)
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428
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99 {
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100 /* ugly nt hack - should be in lisp */
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101 int a_new, a_out = -1;
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558
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102 char new_name[PATH_MAX], a_name[PATH_MAX];
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428
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103 char *ptr;
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104
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105 /* Make sure that the input and output filenames have the
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106 ".exe" extension...patch them up if they don't. */
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107 strcpy (a_name, in_name);
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108 ptr = a_name + strlen (a_name) - 4;
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109 if (strcmp (ptr, ".exe"))
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110 strcat (a_name, ".exe");
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111
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112 strcpy (new_name, out_name);
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113 ptr = new_name + strlen (new_name) - 4;
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114 if (strcmp (ptr, ".exe"))
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115 strcat (new_name, ".exe");
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116
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117 /* We need to round off our heap to NT's allocation unit (64KB). */
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118 /* round_heap (get_allocation_unit ()); */
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119
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120 if (a_name && (a_out = open (a_name, O_RDONLY | OPEN_BINARY)) < 0)
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558
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121 PERROR (a_name);
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428
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122
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123 if ((a_new = open (new_name, O_WRONLY | O_TRUNC | O_CREAT | OPEN_BINARY,
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446
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124 0755)) < 0)
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558
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125 PERROR (new_name);
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428
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126
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127 /* Get the interesting section info, like start and size of .bss... */
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128 get_section_info (a_out, a_name);
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129
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130 copy_executable_and_dump_data_section (a_out, a_new);
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131
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132 close(a_out);
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133 close(a_new);
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448
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134 return 0;
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428
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135 }
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136
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137 /* Flip through the executable and cache the info necessary for dumping. */
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558
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138 static void
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139 get_section_info (int a_out, char* a_name)
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428
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140 {
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448
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141 extern char my_ebss[];
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428
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142 /* From lastfile.c */
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143 extern char my_edata[];
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144
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145 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
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558
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146 PERROR (a_name);
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428
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147
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148 if (f_hdr.e_magic != DOSMAGIC)
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558
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149 PERROR("unknown exe header");
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428
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150
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151 /* Check the NT header signature ... */
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152 if (f_hdr.nt_signature != NT_SIGNATURE)
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558
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153 PERROR("invalid nt header");
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428
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154
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155 /* Flip through the sections for .data and .bss ... */
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156 if (f_hdr.f_opthdr > 0)
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157 {
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158 if (read (a_out, &f_ohdr, AOUTSZ) != AOUTSZ)
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558
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159 PERROR (a_name);
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428
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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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558
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166 || strcmp (f_text.s_name, ".text"))
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167 PERROR ("no .text section");
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428
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168
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169 /* The .bss section. */
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170 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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558
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171 || (strcmp (f_bss.s_name, ".bss") && strcmp (f_bss.s_name, ".data")))
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172 PERROR ("no .bss / .data section");
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428
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173
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174 /* check for reversed .bss and .data */
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175 if (!strcmp(f_bss.s_name, ".data"))
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176 {
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177 printf(".data and .bss reversed\n");
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178 sections_reversed = 1;
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179 memcpy(&f_data, &f_bss, sizeof(f_bss));
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180 }
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181
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182 /* The .data section. */
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183 if (!sections_reversed)
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184 {
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185 if (read (a_out, &f_data, sizeof (f_data)) != sizeof (f_data)
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558
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186 || strcmp (f_data.s_name, ".data"))
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187 PERROR ("no .data section");
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428
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188 }
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189 else
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190 {
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191 if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
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558
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192 || strcmp (f_bss.s_name, ".bss"))
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193 PERROR ("no .bss section");
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428
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194 }
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195
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196 bss_start = (void *) ((char*)f_ohdr.ImageBase + f_bss.s_vaddr);
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197 bss_size = (unsigned long)((char*)&my_ebss-(char*)bss_start);
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198
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199 /* must keep bss data that we want to be blank as blank */
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200 printf("found bss - keeping %lx of %lx bytes\n", bss_size, f_ohdr.bsize);
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201
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202 /* The .data section. */
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203 data_start_va = (void *) ((char*)f_ohdr.ImageBase + f_data.s_vaddr);
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204
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205 /* We want to only write Emacs data back to the executable,
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206 not any of the library data (if library data is included,
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207 then a dumped Emacs won't run on system versions other
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208 than the one Emacs was dumped on). */
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209 data_size = (unsigned long)my_edata - (unsigned long)data_start_va;
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210 printf("found data - keeping %lx of %lx bytes\n", data_size, f_ohdr.dsize);
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211
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212 /* The following data section - often .idata */
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213 if (read (a_out, &f_nextdata, sizeof (f_nextdata)) != sizeof (f_nextdata)
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214 &&
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215 strcmp (&f_nextdata.s_name[2], "data"))
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558
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216 PERROR ("no other data section");
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428
|
217 }
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218
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|
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219 /* The dump routines. */
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220
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221 static void
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222 copy_executable_and_dump_data_section (int a_out, int a_new)
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223 {
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224 long size=0;
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225 unsigned long new_data_size, new_bss_size,
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558
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226 bss_padding, file_sz_change, data_padding=0,
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227 f_data_s_vaddr = f_data.s_vaddr,
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228 f_data_s_scnptr = f_data.s_scnptr,
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229 f_bss_s_vaddr = f_bss.s_vaddr,
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230 f_nextdata_s_scnptr = f_nextdata.s_scnptr;
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428
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231
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232 int i;
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233 void* empty_space;
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234 extern int static_heap_dumped;
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235 SCNHDR section;
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444
|
236 /* calculate new sizes:
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558
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237
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444
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238 f_ohdr.dsize is the total initialized data size on disk which is
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239 f_data.s_size + f_idata.s_size.
