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367
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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000
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0
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2 Free Software Foundation, Inc.
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3
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367
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4 This file is part of XEmacs.
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0
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5
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367
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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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0
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10
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367
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11 GNU Emacs 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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0
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15
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367
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16 You should have received a copy of the GNU General Public License
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17 along with GNU Emacs; 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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0
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20
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367
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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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0
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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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367
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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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0
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42 *
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367
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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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0
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49 *
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367
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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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0
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56 *
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367
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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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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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65 *
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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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0
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70 */
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71
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367
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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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0
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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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87 #include <elf.h>
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88 #include <sys/mman.h>
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367
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89 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
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90 #include <sys/elf_mips.h>
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91 #include <sym.h>
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92 #endif /* __sony_news && _SYSTYPE_SYSV */
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93 #if __sgi
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94 #include <syms.h> /* for HDRR declaration */
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95 #endif /* __sgi */
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0
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96
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367
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97 #if __GNU_LIBRARY__ - 0 >= 6
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98 # include <link.h> /* get ElfW etc */
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163
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99 #endif
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100
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367
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101 #ifndef ElfW
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102 # ifdef __STDC__
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103 # define ElfBitsW(bits, type) Elf##bits##_##type
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104 # else
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105 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
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106 # endif
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107 # ifdef _LP64
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108 # define ELFSIZE 64
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109 # else
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110 # define ELFSIZE 32
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111 # endif
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112 /* This macro expands `bits' before invoking ElfBitsW. */
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113 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
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114 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
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115 #endif
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116
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117 #ifndef ELF_BSS_SECTION_NAME
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118 #define ELF_BSS_SECTION_NAME ".bss"
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119 #endif
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163
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120
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0
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121 /* Get the address of a particular section or program header entry,
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367
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122 * accounting for the size of the entries. */
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0
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123
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124 #define OLD_SECTION_H(n) \
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367
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125 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
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0
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126 #define NEW_SECTION_H(n) \
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367
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127 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
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0
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128 #define OLD_PROGRAM_H(n) \
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367
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129 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
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0
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130 #define NEW_PROGRAM_H(n) \
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367
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131 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
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0
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132
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133 #define PATCH_INDEX(n) \
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134 do { \
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367
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135 if ((int) (n) >= growme_index) \
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0
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136 (n)++; } while (0)
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367
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137
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0
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138 typedef unsigned char byte;
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139
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140 /* Round X up to a multiple of Y. */
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141
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367
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142 static ElfW(Addr)
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143 round_up (ElfW(Addr) x, ElfW(Addr) y)
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0
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144 {
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145 int rem = x % y;
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146 if (rem == 0)
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147 return x;
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148 return x - rem + y;
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149 }
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150
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151 /* Return the index of the section named NAME.
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152 SECTION_NAMES, FILE_NAME and FILE_H give information
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153 about the file we are looking in.
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154
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155 If we don't find the section NAME, that is a fatal error
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156 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
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157
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158 static int
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367
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159 find_section (char *name,
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160 const char *section_names,
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161 char *file_name,
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162 ElfW(Ehdr) *old_file_h,
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163 ElfW(Shdr) *old_section_h,
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164 int noerror)
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0
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165 {
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166 int idx;
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167
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168 for (idx = 1; idx < old_file_h->e_shnum; idx++)
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169 {
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170 #ifdef DEBUG
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171 fprintf (stderr, "Looking for %s - found %s\n", name,
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172 section_names + OLD_SECTION_H (idx).sh_name);
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173 #endif
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174 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
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175 name))
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367
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176 return idx;
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0
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177 }
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178
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367
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179 /* If we're here, we found nothing or return did not work */
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180 if ( ! noerror)
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181 fatal ("Can't find %s in %s.\n", name, file_name);
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182
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183 return -1;
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0
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184 }
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185
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186 /* ****************************************************************
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187 * unexec
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188 *
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189 * driving logic.
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190 *
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191 * In ELF, this works by replacing the old .bss section with a new
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192 * .data section, and inserting an empty .bss immediately afterwards.
