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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994
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2 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.31. */
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22
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23 /*
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24 * unexec.c - Convert a running program into an a.out file.
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25 *
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26 * Author: Spencer W. Thomas
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27 * Computer Science Dept.
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28 * University of Utah
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29 * Date: Tue Mar 2 1982
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30 * Modified heavily since then.
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31 *
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32 * Synopsis:
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33 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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34 * char *new_name, *a_name;
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35 * unsigned data_start, bss_start, entry_address;
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36 *
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37 * Takes a snapshot of the program and makes an a.out format file in the
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38 * file named by the string argument new_name.
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39 * If a_name is non-NULL, the symbol table will be taken from the given file.
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40 * On some machines, an existing a_name file is required.
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41 *
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42 * The boundaries within the a.out file may be adjusted with the data_start
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43 * and bss_start arguments. Either or both may be given as 0 for defaults.
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44 *
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45 * Data_start gives the boundary between the text segment and the data
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46 * segment of the program. The text segment can contain shared, read-only
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47 * program code and literal data, while the data segment is always unshared
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48 * and unprotected. Data_start gives the lowest unprotected address.
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49 * The value you specify may be rounded down to a suitable boundary
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50 * as required by the machine you are using.
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51 *
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52 * Specifying zero for data_start means the boundary between text and data
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53 * should not be the same as when the program was loaded.
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54 * If NO_REMAP is defined, the argument data_start is ignored and the
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55 * segment boundaries are never changed.
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56 *
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57 * Bss_start indicates how much of the data segment is to be saved in the
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58 * a.out file and restored when the program is executed. It gives the lowest
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59 * unsaved address, and is rounded up to a page boundary. The default when 0
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60 * is given assumes that the entire data segment is to be stored, including
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61 * the previous data and bss as well as any additional storage allocated with
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62 * break (2).
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63 *
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64 * The new file is set up to start at entry_address.
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65 *
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66 * If you make improvements I'd like to get them too.
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67 * harpo!utah-cs!thomas, thomas@Utah-20
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68 *
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69 */
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70
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71 /* Modified to support SysVr3 shared libraries by James Van Artsdalen
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72 * of Dell Computer Corporation. james@bigtex.cactus.org.
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73 */
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74
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75 /* There are several compilation parameters affecting unexec:
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76
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77 * COFF
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78
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79 Define this if your system uses COFF for executables.
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80
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81 * COFF_ENCAPSULATE
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82
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83 Define this if you are using the GNU coff encapsulated a.out format.
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84 This is closer to a.out than COFF. You should *not* define COFF if
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85 you define COFF_ENCAPSULATE
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86
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87 Otherwise we assume you use Berkeley format.
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88
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89 * NO_REMAP
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90
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91 Define this if you do not want to try to save Emacs's pure data areas
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92 as part of the text segment.
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93
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94 Saving them as text is good because it allows users to share more.
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95
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96 However, on machines that locate the text area far from the data area,
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97 the boundary cannot feasibly be moved. Such machines require
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98 NO_REMAP.
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99
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100 Also, remapping can cause trouble with the built-in startup routine
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101 /lib/crt0.o, which defines `environ' as an initialized variable.
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102 Dumping `environ' as pure does not work! So, to use remapping,
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103 you must write a startup routine for your machine in Emacs's crt0.c.
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104 If NO_REMAP is defined, Emacs uses the system's crt0.o.
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105
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106 * SECTION_ALIGNMENT
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107
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108 Some machines that use COFF executables require that each section
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109 start on a certain boundary *in the COFF file*. Such machines should
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110 define SECTION_ALIGNMENT to a mask of the low-order bits that must be
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111 zero on such a boundary. This mask is used to control padding between
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112 segments in the COFF file.
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113
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114 If SECTION_ALIGNMENT is not defined, the segments are written
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115 consecutively with no attempt at alignment. This is right for
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116 unmodified system V.
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117
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118 * SEGMENT_MASK
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119
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120 Some machines require that the beginnings and ends of segments
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121 *in core* be on certain boundaries. For most machines, a page
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122 boundary is sufficient. That is the default. When a larger
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123 boundary is needed, define SEGMENT_MASK to a mask of
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124 the bits that must be zero on such a boundary.
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125
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126 * A_TEXT_OFFSET(HDR)
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127
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128 Some machines count the a.out header as part of the size of the text
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129 segment (a_text); they may actually load the header into core as the
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130 first data in the text segment. Some have additional padding between
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131 the header and the real text of the program that is counted in a_text.
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132
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133 For these machines, define A_TEXT_OFFSET(HDR) to examine the header
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134 structure HDR and return the number of bytes to add to `a_text'
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135 before writing it (above and beyond the number of bytes of actual
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136 program text). HDR's standard fields are already correct, except that
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137 this adjustment to the `a_text' field has not yet been made;
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138 thus, the amount of offset can depend on the data in the file.
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139
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140 * A_TEXT_SEEK(HDR)
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141
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142 If defined, this macro specifies the number of bytes to seek into the
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143 a.out file before starting to write the text segment.
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144
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145 * EXEC_MAGIC
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146
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147 For machines using COFF, this macro, if defined, is a value stored
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148 into the magic number field of the output file.
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149
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150 * ADJUST_EXEC_HEADER
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151
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152 This macro can be used to generate statements to adjust or
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153 initialize nonstandard fields in the file header
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154
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155 * ADDR_CORRECT(ADDR)
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156
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157 Macro to correct an int which is the bit pattern of a pointer to a byte
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158 into an int which is the number of a byte.
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159
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160 This macro has a default definition which is usually right.
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161 This default definition is a no-op on most machines (where a
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162 pointer looks like an int) but not on all machines.
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163
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164 */
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165
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166 #ifndef emacs
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167 #define PERROR(arg) perror (arg); return -1
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168 #else
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169 #define IN_UNEXEC
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170 #define DONT_ENCAPSULATE /* we include lisp.h so we want to make sure we
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171 don't get filename conversion. The caller
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172 of unexec() is assumed to have done this
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173 already (it's easier to do it this way than
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174 to modify all the unexec modules to ensure
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175 that all weirdo functions, such as
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176 elf_write_modified_data(), have proper
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177 filename conversion applied). */
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178 #include <config.h>
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179 #define PERROR(file) report_error (file, new)
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180 #endif
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181
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182 #if __STDC__ || defined(STDC_HEADERS)
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183
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184 /* I don't know how correct this attempt to get more prototypes is... */
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185 # if defined(sun) && defined(_POSIX_SOURCE)
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186 # undef _POSIX_SOURCE
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187 # endif
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188
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189 # if defined(__lucid) && !defined(__STDC_EXTENDED__)
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190 # define __STDC_EXTENDED__ 1
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191 # endif
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192
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193 # include <stdlib.h>
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194 # include <unistd.h>
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195 # include <string.h>
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196
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197 # ifdef __lucid
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198 # include <sysent.h>
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199 # endif
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200
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201 #endif
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202
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203 /* I don't understand this, but it's necessary to get some slots in struct exec
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204 from /usr/include/sys/exec.h when running LCC in strict ANSI mode. We don't
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205 need this in K&R mode...
