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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
|
40 * data_start and entry_address are ignored.
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0
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41 *
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286
|
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).
|
|
0
|
48 *
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|
49 */
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50
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|
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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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|
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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
|
70
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|
219
|
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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|
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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
|
81
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|
0
|
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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|
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87 static long text_scnptr;
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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
|
93 static int unrelocate_symbols (int, int, char *, char *);
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0
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94
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|
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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 *);
|
|
0
|
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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|
|
109 #endif
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|
|
110
|
|
|
111 #ifdef emacs
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|
|
112 #include "lisp.h"
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|
|
113
|
|
286
|
114 static void
|
|
219
|
115 report_error (char *file, int fd)
|
|
0
|
116 {
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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));
|
|
|
120 }
|
|
|
121 #endif /* emacs */
|
|
|
122
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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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|
|
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 {
|
|
|
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");
|
|
|
136 #endif
|
|
|
137 }
|
|
|
138
|
|
219
|
139 static int make_hdr (int, int, unsigned, unsigned, unsigned, char *, char *);
|
|
|
140 static void mark_x (char *);
|
|
|
141 static int copy_text_and_data (int);
|
|
|
142 static int copy_sym (int, int, char *, char *);
|
|
286
|
143 static void write_segment (int, char *, char *);
|
|
0
|
144
|
|
|
145 /* ****************************************************************
|
|
|
146 * unexec
|
|
|
147 *
|
|
|
148 * driving logic.
|
|
|
149 */
|
|
219
|
150 int unexec (char *new_name, char *a_name,
|
|
286
|
151 uintptr_t data_start,
|
|
|
152 uintptr_t bss_start,
|
|
|
153 uintptr_t entry_address)
|
|
0
|
154 {
|
|
286
|
155 int new = -1, a_out = -1;
|
|
0
|
156
|
|
|
157 if (a_name && (a_out = open (a_name, 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,
|
|
|
167 entry_address,
|
|
|
168 a_name, new_name) < 0
|
|
0
|
169 || copy_text_and_data (new) < 0
|
|
|
170 || copy_sym (new, a_out, a_name, new_name) < 0
|
|
|
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
|
|
|
178 close (new);
|
|
|
179 if (a_out >= 0)
|
|
|
180 close (a_out);
|
|
|
181 mark_x (new_name);
|
|
|
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 {
|
|
|
197 int scns;
|
|
|
198 unsigned int bss_end;
|
|
|
199
|
|
|
200 struct scnhdr section[MAX_SECTIONS];
|
|
|
201 struct scnhdr * f_thdr; /* Text section header */
|
|
|
