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5303ab61 | 1 | /* unexapollo.c -- COFF File UNEXEC for GNU Emacs on Apollo SR10.x |
0b5538bd | 2 | Copyright (C) 1988, 1994, 2002, 2003, 2004, |
aaef169d | 3 | 2005, 2006 Free Software Foundation, Inc. |
5303ab61 RS |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
5303ab61 RS |
21 | |
22 | /* Written by Leonard N. Zubkoff. */ | |
23 | ||
4838e624 PJ |
24 | #ifdef HAVE_CONFIG_H |
25 | #include <config.h> | |
26 | #endif | |
27 | ||
5303ab61 RS |
28 | #include <fcntl.h> |
29 | ||
30 | ||
31 | #include <a.out.h> | |
32 | #include <sys/file.h> | |
33 | #include <apollo/base.h> | |
34 | #include <apollo/ios.h> | |
35 | #include <apollo/type_uids.h> | |
36 | #include <apollo/dst.h> | |
37 | ||
38 | ||
39 | #define DST_RECORD_HDR_SIZE 2 | |
40 | #define LONG_ALIGN(X) (((X)+3)&(~3)) | |
41 | ||
42 | ||
43 | void | |
44 | unexec (target_file_name, source_file_name) | |
45 | char *target_file_name, *source_file_name; | |
46 | { | |
47 | struct filehdr file_header; | |
48 | struct aouthdr domain_header; | |
49 | struct scnhdr *section, *sections, *sections_limit; | |
50 | struct scnhdr *first_data_section, *last_data_section; | |
51 | struct scnhdr *rwdi_section, *blocks_section; | |
52 | struct reloc reloc_entry; | |
53 | unsigned long data_size, old_data_section_size, source_file_offset_past_rwdi; | |
54 | unsigned char buffer[4096]; | |
55 | long delta_before_rwdi, delta_after_rwdi, byte_count; | |
56 | long first_changed_vaddr, old_rwdi_vaddr, i; | |
57 | ios_$id_t target_file, source_file; | |
58 | status_$t status; | |
59 | /* Open the Source File. */ | |
60 | if ((source_file = open (source_file_name, O_RDONLY)) < 0) | |
61 | error ("cannot open source file for input"); | |
62 | /* Read the File Header. */ | |
63 | if (read (source_file, &file_header, sizeof (file_header)) != sizeof (file_header)) | |
64 | error ("cannot read file header"); | |
65 | \f | |
66 | /* Read the Domain Header. */ | |
67 | if (read (source_file, &domain_header, sizeof (domain_header)) | |
68 | != sizeof (domain_header)) | |
69 | error ("cannot read domain header"); | |
70 | /* Read the Section Headers. */ | |
71 | sections = | |
72 | (struct scnhdr *) malloc (file_header.f_nscns*sizeof (struct scnhdr)); | |
73 | if (sections == (struct scnhdr *) 0) | |
74 | error ("cannot allocate section header storage"); | |
75 | sections_limit = sections + file_header.f_nscns; | |
76 | if (read (source_file, sections, file_header.f_nscns*sizeof (struct scnhdr)) | |
77 | != file_header.f_nscns*sizeof (struct scnhdr)) | |
78 | error ("cannot read section headers"); | |
79 | /* Compute the new Size of the Data Section. */ | |
80 | data_size = sbrk (0) - domain_header.data_start; | |
81 | delta_before_rwdi = delta_after_rwdi = data_size - domain_header.dsize; | |
82 | old_rwdi_vaddr = 0; | |
83 | /* Find and Deallocate the .rwdi Section Information. */ | |
84 | for (rwdi_section = sections; rwdi_section != sections_limit; rwdi_section++) | |
85 | if (strcmp (rwdi_section->s_name, ".rwdi") == 0) | |
86 | { | |
87 | /* If there are relocation entries, we cannot "unrelocate" them. */ | |
88 | if (rwdi_section->s_nreloc > 0) | |
89 | error (".rwdi section needs relocation - cannot dump Emacs"); | |
90 | delta_after_rwdi = delta_before_rwdi - rwdi_section->s_size; | |
91 | old_rwdi_vaddr = rwdi_section->s_vaddr; | |
92 | rwdi_section->s_paddr = 0; | |
93 | rwdi_section->s_vaddr = 0; | |
94 | rwdi_section->s_scnptr = 0; | |
95 | rwdi_section->s_size = 0; | |
96 | source_file_offset_past_rwdi = (rwdi_section+1)->s_scnptr; | |
97 | break; | |
98 | } | |
99 | /* Skip over the Text Section Headers. */ | |
100 | for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ; | |
101 | /* | |
102 | Find the First and Last Data Sections and Fixup | |
103 | Section Header Relocation Pointers. | |
104 | */ | |
105 | first_data_section = last_data_section = (struct scnhdr *) 0; | |
106 | for (; section != sections_limit; section++) | |
107 | { | |
108 | if ((section->s_flags & STYP_DATA) != 0) | |
109 | { | |
110 | if (first_data_section == (struct scnhdr *) 0) | |
111 | first_data_section = section; | |
112 | last_data_section = section; | |
113 | } | |
114 | if (section->s_relptr != 0) | |
