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1 /* Modified version of unexec for convex machines.
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2 Copyright (C) 1985, 1986, 1988 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 /* modified for C-1 arch by jthomp@convex 871103 */
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25 /* Corrected to support convex SOFF object file formats and thread specific
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26 * regions. streepy@convex 890302
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27 */
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28
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29 /*
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30 * unexec.c - Convert a running program into an a.out file.
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31 *
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32 * Author: Spencer W. Thomas
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33 * Computer Science Dept.
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34 * University of Utah
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35 * Date: Tue Mar 2 1982
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36 * Modified heavily since then.
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37 *
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38 * Synopsis:
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39 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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40 * char *new_name, *a_name;
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41 * unsigned data_start, bss_start, entry_address;
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42 *
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43 * Takes a snapshot of the program and makes an a.out format file in the
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44 * file named by the string argument new_name.
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45 * If a_name is non-NULL, the symbol table will be taken from the given file.
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46 * On some machines, an existing a_name file is required.
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47 *
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48 * The boundaries within the a.out file may be adjusted with the data_start
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49 * and bss_start arguments. Either or both may be given as 0 for defaults.
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50 *
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51 * Data_start gives the boundary between the text segment and the data
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52 * segment of the program. The text segment can contain shared, read-only
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53 * program code and literal data, while the data segment is always unshared
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54 * and unprotected. Data_start gives the lowest unprotected address.
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55 * The value you specify may be rounded down to a suitable boundary
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56 * as required by the machine you are using.
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57 *
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58 * Specifying zero for data_start means the boundary between text and data
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59 * should not be the same as when the program was loaded.
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60 * If NO_REMAP is defined, the argument data_start is ignored and the
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61 * segment boundaries are never changed.
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62 *
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63 * Bss_start indicates how much of the data segment is to be saved in the
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64 * a.out file and restored when the program is executed. It gives the lowest
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65 * unsaved address, and is rounded up to a page boundary. The default when 0
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66 * is given assumes that the entire data segment is to be stored, including
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67 * the previous data and bss as well as any additional storage allocated with
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68 * break (2).
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69 *
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70 * The new file is set up to start at entry_address.
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71 *
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72 * If you make improvements I'd like to get them too.
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73 * harpo!utah-cs!thomas, thomas@Utah-20
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74 *
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75 */
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76
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77 /* There are several compilation parameters affecting unexec:
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78
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79 * COFF
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80
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81 Define this if your system uses COFF for executables.
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82 Otherwise we assume you use Berkeley format.
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83
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84 * NO_REMAP
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85
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86 Define this if you do not want to try to save Emacs's pure data areas
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87 as part of the text segment.
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88
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89 Saving them as text is good because it allows users to share more.
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90
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91 However, on machines that locate the text area far from the data area,
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92 the boundary cannot feasibly be moved. Such machines require
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93 NO_REMAP.
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94
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95 Also, remapping can cause trouble with the built-in startup routine
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96 /lib/crt0.o, which defines `environ' as an initialized variable.
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97 Dumping `environ' as pure does not work! So, to use remapping,
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98 you must write a startup routine for your machine in Emacs's crt0.c.
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99 If NO_REMAP is defined, Emacs uses the system's crt0.o.
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100
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101 * SECTION_ALIGNMENT
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102
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103 Some machines that use COFF executables require that each section
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104 start on a certain boundary *in the COFF file*. Such machines should
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105 define SECTION_ALIGNMENT to a mask of the low-order bits that must be
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106 zero on such a boundary. This mask is used to control padding between
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107 segments in the COFF file.
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108
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109 If SECTION_ALIGNMENT is not defined, the segments are written
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110 consecutively with no attempt at alignment. This is right for
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111 unmodified system V.
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112
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113 * SEGMENT_MASK
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114
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115 Some machines require that the beginnings and ends of segments
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116 *in core* be on certain boundaries. For most machines, a page
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117 boundary is sufficient. That is the default. When a larger
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118 boundary is needed, define SEGMENT_MASK to a mask of
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119 the bits that must be zero on such a boundary.
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120
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121 * A_TEXT_OFFSET(HDR)
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122
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123 Some machines count the a.out header as part of the size of the text
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124 segment (a_text); they may actually load the header into core as the
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125 first data in the text segment. Some have additional padding between
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126 the header and the real text of the program that is counted in a_text.
