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428
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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994
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771
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2 /* Copyright (C) 2001 Ben Wing.
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428
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3 Free Software Foundation, Inc.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.31. */
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23
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24 /*
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25 * unexec.c - Convert a running program into an a.out file.
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26 *
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27 * Author: Spencer W. Thomas
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28 * Computer Science Dept.
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29 * University of Utah
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30 * Date: Tue Mar 2 1982
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31 * Modified heavily since then.
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32 *
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33 * Synopsis:
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34 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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35 * char *new_name, *a_name;
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36 * unsigned data_start, bss_start, entry_address;
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37 *
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38 * Takes a snapshot of the program and makes an a.out format file in the
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39 * file named by the string argument new_name.
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40 * If a_name is non-NULL, the symbol table will be taken from the given file.
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41 * On some machines, an existing a_name file is required.
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42 *
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43 * The boundaries within the a.out file may be adjusted with the data_start
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44 * and bss_start arguments. Either or both may be given as 0 for defaults.
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45 *
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46 * Data_start gives the boundary between the text segment and the data
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47 * segment of the program. The text segment can contain shared, read-only
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48 * program code and literal data, while the data segment is always unshared
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49 * and unprotected. Data_start gives the lowest unprotected address.
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50 * The value you specify may be rounded down to a suitable boundary
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51 * as required by the machine you are using.
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52 *
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53 * Specifying zero for data_start means the boundary between text and data
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54 * should not be the same as when the program was loaded.
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55 * If NO_REMAP is defined, the argument data_start is ignored and the
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56 * segment boundaries are never changed.
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57 *
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58 * Bss_start indicates how much of the data segment is to be saved in the
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59 * a.out file and restored when the program is executed. It gives the lowest
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60 * unsaved address, and is rounded up to a page boundary. The default when 0
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61 * is given assumes that the entire data segment is to be stored, including
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62 * the previous data and bss as well as any additional storage allocated with
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63 * break (2).
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64 *
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65 * The new file is set up to start at entry_address.
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66 *
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67 * If you make improvements I'd like to get them too.
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68 * harpo!utah-cs!thomas, thomas@Utah-20
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69 *
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70 */
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71
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72 /* Modified to support SysVr3 shared libraries by James Van Artsdalen
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73 * of Dell Computer Corporation. james@bigtex.cactus.org.
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74 */
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75
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76 /* There are several compilation parameters affecting unexec:
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77
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78 * COFF
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79
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80 Define this if your system uses COFF for executables.
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81
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82 * COFF_ENCAPSULATE
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83
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84 Define this if you are using the GNU coff encapsulated a.out format.
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85 This is closer to a.out than COFF. You should *not* define COFF if
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86 you define COFF_ENCAPSULATE
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87
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88 Otherwise we assume you use Berkeley format.
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89
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90 * NO_REMAP
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91
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92 Define this if you do not want to try to save Emacs's pure data areas
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93 as part of the text segment.
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94
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95 Saving them as text is good because it allows users to share more.
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96
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97 However, on machines that locate the text area far from the data area,
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98 the boundary cannot feasibly be moved. Such machines require
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99 NO_REMAP.
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100
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101 Also, remapping can cause trouble with the built-in startup routine
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102 /lib/crt0.o, which defines `environ' as an initialized variable.
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103 Dumping `environ' as pure does not work! So, to use remapping,
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104 you must write a startup routine for your machine in Emacs's crt0.c.
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105 If NO_REMAP is defined, Emacs uses the system's crt0.o.
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106
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107 * SECTION_ALIGNMENT
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108
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109 Some machines that use COFF executables require that each section
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110 start on a certain boundary *in the COFF file*. Such machines should
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111 define SECTION_ALIGNMENT to a mask of the low-order bits that must be
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112 zero on such a boundary. This mask is used to control padding between
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113 segments in the COFF file.
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114
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115 If SECTION_ALIGNMENT is not defined, the segments are written
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116 consecutively with no attempt at alignment. This is right for
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117 unmodified system V.
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118
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119 * SEGMENT_MASK
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120
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121 Some machines require that the beginnings and ends of segments
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122 *in core* be on certain boundaries. For most machines, a page
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123 boundary is sufficient. That is the default. When a larger
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124 boundary is needed, define SEGMENT_MASK to a mask of
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125 the bits that must be zero on such a boundary.
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126
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127 * A_TEXT_OFFSET(HDR)
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128
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129 Some machines count the a.out header as part of the size of the text
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130 segment (a_text); they may actually load the header into core as the
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131 first data in the text segment. Some have additional padding between
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132 the header and the real text of the program that is counted in a_text.
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133
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134 For these machines, define A_TEXT_OFFSET(HDR) to examine the header
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135 structure HDR and return the number of bytes to add to `a_text'
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136 before writing it (above and beyond the number of bytes of actual
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137 program text). HDR's standard fields are already correct, except that
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138 this adjustment to the `a_text' field has not yet been made;
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139 thus, the amount of offset can depend on the data in the file.
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438
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140
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428
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141 * A_TEXT_SEEK(HDR)
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142
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143 If defined, this macro specifies the number of bytes to seek into the
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144 a.out file before starting to write the text segment.
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145
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146 * EXEC_MAGIC
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147
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148 For machines using COFF, this macro, if defined, is a value stored
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149 into the magic number field of the output file.
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150
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151 * ADJUST_EXEC_HEADER
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152
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153 This macro can be used to generate statements to adjust or
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154 initialize nonstandard fields in the file header
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155
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156 * ADDR_CORRECT(ADDR)
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157
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158 Macro to correct an int which is the bit pattern of a pointer to a byte
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159 into an int which is the number of a byte.
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160
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161 This macro has a default definition which is usually right.
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162 This default definition is a no-op on most machines (where a
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163 pointer looks like an int) but not on all machines.
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164
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165 */
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166
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167 #ifndef emacs
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168 #define PERROR(arg) perror (arg); return -1
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169 #else
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170 #define IN_UNEXEC
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171 #include <config.h>
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3025
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172 #define PERROR(file) report_error (file, new_)
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428
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173 #endif
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174
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175 #if __STDC__ || defined(STDC_HEADERS)
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176
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177 /* I don't know how correct this attempt to get more prototypes is... */
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178 # if defined(sun) && defined(_POSIX_SOURCE)
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179 # undef _POSIX_SOURCE
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180 # endif
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181
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182 # include <stddef.h>
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183 # include <stdlib.h>
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184 # include <unistd.h>
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185 # include <string.h>
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186 # include <stddef.h>
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438
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187 # include <errno.h>
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428
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188
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189 #endif
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190
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191 /* I don't understand this, but it's necessary to get some slots in struct exec
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192 from /usr/include/sys/exec.h when running LCC in strict ANSI mode. We don't
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193 need this in K&R mode...
