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428
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1 /* Unexec for DEC alpha. schoepf@sc.ZIB-Berlin.DE (Rainer Schoepf).
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2
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3 Copyright (C) 1994 Free Software Foundation, Inc.
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4
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5 This file is part of GNU Emacs.
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6
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7 GNU Emacs is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2, or (at your option)
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10 any later version.
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11
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12 GNU Emacs is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GNU Emacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.31. */
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23
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24
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25 #include <config.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #include <unistd.h>
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29 #include <sys/types.h>
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30 #include <sys/file.h>
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31 #include <sys/stat.h>
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32 #include <sys/mman.h>
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33 #include <stdio.h>
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438
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34 #include <errno.h>
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428
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35 #include <varargs.h>
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36 #include <filehdr.h>
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37 #include <aouthdr.h>
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38 #include <scnhdr.h>
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39 #include <syms.h>
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40
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41 static void fatal_unexec (char *, char *);
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42 static void mark_x (char *);
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43
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44 #define READ(_fd, _buffer, _size, _error_message, _error_arg) \
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45 errno = EEOF; \
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46 if (read (_fd, _buffer, _size) != _size) \
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47 fatal_unexec (_error_message, _error_arg);
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48
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49 #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
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50 if (write (_fd, _buffer, _size) != _size) \
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51 fatal_unexec (_error_message, _error_arg);
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52
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53 #define SEEK(_fd, _position, _error_message, _error_arg) \
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54 errno = EEOF; \
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55 if (lseek (_fd, _position, L_SET) != _position) \
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56 fatal_unexec (_error_message, _error_arg);
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57
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58 void *sbrk();
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59
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60 #define EEOF -1
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61
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62 static struct scnhdr *text_section;
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63 static struct scnhdr *init_section;
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64 static struct scnhdr *finit_section;
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65 static struct scnhdr *rdata_section;
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66 static struct scnhdr *rconst_section;
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67 static struct scnhdr *data_section;
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68 static struct scnhdr *pdata_section;
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69 static struct scnhdr *xdata_section;
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70 static struct scnhdr *got_section;
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71 static struct scnhdr *lit8_section;
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72 static struct scnhdr *lit4_section;
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73 static struct scnhdr *sdata_section;
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74 static struct scnhdr *sbss_section;
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75 static struct scnhdr *bss_section;
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76
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77 static unsigned long Brk;
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78
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79 struct headers {
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80 struct filehdr fhdr;
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81 struct aouthdr aout;
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82 struct scnhdr section[_MIPS_NSCNS_MAX];
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83 };
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84
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85
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86
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87 /* Define name of label for entry point for the dumped executable. */
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88
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89 #ifndef DEFAULT_ENTRY_ADDRESS
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90 #define DEFAULT_ENTRY_ADDRESS __start
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91 #endif
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92
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93 int
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94 unexec (char *new_name, char *a_name,
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95 unsigned long data_start,
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96 unsigned long bss_start,
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97 unsigned long entry_address)
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98 {
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99 int new, old;
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100 char * oldptr;
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101 struct headers ohdr, nhdr;
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102 struct stat stat;
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103 long pagesize, brk;
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104 long newsyms, symrel;
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105 int i;
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106 long vaddr, scnptr;
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107 #define BUFSIZE 8192
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108 char buffer[BUFSIZE];
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109
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110 if ((old = open (a_name, O_RDONLY)) < 0)
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111 fatal_unexec ("opening %s", a_name);
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112
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113 new = creat (new_name, 0666);
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114 if (new < 0) fatal_unexec ("creating %s", new_name);
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115
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116 if ((fstat (old, &stat) == -1))
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117 fatal_unexec ("fstat %s", a_name);
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118
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119 oldptr = (char *)mmap (0, stat.st_size, PROT_READ, MAP_FILE|MAP_SHARED, old, 0);
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120
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121 if (oldptr == (char *)-1)
