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286
|
1 /* Dump an executable image.
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2 Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
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0
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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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286
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21 /* Synched up with: FSF 20.2. */
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0
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22
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286
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23 /* Originally based on the COFF unexec.c by Spencer W. Thomas.
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0
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24 *
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286
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25 * Subsequently hacked on by
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26 * Bill Mann <Bill_Man@praxisint.com>
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27 * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz>
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28 * Mike Sperber <sperber@informatik.uni-tuebingen.de>
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0
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29 *
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30 * Synopsis:
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31 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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32 * char *new_name, *a_name;
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33 * unsigned data_start, bss_start, entry_address;
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34 *
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35 * Takes a snapshot of the program and makes an a.out format file in the
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36 * file named by the string argument new_name.
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37 * If a_name is non-NULL, the symbol table will be taken from the given file.
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38 * On some machines, an existing a_name file is required.
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39 *
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286
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40 * data_start and entry_address are ignored.
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0
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41 *
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286
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42 * bss_start indicates how much of the data segment is to be saved in the
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0
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43 * a.out file and restored when the program is executed. It gives the lowest
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44 * unsaved address, and is rounded up to a page boundary. The default when 0
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45 * is given assumes that the entire data segment is to be stored, including
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46 * the previous data and bss as well as any additional storage allocated with
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286
|
47 * sbrk(2).
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0
|
48 *
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49 */
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50
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51 #ifndef emacs
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52 #define PERROR(arg) perror (arg); return -1
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53 #else
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54 #include <config.h>
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55 #define PERROR(file) report_error (file, new)
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56 #endif
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57
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58 #include <a.out.h>
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59 /* Define getpagesize () if the system does not.
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60 Note that this may depend on symbols defined in a.out.h
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61 */
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62 #include "getpagesize.h"
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63
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|
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64 #include <sys/types.h>
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65 #include <stdio.h>
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66 #include <sys/stat.h>
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67 #include <errno.h>
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286
|
68 #include <unistd.h>
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|
69 #include <fcntl.h>
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0
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70
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219
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71 extern char *start_of_text (void); /* Start of text */
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72 extern char *start_of_data (void); /* Start of initialized data */
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0
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73
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74 extern int _data;
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75 extern int _text;
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286
|
76
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0
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77 #include <filehdr.h>
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78 #include <aouthdr.h>
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79 #include <scnhdr.h>
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80 #include <syms.h>
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286
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81
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0
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82 static struct filehdr f_hdr; /* File header */
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83 static struct aouthdr f_ohdr; /* Optional file header (a.out) */
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286
|
84 static long bias; /* Bias to add for growth */
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|
85 static long lnnoptr; /* Pointer to line-number info within file */
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0
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86
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87 static long text_scnptr;
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|
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88 static long data_scnptr;
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89 #define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
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90 static long load_scnptr;
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91 static long orig_load_scnptr;
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92 static long orig_data_scnptr;
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286
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93 static int unrelocate_symbols (int, int, char *, char *);
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0
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94
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95 #ifndef MAX_SECTIONS
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96 #define MAX_SECTIONS 10
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97 #endif
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98
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286
|
99 static int adjust_lnnoptrs (int, int, char *);
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0
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100
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101 static int pagemask;
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102
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103 /* Correct an int which is the bit pattern of a pointer to a byte
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104 into an int which is the number of a byte.
