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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
|
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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172 #define PERROR(file) report_error (file, new)
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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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|
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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
|
187 # include <errno.h>
|
|
428
|
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 #ifndef CANNOT_DUMP /* all rest of file! */
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200
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201 #ifdef COFF_ENCAPSULATE
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202 int need_coff_header = 1;
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203 #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
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204 #else
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205 #include <a.out.h>
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206 #endif /* not COFF_ENCAPSULATE */
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207
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208 /* Define getpagesize if the system does not.
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209 Note that this may depend on symbols defined in a.out.h. */
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210 #include "getpagesize.h"
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211
|
|
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212 #ifndef makedev /* Try to detect types.h already loaded */
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213 #include <sys/types.h>
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214 #endif /* makedev */
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|
215 #include <stdio.h>
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|
216 #include <sys/stat.h>
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|
217 #include <errno.h>
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218
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|
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219 #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
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220
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|
|
221 #ifdef USG5
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|
222 #include <fcntl.h>
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|
223 #endif
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224
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|
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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
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233 extern char *start_of_text (); /* Start of text */
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234
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|
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235 extern void *start_of_data (); /* Start of initialized data */
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236
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|
|
237 #ifdef COFF
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|
238 static long block_copy_start; /* Old executable start point */
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|
239 static struct filehdr f_hdr; /* File header */
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|
240 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
|
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|
241 long bias; /* Bias to add for growth */
|
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|
242 long lnnoptr; /* Pointer to line-number info within file */
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|
|
243 #define SYMS_START block_copy_start
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244
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|
245 static long text_scnptr;
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|
246 static long data_scnptr;
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247
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|
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248 #else /* not COFF */
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249
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|
|
250 #ifdef __STDC__
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|
251 #ifndef __sys_stdtypes_h
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|
252 #if !defined(_PTRDIFF_T) && !defined(_BSD_PTRDIFF_T_)
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253 typedef long ptrdiff_t;
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|
|
254 #endif
|
|
|
255 #endif
|
|
|
256 #ifndef HPUX
|
|
|
257 /* not sure where this for NetBSD should really go
|
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|
258 and it probably applies to other systems */
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|
259 #if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__)
|
|
|
260 extern void *sbrk (ptrdiff_t);
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|
|
261 #else
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|
|
262 extern char *sbrk ();
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|
|
263 #endif /* __NetBSD__ or __OpenBSD__ */
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|
|
264 #endif /* HPUX */
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|
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265 #else
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|
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266 extern void *sbrk ();
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|
|
267 #endif
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268
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269 #define SYMS_START ((long) N_SYMOFF (ohdr))
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270
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|
|
271 /* Some machines override the structure name for an a.out header. */
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|
272 #ifndef EXEC_HDR_TYPE
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|
|
273 #define EXEC_HDR_TYPE struct exec
|
|
|
274 #endif
|
|
|
275
|
|
|
276 #ifdef HPUX
|
|
|
277 #ifdef HP9000S200_ID
|
|
|
278 #define MY_ID HP9000S200_ID
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|
|
279 #else
|
|
|
280 #include <model.h>
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|
|
281 #define MY_ID MYSYS
|
|
|
282 #endif /* no HP9000S200_ID */
|
|
|
283 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
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|
284 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
|
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|
285 #define N_TXTOFF(x) TEXT_OFFSET(x)
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286 #define N_SYMOFF(x) LESYM_OFFSET(x)
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287 static EXEC_HDR_TYPE hdr, ohdr;
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288
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289 #else /* not HPUX */
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290
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|
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291 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
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|
|
292 static struct bhdr hdr, ohdr;
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|
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293 #define a_magic fmagic
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|
|
294 #define a_text tsize
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|
|
295 #define a_data dsize
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|
296 #define a_bss bsize
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|
|
297 #define a_syms ssize
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|
|
298 #define a_trsize rtsize
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|
|
299 #define a_drsize rdsize
|
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|
300 #define a_entry entry
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|
301 #define N_BADMAG(x) \
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|
302 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
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|
303 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
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|
|
304 #define NEWMAGIC FMAGIC
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|
|
305 #else /* IRIS or IBMAIX or not USG */
|
|
|
306 static EXEC_HDR_TYPE hdr, ohdr;
|
|
|
307 #define NEWMAGIC ZMAGIC
|
|
|
308 #endif /* IRIS or IBMAIX not USG */
|
|
|
309 #endif /* not HPUX */
|
|
|
310
|
|
|
311 static int unexec_text_start;
|
|
|
312 static int unexec_data_start;
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|
313
|
|
|
314 #ifdef COFF_ENCAPSULATE
|
|
|
315 /* coffheader is defined in the GNU a.out.encap.h file. */
|
|
|
316 struct coffheader coffheader;
|
|
|
317 #endif
|
|
|
318
|
|
|
319 #endif /* not COFF */
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|
|
320
|
|
|
321 static int pagemask;
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|
|
322
|
|
|
323 /* Correct an int which is the bit pattern of a pointer to a byte
|
|
|
324 into an int which is the number of a byte.