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558
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240
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444
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241 f_ohdr.data_start is the base addres of all data and so should
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242 not be changed.
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243
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244 *.s_vaddr is the virtual address of the start of the section
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245 *normalized from f_ohdr.ImageBase.
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558
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246
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444
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247 *.s_paddr appears to be the number of bytes in the section
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248 *actually used (whereas *.s_size is aligned).
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558
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249
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428
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250 bsize is now 0 since subsumed into .data
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251 dsize is dsize + (f_data.s_vaddr - f_bss.s_vaddr)
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252 f_data.s_vaddr is f_bss.s_vaddr
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253 f_data.s_size is new dsize maybe.
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254 what about s_paddr & s_scnptr? */
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255
|
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256 /* this is the amount the file increases in size */
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257 if (!sections_reversed)
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258 {
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259 new_bss_size = f_data.s_vaddr - f_bss.s_vaddr;
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260 data_padding = 0;
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261 }
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262 else
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263 {
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264 new_bss_size = f_nextdata.s_vaddr - f_bss.s_vaddr;
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265 data_padding = (f_bss.s_vaddr - f_data.s_vaddr) - f_data.s_size;
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266 }
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267
|
|
448
|
268 if ((new_bss_size - bss_size) < BSS_PAD_SIZE)
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|
558
|
269 PERROR (".bss free space too small");
|
|
448
|
270
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|
444
|
271 file_sz_change=(new_bss_size + data_padding) - BSS_PAD_SIZE;
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428
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272 new_data_size=f_ohdr.dsize + file_sz_change;
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273
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|
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274 if (!sections_reversed)
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|
558
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275 f_data.s_vaddr = f_bss.s_vaddr;
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428
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276 f_data.s_paddr += file_sz_change;
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277 #if 0
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278 if (f_data.s_size + f_nextdata.s_size != f_ohdr.dsize)
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558
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279 printf("section size doesn't tally with dsize %lx != %lx\n",
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280 f_data.s_size + f_nextdata.s_size, f_ohdr.dsize);
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428
|
281 #endif
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|
282 f_data.s_size += file_sz_change;
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283 lseek (a_new, 0, SEEK_SET);
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|
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284 /* write file header */
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|
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285 f_hdr.f_symptr += file_sz_change;
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448
|
286 #ifdef NO_DEBUG
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|
446
|
287 f_hdr.f_nscns--;
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|
|
288 #endif
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|
444
|
289
|
|
428
|
290 printf("writing file header\n");
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291 if (write(a_new, &f_hdr, sizeof(f_hdr)) != sizeof(f_hdr))
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|
558
|
292 PERROR("failed to write file header");
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|
428
|
293 /* write optional header fixing dsize & bsize*/
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|
|
294 printf("writing optional header\n");
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295 printf("new data size is %lx, >= %lx\n", new_data_size,
