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