|
|
|
325 This is a no-op on ordinary machines, but not on all. */
|
|
|
326
|
|
|
327 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
|
|
|
328 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
|
|
|
329 #endif
|
|
|
330
|
|
|
331 #ifdef emacs
|
|
|
332
|
|
|
333 #include "lisp.h"
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|
|
334
|
|
|
335 static void
|
|
440
|
336 report_error (const char *file, int fd)
|
|
428
|
337 {
|
|
|
338 if (fd)
|
|
|
339 close (fd);
|
|
563
|
340 report_error_with_errno (Qio_error, "Cannot unexec",
|
|
|
341 build_ext_string (file, Qfile_name));
|
|
428
|
342 }
|
|
|
343 #endif /* emacs */
|
|
|
344
|
|
|
345 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
|
|
|
346 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
|
|
|
347 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
|
|
|
348
|
|
|
349 static void
|
|
|
350 report_error_1 (fd, msg, a1, a2)
|
|
|
351 int fd;
|
|
442
|
352 const char *msg;
|
|
428
|
353 int a1, a2;
|
|
|
354 {
|
|
|
355 close (fd);
|
|
|
356 #ifdef emacs
|
|
563
|
357 signal_ferror (Qio_error, msg, a1, a2);
|
|
428
|
358 #else
|
|
|
359 fprintf (stderr, msg, a1, a2);
|
|
|
360 fprintf (stderr, "\n");
|
|
|
361 #endif
|
|
|
362 }
|
|
|
363
|
|
|
364 static int make_hdr (int new, int a_out, unsigned data_start,
|
|
|
365 unsigned bss_start, unsigned entry_address,
|
|
|
366 char *a_name, char *new_name);
|
|
|
367 static int copy_text_and_data (int new, int a_out);
|
|
|
368 static int copy_sym (int new, int a_out, char *a_name, char *new_name);
|
|
|
369 static void mark_x (char *name);
|
|
|
370
|
|
|
371 /* ****************************************************************
|
|
|
372 * unexec
|
|
|
373 *
|
|
|
374 * driving logic.
|
|
|
375 */
|
|
|
376 int
|
|
|
377 unexec (new_name, a_name, data_start, bss_start, entry_address)
|
|
|
378 char *new_name, *a_name;
|
|
|
379 unsigned data_start, bss_start, entry_address;
|
|
|
380 {
|
|
|
381 int new, a_out = -1;
|
|
|
382
|
|
|
383 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
|
|
|
384 {
|
|
|
385 PERROR (a_name);
|
|
|
386 }
|
|
|
387 if ((new = creat (new_name, 0666)) < 0)
|
|
|
388 {
|
|
|
389 PERROR (new_name);
|
|
|
390 }
|
|
|
391
|
|
|
392 if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
|
|
|
393 || copy_text_and_data (new, a_out) < 0
|
|
|
394 || copy_sym (new, a_out, a_name, new_name) < 0
|
|
|
395 #ifdef COFF
|
|
|
396 #ifndef COFF_BSD_SYMBOLS
|
|
|
397 || adjust_lnnoptrs (new, a_out, new_name) < 0
|
|
|
398 #endif
|
|
|
399 #endif
|
|
|
400 )
|
|
|
401 {
|
|
|
402 close (new);
|
|
|
403 /* unlink (new_name); / * Failed, unlink new a.out */
|
|
438
|
404 return -1;
|
|
428
|
405 }
|
|
|
406
|
|
|
407 close (new);
|
|
|
408 if (a_out >= 0)
|
|
|
409 close (a_out);
|
|
|
410 mark_x (new_name);
|
|
|
411 return 0;
|
|
|
412 }
|
|
|
413
|
|
|
414 /* ****************************************************************
|
|
|
415 * make_hdr
|
|
|
416 *
|
|
|
417 * Make the header in the new a.out from the header in core.
|
|
|
418 * Modify the text and data sizes.
|
|
|
419 */
|
|
|
420 static int
|
|
|
421 make_hdr (int new, int a_out, unsigned data_start, unsigned bss_start,
|
|
|
422 unsigned entry_address, char *a_name, char *new_name)
|
|
|
423 {
|
|
|
424 #ifdef COFF
|
|
|
425 auto struct scnhdr f_thdr; /* Text section header */
|
|
|
426 auto struct scnhdr f_dhdr; /* Data section header */
|
|
|
427 auto struct scnhdr f_bhdr; /* Bss section header */
|
|
|
428 auto struct scnhdr scntemp; /* Temporary section header */
|
|
|
429 int scns;
|
|
|
430 #endif /* COFF */
|
|
|
431 #ifdef USG_SHARED_LIBRARIES
|
|
|
432 extern unsigned int bss_end;
|
|
|
433 #else
|
|
|
434 unsigned int bss_end;
|
|
|
435 #endif
|
|
|
436
|
|
|
437 pagemask = getpagesize () - 1;
|
|
|
438
|
|
|
439 /* Adjust text/data boundary. */
|
|
|
440 #ifdef NO_REMAP
|
|
|
441 data_start = (int) start_of_data ();
|
|
|
442 #else /* not NO_REMAP */
|
|
|
443 if (!data_start)
|
|
|
444 data_start = (int) start_of_data ();
|
|
|
445 #endif /* not NO_REMAP */
|
|
|
446 data_start = ADDR_CORRECT (data_start);
|
|
|
447
|
|
|
448 #ifdef SEGMENT_MASK
|
|
|
449 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
|
|
|
450 #else
|
|
|
451 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
|
|
|
452 #endif
|
|
|
453
|
|
|
454 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
|
|
|
455 bss_end &= ~ pagemask;
|
|
|
456
|
|
|
457 /* Adjust data/bss boundary. */
|
|
|
458 if (bss_start != 0)
|
|
|
459 {
|
|
|
460 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