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122 fatal_unexec ("mmap %s", a_name);
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123
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124 close (old);
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125
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126 /* This is a copy of the a.out header of the original executable */
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127
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128 ohdr = (*(struct headers *)oldptr);
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129
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130 /* This is where we build the new header from the in-memory copy */
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131
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132 nhdr = *((struct headers *)TEXT_START);
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133
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134 /* First do some consistency checks */
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135
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136 if (nhdr.fhdr.f_magic != ALPHAMAGIC
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137 && nhdr.fhdr.f_magic != ALPHAUMAGIC)
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138 {
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139 fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n",
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140 nhdr.fhdr.f_magic, ALPHAMAGIC, ALPHAUMAGIC);
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141 exit (1);
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142 }
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143
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144 if (nhdr.fhdr.f_opthdr != sizeof (nhdr.aout))
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145 {
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146 fprintf (stderr, "unexec: input a.out header is %d bytes, not %ld.\n",
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147 nhdr.fhdr.f_opthdr, (long) (sizeof (nhdr.aout)));
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148 exit (1);
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149 }
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150 if (nhdr.aout.magic != ZMAGIC)
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151 {
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152 fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n",
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153 nhdr.aout.magic, ZMAGIC);
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154 exit (1);
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155 }
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156
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157
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158 /* Now check the existence of certain header section and grab
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159 their addresses. */
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160
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161 #define CHECK_SCNHDR(ptr, name, flags) \
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162 ptr = NULL; \
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163 for (i = 0; i < nhdr.fhdr.f_nscns && !ptr; i++) \
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164 if (strcmp (nhdr.section[i].s_name, name) == 0) \
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165 { \
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166 if (nhdr.section[i].s_flags != flags) \
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167 fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \
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168 nhdr.section[i].s_flags, flags, name); \
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169 ptr = nhdr.section + i; \
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170 } \
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171
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172 CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT);
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173 CHECK_SCNHDR (init_section, _INIT, STYP_INIT);
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174 #ifdef _FINI
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175 CHECK_SCNHDR (finit_section, _FINI, STYP_FINI);
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176 #endif /* _FINI */
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177 CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA);
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178 #ifdef _RCONST
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179 CHECK_SCNHDR (rconst_section, _RCONST, STYP_RCONST);
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180 #endif
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181 #ifdef _PDATA
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182 CHECK_SCNHDR (pdata_section, _PDATA, STYP_PDATA);
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183 #endif /* _PDATA */
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184 #ifdef _GOT
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185 CHECK_SCNHDR (got_section, _GOT, STYP_GOT);
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186 #endif /* _GOT */
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187 CHECK_SCNHDR (data_section, _DATA, STYP_DATA);
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188 #ifdef _XDATA
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189 CHECK_SCNHDR (xdata_section, _XDATA, STYP_XDATA);
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190 #endif /* _XDATA */
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191 #ifdef _LIT8
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192 CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8);
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193 CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4);
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194 #endif /* _LIT8 */
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195 CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA);
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196 CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS);
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197 CHECK_SCNHDR (bss_section, _BSS, STYP_BSS);
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198
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199
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200 pagesize = getpagesize ();
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201 brk = (((long) (sbrk (0))) + pagesize - 1) & (-pagesize);
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202
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203 /* Remember the current break */
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204
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205 Brk = brk;
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206
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207 nhdr.aout.dsize = brk - DATA_START;
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208 nhdr.aout.bsize = 0;
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209 if (entry_address == 0)
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210 {
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211 extern int DEFAULT_ENTRY_ADDRESS (void);
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212 nhdr.aout.entry = (unsigned long)DEFAULT_ENTRY_ADDRESS;
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213 }
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214 else
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215 nhdr.aout.entry = entry_address;
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216
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217 nhdr.aout.bss_start = nhdr.aout.data_start + nhdr.aout.dsize;
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218
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219 if (rdata_section != NULL)
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220 {
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221 rdata_section->s_size = data_start - DATA_START;
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222
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223 /* Adjust start and virtual addresses of rdata_section, too. */
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224 rdata_section->s_vaddr = DATA_START;
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225 rdata_section->s_paddr = DATA_START;
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226 rdata_section->s_scnptr = text_section->s_scnptr + nhdr.aout.tsize;
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227 }
