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[emacs.git] / src / unexapollo.c
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1 /* unexapollo.c -- COFF File UNEXEC for GNU Emacs on Apollo SR10.x
2 Copyright (C) 1988, 1994, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
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 3, or (at your option)
10 any later version.
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.
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
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 /* Written by Leonard N. Zubkoff. */
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
28 #include <fcntl.h>
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>
39 #define DST_RECORD_HDR_SIZE 2
40 #define LONG_ALIGN(X) (((X)+3)&(~3))
43 void
44 unexec (target_file_name, source_file_name)
45 char *target_file_name, *source_file_name;
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");
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)
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;
99 /* Skip over the Text Section Headers. */
100 for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ;
102 Find the First and Last Data Sections and Fixup
103 Section Header Relocation Pointers.
105 first_data_section = last_data_section = (struct scnhdr *) 0;
106 for (; section != sections_limit; section++)
108 if ((section->s_flags & STYP_DATA) != 0)
110 if (first_data_section == (struct scnhdr *) 0)
111 first_data_section = section;
112 last_data_section = section;
114 if (section->s_relptr != 0)
115 section->s_relptr += delta_after_rwdi;
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;
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++)
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)
138 if (first_changed_vaddr == 0)
139 first_changed_vaddr = section->s_vaddr;
140 section->s_vaddr += delta;
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;
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");
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++)
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");
212 /* Correct virtual addresses in .blocks section. */
213 if (blocks_section != (struct scnhdr *) 0)
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)
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)
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++)
253 if (read (target_file, &section_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, &section_base, sizeof (section_base))
264 != sizeof (section_base))
265 error ("cannot write section base");
267 section_offset += comp_unit->data_size;
269 else error ("unexpected dst record type");
273 if (close (source_file) == -1)
274 error("cannot close source file");
275 if (close (target_file) == -1)
276 error ("cannot close target file");
280 static
281 CopyData (target_file, source_file, total_byte_count)
282 int target_file, source_file;
283 long total_byte_count;
285 unsigned char buffer[4096];
286 long byte_count;
287 while (total_byte_count > 0)
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;
300 /* arch-tag: 783ebbdf-7d26-4df8-9469-17a1747dce96
301 (do not change this comment) */