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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000
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428
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2 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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428
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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
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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428
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10
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613
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11 XEmacs is distributed in the hope that it will be useful, but
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 General Public License for more details.
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444
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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
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18 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA.
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20
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21 In other words, you are welcome to use, share and improve this
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22 program. You are forbidden to forbid anyone else to use, share and
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23 improve what you give them. Help stamp out software-hoarding! */
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24
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25
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26 /*
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27 * unexec.c - Convert a running program into an a.out file.
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28 *
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29 * Author: Spencer W. Thomas
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30 * Computer Science Dept.
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31 * University of Utah
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32 * Date: Tue Mar 2 1982
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33 * Modified heavily since then.
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34 *
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35 * Synopsis:
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446
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36 * void
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37 * unexec (char *new_name,
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38 * char *old_name,
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39 * uintptr_t data_start,
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40 * uintptr_t bss_start,
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41 * uintptr_t entry_address)
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428
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42 *
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446
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43 * The basic idea is that we start with an ELF file which contains
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44 * .bss (uninitialized global data) section which is normally not in
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45 * the file. As we load lisp the variables, which were first set to 0,
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46 * will change their values. We want to save those changed values into
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47 * another ELF file, which will become a new xemacs image. To do this,
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48 * we need to change several structures in the ELF file.
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428
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49 *
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446
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50 * First of all, we need to change the programm header which tells
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51 * the linker how to load stuff into memory so that data will come
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52 * from the file and not from the /dev/zero. To do this, we find the
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53 * segment, which is marked as loadable (type PT_LOAD) and which
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54 * covers the old .bss section. We will next change the filesz and
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55 * memsz for that segment to extend over the new data section.
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428
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56 *
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446
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57 * Next we have to make sure that section header for the stuff which
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58 * used to be uninitialized is changed to be initialized and to come
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59 * from the file. To do this, we change the size and the type of the old
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60 * .bss section (and all other section of the type SHT_NOBITS) to cover the
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61 * new section and to be of type SHT_PROCBITS.
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444
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62 *
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63 * We also insert a new SHT_NOBITS section to keep some tools, which expect
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64 * .bss happy.
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428
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65 *
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446
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66 * Finally we need to patch up some references to the section
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67 * indexes since we change the order and undo the relocation info to
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68 * be the same as it was "before" because we actually used the data
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69 * from the memory which were changed by the run-time linker.
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428
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70 */
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71
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72 #ifndef emacs
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73 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
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74 #include <string.h>
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75 #else
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76 #include <config.h>
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77 extern void fatal (const char *, ...);
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78 #endif
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428
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79
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80 #include <sys/types.h>
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81 #include <stdio.h>
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82 #include <sys/stat.h>
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83 #include <memory.h>
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84 #include <errno.h>
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85 #include <unistd.h>
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86 #include <fcntl.h>
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446
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87 #ifdef HAVE_ELF_H
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428
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88 #include <elf.h>
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444
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89 #endif
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428
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90 #include <sys/mman.h>
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444
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91 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
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92 #include <sys/elf_mips.h>
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93 #include <sym.h>
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94 #endif /* __sony_news && _SYSTYPE_SYSV */
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95 #if __sgi
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96 #include <syms.h> /* for HDRR declaration */
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97 #endif /* __sgi */
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98
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444
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99 #if __GNU_LIBRARY__ - 0 >= 6
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100 # include <link.h> /* get ElfW etc */
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101 #endif
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102
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103 #ifndef ElfW
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104 # ifdef __STDC__
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105 # define ElfBitsW(bits, type) Elf##bits##_##type
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106 # else
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107 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
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108 # endif
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109 # ifdef _LP64
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110 # define ELFSIZE 64
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111 # else
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112 # define ELFSIZE 32
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113 # endif
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114 /* This macro expands `bits' before invoking ElfBitsW. */
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115 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
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116 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
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117 #endif
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118
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119 #ifndef ELF_BSS_SECTION_NAME
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120 #define ELF_BSS_SECTION_NAME ".bss"
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121 #endif
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428
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122
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123 /* Get the address of a particular section or program header entry,
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446
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124 * accounting for the size of the entries. */
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428
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125
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126 #define OLD_SECTION_H(n) \
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127 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
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128 #define NEW_SECTION_H(n) \
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129 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
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130 #define OLD_PROGRAM_H(n) \
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131 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
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428
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132 #define NEW_PROGRAM_H(n) \
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133 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
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428
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134
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135 #define PATCH_INDEX(n) \
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136 do { \
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137 if ((int) (n) >= growme_index) \
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138 (n)++; } while (0)
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446
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139
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428
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140 typedef unsigned char byte;
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141
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142 /* Round X up to a multiple of Y. */
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143
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444
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144 static ElfW(Addr)
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145 round_up (ElfW(Addr) x, ElfW(Addr) y)
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428
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146 {
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147 int rem = x % y;
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148 if (rem == 0)
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149 return x;
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150 return x - rem + y;
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151 }
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152
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153 /* Return the index of the section named NAME.
