1 /* Read HP PA/Risc object files for GDB.
2 Copyright 1991, 1992 Free Software Foundation, Inc.
3 Written by Fred Fish at Cygnus Support.
5 This file is part of GDB.
7 This program 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 of the License, or
10 (at your option) any later version.
12 This program 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 this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #include <time.h> /* For time_t in libbfd.h. */
24 #include <sys/types.h> /* For time_t, if not in time.h. */
33 #include "stabsread.h"
34 #include "gdb-stabs.h"
35 #include "complaints.h"
40 /* Size of n_value and n_strx fields in a stab symbol. */
41 #define BYTES_IN_WORD 4
43 #include "aout/aout64.h"
45 /* Various things we might complain about... */
48 pa_symfile_init PARAMS ((struct objfile *));
51 pa_new_init PARAMS ((struct objfile *));
54 read_unwind_info PARAMS ((struct objfile *));
57 pa_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
60 pa_symfile_finish PARAMS ((struct objfile *));
63 pa_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
66 free_painfo PARAMS ((PTR));
68 static struct section_offsets *
69 pa_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
72 record_minimal_symbol PARAMS ((char *, CORE_ADDR,
73 enum minimal_symbol_type,
77 record_minimal_symbol (name, address, ms_type, objfile)
80 enum minimal_symbol_type ms_type;
81 struct objfile *objfile;
83 name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
84 prim_record_minimal_symbol (name, address, ms_type);
91 pa_symtab_read -- read the symbol table of a PA file
95 void pa_symtab_read (bfd *abfd, CORE_ADDR addr,
96 struct objfile *objfile)
100 Given an open bfd, a base address to relocate symbols to, and a
101 flag that specifies whether or not this bfd is for an executable
102 or not (may be shared library for example), add all the global
103 function and data symbols to the minimal symbol table.
107 pa_symtab_read (abfd, addr, objfile)
110 struct objfile *objfile;
112 unsigned int number_of_symbols;
116 struct symbol_dictionary_record *buf, *bufp, *endbufp;
118 CONST int symsize = sizeof (struct symbol_dictionary_record);
120 number_of_symbols = bfd_get_symcount (abfd);
122 buf = alloca (symsize * number_of_symbols);
123 bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET);
124 val = bfd_read (buf, symsize * number_of_symbols, 1, abfd);
125 if (val != symsize * number_of_symbols)
126 error ("Couldn't read symbol dictionary!");
128 stringtab = alloca (obj_som_stringtab_size (abfd));
129 bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET);
130 val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd);
131 if (val != obj_som_stringtab_size (abfd))
132 error ("Can't read in HP string table.");
134 endbufp = buf + number_of_symbols;
135 for (bufp = buf; bufp < endbufp; ++bufp)
137 enum minimal_symbol_type ms_type;
141 switch (bufp->symbol_scope)
144 switch (bufp->symbol_type)
155 symname = bufp->name.n_strx + stringtab;
157 bufp->symbol_value &= ~0x3; /* clear out permission bits */
160 symname = bufp->name.n_strx + stringtab;
169 /* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */
173 switch (bufp->symbol_type)
180 symname = bufp->name.n_strx + stringtab;
181 ms_type = mst_file_text;
182 bufp->symbol_value &= ~0x3; /* clear out permission bits */
185 /* GAS leaves symbols with the prefixes "LS$", "LBB$",
186 and "LBE$" in .o files after assembling. And thus
187 they appear in the final executable. This can
188 cause problems if these special symbols have the
189 same value as real symbols. So ignore them. Also "LC$". */
191 && (symname[2] == '$' || symname[3] == '$'))
199 symname = bufp->name.n_strx + stringtab;
200 ms_type = mst_file_text;
201 bufp->symbol_value &= ~0x3; /* clear out permission bits */
205 symname = bufp->name.n_strx + stringtab;
206 ms_type = mst_file_data;
207 goto check_strange_names;
218 if (bufp->name.n_strx > obj_som_stringtab_size (abfd))
219 error ("Invalid symbol data; bad HP string table offset: %d",
222 record_minimal_symbol (symname,
223 bufp->symbol_value, ms_type,
227 install_minimal_symbols (objfile);
230 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
231 the object file. This info is used mainly by find_unwind_entry() to find
232 out the stack frame size and frame pointer used by procedures. We put
233 everything on the psymbol obstack in the objfile so that it automatically
234 gets freed when the objfile is destroyed. */
237 read_unwind_info (objfile)
238 struct objfile *objfile;
240 asection *unwind_sec;
241 struct obj_unwind_info *ui;
243 ui = obstack_alloc (&objfile->psymbol_obstack,
244 sizeof (struct obj_unwind_info));
250 unwind_sec = bfd_get_section_by_name (objfile->obfd,
257 size = bfd_section_size (objfile->obfd, unwind_sec);
258 ui->table = obstack_alloc (&objfile->psymbol_obstack, size);
259 ui->last = size / sizeof (struct unwind_table_entry) - 1;
261 bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table,
264 OBJ_UNWIND_INFO (objfile) = ui;
268 /* Scan and build partial symbols for a symbol file.
