Mercurial > hg > xemacs-beta

comparison src/unexapollo.c @ 428:3ecd8885ac67 r21-2-22

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import from CVS: tag r21-2-22
author cvs
date Mon, 13 Aug 2007 11:28:15 +0200
parents
children 183866b06e0b
comparison
equal deleted inserted replaced
427:0a0253eac470 428:3ecd8885ac67
1 /* unexapollo.c -- COFF File UNEXEC for GNU Emacs on Apollo SR10.x
2 Copyright (C) 1988, 1994 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 /* Synched up with: FSF 19.31. */
22
23 /* Written by Leonard N. Zubkoff. */
24
25 #include <config.h>
26 #include <fcntl.h>
27
28
29 #include <a.out.h>
30 #include <sys/file.h>
31 #include <apollo/base.h>
32 #include <apollo/ios.h>
33 #include <apollo/type_uids.h>
34 #include <apollo/dst.h>
35
36
37 #define DST_RECORD_HDR_SIZE 2
38 #define LONG_ALIGN(X) (((X)+3)&(~3))
39
40
41 void
42 unexec (target_file_name, source_file_name)
43 char *target_file_name, *source_file_name;
44 {
45 struct filehdr file_header;
46 struct aouthdr domain_header;
47 struct scnhdr *section, *sections, *sections_limit;
48 struct scnhdr *first_data_section, *last_data_section;
49 struct scnhdr *rwdi_section, *blocks_section;
50 struct reloc reloc_entry;
51 unsigned long data_size, old_data_section_size, source_file_offset_past_rwdi;
52 unsigned char buffer[4096];
53 long delta_before_rwdi, delta_after_rwdi, byte_count;
54 long first_changed_vaddr, old_rwdi_vaddr, i;
55 ios_$id_t target_file, source_file;
56 status_$t status;
57 /* Open the Source File. */
58 if ((source_file = open (source_file_name, O_RDONLY)) < 0)
59 error ("cannot open source file for input");
60 /* Read the File Header. */
61 if (read (source_file, &file_header, sizeof (file_header)) != sizeof (file_header))
62 error ("cannot read file header");
63
64 /* Read the Domain Header. */
65 if (read (source_file, &domain_header, sizeof (domain_header))
66 != sizeof (domain_header))
67 error ("cannot read domain header");
68 /* Read the Section Headers. */
69 sections =
70 (struct scnhdr *) malloc (file_header.f_nscns*sizeof (struct scnhdr));
71 if (sections == (struct scnhdr *) 0)
72 error ("cannot allocate section header storage");
73 sections_limit = sections + file_header.f_nscns;
74 if (read (source_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
75 != file_header.f_nscns*sizeof (struct scnhdr))
76 error ("cannot read section headers");
77 /* Compute the new Size of the Data Section. */
78 data_size = sbrk (0) - domain_header.data_start;
79 delta_before_rwdi = delta_after_rwdi = data_size - domain_header.dsize;
80 old_rwdi_vaddr = 0;
81 /* Find and Deallocate the .rwdi Section Information. */
82 for (rwdi_section = sections; rwdi_section != sections_limit; rwdi_section++)
83 if (strcmp (rwdi_section->s_name, ".rwdi") == 0)
84 {
85 /* If there are relocation entries, we cannot "unrelocate" them. */
86 if (rwdi_section->s_nreloc > 0)
87 error (".rwdi section needs relocation - cannot dump Emacs");
88 delta_after_rwdi = delta_before_rwdi - rwdi_section->s_size;
89 old_rwdi_vaddr = rwdi_section->s_vaddr;
90 rwdi_section->s_paddr = 0;
91 rwdi_section->s_vaddr = 0;
92 rwdi_section->s_scnptr = 0;
93 rwdi_section->s_size = 0;
94 source_file_offset_past_rwdi = (rwdi_section+1)->s_scnptr;
95 break;
96 }
97 /* Skip over the Text Section Headers. */
98 for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ;