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206 */
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207 #if defined(__lucid) && defined(__sparc) && !defined(sun)
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208 # define sun 1
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209 #endif
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210
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211 #ifndef CANNOT_DUMP /* all rest of file! */
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212
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213 #ifdef COFF_ENCAPSULATE
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214 int need_coff_header = 1;
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215 #include <coff-encap/a.out.encap.h> /* The location might be a poor assumption */
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216 #else
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217 #ifdef MSDOS
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218 #if __DJGPP__ > 1
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219 #include <fcntl.h> /* for O_RDONLY, O_RDWR */
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220 #endif
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221 #include <coff.h>
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222 #define filehdr external_filehdr
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223 #define scnhdr external_scnhdr
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224 #define syment external_syment
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225 #define auxent external_auxent
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226 #define n_numaux e_numaux
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227 #define n_type e_type
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228 struct aouthdr
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229 {
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230 unsigned short magic; /* type of file */
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231 unsigned short vstamp; /* version stamp */
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232 unsigned long tsize; /* text size in bytes, padded to FW bdry*/
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233 unsigned long dsize; /* initialized data " " */
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234 unsigned long bsize; /* uninitialized data " " */
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235 unsigned long entry; /* entry pt. */
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236 unsigned long text_start;/* base of text used for this file */
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237 unsigned long data_start;/* base of data used for this file */
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238 };
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239
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240
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241 #else /* not MSDOS */
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242 #include <a.out.h>
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243 #endif /* not MSDOS */
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244 #endif /* not COFF_ENCAPSULATE */
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245
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246 /* Define getpagesize if the system does not.
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247 Note that this may depend on symbols defined in a.out.h. */
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248 #include "getpagesize.h"
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249
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250 #ifndef makedev /* Try to detect types.h already loaded */
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251 #include <sys/types.h>
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252 #endif /* makedev */
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253 #include <stdio.h>
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254 #include <sys/stat.h>
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255 #include <errno.h>
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256
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257 #include <sys/file.h> /* Must be after sys/types.h for USG and BSD4_1*/
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258
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259 #ifdef USG5
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260 #include <fcntl.h>
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261 #endif
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262
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263 #ifndef O_RDONLY
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264 #define O_RDONLY 0
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265 #endif
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266 #ifndef O_RDWR
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267 #define O_RDWR 2
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268 #endif
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269
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270
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271 extern char *start_of_text (); /* Start of text */
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272
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273 extern void *start_of_data (); /* Start of initialized data */
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274
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275 #ifdef COFF
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276 static long block_copy_start; /* Old executable start point */
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277 static struct filehdr f_hdr; /* File header */
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278 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
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279 long bias; /* Bias to add for growth */
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280 long lnnoptr; /* Pointer to line-number info within file */
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281 #define SYMS_START block_copy_start
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282
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283 static long text_scnptr;
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284 static long data_scnptr;
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285
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286 #else /* not COFF */
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287
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288 #ifdef __STDC__
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289 #ifndef __sys_stdtypes_h
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290 #ifndef _PTRDIFF_T
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291 typedef long ptrdiff_t;
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292 #endif
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293 #endif
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294 #ifndef HPUX
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295 /* not sure where this for NetBSD should really go
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296 and it probably applies to other systems */
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297 #if !defined(__NetBSD__) && !defined(__bsdi__)
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298 extern void *sbrk (ptrdiff_t);
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299 #else
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300 extern char *sbrk ();
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301 #endif /* __NetBSD__ */
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302 #endif /* HPUX */
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303 #else
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304 extern void *sbrk ();
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305 #endif
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306
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307 #define SYMS_START ((long) N_SYMOFF (ohdr))
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308
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309 /* Some machines override the structure name for an a.out header. */
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310 #ifndef EXEC_HDR_TYPE
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311 #define EXEC_HDR_TYPE struct exec
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312 #endif
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313
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314 #ifdef HPUX
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315 #ifdef HP9000S200_ID
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316 #define MY_ID HP9000S200_ID
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317 #else
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318 #include <model.h>
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319 #define MY_ID MYSYS
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320 #endif /* no HP9000S200_ID */
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321 static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
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322 static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
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323 #define N_TXTOFF(x) TEXT_OFFSET(x)
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324 #define N_SYMOFF(x) LESYM_OFFSET(x)
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325 static EXEC_HDR_TYPE hdr, ohdr;
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326
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327 #else /* not HPUX */
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328
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329 #if defined (USG) && !defined (IBMAIX) && !defined (IRIS) && !defined (COFF_ENCAPSULATE) && !defined (LINUX)
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330 static struct bhdr hdr, ohdr;
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331 #define a_magic fmagic
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332 #define a_text tsize
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333 #define a_data dsize
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334 #define a_bss bsize
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335 #define a_syms ssize
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336 #define a_trsize rtsize
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337 #define a_drsize rdsize
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338 #define a_entry entry
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339 #define N_BADMAG(x) \
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340 (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
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341 ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
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342 #define NEWMAGIC FMAGIC
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343 #else /* IRIS or IBMAIX or not USG */
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344 static EXEC_HDR_TYPE hdr, ohdr;
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345 #define NEWMAGIC ZMAGIC
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346 #endif /* IRIS or IBMAIX not USG */
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347 #endif /* not HPUX */
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348
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349 static int unexec_text_start;
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350 static int unexec_data_start;
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351
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352 #ifdef COFF_ENCAPSULATE
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353 /* coffheader is defined in the GNU a.out.encap.h file. */
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354 struct coffheader coffheader;
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355 #endif
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356
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357 #endif /* not COFF */
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358
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359 static int pagemask;
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360
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361 /* Correct an int which is the bit pattern of a pointer to a byte
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362 into an int which is the number of a byte.