115 | section->s_relptr += delta_after_rwdi; | |
116 | } | |
117 | /* Increment the Size of the Last Data Section. */ | |
118 | old_data_section_size = last_data_section->s_size; | |
119 | last_data_section->s_size += delta_before_rwdi; | |
120 | \f | |
121 | /* Update the File Header and Domain Header. */ | |
122 | file_header.f_symptr += delta_after_rwdi; | |
123 | domain_header.dsize = data_size; | |
124 | domain_header.bsize = 0; | |
125 | /* Skip over subsequent Bss Section Headers. */ | |
126 | for (section = last_data_section+1; | |
127 | (section->s_flags & STYP_BSS) != 0; section++) ; | |
128 | /* Update the remaining Section Headers. */ | |
129 | blocks_section = (struct scnhdr *) 0; | |
130 | first_changed_vaddr = 0; | |
131 | for (; section != sections_limit; section++) | |
132 | { | |
133 | long delta = (section < rwdi_section ? delta_before_rwdi : delta_after_rwdi); | |
134 | if (section->s_paddr != 0) | |
135 | section->s_paddr += delta; | |
136 | if (section->s_vaddr != 0) | |
137 | { | |
138 | if (first_changed_vaddr == 0) | |
139 | first_changed_vaddr = section->s_vaddr; | |
140 | section->s_vaddr += delta; | |
141 | } | |
142 | if (section->s_scnptr != 0) | |
143 | section->s_scnptr += delta; | |
144 | if (strcmp (section->s_name, ".blocks") == 0) | |
145 | blocks_section = section; | |
146 | else if (strcmp (section->s_name, ".sri") == 0 && | |
147 | domain_header.o_sri != 0) | |
148 | domain_header.o_sri += delta; | |
149 | else if (strcmp (section->s_name, ".inlib") == 0 && | |
150 | domain_header.o_inlib != 0) | |
151 | domain_header.o_inlib += delta; | |
152 | } | |
153 | /* Open the Target File. */ | |
154 | ios_$create (target_file_name, strlen (target_file_name), coff_$uid, | |
155 | ios_$recreate_mode, ios_$write_opt, &target_file, &status); | |
156 | if (status.all != status_$ok) | |
157 | error ("cannot open target file for output"); | |
158 | /* Write the File Header. */ | |
159 | if (write (target_file, &file_header, sizeof (file_header)) != sizeof (file_header)) | |
160 | error ("cannot write file header"); | |
161 | /* Write the Domain Header. */ | |
162 | if (write (target_file, &domain_header, sizeof (domain_header)) | |
163 | != sizeof (domain_header)) | |
164 | error ("cannot write domain header"); | |
165 | /* Write the Section Headers. */ | |
166 | if (write (target_file, sections, file_header.f_nscns*sizeof (struct scnhdr)) | |
167 | != file_header.f_nscns*sizeof (struct scnhdr)) | |
168 | error ("cannot write section headers"); | |
169 | /* Copy the Allocated Sections. */ | |
170 | for (section = sections; section != first_data_section; section++) | |
171 | if (section->s_scnptr != 0) | |
172 | CopyData (target_file, source_file, LONG_ALIGN(section->s_size)); | |
173 | /* Write the Expanded Data Segment. */ | |
174 | if (write (target_file, first_data_section->s_vaddr, data_size) != data_size) | |
175 | error ("cannot write new data section"); | |
176 | \f | |
177 | /* Skip over the Last Data Section and Copy until the .rwdi Section. */ | |
178 | if (lseek (source_file, last_data_section->s_scnptr | |
179 | +old_data_section_size, L_SET) == -1) | |
180 | error ("cannot seek past data section"); | |
181 | for (section = last_data_section+1; section != rwdi_section; section++) | |
182 | if (section->s_scnptr != 0) | |
183 | CopyData (target_file, source_file, LONG_ALIGN(section->s_size)); | |
184 | /* Skip over the .rwdi Section and Copy Remainder of Source File. */ | |
185 | if (lseek (source_file, source_file_offset_past_rwdi, L_SET) == -1) | |
186 | error ("cannot seek past .rwdi section"); | |
187 | while ((byte_count = read (source_file, buffer, sizeof (buffer))) > 0) | |
188 | if (write (target_file, buffer, byte_count) != byte_count) | |
189 | error ("cannot write data"); | |
190 | /* Unrelocate .data references to Global Symbols. */ | |
191 | for (section = first_data_section; section <= last_data_section; section++) | |
192 | for (i = 0; i < section->s_nreloc; i++) | |
193 | { | |
194 | if (lseek (source_file, section->s_relptr | |
195 | +i*sizeof (struct reloc)-delta_after_rwdi, L_SET) == -1) | |
196 | error ("cannot seek to relocation info"); | |
197 | if (read (source_file, &reloc_entry, sizeof (reloc_entry)) | |
198 | != sizeof (reloc_entry)) | |
