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0
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1 /*
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2 * Code to do an unexec for HPUX 8.0 on an HP9000/[34]00 for a
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3 * dynamically linked temacs.
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4
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5 Copyright (C) 1992-1993 Free Software Foundation, Inc.
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6
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7 This file is part of XEmacs.
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8
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9 XEmacs is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 2, or (at your option) any
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12 later version.
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13
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with XEmacs; see the file COPYING. If not, write to
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21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 Boston, MA 02111-1307, USA. */
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23
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24 /* Synched up with: Not in FSF. */
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25
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26 /*
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27 Created 29-Oct-92 by Harlan Sexton for SunOS
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28
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29 Modified Jan 93 by Hamish Macdonald for HPUX
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30 */
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31
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32 /********************** Included .h Files **************************/
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33
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34 #include <config.h>
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35
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36 #include <stdarg.h>
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37 #include <sys/param.h>
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38 #include <sys/file.h>
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39 #include <sys/stat.h>
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40 #include <sys/types.h>
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41 #include <string.h>
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42 #include <stdio.h>
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43 #include <signal.h>
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44 #include <a.out.h>
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45 #include <unistd.h>
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46 #include <ctype.h>
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47 #include <sys/dir.h>
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48
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49 #include "sysdep.h"
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50
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51 /* XEmacs: Richard Cognot <cognot@ensg.u-nancy.fr> says we need these */
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52 extern void perror(const char*);
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53 extern int sys_nerr;
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54 extern char *sys_errlist[];
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55 extern char *strerror (int);
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56
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57
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58 /********************** Macros *************************************/
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59
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60 #define SYS_ERR \
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61 ((errno > 0)?((errno < sys_nerr)?(sys_errlist[errno]):\
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62 "unknown system error"): "unknown error")
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63
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64 #define MASK_UP(x,p_of_two) \
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65 ((((unsigned long) (x)) + ((p_of_two) - 1)) & (~((p_of_two) - 1)))
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66
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67 #define MASK_DOWN(x,p_of_two) (((unsigned long) (x)) & (~((p_of_two) - 1)))
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68
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69 /********************** Function Prototypes/Declarations ***********/
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70
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71 static void unexec_error (const char *fmt, int use_errno, ...);
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72 static int unexec_open (char *filename, int flag, int mode);
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73 static long unexec_seek (int fd, long position);
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74 static void unexec_read (int fd, long position, char *buf, int bytes);
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75 static void unexec_write (int fd, long position, char *buf, int bytes);
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76 static void unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos,
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77 int bytes);
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78 static void unexec_pad (int fd, int bytes);
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79 static void unexec_fstat (int fd, struct stat *statptr);
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80 static void unexec_fchmod (int fd, int mode);
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81 int run_time_remap (char *dummy);
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82
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83 /********************** Variables **********************************/
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84
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85 /* for reporting error messages from system calls */
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86 extern int sys_nerr;
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87 extern int errno;
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88 extern int _DYNAMIC;
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89 extern char **environ;
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90
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91 static unsigned long sbrk_of_0_at_unexec;
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92
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93 /*******************************************************************/
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94
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95 static void
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96 unexec_error (const char *fmt, int use_errno, ...)