|
|
|
461 /* (Up) to page bdry. */
|
|
|
462 bss_start &= ~ pagemask;
|
|
|
463 if (bss_start > bss_end)
|
|
|
464 {
|
|
|
465 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
|
|
|
466 bss_start);
|
|
|
467 }
|
|
|
468 }
|
|
|
469 else
|
|
|
470 bss_start = bss_end;
|
|
|
471
|
|
|
472 if (data_start > bss_start) /* Can't have negative data size. */
|
|
|
473 {
|
|
|
474 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
|
|
|
475 data_start, bss_start);
|
|
|
476 }
|
|
|
477
|
|
|
478 #ifdef COFF
|
|
|
479 /* Salvage as much info from the existing file as possible */
|
|
|
480 if (a_out >= 0)
|
|
|
481 {
|
|
|
482 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
483 {
|
|
|
484 PERROR (a_name);
|
|
|
485 }
|
|
|
486 block_copy_start += sizeof (f_hdr);
|
|
|
487 if (f_hdr.f_opthdr > 0)
|
|
|
488 {
|
|
|
489 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
490 {
|
|
|
491 PERROR (a_name);
|
|
|
492 }
|
|
|
493 block_copy_start += sizeof (f_ohdr);
|
|
|
494 }
|
|
|
495 /* Loop through section headers, copying them in */
|
|
|
496 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
497 for (scns = f_hdr.f_nscns; scns > 0; scns--) {
|
|
|
498 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
499 {
|
|
|
500 PERROR (a_name);
|
|
|
501 }
|
|
|
502 if (scntemp.s_scnptr > 0L)
|
|
|
503 {
|
|
|
504 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
|
|
|
505 block_copy_start = scntemp.s_scnptr + scntemp.s_size;
|
|
|
506 }
|
|
|
507 if (strcmp (scntemp.s_name, ".text") == 0)
|
|
|
508 {
|
|
|
509 f_thdr = scntemp;
|
|
|
510 }
|
|
|
511 else if (strcmp (scntemp.s_name, ".data") == 0)
|
|
|
512 {
|
|
|
513 f_dhdr = scntemp;
|
|
|
514 }
|
|
|
515 else if (strcmp (scntemp.s_name, ".bss") == 0)
|
|
|
516 {
|
|
|
517 f_bhdr = scntemp;
|
|
|
518 }
|
|
|
519 }
|
|
|
520 }
|
|
|
521 else
|
|
|
522 {
|
|
|
523 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
524 }
|
|
|
525
|
|
|
526 /* Now we alter the contents of all the f_*hdr variables
|
|
|
527 to correspond to what we want to dump. */
|
|
|
528
|
|
|
529 #ifdef USG_SHARED_LIBRARIES
|
|
|
530
|
|
|
531 /* The amount of data we're adding to the file is distance from the
|
|
|
532 * end of the original .data space to the current end of the .data
|
|
|
533 * space.
|
|
|
534 */
|
|
|
535
|
|
|
536 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size);
|
|
|
537
|
|
|
538 #endif
|
|
|
539
|
|
|
540 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
|
|
|
541 #ifdef TPIX
|
|
|
542 f_hdr.f_nscns = 3;
|
|
|
543 #endif
|
|
|
544 #ifdef EXEC_MAGIC
|
|
|
545 f_ohdr.magic = EXEC_MAGIC;
|
|
|
546 #endif
|
|
|
547 #ifndef NO_REMAP
|
|
|
548 f_ohdr.text_start = (long) start_of_text ();
|
|
|
549 f_ohdr.tsize = data_start - f_ohdr.text_start;
|
|
|
550 f_ohdr.data_start = data_start;
|
|
|
551 #endif /* NO_REMAP */
|
|
|
552 f_ohdr.dsize = bss_start - f_ohdr.data_start;
|
|
|
553 f_ohdr.bsize = bss_end - bss_start;
|
|
|
554 #ifndef KEEP_OLD_TEXT_SCNPTR
|
|
|
555 /* On some machines, the old values are right.
|
|
|
556 ??? Maybe on all machines with NO_REMAP. */
|
|
|
557 f_thdr.s_size = f_ohdr.tsize;
|
|
|
558 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
|
|
|
559 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
560 #endif /* KEEP_OLD_TEXT_SCNPTR */
|
|
|
561 #ifdef ADJUST_TEXT_SCNHDR_SIZE
|
|
|
562 /* On some machines, `text size' includes all headers. */
|
|
|
563 f_thdr.s_size -= f_thdr.s_scnptr;
|
|
|
564 #endif /* ADJUST_TEST_SCNHDR_SIZE */
|
|
|
565 lnnoptr = f_thdr.s_lnnoptr;
|
|
|
566 #ifdef SECTION_ALIGNMENT
|
|
|
567 /* Some systems require special alignment
|
|
|
568 of the sections in the file itself. */
|
|
|
569 f_thdr.s_scnptr
|
|
|
570 = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
571 #endif /* SECTION_ALIGNMENT */
|
|
|
572 #ifdef TPIX
|
|
|
573 f_thdr.s_scnptr = 0xd0;
|
|
|
574 #endif
|
|
|
575 text_scnptr = f_thdr.s_scnptr;
|
|
|
576 #ifdef ADJUST_TEXTBASE
|
|
|
577 text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
578 #endif
|
|
|
579 #ifndef KEEP_OLD_PADDR
|
|
|
580 f_dhdr.s_paddr = f_ohdr.data_start;
|
|
|
581 #endif /* KEEP_OLD_PADDR */
|
|
|
582 f_dhdr.s_vaddr = f_ohdr.data_start;
|
|
|
583 f_dhdr.s_size = f_ohdr.dsize;
|
|
|
584 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
|
|
|
585 #ifdef SECTION_ALIGNMENT
|
|
|
586 /* Some systems require special alignment
|
|
|
587 of the sections in the file itself. */
|
|
|
588 f_dhdr.s_scnptr
|
|
|
589 = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
590 #endif /* SECTION_ALIGNMENT */
