[deliverable/binutils-gdb.git] / gdb / somread.c

/* Read HP PA/Risc object files for GDB.
   Copyright 1991, 1992 Free Software Foundation, Inc.
   Written by Fred Fish at Cygnus Support.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "bfd.h"
#include "som.h"
#include "libhppa.h"
#include <syms.h>
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "buildsym.h"
#include "stabsread.h"
#include "gdb-stabs.h"
#include "complaints.h"
#include <string.h>
#include "demangle.h"
#include <sys/file.h>

/* Various things we might complain about... */

static void
som_symfile_init PARAMS ((struct objfile *));

static void
som_new_init PARAMS ((struct objfile *));

static void
som_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));

static void
som_symfile_finish PARAMS ((struct objfile *));

static void
som_symtab_read PARAMS ((bfd *, struct objfile *,
			 struct section_offsets *));

static struct section_offsets *
som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));

static void
record_minimal_symbol PARAMS ((char *, CORE_ADDR,
			       enum minimal_symbol_type,
			       struct objfile *));

static void
record_minimal_symbol (name, address, ms_type, objfile)
     char *name;
     CORE_ADDR address;
     enum minimal_symbol_type ms_type;
     struct objfile *objfile;
{
  name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
  prim_record_minimal_symbol (name, address, ms_type, objfile);
}

/*

LOCAL FUNCTION

	som_symtab_read -- read the symbol table of a SOM file

SYNOPSIS

	void som_symtab_read (bfd *abfd, struct objfile *objfile,
			      struct section_offsets *section_offsets)

DESCRIPTION

	Given an open bfd, a base address to relocate symbols to, and a
	flag that specifies whether or not this bfd is for an executable
	or not (may be shared library for example), add all the global
	function and data symbols to the minimal symbol table.
*/

static void
som_symtab_read (abfd, objfile, section_offsets)
     bfd *abfd;
     struct objfile *objfile;
     struct section_offsets *section_offsets;
{
  unsigned int number_of_symbols;
  int val, dynamic;
  char *stringtab;
  asection *shlib_info;
  struct symbol_dictionary_record *buf, *bufp, *endbufp;
  char *symname;
  CONST int symsize = sizeof (struct symbol_dictionary_record);
  CORE_ADDR text_offset, data_offset;


  text_offset = ANOFFSET (section_offsets, 0);
  data_offset = ANOFFSET (section_offsets, 1);

  number_of_symbols = bfd_get_symcount (abfd);

  buf = alloca (symsize * number_of_symbols);
  bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET);
  val = bfd_read (buf, symsize * number_of_symbols, 1, abfd);
  if (val != symsize * number_of_symbols)
    error ("Couldn't read symbol dictionary!");

  stringtab = alloca (obj_som_stringtab_size (abfd));
  bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET);
  val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd);
  if (val != obj_som_stringtab_size (abfd))
    error ("Can't read in HP string table.");

  /* We need to determine if objfile is a dynamic executable (so we
     can do the right thing for ST_ENTRY vs ST_CODE symbols).

     There's nothing in the header which easily allows us to do
     this.  The only reliable way I know of is to check for the
     existance of a $SHLIB_INFO$ section with a non-zero size.  */
  shlib_info = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$");
  if (shlib_info)
    dynamic = (bfd_section_size (objfile->obfd, shlib_info) != 0);
  else
    dynamic = 0;

  endbufp = buf + number_of_symbols;
  for (bufp = buf; bufp < endbufp; ++bufp)
    {
      enum minimal_symbol_type ms_type;

      QUIT;

      switch (bufp->symbol_scope)
	{
	case SS_UNIVERSAL:
	case SS_EXTERNAL:
	  switch (bufp->symbol_type)
	    {
	    case ST_SYM_EXT:
	    case ST_ARG_EXT:
	      continue;

	    case ST_CODE:
	    case ST_PRI_PROG:
	    case ST_SEC_PROG:
	    case ST_MILLICODE:
	      symname = bufp->name.n_strx + stringtab;
	      ms_type = mst_text;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;

	    case ST_ENTRY:
	      symname = bufp->name.n_strx + stringtab;
	      /* For a dynamic executable, ST_ENTRY symbols are
		 the stubs, while the ST_CODE symbol is the real
		 function.  */
	      if (dynamic)
		ms_type = mst_solib_trampoline;
	      else
		ms_type = mst_text;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;

	    case ST_STUB:
	      symname = bufp->name.n_strx + stringtab;
	      ms_type = mst_solib_trampoline;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;

	    case ST_DATA:
	      symname = bufp->name.n_strx + stringtab;
	      bufp->symbol_value += data_offset;
	      ms_type = mst_data;
	      break;
	    default:
	      continue;
	    }
	  break;