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|
|
296 f_ohdr.dsize + f_ohdr.bsize);
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|
|
297 if (new_data_size < f_ohdr.dsize + f_ohdr.bsize )
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|
558
|
298 printf("warning: new data size is < approx\n");
|
|
428
|
299 f_ohdr.dsize=new_data_size;
|
|
444
|
300 f_ohdr.bsize=BSS_PAD_SIZE;
|
|
428
|
301 if (write(a_new, &f_ohdr, sizeof(f_ohdr)) != sizeof(f_ohdr))
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|
558
|
302 PERROR("failed to write optional header");
|
|
428
|
303 /* write text as is */
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|
|
304 printf("writing text header (unchanged)\n");
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|
|
305
|
|
|
306 if (write(a_new, &f_text, sizeof(f_text)) != sizeof(f_text))
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|
558
|
307 PERROR("failed to write text header");
|
|
448
|
308 #ifndef NO_DEBUG
|
|
444
|
309 /* Write small bss section. */
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|
|
310 if (!sections_reversed)
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|
|
311 {
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|
|
312 f_bss.s_size = BSS_PAD_SIZE;
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|
|
313 f_bss.s_paddr = BSS_PAD_SIZE;
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|
|
314 f_bss.s_vaddr = f_data.s_vaddr - BSS_PAD_SIZE;
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|
|
315 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
|
|
558
|
316 PERROR("failed to write bss header");
|
|
444
|
317 }
|
|
446
|
318 #endif
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|
428
|
319 /* write new data header */
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|
|
320 printf("writing .data header\n");
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|
|
321
|
|
|
322 if (write(a_new, &f_data, sizeof(f_data)) != sizeof(f_data))
|
|
558
|
323 PERROR("failed to write data header");
|
|
448
|
324 #ifndef NO_DEBUG
|
|
444
|
325 /* Write small bss section. */
|
|
|
326 if (sections_reversed)
|
|
|
327 {
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|
|
328 f_bss.s_size = BSS_PAD_SIZE;
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|
|
329 f_bss.s_paddr = BSS_PAD_SIZE;
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|
|
330 f_bss.s_vaddr = f_nextdata.s_vaddr - BSS_PAD_SIZE;
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|
|
331 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
|
|
558
|
332 PERROR("failed to write bss header");
|
|
444
|
333 }
|
|
446
|
334 #endif
|
|
428
|
335 printf("writing following data header\n");
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|
|
336 f_nextdata.s_scnptr += file_sz_change;
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|
|
337 if (f_nextdata.s_lnnoptr != 0) f_nextdata.s_lnnoptr += file_sz_change;
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|
|
338 if (f_nextdata.s_relptr != 0) f_nextdata.s_relptr += file_sz_change;
|
|
|
339 if (write(a_new, &f_nextdata, sizeof(f_nextdata)) != sizeof(f_nextdata))
|
|
558
|
340 PERROR("failed to write nextdata header");
|
|
428
|
341
|
|
|
342 /* copy other section headers adjusting the file offset */
|
|
|
343 for (i=0; i<(f_hdr.f_nscns-3); i++)
|
|
|
344 {
|
|
|
345 if (read (a_out, §ion, sizeof (section)) != sizeof (section))
|
|
558
|
346 PERROR ("no .data section");
|
|
428
|
347
|
|
|
348 section.s_scnptr += file_sz_change;
|
|
|
349 if (section.s_lnnoptr != 0) section.s_lnnoptr += file_sz_change;
|
|
|
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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558
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353 PERROR("failed to write data header");
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428
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354 }
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448
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355 #ifdef NO_DEBUG
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446
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356 /* dump bss to maintain offsets */
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357 memset(&f_bss, 0, sizeof(f_bss));
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358 if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
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558
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359 PERROR("failed to write bss header");
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446
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360 #endif
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428
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361 size=lseek(a_new, 0, SEEK_CUR);
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362 CHECK_AOUT_POS(size);
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363
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364 /* copy eveything else until start of data */
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365 size = f_data_s_scnptr - lseek (a_out, 0, SEEK_CUR);
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366
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367 printf ("copying executable up to data section ... %lx bytes\n",
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368 size);