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194 */
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195 #if defined(__lucid) && defined(__sparc) && !defined(sun)
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196 # define sun 1
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197 #endif
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198
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199 #ifdef COFF_ENCAPSULATE
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200 int need_coff_header = 1;
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201 #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
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202 #else
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203 #include <a.out.h>
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204 #endif /* not COFF_ENCAPSULATE */
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205
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206 /* Define getpagesize if the system does not.
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207 Note that this may depend on symbols defined in a.out.h. */
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208 #include "getpagesize.h"
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209
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210 #ifndef makedev /* Try to detect types.h already loaded */
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211 #include <sys/types.h>
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212 #endif /* makedev */
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213 #include <stdio.h>
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214 #include <sys/stat.h>
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215 #include <errno.h>
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216
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217 #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
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218
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219 #ifdef USG5
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220 #include <fcntl.h>
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221 #endif
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222
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2286
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223 #include "compiler.h"
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224
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428
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225 #ifndef O_RDONLY
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226 #define O_RDONLY 0
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227 #endif
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228 #ifndef O_RDWR
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229 #define O_RDWR 2
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230 #endif
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231
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232 extern char *start_of_text (); /* Start of text */
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233
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234 extern void *start_of_data (); /* Start of initialized data */
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235
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236 #ifdef COFF
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237 static long block_copy_start; /* Old executable start point */
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238 static struct filehdr f_hdr; /* File header */
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239 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
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240 long bias; /* Bias to add for growth */
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241 long lnnoptr; /* Pointer to line-number info within file */
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242 #define SYMS_START block_copy_start
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243
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244 static long text_scnptr;
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245 static long data_scnptr;
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246
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247 #else /* not COFF */
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248
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249 #ifdef __STDC__
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250 #ifndef __sys_stdtypes_h
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251 #if !defined(_PTRDIFF_T) && !defined(_BSD_PTRDIFF_T_)
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252 typedef long ptrdiff_t;
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253 #endif
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254 #endif
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255 #ifndef HPUX
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256 /* not sure where this for NetBSD should really go
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257 and it probably applies to other systems */
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258 #if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__)
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259 extern void *sbrk (ptrdiff_t);
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260 #else
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261 extern char *sbrk ();
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262 #endif /* __NetBSD__ or __OpenBSD__ */
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263 #endif /* HPUX */
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264 #else
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265 extern void *sbrk ();
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266 #endif
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267
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268 #define SYMS_START ((long) N_SYMOFF (ohdr))
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269
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270 /* Some machines override the structure name for an a.out header. */
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271 #ifndef EXEC_HDR_TYPE
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272 #define EXEC_HDR_TYPE struct exec
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273 #endif
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274
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275 #ifdef HPUX
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276 #ifdef HP9000S200_ID
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277 #define MY_ID HP9000S200_ID
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278 #else
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279 #include <model.h>
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280 #define MY_ID MYSYS
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281 #endif /* no HP9000S200_ID */
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282 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
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283 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
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284 #define N_TXTOFF(x) TEXT_OFFSET(x)
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285 #define N_SYMOFF(x) LESYM_OFFSET(x)
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286 static EXEC_HDR_TYPE hdr, ohdr;
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287
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288 #else /* not HPUX */
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289
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290 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
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291 static struct bhdr hdr, ohdr;
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292 #define a_magic fmagic
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293 #define a_text tsize
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294 #define a_data dsize
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295 #define a_bss bsize
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296 #define a_syms ssize
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297 #define a_trsize rtsize
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298 #define a_drsize rdsize
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299 #define a_entry entry
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300 #define N_BADMAG(x) \
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301 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
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302 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
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303 #define NEWMAGIC FMAGIC
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304 #else /* IRIS or IBMAIX or not USG */
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305 static EXEC_HDR_TYPE hdr, ohdr;
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306 #define NEWMAGIC ZMAGIC
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307 #endif /* IRIS or IBMAIX not USG */
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|
308 #endif /* not HPUX */
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309
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310 static int unexec_text_start;
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311 static int unexec_data_start;
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312
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313 #ifdef COFF_ENCAPSULATE
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314 /* coffheader is defined in the GNU a.out.encap.h file. */
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315 struct coffheader coffheader;
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316 #endif
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317
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318 #endif /* not COFF */
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319
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320 static int pagemask;
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321
|
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322 /* Correct an int which is the bit pattern of a pointer to a byte
|
|
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323 into an int which is the number of a byte.
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324 This is a no-op on ordinary machines, but not on all. */
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325
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|
|
326 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
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327 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
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|
|
328 #endif
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|
329
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|
|
330 #ifdef emacs
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331
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|
332 #include "lisp.h"
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333
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|
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334 static void
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440
|
335 report_error (const char *file, int fd)
|
|
428
|
336 {
|
|
|
337 if (fd)
|
|
|
338 close (fd);
|
|
563
|
339 report_error_with_errno (Qio_error, "Cannot unexec",
|
|
|
340 build_ext_string (file, Qfile_name));
|
|
428
|
341 }
|
|
|
342 #endif /* emacs */
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|
|
343
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3025
|
344 #define ERROR0(msg) report_error_1 (new_, msg, 0, 0); return -1
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|
|
345 #define ERROR1(msg,x) report_error_1 (new_, msg, x, 0); return -1
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|
|
346 #define ERROR2(msg,x,y) report_error_1 (new_, msg, x, y); return -1
|
|
428
|
347
|
|
|
348 static void
|
|
|
349 report_error_1 (fd, msg, a1, a2)
|
|
|
350 int fd;
|
|
442
|
351 const char *msg;
|
|
428
|
352 int a1, a2;
|
|
|
353 {
|
|
|
354 close (fd);
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|
|
355 #ifdef emacs
|
|
563
|
356 signal_ferror (Qio_error, msg, a1, a2);
|
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428
|
357 #else
|
|
|
358 fprintf (stderr, msg, a1, a2);
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|
|
359 fprintf (stderr, "\n");
|
|
|
360 #endif
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|
|
361 }
|
|
|
362
|
|
3025
|
363 static int make_hdr (int new_, int a_out, unsigned data_start,
|
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428
|
364 unsigned bss_start, unsigned entry_address,
|
|
|
365 char *a_name, char *new_name);
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|
3025
|
366 static int copy_text_and_data (int new_, int a_out);
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|
|
367 static int copy_sym (int new_, int a_out, char *a_name, char *new_name);
|
|
428
|
368 static void mark_x (char *name);
|
|
|
369
|
|
|
370 /* ****************************************************************
|
|
|
371 * unexec
|
|
|
372 *
|
|
|
373 * driving logic.