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127
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128 For these machines, define A_TEXT_OFFSET(HDR) to examine the header
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129 structure HDR and return the number of bytes to add to `a_text'
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130 before writing it (above and beyond the number of bytes of actual
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131 program text). HDR's standard fields are already correct, except that
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132 this adjustment to the `a_text' field has not yet been made;
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133 thus, the amount of offset can depend on the data in the file.
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134
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135 * A_TEXT_SEEK(HDR)
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136
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137 If defined, this macro specifies the number of bytes to seek into the
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138 a.out file before starting to write the text segment.a
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139
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140 * EXEC_MAGIC
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141
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142 For machines using COFF, this macro, if defined, is a value stored
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143 into the magic number field of the output file.
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144
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145 * ADJUST_EXEC_HEADER
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146
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147 This macro can be used to generate statements to adjust or
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148 initialize nonstandard fields in the file header
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149
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150 * ADDR_CORRECT(ADDR)
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151
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152 Macro to correct an int which is the bit pattern of a pointer to a byte
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153 into an int which is the number of a byte.
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154
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155 This macro has a default definition which is usually right.
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156 This default definition is a no-op on most machines (where a
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157 pointer looks like an int) but not on all machines.
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158
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159 */
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160
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161 #include <config.h>
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162 #define PERROR(file) report_error (file, new)
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163
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164 #include <a.out.h>
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165 /* Define getpagesize () if the system does not.
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166 Note that this may depend on symbols defined in a.out.h
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167 */
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168 #include "getpagesize.h"
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169
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170 #include <sys/types.h>
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171 #include <stdio.h>
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172 #include <sys/stat.h>
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173 #include <errno.h>
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174
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175 extern char *start_of_text (); /* Start of text */
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176 extern char *start_of_data (); /* Start of initialized data */
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177
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178 #include <machine/filehdr.h>
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179 #include <machine/opthdr.h>
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180 #include <machine/scnhdr.h>
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181 #include <machine/pte.h>
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182
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183 static long block_copy_start; /* Old executable start point */
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184 static struct filehdr f_hdr; /* File header */
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185 static struct opthdr f_ohdr; /* Optional file header (a.out) */
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186 long bias; /* Bias to add for growth */
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187 #define SYMS_START block_copy_start
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188
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189 static long text_scnptr;
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190 static long data_scnptr;
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191
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192 static int pagemask;
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193 static int pagesz;
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194
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195 static
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196 report_error (file, fd)
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197 char *file;
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198 int fd;
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199 {
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200 if (fd)
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201 close (fd);
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202 error ("Failure operating on %s", file);
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203 }
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204
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205 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
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206 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
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207 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
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208
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209 static
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210 report_error_1 (fd, msg, a1, a2)
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211 int fd;
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212 char *msg;
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213 int a1, a2;
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214 {
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215 close (fd);
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216 error (msg, a1, a2);
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217 }
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218
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219 /* ****************************************************************
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220 * unexec
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221 *
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222 * driving logic.
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223 */
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224 unexec (new_name, a_name, data_start, bss_start, entry_address)
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225 char *new_name, *a_name;
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226 unsigned data_start, bss_start, entry_address;
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227 {
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228 int new, a_out = -1;
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229
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230 if (a_name && (a_out = open (a_name, 0)) < 0) {
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231 PERROR (a_name);
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232 }
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233 if ((new = creat (new_name, 0666)) < 0) {
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234 PERROR (new_name);
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235 }
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236
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237 if (make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) < 0
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238 || copy_text_and_data (new) < 0
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239 || copy_sym (new, a_out, a_name, new_name) < 0 ) {
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240 close (new);
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241 return -1;
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242 }
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243
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244 close (new);
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245 if (a_out >= 0)
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246 close (a_out);
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247 mark_x (new_name);
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248 return 0;
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249 }
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250
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251 /* ****************************************************************
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252 * make_hdr
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253 *
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254 * Make the header in the new a.out from the header in core.
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255 * Modify the text and data sizes.