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228
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229 data_section->s_vaddr = data_start;
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230 data_section->s_paddr = data_start;
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231 data_section->s_size = brk - data_start;
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232
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233 if (rdata_section != NULL)
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234 {
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235 data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size;
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236 }
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237
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238 vaddr = data_section->s_vaddr + data_section->s_size;
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239 scnptr = data_section->s_scnptr + data_section->s_size;
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240 if (lit8_section != NULL)
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241 {
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242 lit8_section->s_vaddr = vaddr;
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243 lit8_section->s_paddr = vaddr;
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244 lit8_section->s_size = 0;
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245 lit8_section->s_scnptr = scnptr;
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246 }
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247 if (lit4_section != NULL)
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248 {
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249 lit4_section->s_vaddr = vaddr;
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250 lit4_section->s_paddr = vaddr;
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251 lit4_section->s_size = 0;
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252 lit4_section->s_scnptr = scnptr;
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253 }
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254 if (sdata_section != NULL)
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255 {
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256 sdata_section->s_vaddr = vaddr;
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257 sdata_section->s_paddr = vaddr;
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258 sdata_section->s_size = 0;
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259 sdata_section->s_scnptr = scnptr;
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260 }
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261 #ifdef _XDATA
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262 if (xdata_section != NULL)
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263 {
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264 xdata_section->s_vaddr = vaddr;
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265 xdata_section->s_paddr = vaddr;
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266 xdata_section->s_size = 0;
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267 xdata_section->s_scnptr = scnptr;
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268 }
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269 #endif
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270 #ifdef _GOT
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271 if (got_section != NULL)
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272 {
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273 got_section->s_vaddr = vaddr;
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274 got_section->s_paddr = vaddr;
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275 got_section->s_size = 0;
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276 got_section->s_scnptr = scnptr;
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277 }
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278 #endif /*_GOT */
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279 if (sbss_section != NULL)
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280 {
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281 sbss_section->s_vaddr = vaddr;
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282 sbss_section->s_paddr = vaddr;
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283 sbss_section->s_size = 0;
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284 sbss_section->s_scnptr = scnptr;
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285 }
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286 if (bss_section != NULL)
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287 {
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288 bss_section->s_vaddr = vaddr;
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289 bss_section->s_paddr = vaddr;
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290 bss_section->s_size = 0;
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291 bss_section->s_scnptr = scnptr;
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292 }
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293
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294 WRITE (new, (char *)TEXT_START, nhdr.aout.tsize,
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295 "writing text section to %s", new_name);
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296 WRITE (new, (char *)DATA_START, nhdr.aout.dsize,
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297 "writing data section to %s", new_name);
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298
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299
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300 /*
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301 * Construct new symbol table header
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302 */
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303
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304 memcpy (buffer, oldptr + nhdr.fhdr.f_symptr, cbHDRR);
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305
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306 #define symhdr ((pHDRR)buffer)
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307 newsyms = nhdr.aout.tsize + nhdr.aout.dsize;
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308 symrel = newsyms - nhdr.fhdr.f_symptr;
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309 nhdr.fhdr.f_symptr = newsyms;
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310 symhdr->cbLineOffset += symrel;
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311 symhdr->cbDnOffset += symrel;
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312 symhdr->cbPdOffset += symrel;
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313 symhdr->cbSymOffset += symrel;
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314 symhdr->cbOptOffset += symrel;
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315 symhdr->cbAuxOffset += symrel;
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316 symhdr->cbSsOffset += symrel;
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317 symhdr->cbSsExtOffset += symrel;
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318 symhdr->cbFdOffset += symrel;
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319 symhdr->cbRfdOffset += symrel;
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320 symhdr->cbExtOffset += symrel;
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321
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322 WRITE (new, buffer, cbHDRR, "writing symbol table header of %s", new_name);
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323
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324 /*
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325 * Copy the symbol table and line numbers
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326 */
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327 WRITE (new, oldptr + ohdr.fhdr.f_symptr + cbHDRR,
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328 stat.st_size - ohdr.fhdr.f_symptr - cbHDRR,
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329 "writing symbol table of %s", new_name);
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330
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331 #if 0
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332
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333 /* Not needed for now */
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334
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335 update_dynamic_symbols (oldptr, new_name, new, newsyms,
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336 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->issExtMax,