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193 *
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194 */
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367
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195 void
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196 unexec (char *new_name,
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197 char *old_name,
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198 uintptr_t data_start,
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199 uintptr_t bss_start,
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200 uintptr_t entry_address)
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0
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201 {
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367
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202 int old_file;
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0
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203
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367
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204 struct stat stat_buf;
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0
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205 caddr_t old_base, new_base;
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206
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367
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207 ElfW(Ehdr) *old_file_h, * new_file_h;
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208 ElfW(Phdr) *old_program_h, * new_program_h;
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209 ElfW(Shdr) *old_section_h, * new_section_h;
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210 ElfW(Shdr) * growme = NULL, * grown = NULL;
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211 ElfW(Addr) old_bss_addr = 0, new_data2_addr = 0;
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0
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212
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367
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213 int growme_index = -1;
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214 int n, nn;
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215 const char *old_section_names;
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216 int old_mdebug_index, old_data_index;
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217 int new_bss_addr, new_data2_size, new_data2_offset, new_file, new_file_size;
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0
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218
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367
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219 /* Open the old file */
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220 if ( (old_file = open (old_name, O_RDONLY)) < 0 )
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221 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
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0
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222
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223 if (fstat (old_file, &stat_buf) == -1)
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367
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224 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
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0
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225
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367
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226 /* map old file into the address space. */
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227 old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size,
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228 PROT_READ, MAP_SHARED, old_file, 0);
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229 if (old_base == (caddr_t) MAP_FAILED)
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230 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
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0
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231
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367
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232 old_file_h = (ElfW(Ehdr) *) old_base;
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233 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
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234 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
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235 old_section_names = (const char *) old_base
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236 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
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0
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237
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367
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238 /* Find a section which we will grow by looking for the SHT_NOBITS