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256 */
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257
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258 struct scnhdr *stbl; /* Table of all scnhdr's */
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259 struct scnhdr *f_thdr; /* Text section header */
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260 struct scnhdr *f_dhdr; /* Data section header */
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261 struct scnhdr *f_tdhdr; /* Thread Data section header */
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262 struct scnhdr *f_bhdr; /* Bss section header */
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263 struct scnhdr *f_tbhdr; /* Thread Bss section header */
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264
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265 static int
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266 make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name)
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267 int new, a_out;
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268 unsigned data_start, bss_start, entry_address;
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269 char *a_name;
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270 char *new_name;
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271 {
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272 int scns;
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273 unsigned int bss_end;
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274 unsigned int eo_data; /* End of initialized data in new exec file */
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275 int scntype; /* Section type */
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276 int i; /* Var for sorting by vaddr */
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277 struct scnhdr scntemp; /* For swapping entries in sort */
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278 extern char *start_of_data();
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279
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280 pagemask = (pagesz = getpagesize()) - 1;
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281
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282 /* Adjust text/data boundary. */
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283 if (!data_start)
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284 data_start = (unsigned) start_of_data ();
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285
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286 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
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287
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288 bss_end = (sbrk(0) + pagemask) & ~pagemask;
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289
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290 /* Adjust data/bss boundary. */
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291 if (bss_start != 0) {
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292 bss_start = (bss_start + pagemask) & ~pagemask;/* (Up) to page bdry. */
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293 if (bss_start > bss_end) {
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294 ERROR1 ("unexec: Specified bss_start (%x) is past end of program",
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295 bss_start);
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296 }
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297 } else
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298 bss_start = bss_end;
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299
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300 if (data_start > bss_start) { /* Can't have negative data size. */
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301 ERROR2 ("unexec: data_start (%x) can't be greater than bss_start (%x)",
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302 data_start, bss_start);
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303 }
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304
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305 /* Salvage as much info from the existing file as possible */
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306 if (a_out < 0) {
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307 ERROR0 ("can't build a COFF file from scratch yet");
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308 /*NOTREACHED*/
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309 }
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310
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311 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) {
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312 PERROR (a_name);
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313 }
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314 block_copy_start += sizeof (f_hdr);
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315 if (f_hdr.h_opthdr > 0) {
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316 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) {
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317 PERROR (a_name);
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318 }
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319 block_copy_start += sizeof (f_ohdr);
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320 }
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321
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322 /* Allocate room for scn headers */
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323 stbl = (struct scnhdr *)malloc( sizeof(struct scnhdr) * f_hdr.h_nscns );
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324 if( stbl == NULL ) {
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325 ERROR0( "unexec: malloc of stbl failed" );
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326 }
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327
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328 f_tdhdr = f_tbhdr = NULL;
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329
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330 /* Loop through section headers, copying them in */
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331 for (scns = 0; scns < f_hdr.h_nscns; scns++) {
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332
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333 if( read( a_out, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) {
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334 PERROR (a_name);
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335 }
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336
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337 scntype = stbl[scns].s_flags & S_TYPMASK; /* What type of section */
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338
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339 if( stbl[scns].s_scnptr > 0L) {
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340 if( block_copy_start < stbl[scns].s_scnptr + stbl[scns].s_size )
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341 block_copy_start = stbl[scns].s_scnptr + stbl[scns].s_size;
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342 }
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343
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344 if( scntype == S_TEXT) {
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345 f_thdr = &stbl[scns];
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346 } else if( scntype == S_DATA) {
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347 f_dhdr = &stbl[scns];
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348 #ifdef S_TDATA
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349 } else if( scntype == S_TDATA ) {
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350 f_tdhdr = &stbl[scns];
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351 } else if( scntype == S_TBSS ) {
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352 f_tbhdr = &stbl[scns];
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353 #endif /* S_TDATA (thread stuff) */
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354
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355 } else if( scntype == S_BSS) {
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356 f_bhdr = &stbl[scns];
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357 }
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358
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359 }
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360
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361 /* We will now convert TEXT and DATA into TEXT, BSS into DATA, and leave
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362 * all thread stuff alone.