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363 This is a no-op on ordinary machines, but not on all. */
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364
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365 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
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366 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
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367 #endif
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368
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369 #ifdef emacs
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370
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371 #include "lisp.h"
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372
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373 static void
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374 report_error (file, fd)
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375 CONST char *file;
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376 int fd;
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377 {
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378 if (fd)
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379 close (fd);
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380 report_file_error ("Cannot unexec",
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381 Fcons (build_ext_string (file, FORMAT_FILENAME), Qnil));
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382 }
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383 #endif /* emacs */
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384
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385 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
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386 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
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387 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
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388
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389 static void
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390 report_error_1 (fd, msg, a1, a2)
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391 int fd;
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392 CONST char *msg;
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393 int a1, a2;
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394 {
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395 close (fd);
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396 #ifdef emacs
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397 error (msg, a1, a2);
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398 #else
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399 fprintf (stderr, msg, a1, a2);
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400 fprintf (stderr, "\n");
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401 #endif
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402 }
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|
403
|
|
|
404 static int make_hdr (int new, int a_out, unsigned data_start,
|
|
|
405 unsigned bss_start, unsigned entry_address,
|
|
|
406 char *a_name, char *new_name);
|
|
|
407 static int copy_text_and_data (int new, int a_out);
|
|
|
408 static int copy_sym (int new, int a_out, char *a_name, char *new_name);
|
|
|
409 static void mark_x (char *name);
|
|
|
410
|
|
|
411 /* ****************************************************************
|
|
|
412 * unexec
|
|
|
413 *
|
|
|
414 * driving logic.
|
|
|
415 */
|
|
|
416 int
|
|
|
417 unexec (new_name, a_name, data_start, bss_start, entry_address)
|
|
|
418 char *new_name, *a_name;
|
|
|
419 unsigned data_start, bss_start, entry_address;
|
|
|
420 {
|
|
|
421 int new, a_out = -1;
|
|
|
422
|
|
|
423 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
|
|
|
424 {
|
|
|
425 PERROR (a_name);
|
|
|
426 }
|
|
|
427 if ((new = creat (new_name, 0666)) < 0)
|
|
|
428 {
|
|
|
429 PERROR (new_name);
|
|
|
430 }
|
|
|
431
|
|
|
432 if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
|
|
|
433 || copy_text_and_data (new, a_out) < 0
|
|
|
434 || copy_sym (new, a_out, a_name, new_name) < 0
|
|
|
435 #ifdef COFF
|
|
|
436 #ifndef COFF_BSD_SYMBOLS
|
|
|
437 || adjust_lnnoptrs (new, a_out, new_name) < 0
|
|
|
438 #endif
|
|
|
439 #endif
|
|
|
440 )
|
|
|
441 {
|
|
|
442 close (new);
|
|
|
443 /* unlink (new_name); / * Failed, unlink new a.out */
|
|
|
444 return -1;
|
|
|
445 }
|
|
|
446
|
|
|
447 close (new);
|
|
|
448 if (a_out >= 0)
|
|
|
449 close (a_out);
|
|
|
450 mark_x (new_name);
|
|
|
451 return 0;
|
|
|
452 }
|
|
|
453
|
|
|
454 /* ****************************************************************
|
|
|
455 * make_hdr
|
|
|
456 *
|
|
|
457 * Make the header in the new a.out from the header in core.
|
|
|
458 * Modify the text and data sizes.
|
|
|
459 */
|
|
|
460 static int
|
|
|
461 make_hdr (int new, int a_out, unsigned data_start, unsigned bss_start,
|
|
|
462 unsigned entry_address, char *a_name, char *new_name)
|
|
|
463 {
|
|
|
464 #ifdef COFF
|
|
|
465 auto struct scnhdr f_thdr; /* Text section header */
|
|
|
466 auto struct scnhdr f_dhdr; /* Data section header */
|
|
|
467 auto struct scnhdr f_bhdr; /* Bss section header */
|
|
|
468 auto struct scnhdr scntemp; /* Temporary section header */
|
|
|
469 int scns;
|
|
|
470 #endif /* COFF */
|
|
|
471 #ifdef USG_SHARED_LIBRARIES
|
|
|
472 extern unsigned int bss_end;
|
|
|
473 #else
|
|
|
474 unsigned int bss_end;
|
|
|
475 #endif
|
|
|
476
|
|
|
477 pagemask = getpagesize () - 1;
|
|
|
478
|
|
|
479 /* Adjust text/data boundary. */
|
|
|
480 #ifdef NO_REMAP
|
|
|
481 data_start = (int) start_of_data ();
|
|
|
482 #else /* not NO_REMAP */
|
|
|
483 if (!data_start)
|
|
|
484 data_start = (int) start_of_data ();
|
|
|
485 #endif /* not NO_REMAP */
|
|
|
486 data_start = ADDR_CORRECT (data_start);
|
|
|
487
|
|
|
488 #ifdef SEGMENT_MASK
|
|
|
489 data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
|
|
|
490 #else
|
|
|
491 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
|
|
|
492 #endif
|
|
|
493
|
|
|
494 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
|
|
|
495 bss_end &= ~ pagemask;
|
|
|
496
|
|
|
497 /* Adjust data/bss boundary. */
|
|
|
498 if (bss_start != 0)
|
|
|
499 {
|
|
|
500 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
|
|
|
501 /* (Up) to page bdry. */
|
|
|
502 bss_start &= ~ pagemask;
|
|
|
503 if (bss_start > bss_end)
|
|
|
504 {
|
|
|
505 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
|
|
|
506 bss_start);
|
|
|
507 }
|
|
|
508 }
|
|
|
509 else
|
|
|
510 bss_start = bss_end;
|
|
|
511
|
|
|
512 if (data_start > bss_start) /* Can't have negative data size. */
|
|
|
513 {
|
|
|
514 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
|
|
|
515 data_start, bss_start);
|
|
|
516 }
|
|
|
517
|
|
|
518 #ifdef COFF
|
|
|
519 /* Salvage as much info from the existing file as possible */
|
|
|
520 if (a_out >= 0)
|
|
|
521 {
|
|
|
522 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
523 {
|
|
|
524 PERROR (a_name);
|
|
|
525 }
|
|
|
526 block_copy_start += sizeof (f_hdr);
|
|
|
527 if (f_hdr.f_opthdr > 0)
|
|
|
528 {
|
|
|
529 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
530 {
|
|
|
531 PERROR (a_name);
|
|
|
532 }
|
|
|
533 block_copy_start += sizeof (f_ohdr);
|
|
|
534 }
|
|
|
535 /* Loop through section headers, copying them in */
|
|
|
536 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
537 for (scns = f_hdr.f_nscns; scns > 0; scns--) {
|
|
|
538 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
539 {
|
|
|
540 PERROR (a_name);
|
|
|
541 }
|
|
|
542 if (scntemp.s_scnptr > 0L)
|
|
|
543 {
|
|
|
544 if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
|
|
|
545 block_copy_start = scntemp.s_scnptr + scntemp.s_size;
|
|
|
546 }
|
|
|
547 if (strcmp (scntemp.s_name, ".text") == 0)
|
|
|
548 {
|
|
|
549 f_thdr = scntemp;
|
|
|
550 }
|
|
|
551 else if (strcmp (scntemp.s_name, ".data") == 0)
|
|
|
552 {
|
|
|
553 f_dhdr = scntemp;
|
|
|
554 }
|
|
|
555 else if (strcmp (scntemp.s_name, ".bss") == 0)
|
|
|
556 {
|
|
|
557 f_bhdr = scntemp;
|
|
|
558 }
|
|
|
559 }
|
|
|
560 }
|
|
|
561 else
|
|
|
562 {
|
|
|
563 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
564 }
|
|
|
565
|
|
|
566 /* Now we alter the contents of all the f_*hdr variables
|
|
|
567 to correspond to what we want to dump. */
|
|
|
568
|
|
|
569 #ifdef USG_SHARED_LIBRARIES
|
|
|
570
|
|
|
571 /* The amount of data we're adding to the file is distance from the
|
|
|
572 * end of the original .data space to the current end of the .data
|
|
|
573 * space.