|
|
|
374 */
|
|
|
375 int
|
|
|
376 unexec (new_name, a_name, data_start, bss_start, entry_address)
|
|
|
377 char *new_name, *a_name;
|
|
|
378 unsigned data_start, bss_start, entry_address;
|
|
|
379 {
|
|
3025
|
380 int new_, a_out = -1;
|
|
428
|
381
|
|
|
382 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
|
|
|
383 {
|
|
|
384 PERROR (a_name);
|
|
|
385 }
|
|
3025
|
386 if ((new_ = creat (new_name, 0666)) < 0)
|
|
428
|
387 {
|
|
|
388 PERROR (new_name);
|
|
|
389 }
|
|
|
390
|
|
3025
|
391 if (make_hdr (new_, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
|
|
|
392 || copy_text_and_data (new_, a_out) < 0
|
|
|
393 || copy_sym (new_, a_out, a_name, new_name) < 0
|
|
428
|
394 #ifdef COFF
|
|
|
395 #ifndef COFF_BSD_SYMBOLS
|
|
3025
|
396 || adjust_lnnoptrs (new_, a_out, new_name) < 0
|
|
428
|
397 #endif
|
|
|
398 #endif
|
|
|
399 )
|
|
|
400 {
|
|
3025
|
401 close (new_);
|
|
428
|
402 /* unlink (new_name); / * Failed, unlink new a.out */
|
|
438
|
403 return -1;
|
|
428
|
404 }
|
|
|
405
|
|
3025
|
406 close (new_);
|
|
428
|
407 if (a_out >= 0)
|
|
|
408 close (a_out);
|
|
|
409 mark_x (new_name);
|
|
|
410 return 0;
|
|
|
411 }
|
|
|
412
|
|
|
413 /* ****************************************************************
|
|
|
414 * make_hdr
|
|
|
415 *
|
|
|
416 * Make the header in the new a.out from the header in core.
|
|
|
417 * Modify the text and data sizes.
|
|
|
418 */
|
|
|
419 static int
|
|
3025
|
420 make_hdr (int new_, int a_out, unsigned data_start, unsigned bss_start,
|
|
428
|
421 unsigned entry_address, char *a_name, char *new_name)
|
|
|
422 {
|
|
|
423 #ifdef COFF
|
|
|
424 auto struct scnhdr f_thdr; /* Text section header */
|
|
|
425 auto struct scnhdr f_dhdr; /* Data section header */
|
|
|
426 auto struct scnhdr f_bhdr; /* Bss section header */
|
|
|
427 auto struct scnhdr scntemp; /* Temporary section header */
|
|
|
428 int scns;
|
|
|
429 #endif /* COFF */
|
|
|
430 #ifdef USG_SHARED_LIBRARIES
|
|
|
431 extern unsigned int bss_end;
|
|
|
432 #else
|
|
|
433 unsigned int bss_end;
|
|
|
434 #endif
|
|
|
435
|
|
|
436 pagemask = getpagesize () - 1;
|
|
|
437
|
|
|
438 /* Adjust text/data boundary. */
|
|
|
439 #ifdef NO_REMAP
|
|
|
440 data_start = (int) start_of_data ();
|
|
|
441 #else /* not NO_REMAP */
|
|
|
442 if (!data_start)
|
|
|
443 data_start = (int) start_of_data ();
|
|
|
444 #endif /* not NO_REMAP */
|
|
|
445 data_start = ADDR_CORRECT (data_start);
|
|
|
446
|
|
|
447 #ifdef SEGMENT_MASK
|
|
|
448 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
|
|
|
449 #else
|
|
|
450 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
|
|
|
451 #endif
|
|
|
452
|
|
|
453 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
|
|
|
454 bss_end &= ~ pagemask;
|
|
|
455
|
|
|
456 /* Adjust data/bss boundary. */
|
|
|
457 if (bss_start != 0)
|
|
|
458 {
|
|
|
459 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
|
|
|
460 /* (Up) to page bdry. */
|
|
|
461 bss_start &= ~ pagemask;
|
|
|
462 if (bss_start > bss_end)
|
|
|
463 {
|
|
|
464 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
|
|
|
465 bss_start);
|
|
|
466 }
|
|
|
467 }
|
|
|
468 else
|
|
|
469 bss_start = bss_end;
|
|
|
470
|
|
|
471 if (data_start > bss_start) /* Can't have negative data size. */
|
|
|
472 {
|
|
|
473 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
|
|
|
474 data_start, bss_start);
|
|
|
475 }
|
|
|
476
|
|
|
477 #ifdef COFF
|
|
|
478 /* Salvage as much info from the existing file as possible */
|
|
|
479 if (a_out >= 0)
|
|
|
480 {
|
|
|
481 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
482 {
|
|
|
483 PERROR (a_name);
|
|
|
484 }
|
|
|
485 block_copy_start += sizeof (f_hdr);
|
|
|
486 if (f_hdr.f_opthdr > 0)
|
|
|
487 {
|
|
|
488 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
489 {
|
|
|
490 PERROR (a_name);
|
|
|
491 }
|
|
|
492 block_copy_start += sizeof (f_ohdr);
|
|
|
493 }
|
|
|
494 /* Loop through section headers, copying them in */
|
|
|
495 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
496 for (scns = f_hdr.f_nscns; scns > 0; scns--) {
|
|
|
497 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
498 {
|
|
|
499 PERROR (a_name);
|
|
|
500 }
|
|
|
501 if (scntemp.s_scnptr > 0L)
|
|
|
502 {
|
|
|
503 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
|
|
|
504 block_copy_start = scntemp.s_scnptr + scntemp.s_size;
|
|
|
505 }
|
|
|
506 if (strcmp (scntemp.s_name, ".text") == 0)
|
|
|
507 {
|
|
|
508 f_thdr = scntemp;
|
|
|
509 }
|
|
|
510 else if (strcmp (scntemp.s_name, ".data") == 0)
|
|
|
511 {
|
|
|
512 f_dhdr = scntemp;
|
|
|
513 }
|
|
|
514 else if (strcmp (scntemp.s_name, ".bss") == 0)
|
|
|
515 {
|
|
|
516 f_bhdr = scntemp;
|
|
|
517 }
|
|
|
518 }
|
|
|
519 }
|
|
|
520 else
|
|
|
521 {
|
|
|
522 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
523 }
|
|
|
524
|
|
|
525 /* Now we alter the contents of all the f_*hdr variables
|
|
|
526 to correspond to what we want to dump. */
|
|
|
527
|
|
|
528 #ifdef USG_SHARED_LIBRARIES
|
|
|
529
|
|
|
530 /* The amount of data we're adding to the file is distance from the
|
|
|
531 * end of the original .data space to the current end of the .data
|
|
|
532 * space.