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363 */
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364
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365 /* Now we alter the contents of all the f_*hdr variables
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366 to correspond to what we want to dump. */
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367
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368 f_thdr->s_vaddr = (long) start_of_text ();
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369 f_thdr->s_size = data_start - f_thdr->s_vaddr;
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370 f_thdr->s_scnptr = pagesz;
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371 f_thdr->s_relptr = 0;
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372 f_thdr->s_nrel = 0;
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373
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374 eo_data = f_thdr->s_scnptr + f_thdr->s_size;
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375
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376 if( f_tdhdr ) { /* Process thread data */
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377
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378 f_tdhdr->s_vaddr = data_start;
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379 f_tdhdr->s_size += f_dhdr->s_size - (data_start - f_dhdr->s_vaddr);
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380 f_tdhdr->s_scnptr = eo_data;
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381 f_tdhdr->s_relptr = 0;
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382 f_tdhdr->s_nrel = 0;
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383
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384 eo_data += f_tdhdr->s_size;
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385
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386 /* And now for DATA */
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387
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388 f_dhdr->s_vaddr = f_bhdr->s_vaddr; /* Take BSS start address */
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389 f_dhdr->s_size = bss_end - f_bhdr->s_vaddr;
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390 f_dhdr->s_scnptr = eo_data;
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391 f_dhdr->s_relptr = 0;
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392 f_dhdr->s_nrel = 0;
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393
|
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394 eo_data += f_dhdr->s_size;
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395
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396 } else {
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397
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398 f_dhdr->s_vaddr = data_start;
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399 f_dhdr->s_size = bss_start - data_start;
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400 f_dhdr->s_scnptr = eo_data;
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401 f_dhdr->s_relptr = 0;
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402 f_dhdr->s_nrel = 0;
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403
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404 eo_data += f_dhdr->s_size;
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405
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406 }
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407
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|
|
408 f_bhdr->s_vaddr = bss_start;
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|
409 f_bhdr->s_size = bss_end - bss_start + pagesz /* fudge */;
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410 f_bhdr->s_scnptr = 0;
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411 f_bhdr->s_relptr = 0;
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412 f_bhdr->s_nrel = 0;
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413
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414 text_scnptr = f_thdr->s_scnptr;
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415 data_scnptr = f_dhdr->s_scnptr;
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416 bias = eo_data - block_copy_start;
|
|
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417
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|
|
418 if (f_ohdr.o_symptr > 0L) {
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|
419 f_ohdr.o_symptr += bias;
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|
|
420 }
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|
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421
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|
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422 if (f_hdr.h_strptr > 0) {
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423 f_hdr.h_strptr += bias;
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424 }
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425
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|
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426 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) {
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427 PERROR (new_name);
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|
|
428 }
|
|
|
429
|
|
|
430 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) {
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|
|
431 PERROR (new_name);
|
|
|
432 }
|
|
|
433
|
|
|
434 for( scns = 0; scns < f_hdr.h_nscns; scns++ ) {
|
|
|
435
|
|
|
436 /* This is a cheesy little loop to write out the section headers
|
|
|
437 * in order of increasing virtual address. Dull but effective.
|
|
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438 */
|
|
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439
|
|
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440 for( i = scns+1; i < f_hdr.h_nscns; i++ ) {
|
|
|
441 if( stbl[i].s_vaddr < stbl[scns].s_vaddr ) { /* Swap */
|
|
|
442 scntemp = stbl[i];
|
|
|
443 stbl[i] = stbl[scns];
|
|
|
444 stbl[scns] = scntemp;
|
|
|
445 }
|
|
|
446 }
|
|
|
447
|
|
|
448 }
|
|
|
449
|
|
|
450 for( scns = 0; scns < f_hdr.h_nscns; scns++ ) {
|
|
|
451
|
|
|
452 if( write( new, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) {
|
|
|
453 PERROR (new_name);
|
|
|
454 }
|
|
|
455
|
|
|
456 }
|
|
|
457
|
|
|
458 return (0);
|
|
|
459
|
|
|
460 }
|
|
|
461
|
|
|
462 /* ****************************************************************
|
|
|
463 * copy_text_and_data
|
|
|
464 *
|
|
|
465 * Copy the text and data segments from memory to the new a.out
|
|
|
466 */
|
|
|
467 static int
|
|
|
468 copy_text_and_data (new)
|
|
|
469 int new;
|
|
|
470 {
|
|
|
471 int scns;
|
|
|
472
|
|
|
473 for( scns = 0; scns < f_hdr.h_nscns; scns++ )
|
|
|
474 write_segment( new, &stbl[scns] );
|
|
|
475
|
|
|
476 return 0;
|
|
|
477 }
|
|
|
478
|
|
|
479 write_segment( new, sptr )
|
|
|
480 int new;
|
|
|
481 struct scnhdr *sptr;
|
|
|
482 {
|
|
|
483 char *ptr, *end;
|
|
|
484 int nwrite, ret;
|
|
|
485 char buf[80];
|
|
|
486 extern int errno;
|
|
|
487 char zeros[128];
|
|
|
488
|
|
|
489 if( sptr->s_scnptr == 0 )
|
|
|
490 return; /* Nothing to do */
|
|
|
491
|
|
|
492 if( lseek( new, (long) sptr->s_scnptr, 0 ) == -1 )
|
|
|
493 PERROR( "unexecing" );
|
|
|
494
|
|
282
|
495 memset (zeros, 0, sizeof zeros);
|
|
0
|
496
|
|
|
497 ptr = (char *) sptr->s_vaddr;
|
|
|
498 end = ptr + sptr->s_size;
|
|
|
499
|
|
|
500 while( ptr < end ) {
|
|
|
501
|
|
|
502 /* distance to next multiple of 128. */
|
|
|
503 nwrite = (((int) ptr + 128) & -128) - (int) ptr;
|
|
|
504 /* But not beyond specified end. */
|
|
|
505 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
506 ret = write (new, ptr, nwrite);
|
|
|
507 /* If write gets a page fault, it means we reached
|
|
|
508 a gap between the old text segment and the old data segment.