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105 This is a no-op on ordinary machines, but not on all. */
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106
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107 #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
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|
108 #define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
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|
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109 #endif
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110
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|
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111 #ifdef emacs
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112 #include "lisp.h"
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113
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286
|
114 static void
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219
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115 report_error (char *file, int fd)
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0
|
116 {
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|
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117 if (fd)
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|
118 close (fd);
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119 report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
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120 }
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121 #endif /* emacs */
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122
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|
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123 #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
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124 #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
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|
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125 #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
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126
|
|
286
|
127 static void
|
|
219
|
128 report_error_1 (int fd, char *msg, int a1, int a2)
|
|
0
|
129 {
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|
|
130 close (fd);
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|
131 #ifdef emacs
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132 error (msg, a1, a2);
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133 #else
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134 fprintf (stderr, msg, a1, a2);
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135 fprintf (stderr, "\n");
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|
|
136 #endif
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|
|
137 }
|
|
|
138
|
|
219
|
139 static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *);
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|
|
140 static void mark_x (char *);
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|
|
141 static int copy_text_and_data (int);
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|
|
142 static int copy_sym (int, int, char *, char *);
|
|
286
|
143 static void write_segment (int, char *, char *);
|
|
0
|
144
|
|
|
145 /* ****************************************************************
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|
|
146 * unexec
|
|
|
147 *
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|
|
148 * driving logic.
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|
|
149 */
|
|
219
|
150 int unexec (char *new_name, char *a_name,
|
|
286
|
151 uintptr_t data_start,
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|