|
|
|
533 */
|
|
|
534
|
|
|
535 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size);
|
|
|
536
|
|
|
537 #endif
|
|
|
538
|
|
|
539 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
|
|
|
540 #ifdef TPIX
|
|
|
541 f_hdr.f_nscns = 3;
|
|
|
542 #endif
|
|
|
543 #ifdef EXEC_MAGIC
|
|
|
544 f_ohdr.magic = EXEC_MAGIC;
|
|
|
545 #endif
|
|
|
546 #ifndef NO_REMAP
|
|
|
547 f_ohdr.text_start = (long) start_of_text ();
|
|
|
548 f_ohdr.tsize = data_start - f_ohdr.text_start;
|
|
|
549 f_ohdr.data_start = data_start;
|
|
|
550 #endif /* NO_REMAP */
|
|
|
551 f_ohdr.dsize = bss_start - f_ohdr.data_start;
|
|
|
552 f_ohdr.bsize = bss_end - bss_start;
|
|
|
553 #ifndef KEEP_OLD_TEXT_SCNPTR
|
|
|
554 /* On some machines, the old values are right.
|
|
|
555 ??? Maybe on all machines with NO_REMAP. */
|
|
|
556 f_thdr.s_size = f_ohdr.tsize;
|
|
|
557 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
|
|
|
558 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
559 #endif /* KEEP_OLD_TEXT_SCNPTR */
|
|
|
560 #ifdef ADJUST_TEXT_SCNHDR_SIZE
|
|
|
561 /* On some machines, `text size' includes all headers. */
|
|
|
562 f_thdr.s_size -= f_thdr.s_scnptr;
|
|
|
563 #endif /* ADJUST_TEST_SCNHDR_SIZE */
|
|
|
564 lnnoptr = f_thdr.s_lnnoptr;
|
|
|
565 #ifdef SECTION_ALIGNMENT
|
|
|
566 /* Some systems require special alignment
|
|
|
567 of the sections in the file itself. */
|
|
|
568 f_thdr.s_scnptr
|
|
|
569 = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
570 #endif /* SECTION_ALIGNMENT */
|
|
|
571 #ifdef TPIX
|
|
|
572 f_thdr.s_scnptr = 0xd0;
|
|
|
573 #endif
|
|
|
574 text_scnptr = f_thdr.s_scnptr;
|
|
|
575 #ifdef ADJUST_TEXTBASE
|
|
|
576 text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
577 #endif
|
|
|
578 #ifndef KEEP_OLD_PADDR
|
|
|
579 f_dhdr.s_paddr = f_ohdr.data_start;
|
|
|
580 #endif /* KEEP_OLD_PADDR */
|
|
|
581 f_dhdr.s_vaddr = f_ohdr.data_start;
|
|
|
582 f_dhdr.s_size = f_ohdr.dsize;
|
|
|
583 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
|
|
|
584 #ifdef SECTION_ALIGNMENT
|
|
|
585 /* Some systems require special alignment
|
|
|
586 of the sections in the file itself. */
|
|
|
587 f_dhdr.s_scnptr
|
|
|
588 = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
589 #endif /* SECTION_ALIGNMENT */
|
|
|
590 #ifdef DATA_SECTION_ALIGNMENT
|
|
|
591 /* Some systems require special alignment
|
|
|
592 of the data section only. */
|
|
|
593 f_dhdr.s_scnptr
|
|
|
594 = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
|
|
|
595 #endif /* DATA_SECTION_ALIGNMENT */
|
|
|
596 data_scnptr = f_dhdr.s_scnptr;
|
|
|
597 #ifndef KEEP_OLD_PADDR
|
|
|
598 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
599 #endif /* KEEP_OLD_PADDR */
|
|
|
600 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
601 f_bhdr.s_size = f_ohdr.bsize;
|
|
|
602 f_bhdr.s_scnptr = 0L;
|
|
|
603 #ifndef USG_SHARED_LIBRARIES
|
|
|
604 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
|
|
|
605 #endif
|
|
|
606
|
|
|
607 if (f_hdr.f_symptr > 0L)
|
|
|
608 {
|
|
|
609 f_hdr.f_symptr += bias;
|
|
|
610 }
|
|
|
611
|
|
|
612 if (f_thdr.s_lnnoptr > 0L)
|
|
|
613 {
|
|
|
614 f_thdr.s_lnnoptr += bias;
|
|
|
615 }
|
|
|
616
|
|
|
617 #ifdef ADJUST_EXEC_HEADER
|
|
|
618 ADJUST_EXEC_HEADER;
|
|
|
619 #endif /* ADJUST_EXEC_HEADER */
|
|
|
620
|
|
3025
|
621 if (write (new_, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
428
|
622 {
|
|
|
623 PERROR (new_name);
|
|
|
624 }
|
|
|
625
|
|
3025
|
626 if (write (new_, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
428
|
627 {
|
|
|
628 PERROR (new_name);
|
|
|
629 }
|
|
|
630
|
|
|
631 #ifndef USG_SHARED_LIBRARIES
|
|
|
632
|
|
3025
|
633 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
428
|
634 {
|
|
|
635 PERROR (new_name);
|
|
|
636 }
|
|
|
637
|
|
3025
|
638 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
428
|
639 {
|
|
|
640 PERROR (new_name);
|
|
|
641 }
|
|
|
642
|
|
3025
|
643 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
428
|
644 {
|
|
|
645 PERROR (new_name);
|
|
|
646 }
|
|
|
647
|
|
|
648 #else /* USG_SHARED_LIBRARIES */
|
|
|
649
|
|
|
650 /* The purpose of this code is to write out the new file's section
|
|
|
651 * header table.
|
|
|
652 *
|
|
|
653 * Scan through the original file's sections. If the encountered
|
|
|
654 * section is one we know (.text, .data or .bss), write out the
|
|
|
655 * correct header. If it is a section we do not know (such as
|
|
|
656 * .lib), adjust the address of where the section data is in the
|
|
|
657 * file, and write out the header.