|
|
|
574 */
|
|
|
575
|
|
|
576 bias = bss_start - (f_ohdr.data_start + f_dhdr.s_size);
|
|
|
577
|
|
|
578 #endif
|
|
|
579
|
|
|
580 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
|
|
|
581 #ifdef TPIX
|
|
|
582 f_hdr.f_nscns = 3;
|
|
|
583 #endif
|
|
|
584 #ifdef EXEC_MAGIC
|
|
|
585 f_ohdr.magic = EXEC_MAGIC;
|
|
|
586 #endif
|
|
|
587 #ifndef NO_REMAP
|
|
|
588 f_ohdr.text_start = (long) start_of_text ();
|
|
|
589 f_ohdr.tsize = data_start - f_ohdr.text_start;
|
|
|
590 f_ohdr.data_start = data_start;
|
|
|
591 #endif /* NO_REMAP */
|
|
|
592 f_ohdr.dsize = bss_start - f_ohdr.data_start;
|
|
|
593 f_ohdr.bsize = bss_end - bss_start;
|
|
|
594 #ifndef KEEP_OLD_TEXT_SCNPTR
|
|
|
595 /* On some machines, the old values are right.
|
|
|
596 ??? Maybe on all machines with NO_REMAP. */
|
|
|
597 f_thdr.s_size = f_ohdr.tsize;
|
|
|
598 f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
|
|
|
599 f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
600 #endif /* KEEP_OLD_TEXT_SCNPTR */
|
|
|
601 #ifdef ADJUST_TEXT_SCNHDR_SIZE
|
|
|
602 /* On some machines, `text size' includes all headers. */
|
|
|
603 f_thdr.s_size -= f_thdr.s_scnptr;
|
|
|
604 #endif /* ADJUST_TEST_SCNHDR_SIZE */
|
|
|
605 lnnoptr = f_thdr.s_lnnoptr;
|
|
|
606 #ifdef SECTION_ALIGNMENT
|
|
|
607 /* Some systems require special alignment
|
|
|
608 of the sections in the file itself. */
|
|
|
609 f_thdr.s_scnptr
|
|
|
610 = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
611 #endif /* SECTION_ALIGNMENT */
|
|
|
612 #ifdef TPIX
|
|
|
613 f_thdr.s_scnptr = 0xd0;
|
|
|
614 #endif
|
|
|
615 text_scnptr = f_thdr.s_scnptr;
|
|
|
616 #ifdef ADJUST_TEXTBASE
|
|
|
617 text_scnptr = sizeof (f_hdr) + sizeof (f_ohdr) + (f_hdr.f_nscns) * (sizeof (f_thdr));
|
|
|
618 #endif
|
|
|
619 #ifndef KEEP_OLD_PADDR
|
|
|
620 f_dhdr.s_paddr = f_ohdr.data_start;
|
|
|
621 #endif /* KEEP_OLD_PADDR */
|
|
|
622 f_dhdr.s_vaddr = f_ohdr.data_start;
|
|
|
623 f_dhdr.s_size = f_ohdr.dsize;
|
|
|
624 f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
|
|
|
625 #ifdef SECTION_ALIGNMENT
|
|
|
626 /* Some systems require special alignment
|
|
|
627 of the sections in the file itself. */
|
|
|
628 f_dhdr.s_scnptr
|
|
|
629 = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
|
|
|
630 #endif /* SECTION_ALIGNMENT */
|
|
|
631 #ifdef DATA_SECTION_ALIGNMENT
|
|
|
632 /* Some systems require special alignment
|
|
|
633 of the data section only. */
|
|
|
634 f_dhdr.s_scnptr
|
|
|
635 = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
|
|
|
636 #endif /* DATA_SECTION_ALIGNMENT */
|
|
|
637 data_scnptr = f_dhdr.s_scnptr;
|
|
|
638 #ifndef KEEP_OLD_PADDR
|
|
|
639 f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
640 #endif /* KEEP_OLD_PADDR */
|
|
|
641 f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
642 f_bhdr.s_size = f_ohdr.bsize;
|
|
|
643 f_bhdr.s_scnptr = 0L;
|
|
|
644 #ifndef USG_SHARED_LIBRARIES
|
|
|
645 bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
|
|
|
646 #endif
|
|
|
647
|
|
|
648 if (f_hdr.f_symptr > 0L)
|
|
|
649 {
|
|
|
650 f_hdr.f_symptr += bias;
|
|
|
651 }
|
|
|
652
|
|
|
653 if (f_thdr.s_lnnoptr > 0L)
|
|
|
654 {
|
|
|
655 f_thdr.s_lnnoptr += bias;
|
|
|
656 }
|
|
|
657
|
|
|
658 #ifdef ADJUST_EXEC_HEADER
|
|
|
659 ADJUST_EXEC_HEADER;
|
|
|
660 #endif /* ADJUST_EXEC_HEADER */
|
|
|
661
|
|
|
662 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
663 {
|
|
|
664 PERROR (new_name);
|
|
|
665 }
|
|
|
666
|
|
|
667 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
668 {
|
|
|
669 PERROR (new_name);
|
|
|
670 }
|
|
|
671
|
|
|
672 #ifndef USG_SHARED_LIBRARIES
|
|
|
673
|
|
|
674 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
675 {
|
|
|
676 PERROR (new_name);
|
|
|
677 }
|
|
|
678
|
|
|
679 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
680 {
|
|
|
681 PERROR (new_name);
|
|
|
682 }
|
|
|
683
|
|
|
684 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
685 {
|
|
|
686 PERROR (new_name);
|
|
|
687 }
|
|
|
688
|
|
|
689 #else /* USG_SHARED_LIBRARIES */
|
|
|
690
|
|
|
691 /* The purpose of this code is to write out the new file's section
|
|
|
692 * header table.
|
|
|
693 *
|
|
|
694 * Scan through the original file's sections. If the encountered
|
|
|
695 * section is one we know (.text, .data or .bss), write out the
|
|
|
696 * correct header. If it is a section we do not know (such as
|
|
|
697 * .lib), adjust the address of where the section data is in the
|
|
|
698 * file, and write out the header.
|
|
|
699 *
|
|
|
700 * If any section precedes .text or .data in the file, this code
|
|
|
701 * will not adjust the file pointer for that section correctly.