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97 {
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98 const char *err_msg = SYS_ERR;
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99 va_list args;
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100
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101 fprintf (stderr, "unexec - ");
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102 va_start (args, use_errno);
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103 vfprintf (stderr, fmt, args);
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104 va_end (args);
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105
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106 if (use_errno)
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107 fprintf (stderr, ": %s", err_msg);
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108 fprintf (stderr, "\n");
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109 exit (1);
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110 return;
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111 }
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112
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113 static int
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114 unexec_open (char *filename, int flag, int mode)
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115 {
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116 int fd;
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117
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118 errno = 0;
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119
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120 fd = open (filename, flag, mode);
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121
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122 if (fd < 0)
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123 {
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124 unexec_error ("Failure opening file %s", 1, (void *) filename, 0, 0);
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125 return -1;
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126 }
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127 else
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128 return fd;
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129 }
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130
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131 static long
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132 unexec_seek (int fd, long position)
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133 {
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134 long seek_value;
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135
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136 if (fd <= 0)
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137 unexec_error ("No file open in which to seek", 0, 0, 0, 0);
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138
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139 errno = 0;
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140
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141 if (position < 0)
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142 seek_value = (long) lseek (fd, 0, L_INCR);
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143 else
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144 seek_value = (long) lseek (fd, position, L_SET);
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145
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146 if (seek_value < 0)
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147 unexec_error ("Failed to do a seek to 0x%x in %s", 1,
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148 (char *) position, "unexec() output file", 0);
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149
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150 return seek_value;
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151 }
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152
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153 static void
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154 unexec_read (int fd, long position, char *buf, int bytes)
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155 {
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156 int n_read;
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157 int remains = bytes;
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158 position = unexec_seek (fd, position);
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159
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160 if (bytes < 0)
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161 unexec_error ("Attempted read of %d bytes", 0, (char *) bytes, 0, 0);
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162
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163 errno = 0;
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164
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165 while (remains > 0)
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166 {
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167 n_read = read (fd, buf, remains);
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168 if (n_read <= 0)
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169 unexec_error ("Read failed for 0x%x bytes at offset 0x%x in %s",
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170 1, (char *) bytes, (char *) position,
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171 "unexec() output file");
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172 buf += n_read;
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173 remains -= n_read;
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174 }
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175
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176 return;
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177 }
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178
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179 static void
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180 unexec_write (int fd, long position, char *buf, int bytes)
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181 {
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182 int n_written;
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183 int remains = bytes;
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184 position = unexec_seek (fd, position);
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185
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186 if (bytes < 0)
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187 unexec_error ("Attempted write of %d bytes in %s",
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188 0, (char *) bytes, "unexec() output file", 0);
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189
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190 errno = 0;
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191
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192 while (remains > 0)
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193 {
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194 n_written = write (fd, buf, remains);
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195 if (n_written <= 0)
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196 unexec_error ("Write failed for 0x%x bytes at offset 0x%x in %s",
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197 1, (char *) bytes, (char *) position,
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198 "unexec() output file");
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199 buf += n_written;
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200 remains -= n_written;
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201 }
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202
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203 return;
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204 }
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205
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206 static void
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207 unexec_copy (int new_fd, int old_fd, long old_pos, long new_pos, int bytes)
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208 {
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209 int remains = bytes;
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210 char buf[128];
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211
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212 while (remains > 0)
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213 {
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214 int n_to_copy = remains > sizeof(buf) ? sizeof(buf) : remains;
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215
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216 unexec_read (old_fd, old_pos, buf, n_to_copy);
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217 unexec_write (new_fd, new_pos, buf, n_to_copy);
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218
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219 old_pos += n_to_copy;
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220 new_pos += n_to_copy;
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221 remains -= n_to_copy;
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222 }
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223
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224 return;
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225 }
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226
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227 static void
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228 unexec_pad (int fd, int bytes)
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229 {
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230 if (bytes > 0)
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231 {
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232 char buf[1024];
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233 int remaining = bytes;
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234
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235 bzero (buf, sizeof(buf));
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236
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237 while (remaining > 0)
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238 {
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239 int this_write = (remaining > sizeof(buf))?sizeof(buf):remaining;
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240 unexec_write (fd, -1, buf, this_write);
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241 remaining -= this_write;
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242 }
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243 }
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244 }
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245
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246 static void
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247 unexec_fstat (int fd, struct stat *statptr)
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248 {
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249 errno = 0;
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250 if (-1 == fstat (fd, statptr))
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251 unexec_error ("fstat() failed for descriptor %d", 1, (char *) fd, 0, 0);
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252 return;
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253 }
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254
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255 static void
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256 unexec_fchmod (int fd, int mode)
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257 {
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258 errno = 0;
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259 if (-1 == fchmod (fd, mode))
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260 unexec_error ("fchmod() failed for descriptor %d", 1, (char *) fd, 0, 0);
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261 return;
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262 }
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263
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264 /*
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265 * EXPORTED FUNCTIONS
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266 */
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267
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268 /* this has to be a global variable to prevent the optimizers from
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269 * assuming that it can not be 0.