|
|
|
658 *
|
|
|
659 * If any section precedes .text or .data in the file, this code
|
|
|
660 * will not adjust the file pointer for that section correctly.
|
|
|
661 */
|
|
|
662
|
|
|
663 /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
|
|
|
664 .f_opthdr is said to be right when there is no optional header. */
|
|
|
665 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
666
|
|
|
667 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
668 {
|
|
|
669 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
670 PERROR (a_name);
|
|
|
671
|
|
|
672 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */
|
|
|
673 {
|
|
3025
|
674 if (write (new_, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
428
|
675 PERROR (new_name);
|
|
|
676 }
|
|
|
677 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */
|
|
|
678 {
|
|
3025
|
679 if (write (new_, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
428
|
680 PERROR (new_name);
|
|
|
681 }
|
|
|
682 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */
|
|
|
683 {
|
|
3025
|
684 if (write (new_, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
428
|
685 PERROR (new_name);
|
|
|
686 }
|
|
|
687 else
|
|
|
688 {
|
|
|
689 if (scntemp.s_scnptr)
|
|
|
690 scntemp.s_scnptr += bias;
|
|
3025
|
691 if (write (new_, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
428
|
692 PERROR (new_name);
|
|
|
693 }
|
|
|
694 }
|
|
|
695 #endif /* USG_SHARED_LIBRARIES */
|
|
|
696
|
|
|
697 return (0);
|
|
|
698
|
|
|
699 #else /* if not COFF */
|
|
|
700
|
|
|
701 /* Get symbol table info from header of a.out file if given one. */
|
|
|
702 if (a_out >= 0)
|
|
|
703 {
|
|
|
704 #ifdef COFF_ENCAPSULATE
|
|
647
|
705 if (read (a_out, &coffheader, sizeof (coffheader)) != sizeof (coffheader))
|
|
428
|
706 {
|
|
|
707 PERROR(a_name);
|
|
|
708 }
|
|
|
709 if (coffheader.f_magic != COFF_MAGIC)
|
|
|
710 {
|
|
|
711 ERROR1("%s doesn't have legal coff magic number\n", a_name);
|
|
|
712 }
|
|
|
713 #endif
|
|
647
|
714 if (read (a_out, (char *) &ohdr, sizeof (hdr)) != sizeof (hdr))
|
|
428
|
715 {
|
|
|
716 PERROR (a_name);
|
|
|
717 }
|
|
|
718
|
|
|
719 if (N_BADMAG (ohdr))
|
|
|
720 {
|
|
|
721 ERROR1 ("invalid magic number in %s", a_name);
|
|
|
722 }
|
|
|
723 hdr = ohdr;
|
|
|
724 }
|
|
|
725 else
|
|
|
726 {
|
|
|
727 #ifdef COFF_ENCAPSULATE
|
|
|
728 /* We probably could without too much trouble. The code is in gld
|
|
|
729 * but I don't have that much time or incentive.
|
|
|
730 */
|
|
|
731 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
732 #else
|
|
647
|
733 memset ((void *)&hdr, 0, sizeof (hdr));
|
|
428
|
734 #endif
|
|
|
735 }
|
|
|
736
|
|
|
737 unexec_text_start = (long) start_of_text ();
|
|
|
738 unexec_data_start = data_start;
|
|
|
739
|
|
|
740 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
|
|
|
741 #ifdef ADJUST_EXEC_HEADER
|
|
|
742 ADJUST_EXEC_HEADER;
|
|
|
743 #endif /* ADJUST_EXEC_HEADER */
|
|
|
744
|
|
|
745 hdr.a_trsize = 0;
|
|
|
746 hdr.a_drsize = 0;
|
|
|
747 if (entry_address != 0)
|
|
|
748 hdr.a_entry = entry_address;
|
|
|
749
|
|
|
750 hdr.a_bss = bss_end - bss_start;
|
|
|
751 hdr.a_data = bss_start - data_start;
|
|
|
752 #ifdef NO_REMAP
|
|
|
753 hdr.a_text = ohdr.a_text;
|
|
|
754 #else /* not NO_REMAP */
|
|
|
755 hdr.a_text = data_start - unexec_text_start;
|
|
|
756
|
|
|
757 #ifdef A_TEXT_OFFSET
|
|
|
758 hdr.a_text += A_TEXT_OFFSET (ohdr);
|
|
|
759 #endif
|
|
|
760
|
|
|
761 #endif /* not NO_REMAP */
|
|
|
762
|
|
|
763 #ifdef COFF_ENCAPSULATE
|
|
|
764 /* We are encapsulating BSD format within COFF format. */
|
|
|
765 {
|
|
|
766 struct coffscn *tp, *dp, *bp;
|
|
|
767 tp = &coffheader.scns[0];
|
|
|
768 dp = &coffheader.scns[1];
|
|
|
769 bp = &coffheader.scns[2];
|
|
|
770 tp->s_size = hdr.a_text + sizeof(struct exec);
|
|
|
771 dp->s_paddr = data_start;
|
|
|
772 dp->s_vaddr = data_start;
|
|
|
773 dp->s_size = hdr.a_data;
|
|
|
774 bp->s_paddr = dp->s_vaddr + dp->s_size;
|
|
|
775 bp->s_vaddr = bp->s_paddr;
|
|
|
776 bp->s_size = hdr.a_bss;
|
|
|
777 coffheader.tsize = tp->s_size;
|
|
|
778 coffheader.dsize = dp->s_size;
|
|
|
779 coffheader.bsize = bp->s_size;
|
|
|
780 coffheader.text_start = tp->s_vaddr;
|
|
|
781 coffheader.data_start = dp->s_vaddr;
|
|
|
782 }
|
|
3025
|
783 if (write (new_, &coffheader, sizeof (coffheader)) != sizeof (coffheader))
|
|
428
|
784 {
|
|
|
785 PERROR(new_name);
|
|
|
786 }
|
|
|
787 #endif /* COFF_ENCAPSULATE */
|
|
|
788
|
|
3025
|
789 if (write (new_, (char *) &hdr, sizeof (hdr)) != sizeof (hdr))
|
|
428
|
790 {
|
|
|
791 PERROR (new_name);
|
|
|
792 }
|
|
|
793
|
|
|
794 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
|
|
|
795 /* This adjustment was done above only #ifndef NO_REMAP,
|
|
|
796 so only undo it now #ifndef NO_REMAP. */
|
|
|
797 /* #ifndef NO_REMAP */
|
|
|
798 #endif
|
|
|
799 #ifdef A_TEXT_OFFSET
|
|
|
800 hdr.a_text -= A_TEXT_OFFSET (ohdr);
|
|
|
801 #endif
|
|
|
802
|
|
|
803 return 0;
|
|
|
804
|
|
|
805 #endif /* not COFF */
|
|
|
806 }
|
|
|
807
|
|
|
808 static void write_segment (int, char *, char *);
|
|
|
809
|
|
|
810 /* ****************************************************************
|
|
|
811 * copy_text_and_data
|
|
|
812 *
|
|
|
813 * Copy the text and data segments from memory to the new a.out
|
|
|
814 */
|
|
|
815 static int
|
|
3025
|
816 copy_text_and_data (int new_,
|
|
2286
|
817 #if defined (COFF) && defined (USG_SHARED_LIBRARIES)
|
|
|
818 int a_out
|
|
|
819 #else
|
|
|
820 int UNUSED (a_out)
|
|
|
821 #endif
|
|
|
822 )
|
|
428
|
823 {
|
|
|
824 char *end;
|
|
|
825 char *ptr;
|
|
|
826
|
|
|
827 #ifdef COFF
|
|
|
828
|
|
|
829 #ifdef USG_SHARED_LIBRARIES
|
|
|
830
|
|
|
831 int scns;
|
|
|
832 struct scnhdr scntemp; /* Temporary section header */
|
|
|
833
|
|
|
834 /* The purpose of this code is to write out the new file's section
|
|
|
835 * contents.