99 /*
100 Find the First and Last Data Sections and Fixup
101 Section Header Relocation Pointers.
102 */
103 first_data_section = last_data_section = (struct scnhdr *) 0;
104 for (; section != sections_limit; section++)
105 {
106 if ((section->s_flags & STYP_DATA) != 0)
107 {
108 if (first_data_section == (struct scnhdr *) 0)
109 first_data_section = section;
110 last_data_section = section;
111 }
112 if (section->s_relptr != 0)
113 section->s_relptr += delta_after_rwdi;
114 }
115 /* Increment the Size of the Last Data Section. */
116 old_data_section_size = last_data_section->s_size;
117 last_data_section->s_size += delta_before_rwdi;
118
119 /* Update the File Header and Domain Header. */
120 file_header.f_symptr += delta_after_rwdi;
121 domain_header.dsize = data_size;
122 domain_header.bsize = 0;
123 /* Skip over subsequent Bss Section Headers. */
124 for (section = last_data_section+1;
125 (section->s_flags & STYP_BSS) != 0; section++) ;
126 /* Update the remaining Section Headers. */
127 blocks_section = (struct scnhdr *) 0;
128 first_changed_vaddr = 0;
129 for (; section != sections_limit; section++)
130 {
131 long delta = (section < rwdi_section ? delta_before_rwdi : delta_after_rwdi);
132 if (section->s_paddr != 0)
133 section->s_paddr += delta;
134 if (section->s_vaddr != 0)
135 {
136 if (first_changed_vaddr == 0)
137 first_changed_vaddr = section->s_vaddr;
138 section->s_vaddr += delta;
139 }
140 if (section->s_scnptr != 0)
141 section->s_scnptr += delta;
142 if (strcmp (section->s_name, ".blocks") == 0)
143 blocks_section = section;
144 else if (strcmp (section->s_name, ".sri") == 0 &&
145 domain_header.o_sri != 0)
146 domain_header.o_sri += delta;
147 else if (strcmp (section->s_name, ".inlib") == 0 &&
148 domain_header.o_inlib != 0)
149 domain_header.o_inlib += delta;
150 }
151 /* Open the Target File. */
152 ios_$create (target_file_name, strlen (target_file_name), coff_$uid,
153 ios_$recreate_mode, ios_$write_opt, &target_file, &status);
154 if (status.all != status_$ok)
155 error ("cannot open target file for output");
156 /* Write the File Header. */
157 if (write (target_file, &file_header, sizeof (file_header)) != sizeof (file_header))
158 error ("cannot write file header");
159 /* Write the Domain Header. */
160 if (write (target_file, &domain_header, sizeof (domain_header))
161 != sizeof (domain_header))
162 error ("cannot write domain header");
163 /* Write the Section Headers. */
164 if (write (target_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
165 != file_header.f_nscns*sizeof (struct scnhdr))
166 error ("cannot write section headers");
167 /* Copy the Allocated Sections. */
168 for (section = sections; section != first_data_section; section++)
169 if (section->s_scnptr != 0)
170 CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
171 /* Write the Expanded Data Segment. */
172 if (write (target_file, first_data_section->s_vaddr, data_size) != data_size)
173 error ("cannot write new data section");
174
175 /* Skip over the Last Data Section and Copy until the .rwdi Section. */
176 if (lseek (source_file, last_data_section->s_scnptr
177 +old_data_section_size, L_SET) == -1)
178 error ("cannot seek past data section");
179 for (section = last_data_section+1; section != rwdi_section; section++)
180 if (section->s_scnptr != 0)
181 CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
182 /* Skip over the .rwdi Section and Copy Remainder of Source File. */
183 if (lseek (source_file, source_file_offset_past_rwdi, L_SET) == -1)
184 error ("cannot seek past .rwdi section");
185 while ((byte_count = read (source_file, buffer, sizeof (buffer))) > 0)
186 if (write (target_file, buffer, byte_count) != byte_count)
187 error ("cannot write data");
188 /* Unrelocate .data references to Global Symbols. */
189 for (section = first_data_section; section <= last_data_section; section++)