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154 SECTION_NAMES, FILE_NAME and FILE_H give information
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155 about the file we are looking in.
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156
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157 If we don't find the section NAME, that is a fatal error
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158 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
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159
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160 static int
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161 find_section (char *name,
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446
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162 const char *section_names,
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428
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163 char *file_name,
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444
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164 ElfW(Ehdr) *old_file_h,
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165 ElfW(Shdr) *old_section_h,
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428
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166 int noerror)
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167 {
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168 int idx;
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169
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170 for (idx = 1; idx < old_file_h->e_shnum; idx++)
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171 {
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172 #ifdef DEBUG
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173 fprintf (stderr, "Looking for %s - found %s\n", name,
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174 section_names + OLD_SECTION_H (idx).sh_name);
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175 #endif
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176 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
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177 name))
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446
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178 return idx;
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428
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179 }
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180
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446
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181 /* If we're here, we found nothing or return did not work */
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182 if ( ! noerror)
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183 fatal ("Can't find %s in %s.\n", name, file_name);
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184
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185 return -1;
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428
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186 }
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187
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188 /* ****************************************************************
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189 * unexec
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190 *
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191 * driving logic.
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192 *
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193 * In ELF, this works by replacing the old .bss section with a new
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194 * .data section, and inserting an empty .bss immediately afterwards.
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195 *
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196 */
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444
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197 void
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428
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198 unexec (char *new_name,
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199 char *old_name,
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200 uintptr_t data_start,
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201 uintptr_t bss_start,
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202 uintptr_t entry_address)
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203 {
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446
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204 int old_file;
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428
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205
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446
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206 struct stat stat_buf;
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428
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207 caddr_t old_base, new_base;
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208
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446
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209 ElfW(Ehdr) *old_file_h, * new_file_h;
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210 ElfW(Phdr) *old_program_h, * new_program_h;
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211 ElfW(Shdr) *old_section_h, * new_section_h;
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212 ElfW(Shdr) * growme = NULL, * grown = NULL;
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213 ElfW(Addr) old_bss_addr = 0, new_data2_addr = 0;
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428
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214