|
152 uintptr_t bss_start,
|
|
|
153 uintptr_t entry_address)
|
|
0
|
154 {
|
|
286
|
155 int new = -1, a_out = -1;
|
|
0
|
156
|
|
294
|
157 if (a_name && (a_out = open (a_name, O_RDONLY)) < 0)
|
|
0
|
158 {
|
|
|
159 PERROR (a_name);
|
|
|
160 }
|
|
|
161 if ((new = creat (new_name, 0666)) < 0)
|
|
|
162 {
|
|
|
163 PERROR (new_name);
|
|
|
164 }
|
|
286
|
165 if (make_hdr (new, a_out,
|
|
|
166 data_start, bss_start,
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|
|
167 entry_address,
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|
|
168 a_name, new_name) < 0
|
|
0
|
169 || copy_text_and_data (new) < 0
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|
|
170 || copy_sym (new, a_out, a_name, new_name) < 0
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|
|
171 || adjust_lnnoptrs (new, a_out, new_name) < 0
|
|
286
|
172 || unrelocate_symbols (new, a_out, a_name, new_name) < 0)
|
|
0
|
173 {
|
|
|
174 close (new);
|
|
|
175 return -1;
|
|
|
176 }
|
|
|
177
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|
|
178 close (new);
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|
|
179 if (a_out >= 0)
|
|
|
180 close (a_out);
|
|
|
181 mark_x (new_name);
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|
|
182 return 0;
|
|
|
183 }
|
|
|
184
|
|
|
185 /* ****************************************************************
|
|
|
186 * make_hdr
|
|
|
187 *
|
|
|
188 * Make the header in the new a.out from the header in core.
|
|
|
189 * Modify the text and data sizes.
|
|
|
190 */
|
|
|
191 static int
|
|
286
|
192 make_hdr (int new, int a_out,
|
|
|
193 unsigned data_start, unsigned bss_start,
|
|
|
194 unsigned entry_address,
|
|
|
195 char *a_name, char *new_name)
|
|
0
|
196 {
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|
|
197 int scns;
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|
|
198 unsigned int bss_end;
|
|
|
199
|
|
|
200 struct scnhdr section[MAX_SECTIONS];
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|
|
201 struct scnhdr * f_thdr; /* Text section header */
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|
|
202 struct scnhdr * f_dhdr; /* Data section header */
|
|
|
203 struct scnhdr * f_bhdr; /* Bss section header */
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|
|
204 struct scnhdr * f_lhdr; /* Loader section header */
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|
|
205 struct scnhdr * f_tchdr; /* Typechk section header */
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|
|
206 struct scnhdr * f_dbhdr; /* Debug section header */
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|
|
207 struct scnhdr * f_xhdr; /* Except section header */
|
|
|
208
|
|
|
209 load_scnptr = orig_load_scnptr = lnnoptr = 0;
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|
|
210 pagemask = getpagesize () - 1;
|
|
|
211
|
|
|
212 /* Adjust text/data boundary. */
|
|
|
213 data_start = (long) start_of_data ();
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|
|
214 data_start = ADDR_CORRECT (data_start);
|
|
|
215
|
|
|
216 data_start = data_start & ~pagemask; /* (Down) to page boundary. */
|
|
|
217
|
|
|
218 bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
|
|
|
219 bss_end &= ~ pagemask;
|
|
|
220 /* Adjust data/bss boundary. */
|
|
|
221 if (bss_start != 0)
|
|
|
222 {
|
|
|
223 bss_start = (ADDR_CORRECT (bss_start) + pagemask);
|
|
|
224 /* (Up) to page bdry. */
|
|
|
225 bss_start &= ~ pagemask;
|
|
|
226 if (bss_start > bss_end)
|
|
|
227 {
|
|
|
228 ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
|
|
|
229 bss_start);
|
|
|
230 }
|
|
|
231 }
|
|
|
232 else
|
|
|
233 bss_start = bss_end;
|
|
|
234
|
|
|
235 if (data_start > bss_start) /* Can't have negative data size. */