199 | error ("cannot read reloc entry"); | |
200 | if (lseek (source_file, reloc_entry.r_vaddr-section->s_vaddr | |
201 | +section->s_scnptr, L_SET) == -1) | |
202 | error ("cannot seek to data element"); | |
203 | if (lseek (target_file, reloc_entry.r_vaddr-section->s_vaddr | |
204 | +section->s_scnptr, L_SET) == -1) | |
205 | error ("cannot seek to data element"); | |
206 | if (read (source_file, buffer, 4) != 4) | |
207 | error ("cannot read data element"); | |
208 | if (write (target_file, buffer, 4) != 4) | |
209 | error ("cannot write data element"); | |
210 | } | |
211 | \f | |
212 | /* Correct virtual addresses in .blocks section. */ | |
213 | if (blocks_section != (struct scnhdr *) 0) | |
214 | { | |
215 | dst_rec_t dst_record; | |
216 | dst_rec_comp_unit_t *comp_unit; | |
217 | unsigned short number_of_sections; | |
218 | unsigned long section_base; | |
219 | unsigned long section_offset = 0; | |
220 | /* Find section tables and update section base addresses. */ | |
221 | while (section_offset < blocks_section->s_size) | |
222 | { | |
223 | if (lseek (target_file, | |
224 | blocks_section->s_scnptr+section_offset, L_SET) == -1) | |
225 | error ("cannot seek to comp unit record"); | |
226 | /* Handle pad records before the comp unit record. */ | |
227 | if (read (target_file, &dst_record, DST_RECORD_HDR_SIZE) | |
228 | != DST_RECORD_HDR_SIZE) | |
229 | error ("cannot read dst record tag"); | |
230 | if (dst_record.rec_type == dst_typ_pad) | |
231 | section_offset += DST_RECORD_HDR_SIZE; | |
232 | else if (dst_record.rec_type == dst_typ_comp_unit) | |
233 | { | |
234 | comp_unit = &dst_record.rec_data.comp_unit_; | |
235 | if (read (target_file, comp_unit, sizeof (*comp_unit)) | |
236 | != sizeof (*comp_unit)) | |
237 | error ("cannot read comp unit record"); | |
238 | if (lseek (target_file, blocks_section->s_scnptr | |
239 | +section_offset | |
240 | #if dst_version_major == 1 && dst_version_minor < 4 | |
241 | +comp_unit->section_table | |
242 | #else | |
243 | +comp_unit->section_table.rel_offset | |
244 | #endif | |
245 | +DST_RECORD_HDR_SIZE, | |
246 | L_SET) == -1) | |
247 | error ("cannot seek to section table"); | |
248 | if (read (target_file, &number_of_sections, sizeof (number_of_sections)) | |
249 | != sizeof (number_of_sections)) | |
250 | error ("cannot read section table size"); | |
251 | for (i = 0; i < number_of_sections; i++) | |
252 | { | |
253 | if (read (target_file, §ion_base, sizeof (section_base)) | |
254 | != sizeof (section_base)) | |
255 | error ("cannot read section base value"); | |
256 | if (section_base < first_changed_vaddr) | |
257 | continue; | |
258 | else if (section_base < old_rwdi_vaddr) | |
259 | section_base += delta_before_rwdi; | |
260 | else section_base += delta_after_rwdi; | |
261 | if (lseek (target_file, -sizeof (section_base), L_INCR) == -1) | |
262 | error ("cannot seek to section base value"); | |
263 | if (write (target_file, §ion_base, sizeof (section_base)) | |
264 | != sizeof (section_base)) | |
265 | error ("cannot write section base"); | |
266 | } | |
267 | section_offset += comp_unit->data_size; | |
268 | } | |
269 | else error ("unexpected dst record type"); | |
270 | } | |
271 | } | |
272 | \f | |
273 | if (close (source_file) == -1) | |
274 | error("cannot close source file"); | |
275 | if (close (target_file) == -1) | |
276 | error ("cannot close target file"); | |
277 | } | |
278 | ||
279 | ||
280 | static | |
281 | CopyData (target_file, source_file, total_byte_count) | |
282 | int target_file, source_file; | |
283 | long total_byte_count; | |
284 | { | |
285 | unsigned char buffer[4096]; | |
286 | long byte_count; | |
287 | while (total_byte_count > 0) | |
288 | { | |
289 | if (total_byte_count > sizeof (buffer)) | |
290 | byte_count = sizeof (buffer); | |
291 | else byte_count = total_byte_count; | |
292 | if (read (source_file, buffer, byte_count) != byte_count) | |
293 | error ("cannot read data"); | |
294 | if (write (target_file, buffer, byte_count) != byte_count) | |
295 | error ("cannot write data"); | |
296 | total_byte_count -= byte_count; | |
297 | } | |
298 | } | |
ab5796a9 MB |
299 | |
300 | /* arch-tag: 783ebbdf-7d26-4df8-9469-17a1747dce96 | |
301 | (do not change this comment) */ |