|
|
|
591 #ifdef DATA_SECTION_ALIGNMENT
|
|
|
592 /* Some systems require special alignment
|
|
|
593 of the data section only. */
|
|
|
594 f_dhdr.s_scnptr
|
|
|
595 = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
|
|
|
596 #endif /* DATA_SECTION_ALIGNMENT */
|
|
|
597 data_scnptr = f_dhdr.s_scnptr;
|
|
|
598 #ifndef KEEP_OLD_PADDR
|
|
|
599 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
600 #endif /* KEEP_OLD_PADDR */
|
|
|
601 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
602 f_bhdr.s_size = f_ohdr.bsize;
|
|
|
603 f_bhdr.s_scnptr = 0L;
|
|
|
604 #ifndef USG_SHARED_LIBRARIES
|
|
|
605 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
|
|
|
606 #endif
|
|
|
607
|
|
|
608 if (f_hdr.f_symptr > 0L)
|
|
|
609 {
|
|
|
610 f_hdr.f_symptr += bias;
|
|
|
611 }
|
|
|
612
|
|
|
613 if (f_thdr.s_lnnoptr > 0L)
|
|
|
614 {
|
|
|
615 f_thdr.s_lnnoptr += bias;
|
|
|
616 }
|
|
|
617
|
|
|
618 #ifdef ADJUST_EXEC_HEADER
|
|
|
619 ADJUST_EXEC_HEADER;
|
|
|
620 #endif /* ADJUST_EXEC_HEADER */
|
|
|
621
|
|
|
622 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
623 {
|
|
|
624 PERROR (new_name);
|
|
|
625 }
|
|
|
626
|
|
|
627 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
628 {
|
|
|
629 PERROR (new_name);
|
|
|
630 }
|
|
|
631
|
|
|
632 #ifndef USG_SHARED_LIBRARIES
|
|
|
633
|
|
|
634 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
635 {
|
|
|
636 PERROR (new_name);
|
|
|
637 }
|
|
|
638
|
|
|
639 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
640 {
|
|
|
641 PERROR (new_name);
|
|
|
642 }
|
|
|
643
|
|
|
644 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
645 {
|
|
|
646 PERROR (new_name);
|
|
|
647 }
|
|
|
648
|
|
|
649 #else /* USG_SHARED_LIBRARIES */
|
|
|
650
|
|
|
651 /* The purpose of this code is to write out the new file's section
|
|
|
652 * header table.
|
|
|
653 *
|
|
|
654 * Scan through the original file's sections. If the encountered
|
|
|
655 * section is one we know (.text, .data or .bss), write out the
|
|
|
656 * correct header. If it is a section we do not know (such as
|
|
|
657 * .lib), adjust the address of where the section data is in the
|
|
|
658 * file, and write out the header.
|
|
|
659 *
|
|
|
660 * If any section precedes .text or .data in the file, this code
|
|
|
661 * will not adjust the file pointer for that section correctly.
|
|
|
662 */
|
|
|
663
|
|
|
664 /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
|
|
|
665 .f_opthdr is said to be right when there is no optional header. */
|
|
|
666 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
667
|
|
|
668 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
669 {
|
|
|
670 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
671 PERROR (a_name);
|
|
|
672
|
|
|
673 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */
|
|
|
674 {
|
|
|
675 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
676 PERROR (new_name);
|
|
|
677 }
|
|
|
678 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */
|
|
|
679 {
|
|
|
680 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
681 PERROR (new_name);
|
|
|
682 }
|
|
|
683 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */
|
|
|
684 {
|
|
|
685 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
686 PERROR (new_name);
|
|
|
687 }
|
|
|
688 else
|
|
|
689 {
|
|
|
690 if (scntemp.s_scnptr)
|
|
|
691 scntemp.s_scnptr += bias;
|
|
|
692 if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
693 PERROR (new_name);
|
|
|
694 }
|
|
|
695 }
|
|
|
696 #endif /* USG_SHARED_LIBRARIES */
|
|
|
697
|
|
|
698 return (0);
|
|
|
699
|
|
|
700 #else /* if not COFF */
|
|
|
701
|
|
|
702 /* Get symbol table info from header of a.out file if given one. */
|
|
|
703 if (a_out >= 0)
|
|
|
704 {
|
|
|
705 #ifdef COFF_ENCAPSULATE
|
|
647
|
706 if (read (a_out, &coffheader, sizeof (coffheader)) != sizeof (coffheader))
|
|
428
|
707 {
|
|
|
708 PERROR(a_name);
|
|
|
709 }
|
|
|
710 if (coffheader.f_magic != COFF_MAGIC)
|
|
|
711 {
|
|
|
712 ERROR1("%s doesn't have legal coff magic number\n", a_name);
|
|
|
713 }
|
|
|
714 #endif
|
|
647
|
715 if (read (a_out, (char *) &ohdr, sizeof (hdr)) != sizeof (hdr))
|
|
428
|
716 {
|
|
|
717 PERROR (a_name);
|
|
|
718 }
|
|
|
719
|
|
|
720 if (N_BADMAG (ohdr))
|
|
|
721 {
|
|
|
722 ERROR1 ("invalid magic number in %s", a_name);
|
|
|
723 }
|
|
|
724 hdr = ohdr;
|
|
|
725 }
|
|
|
726 else
|
|
|
727 {
|
|
|
728 #ifdef COFF_ENCAPSULATE
|
|
|
729 /* We probably could without too much trouble. The code is in gld
|
|
|
730 * but I don't have that much time or incentive.