202 struct scnhdr * f_dhdr; /* Data section header */
|
|
|
203 struct scnhdr * f_bhdr; /* Bss section header */
|
|
|
204 struct scnhdr * f_lhdr; /* Loader section header */
|
|
|
205 struct scnhdr * f_tchdr; /* Typechk section header */
|
|
|
206 struct scnhdr * f_dbhdr; /* Debug section header */
|
|
|
207 struct scnhdr * f_xhdr; /* Except section header */
|
|
|
208
|
|
|
209 load_scnptr = orig_load_scnptr = lnnoptr = 0;
|
|
|
210 pagemask = getpagesize () - 1;
|
|
|
211
|
|
|
212 /* Adjust text/data boundary. */
|
|
|
213 data_start = (long) start_of_data ();
|
|
|
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
|
|
|
329 for (scns = 0; scns < f_hdr.f_nscns; scns++)
|
|
|
330 {
|
|
|
331 struct scnhdr *s = §ion[scns];
|
|
|
332
|
|
|
333 if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */
|
|
|
334 {
|
|
|
335 /*
|
|
|
336 * the text_start should probably be o_algntext but that doesn't
|
|
|
337 * seem to change
|
|
|
338 */
|
|
|
339 if (f_ohdr.text_start != 0) /* && scns != 0 */
|
|
|
340 {
|
|
|
341 s->s_size = 512 - (ptr % 512);
|
|
|
342 if (s->s_size == 512)
|
|
|
343 s->s_size = 0;
|
|
|
344 }
|
|
|
345 s->s_scnptr = ptr;
|
|
|
346 }
|
|
286
|
347 else
|
|
0
|
348 {
|
|
|
349 bias = ptr - s->s_scnptr;
|
|
286
|
350 s->s_scnptr = ptr;
|
|
|
351 }
|
|
0
|
352
|
|
|
353 ptr = ptr + s->s_size;
|
|
|
354 }
|
|
|
355 }
|
|
|
356
|
|
|
357 /* fix other pointers */
|
|
|
358 for (scns = 0; scns < f_hdr.f_nscns; scns++)
|
|
|
359 {
|
|
|
360 struct scnhdr *s = §ion[scns];
|
|
|
361
|
|
|
362 if (s->s_relptr != 0)
|
|
|
363 {
|
|
|
364 s->s_relptr += bias;
|
|
|
365 }
|
|
|
366 if (s->s_lnnoptr != 0)
|
|
|
367 {
|
|
|
368 if (lnnoptr == 0) lnnoptr = s->s_lnnoptr;
|
|
|
369 s->s_lnnoptr += bias;
|
|
|
370 }
|
|
|
371 }
|
|
|
372
|
|
|
373 if (f_hdr.f_symptr > 0L)
|
|
|
374 {
|
|
|
375 f_hdr.f_symptr += bias;
|
|
|
376 }
|
|
|
377
|
|
|
378 text_scnptr = f_thdr->s_scnptr;
|
|
|
379 data_scnptr = f_dhdr->s_scnptr;
|
|
|
380 load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
|
|
|
381
|
|
|
382 if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
|
|
383 {
|
|
|
384 PERROR (new_name);
|
|
|
385 }
|
|
|
386
|
|
|
387 if (f_hdr.f_opthdr > 0)
|
|
|
388 {
|
|
|
389 if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
|
|
390 {
|
|
|
391 PERROR (new_name);
|
|
|
392 }
|
|
|
393 }
|
|
|
394
|
|
|
395 for (scns = 0; scns < f_hdr.f_nscns; scns++) {
|
|
|
396 struct scnhdr *s = §ion[scns];
|
|
|
397 if (write (new, s, sizeof (*s)) != sizeof (*s))
|
|
|
398 {
|
|
|
399 PERROR (new_name);
|
|
|
400 }
|
|
|
401 }
|
|
|
402
|
|
|
403 return (0);
|
|
|
404 }
|
|
|
405
|
|
|
406 /* ****************************************************************
|
|
|
407
|
|
|
408 *
|
|
|
409 * Copy the text and data segments from memory to the new a.out
|
|
|
410 */
|
|
|
411 static int
|
|
219
|
412 copy_text_and_data (int new)
|
|
0
|
413 {
|
|
|
414 char *end;
|
|
|
415 char *ptr;
|
|
|
416
|
|
286
|
417 lseek (new, (long) text_scnptr, SEEK_SET);
|
|
0
|
418 ptr = start_of_text () + text_scnptr;
|
|
|
419 end = ptr + f_ohdr.tsize;
|
|
|
420 write_segment (new, ptr, end);
|
|
|
421
|
|
286
|
422 lseek (new, (long) data_scnptr, SEEK_SET);
|
|
|
423 ptr = (char *) f_ohdr.data_start;
|
|
0
|
424 end = ptr + f_ohdr.dsize;
|
|
|
425 write_segment (new, ptr, end);
|
|
|
426
|
|
|
427 return 0;
|
|
|
428 }
|
|
|
429
|
|
|
430 #define UnexBlockSz (1<<12) /* read/write block size */
|
|
286
|
431 static void
|
|
219
|
432 write_segment (int new, char *ptr, char *end)
|
|
0
|
433 {
|
|
|
434 int i, nwrite, ret;
|
|
|
435 char buf[80];
|
|
|
436 extern int errno;
|
|
|
437 char zeros[UnexBlockSz];
|
|
|
438
|
|
|
439 for (i = 0; ptr < end;)
|
|
|
440 {
|
|
|
441 /* distance to next block. */
|
|
|
442 nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr;
|
|
|
443 /* But not beyond specified end. */
|
|
|
444 if (nwrite > end - ptr) nwrite = end - ptr;
|
|
|
445 ret = write (new, ptr, nwrite);
|
|
|
446 /* If write gets a page fault, it means we reached
|
|
|
447 a gap between the old text segment and the old data segment.
