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