|
|
|
731 */
|
|
|
732 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
733 #else
|
|
647
|
734 memset ((void *)&hdr, 0, sizeof (hdr));
|
|
428
|
735 #endif
|
|
|
736 }
|
|
|
737
|
|
|
738 unexec_text_start = (long) start_of_text ();
|
|
|
739 unexec_data_start = data_start;
|
|
|
740
|
|
|
741 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
|
|
|
742 #ifdef ADJUST_EXEC_HEADER
|
|
|
743 ADJUST_EXEC_HEADER;
|
|
|
744 #endif /* ADJUST_EXEC_HEADER */
|
|
|
745
|
|
|
746 hdr.a_trsize = 0;
|
|
|
747 hdr.a_drsize = 0;
|
|
|
748 if (entry_address != 0)
|
|
|
749 hdr.a_entry = entry_address;
|
|
|
750
|
|
|
751 hdr.a_bss = bss_end - bss_start;
|
|
|
752 hdr.a_data = bss_start - data_start;
|
|
|
753 #ifdef NO_REMAP
|
|
|
754 hdr.a_text = ohdr.a_text;
|
|
|
755 #else /* not NO_REMAP */
|
|
|
756 hdr.a_text = data_start - unexec_text_start;
|
|
|
757
|
|
|
758 #ifdef A_TEXT_OFFSET
|
|
|
759 hdr.a_text += A_TEXT_OFFSET (ohdr);
|
|
|
760 #endif
|
|
|
761
|
|
|
762 #endif /* not NO_REMAP */
|
|
|
763
|
|
|
764 #ifdef COFF_ENCAPSULATE
|
|
|
765 /* We are encapsulating BSD format within COFF format. */
|
|
|
766 {
|
|
|
767 struct coffscn *tp, *dp, *bp;
|
|
|
768 tp = &coffheader.scns[0];
|
|
|
769 dp = &coffheader.scns[1];
|
|
|
770 bp = &coffheader.scns[2];
|
|
|
771 tp->s_size = hdr.a_text + sizeof(struct exec);
|
|
|
772 dp->s_paddr = data_start;
|
|
|
773 dp->s_vaddr = data_start;
|
|
|
774 dp->s_size = hdr.a_data;
|
|
|
775 bp->s_paddr = dp->s_vaddr + dp->s_size;
|
|
|
776 bp->s_vaddr = bp->s_paddr;
|
|
|
777 bp->s_size = hdr.a_bss;
|
|
|
778 coffheader.tsize = tp->s_size;
|
|
|
779 coffheader.dsize = dp->s_size;
|
|
|
780 coffheader.bsize = bp->s_size;
|
|
|
781 coffheader.text_start = tp->s_vaddr;
|
|
|
782 coffheader.data_start = dp->s_vaddr;
|
|
|
783 }
|
|
647
|
784 if (write (new, &coffheader, sizeof (coffheader)) != sizeof (coffheader))
|
|
428
|
785 {
|
|
|
786 PERROR(new_name);
|
|
|
787 }
|
|
|
788 #endif /* COFF_ENCAPSULATE */
|
|
|
789
|
|
647
|
790 if (write (new, (char *) &hdr, sizeof (hdr)) != sizeof (hdr))
|
|
428
|
791 {
|
|
|
792 PERROR (new_name);
|
|
|
793 }
|
|
|
794
|
|
|
795 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
|
|
|
796 /* This adjustment was done above only #ifndef NO_REMAP,
|
|
|
797 so only undo it now #ifndef NO_REMAP. */
|
|
|
798 /* #ifndef NO_REMAP */
|
|
|
799 #endif
|
|
|
800 #ifdef A_TEXT_OFFSET
|
|
|
801 hdr.a_text -= A_TEXT_OFFSET (ohdr);
|
|
|
802 #endif
|
|
|
803
|
|
|
804 return 0;
|
|
|
805
|
|
|
806 #endif /* not COFF */
|
|
|
807 }
|
|
|
808
|
|
|
809 static void write_segment (int, char *, char *);
|
|
|
810
|
|
|
811 /* ****************************************************************
|
|
|
812 * copy_text_and_data
|
|
|
813 *
|
|
|
814 * Copy the text and data segments from memory to the new a.out
|
|
|
815 */
|
|
|
816 static int
|
|
|
817 copy_text_and_data (int new, int a_out)
|
|
|
818 {
|
|
|
819 char *end;
|
|
|
820 char *ptr;
|
|
|
821
|
|
|
822 #ifdef COFF
|
|
|
823
|
|
|
824 #ifdef USG_SHARED_LIBRARIES
|
|
|
825
|
|
|
826 int scns;
|
|
|
827 struct scnhdr scntemp; /* Temporary section header */
|
|
|
828
|
|
|
829 /* The purpose of this code is to write out the new file's section
|
|
|
830 * contents.
|
|
|
831 *
|
|
|
832 * Step through the section table. If we know the section (.text,
|
|
|
833 * .data) do the appropriate thing. Otherwise, if the section has
|
|
|
834 * no allocated space in the file (.bss), do nothing. Otherwise,
|
|
|
835 * the section has space allocated in the file, and is not a section
|
|
|
836 * we know. So just copy it.
