1 /* SOM object file format.
2 Copyright (C) 1993-2014 Free Software Foundation, Inc.
3
4 This file is part of GAS, the GNU Assembler.
5
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3,
9 or (at your option) any later version.
10
11 GAS is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 the GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19 02110-1301, USA.
20
21 Written by the Center for Software Science at the University of Utah
22 and by Cygnus Support. */
23
24 #include "as.h"
25 #include "subsegs.h"
26 #include "aout/stab_gnu.h"
27
28 static int version_seen = 0;
29 static int copyright_seen = 0;
30 static int compiler_seen = 0;
31
32 /* Unused by SOM. */
33
34 void
obj_read_begin_hook(void)35 obj_read_begin_hook (void)
36 {
37 }
38
39 /* Handle a .compiler directive. This is intended to create the
40 compilation unit auxiliary header for MPE such that the linkeditor
41 can handle SOM extraction from archives. The format of the quoted
42 string is "sourcefile language version" and is delimited by blanks. */
43
44 void
obj_som_compiler(int unused ATTRIBUTE_UNUSED)45 obj_som_compiler (int unused ATTRIBUTE_UNUSED)
46 {
47 char *buf;
48 char c;
49 char *filename;
50 char *language_name;
51 char *p;
52 char *version_id;
53
54 if (compiler_seen)
55 {
56 as_bad (_("Only one .compiler pseudo-op per file!"));
57 ignore_rest_of_line ();
58 return;
59 }
60
61 SKIP_WHITESPACE ();
62 if (*input_line_pointer == '\"')
63 {
64 buf = input_line_pointer;
65 ++input_line_pointer;
66 while (is_a_char (next_char_of_string ()))
67 ;
68 c = *input_line_pointer;
69 *input_line_pointer = '\000';
70 }
71 else
72 {
73 as_bad (_("Expected quoted string"));
74 ignore_rest_of_line ();
75 return;
76 }
77
78 /* Parse the quoted string into its component parts. Skip the
79 quote. */
80 filename = buf + 1;
81 p = filename;
82 while (*p != ' ' && *p != '\000')
83 p++;
84 if (*p == '\000')
85 {
86 as_bad (_(".compiler directive missing language and version"));
87 return;
88 }
89 *p = '\000';
90
91 language_name = ++p;
92 while (*p != ' ' && *p != '\000')
93 p++;
94 if (*p == '\000')
95 {
96 as_bad (_(".compiler directive missing version"));
97 return;
98 }
99 *p = '\000';
100
101 version_id = ++p;
102 while (*p != '\000')
103 p++;
104 /* Remove the trailing quote. */
105 *(--p) = '\000';
106
107 compiler_seen = 1;
108 if (! bfd_som_attach_compilation_unit (stdoutput, filename, language_name,
109 "GNU Tools", version_id))
110 {
111 bfd_perror (stdoutput->filename);
112 as_fatal (_("FATAL: Attaching compiler header %s"), stdoutput->filename);
113 }
114 *input_line_pointer = c;
115 demand_empty_rest_of_line ();
116 }
117
118 /* Handle a .version directive. */
119
120 void
obj_som_version(int unused ATTRIBUTE_UNUSED)121 obj_som_version (int unused ATTRIBUTE_UNUSED)
122 {
123 char *version, c;
124
125 if (version_seen)
126 {
127 as_bad (_("Only one .version pseudo-op per file!"));
128 ignore_rest_of_line ();
129 return;
130 }
131
132 SKIP_WHITESPACE ();
133 if (*input_line_pointer == '\"')
134 {
135 version = input_line_pointer;
136 ++input_line_pointer;
137 while (is_a_char (next_char_of_string ()))
138 ;
139 c = *input_line_pointer;
140 *input_line_pointer = '\000';
141 }
142 else
143 {
144 as_bad (_("Expected quoted string"));
145 ignore_rest_of_line ();
146 return;
147 }
148
149 version_seen = 1;
150 if (!bfd_som_attach_aux_hdr (stdoutput, VERSION_AUX_ID, version))
151 as_fatal (_("attaching version header %s: %s"),
152 stdoutput->filename, bfd_errmsg (bfd_get_error ()));
153
154 *input_line_pointer = c;
155 demand_empty_rest_of_line ();
156 }
157
158 /* Handle a .copyright directive. This probably isn't complete, but
159 it's of dubious value anyway and (IMHO) not worth the time to finish.
160 If you care about copyright strings that much, you fix it. */
161
162 void
obj_som_copyright(int unused ATTRIBUTE_UNUSED)163 obj_som_copyright (int unused ATTRIBUTE_UNUSED)
164 {
165 char *copyright, c;
166
167 if (copyright_seen)
168 {
169 as_bad (_("Only one .copyright pseudo-op per file!"));
170 ignore_rest_of_line ();
171 return;
172 }
173
174 SKIP_WHITESPACE ();
175 if (*input_line_pointer == '\"')
176 {
177 copyright = input_line_pointer;
178 ++input_line_pointer;
179 while (is_a_char (next_char_of_string ()))
180 ;
181 c = *input_line_pointer;
182 *input_line_pointer = '\000';
183 }
184 else
185 {
186 as_bad (_("Expected quoted string"));
187 ignore_rest_of_line ();
188 return;
189 }
190
191 copyright_seen = 1;
192 if (!bfd_som_attach_aux_hdr (stdoutput, COPYRIGHT_AUX_ID, copyright))
193 as_fatal (_("attaching copyright header %s: %s"),
194 stdoutput->filename, bfd_errmsg (bfd_get_error ()));
195
196 *input_line_pointer = c;
197 demand_empty_rest_of_line ();
198 }
199
200 /* Perform any initialization necessary for stabs support.