|
|
|
236 {
|
|
|
237 ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
|
|
|
238 data_start, bss_start);
|
|
|
239 }
|
|
|
240
|
|
|
241 /* Salvage as much info from the existing file as possible */
|
|
|
242 f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL;
|
|
|
243 f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL;
|
|
|
244 if (a_out >= 0)
|
|
|
245 {
|
|
|
246 if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
247 {
|
|
|
248 PERROR (a_name);
|
|
|
249 }
|
|
|
250 if (f_hdr.f_opthdr > 0)
|
|
|
251 {
|
|
|
252 if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
253 {
|
|
|
254 PERROR (a_name);
|
|
|
255 }
|
|
|
256 }
|
|
|
257 if (f_hdr.f_nscns > MAX_SECTIONS)
|
|
|
258 {
|
|
|
259 ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS");
|
|
|
260 }
|
|
|
261 /* Loop through section headers */
|
|
|
262 for (scns = 0; scns < f_hdr.f_nscns; scns++) {
|
|
|
263 struct scnhdr *s = §ion[scns];
|
|
|
264 if (read (a_out, s, sizeof (*s)) != sizeof (*s))
|
|
|
265 {
|
|
|
266 PERROR (a_name);
|
|
|
267 }
|
|
|
268
|
|
|
269 #define CHECK_SCNHDR(ptr, name, flags) \
|
|
|
270 if (strcmp(s->s_name, name) == 0) { \
|
|
|
271 if (s->s_flags != flags) { \
|
|
|
272 fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \
|
|
|
273 (unsigned long)s->s_flags, flags, name); \
|
|
|
274 } \
|
|
|
275 if (ptr) { \
|
|
|
276 fprintf(stderr, "unexec: duplicate section header for section %s.\n", \
|
|
|
277 name); \
|
|
|
278 } \
|
|
|
279 ptr = s; \
|
|
|
280 }
|
|
|
281 CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT);
|
|
|
282 CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA);
|
|
|
283 CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS);
|
|
|
284 CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER);
|
|
|
285 CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG);
|
|
|
286 CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK);
|
|
|
287 CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT);
|
|
|
288 }
|
|
|
289
|
|
|
290 if (f_thdr == 0)
|
|
|
291 {
|
|
219
|
292 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _TEXT);
|
|
0
|
293 }
|
|
|
294 if (f_dhdr == 0)
|
|
|
295 {
|
|
219
|
296 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _DATA);
|
|
0
|
297 }
|
|
|
298 if (f_bhdr == 0)
|
|
|
299 {
|
|
219
|
300 ERROR1 ("unexec: couldn't find \"%s\" section", (int) _BSS);
|
|
0
|
301 }
|
|
|
302 }
|
|
|
303 else
|
|
|
304 {
|
|
|
305 ERROR0 ("can't build a COFF file from scratch yet");
|
|
|
306 }
|
|
|
307 orig_data_scnptr = f_dhdr->s_scnptr;
|
|
|
308 orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
|
|
|
309
|
|
|
310 /* Now we alter the contents of all the f_*hdr variables
|
|
|
311 to correspond to what we want to dump. */
|
|
|
312
|
|
|
313 /* Indicate that the reloc information is no longer valid for ld (bind);
|
|
|
314 we only update it enough to fake out the exec-time loader. */
|
|
|
315 f_hdr.f_flags |= (F_RELFLG | F_EXEC);
|
|
|
316
|
|
286
|
317 f_ohdr.dsize = bss_start - f_ohdr.data_start;
|
|
0
|
318 f_ohdr.bsize = bss_end - bss_start;
|
|
|
319
|
|
|
320 f_dhdr->s_size = f_ohdr.dsize;
|
|
|
321 f_bhdr->s_size = f_ohdr.bsize;
|
|
|
322 f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
323 f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
|
|
|
324
|
|
|
325 /* fix scnptr's */
|
|
|
326 {
|
|
|
327 ulong ptr = section[0].s_scnptr;
|
|
|
328
|
|
294
|
329 bias = -1;
|
|
0
|
330 for (scns = 0; scns < f_hdr.f_nscns; scns++)
|
|
|
331 {
|
|
|
332 struct scnhdr *s = §ion[scns];
|
|
|
333
|
|
|
334 if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */
|
|
|
335 {
|
|
|
336 /*
|
|
|
337 * the text_start should probably be o_algntext but that doesn't
|
|
|