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446
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215 int growme_index = -1;
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444
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216 int n, nn;
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446
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217 const char *old_section_names;
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218 int old_mdebug_index, old_data_index;
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219 int new_bss_addr, new_data2_size, new_data2_offset, new_file, new_file_size;
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428
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220
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446
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221 /* Open the old file */
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222 if ( (old_file = open (old_name, O_RDONLY)) < 0 )
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223 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
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428
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224
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225 if (fstat (old_file, &stat_buf) == -1)
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446
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226 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
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428
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227
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446
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228 /* map old file into the address space. */
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448
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229 old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size,
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230 PROT_READ, MAP_SHARED, old_file, 0);
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231 if (old_base == (caddr_t) MAP_FAILED)
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232 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
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428
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233
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446
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234 old_file_h = (ElfW(Ehdr) *) old_base;
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444
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235 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
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236 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
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446
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237 old_section_names = (const char *) old_base
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238 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
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428
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239
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446
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240 /* Find a section which we will grow by looking for the SHT_NOBITS
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241 * section with ALLOCATE flag and with the biggest address. */
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242 for (n = 1; n < old_file_h->e_shnum; n++) {
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243 ElfW(Shdr) * sh = & OLD_SECTION_H(n);
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428
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244
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446
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245 if ((sh->sh_type == SHT_NOBITS) && (sh->sh_flags & SHF_ALLOC)) {
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246 if ( old_bss_addr < sh->sh_addr ) {
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247 growme = sh;
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248 growme_index = n;
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249 new_data2_addr = old_bss_addr = sh->sh_addr;
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250 }
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251 }
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252 }
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428
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253
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446
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254 if (growme == NULL )
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255 fatal ("Can't find a section to grow\n", 0, 0);
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428
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256
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257 old_data_index = find_section (".data", old_section_names,
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258 old_name, old_file_h, old_section_h, 0);
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259
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444
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260 new_bss_addr = (ElfW(Addr)) sbrk (0);
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261 new_data2_size = new_bss_addr - old_bss_addr;
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428
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262 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
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446
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263 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