190 for (i = 0; i < section->s_nreloc; i++)
191 {
192 if (lseek (source_file, section->s_relptr
193 +i*sizeof (struct reloc)-delta_after_rwdi, L_SET) == -1)
194 error ("cannot seek to relocation info");
195 if (read (source_file, &reloc_entry, sizeof (reloc_entry))
196 != sizeof (reloc_entry))
197 error ("cannot read reloc entry");
198 if (lseek (source_file, reloc_entry.r_vaddr-section->s_vaddr
199 +section->s_scnptr, L_SET) == -1)
200 error ("cannot seek to data element");
201 if (lseek (target_file, reloc_entry.r_vaddr-section->s_vaddr
202 +section->s_scnptr, L_SET) == -1)
203 error ("cannot seek to data element");
204 if (read (source_file, buffer, 4) != 4)
205 error ("cannot read data element");
206 if (write (target_file, buffer, 4) != 4)
207 error ("cannot write data element");
208 }
209
210 /* Correct virtual addresses in .blocks section. */
211 if (blocks_section != (struct scnhdr *) 0)
212 {
213 dst_rec_t dst_record;
214 dst_rec_comp_unit_t *comp_unit;
215 unsigned short number_of_sections;
216 unsigned long section_base;
217 unsigned long section_offset = 0;
218 /* Find section tables and update section base addresses. */
219 while (section_offset < blocks_section->s_size)
220 {
221 if (lseek (target_file,
222 blocks_section->s_scnptr+section_offset, L_SET) == -1)
223 error ("cannot seek to comp unit record");
224 /* Handle pad records before the comp unit record. */
225 if (read (target_file, &dst_record, DST_RECORD_HDR_SIZE)
226 != DST_RECORD_HDR_SIZE)
227 error ("cannot read dst record tag");
228 if (dst_record.rec_type == dst_typ_pad)
229 section_offset += DST_RECORD_HDR_SIZE;
230 else if (dst_record.rec_type == dst_typ_comp_unit)
231 {
232 comp_unit = &dst_record.rec_data.comp_unit_;
233 if (read (target_file, comp_unit, sizeof (*comp_unit))
234 != sizeof (*comp_unit))
235 error ("cannot read comp unit record");
236 if (lseek (target_file, blocks_section->s_scnptr
237 +section_offset
238 #if dst_version_major == 1 && dst_version_minor < 4
239 +comp_unit->section_table
240 #else
241 +comp_unit->section_table.rel_offset
242 #endif
243 +DST_RECORD_HDR_SIZE,
244 L_SET) == -1)
245 error ("cannot seek to section table");
246 if (read (target_file, &number_of_sections, sizeof (number_of_sections))
247 != sizeof (number_of_sections))
248 error ("cannot read section table size");
249 for (i = 0; i < number_of_sections; i++)
250 {
251 if (read (target_file, &section_base, sizeof (section_base))
252 != sizeof (section_base))
253 error ("cannot read section base value");
254 if (section_base < first_changed_vaddr)
255 continue;
256 else if (section_base < old_rwdi_vaddr)
257 section_base += delta_before_rwdi;
258 else section_base += delta_after_rwdi;
259 if (lseek (target_file, -sizeof (section_base), L_INCR) == -1)
260 error ("cannot seek to section base value");
261 if (write (target_file, &section_base, sizeof (section_base))
262 != sizeof (section_base))
263 error ("cannot write section base");
264 }
265 section_offset += comp_unit->data_size;
266 }
267 else error ("unexpected dst record type");
268 }
269 }
270
271 if (close (source_file) == -1)
272 error("cannot close source file");
273 if (close (target_file) == -1)
274 error ("cannot close target file");
275 }
276
277
278 static
279 CopyData (target_file, source_file, total_byte_count)
280 int target_file, source_file;
281 long total_byte_count;
282 {
283 unsigned char buffer[4096];
284 long byte_count;
285 while (total_byte_count > 0)
286 {
287 if (total_byte_count > sizeof (buffer))
288 byte_count = sizeof (buffer);
289 else byte_count = total_byte_count;
290 if (read (source_file, buffer, byte_count) != byte_count)
291 error ("cannot read data");
292 if (write (target_file, buffer, byte_count) != byte_count)
293 error ("cannot write data");
294 total_byte_count -= byte_count;
295 }
296 }