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270 */
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271 static void *dynamic_addr = (void *) &_DYNAMIC;
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272
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273 int
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274 unexec (char *new_name, char *old_name,
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275 unsigned int emacs_edata, unsigned int dummy1, unsigned int dummy2)
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276 {
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277 /* /dld.sl data */
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278 struct dynamic *ld = 0;
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279 /* old and new state */
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280 int old_fd;
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281 int new_fd;
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282 struct exec old_hdr;
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283 struct exec new_hdr;
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284 struct stat old_buf;
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285 /* some process specific "constants" */
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286 unsigned long n_pagsiz;
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287 caddr_t dynamic_beg;
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288 caddr_t current_break = (caddr_t) sbrk (0);
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289
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290 /* dynamically linked image? -- if so, find dld.sl structures */
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291 if (dynamic_addr)
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292 {
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293 ld = (struct dynamic *) dynamic_addr;
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294 #ifdef DEBUG
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295 printf ("dl_text = %#x\n", ld->text);
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296 printf ("dl_data = %#x\n", ld->data);
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297 printf ("dl_bss = %#x\n", ld->bss);
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298 printf ("dl_end = %#x\n", ld->end);
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299 printf ("dl_dmodule = %#x\n", ld->dmodule);
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300 printf ("dl_dlt = %#x\n", ld->dlt);
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301 printf ("dl_plt = %#x\n", ld->plt);
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302 #endif
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303 }
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304
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305 /* open the old and new files, figuring out how big the old one is
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306 so that we can map it in */
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307 old_fd = unexec_open (old_name, O_RDONLY, 0);
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308 new_fd = unexec_open (new_name, O_RDWR | O_CREAT | O_TRUNC, 0666);
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309
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310 /* setup the header and the statbuf for old_fd */
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311 unexec_read (old_fd, 0, (char *) &old_hdr, sizeof (old_hdr));
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312 unexec_fstat (old_fd, &old_buf);
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313
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314 /* set up some important constants */
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315 n_pagsiz = EXEC_PAGESIZE;
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316
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317 /* setup beginning of data to copy from executable */
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318 if (ld)
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319 dynamic_beg = ld->dmodule;
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320 else
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321 dynamic_beg = (caddr_t)EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data;
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322
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323 /* set up the new exec */
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324 new_hdr = old_hdr;
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325 new_hdr.a_text = MASK_DOWN (emacs_edata, n_pagsiz);
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326 new_hdr.a_data = MASK_UP (current_break, n_pagsiz)
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327 - EXEC_ALIGN(new_hdr.a_text);
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328 new_hdr.a_bss = 0;
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329
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330 #ifdef DEBUG
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331 printf ("old text %#x\n", old_hdr.a_text);
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332 printf ("new text %#x\n", new_hdr.a_text);
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333 printf ("old data %#x\n", old_hdr.a_data);
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334 printf ("new data %#x\n", new_hdr.a_data);
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335 printf ("old bss %#x\n", old_hdr.a_bss);
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336 printf ("new bss %#x\n", new_hdr.a_bss);
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337 #endif
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338
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339 /* set up this variable, in case we want to reset "the break"
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340 when restarting */
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341 sbrk_of_0_at_unexec = ((unsigned long) MASK_UP (current_break, n_pagsiz));
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342
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343 /* Write out the first approximation to the new file. The sizes of
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344 each section will be correct, but there will be a number of
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345 corrections that will need to be made. */
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346 {
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347 long old_datoff = DATA_OFFSET (old_hdr);
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348 long new_datoff = DATA_OFFSET (new_hdr);
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349 long old_dataddr = EXEC_ALIGN (old_hdr.a_text);
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350 long new_dataddr = EXEC_ALIGN (new_hdr.a_text);
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351 long new_mcaloff = MODCAL_OFFSET (new_hdr);
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352 long old_mcaloff = MODCAL_OFFSET (old_hdr);
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353 long newtext_size = new_hdr.a_text - old_dataddr;
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354 long newdata1_size = (unsigned long)dynamic_beg - new_dataddr;
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355 long dyn_size = (EXEC_ALIGN (old_hdr.a_text) + old_hdr.a_data)
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356 - (unsigned long)dynamic_beg;
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357 long newdata2_size = (unsigned long)current_break
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358 - ((unsigned long)dynamic_beg + dyn_size);
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359 long pad_size =
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360 MASK_UP (current_break, n_pagsiz) - ((unsigned long) current_break);
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361
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362 #ifdef DEBUG
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363 printf ("current break is %#lx\n", current_break);
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364
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365 printf ("old_dataddr = %#lx, dynamic_beg = %#lx\n",
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366 old_dataddr, dynamic_beg);
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367 #endif
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368
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369 /*
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370 * First, write the text segment with new header -- copy
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371 * everything until the start of the data segment from the old
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372 * file
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373 */
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374 #ifdef DEBUG
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375 printf ("copying %#lx bytes of text from 0\n", old_datoff);
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376 #endif
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377 unexec_copy (new_fd, old_fd, 0, 0, old_datoff);
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378 /* pad out the text segment */
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379 #ifdef DEBUG
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380 printf ( "text pad size is %#x\n", old_dataddr - old_hdr.a_text);
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381 #endif
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382 unexec_pad (new_fd, old_dataddr - old_hdr.a_text);
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383
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384 /*
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385 * go back and write the new header.