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337 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->cbExtOffset,
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338 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->cbSsExtOffset);
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339
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340 #endif
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341
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342 #undef symhdr
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343
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344 SEEK (new, 0, "seeking to start of header in %s", new_name);
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345 WRITE (new, &nhdr, sizeof (nhdr),
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346 "writing header of %s", new_name);
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347
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348 close (old);
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349 close (new);
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350 mark_x (new_name);
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351 return 0;
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352 }
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353
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354
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355 #if 0
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356
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357 /* Not needed for now */
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358
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359 /* The following function updates the values of some symbols
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360 that are used by the dynamic loader:
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361
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362 _edata
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363 _end
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364
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365 */
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366
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367 int
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368 update_dynamic_symbols (
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369 char *old, /* Pointer to old executable */
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370 char *new_name, /* Name of new executable */
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371 int new, /* File descriptor for new executable */
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372 long newsyms, /* Offset of Symbol table in new executable */
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373 int nsyms, /* Number of symbol table entries */
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374 long symoff, /* Offset of External Symbols in old file */
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375 long stroff) /* Offset of string table in old file */
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376 {
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377 long i;
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378 int found = 0;
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379 EXTR n_end, n_edata;
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380
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381 /* We go through the symbol table entries until we have found the two
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382 symbols. */
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383
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384 /* cbEXTR is the size of an external symbol table entry */
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385
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386 for (i = 0; i < nsyms && found < 2; i += cbEXTR)
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387 {
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388 REGISTER pEXTR x = (pEXTR) (old + symoff + i);
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389 char *s;
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390
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391 s = old + stroff + x->asym.iss; /* name of the symbol */
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392
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393 if (!strcmp(s,"_edata"))
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394 {
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395 found++;
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396 memcpy (&n_edata, x, cbEXTR);
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397 n_edata.asym.value = Brk;
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398 SEEK (new, newsyms + cbHDRR + i,
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399 "seeking to symbol _edata in %s", new_name);
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400 WRITE (new, &n_edata, cbEXTR,
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401 "writing symbol table entry for _edata into %s", new_name);
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402 }
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403 else if (!strcmp(s,"_end"))
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404 {
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405 found++;
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406 memcpy (&n_end, x, cbEXTR);
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407 n_end.asym.value = Brk;
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408 SEEK (new, newsyms + cbHDRR + i,
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409 "seeking to symbol _end in %s", new_name);
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410 WRITE (new, &n_end, cbEXTR,
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411 "writing symbol table entry for _end into %s", new_name);
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412 }
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413 }
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414
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415 }
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416
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417 #endif
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418
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419
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420 /*
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421 * mark_x
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422 *
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423 * After successfully building the new a.out, mark it executable
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424 */
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425
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426 static void
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427 mark_x (char *name)
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428 {
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429 struct stat sbuf;
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430 int um = umask (777);
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431 umask (um);
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432 if (stat (name, &sbuf) < 0)
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433 fatal_unexec ("getting protection on %s", name);
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434 sbuf.st_mode |= 0111 & ~um;
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|
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435 if (chmod (name, sbuf.st_mode) < 0)
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|
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436 fatal_unexec ("setting protection on %s", name);
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|
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437 }
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438
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|
|
439 static void
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|
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440 fatal_unexec (char *s, char *arg)
|
|
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441 {
|
|
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442 if (errno == EEOF)
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|
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443 fputs ("unexec: unexpected end of file, ", stderr);
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|
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444 else
|
|
|
445 fprintf (stderr, "unexec: %s, ", strerror (errno));
|
|
|
446 fprintf (stderr, s, arg);
|
|
|
447 fputs (".\n", stderr);
|
|
|
448 exit (1);
|
|
|
449 }
|