|
|
|
702 */
|
|
|
703
|
|
|
704 /* This used to use sizeof (f_ohdr) instead of .f_opthdr.
|
|
|
705 .f_opthdr is said to be right when there is no optional header. */
|
|
|
706 lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
|
|
|
707
|
|
|
708 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
709 {
|
|
|
710 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
711 PERROR (a_name);
|
|
|
712
|
|
|
713 if (!strcmp (scntemp.s_name, f_thdr.s_name)) /* .text */
|
|
|
714 {
|
|
|
715 if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
|
|
|
716 PERROR (new_name);
|
|
|
717 }
|
|
|
718 else if (!strcmp (scntemp.s_name, f_dhdr.s_name)) /* .data */
|
|
|
719 {
|
|
|
720 if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
|
|
|
721 PERROR (new_name);
|
|
|
722 }
|
|
|
723 else if (!strcmp (scntemp.s_name, f_bhdr.s_name)) /* .bss */
|
|
|
724 {
|
|
|
725 if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
|
|
|
726 PERROR (new_name);
|
|
|
727 }
|
|
|
728 else
|
|
|
729 {
|
|
|
730 if (scntemp.s_scnptr)
|
|
|
731 scntemp.s_scnptr += bias;
|
|
|
732 if (write (new, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
733 PERROR (new_name);
|
|
|
734 }
|
|
|
735 }
|
|
|
736 #endif /* USG_SHARED_LIBRARIES */
|
|
|
737
|
|
|
738 return (0);
|
|
|
739
|
|
|
740 #else /* if not COFF */
|
|
|
741
|
|
|
742 /* Get symbol table info from header of a.out file if given one. */
|
|
|
743 if (a_out >= 0)
|
|
|
744 {
|
|
|
745 #ifdef COFF_ENCAPSULATE
|
|
|
746 if (read (a_out, &coffheader, sizeof coffheader) != sizeof coffheader)
|
|
|
747 {
|
|
|
748 PERROR(a_name);
|
|
|
749 }
|
|
|
750 if (coffheader.f_magic != COFF_MAGIC)
|
|
|
751 {
|
|
|
752 ERROR1("%s doesn't have legal coff magic number\n", a_name);
|
|
|
753 }
|
|
|
754 #endif
|
|
|
755 if (read (a_out, (char *) &ohdr, sizeof hdr) != sizeof hdr)
|
|
|
756 {
|
|
|
757 PERROR (a_name);
|
|
|
758 }
|
|
|
759
|
|
|
760 if (N_BADMAG (ohdr))
|
|
|
761 {
|
|
|
762 ERROR1 ("invalid magic number in %s", a_name);
|
|
|
763 }
|
|
|
764 hdr = ohdr;
|
|
|
765 }
|
|
|
766 else
|
|
|
767 {
|
|
|
768 #ifdef COFF_ENCAPSULATE
|
|
|
769 /* We probably could without too much trouble. The code is in gld
|
|
|
770 * but I don't have that much time or incentive.
|
|
|
771 */
|
|
|
772 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
773 #else
|
|
|
774 memset ((void *)&hdr, 0, sizeof hdr);
|
|
|
775 #endif
|
|
|
776 }
|
|
|
777
|
|
|
778 unexec_text_start = (long) start_of_text ();
|
|
|
779 unexec_data_start = data_start;
|
|
|
780
|
|
|
781 /* Machine-dependent fixup for header, or maybe for unexec_text_start */
|
|
|
782 #ifdef ADJUST_EXEC_HEADER
|
|
|
783 ADJUST_EXEC_HEADER;
|
|
|
784 #endif /* ADJUST_EXEC_HEADER */
|
|
|
785
|
|
|
786 hdr.a_trsize = 0;
|
|
|
787 hdr.a_drsize = 0;
|
|
|
788 if (entry_address != 0)
|
|
|
789 hdr.a_entry = entry_address;
|
|
|
790
|
|
|
791 hdr.a_bss = bss_end - bss_start;
|
|
|
792 hdr.a_data = bss_start - data_start;
|
|
|
793 #ifdef NO_REMAP
|
|
|
794 hdr.a_text = ohdr.a_text;
|
|
|
795 #else /* not NO_REMAP */
|
|
|
796 hdr.a_text = data_start - unexec_text_start;
|
|
|
797
|
|
|
798 #ifdef A_TEXT_OFFSET
|
|
|
799 hdr.a_text += A_TEXT_OFFSET (ohdr);
|
|
|
800 #endif
|
|
|
801
|
|
|
802 #endif /* not NO_REMAP */
|
|
|
803
|
|
|
804 #ifdef COFF_ENCAPSULATE
|
|
|
805 /* We are encapsulating BSD format within COFF format. */
|
|
|
806 {
|
|
|
807 struct coffscn *tp, *dp, *bp;
|
|
|
808 tp = &coffheader.scns[0];
|
|
|
809 dp = &coffheader.scns[1];
|
|
|
810 bp = &coffheader.scns[2];
|
|
|
811 tp->s_size = hdr.a_text + sizeof(struct exec);
|
|
|
812 dp->s_paddr = data_start;
|
|
|
813 dp->s_vaddr = data_start;
|
|
|
814 dp->s_size = hdr.a_data;
|
|
|
815 bp->s_paddr = dp->s_vaddr + dp->s_size;
|
|
|
816 bp->s_vaddr = bp->s_paddr;
|
|
|
817 bp->s_size = hdr.a_bss;
|
|
|
818 coffheader.tsize = tp->s_size;
|
|
|
819 coffheader.dsize = dp->s_size;
|
|
|
820 coffheader.bsize = bp->s_size;
|
|
|
821 coffheader.text_start = tp->s_vaddr;
|
|
|
822 coffheader.data_start = dp->s_vaddr;
|
|
|
823 }
|
|
|
824 if (write (new, &coffheader, sizeof coffheader) != sizeof coffheader)
|
|
|
825 {
|
|
|
826 PERROR(new_name);
|
|
|
827 }
|
|
|
828 #endif /* COFF_ENCAPSULATE */
|
|
|
829
|
|
|
830 if (write (new, (char *) &hdr, sizeof hdr) != sizeof hdr)
|
|
|
831 {
|
|
|
832 PERROR (new_name);
|
|
|
833 }
|
|
|
834
|
|
|
835 #if 0 /* This #ifndef caused a bug on Linux when using QMAGIC. */
|
|
|
836 /* This adjustment was done above only #ifndef NO_REMAP,
|
|
|
837 so only undo it now #ifndef NO_REMAP. */
|
|
|
838 /* #ifndef NO_REMAP */
|
|
|
839 #endif
|
|
|
840 #ifdef A_TEXT_OFFSET
|
|
|
841 hdr.a_text -= A_TEXT_OFFSET (ohdr);
|
|
|
842 #endif
|
|
|
843
|
|
|
844 return 0;
|
|
|
845
|
|
|
846 #endif /* not COFF */
|
|
|
847 }
|
|
|
848
|
|
|
849 static void write_segment (int, char *, char *);
|
|
|
850
|
|
|
851 /* ****************************************************************
|
|
|
852 * copy_text_and_data
|
|
|
853 *
|
|
|
854 * Copy the text and data segments from memory to the new a.out
|
|
|
855 */
|
|
|
856 static int
|
|
|
857 copy_text_and_data (int new, int a_out)
|
|
|
858 {
|
|
|
859 char *end;
|
|
|
860 char *ptr;
|
|
|
861
|
|
|
862 #ifdef COFF
|
|
|
863
|
|
|
864 #ifdef USG_SHARED_LIBRARIES
|
|
|
865
|
|
|
866 int scns;
|
|
|
867 struct scnhdr scntemp; /* Temporary section header */
|
|
|
868
|
|
|
869 /* The purpose of this code is to write out the new file's section
|
|
|
870 * contents.