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428
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264
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446
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265 if ( new_bss_addr < old_bss_addr + growme->sh_size )
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266 fatal (".bss shrank when undumping???\n", 0, 0);
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428
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267
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446
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268 /* Set the output file to the right size and mmap it. */
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269 if ( (new_file = open (new_name, O_RDWR | O_CREAT, 0666)) < 0 )
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270 fatal ("Can't create (%s): errno %d\n", new_name, errno);
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428
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271
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446
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272 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
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428
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273
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274 if (ftruncate (new_file, new_file_size))
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446
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275 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
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428
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276
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444
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277 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
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278 PROT_READ | PROT_WRITE,
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446
|
279 #ifdef UNEXEC_USE_MAP_PRIVATE
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280 MAP_PRIVATE,
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444
|
281 #else
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446
|
282 MAP_SHARED,
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444
|
283 #endif
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|
446
|
284 new_file, 0);
|
|
428
|
285
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|
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286 if (new_base == (caddr_t) -1)
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|
446
|
287 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
|
|
428
|
288
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|
444
|
289 new_file_h = (ElfW(Ehdr) *) new_base;
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290 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
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446
|
291 new_section_h = (ElfW(Shdr) *) ((byte *) new_base + old_file_h->e_shoff +
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|
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292 new_data2_size);
|
|
428
|
293
|
|
|
294 /* Make our new file, program and section headers as copies of the
|
|
446
|
295 * originals. */
|
|
428
|
296 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
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|
|
297 memcpy (new_program_h, old_program_h,
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298 old_file_h->e_phnum * old_file_h->e_phentsize);
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299
|
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300 /* Modify the e_shstrndx if necessary. */
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301 PATCH_INDEX (new_file_h->e_shstrndx);
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302
|
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303 /* Fix up file header. We'll add one section. Section header is
|
|
446
|
304 * further away now. */
|
|
444
|
305 new_file_h->e_shoff += new_data2_size;
|
|
428
|
306 new_file_h->e_shnum += 1;
|
|
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307
|
|
446
|
308 /* Fix up a new program header by extending the writable data
|
|
|
309 * segment so that the bss area is covered too. Find that segment by
|
|
|
310 * looking for one that starts before and ends after the .bss and is
|
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|
311 * PT_LOADable. */
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|
312 for (n = new_file_h->e_phnum - 1; n >= 0; n--) {
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|
|
313 ElfW(Phdr) * ph = & NEW_PROGRAM_H(n);
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|
428
|
314 #ifdef DEBUG
|
|
446
|
315 printf ("%d @ %0x + %0x against %0x + %0x",
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|
|
316 n, ph->p_vaddr, ph->p_memsz,growme->sh_addr, growme->sh_size);
|
|
428
|
317 #endif
|
|
446
|
318 if ((ph->p_type == PT_LOAD) &&
|
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|
319 (ph->p_vaddr <= growme->sh_addr) &&
|
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320 ((ph->p_vaddr+ph->p_memsz) >= (growme->sh_addr + growme->sh_size))) {
|
|
|
321 /* Make sure that the size includes any padding before the
|
|
|
322 * old .bss section. */
|
|
|
323 ph->p_memsz = ph->p_filesz = new_bss_addr - ph->p_vaddr;
|
|
|
324 #ifdef DEBUG
|
|
|
325 puts (" That's the one!");
|
|
|
326 #endif
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|
|
327 break;
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|
|
328 }
|
|
|
329 #ifdef DEBUG
|
|
|
330 putchar ('\n');
|
|
|
331 #endif
|
|
|
332 }
|
|
428
|
333
|
|
446
|
334 if (n < 0)
|
|
|