#if 0
	  /* SS_GLOBAL and SS_LOCAL are two names for the same thing (!).  */
	case SS_GLOBAL:
#endif
	case SS_LOCAL:
	  switch (bufp->symbol_type)
	    {
	    case ST_SYM_EXT:
	    case ST_ARG_EXT:
	      continue;

	    case ST_CODE:
	      symname = bufp->name.n_strx + stringtab;
	      ms_type = mst_file_text;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif

	    check_strange_names:
	      /* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local
		 label prefixes for stabs, constant data, etc.  So we need
		 only filter out L$ symbols which are left in due to
		 limitations in how GAS generates SOM relocations.

		 When linking in the HPUX C-library the HP linker has
		 the nasty habit of placing section symbols from the literal
		 subspaces in the middle of the program's text.  Filter
		 those out as best we can.  Check for first and last character
		 being '$'.  */
	      if ((symname[0] == 'L' && symname[1] == '$')
		  || (symname[0] == '$' && symname[strlen(symname) - 1] == '$'))
		continue;
	      break;

	    case ST_PRI_PROG:
	    case ST_SEC_PROG:
	    case ST_MILLICODE:
	      symname = bufp->name.n_strx + stringtab;
	      ms_type = mst_file_text;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;

	    case ST_ENTRY:
	      symname = bufp->name.n_strx + stringtab;
	      /* For a dynamic executable, ST_ENTRY symbols are
		 the stubs, while the ST_CODE symbol is the real
		 function.  */
	      if (dynamic)
		ms_type = mst_solib_trampoline;
	      else
		ms_type = mst_file_text;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;

	    case ST_STUB:
	      symname = bufp->name.n_strx + stringtab;
	      ms_type = mst_solib_trampoline;
	      bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
	      SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
	      break;


	    case ST_DATA:
	      symname = bufp->name.n_strx + stringtab;
	      bufp->symbol_value += data_offset;
	      ms_type = mst_file_data;
	      goto check_strange_names;

	    default:
	      continue;
	    }
	  break;

	default:
	  continue;
	}

      if (bufp->name.n_strx > obj_som_stringtab_size (abfd))
	error ("Invalid symbol data; bad HP string table offset: %d",
	       bufp->name.n_strx);

      record_minimal_symbol (symname,
			     bufp->symbol_value, ms_type, 
			     objfile);
    }
}

/* Scan and build partial symbols for a symbol file.
   We have been initialized by a call to som_symfile_init, which 
   currently does nothing.

   SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
   in each section.  This is ignored, as it isn't needed for SOM.

   MAINLINE is true if we are reading the main symbol
   table (as opposed to a shared lib or dynamically loaded file).

   This function only does the minimum work necessary for letting the
   user "name" things symbolically; it does not read the entire symtab.
   Instead, it reads the external and static symbols and puts them in partial
   symbol tables.  When more extensive information is requested of a
   file, the corresponding partial symbol table is mutated into a full
   fledged symbol table by going back and reading the symbols
   for real.

   We look for sections with specific names, to tell us what debug
   format to look for:  FIXME!!!

   somstab_build_psymtabs() handles STABS symbols.

   Note that SOM files have a "minimal" symbol table, which is vaguely
   reminiscent of a COFF symbol table, but has only the minimal information
   necessary for linking.  We process this also, and use the information to
   build gdb's minimal symbol table.  This gives us some minimal debugging
   capability even for files compiled without -g.  */

static void
som_symfile_read (objfile, section_offsets, mainline)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     int mainline;
{
  bfd *abfd = objfile->obfd;
  struct cleanup *back_to;

  init_minimal_symbol_collection ();
  back_to = make_cleanup (discard_minimal_symbols, 0);

  /* Process the normal SOM symbol table first. */

  som_symtab_read (abfd, objfile, section_offsets);

  /* Now read information from the stabs debug sections.  */
  stabsect_build_psymtabs (objfile, section_offsets, mainline,
			   "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$");

  /* Now read the native debug information.  */
  hpread_build_psymtabs (objfile, section_offsets, mainline);

  /* Install any minimal symbols that have been collected as the current
     minimal symbols for this objfile.  */
  install_minimal_symbols (objfile);

  /* Force hppa-tdep.c to re-read the unwind descriptors.  */
  objfile->obj_private = NULL;
  do_cleanups (back_to);
}

/* Initialize anything that needs initializing when a completely new symbol
   file is specified (not just adding some symbols from another file, e.g. a
   shared library).