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386 */
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387 unexec_write (new_fd, 0, (char *) &new_hdr, sizeof (new_hdr));
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388
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389
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390 /*
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391 * Copy the part of the data segment which becomes text from the
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392 * running image.
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393 */
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394 #ifdef DEBUG
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395 printf ("copying %#lx bytes of new text from %#lx to position %#lx\n",
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396 newtext_size, old_dataddr, TEXT_OFFSET(new_hdr) + old_dataddr);
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397 #endif
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398 unexec_write (new_fd, TEXT_OFFSET(new_hdr) + old_dataddr,
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399 (caddr_t)old_dataddr, newtext_size);
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400
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401 #ifdef DEBUG
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402 printf ("new DATA_OFFSET is %#lx\n", new_datoff);
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403 #endif
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404
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405 /*
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406 * Copy the part of the old data segment which will be data
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407 * in the new executable (before the dynamic stuff)
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408 * from the running image.
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409 */
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410 #ifdef DEBUG
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411 printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
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412 newdata1_size, new_dataddr, new_datoff);
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413 #endif
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414 unexec_write (new_fd, new_datoff, (caddr_t)new_dataddr, newdata1_size);
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415
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416 /* copy the dynamic part of the data segment from the old executable */
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417 if (dyn_size)
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418 {
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419 #ifdef DEBUG
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420 printf ("copying %#lx bytes of dyn data from executable"
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421 " at address %#lx to position %#lx\n",
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422 dyn_size, dynamic_beg, new_datoff + newdata1_size);
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423 #endif
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424 unexec_copy (new_fd, old_fd, old_datoff + newtext_size + newdata1_size,
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425 new_datoff + newdata1_size, dyn_size);
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426 }
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427
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428 /* copy remaining data (old bss) from the running image */
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429 #ifdef DEBUG
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430 printf ("copying %#lx bytes of data from %#lx to position %#lx\n",
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431 newdata2_size, new_dataddr + newdata1_size + dyn_size,
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432 new_datoff + newdata1_size + dyn_size);
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433 #endif
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434 unexec_write (new_fd, new_datoff + newdata1_size + dyn_size,
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435 (caddr_t)(new_dataddr + newdata1_size + dyn_size),
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436 newdata2_size);
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437
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438 /* pad out the data segment */
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439 #ifdef DEBUG
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440 printf ( "pad size is %#x\n", pad_size);
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441 #endif
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442 unexec_pad (new_fd, pad_size);
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443
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444 /* Finally, copy the rest of the junk from the old file. */
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445 #ifdef DEBUG
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446 printf ("Copying %#lx bytes of junk from %#lx (old) to %#lx (new)\n",
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447 old_buf.st_size - old_mcaloff, old_mcaloff, new_mcaloff);
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448 #endif
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449 unexec_copy (new_fd, old_fd, old_mcaloff, new_mcaloff,
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450 old_buf.st_size - old_mcaloff);
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451 }
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452
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453
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454 /* make the output file executable -- then quit */
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455 unexec_fchmod (new_fd, 0755);
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456 close (old_fd);
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457 close (new_fd);
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458 return 0;
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459 }
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460
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461
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462 int
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463 run_time_remap (char *dummy)
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464 {
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465 unsigned long current_sbrk = (unsigned long) sbrk (0);
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466
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467 if (sbrk_of_0_at_unexec < current_sbrk)
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468 fprintf (stderr, "Absurd new brk addr = 0x%x (current = 0x%x)\n",
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469 sbrk_of_0_at_unexec, current_sbrk);
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470 else
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471 {
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472 errno = 0;
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473 if (brk ((caddr_t) sbrk_of_0_at_unexec))
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474 fprintf (stderr, "failed to change brk addr to 0x%x: %s\n",
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475 sbrk_of_0_at_unexec, SYS_ERR);
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476 }
|
|
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477
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478 return 0;
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|
|
479 }
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