|
|
|
836 *
|
|
|
837 * Step through the section table. If we know the section (.text,
|
|
|
838 * .data) do the appropriate thing. Otherwise, if the section has
|
|
|
839 * no allocated space in the file (.bss), do nothing. Otherwise,
|
|
|
840 * the section has space allocated in the file, and is not a section
|
|
|
841 * we know. So just copy it.
|
|
|
842 */
|
|
|
843
|
|
|
844 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0);
|
|
|
845
|
|
|
846 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
847 {
|
|
|
848 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
849 PERROR ("temacs");
|
|
|
850
|
|
|
851 if (!strcmp (scntemp.s_name, ".text"))
|
|
|
852 {
|
|
3025
|
853 lseek (new_, (long) text_scnptr, 0);
|
|
428
|
854 ptr = (char *) f_ohdr.text_start;
|
|
|
855 end = ptr + f_ohdr.tsize;
|
|
3025
|
856 write_segment (new_, ptr, end);
|
|
428
|
857 }
|
|
|
858 else if (!strcmp (scntemp.s_name, ".data"))
|
|
|
859 {
|
|
3025
|
860 lseek (new_, (long) data_scnptr, 0);
|
|
428
|
861 ptr = (char *) f_ohdr.data_start;
|
|
|
862 end = ptr + f_ohdr.dsize;
|
|
3025
|
863 write_segment (new_, ptr, end);
|
|
428
|
864 }
|
|
|
865 else if (!scntemp.s_scnptr)
|
|
|
866 ; /* do nothing - no data for this section */
|
|
|
867 else
|
|
|
868 {
|
|
|
869 char page[BUFSIZ];
|
|
|
870 int size, n;
|
|
|
871 long old_a_out_ptr = lseek (a_out, 0, 1);
|
|
|
872
|
|
|
873 lseek (a_out, scntemp.s_scnptr, 0);
|
|
|
874 for (size = scntemp.s_size; size > 0; size -= sizeof (page))
|
|
|
875 {
|
|
|
876 n = size > sizeof (page) ? sizeof (page) : size;
|
|
3025
|
877 if (read (a_out, page, n) != n || write (new_, page, n) != n)
|
|
428
|
878 PERROR ("emacs");
|
|
|
879 }
|
|
|
880 lseek (a_out, old_a_out_ptr, 0);
|
|
|
881 }
|
|
|
882 }
|
|
|
883
|
|
|
884 #else /* COFF, but not USG_SHARED_LIBRARIES */
|
|
|
885
|
|
3025
|
886 lseek (new_, (long) text_scnptr, 0);
|
|
428
|
887 ptr = (char *) f_ohdr.text_start;
|
|
|
888 #ifdef HEADER_INCL_IN_TEXT
|
|
|
889 /* For Gould UTX/32, text starts after headers */
|
|
|
890 ptr = (char *) (ptr + text_scnptr);
|
|
|
891 #endif /* HEADER_INCL_IN_TEXT */
|
|
|
892 end = ptr + f_ohdr.tsize;
|
|
3025
|
893 write_segment (new_, ptr, end);
|
|
428
|
894
|
|
3025
|
895 lseek (new_, (long) data_scnptr, 0);
|
|
428
|
896 ptr = (char *) f_ohdr.data_start;
|
|
|
897 end = ptr + f_ohdr.dsize;
|
|
3025
|
898 write_segment (new_, ptr, end);
|
|
428
|
899
|
|
|
900 #endif /* USG_SHARED_LIBRARIES */
|
|
|
901
|
|
|
902 #else /* if not COFF */
|
|
|
903
|
|
|
904 /* Some machines count the header as part of the text segment.
|
|
|
905 That is to say, the header appears in core
|
|
|
906 just before the address that start_of_text returns.
|
|
|
907 For them, N_TXTOFF is the place where the header goes.
|
|
|
908 We must adjust the seek to the place after the header.
|
|
|
909 Note that at this point hdr.a_text does *not* count
|
|
|
910 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
|
|
|
911
|
|
|
912 #ifdef A_TEXT_SEEK
|
|
3025
|
913 lseek (new_, (long) A_TEXT_SEEK (hdr), 0);
|
|
428
|
914 #else
|
|
3025
|
915 lseek (new_, (long) N_TXTOFF (hdr), 0);
|
|
428
|
916 #endif /* no A_TEXT_SEEK */
|
|
|
917
|
|
|
918 #ifdef RISCiX
|
|
|
919
|
|
|
920 /* Acorn's RISC-iX has a wacky way of initializing the position of the heap.
|
|
|
921 * There is a little table in crt0.o that is filled at link time with
|
|
|
922 * the min and current brk positions, among other things. When start
|
|
|
923 * runs, it copies the table to where these parameters live during
|
|
|
924 * execution. This data is in text space, so it cannot be modified here
|
|
|
925 * before saving the executable, so the data is written manually. In
|
|
|
926 * addition, the table does not have a label, and the nearest accessible
|
|
|
927 * label (mcount) is not prefixed with a '_', thus making it inaccessible
|
|
|
928 * from within C programs. To overcome this, emacs's executable is passed
|
|
|
929 * through the command 'nm %s | fgrep mcount' into a pipe, and the
|
|
|
930 * resultant output is then used to find the address of 'mcount'. As far as
|
|
|
931 * is possible to determine, in RISC-iX releases prior to 1.2, the negative
|
|
|
932 * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
|
|
|
933 * 0x30. bss_end has been rounded up to page boundary. This solution is
|
|
|
934 * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
|
|
|
935 * avoids the need for a custom version of crt0.o for emacs which has its
|
|
|
936 * table in data space.