|
|
|
509 This gap has probably been remapped into part of the text segment.
|
|
|
510 So write zeros for it. */
|
|
|
511 if (ret == -1 && errno == EFAULT)
|
|
|
512 write (new, zeros, nwrite);
|
|
|
513 else if (nwrite != ret) {
|
|
|
514 sprintf (buf,
|
|
|
515 "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
516 ptr, new, nwrite, ret, errno);
|
|
|
517 PERROR (buf);
|
|
|
518 }
|
|
|
519 ptr += nwrite;
|
|
|
520 }
|
|
|
521 }
|
|
|
522
|
|
|
523 /* ****************************************************************
|
|
|
524 * copy_sym
|
|
|
525 *
|
|
|
526 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
527 */
|
|
|
528 static int
|
|
|
529 copy_sym (new, a_out, a_name, new_name)
|
|
|
530 int new, a_out;
|
|
|
531 char *a_name, *new_name;
|
|
|
532 {
|
|
|
533 char page[1024];
|
|
|
534 int n;
|
|
|
535
|
|
|
536 if (a_out < 0)
|
|
|
537 return 0;
|
|
|
538
|
|
|
539 if (SYMS_START == 0L)
|
|
|
540 return 0;
|
|
|
541
|
|
|
542 lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
|
|
543 lseek( new, (long)f_ohdr.o_symptr, 0 );
|
|
|
544
|
|
|
545 while ((n = read (a_out, page, sizeof page)) > 0) {
|
|
|
546 if (write (new, page, n) != n) {
|
|
|
547 PERROR (new_name);
|
|
|
548 }
|
|
|
549 }
|
|
|
550 if (n < 0) {
|
|
|
551 PERROR (a_name);
|
|
|
552 }
|
|
|
553 return 0;
|
|
|
554 }
|
|
|
555
|
|
|
556 /* ****************************************************************
|
|
|
557 * mark_x
|
|
|
558 *
|
|
|
559 * After successfully building the new a.out, mark it executable
|
|
|
560 */
|
|
|
561 static
|
|
|
562 mark_x (name)
|
|
|
563 char *name;
|
|
|
564 {
|
|
|
565 struct stat sbuf;
|
|
|
566 int um;
|
|
|
567 int new = 0; /* for PERROR */
|
|
|
568
|
|
|
569 um = umask (777);
|
|
|
570 umask (um);
|
|
|
571 if (stat (name, &sbuf) == -1) {
|
|
|
572 PERROR (name);
|
|
|
573 }
|
|
|
574 sbuf.st_mode |= 0111 & ~um;
|
|
|
575 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
576 PERROR (name);
|
|
|
577 }
|
|
|
578
|
|
|
579 /* Find the first pty letter. This is usually 'p', as in ptyp0, but
|
|
|
580 is sometimes configured down to 'm', 'n', or 'o' for some reason. */
|
|
|
581
|
|
|
582 first_pty_letter ()
|
|
|
583 {
|
|
|
584 struct stat buf;
|
|
|
585 char pty_name[16];
|
|
|
586 char c;
|
|
|
587
|
|
|
588 for (c = 'o'; c >= 'a'; c--)
|
|
|
589 {
|
|
|
590 sprintf (pty_name, "/dev/pty%c0", c);
|
|
|
591 if (stat (pty_name, &buf) < 0)
|
|
|
592 return c + 1;
|
|
|
593 }
|
|
|
594 return 'a';
|
|
|
595 }
|
|
|
596
|