|
|
|
837 */
|
|
|
838
|
|
|
839 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0);
|
|
|
840
|
|
|
841 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
842 {
|
|
|
843 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
844 PERROR ("temacs");
|
|
|
845
|
|
|
846 if (!strcmp (scntemp.s_name, ".text"))
|
|
|
847 {
|
|
|
848 lseek (new, (long) text_scnptr, 0);
|
|
|
849 ptr = (char *) f_ohdr.text_start;
|
|
|
850 end = ptr + f_ohdr.tsize;
|
|
|
851 write_segment (new, ptr, end);
|
|
|
852 }
|
|
|
853 else if (!strcmp (scntemp.s_name, ".data"))
|
|
|
854 {
|
|
|
855 lseek (new, (long) data_scnptr, 0);
|
|
|
856 ptr = (char *) f_ohdr.data_start;
|
|
|
857 end = ptr + f_ohdr.dsize;
|
|
|
858 write_segment (new, ptr, end);
|
|
|
859 }
|
|
|
860 else if (!scntemp.s_scnptr)
|
|
|
861 ; /* do nothing - no data for this section */
|
|
|
862 else
|
|
|
863 {
|
|
|
864 char page[BUFSIZ];
|
|
|
865 int size, n;
|
|
|
866 long old_a_out_ptr = lseek (a_out, 0, 1);
|
|
|
867
|
|
|
868 lseek (a_out, scntemp.s_scnptr, 0);
|
|
|
869 for (size = scntemp.s_size; size > 0; size -= sizeof (page))
|
|
|
870 {
|
|
|
871 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
872 if (read (a_out, page, n) != n || write (new, page, n) != n)
|
|
|
873 PERROR ("emacs");
|
|
|
874 }
|
|
|
875 lseek (a_out, old_a_out_ptr, 0);
|
|
|
876 }
|
|
|
877 }
|
|
|
878
|
|
|
879 #else /* COFF, but not USG_SHARED_LIBRARIES */
|
|
|
880
|
|
|
881 lseek (new, (long) text_scnptr, 0);
|
|
|
882 ptr = (char *) f_ohdr.text_start;
|
|
|
883 #ifdef HEADER_INCL_IN_TEXT
|
|
|
884 /* For Gould UTX/32, text starts after headers */
|
|
|
885 ptr = (char *) (ptr + text_scnptr);
|
|
|
886 #endif /* HEADER_INCL_IN_TEXT */
|
|
|
887 end = ptr + f_ohdr.tsize;
|
|
|
888 write_segment (new, ptr, end);
|
|
|
889
|
|
|
890 lseek (new, (long) data_scnptr, 0);
|
|
|
891 ptr = (char *) f_ohdr.data_start;
|
|
|
892 end = ptr + f_ohdr.dsize;
|
|
|
893 write_segment (new, ptr, end);
|
|
|
894
|
|
|
895 #endif /* USG_SHARED_LIBRARIES */
|
|
|
896
|
|
|
897 #else /* if not COFF */
|
|
|
898
|
|
|
899 /* Some machines count the header as part of the text segment.
|
|
|
900 That is to say, the header appears in core
|
|
|
901 just before the address that start_of_text returns.
|
|
|
902 For them, N_TXTOFF is the place where the header goes.
|
|
|
903 We must adjust the seek to the place after the header.
|
|
|
904 Note that at this point hdr.a_text does *not* count
|
|
|
905 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
|
|
|
906
|
|
|
907 #ifdef A_TEXT_SEEK
|
|
|
908 lseek (new, (long) A_TEXT_SEEK (hdr), 0);
|
|
|
909 #else
|
|
|
910 lseek (new, (long) N_TXTOFF (hdr), 0);
|
|
|
911 #endif /* no A_TEXT_SEEK */
|
|
|
912
|
|
|
913 #ifdef RISCiX
|
|
|
914
|
|
|
915 /* Acorn's RISC-iX has a wacky way of initializing the position of the heap.
|
|
|
916 * There is a little table in crt0.o that is filled at link time with
|
|
|
917 * the min and current brk positions, among other things. When start
|
|
|
918 * runs, it copies the table to where these parameters live during
|
|
|
919 * execution. This data is in text space, so it cannot be modified here
|
|
|
920 * before saving the executable, so the data is written manually. In
|
|
|
921 * addition, the table does not have a label, and the nearest accessible
|
|
|
922 * label (mcount) is not prefixed with a '_', thus making it inaccessible
|
|
|
923 * from within C programs. To overcome this, emacs's executable is passed
|
|
|
924 * through the command 'nm %s | fgrep mcount' into a pipe, and the
|
|
|
925 * resultant output is then used to find the address of 'mcount'. As far as
|
|
|
926 * is possible to determine, in RISC-iX releases prior to 1.2, the negative
|
|
|
927 * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
|
|
|
928 * 0x30. bss_end has been rounded up to page boundary. This solution is
|
|
|
929 * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
|
|
|
930 * avoids the need for a custom version of crt0.o for emacs which has its
|
|
|
931 * table in data space.