338 * seem to change
|
|
|
339 */
|
|
|
340 if (f_ohdr.text_start != 0) /* && scns != 0 */
|
|
|
341 {
|
|
|
342 s->s_size = 512 - (ptr % 512);
|
|
|
343 if (s->s_size == 512)
|
|
|
344 s->s_size = 0;
|
|
|
345 }
|
|
|
346 s->s_scnptr = ptr;
|
|
|
347 }
|
|
294
|
348 else if (s->s_flags & STYP_DATA)
|
|
|
349 s->s_scnptr = ptr;
|
|
|
350 else if (!(s->s_flags & (STYP_TEXT | STYP_BSS)))
|
|
0
|
351 {
|
|
294
|
352 if (bias == -1) /* if first section after bss */
|
|
0
|
353 bias = ptr - s->s_scnptr;
|
|
294
|
354
|
|
|
355 s->s_scnptr += bias;
|
|
|
356 ptr = s->s_scnptr;
|
|
286
|
357 }
|
|
294
|
358
|
|
0
|
359 ptr = ptr + s->s_size;
|
|
|
360 }
|
|
|
361 }
|
|
|
362
|
|
|
363 /* fix other pointers */
|
|
|
364 for (scns = 0; scns < f_hdr.f_nscns; scns++)
|
|
|
365 {
|
|
|
366 struct scnhdr *s = §ion[scns];
|
|
|
367
|
|
|
368 if (s->s_relptr != 0)
|
|
|
369 {
|
|
|
370 s->s_relptr += bias;
|
|
|
371 }
|
|
|
372 if (s->s_lnnoptr != 0)
|
|
|
373 {
|
|
|
374 if (lnnoptr == 0) lnnoptr = s->s_lnnoptr;
|
|
|
375 s->s_lnnoptr += bias;
|
|
|
376 }
|
|
|
377 }
|
|
|
378
|
|
|
379 if (f_hdr.f_symptr > 0L)
|
|
|
380 {
|
|
|
381 f_hdr.f_symptr += bias;
|
|
|
382 }
|
|
|
383
|
|
|
384 text_scnptr = f_thdr->s_scnptr;
|
|
|
385 data_scnptr = f_dhdr->s_scnptr;
|
|
|
386 load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
|
|
|
387
|
|
|
388 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
389 {
|
|
|
390 PERROR (new_name);
|
|
|
391 }
|
|
|
392
|
|
|
393 if (f_hdr.f_opthdr > 0)
|
|
|
394 {
|
|
|
395 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
396 {
|
|
|
397 PERROR (new_name);
|
|
|
398 }
|
|
|
399 }
|
|
|
400
|
|
|
401 for (scns = 0; scns < f_hdr.f_nscns; scns++) {
|
|
|
402 struct scnhdr *s = §ion[scns];
|
|
|
403 if (write (new, s, sizeof (*s)) != sizeof (*s))
|
|
|
404 {
|
|
|
405 PERROR (new_name);
|
|
|
406 }
|
|
|
407 }
|
|
|
408
|
|
|
409 return (0);
|
|
|
410 }
|
|
|
411
|
|
|
412 /* ****************************************************************
|
|
|
413
|
|
|
414 *
|
|
|
415 * Copy the text and data segments from memory to the new a.out
|
|
|
416 */
|
|
|
417 static int
|
|
219
|
418 copy_text_and_data (int new)
|
|
0
|
419 {
|
|
|
420 char *end;
|
|
|
421 char *ptr;
|
|
|
422
|
|
286
|
423 lseek (new, (long) text_scnptr, SEEK_SET);
|
|
0
|
424 ptr = start_of_text () + text_scnptr;
|
|
|
425 end = ptr + f_ohdr.tsize;
|
|
|
426 write_segment (new, ptr, end);
|
|
|
427
|
|
286
|
428 lseek (new, (long) data_scnptr, SEEK_SET);
|
|
|
429 ptr = (char *) f_ohdr.data_start;
|
|
0
|
430 end = ptr + f_ohdr.dsize;
|
|
|
431 write_segment (new, ptr, end);
|
|
|
432
|
|
|
433 return 0;
|
|
|
434 }
|
|
|
435
|
|
|
436 #define UnexBlockSz (1<<12) /* read/write block size */
|
|
286
|
437 static void
|
|
219
|
438 write_segment (int new, char *ptr, char *end)
|
|
0
|
439 {
|
|
|
440 int i, nwrite, ret;
|
|
|
441 char buf[80];
|
|
|
442 extern int errno;
|
|
|
443 char zeros[UnexBlockSz];
|
|
|
444
|
|
|
445 for (i = 0; ptr < end;)
|
|
|
446 {
|
|
|
447 /* distance to next block. */
|
|
|
448 nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr;
|
|
|
449 /* But not beyond specified end. */
|
|
|
450 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
451 ret = write (new, ptr, nwrite);
|
|
|
452 /* If write gets a page fault, it means we reached
|
|
|
453 a gap between the old text segment and the old data segment.
|
|
|
454 This gap has probably been remapped into part of the text segment.
|
|
|
455 So write zeros for it. */
|
|
|
456 if (ret == -1 && errno == EFAULT)
|
|
|
457 {
|
|
282
|
458 memset (zeros, 0, nwrite);
|
|
0
|
459 write (new, zeros, nwrite);
|
|
|
460 }
|
|
|
461 else if (nwrite != ret)
|
|
|
462 {
|
|
|
463 sprintf (buf,
|
|
|