|
|
|
448 This gap has probably been remapped into part of the text segment.
|
|
|
449 So write zeros for it. */
|
|
|
450 if (ret == -1 && errno == EFAULT)
|
|
|
451 {
|
|
282
|
452 memset (zeros, 0, nwrite);
|
|
0
|
453 write (new, zeros, nwrite);
|
|
|
454 }
|
|
|
455 else if (nwrite != ret)
|
|
|
456 {
|
|
|
457 sprintf (buf,
|
|
|
458 "unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
|
|
459 (unsigned long)ptr, new, nwrite, ret, errno);
|
|
|
460 PERROR (buf);
|
|
|
461 }
|
|
|
462 i += nwrite;
|
|
|
463 ptr += nwrite;
|
|
|
464 }
|
|
|
465 }
|
|
|
466
|
|
|
467 /* ****************************************************************
|
|
|
468 * copy_sym
|
|
|
469 *
|
|
|
470 * Copy the relocation information and symbol table from the a.out to the new
|
|
|
471 */
|
|
|
472 static int
|
|
219
|
473 copy_sym (int new, int a_out, char *a_name, char *new_name)
|
|
0
|
474 {
|
|
|
475 char page[UnexBlockSz];
|
|
|
476 int n;
|
|
|
477
|
|
|
478 if (a_out < 0)
|
|
|
479 return 0;
|
|
|
480
|
|
|
481 if (orig_load_scnptr == 0L)
|
|
|
482 return 0;
|
|
|
483
|
|
|
484 if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */
|
|
286
|
485 lseek (a_out, lnnoptr, SEEK_SET); /* start copying from there */
|
|
0
|
486 else
|
|
286
|
487 lseek (a_out, orig_load_scnptr, SEEK_SET); /* Position a.out to symtab. */
|
|
0
|
488
|
|
|
489 while ((n = read (a_out, page, sizeof page)) > 0)
|
|
|
490 {
|
|
|
491 if (write (new, page, n) != n)
|
|
|
492 {
|
|
|
493 PERROR (new_name);
|
|
|
494 }
|
|
|
495 }
|
|
|
496 if (n < 0)
|
|
|
497 {
|
|
|
498 PERROR (a_name);
|
|
|
499 }
|
|
|
500 return 0;
|
|
|
501 }
|
|
|
502
|
|
|
503 /* ****************************************************************
|
|
|
504 * mark_x
|
|
|
505 *
|
|
|
506 * After successfully building the new a.out, mark it executable
|
|
|
507 */
|
|
|
508 static void
|
|
219
|
509 mark_x (char *name)
|
|
0
|
510 {
|
|
|
511 struct stat sbuf;
|
|
|
512 int um;
|
|
|
513 int new = 0; /* for PERROR */
|
|
|
514
|
|
|
515 um = umask (777);
|
|
|
516 umask (um);
|
|
|
517 if (stat (name, &sbuf) == -1)
|
|
|
518 {
|
|
|
519 PERROR (name);
|
|
|
520 }
|
|
|
521 sbuf.st_mode |= 0111 & ~um;
|
|
|
522 if (chmod (name, sbuf.st_mode) == -1)
|
|
|
523 PERROR (name);
|
|
|
524 }
|
|
|
525
|
|
286
|
526 static int
|
|
219
|
527 adjust_lnnoptrs (int writedesc, int readdesc, char *new_name)
|
|
0
|
528 {
|
|
|
529 int nsyms;
|
|
|
530 int naux;
|
|
|
531 int new;
|
|
|
532 struct syment symentry;
|
|
|
533 union auxent auxentry;
|
|
|
534
|
|
|
535 if (!lnnoptr || !f_hdr.f_symptr)
|
|
|
536 return 0;
|
|
|
537
|
|
|
538 if ((new = open (new_name, 2)) < 0)
|
|
|
539 {
|
|
|
540 PERROR (new_name);
|
|
|
541 return -1;
|
|
|
542 }
|
|
|
543
|
|
286
|
544 lseek (new, f_hdr.f_symptr, SEEK_SET);
|
|
0
|
545 for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
|
|
546 {
|
|
|
547 read (new, &symentry, SYMESZ);
|
|
|
548 if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL)
|
|
|
549 {
|
|
|
550 symentry.n_value += bias;
|
|
286
|
551 lseek (new, -SYMESZ, SEEK_CUR);
|
|
0
|
552 write (new, &symentry, SYMESZ);
|
|
|
553 }
|
|
|
554
|
|
|
555 for (naux = symentry.n_numaux; naux-- != 0; )
|
|
|
556 {
|
|
|
557 read (new, &auxentry, AUXESZ);
|
|
|
558 nsyms++;
|
|
|
559 if (naux != 0 /* skip csect auxentry (last entry) */
|
|
|
560 && (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT))
|
|
|
561 {
|
|
|
562 auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
|
286
|
563 lseek (new, -AUXESZ, SEEK_CUR);
|
|
0
|
564 write (new, &auxentry, AUXESZ);
|
|
|
565 }
|
|
|
566 }
|
|
|
567 }
|
|
|
568 close (new);
|
|
286
|
569
|
|
|
570 return 0;
|
|
0
|
571 }
|
|
|
572
|
|
286
|
573 static int
|
|
219
|
574 unrelocate_symbols (int new, int a_out, char *a_name, char *new_name)
|
|
0
|
575 {
|
|
|
576 int i;
|
|
|
577 LDHDR ldhdr;
|
|
286
|
578 LDREL ldrel;
|
|
0
|
579 ulong t_reloc = (ulong) &_text - f_ohdr.text_start;
|
|
286
|
580 #ifndef ALIGN_DATA_RELOC
|
|
|
581 ulong d_reloc = (ulong) &_data - f_ohdr.data_start;
|
|
|
582 #else
|
|
|
583 /* This worked (and was needed) before AIX 4.2.