|
|
|
932 */
|
|
|
933
|
|
|
934 {
|
|
|
935 char command[1024];
|
|
|
936 char errbuf[1024];
|
|
|
937 char address_text[32];
|
|
|
938 int proforma[4];
|
|
|
939 FILE *pfile;
|
|
|
940 char *temp_ptr;
|
|
|
941 char c;
|
|
|
942 int mcount_address, mcount_offset, count;
|
|
|
943 extern char *_execname;
|
|
438
|
944
|
|
428
|
945
|
|
|
946 /* The use of _execname is incompatible with RISCiX 1.1 */
|
|
|
947 sprintf (command, "nm %s | fgrep mcount", _execname);
|
|
|
948
|
|
|
949 if ( (pfile = popen(command, "r")) == NULL)
|
|
|
950 {
|
|
|
951 sprintf (errbuf, "Could not open pipe");
|
|
|
952 PERROR (errbuf);
|
|
|
953 }
|
|
|
954
|
|
|
955 count=0;
|
|
|
956 while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
|
|
|
957 address_text[count++]=c;
|
|
|
958 address_text[count]=0;
|
|
|
959
|
|
|
960 if ((count == 0) || pclose(pfile) != NULL)
|
|
|
961 {
|
|
|
962 sprintf (errbuf, "Failed to execute the command '%s'\n", command);
|
|
|
963 PERROR (errbuf);
|
|
438
|
964 }
|
|
428
|
965
|
|
|
966 sscanf(address_text, "%x", &mcount_address);
|
|
|
967 ptr = (char *) unexec_text_start;
|
|
|
968 mcount_offset = (char *)mcount_address - ptr;
|
|
|
969
|
|
|
970 #ifdef RISCiX_1_1
|
|
|
971 #define EDATA_OFFSET 0x2c
|
|
|
972 #else
|
|
|
973 #define EDATA_OFFSET 0x30
|
|
|
974 #endif
|
|
|
975
|
|
|
976 end = ptr + mcount_offset - EDATA_OFFSET;
|
|
|
977
|
|
|
978 write_segment (new, ptr, end);
|
|
|
979
|
|
|
980 proforma[0] = bss_end; /* becomes _edata */
|
|
|
981 proforma[1] = bss_end; /* becomes _end */
|
|
|
982 proforma[2] = bss_end; /* becomes _minbrk */
|
|
|
983 proforma[3] = bss_end; /* becomes _curbrk */
|
|
|
984
|
|
|
985 write (new, proforma, 16);
|
|
|
986
|
|
|
987 temp_ptr = ptr;
|
|
|
988 ptr = end + 16;
|
|
|
989 end = temp_ptr + hdr.a_text;
|
|
|
990
|
|
|
991 write_segment (new, ptr, end);
|
|
|
992 }
|
|
|
993
|
|
|
994 #else /* !RISCiX */
|
|
|
995 ptr = (char *) unexec_text_start;
|
|
|
996 end = ptr + hdr.a_text;
|
|
|
997 write_segment (new, ptr, end);
|
|
|
998 #endif /* RISCiX */
|
|
|
999
|
|
|
1000 ptr = (char *) unexec_data_start;
|
|
|
1001 end = ptr + hdr.a_data;
|
|
|
1002 /* This lseek is certainly incorrect when A_TEXT_OFFSET
|
|
|
1003 and I believe it is a no-op otherwise.
|
|
|
1004 Let's see if its absence ever fails. */
|
|
|
1005 /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
|
|
|
1006 write_segment (new, ptr, end);
|
|
|
1007
|
|
|
1008 #endif /* not COFF */
|
|
|
1009
|
|
|
1010 return 0;
|
|
|
1011 }
|
|
|
1012
|
|
|
1013 static void
|
|
|
1014 write_segment (new, ptr, end)
|
|
|
1015 int new;
|
|
|
1016 char *ptr, *end;
|
|
|
1017 {
|
|
|
1018 int i, nwrite, ret;
|
|
|
1019 #if 0
|
|
|
1020 char buf[80];
|
|
|
1021 #endif
|
|
|
1022 /* This is the normal amount to write at once.
|
|
|
1023 It is the size of block that NFS uses. */
|
|
|
1024 int writesize = 1 << 13;
|
|
|
1025 int pagesize = getpagesize ();
|
|
|
1026 char zeros[1 << 13];
|
|
|
1027
|
|
|
1028 memset (zeros, 0, sizeof (zeros));
|
|
|
1029
|
|
|
1030 for (i = 0; ptr < end;)
|
|
|
1031 {
|
|
|
1032 /* Distance to next multiple of writesize. */
|
|
|
1033 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
|
|
|
1034 /* But not beyond specified end. */
|
|
|
1035 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
1036 ret = write (new, ptr, nwrite);
|
|
|
1037 /* If write gets a page fault, it means we reached
|
|
|
1038 a gap between the old text segment and the old data segment.
|
|
|
1039 This gap has probably been remapped into part of the text segment.
|
|
|
1040 So write zeros for it. */
|
|
|
1041 if (ret == -1
|
|
|
1042 #ifdef EFAULT
|
|
|
1043 && errno == EFAULT
|
|
|
1044 #endif
|
|
|
1045 )
|
|
|
1046 {
|
|
|
1047 /* Write only a page of zeros at once,
|
|
|
1048 so that we don't overshoot the start
|
|
|
1049 of the valid memory in the old data segment. */
|
|
|
1050 if (nwrite > pagesize)
|
|
|
1051 nwrite = pagesize;
|
|
|
1052 write (new, zeros, nwrite);
|
|
|
1053 }
|
|
|
1054 #if 0 /* Now that we have can ask `write' to write more than a page,
|
|
|
1055 it is legit for write do less than the whole amount specified. */
|
|
|
1056 else if (nwrite != ret)
|
|
|
1057 {
|
|
|
1058 sprintf (buf,
|
|
|
1059 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
1060 (unsigned long) ptr, new, nwrite, ret, errno);
|
|
|
1061 PERROR (buf);
|
|
|
1062 }
|
|
|
1063 #endif
|
|
|
1064 i += nwrite;
|
|
|
1065 ptr += nwrite;
|
|
|
1066 }
|
|
|
1067 }
|
|
|
1068
|
|
|