464 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
465 (unsigned long)ptr, new, nwrite, ret, errno);
|
|
|
466 PERROR (buf);
|
|
|
467 }
|
|
|
468 i += nwrite;
|
|
|
469 ptr += nwrite;
|
|
|
470 }
|
|
|
471 }
|
|
|
472
|
|
|
473 /* ****************************************************************
|
|
|
474 * copy_sym
|
|
|
475 *
|
|
|
476 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
477 */
|
|
|
478 static int
|
|
219
|
479 copy_sym (int new, int a_out, char *a_name, char *new_name)
|
|
0
|
480 {
|
|
|
481 char page[UnexBlockSz];
|
|
|
482 int n;
|
|
|
483
|
|
|
484 if (a_out < 0)
|
|
|
485 return 0;
|
|
|
486
|
|
|
487 if (orig_load_scnptr == 0L)
|
|
|
488 return 0;
|
|
|
489
|
|
|
490 if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */
|
|
286
|
491 lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */
|
|
0
|
492 else
|
|
286
|
493 lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */
|
|
0
|
494
|
|
|
495 while ((n = read (a_out, page, sizeof page)) > 0)
|
|
|
496 {
|
|
|
497 if (write (new, page, n) != n)
|
|
|
498 {
|
|
|
499 PERROR (new_name);
|
|
|
500 }
|
|
|
501 }
|
|
|
502 if (n < 0)
|
|
|
503 {
|
|
|
504 PERROR (a_name);
|
|
|
505 }
|
|
|
506 return 0;
|
|
|
507 }
|
|
|
508
|
|
|
509 /* ****************************************************************
|
|
|
510 * mark_x
|
|
|
511 *
|
|
|
512 * After successfully building the new a.out, mark it executable
|
|
|
513 */
|
|
|
514 static void
|
|
219
|
515 mark_x (char *name)
|
|
0
|
516 {
|
|
|
517 struct stat sbuf;
|
|
|
518 int um;
|
|
|
519 int new = 0; /* for PERROR */
|
|
|
520
|
|
|
521 um = umask (777);
|
|
|
522 umask (um);
|
|
|
523 if (stat (name, &sbuf) == -1)
|
|
|
524 {
|
|
|
525 PERROR (name);
|
|
|
526 }
|
|
|
527 sbuf.st_mode |= 0111 & ~um;
|
|
|
528 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
529 PERROR (name);
|
|
|
530 }
|
|
|
531
|
|
286
|
532 static int
|
|
219
|
533 adjust_lnnoptrs (int writedesc, int readdesc, char *new_name)
|
|
0
|
534 {
|
|
|
535 int nsyms;
|
|
|
536 int naux;
|
|
|
537 int new;
|
|
|
538 struct syment symentry;
|
|
|
539 union auxent auxentry;
|
|
|
540
|
|
|
541 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
542 return 0;
|
|
|
543
|
|
294
|
544 if ((new = open (new_name, O_RDWR)) < 0)
|
|
0
|
545 {
|
|
|
546 PERROR (new_name);
|
|
|
547 return -1;
|
|
|
548 }
|
|
|
549
|
|
286
|
550 lseek (new, f_hdr.f_symptr, SEEK_SET);
|
|
0
|
551 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
552 {
|
|
|
553 read (new, &symentry, SYMESZ);
|
|
|
554 if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL)
|
|
|
555 {
|
|
|
556 symentry.n_value += bias;
|
|
286
|
557 lseek (new, -SYMESZ, SEEK_CUR);
|
|
0
|
558 write (new, &symentry, SYMESZ);
|
|
|
559 }
|
|
|
560
|
|
298
|
561 for (naux = symentry.n_numaux; naux-- != 0; )
|
|
0
|
562 {
|
|
|
563 read (new, &auxentry, AUXESZ);
|
|
|
564 nsyms++;
|
|
|
565 if (naux != 0 /* skip csect auxentry (last entry) */
|
|
|
566 && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT))
|
|
|
567 {
|
|
|
568 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
286
|
569 lseek (new, -AUXESZ, SEEK_CUR);
|
|
0
|
570 write (new, &auxentry, AUXESZ);
|
|
|
571 }
|
|
|
572 }
|
|
|
573 }
|
|
|
574 close (new);
|
|
286
|
575
|
|
|
576 return 0;
|
|
0
|
577 }
|
|
|
578
|
|
286
|
579 static int
|
|
219
|
580 unrelocate_symbols (int new, int a_out, char *a_name, char *new_name)
|
|
0
|
581 {
|
|
|
582 int i;
|
|
|
583 LDHDR ldhdr;
|
|
286
|
584 LDREL ldrel;
|
|
0
|
585 ulong t_reloc = (ulong) &_text - f_ohdr.text_start;
|
|
286
|
586 #ifndef ALIGN_DATA_RELOC
|
|
|
587 ulong d_reloc = (ulong) &_data - f_ohdr.data_start;
|
|
|
588 #else
|
|
|
589 /* This worked (and was needed) before AIX 4.2.