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239 * section with ALLOCATE flag and with the biggest address. */
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240 for (n = 1; n < old_file_h->e_shnum; n++) {
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241 ElfW(Shdr) * sh = & OLD_SECTION_H(n);
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167
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242
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367
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243 if ((sh->sh_type == SHT_NOBITS) && (sh->sh_flags & SHF_ALLOC)) {
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244 if ( old_bss_addr < sh->sh_addr ) {
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245 growme = sh;
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246 growme_index = n;
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247 new_data2_addr = old_bss_addr = sh->sh_addr;
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248 }
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249 }
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250 }
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0
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251
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367
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252 if (growme == NULL )
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253 fatal ("Can't find a section to grow\n", 0, 0);
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0
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254
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255 old_data_index = find_section (".data", old_section_names,
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256 old_name, old_file_h, old_section_h, 0);
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257
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367
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258 new_bss_addr = (ElfW(Addr)) sbrk (0);
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259 new_data2_size = new_bss_addr - old_bss_addr;
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0
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260 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
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367
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261 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
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0
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262
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367
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263 if ( new_bss_addr < old_bss_addr + growme->sh_size )
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264 fatal (".bss shrank when undumping???\n", 0, 0);
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0
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265
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367
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266 /* Set the output file to the right size and mmap it. */
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267 if ( (new_file = open (new_name, O_RDWR | O_CREAT, 0666)) < 0 )
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268 fatal ("Can't create (%s): errno %d\n", new_name, errno);
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0
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269
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367
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270 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
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0
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271
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272 if (ftruncate (new_file, new_file_size))
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367
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273 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
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0
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274
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367
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275 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
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276 PROT_READ | PROT_WRITE,
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277 #ifdef UNEXEC_USE_MAP_PRIVATE
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278 MAP_PRIVATE,
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279 #else
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280 MAP_SHARED,
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281 #endif
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282 new_file, 0);
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0
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283
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284 if (new_base == (caddr_t) -1)
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367
|
285 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
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0