   We reinitialize buildsym, since we may be reading stabs from a SOM file.  */

static void
som_new_init (ignore)
     struct objfile *ignore;
{
  stabsread_new_init ();
  buildsym_new_init ();
}

/* Perform any local cleanups required when we are done with a particular
   objfile.  I.E, we are in the process of discarding all symbol information
   for an objfile, freeing up all memory held for it, and unlinking the
   objfile struct from the global list of known objfiles. */

static void
som_symfile_finish (objfile)
     struct objfile *objfile;
{
  if (objfile -> sym_stab_info != NULL)
    {
      mfree (objfile -> md, objfile -> sym_stab_info);
    }
  hpread_symfile_finish (objfile);
}

/* SOM specific initialization routine for reading symbols.

   Nothing SOM specific left to do anymore.  */
static void
som_symfile_init (objfile)
     struct objfile *objfile;
{
  hpread_symfile_init (objfile);
}

/* SOM specific parsing routine for section offsets.

   Plain and simple for now.  */

static struct section_offsets *
som_symfile_offsets (objfile, addr)
     struct objfile *objfile;
     CORE_ADDR addr;
{
  struct section_offsets *section_offsets;
  int i;

  objfile->num_sections = SECT_OFF_MAX;
  section_offsets = (struct section_offsets *)
    obstack_alloc (&objfile -> psymbol_obstack,
		   sizeof (struct section_offsets)
		   + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));

  /* First see if we're a shared library.  If so, get the section
     offsets from the library, else get them from addr.  */
  if (!som_solib_section_offsets (objfile, section_offsets))
    {
      for (i = 0; i < SECT_OFF_MAX; i++)
	ANOFFSET (section_offsets, i) = addr;
    }

  return section_offsets;
}
\f
/* Register that we are able to handle SOM object file formats.  */

static struct sym_fns som_sym_fns =
{
  bfd_target_som_flavour,
  som_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  som_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  som_symfile_read,	/* sym_read: read a symbol file into symtab */
  som_symfile_finish,	/* sym_finish: finished with file, cleanup */
  som_symfile_offsets,	/* sym_offsets:  Translate ext. to int. relocation */
  NULL			/* next: pointer to next struct sym_fns */
};