|
|
|
937 */
|
|
|
938
|
|
|
939 {
|
|
|
940 char command[1024];
|
|
|
941 char errbuf[1024];
|
|
|
942 char address_text[32];
|
|
|
943 int proforma[4];
|
|
|
944 FILE *pfile;
|
|
|
945 char *temp_ptr;
|
|
|
946 char c;
|
|
|
947 int mcount_address, mcount_offset, count;
|
|
|
948 extern char *_execname;
|
|
438
|
949
|
|
428
|
950
|
|
|
951 /* The use of _execname is incompatible with RISCiX 1.1 */
|
|
|
952 sprintf (command, "nm %s | fgrep mcount", _execname);
|
|
|
953
|
|
|
954 if ( (pfile = popen(command, "r")) == NULL)
|
|
|
955 {
|
|
|
956 sprintf (errbuf, "Could not open pipe");
|
|
|
957 PERROR (errbuf);
|
|
|
958 }
|
|
|
959
|
|
|
960 count=0;
|
|
|
961 while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
|
|
|
962 address_text[count++]=c;
|
|
|
963 address_text[count]=0;
|
|
|
964
|
|
|
965 if ((count == 0) || pclose(pfile) != NULL)
|
|
|
966 {
|
|
|
967 sprintf (errbuf, "Failed to execute the command '%s'\n", command);
|
|
|
968 PERROR (errbuf);
|
|
438
|
969 }
|
|
428
|
970
|
|
|
971 sscanf(address_text, "%x", &mcount_address);
|
|
|
972 ptr = (char *) unexec_text_start;
|
|
|
973 mcount_offset = (char *)mcount_address - ptr;
|
|
|
974
|
|
|
975 #ifdef RISCiX_1_1
|
|
|
976 #define EDATA_OFFSET 0x2c
|
|
|
977 #else
|
|
|
978 #define EDATA_OFFSET 0x30
|
|
|
979 #endif
|
|
|
980
|
|
|
981 end = ptr + mcount_offset - EDATA_OFFSET;
|
|
|
982
|
|
3025
|
983 write_segment (new_, ptr, end);
|
|
428
|
984
|
|
|
985 proforma[0] = bss_end; /* becomes _edata */
|
|
|
986 proforma[1] = bss_end; /* becomes _end */
|
|
|
987 proforma[2] = bss_end; /* becomes _minbrk */
|
|
|
988 proforma[3] = bss_end; /* becomes _curbrk */
|
|
|
989
|
|
3025
|
990 write (new_, proforma, 16);
|
|
428
|
991
|
|
|
992 temp_ptr = ptr;
|
|
|
993 ptr = end + 16;
|
|
|
994 end = temp_ptr + hdr.a_text;
|
|
|
995
|
|
3025
|
996 write_segment (new_, ptr, end);
|
|
428
|
997 }
|
|
|
998
|
|
|
999 #else /* !RISCiX */
|
|
|
1000 ptr = (char *) unexec_text_start;
|
|
|
1001 end = ptr + hdr.a_text;
|
|
3025
|
1002 write_segment (new_, ptr, end);
|
|
428
|
1003 #endif /* RISCiX */
|
|
|
1004
|
|
|
1005 ptr = (char *) unexec_data_start;
|
|
|
1006 end = ptr + hdr.a_data;
|
|
|
1007 /* This lseek is certainly incorrect when A_TEXT_OFFSET
|
|
|
1008 and I believe it is a no-op otherwise.
|
|
|
1009 Let's see if its absence ever fails. */
|
|
3025
|
1010 /* lseek (new_, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
|
|
|
1011 write_segment (new_, ptr, end);
|
|
428
|
1012
|
|
|
1013 #endif /* not COFF */
|
|
|
1014
|
|
|
1015 return 0;
|
|
|
1016 }
|
|
|
1017
|
|
|
1018 static void
|
|
3025
|
1019 write_segment (new_, ptr, end)
|
|
|
1020 int new_;
|
|
428
|
1021 char *ptr, *end;
|
|
|
1022 {
|
|
|
1023 int i, nwrite, ret;
|
|
|
1024 #if 0
|
|
|
1025 char buf[80];
|
|
|
1026 #endif
|
|
|
1027 /* This is the normal amount to write at once.
|
|
|
1028 It is the size of block that NFS uses. */
|
|
|
1029 int writesize = 1 << 13;
|
|
|
1030 int pagesize = getpagesize ();
|
|
|
1031 char zeros[1 << 13];
|
|
|
1032
|
|
|
1033 memset (zeros, 0, sizeof (zeros));
|
|
|
1034
|
|
|
1035 for (i = 0; ptr < end;)
|
|
|
1036 {
|
|
|
1037 /* Distance to next multiple of writesize. */
|
|
|
1038 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
|
|
|
1039 /* But not beyond specified end. */
|
|
|
1040 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
3025
|
1041 ret = write (new_, ptr, nwrite);
|
|
428
|
1042 /* If write gets a page fault, it means we reached
|
|
|
1043 a gap between the old text segment and the old data segment.