|
286
|
|
367
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287 new_file_h = (ElfW(Ehdr) *) new_base;
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288 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
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289 new_section_h = (ElfW(Shdr) *) ((byte *) new_base + old_file_h->e_shoff +
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290 new_data2_size);
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0
|
291
|
|
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292 /* Make our new file, program and section headers as copies of the
|
|
367
|
293 * originals. */
|
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0
|
294 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
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295 memcpy (new_program_h, old_program_h,
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296 old_file_h->e_phnum * old_file_h->e_phentsize);
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297
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298 /* Modify the e_shstrndx if necessary. */
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299 PATCH_INDEX (new_file_h->e_shstrndx);
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300
|
|
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301 /* Fix up file header. We'll add one section. Section header is
|
|
367
|
302 * further away now. */
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303 new_file_h->e_shoff += new_data2_size;
|
|
0
|
304 new_file_h->e_shnum += 1;
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305
|
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367
|
306 /* Fix up a new program header by extending the writable data
|
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307 * segment so that the bss area is covered too. Find that segment by
|
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|
308 * looking for one that starts before and ends after the .bss and is
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309 * PT_LOADable. */
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310 for (n = new_file_h->e_phnum - 1; n >= 0; n--) {
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311 ElfW(Phdr) * ph = & NEW_PROGRAM_H(n);
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359
|
312 #ifdef DEBUG
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|
313 printf ("%d @ %0x + %0x against %0x + %0x",
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|
367
|
314 n, ph->p_vaddr, ph->p_memsz,growme->sh_addr, growme->sh_size);
|
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0
|
315 #endif
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|
367
|
316 if ((ph->p_type == PT_LOAD) &&
|
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317 (ph->p_vaddr <= growme->sh_addr) &&
|
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318 ((ph->p_vaddr+ph->p_memsz) >= (growme->sh_addr + growme->sh_size))) {
|
|
|
319 /* Make sure that the size includes any padding before the
|
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|
320 * old .bss section. */
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|
321 ph->p_memsz = ph->p_filesz = new_bss_addr - ph->p_vaddr;
|
|
359
|
322 #ifdef DEBUG
|
|
367
|
323 puts (" That's the one!");
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|
359
|
324 #endif
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|
367
|
325 break;
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359
|
326 }
|
|
|
327 #ifdef DEBUG
|
|
|
328 putchar ('\n');
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|
|
329 #endif
|
|
367
|
330 }
|
|
0
|
331
|
|
367
|
332 if (n < 0)
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|
|
333 fatal ("Couldn't find segment which covers %s",
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|
|
334 old_section_names + growme->sh_name);
|
|
0
|
335
|
|
367
|
336 /* Walk through all section headers, insert the new data2 section
|
|
|
337 * right before the new bss section. */
|
|
|
338 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) {
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|
|
339 ElfW(Shdr) * nsec = & NEW_SECTION_H(nn);
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|
|
340 ElfW(Shdr) * osec = & OLD_SECTION_H(n);
|
|
0
|
341
|
|
367
|
342 /* If this is the section we want to grow, insert the new data
|
|
|
343 * section before it. */
|
|
|
344 if ( osec == growme ) {
|
|
|
345 /* Steal the data section header for this data2 section but
|
|
|
346 * use the * 'grow' section's alignment. This * will assure
|
|
|
347 * that the new section * always be placed in the same spot
|
|
|
348 * * as the old section by any other * application. */
|
|
|
349 ElfW(Shdr) * od = &OLD_SECTION_H(old_data_index);
|
|
0
|
350
|
|
367
|
351 memcpy (nsec, od, new_file_h->e_shentsize);
|
|
0
|
352
|
|
367
|
353 nsec->sh_addr = new_data2_addr;
|
|
|
354 nsec->sh_offset = new_data2_offset;
|
|
|
355 nsec->sh_size = new_data2_size;
|
|
|
356 nsec->sh_addralign = osec->sh_addralign;
|