335 fatal ("Couldn't find segment which covers %s",
|
|
|
336 old_section_names + growme->sh_name);
|
|
428
|
337
|
|
446
|
338 /* Walk through all section headers, insert the new data2 section
|
|
|
339 * right before the new bss section. */
|
|
|
340 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) {
|
|
|
341 ElfW(Shdr) * nsec = & NEW_SECTION_H(nn);
|
|
|
342 ElfW(Shdr) * osec = & OLD_SECTION_H(n);
|
|
428
|
343
|
|
446
|
344 /* If this is the section we want to grow, insert the new data
|
|
|
345 * section before it. */
|
|
|
346 if ( osec == growme ) {
|
|
|
347 /* Steal the data section header for this data2 section but
|
|
|
348 * use the * 'grow' section's alignment. This * will assure
|
|
|
349 * that the new section * always be placed in the same spot
|
|
|
350 * * as the old section by any other * application. */
|
|
|
351 ElfW(Shdr) * od = &OLD_SECTION_H(old_data_index);
|
|
444
|
352
|
|
446
|
353 memcpy (nsec, od, new_file_h->e_shentsize);
|
|
428
|
354
|
|
446
|
355 nsec->sh_addr = new_data2_addr;
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|
|
356 nsec->sh_offset = new_data2_offset;
|
|
|
357 nsec->sh_size = new_data2_size;
|
|
|
358 nsec->sh_addralign = osec->sh_addralign;
|
|
|
359
|
|
|
360 /* Copy over what we have in memory now. */
|
|
|
361 memcpy (nsec->sh_offset + new_base, (caddr_t) osec->sh_addr,
|
|
428
|
362 new_data2_size);
|
|
|
363 nn++;
|
|
446
|
364 grown = nsec++;
|
|
|
365 }
|
|
|
366
|
|
|
367 memcpy (nsec, osec, old_file_h->e_shentsize);
|
|
444
|
368
|
|
446
|
369 if ( osec == growme ) {
|
|
|
370 /* The new bss section's size is zero, and its file offset
|
|
|
371 * and virtual address should be off by NEW_DATA2_SIZE. */
|
|
|
372 nsec->sh_offset = grown->sh_offset + new_data2_size;
|
|
|
373 nsec->sh_addr = grown->sh_addr + new_data2_size;
|
|
444
|
374
|
|
446
|
375 /* Let the new bss section address alignment be the same as
|
|
|
376 * the section address alignment followed the old bss
|
|
|
377 * section, so this section will be placed in exactly the
|
|
|
378 * same place. */
|
|
|
379 nsec->sh_addralign = osec->sh_addralign;
|
|
|
380 nsec->sh_size = 0;
|
|
|
381 } else {
|
|
|
382 /* Any section that was originally placed AFTER the bss
|
|
|
383 * section should now be off by NEW_DATA2_SIZE. */
|
|
|
384 if ( round_up (nsec->sh_offset, growme->sh_addralign) >=
|
|
|
385 new_data2_offset)
|
|
|
386 nsec->sh_offset += new_data2_size;
|
|
|
387 }
|
|
|
388
|
|
|
389 /* Any section that was originally placed after the section *
|
|
|
390 * header table should now be off by the size of one section
|
|
|
391 * header table entry. */
|
|
|
392 if (nsec->sh_offset > new_file_h->e_shoff)
|
|
|
393 nsec->sh_offset += new_file_h->e_shentsize;
|
|
|
394
|
|
428
|
395
|
|
|
396 /* If any section hdr refers to the section after the new .data
|
|
446
|
397 * section, make it refer to next one because we have inserted a
|
|
|
398 * new section in between. */
|
|
|
399 PATCH_INDEX (nsec->sh_link);
|
|
|
400
|
|
|
401 /* For symbol tables, info is a symbol table index, so don't
|
|
|
402 * change it. */
|
|
|
403 if (nsec->sh_type != SHT_SYMTAB && nsec->sh_type != SHT_DYNSYM)
|
|
|
404 PATCH_INDEX (nsec->sh_info);
|
|
|
405
|
|
|
406 /* Any section which used to be NOBITS will now becomes PROGBITS
|
|
|
407 * if it's ALLOC-atable, unless, of cause, it's not the one we
|
|
|
408 * decided to grow */
|
|
|
409 if ( (osec->sh_type == SHT_NOBITS) && (osec->sh_flags & SHF_ALLOC) &&
|
|
|
410 (osec != growme ) ) {
|
|
|
411 nsec->sh_type = SHT_PROGBITS;
|
|
|
412 }
|
|
444
|
413
|
|
446
|
414 /* Now, start to copy the content of sections */
|
|
|
415 if ( nsec->sh_type != SHT_NULL || nsec->sh_type != SHT_NOBITS ) {
|
|
428
|
416
|
|
446
|
417 /* Write out the sections. .data and .data1 (and data2,
|
|
|
418 * called ".data" in the strings table) get copied from the
|
|
|
419 * current process instead of the old file. */
|
|
|
420 caddr_t src = old_base + osec->sh_offset;
|
|
|
421 const char * secname = old_section_names + nsec->sh_name;
|
|
|
422 const char * names[] = {
|
|
|
423 ".data",".sdata", ".lit4", ".lit8", ".sdata1", ".data1",
|
|
|
424 ".sbss", NULL};
|
|
|
425 int i;
|
|
|
426
|
|
|
427 for ( i=0; names[i] != NULL; i++ ) {
|
|
|
428 if ( ! strcmp (secname, names[i]) ) {
|
|
|
429 src = (caddr_t) osec->sh_addr;
|
|
|
430 break;
|
|
|
431 }
|
|
444
|
432 }
|
|
|
433
|
|
446
|
434 memcpy (nsec->sh_offset + new_base, src, nsec->sh_size);
|
|
|
435 }
|
|
444
|
436
|
|
446
|
437 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
438 old_name, old_file_h, old_section_h, 1);
|
|
444
|
439
|
|
|
440 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
446
|
441 if (nsec->sh_type == SHT_MIPS_DEBUG && old_mdebug_index != -1) {
|
|
|
442 int diff = nsec->sh_offset-OLD_SECTION_H(old_mdebug_index).sh_offset;
|
|
|
443 HDRR *phdr = (HDRR *)(nsec->sh_offset + new_base);
|
|
444
|
444
|
|
446
|
445 if (diff) {
|
|
444
|
446 phdr->cbLineOffset += diff;
|
|
|
447 phdr->cbDnOffset += diff;
|
|
|
448 phdr->cbPdOffset += diff;
|
|
|
449 phdr->cbSymOffset += diff;
|
|
|
450 phdr->cbOptOffset += diff;
|
|
|
451 phdr->cbAuxOffset += diff;
|
|
|
452 phdr->cbSsOffset += diff;
|
|
|
453 phdr->cbSsExtOffset += diff;
|
|
|
454 phdr->cbFdOffset += diff;
|
|
|
455 phdr->cbRfdOffset += diff;
|
|
|
456 phdr->cbExtOffset += diff;
|
|
446
|
457 }
|
|
|
458 }
|
|
444
|
459 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
460
|
|
|
461 #if __sgi
|
|
446
|
462 /* Adjust the HDRR offsets in .mdebug and copy the line data if
|
|
|
463 * it's in its usual 'hole' in the object. Makes the new file
|
|
|
464 * debuggable with dbx. patches up two problems: the absolute
|
|
|
465 * file offsets in the HDRR record of .mdebug (see
|
|
|
466 * /usr/include/syms.h), and the ld bug that gets the line table