|
|
|
1044 This gap has probably been remapped into part of the text segment.
|
|
|
1045 So write zeros for it. */
|
|
|
1046 if (ret == -1
|
|
|
1047 #ifdef EFAULT
|
|
|
1048 && errno == EFAULT
|
|
|
1049 #endif
|
|
|
1050 )
|
|
|
1051 {
|
|
|
1052 /* Write only a page of zeros at once,
|
|
|
1053 so that we don't overshoot the start
|
|
|
1054 of the valid memory in the old data segment. */
|
|
|
1055 if (nwrite > pagesize)
|
|
|
1056 nwrite = pagesize;
|
|
3025
|
1057 write (new_, zeros, nwrite);
|
|
428
|
1058 }
|
|
|
1059 #if 0 /* Now that we have can ask `write' to write more than a page,
|
|
|
1060 it is legit for write do less than the whole amount specified. */
|
|
|
1061 else if (nwrite != ret)
|
|
|
1062 {
|
|
|
1063 sprintf (buf,
|
|
|
1064 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
3025
|
1065 (unsigned long) ptr, new_, nwrite, ret, errno);
|
|
428
|
1066 PERROR (buf);
|
|
|
1067 }
|
|
|
1068 #endif
|
|
|
1069 i += nwrite;
|
|
|
1070 ptr += nwrite;
|
|
|
1071 }
|
|
|
1072 }
|
|
|
1073
|
|
|
1074 /* ****************************************************************
|
|
|
1075 * copy_sym
|
|
|
1076 *
|
|
|
1077 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
1078 */
|
|
|
1079 static int
|
|
3025
|
1080 copy_sym (int new_, int a_out, char *a_name, char *new_name)
|
|
428
|
1081 {
|
|
|
1082 char page[1024];
|
|
|
1083 int n;
|
|
|
1084
|
|
|
1085 if (a_out < 0)
|
|
|
1086 return 0;
|
|
|
1087
|
|
|
1088 #ifdef COFF
|
|
|
1089 if (SYMS_START == 0L)
|
|
|
1090 return 0;
|
|
|
1091 #endif /* COFF */
|
|
|
1092
|
|
|
1093 #ifdef COFF
|
|
|
1094 if (lnnoptr) /* if there is line number info */
|
|
|
1095 lseek (a_out, lnnoptr, 0); /* start copying from there */
|
|
|
1096 else
|
|
|
1097 #endif /* COFF */
|
|
|
1098 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
|
|
1099
|
|
647
|
1100 while ((n = read (a_out, page, sizeof (page))) > 0)
|
|
428
|
1101 {
|
|
3025
|
1102 if (write (new_, page, n) != n)
|
|
428
|
1103 {
|
|
|
1104 PERROR (new_name);
|
|
|
1105 }
|
|
|
1106 }
|
|
|
1107 if (n < 0)
|
|
|
1108 {
|
|
|
1109 PERROR (a_name);
|
|
|
1110 }
|
|
|
1111 return 0;
|
|
|
1112 }
|
|
|
1113
|
|
|
1114 /* ****************************************************************
|
|
|
1115 * mark_x
|
|
|
1116 *
|
|
|
1117 * After successfully building the new a.out, mark it executable
|
|
|
1118 */
|
|
|
1119 static void
|
|
|
1120 mark_x (char *name)
|
|
|
1121 {
|
|
|
1122 struct stat sbuf;
|
|
|
1123 int um;
|
|
3025
|
1124 int new_ = 0; /* for PERROR */
|
|
428
|
1125
|
|
|
1126 um = umask (777);
|
|
|
1127 umask (um);
|
|
|
1128 if (stat (name, &sbuf) == -1)
|
|
|
1129 {
|
|
|
1130 PERROR (name);
|
|
|
1131 }
|
|
|
1132 sbuf.st_mode |= 0111 & ~um;
|
|
|
1133 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
1134 PERROR (name);
|
|
|
1135 }
|
|
|
1136
|
|
|
1137 #ifdef COFF
|
|
|
1138 #ifndef COFF_BSD_SYMBOLS
|
|
|
1139
|
|
|
1140 /*
|
|
|
1141 * If the COFF file contains a symbol table and a line number section,
|
|
|
1142 * then any auxiliary entries that have values for x_lnnoptr must
|
|
|
1143 * be adjusted by the amount that the line number section has moved
|
|
|
1144 * in the file (bias computed in make_hdr). The #@$%&* designers of
|
|
|
1145 * the auxiliary entry structures used the absolute file offsets for
|
|
|
1146 * the line number entry rather than an offset from the start of the
|
|
|
1147 * line number section!
|
|
|
1148 *
|
|
|
1149 * When I figure out how to scan through the symbol table and pick out
|
|
|
1150 * the auxiliary entries that need adjustment, this routine will
|
|
|
1151 * be fixed. As it is now, all such entries are wrong and sdb
|
|
|
1152 * will complain. Fred Fish, UniSoft Systems Inc.
|
|
|
1153 */
|
|
|
1154
|
|
|
1155 /* This function is probably very slow. Instead of reopening the new
|
|
|
1156 file for input and output it should copy from the old to the new
|
|
|
1157 using the two descriptors already open (WRITEDESC and READDESC).
|
|
|
1158 Instead of reading one small structure at a time it should use
|
|
|
1159 a reasonable size buffer. But I don't have time to work on such
|
|
|
1160 things, so I am installing it as submitted to me. -- RMS. */
|
|
|
1161
|
|
|
1162 int
|
|
|
1163 adjust_lnnoptrs (writedesc, readdesc, new_name)
|
|
2286
|
1164 int UNUSED (writedesc);
|
|
|
1165 int UNUSED (readdesc);
|
|
428
|
1166 char *new_name;
|
|
|
1167 {
|
|
|
1168 int nsyms;
|
|
3025
|
1169 int new_;
|
|
428
|
1170 #if defined (amdahl_uts) || defined (pfa)
|
|
|
1171 SYMENT symentry;
|
|
|
1172 AUXENT auxentry;
|
|
|
1173 #else
|
|
|
1174 struct syment symentry;
|
|
|
1175 union auxent auxentry;
|
|
|
1176 #endif
|
|
|
1177
|
|
|
1178 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
1179 return 0;
|
|
|
1180
|
|
3025
|
1181 if ((new_ = open (new_name, O_RDWR)) < 0)
|
|
428
|
1182 {
|
|
|
1183 PERROR (new_name);
|
|
|
1184 return -1;
|
|
|
1185 }
|
|
|
1186
|
|
3025
|
1187 lseek (new_, f_hdr.f_symptr, 0);
|
|
428
|
1188 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
1189 {
|
|
3025
|
1190 read (new_, &symentry, SYMESZ);
|
|
428
|
1191 if (symentry.n_numaux)
|
|
|
1192 {
|
|
3025
|
1193 read (new_, &auxentry, AUXESZ);
|
|
428
|
1194 nsyms++;
|
|
|
1195 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400)
|
|
|
1196 {
|
|
|
1197 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
3025
|
1198 lseek (new_, -AUXESZ, 1);
|
|
|
1199 write (new_, &auxentry, AUXESZ);
|
|
428
|
1200 }
|
|
|
1201 }
|
|
|
1202 }
|
|
3025
|
1203 close (new_);
|
|
428
|
1204 return 0;
|
|
|
1205 }
|
|
|
1206
|
|
|
1207 #endif /* COFF_BSD_SYMBOLS */
|
|
|
1208
|
|
|
1209 #endif /* COFF */
|