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369 dup_file_area(a_out, a_new, size);
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370
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371 CHECK_AOUT_POS(f_data_s_scnptr);
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372
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373 if (!sections_reversed)
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374 {
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444
|
375 /* dump bss + padding between sections, sans small bss pad */
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428
|
376 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
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377 if (write(a_new, bss_start, bss_size) != (int)bss_size)
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|
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378 {
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|
|
379 PERROR("failed to write bss section");
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|
|
380 }
|
|
|
381
|
|
|
382 /* pad, needs to be zero */
|
|
444
|
383 bss_padding = (new_bss_size - bss_size) - BSS_PAD_SIZE;
|
|
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384 if (bss_padding < 0)
|
|
558
|
385 PERROR("padded .bss too small");
|
|
428
|
386 printf ("padding .bss ... %lx bytes\n", bss_padding);
|
|
|
387 empty_space = malloc(bss_padding);
|
|
|
388 memset(empty_space, 0, bss_padding);
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|
|
389 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
|
|
558
|
390 PERROR("failed to write bss section");
|
|
428
|
391 free(empty_space);
|
|
|
392 }
|
|
|
393
|
|
|
394 /* tell dumped version not to free pure heap */
|
|
|
395 static_heap_dumped = 1;
|
|
|
396 /* Get a pointer to the raw data in our address space. */
|
|
|
397 printf ("dumping .data section... %lx bytes\n", data_size);
|
|
|
398 if (write(a_new, data_start_va, data_size) != (int)data_size)
|
|
558
|
399 PERROR("failed to write data section");
|
|
428
|
400 /* were going to use free again ... */
|
|
|
401 static_heap_dumped = 0;
|
|
|
402
|
|
|
403 size = lseek(a_out, f_data_s_scnptr + data_size, SEEK_SET);
|
|
|
404
|
|
|
405 if (!sections_reversed)
|
|
|
406 {
|
|
|
407 size = f_nextdata_s_scnptr - size;
|
|
|
408 dup_file_area(a_out, a_new, size);
|
|
|
409 }
|
|
|
410 else
|
|
|
411 {
|
|
444
|
412 /* need to pad to bss with data in file */
|
|
428
|
413 printf ("padding .data ... %lx bytes\n", data_padding);
|
|
|
414 size = (f_bss_s_vaddr - f_data_s_vaddr) - data_size;
|
|
|
415 dup_file_area(a_out, a_new, size);
|
|
|
416
|
|
|
417 /* dump bss + padding between sections */
|
|
|
418 printf ("dumping .bss into executable... %lx bytes\n", bss_size);
|
|
|
419 if (write(a_new, bss_start, bss_size) != (int)bss_size)
|
|
558
|
420 PERROR("failed to write bss section");
|
|
428
|
421
|
|
|
422 /* pad, needs to be zero */
|
|
444
|
423 bss_padding = (new_bss_size - bss_size) - BSS_PAD_SIZE;
|
|
|
424 if (bss_padding < 0)
|
|
558
|
425 PERROR("padded .bss too small");
|
|
428
|
426 printf ("padding .bss ... %lx bytes\n", bss_padding);
|
|
|
427 empty_space = malloc(bss_padding);
|
|
|
428 memset(empty_space, 0, bss_padding);
|
|
|
429 if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
|
|
558
|
430 PERROR("failed to write bss section");
|
|
428
|
431 free(empty_space);
|
|
|
432 if (lseek(a_new, 0, SEEK_CUR) != f_nextdata.s_scnptr)
|
|
|
433 {
|
|
|
434 printf("at %lx should be at %lx\n",
|
|
|
435 lseek(a_new, 0, SEEK_CUR),
|
|
|
436 f_nextdata.s_scnptr);
|
|
|
437 PERROR("file positioning error\n");
|
|
|
438 }
|
|
|
439 lseek(a_out, f_nextdata_s_scnptr, SEEK_SET);
|
|
|
440 }
|
|
|
441
|
|
|
442 CHECK_AOUT_POS(f_nextdata_s_scnptr);
|
|
|
443
|
|
|
444 /* now dump - nextdata don't need to do this cygwin ds is in .data! */
|
|
|
445 printf ("dumping following data section... %lx bytes\n", f_nextdata.s_size);
|
|
|
446
|
|
|
447 dup_file_area(a_out,a_new,f_nextdata.s_size);
|
|
|
448
|
|
|
449 /* write rest of file */
|
|
|
450 printf ("writing rest of file\n");
|
|
|
451 size = lseek(a_out, 0, SEEK_END);
|
|
|
452 size = size - (f_nextdata_s_scnptr + f_nextdata.s_size); /* length remaining in a_out */
|
|
|
453 lseek(a_out, f_nextdata_s_scnptr + f_nextdata.s_size, SEEK_SET);
|
|
|
454
|
|
|
455 dup_file_area(a_out, a_new, size);
|
|
|
456 }
|
|
|
457
|
|
|
458 /*
|
|
|
459 * copy from aout to anew
|
|
|
460 */
|
|
|
461 static void dup_file_area(int a_out, int a_new, long size)
|
|
|
462 {
|
|
|
463 char page[BUFSIZ];
|
|
|
464 long n;
|
|
|
465 for (; size > 0; size -= sizeof (page))
|
|
|
466 {
|
|
|
467 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
468 if (read (a_out, page, n) != n || write (a_new, page, n) != n)
|
|
558
|
469 PERROR ("dump_out()");
|
|
428
|
470 }
|
|
|
471 }
|
|
|
472
|
|
|
473 #if 0
|
|
|
474 static void write_int_to_bss(int a_out, int a_new, void* va, void* newval)
|
|
|
475 {
|
|
|
476 int cpos;
|
|
|
477
|
|
|
478 cpos = lseek(a_new, 0, SEEK_CUR);
|
|
|
479 if (va < bss_start || va > bss_start + f_data.s_size)
|
|
558
|
480 PERROR("address not in data space\n");
|
|
428
|
481 lseek(a_new, f_data.s_scnptr + ((unsigned long)va -
|
|
|
482 (unsigned long)bss_start), SEEK_SET);
|
|
|
483 if (write(a_new, newval, sizeof(int)) != (int)sizeof(int))
|
|
558
|
484 PERROR("failed to write int value");
|
|
428
|
485 lseek(a_new, cpos, SEEK_SET);
|
|
|
486 }
|
|
|
487 #endif
|
|
|
488
|
|
|
489 #endif /* HAVE_A_OUT_H */
|