269 We have been initialized by a call to pa_symfile_init, which
270 currently does nothing.
272 SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
273 in each section. This is ignored, as it isn't needed for the PA.
275 MAINLINE is true if we are reading the main symbol
276 table (as opposed to a shared lib or dynamically loaded file).
278 This function only does the minimum work necessary for letting the
279 user "name" things symbolically; it does not read the entire symtab.
280 Instead, it reads the external and static symbols and puts them in partial
281 symbol tables. When more extensive information is requested of a
282 file, the corresponding partial symbol table is mutated into a full
283 fledged symbol table by going back and reading the symbols
286 We look for sections with specific names, to tell us what debug
287 format to look for: FIXME!!!
289 pastab_build_psymtabs() handles STABS symbols.
291 Note that PA files have a "minimal" symbol table, which is vaguely
292 reminiscent of a COFF symbol table, but has only the minimal information
293 necessary for linking. We process this also, and use the information to
294 build gdb's minimal symbol table. This gives us some minimal debugging
295 capability even for files compiled without -g. */
298 pa_symfile_read (objfile, section_offsets, mainline)
299 struct objfile *objfile;
300 struct section_offsets *section_offsets;
303 bfd *abfd = objfile->obfd;
304 struct cleanup *back_to;
307 init_minimal_symbol_collection ();
308 back_to = make_cleanup (discard_minimal_symbols, 0);
310 make_cleanup (free_painfo, (PTR) objfile);
312 /* Process the normal PA symbol table first. */
314 /* FIXME, should take a section_offsets param, not just an offset. */
316 offset = ANOFFSET (section_offsets, 0);
317 pa_symtab_read (abfd, offset, objfile);
319 /* Now process debugging information, which is contained in
320 special PA sections. */
322 pastab_build_psymtabs (objfile, section_offsets, mainline);
324 read_unwind_info(objfile);
326 do_cleanups (back_to);
329 /* This cleans up the objfile's sym_stab_info pointer, and the chain of
330 stab_section_info's, that might be dangling from it. */
336 struct objfile *objfile = (struct objfile *)objp;
337 struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
338 objfile->sym_stab_info;
339 struct stab_section_info *ssi, *nssi;
341 ssi = dbxinfo->stab_section_info;
345 mfree (objfile->md, ssi);
349 dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
352 /* Initialize anything that needs initializing when a completely new symbol
353 file is specified (not just adding some symbols from another file, e.g. a
356 We reinitialize buildsym, since we may be reading stabs from a PA file. */
360 struct objfile *ignore;
362 stabsread_new_init ();
363 buildsym_new_init ();
366 /* Perform any local cleanups required when we are done with a particular
367 objfile. I.E, we are in the process of discarding all symbol information
368 for an objfile, freeing up all memory held for it, and unlinking the
369 objfile struct from the global list of known objfiles. */
372 pa_symfile_finish (objfile)
373 struct objfile *objfile;
375 if (objfile -> sym_stab_info != NULL)
377 mfree (objfile -> md, objfile -> sym_stab_info);
381 /* PA specific initialization routine for reading symbols.
383 It is passed a pointer to a struct sym_fns which contains, among other
384 things, the BFD for the file whose symbols are being read, and a slot for
385 a pointer to "private data" which we can fill with goodies.
