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