|
|
|
584 I have no idea why. -- Mike */
|
|
0
|
585 ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2);
|
|
286
|
586 #endif
|
|
0
|
587 int * p;
|
|
|
588
|
|
|
589 if (load_scnptr == 0)
|
|
|
590 return 0;
|
|
|
591
|
|
286
|
592 lseek (a_out, orig_load_scnptr, SEEK_SET);
|
|
0
|
593 if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
|
|
|
594 {
|
|
|
595 PERROR (new_name);
|
|
|
596 }
|
|
|
597
|
|
|
598 #define SYMNDX_TEXT 0
|
|
|
599 #define SYMNDX_DATA 1
|
|
|
600 #define SYMNDX_BSS 2
|
|
|
601
|
|
286
|
602 for (i = 0; i < ldhdr.l_nreloc; i++)
|
|
|
603 {
|
|
|
604 lseek (a_out,
|
|
|
605 orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
|
|
606 SEEK_SET);
|
|
0
|
607
|
|
286
|
608 if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ)
|
|
|
609 {
|
|
|
610 PERROR (a_name);
|
|
|
611 }
|
|
0
|
612
|
|
|
613 /* move the BSS loader symbols to the DATA segment */
|
|
286
|
614 if (ldrel.l_symndx == SYMNDX_BSS)
|
|
0
|
615 {
|
|
286
|
616 ldrel.l_symndx = SYMNDX_DATA;
|
|
0
|
617
|
|
|
618 lseek (new,
|
|
|
619 load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
|
286
|
620 SEEK_SET);
|
|
0
|
621
|
|
286
|
622 if (write (new, &ldrel, LDRELSZ) != LDRELSZ)
|
|
0
|
623 {
|
|
|
624 PERROR (new_name);
|
|
|
625 }
|
|
|
626 }
|
|
|
627
|
|
286
|
628 if (ldrel.l_rsecnm == f_ohdr.o_sndata)
|
|
0
|
629 {
|
|
|
630 int orig_int;
|
|
|
631
|
|
|
632 lseek (a_out,
|
|
286
|
633 orig_data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
|
|
|
634 SEEK_SET);
|
|
0
|
635
|
|
|
636 if (read (a_out, (void *) &orig_int, sizeof (orig_int))
|
|
|
637 != sizeof (orig_int))
|
|
|
638 {
|
|
|
639 PERROR (a_name);
|
|
|
640 }
|
|
|
641
|
|
286
|
642 p = (int *) (ldrel.l_vaddr + d_reloc);
|
|
0
|
643
|
|
286
|
644 switch (ldrel.l_symndx) {
|
|
0
|
645 case SYMNDX_TEXT:
|
|
|
646 orig_int = * p - t_reloc;
|
|
|
647 break;
|
|
|
648
|
|
|
649 case SYMNDX_DATA:
|
|
|
650 case SYMNDX_BSS:
|
|
|
651 orig_int = * p - d_reloc;
|
|
|
652 break;
|
|
|
653 }
|
|
|
654
|
|
|
655 if (orig_int != * p)
|
|
|
656 {
|
|
|
657 lseek (new,
|
|
286
|
658 data_scnptr + (ldrel.l_vaddr - f_ohdr.data_start),
|
|
|
659 SEEK_SET);
|
|
0
|
660 if (write (new, (void *) &orig_int, sizeof (orig_int))
|
|
|
661 != sizeof (orig_int))
|
|
|
662 {
|
|
|
663 PERROR (new_name);
|
|
|
664 }
|
|
|
665 }
|
|
|
666 }
|
|
|
667 }
|
|
286
|
668 return 0;
|
|
0
|
669 }
|