387 This routine is almost a complete ripoff of dbx_symfile_init. The
388 common parts of these routines should be extracted and used instead of
389 duplicating this code. FIXME. */
392 pa_symfile_init (objfile)
393 struct objfile *objfile;
396 bfd *sym_bfd = objfile->obfd;
397 char *name = bfd_get_filename (sym_bfd);
398 asection *stabsect; /* Section containing symbol table entries */
399 asection *stringsect; /* Section containing symbol name strings */
401 stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$");
402 stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$");
404 /* Allocate struct to keep track of the symfile */
405 objfile->sym_stab_info = (PTR)
406 xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
408 memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
414 error ("Found stabs, but not string section");
416 /* FIXME POKING INSIDE BFD DATA STRUCTURES */
417 #define STRING_TABLE_OFFSET (stringsect->filepos)
418 #define SYMBOL_TABLE_OFFSET (stabsect->filepos)
420 /* FIXME POKING INSIDE BFD DATA STRUCTURES */
422 DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
423 DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
424 if (!DBX_TEXT_SECT (objfile))
425 error ("Can't find .text section in symbol file");
427 /* FIXME: I suspect this should be external_nlist. The size of host
428 types like long and bfd_vma should not affect how we read the
430 DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist);
431 DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
432 / DBX_SYMBOL_SIZE (objfile);
433 DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
435 /* Read the string table and stash it away in the psymbol_obstack. It is
436 only needed as long as we need to expand psymbols into full symbols,
437 so when we blow away the psymbol the string table goes away as well.
438 Note that gdb used to use the results of attempting to malloc the
439 string table, based on the size it read, as a form of sanity check
440 for botched byte swapping, on the theory that a byte swapped string
441 table size would be so totally bogus that the malloc would fail. Now
442 that we put in on the psymbol_obstack, we can't do this since gdb gets
443 a fatal error (out of virtual memory) if the size is bogus. We can
444 however at least check to see if the size is zero or some negative
447 DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect);
449 if (DBX_SYMCOUNT (objfile) == 0
450 || DBX_STRINGTAB_SIZE (objfile) == 0)
453 if (DBX_STRINGTAB_SIZE (objfile) <= 0
454 || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
455 error ("ridiculous string table size (%d bytes).",
456 DBX_STRINGTAB_SIZE (objfile));
458 DBX_STRINGTAB (objfile) =
459 (char *) obstack_alloc (&objfile -> psymbol_obstack,
460 DBX_STRINGTAB_SIZE (objfile));
462 /* Now read in the string table in one big gulp. */
464 val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
466 perror_with_name (name);
467 val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
470 error ("End of file reading string table");
472 /* It's possible bfd_read should be setting bfd_error, and we should be
473 checking that. But currently it doesn't set bfd_error. */
474 perror_with_name (name);
475 else if (val != DBX_STRINGTAB_SIZE (objfile))
476 error ("Short read reading string table");
479 /* PA specific parsing routine for section offsets.
481 Plain and simple for now. */
483 static struct section_offsets *
484 pa_symfile_offsets (objfile, addr)
485 struct objfile *objfile;
488 struct section_offsets *section_offsets;
491 objfile->num_sections = SECT_OFF_MAX;
492 section_offsets = (struct section_offsets *)
493 obstack_alloc (&objfile -> psymbol_obstack,
494 sizeof (struct section_offsets)
495 + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
497 for (i = 0; i < SECT_OFF_MAX; i++)
498 ANOFFSET (section_offsets, i) = addr;
500 return section_offsets;
503 /* Register that we are able to handle SOM object file formats. */
505 static struct sym_fns pa_sym_fns =
507 bfd_target_som_flavour
508 pa_new_init, /* sym_new_init: init anything gbl to entire symtab */
509 pa_symfile_init, /* sym_init: read initial info, setup for sym_read() */
510 pa_symfile_read, /* sym_read: read a symbol file into symtab */
511 pa_symfile_finish, /* sym_finish: finished with file, cleanup */
512 pa_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
513 NULL /* next: pointer to next struct sym_fns */
517 _initialize_paread ()
519 add_symtab_fns (&pa_sym_fns);