|
|
|
871 *
|
|
|
872 * Step through the section table. If we know the section (.text,
|
|
|
873 * .data) do the appropriate thing. Otherwise, if the section has
|
|
|
874 * no allocated space in the file (.bss), do nothing. Otherwise,
|
|
|
875 * the section has space allocated in the file, and is not a section
|
|
|
876 * we know. So just copy it.
|
|
|
877 */
|
|
|
878
|
|
|
879 lseek (a_out, sizeof (struct filehdr) + sizeof (struct aouthdr), 0);
|
|
|
880
|
|
|
881 for (scns = f_hdr.f_nscns; scns > 0; scns--)
|
|
|
882 {
|
|
|
883 if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
|
|
|
884 PERROR ("temacs");
|
|
|
885
|
|
|
886 if (!strcmp (scntemp.s_name, ".text"))
|
|
|
887 {
|
|
|
888 lseek (new, (long) text_scnptr, 0);
|
|
|
889 ptr = (char *) f_ohdr.text_start;
|
|
|
890 end = ptr + f_ohdr.tsize;
|
|
|
891 write_segment (new, ptr, end);
|
|
|
892 }
|
|
|
893 else if (!strcmp (scntemp.s_name, ".data"))
|
|
|
894 {
|
|
|
895 lseek (new, (long) data_scnptr, 0);
|
|
|
896 ptr = (char *) f_ohdr.data_start;
|
|
|
897 end = ptr + f_ohdr.dsize;
|
|
|
898 write_segment (new, ptr, end);
|
|
|
899 }
|
|
|
900 else if (!scntemp.s_scnptr)
|
|
|
901 ; /* do nothing - no data for this section */
|
|
|
902 else
|
|
|
903 {
|
|
|
904 char page[BUFSIZ];
|
|
|
905 int size, n;
|
|
|
906 long old_a_out_ptr = lseek (a_out, 0, 1);
|
|
|
907
|
|
|
908 lseek (a_out, scntemp.s_scnptr, 0);
|
|
|
909 for (size = scntemp.s_size; size > 0; size -= sizeof (page))
|
|
|
910 {
|
|
|
911 n = size > sizeof (page) ? sizeof (page) : size;
|
|
|
912 if (read (a_out, page, n) != n || write (new, page, n) != n)
|
|
|
913 PERROR ("emacs");
|
|
|
914 }
|
|
|
915 lseek (a_out, old_a_out_ptr, 0);
|
|
|
916 }
|
|
|
917 }
|
|
|
918
|
|
|
919 #else /* COFF, but not USG_SHARED_LIBRARIES */
|
|
|
920
|
|
|
921 #ifdef MSDOS
|
|
|
922 #if __DJGPP__ >= 2
|
|
|
923 /* Dump the original table of exception handlers, not the one
|
|
|
924 where our exception hooks are registered. */
|
|
|
925 __djgpp_exception_toggle ();
|
|
|
926 #endif
|
|
|
927 #endif
|
|
|
928
|
|
|
929 lseek (new, (long) text_scnptr, 0);
|
|
|
930 ptr = (char *) f_ohdr.text_start;
|
|
|
931 #ifdef HEADER_INCL_IN_TEXT
|
|
|
932 /* For Gould UTX/32, text starts after headers */
|
|
|
933 ptr = (char *) (ptr + text_scnptr);
|
|
|
934 #endif /* HEADER_INCL_IN_TEXT */
|
|
|
935 end = ptr + f_ohdr.tsize;
|
|
|
936 write_segment (new, ptr, end);
|
|
|
937
|
|
|
938 lseek (new, (long) data_scnptr, 0);
|
|
|
939 ptr = (char *) f_ohdr.data_start;
|
|
|
940 end = ptr + f_ohdr.dsize;
|
|
|
941 write_segment (new, ptr, end);
|
|
|
942
|
|
|
943 #ifdef MSDOS
|
|
|
944 #if __DJGPP__ >= 2
|
|
|
945 /* Restore our exception hooks. */
|
|
|
946 __djgpp_exception_toggle ();
|
|
|
947 #endif
|
|
|
948 #endif
|
|
|
949
|
|
|
950 #endif /* USG_SHARED_LIBRARIES */
|
|
|
951
|
|
|
952 #else /* if not COFF */
|
|
|
953
|
|
|
954 /* Some machines count the header as part of the text segment.
|
|
|
955 That is to say, the header appears in core
|
|
|
956 just before the address that start_of_text returns.
|
|
|
957 For them, N_TXTOFF is the place where the header goes.
|
|
|
958 We must adjust the seek to the place after the header.
|
|
|
959 Note that at this point hdr.a_text does *not* count
|
|
|
960 the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
|
|
|
961
|
|
|
962 #ifdef A_TEXT_SEEK
|
|
|
963 lseek (new, (long) A_TEXT_SEEK (hdr), 0);
|
|
|
964 #else
|
|
|
965 lseek (new, (long) N_TXTOFF (hdr), 0);
|
|
|
966 #endif /* no A_TEXT_SEEK */
|
|
|
967
|
|
|
968 #ifdef RISCiX
|
|
|
969
|
|
|
970 /* Acorn's RISC-iX has a wacky way of initialising the position of the heap.