|
|
357
|
|
|
358 /* Copy over what we have in memory now. */
|
|
|
359 memcpy (nsec->sh_offset + new_base, (caddr_t) osec->sh_addr,
|
|
0
|
360 new_data2_size);
|
|
|
361 nn++;
|
|
367
|
362 grown = nsec++;
|
|
|
363 }
|
|
|
364
|
|
|
365 memcpy (nsec, osec, old_file_h->e_shentsize);
|
|
|
366
|
|
|
367 if ( osec == growme ) {
|
|
|
368 /* The new bss section's size is zero, and its file offset
|
|
|
369 * and virtual address should be off by NEW_DATA2_SIZE. */
|
|
|
370 nsec->sh_offset = grown->sh_offset + new_data2_size;
|
|
|
371 nsec->sh_addr = grown->sh_addr + new_data2_size;
|
|
0
|
372
|
|
367
|
373 /* Let the new bss section address alignment be the same as
|
|
|
374 * the section address alignment followed the old bss
|
|
|
375 * section, so this section will be placed in exactly the
|
|
|
376 * same place. */
|
|
|
377 nsec->sh_addralign = osec->sh_addralign;
|
|
|
378 nsec->sh_size = 0;
|
|
|
379 } else {
|
|
|
380 /* Any section that was originally placed AFTER the bss
|
|
|
381 * section should now be off by NEW_DATA2_SIZE. */
|
|
|
382 if ( round_up (nsec->sh_offset, growme->sh_addralign) >=
|
|
|
383 new_data2_offset)
|
|
|
384 nsec->sh_offset += new_data2_size;
|
|
|
385 }
|
|
|
386
|
|
|
387 /* Any section that was originally placed after the section *
|
|
|
388 * header table should now be off by the size of one section
|
|
|
389 * header table entry. */
|
|
|
390 if (nsec->sh_offset > new_file_h->e_shoff)
|
|
|
391 nsec->sh_offset += new_file_h->e_shentsize;
|
|
|
392
|
|
|
393
|
|
0
|
394 /* If any section hdr refers to the section after the new .data
|
|
367
|
395 * section, make it refer to next one because we have inserted a
|
|
|
396 * new section in between. */
|
|
|
397 PATCH_INDEX (nsec->sh_link);
|
|
|
398
|
|
|
399 /* For symbol tables, info is a symbol table index, so don't
|
|
|
400 * change it. */
|
|
|
401 if (nsec->sh_type != SHT_SYMTAB && nsec->sh_type != SHT_DYNSYM)
|
|
|
402 PATCH_INDEX (nsec->sh_info);
|
|
|
403
|
|
|
404 /* Any section which used to be NOBITS will now becomes PROGBITS
|
|
|
405 * if it's ALLOC-atable, unless, of cause, it's not the one we
|
|
|
406 * decided to grow */
|
|
|
407 if ( (osec->sh_type == SHT_NOBITS) && (osec->sh_flags & SHF_ALLOC) &&
|
|
|
408 (osec != growme ) ) {
|
|
|
409 nsec->sh_type = SHT_PROGBITS;
|
|
|
410 }
|
|
|
411
|
|
|
412 /* Now, start to copy the content of sections */
|
|
|
413 if ( nsec->sh_type != SHT_NULL || nsec->sh_type != SHT_NOBITS ) {
|
|
|
414
|
|
|
415 /* Write out the sections. .data and .data1 (and data2,
|
|
|
416 * called ".data" in the strings table) get copied from the
|
|
|
417 * current process instead of the old file. */
|
|
|
418 caddr_t src = old_base + osec->sh_offset;
|
|
|
419 const char * secname = old_section_names + nsec->sh_name;
|
|
|
420 const char * names[] = {
|
|
|
421 ".data",".sdata", ".lit4", ".lit8", ".sdata1", ".data1",
|
|
|
422 ".sbss", NULL};
|
|
|
423 int i;
|
|
|
424
|
|
|
425 for ( i=0; names[i] != NULL; i++ ) {
|
|
|
426 if ( ! strcmp (secname, names[i]) ) {
|
|
|
427 src = (caddr_t) osec->sh_addr;
|
|
|
428 break;
|
|
|
429 }
|
|
|
430 }
|
|
163
|
431
|
|
367
|
432 memcpy (nsec->sh_offset + new_base, src, nsec->sh_size);
|
|
|
433 }
|
|
|
434
|
|
|
435 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
436 old_name, old_file_h, old_section_h, 1);
|
|
|
437
|
|
|
438 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
|
439 if (nsec->sh_type == SHT_MIPS_DEBUG && old_mdebug_index != -1) {
|
|
|
440 int diff = nsec->sh_offset-OLD_SECTION_H(old_mdebug_index).sh_offset;
|
|
|
441 HDRR *phdr = (HDRR *)(nsec->sh_offset + new_base);
|
|
0
|
442
|
|
367
|
443 if (diff) {
|
|
|
444 phdr->cbLineOffset += diff;
|
|
|
445 phdr->cbDnOffset += diff;
|
|
|
446 phdr->cbPdOffset += diff;
|
|
|
447 phdr->cbSymOffset += diff;
|
|
|
448 phdr->cbOptOffset += diff;
|
|
|
449 phdr->cbAuxOffset += diff;
|
|
|
450 phdr->cbSsOffset += diff;
|
|
|
451 phdr->cbSsExtOffset += diff;
|
|
|
452 phdr->cbFdOffset += diff;
|
|
|
453 phdr->cbRfdOffset += diff;
|
|
|
454 phdr->cbExtOffset += diff;
|
|
|
455 }
|
|
|
456 }
|
|
|
457 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
458
|
|
|
459 #if __sgi
|
|
|
460 /* Adjust the HDRR offsets in .mdebug and copy the line data if
|
|
|
461 * it's in its usual 'hole' in the object. Makes the new file
|
|
|
462 * debuggable with dbx. patches up two problems: the absolute
|
|
|
463 * file offsets in the HDRR record of .mdebug (see
|
|
|
464 * /usr/include/syms.h), and the ld bug that gets the line table
|
|
|
465 * in a hole in the elf file rather than in the .mdebug section
|
|
|
466 * proper.
|
|
|
467 *
|
|
|
468 * David Anderson. davea@sgi.com Jan 16,1994 */
|
|
0
|
469 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
470 if (n_phdrr->__ct > 0) \
|
|
|
471 { \
|
|
|
472 n_phdrr->__fileaddr += movement; \
|
|
|
473 }
|
|
|
474
|
|
367
|
475 if (n == old_mdebug_index) {
|
|
|
476 HDRR * o_phdrr = (HDRR *)((byte *)old_base + osec->sh_offset);
|
|
|
477 HDRR * n_phdrr = (HDRR *)((byte *)new_base + nsec->sh_offset);
|
|
|
478 unsigned movement = new_data2_size;