1069 /* ****************************************************************
|
|
|
1070 * copy_sym
|
|
|
1071 *
|
|
|
1072 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
1073 */
|
|
|
1074 static int
|
|
|
1075 copy_sym (int new, int a_out, char *a_name, char *new_name)
|
|
|
1076 {
|
|
|
1077 char page[1024];
|
|
|
1078 int n;
|
|
|
1079
|
|
|
1080 if (a_out < 0)
|
|
|
1081 return 0;
|
|
|
1082
|
|
|
1083 #ifdef COFF
|
|
|
1084 if (SYMS_START == 0L)
|
|
|
1085 return 0;
|
|
|
1086 #endif /* COFF */
|
|
|
1087
|
|
|
1088 #ifdef COFF
|
|
|
1089 if (lnnoptr) /* if there is line number info */
|
|
|
1090 lseek (a_out, lnnoptr, 0); /* start copying from there */
|
|
|
1091 else
|
|
|
1092 #endif /* COFF */
|
|
|
1093 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
|
|
1094
|
|
647
|
1095 while ((n = read (a_out, page, sizeof (page))) > 0)
|
|
428
|
1096 {
|
|
|
1097 if (write (new, page, n) != n)
|
|
|
1098 {
|
|
|
1099 PERROR (new_name);
|
|
|
1100 }
|
|
|
1101 }
|
|
|
1102 if (n < 0)
|
|
|
1103 {
|
|
|
1104 PERROR (a_name);
|
|
|
1105 }
|
|
|
1106 return 0;
|
|
|
1107 }
|
|
|
1108
|
|
|
1109 /* ****************************************************************
|
|
|
1110 * mark_x
|
|
|
1111 *
|
|
|
1112 * After successfully building the new a.out, mark it executable
|
|
|
1113 */
|
|
|
1114 static void
|
|
|
1115 mark_x (char *name)
|
|
|
1116 {
|
|
|
1117 struct stat sbuf;
|
|
|
1118 int um;
|
|
|
1119 int new = 0; /* for PERROR */
|
|
|
1120
|
|
|
1121 um = umask (777);
|
|
|
1122 umask (um);
|
|
|
1123 if (stat (name, &sbuf) == -1)
|
|
|
1124 {
|
|
|
1125 PERROR (name);
|
|
|
1126 }
|
|
|
1127 sbuf.st_mode |= 0111 & ~um;
|
|
|
1128 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
1129 PERROR (name);
|
|
|
1130 }
|
|
|
1131
|
|
|
1132 #ifdef COFF
|
|
|
1133 #ifndef COFF_BSD_SYMBOLS
|
|
|
1134
|
|
|
1135 /*
|
|
|
1136 * If the COFF file contains a symbol table and a line number section,
|
|
|
1137 * then any auxiliary entries that have values for x_lnnoptr must
|
|
|
1138 * be adjusted by the amount that the line number section has moved
|
|
|
1139 * in the file (bias computed in make_hdr). The #@$%&* designers of
|
|
|
1140 * the auxiliary entry structures used the absolute file offsets for
|
|
|
1141 * the line number entry rather than an offset from the start of the
|
|
|
1142 * line number section!
|
|
|
1143 *
|
|
|
1144 * When I figure out how to scan through the symbol table and pick out
|
|
|
1145 * the auxiliary entries that need adjustment, this routine will
|
|
|
1146 * be fixed. As it is now, all such entries are wrong and sdb
|
|
|
1147 * will complain. Fred Fish, UniSoft Systems Inc.
|
|
|
1148 */
|
|
|
1149
|
|
|
1150 /* This function is probably very slow. Instead of reopening the new
|
|
|
1151 file for input and output it should copy from the old to the new
|
|
|
1152 using the two descriptors already open (WRITEDESC and READDESC).
|
|
|
1153 Instead of reading one small structure at a time it should use
|
|
|
1154 a reasonable size buffer. But I don't have time to work on such
|
|
|
1155 things, so I am installing it as submitted to me. -- RMS. */
|
|
|
1156
|
|
|
1157 int
|
|
|
1158 adjust_lnnoptrs (writedesc, readdesc, new_name)
|
|
|
1159 int writedesc;
|
|
|
1160 int readdesc;
|
|
|
1161 char *new_name;
|
|
|
1162 {
|
|
|
1163 int nsyms;
|
|
|
1164 int new;
|
|
|
1165 #if defined (amdahl_uts) || defined (pfa)
|
|
|
1166 SYMENT symentry;
|
|
|
1167 AUXENT auxentry;
|
|
|
1168 #else
|
|
|
1169 struct syment symentry;
|
|
|
1170 union auxent auxentry;
|
|
|
1171 #endif
|
|
|
1172
|
|
|
1173 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
1174 return 0;
|
|
|
1175
|
|
|
1176 if ((new = open (new_name, O_RDWR)) < 0)
|
|
|
1177 {
|
|
|
1178 PERROR (new_name);
|
|
|
1179 return -1;
|
|
|
1180 }
|
|
|
1181
|
|
|
1182 lseek (new, f_hdr.f_symptr, 0);
|
|
|
1183 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
1184 {
|
|
|
1185 read (new, &symentry, SYMESZ);
|
|
|
1186 if (symentry.n_numaux)
|
|
|
1187 {
|
|
|
1188 read (new, &auxentry, AUXESZ);
|
|
|
1189 nsyms++;
|
|
|
1190 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400)
|
|
|
1191 {
|
|
|
1192 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
|
1193 lseek (new, -AUXESZ, 1);
|
|
|
1194 write (new, &auxentry, AUXESZ);
|
|
|
1195 }
|
|
|
1196 }
|
|
|
1197 }
|
|
|
1198 close (new);
|
|
|
1199 return 0;
|
|
|
1200 }
|
|
|
1201
|
|
|
1202 #endif /* COFF_BSD_SYMBOLS */
|
|
|
1203
|
|
|
1204 #endif /* COFF */
|
|
|
1205
|
|
|
1206 #endif /* not CANNOT_DUMP */
|