201
202 For SOM we need to create the space which will contain the
203 two stabs subspaces. Additionally we need to set up the
204 space/subspace relationships and set space/subspace attributes
205 which BFD does not understand. */
206
207 void
obj_som_init_stab_section(segT seg)208 obj_som_init_stab_section (segT seg)
209 {
210 segT saved_seg = now_seg;
211 segT space;
212 subsegT saved_subseg = now_subseg;
213 char *p, *file;
214 unsigned int stroff;
215
216 /* Make the space which will contain the debug subspaces. */
217 space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$");
218
219 /* Set SOM specific attributes for the space. In particular we set
220 the space "defined", "private", "sort_key", and "spnum" values.
221
222 Due to a bug in pxdb (called by hpux linker), the sort keys
223 of the various stabs spaces/subspaces need to be "small". We
224 reserve range 72/73 which appear to work well. */
225 obj_set_section_attributes (space, 1, 1, 72, 2);
226 bfd_set_section_alignment (stdoutput, space, 2);
227
228 /* Set the containing space for both stab sections to be $GDB_DEBUG$
229 (just created above). Also set some attributes which BFD does
230 not understand. In particular, access bits, sort keys, and load
231 quadrant. */
232 obj_set_subsection_attributes (seg, space, 0x1f, 73, 0, 0, 0, 0);
233 bfd_set_section_alignment (stdoutput, seg, 2);
234
235 /* Make some space for the first special stab entry and zero the memory.
236 It contains information about the length of this file's
237 stab string and the like. Using it avoids the need to
238 relocate the stab strings.
239
240 The $GDB_STRINGS$ space will be created as a side effect of
241 the call to get_stab_string_offset. */
242 p = frag_more (12);
243 memset (p, 0, 12);
244 as_where (&file, (unsigned int *) NULL);
245 stroff = get_stab_string_offset (file, "$GDB_STRINGS$");
246 know (stroff == 1);
247 md_number_to_chars (p, stroff, 4);
248 seg_info (seg)->stabu.p = p;
249
250 /* Set the containing space for both stab sections to be $GDB_DEBUG$
251 (just created above). Also set some attributes which BFD does
252 not understand. In particular, access bits, sort keys, and load
253 quadrant. */
254 seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$");
255 obj_set_subsection_attributes (seg, space, 0x1f, 72, 0, 0, 0, 0);
256 bfd_set_section_alignment (stdoutput, seg, 2);
257
258 subseg_set (saved_seg, saved_subseg);
259 }
260
261 /* Fill in the counts in the first entry in a .stabs section. */
262
263 static void
adjust_stab_sections(bfd * abfd,asection * sec,void * xxx ATTRIBUTE_UNUSED)264 adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
265 {
266 asection *strsec;
267 char *p;
268 int strsz, nsyms;
269
270 if (strcmp ("$GDB_SYMBOLS$", sec->name))
271 return;
272
273 strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$");
274 if (strsec)
275 strsz = bfd_section_size (abfd, strsec);
276 else
277 strsz = 0;
278 nsyms = bfd_section_size (abfd, sec) / 12 - 1;
279
280 p = seg_info (sec)->stabu.p;
281 gas_assert (p != 0);
282
283 bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6);
284 bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8);
285 }
286
287 /* Called late in the assembly phase to adjust the special
288 stab entry and to set the starting address for each code subspace. */
289
290 void
som_frob_file(void)291 som_frob_file (void)
292 {
293 bfd_map_over_sections (stdoutput, adjust_stab_sections, (void *) 0);
294 }
295
296 static void
obj_som_weak(int ignore ATTRIBUTE_UNUSED)297 obj_som_weak (int ignore ATTRIBUTE_UNUSED)
298 {
299 char *name;
300 int c;
301 symbolS *symbolP;
302
303 do
304 {
305 name = input_line_pointer;
306 c = get_symbol_end ();
307 symbolP = symbol_find_or_make (name);
308 *input_line_pointer = c;
309 SKIP_WHITESPACE ();
310 S_SET_WEAK (symbolP);
311 if (c == ',')
312 {
313 input_line_pointer++;
314 SKIP_WHITESPACE ();
315 if (*input_line_pointer == '\n')
316 c = '\n';
317 }
318 }
319 while (c == ',');
320 demand_empty_rest_of_line ();
321 }
322
323 const pseudo_typeS obj_pseudo_table[] =
324 {
325 {"weak", obj_som_weak, 0},
326 {NULL, NULL, 0}
327 };
328