|
|
0
|
479
|
|
|
480 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
481 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
482 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
483 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
484 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
485 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
486 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
487 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
488 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
489 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
367
|
490
|
|
|
491 /* The Line Section, being possible off in a hole of the
|
|
|
492 * object, requires special handling. */
|
|
|
493 if (n_phdrr->cbLine > 0) {
|
|
|
494 if (o_phdrr->cbLineOffset >
|
|
|
495 osec->sh_offset+ osec->sh_size){
|
|
|
496 /* line data is in a hole in elf. do special copy
|
|
|
497 * and adjust for this ld mistake. */
|
|
0
|
498 n_phdrr->cbLineOffset += movement;
|
|
|
499
|
|
|
500 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
501 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
367
|
502 } else {
|
|
|
503 /* somehow line data is in .mdebug as it is supposed
|
|
|
504 * to be. */
|
|
0
|
505 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
367
|
506 }
|
|
|
507 }
|
|
|
508 }
|
|
|
509 #endif /* __sgi */
|
|
|
510 /* If it is the symbol table, its st_shndx field needs to be
|
|
|
511 * patched. */
|
|
|
512 if (nsec->sh_type == SHT_SYMTAB || nsec->sh_type == SHT_DYNSYM) {
|
|
|
513 unsigned int num = nsec->sh_size / nsec->sh_entsize;
|
|
|
514 ElfW(Sym) * sym = (ElfW(Sym) *)(nsec->sh_offset + new_base);
|
|
|
515 byte *symnames = ((byte *) new_base +
|
|
|
516 NEW_SECTION_H (nsec->sh_link).sh_offset);
|
|
|
517
|
|
|
518 for (; num--; sym++) {
|
|
|
519 const char * symnam = (char *) (symnames + sym->st_name);
|
|
|
520
|
|
|
521 /* Update the symbol values of _edata and _end. */
|
|
|
522 if (strcmp (symnam, "_end") == 0
|
|
|
523 || strcmp (symnam, "end") == 0
|
|
|
524 || strcmp (symnam, "_edata") == 0
|
|
|
525 || strcmp (symnam, "edata") == 0)
|
|
|
526 memcpy (&sym->st_value, &new_bss_addr,sizeof (new_bss_addr));
|
|
|
527
|
|
|
528
|
|
|
529 if ((sym->st_shndx == SHN_UNDEF) || (sym->st_shndx == SHN_ABS)
|
|
|
530 || (sym->st_shndx == SHN_COMMON)
|
|
|
531 || (sym->st_shndx >= SHN_LOPROC &&
|
|
|
532 sym->st_shndx <= SHN_HIPROC))
|
|
|
533 continue;
|
|
|
534
|
|
|
535 PATCH_INDEX (sym->st_shndx);
|
|
|
536 }
|
|
|
537 }
|
|
|
538 }
|
|
0
|
539
|
|
367
|
540 /* This loop seeks out relocation sections for the data section, so
|
|
|
541 * that it can undo relocations performed by the runtime linker. */
|
|
|
542 for (n = new_file_h->e_shnum - 1; n; n--) {
|
|
|
543 ElfW(Shdr) section = NEW_SECTION_H (n);
|
|
|
544
|
|
|
545 if ( section.sh_type == SHT_REL || section.sh_type == SHT_RELA ) {
|
|
|
546 /* This code handles two different size structs, but there
|
|
|
547 * should be no harm in that provided that r_offset is
|
|
|
548 * always the first member. */
|
|
|
549 ElfW(Shdr) * info = & NEW_SECTION_H(section.sh_info);
|
|
|
550 const char * nm = old_section_names + info->sh_name;
|
|
|
551
|
|
|
552 if (!strcmp (nm, ".data") || !strcmp (nm, ".sdata")
|
|
|
553 || !strcmp (nm, ".lit4") || !strcmp (nm, ".lit8")
|
|
|
554 || !strcmp (nm, ".sdata1") || !strcmp (nm, ".data1")) {
|
|
|
555 ElfW(Addr) offset = info->sh_addr - info->sh_offset;
|
|
|
556 caddr_t end, reloc = old_base + section.sh_offset;
|
|
|
557
|
|
|
558 for (end = reloc + section.sh_size; reloc < end;
|
|
|
559 reloc += section.sh_entsize) {
|
|
|
560 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
|
|
|
561 #ifdef __alpha__
|
|
|
562 /* The Alpha ELF binutils currently have a bug that
|
|
|
563 * sometimes results in relocs that contain all
|
|
|
564 * zeroes. Work around this for now... */
|
|
|
565 if (((ElfW(Rel) *) reloc)->r_offset == 0)
|
|
|
566 continue;
|
|
|
567 #endif
|
|
|
568 memcpy (new_base + addr, old_base + addr,
|
|
|
569 sizeof(ElfW(Addr)));
|
|
|
570 }
|
|
|
571 }
|
|
|
572 }
|
|
|
573 }
|
|
|
574
|
|
|
575 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
576 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
|
577 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
|
578
|
|
|
579 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
|
580 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
|
581 #endif
|
|
0
|
582
|
|
|
583 /* Close the files and make the new file executable. */
|
|
|
584 if (close (old_file))
|
|
367
|
585 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
0
|
586
|
|
|
587 if (close (new_file))
|
|
367
|
588 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
0
|
589
|
|
|
590 if (stat (new_name, &stat_buf) == -1)
|
|
367
|
591 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
0
|
592
|
|
|
593 n = umask (777);
|
|
|
594 umask (n);
|
|
|
595 stat_buf.st_mode |= 0111 & ~n;
|
|
|
596 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
367
|
597 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
0
|
598 }
|