|
|
|
971 * There is a little table in crt0.o that is filled at link time with
|
|
|
972 * the min and current brk positions, among other things. When start
|
|
|
973 * runs, it copies the table to where these parameters live during
|
|
|
974 * execution. This data is in text space, so it cannot be modified here
|
|
|
975 * before saving the executable, so the data is written manually. In
|
|
|
976 * addition, the table does not have a label, and the nearest accessible
|
|
|
977 * label (mcount) is not prefixed with a '_', thus making it inaccessible
|
|
|
978 * from within C programs. To overcome this, emacs's executable is passed
|
|
|
979 * through the command 'nm %s | fgrep mcount' into a pipe, and the
|
|
|
980 * resultant output is then used to find the address of 'mcount'. As far as
|
|
|
981 * is possible to determine, in RISC-iX releases prior to 1.2, the negative
|
|
|
982 * offset of the table from mcount is 0x2c, whereas from 1.2 onwards it is
|
|
|
983 * 0x30. bss_end has been rounded up to page boundary. This solution is
|
|
|
984 * based on suggestions made by Kevin Welton and Steve Hunt of Acorn, and
|
|
|
985 * avoids the need for a custom version of crt0.o for emacs which has its
|
|
|
986 * table in data space.
|
|
|
987 */
|
|
|
988
|
|
|
989 {
|
|
|
990 char command[1024];
|
|
|
991 char errbuf[1024];
|
|
|
992 char address_text[32];
|
|
|
993 int proforma[4];
|
|
|
994 FILE *pfile;
|
|
|
995 char *temp_ptr;
|
|
|
996 char c;
|
|
|
997 int mcount_address, mcount_offset, count;
|
|
|
998 extern char *_execname;
|
|
|
999
|
|
|
1000
|
|
|
1001 /* The use of _execname is incompatible with RISCiX 1.1 */
|
|
|
1002 sprintf (command, "nm %s | fgrep mcount", _execname);
|
|
|
1003
|
|
|
1004 if ( (pfile = popen(command, "r")) == NULL)
|
|
|
1005 {
|
|
|
1006 sprintf (errbuf, "Could not open pipe");
|
|
|
1007 PERROR (errbuf);
|
|
|
1008 }
|
|
|
1009
|
|
|
1010 count=0;
|
|
|
1011 while ( ((c=getc(pfile)) != EOF) && (c != ' ') && (count < 31))
|
|
|
1012 address_text[count++]=c;
|
|
|
1013 address_text[count]=0;
|
|
|
1014
|
|
|
1015 if ((count == 0) || pclose(pfile) != NULL)
|
|
|
1016 {
|
|
|
1017 sprintf (errbuf, "Failed to execute the command '%s'\n", command);
|
|
|
1018 PERROR (errbuf);
|
|
|
1019 }
|
|
|
1020
|
|
|
1021 sscanf(address_text, "%x", &mcount_address);
|
|
|
1022 ptr = (char *) unexec_text_start;
|
|
|
1023 mcount_offset = (char *)mcount_address - ptr;
|
|
|
1024
|
|
|
1025 #ifdef RISCiX_1_1
|
|
|
1026 #define EDATA_OFFSET 0x2c
|
|
|
1027 #else
|
|
|
1028 #define EDATA_OFFSET 0x30
|
|
|
1029 #endif
|
|
|
1030
|
|
|
1031 end = ptr + mcount_offset - EDATA_OFFSET;
|
|
|
1032
|
|
|
1033 write_segment (new, ptr, end);
|
|
|
1034
|
|
|
1035 proforma[0] = bss_end; /* becomes _edata */
|
|
|
1036 proforma[1] = bss_end; /* becomes _end */
|
|
|
1037 proforma[2] = bss_end; /* becomes _minbrk */
|
|
|
1038 proforma[3] = bss_end; /* becomes _curbrk */
|
|
|
1039
|
|
|
1040 write (new, proforma, 16);
|
|
|
1041
|
|
|
1042 temp_ptr = ptr;
|
|
|
1043 ptr = end + 16;
|
|
|
1044 end = temp_ptr + hdr.a_text;
|
|
|
1045
|
|
|
1046 write_segment (new, ptr, end);
|
|
|
1047 }
|
|
|
1048
|
|
|
1049 #else /* !RISCiX */
|
|
|
1050 ptr = (char *) unexec_text_start;
|
|
|
1051 end = ptr + hdr.a_text;
|
|
|
1052 write_segment (new, ptr, end);
|
|
|
1053 #endif /* RISCiX */
|
|
|
1054
|
|
|
1055 ptr = (char *) unexec_data_start;
|
|
|
1056 end = ptr + hdr.a_data;
|
|
|
1057 /* This lseek is certainly incorrect when A_TEXT_OFFSET
|
|
|
1058 and I believe it is a no-op otherwise.
|
|
|
1059 Let's see if its absence ever fails. */
|
|
|
1060 /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
|
|
|
1061 write_segment (new, ptr, end);
|
|
|
1062
|
|
|
1063 #endif /* not COFF */
|
|
|
1064
|
|
|
1065 return 0;
|
|
|
1066 }
|
|
|
1067
|
|
|
1068 static void
|
|
|
1069 write_segment (new, ptr, end)
|
|
|
1070 int new;
|
|
|
1071 char *ptr, *end;
|
|
|
1072 {
|
|
|
1073 int i, nwrite, ret;
|
|
|
1074 #if 0
|
|
|
1075 char buf[80];
|
|
|
1076 #endif
|
|
|
1077 extern int errno;
|
|
|
1078 /* This is the normal amount to write at once.
|
|
|
1079 It is the size of block that NFS uses. */
|
|
|
1080 int writesize = 1 << 13;
|
|
|
1081 int pagesize = getpagesize ();
|
|
|
1082 char zeros[1 << 13];
|
|
|
1083
|
|
|
1084 memset (zeros, 0, sizeof (zeros));
|
|
|
1085
|
|
|
1086 for (i = 0; ptr < end;)
|
|
|
1087 {
|
|
|
1088 /* Distance to next multiple of writesize. */
|
|
|
1089 nwrite = (((int) ptr + writesize) & -writesize) - (int) ptr;
|
|
|
1090 /* But not beyond specified end. */
|
|
|
1091 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
1092 ret = write (new, ptr, nwrite);
|
|
|
1093 /* If write gets a page fault, it means we reached
|
|
|
1094 a gap between the old text segment and the old data segment.