|
|
|
467 * in a hole in the elf file rather than in the .mdebug section
|
|
|
468 * proper.
|
|
|
469 *
|
|
|
470 * David Anderson. davea@sgi.com Jan 16,1994 */
|
|
428
|
471 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
472 if (n_phdrr->__ct > 0) \
|
|
|
473 { \
|
|
|
474 n_phdrr->__fileaddr += movement; \
|
|
|
475 }
|
|
|
476
|
|
446
|
477 if (n == old_mdebug_index) {
|
|
|
478 HDRR * o_phdrr = (HDRR *)((byte *)old_base + osec->sh_offset);
|
|
|
479 HDRR * n_phdrr = (HDRR *)((byte *)new_base + nsec->sh_offset);
|
|
444
|
480 unsigned movement = new_data2_size;
|
|
428
|
481
|
|
|
482 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
483 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
484 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
485 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
486 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
487 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
488 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
489 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
490 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
491 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
446
|
492
|
|
|
493 /* The Line Section, being possible off in a hole of the
|
|
|
494 * object, requires special handling. */
|
|
|
495 if (n_phdrr->cbLine > 0) {
|
|
|
496 if (o_phdrr->cbLineOffset >
|
|
|
497 osec->sh_offset+ osec->sh_size){
|
|
|
498 /* line data is in a hole in elf. do special copy
|
|
|
499 * and adjust for this ld mistake. */
|
|
428
|
500 n_phdrr->cbLineOffset += movement;
|
|
|
501
|
|
|
502 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
503 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
446
|
504 } else {
|
|
|
505 /* somehow line data is in .mdebug as it is supposed
|
|
|
506 * to be. */
|
|
428
|
507 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
446
|
508 }
|
|
|
509 }
|
|
|
510 }
|
|
444
|
511 #endif /* __sgi */
|
|
446
|
512 /* If it is the symbol table, its st_shndx field needs to be
|
|
|
513 * patched. */
|
|
|
514 if (nsec->sh_type == SHT_SYMTAB || nsec->sh_type == SHT_DYNSYM) {
|
|
|
515 unsigned int num = nsec->sh_size / nsec->sh_entsize;
|
|
|
516 ElfW(Sym) * sym = (ElfW(Sym) *)(nsec->sh_offset + new_base);
|
|
|
517 byte *symnames = ((byte *) new_base +
|
|
|
518 NEW_SECTION_H (nsec->sh_link).sh_offset);
|
|
428
|
519
|
|
446
|
520 for (; num--; sym++) {
|
|
|
521 const char * symnam = (char *) (symnames + sym->st_name);
|
|
|
522
|
|
|
523 /* Update the symbol values of _edata and _end. */
|
|
|
524 if (strcmp (symnam, "_end") == 0
|
|
|
525 || strcmp (symnam, "end") == 0
|
|
|
526 || strcmp (symnam, "_edata") == 0
|
|
|
527 || strcmp (symnam, "edata") == 0)
|
|
|
528 memcpy (&sym->st_value, &new_bss_addr,sizeof (new_bss_addr));
|
|
|
529
|
|
|
530
|
|
|
531 if ((sym->st_shndx == SHN_UNDEF) || (sym->st_shndx == SHN_ABS)
|
|
|
532 || (sym->st_shndx == SHN_COMMON)
|
|
|
533 || (sym->st_shndx >= SHN_LOPROC &&
|
|
|
534 sym->st_shndx <= SHN_HIPROC))
|
|
|
535 continue;
|
|
444
|
536
|
|
428
|
537 PATCH_INDEX (sym->st_shndx);
|
|
446
|
538 }
|
|
|
539 }
|
|
|
540 }
|
|
444
|
541
|
|
|
542 /* This loop seeks out relocation sections for the data section, so
|
|
446
|
543 * that it can undo relocations performed by the runtime linker. */
|
|
|
544 for (n = new_file_h->e_shnum - 1; n; n--) {
|
|
444
|
545 ElfW(Shdr) section = NEW_SECTION_H (n);
|
|
446
|
546
|
|
|
547 if ( section.sh_type == SHT_REL || section.sh_type == SHT_RELA ) {
|
|
|
548 /* This code handles two different size structs, but there
|
|
|
549 * should be no harm in that provided that r_offset is
|
|
|
550 * always the first member. */
|
|
|
551 ElfW(Shdr) * info = & NEW_SECTION_H(section.sh_info);
|
|
|
552 const char * nm = old_section_names + info->sh_name;
|
|
|
553
|
|
|
554 if (!strcmp (nm, ".data") || !strcmp (nm, ".sdata")
|
|
|
555 || !strcmp (nm, ".lit4") || !strcmp (nm, ".lit8")
|
|
|
556 || !strcmp (nm, ".sdata1") || !strcmp (nm, ".data1")) {
|
|
|
557 ElfW(Addr) offset = info->sh_addr - info->sh_offset;
|
|
|
558 caddr_t end, reloc = old_base + section.sh_offset;
|
|
|
559
|
|
|
560 for (end = reloc + section.sh_size; reloc < end;
|
|
|
561 reloc += section.sh_entsize) {
|
|
|
562 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
|
|
444
|
563 #ifdef __alpha__
|
|
446
|
564 /* The Alpha ELF binutils currently have a bug that
|
|
|
565 * sometimes results in relocs that contain all
|
|
|
566 * zeroes. Work around this for now... */
|
|
|
567 if (((ElfW(Rel) *) reloc)->r_offset == 0)
|
|
|
568 continue;
|
|
444
|
569 #endif
|
|
446
|
570 memcpy (new_base + addr, old_base + addr,
|
|
|
571 sizeof(ElfW(Addr)));
|
|
444
|
572 }
|
|
|
573 }
|
|
|
574 }
|
|
446
|
575 }
|
|
444
|
576
|
|
|
577 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
578 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
446
|
579 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
444
|
580
|
|
|
581 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
446
|
582 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
444
|
583 #endif
|
|
|
584
|
|
428
|
585 /* Close the files and make the new file executable. */
|
|
|
586 if (close (old_file))
|
|
446
|
587 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
428
|
588
|
|
|
589 if (close (new_file))
|
|
446
|
590 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
428
|
591
|
|
|
592 if (stat (new_name, &stat_buf) == -1)
|
|
446
|
593 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
428
|
594
|
|
|
595 n = umask (777);
|
|
|
596 umask (n);
|
|
|
597 stat_buf.st_mode |= 0111 & ~n;
|
|
|
598 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
446
|
599 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
428
|
600 }
|