|
|
|
590 I have no idea why. -- Mike */
|
|
0
|
591 ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2);
|
|
286
|
592 #endif
|
|
0
|
593 int * p;
|
|
|
594
|
|
|
595 if (load_scnptr == 0)
|
|
|
596 return 0;
|
|
|
597
|
|
286
|
598 lseek (a_out, orig_load_scnptr, SEEK_SET);
|
|
0
|
599 if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
|
|
|
600 {
|
|
|
601 PERROR (new_name);
|
|
|
602 }
|
|
|
603
|
|
|
604 #define SYMNDX_TEXT 0
|
|
|
605 #define SYMNDX_DATA 1
|
|
|
606 #define SYMNDX_BSS 2
|
|
|
607
|
|
286
|
608 for (i = 0; i < ldhdr.l_nreloc; i++)
|
|
|
609 {
|
|
|
610 lseek (a_out,
|
|
|
611 orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
|
|
612 SEEK_SET);
|
|
0
|
613
|
|
286
|
614 if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ)
|
|
|
615 {
|
|
|
616 PERROR (a_name);
|
|
|
617 }
|
|
0
|
618
|
|
|
619 /* move the BSS loader symbols to the DATA segment */
|
|
286
|
620 if (ldrel.l_symndx == SYMNDX_BSS)
|
|
0
|
621 {
|
|
286
|
622 ldrel.l_symndx = SYMNDX_DATA;
|
|
0
|
623
|
|
|
624 lseek (new,
|
|
|
625 load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
|
286
|
626 SEEK_SET);
|
|
0
|
627
|
|
286
|
628 if (write (new, &ldrel, LDRELSZ) != LDRELSZ)
|
|
0
|
629 {
|
|
|
630 PERROR (new_name);
|
|
|
631 }
|
|
|
632 }
|
|
|
633
|
|
286
|
634 if (ldrel.l_rsecnm == f_ohdr.o_sndata)
|
|
0
|
635 {
|
|
|
636 int orig_int;
|
|
|
637
|
|
|
638 lseek (a_out,
|
|
286
|
639 orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
|
|
|
640 SEEK_SET);
|
|
0
|
641
|
|
|
642 if (read (a_out, (void *) &orig_int, sizeof (orig_int))
|
|
|
643 != sizeof (orig_int))
|
|
|
644 {
|
|
|
645 PERROR (a_name);
|
|
|
646 }
|
|
|
647
|
|
286
|
648 p = (int *) (ldrel.l_vaddr + d_reloc);
|
|
0
|
649
|
|
286
|
650 switch (ldrel.l_symndx) {
|
|
0
|
651 case SYMNDX_TEXT:
|
|
|
652 orig_int = * p - t_reloc;
|
|
|
653 break;
|
|
|
654
|
|
|
655 case SYMNDX_DATA:
|
|
|
656 case SYMNDX_BSS:
|
|
|
657 orig_int = * p - d_reloc;
|
|
|
658 break;
|
|
|
659 }
|
|
|
660
|
|
|
661 if (orig_int != * p)
|
|
|
662 {
|
|
|
663 lseek (new,
|
|
286
|
664 data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
|
|
|
665 SEEK_SET);
|
|
0
|
666 if (write (new, (void *) &orig_int, sizeof (orig_int))
|
|
|
667 != sizeof (orig_int))
|
|
|
668 {
|
|
|
669 PERROR (new_name);
|
|
|
670 }
|
|
|
671 }
|
|
|
672 }
|
|
|
673 }
|
|
286
|
674 return 0;
|
|
0
|
675 }
|