|
|
|
1095 This gap has probably been remapped into part of the text segment.
|
|
|
1096 So write zeros for it. */
|
|
|
1097 if (ret == -1
|
|
|
1098 #ifdef EFAULT
|
|
|
1099 && errno == EFAULT
|
|
|
1100 #endif
|
|
|
1101 )
|
|
|
1102 {
|
|
|
1103 /* Write only a page of zeros at once,
|
|
2
|
1104 so that we don't overshoot the start
|
|
0
|
1105 of the valid memory in the old data segment. */
|
|
|
1106 if (nwrite > pagesize)
|
|
|
1107 nwrite = pagesize;
|
|
|
1108 write (new, zeros, nwrite);
|
|
|
1109 }
|
|
|
1110 #if 0 /* Now that we have can ask `write' to write more than a page,
|
|
|
1111 it is legit for write do less than the whole amount specified. */
|
|
|
1112 else if (nwrite != ret)
|
|
|
1113 {
|
|
|
1114 sprintf (buf,
|
|
|
1115 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
1116 (unsigned long) ptr, new, nwrite, ret, errno);
|
|
|
1117 PERROR (buf);
|
|
|
1118 }
|
|
|
1119 #endif
|
|
|
1120 i += nwrite;
|
|
|
1121 ptr += nwrite;
|
|
|
1122 }
|
|
|
1123 }
|
|
|
1124
|
|
|
1125 /* ****************************************************************
|
|
|
1126 * copy_sym
|
|
|
1127 *
|
|
|
1128 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
1129 */
|
|
|
1130 static int
|
|
|
1131 copy_sym (int new, int a_out, char *a_name, char *new_name)
|
|
|
1132 {
|
|
|
1133 char page[1024];
|
|
|
1134 int n;
|
|
|
1135
|
|
|
1136 if (a_out < 0)
|
|
|
1137 return 0;
|
|
|
1138
|
|
|
1139 #ifdef COFF
|
|
|
1140 if (SYMS_START == 0L)
|
|
|
1141 return 0;
|
|
|
1142 #endif /* COFF */
|
|
|
1143
|
|
|
1144 #ifdef COFF
|
|
|
1145 if (lnnoptr) /* if there is line number info */
|
|
|
1146 lseek (a_out, lnnoptr, 0); /* start copying from there */
|
|
|
1147 else
|
|
|
1148 #endif /* COFF */
|
|
|
1149 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
|
|
1150
|
|
|
1151 while ((n = read (a_out, page, sizeof page)) > 0)
|
|
|
1152 {
|
|
|
1153 if (write (new, page, n) != n)
|
|
|
1154 {
|
|
|
1155 PERROR (new_name);
|
|
|
1156 }
|
|
|
1157 }
|
|
|
1158 if (n < 0)
|
|
|
1159 {
|
|
|
1160 PERROR (a_name);
|
|
|
1161 }
|
|
|
1162 return 0;
|
|
|
1163 }
|
|
|
1164
|
|
|
1165 /* ****************************************************************
|
|
|
1166 * mark_x
|
|
|
1167 *
|
|
|
1168 * After successfully building the new a.out, mark it executable
|
|
|
1169 */
|
|
|
1170 static void
|
|
|
1171 mark_x (char *name)
|
|
|
1172 {
|
|
|
1173 struct stat sbuf;
|
|
|
1174 int um;
|
|
|
1175 int new = 0; /* for PERROR */
|
|
|
1176
|
|
|
1177 um = umask (777);
|
|
|
1178 umask (um);
|
|
|
1179 if (stat (name, &sbuf) == -1)
|
|
|
1180 {
|
|
|
1181 PERROR (name);
|
|
|
1182 }
|
|
|
1183 sbuf.st_mode |= 0111 & ~um;
|
|
|
1184 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
1185 PERROR (name);
|
|
|
1186 }
|
|
|
1187
|
|
|
1188 #ifdef COFF
|
|
|
1189 #ifndef COFF_BSD_SYMBOLS
|
|
|
1190
|
|
|
1191 /*
|
|
|
1192 * If the COFF file contains a symbol table and a line number section,
|
|
|
1193 * then any auxiliary entries that have values for x_lnnoptr must
|
|
|
1194 * be adjusted by the amount that the line number section has moved
|
|
|
1195 * in the file (bias computed in make_hdr). The #@$%&* designers of
|
|
|
1196 * the auxiliary entry structures used the absolute file offsets for
|
|
|
1197 * the line number entry rather than an offset from the start of the
|
|
|
1198 * line number section!
|
|
|
1199 *
|
|
|
1200 * When I figure out how to scan through the symbol table and pick out
|
|
|
1201 * the auxiliary entries that need adjustment, this routine will
|
|
|
1202 * be fixed. As it is now, all such entries are wrong and sdb
|
|
|
1203 * will complain. Fred Fish, UniSoft Systems Inc.
|
|
|
1204 */
|
|
|
1205
|
|
|
1206 /* This function is probably very slow. Instead of reopening the new
|
|
|
1207 file for input and output it should copy from the old to the new
|
|
|
1208 using the two descriptors already open (WRITEDESC and READDESC).
|
|
|
1209 Instead of reading one small structure at a time it should use
|
|
|
1210 a reasonable size buffer. But I don't have time to work on such
|
|
|
1211 things, so I am installing it as submitted to me. -- RMS. */
|
|
|
1212
|
|
|
1213 int
|
|
|
1214 adjust_lnnoptrs (writedesc, readdesc, new_name)
|
|
|
1215 int writedesc;
|
|
|
1216 int readdesc;
|
|
|
1217 char *new_name;
|
|
|
1218 {
|
|
|
1219 int nsyms;
|
|
|
1220 int new;
|
|
|
1221 #if defined (amdahl_uts) || defined (pfa)
|
|
|
1222 SYMENT symentry;
|
|
|
1223 AUXENT auxentry;
|
|
|
1224 #else
|
|
|
1225 struct syment symentry;
|
|
|
1226 union auxent auxentry;
|
|
|
1227 #endif
|
|
|
1228
|
|
|
1229 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
1230 return 0;
|
|
|
1231
|
|
|
1232 #ifdef MSDOS
|
|
|
1233 if ((new = writedesc) < 0)
|
|
|
1234 #else
|
|
|
1235 if ((new = open (new_name, O_RDWR)) < 0)
|
|
|
1236 #endif
|
|
|
1237 {
|
|
|
1238 PERROR (new_name);
|
|
|
1239 return -1;
|
|
|
1240 }
|
|
|
1241
|
|
|
1242 lseek (new, f_hdr.f_symptr, 0);
|
|
|
1243 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
1244 {
|
|
|
1245 read (new, &symentry, SYMESZ);
|
|
|
1246 if (symentry.n_numaux)
|
|
|
1247 {
|
|
|
1248 read (new, &auxentry, AUXESZ);
|
|
|
1249 nsyms++;
|
|
|
1250 if (ISFCN (symentry.n_type) || symentry.n_type == 0x2400)
|
|
|
1251 {
|
|
|
1252 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
|
1253 lseek (new, -AUXESZ, 1);
|
|
|
1254 write (new, &auxentry, AUXESZ);
|
|
|
1255 }
|
|
|
1256 }
|
|
|
1257 }
|
|
|
1258 #ifndef MSDOS
|
|
|
1259 close (new);
|
|
|
1260 #endif
|
|
|
1261 return 0;
|
|
|
1262 }
|
|
|
1263
|
|
|
1264 #endif /* COFF_BSD_SYMBOLS */
|
|
|
1265
|
|
|
1266 #endif /* COFF */
|
|
|
1267
|
|
|
1268 #endif /* not CANNOT_DUMP */
|