void
_initialize_somread ()
{
  add_symtab_fns (&som_sym_fns);
}
Commit	Line	Data
bfe2f12b JL	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.
	4
	5	This file is part of GDB.
	6
	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.
	11
	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.
	16
	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. */
	20
	21	#include "defs.h"
	22	#include "bfd.h"
bfe2f12b JL	23	#include "som.h"
	24	#include "libhppa.h"
	25	#include <syms.h>
	26	#include "symtab.h"
	27	#include "symfile.h"
	28	#include "objfiles.h"
	29	#include "buildsym.h"
	30	#include "stabsread.h"
	31	#include "gdb-stabs.h"
	32	#include "complaints.h"
	33	#include <string.h>
	34	#include "demangle.h"
	35	#include <sys/file.h>
	36
bfe2f12b JL	37	/* Various things we might complain about... */
	38
	39	static void
6a86fa48	40	som_symfile_init PARAMS ((struct objfile *));
bfe2f12b JL	41
	42	static void
	43	som_new_init PARAMS ((struct objfile *));
	44
	45	static void
	46	som_symfile_read PARAMS ((struct objfile , struct section_offsets , int));
	47
	48	static void
	49	som_symfile_finish PARAMS ((struct objfile *));
	50
	51	static void
bb140953 JL	52	som_symtab_read PARAMS ((bfd , struct objfile ,
bb140953 JL	53	struct section_offsets *));
bfe2f12b	54
bfe2f12b JL	55	static struct section_offsets *
	56	som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
	57
	58	static void
	59	record_minimal_symbol PARAMS ((char *, CORE_ADDR,
	60	enum minimal_symbol_type,
	61	struct objfile *));
	62
	63	static void
	64	record_minimal_symbol (name, address, ms_type, objfile)
	65	char *name;
	66	CORE_ADDR address;
	67	enum minimal_symbol_type ms_type;
	68	struct objfile *objfile;
	69	{
	70	name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
	71	prim_record_minimal_symbol (name, address, ms_type, objfile);
	72	}
	73
	74	/*
	75
	76	LOCAL FUNCTION
	77
	78	som_symtab_read -- read the symbol table of a SOM file
	79
	80	SYNOPSIS
	81
bb140953 JL	82	void som_symtab_read (bfd abfd, struct objfile objfile,
bb140953 JL	83	struct section_offsets *section_offsets)
bfe2f12b JL	84
	85	DESCRIPTION
	86
	87	Given an open bfd, a base address to relocate symbols to, and a
	88	flag that specifies whether or not this bfd is for an executable
	89	or not (may be shared library for example), add all the global
	90	function and data symbols to the minimal symbol table.
	91	*/
	92
	93	static void
bb140953	94	som_symtab_read (abfd, objfile, section_offsets)
bfe2f12b	95	bfd *abfd;
bfe2f12b	96	struct objfile *objfile;
bb140953	97	struct section_offsets *section_offsets;
bfe2f12b JL	98	{
bfe2f12b JL	99	unsigned int number_of_symbols;
bfe2f12b JL	100	int val, dynamic;
	101	char *stringtab;
	102	asection *shlib_info;
	103	struct symbol_dictionary_record buf, bufp, *endbufp;
	104	char *symname;
	105	CONST int symsize = sizeof (struct symbol_dictionary_record);
506af7a7	106	CORE_ADDR text_offset, data_offset;
bb140953 JL	107
bb140953 JL	108
bb140953	109	text_offset = ANOFFSET (section_offsets, 0);
506af7a7	110	data_offset = ANOFFSET (section_offsets, 1);
bfe2f12b JL	111
	112	number_of_symbols = bfd_get_symcount (abfd);
	113
	114	buf = alloca (symsize * number_of_symbols);
	115	bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET);
	116	val = bfd_read (buf, symsize * number_of_symbols, 1, abfd);
	117	if (val != symsize * number_of_symbols)
	118	error ("Couldn't read symbol dictionary!");
	119
	120	stringtab = alloca (obj_som_stringtab_size (abfd));
	121	bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET);
	122	val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd);
	123	if (val != obj_som_stringtab_size (abfd))
	124	error ("Can't read in HP string table.");
	125
	126	/* We need to determine if objfile is a dynamic executable (so we
	127	can do the right thing for ST_ENTRY vs ST_CODE symbols).
	128
	129	There's nothing in the header which easily allows us to do
	130	this. The only reliable way I know of is to check for the
	131	existance of a $SHLIB_INFO$ section with a non-zero size. */
	132	shlib_info = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$");
	133	if (shlib_info)
	134	dynamic = (bfd_section_size (objfile->obfd, shlib_info) != 0);
	135	else
	136	dynamic = 0;
	137
	138	endbufp = buf + number_of_symbols;
	139	for (bufp = buf; bufp < endbufp; ++bufp)
	140	{
	141	enum minimal_symbol_type ms_type;
	142
	143	QUIT;
	144
	145	switch (bufp->symbol_scope)
	146	{
	147	case SS_UNIVERSAL:
	148	case SS_EXTERNAL:
	149	switch (bufp->symbol_type)
	150	{
	151	case ST_SYM_EXT:
	152	case ST_ARG_EXT:
	153	continue;
	154
	155	case ST_CODE:
	156	case ST_PRI_PROG:
	157	case ST_SEC_PROG:
	158	case ST_MILLICODE:
	159	symname = bufp->name.n_strx + stringtab;
	160	ms_type = mst_text;
bb140953	161	bufp->symbol_value += text_offset;
bfe2f12b JL	162	#ifdef SMASH_TEXT_ADDRESS
	163	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	164	#endif
	165	break;
	166
	167	case ST_ENTRY:
	168	symname = bufp->name.n_strx + stringtab;
	169	/* For a dynamic executable, ST_ENTRY symbols are
	170	the stubs, while the ST_CODE symbol is the real
	171	function. */
	172	if (dynamic)
	173	ms_type = mst_solib_trampoline;
	174	else
	175	ms_type = mst_text;
bb140953	176	bufp->symbol_value += text_offset;
bfe2f12b JL	177	#ifdef SMASH_TEXT_ADDRESS
	178	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	179	#endif
	180	break;
	181
	182	case ST_STUB:
	183	symname = bufp->name.n_strx + stringtab;
	184	ms_type = mst_solib_trampoline;
bb140953	185	bufp->symbol_value += text_offset;
bfe2f12b JL	186	#ifdef SMASH_TEXT_ADDRESS
	187	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	188	#endif
	189	break;
	190
	191	case ST_DATA:
	192	symname = bufp->name.n_strx + stringtab;
506af7a7	193	bufp->symbol_value += data_offset;
bfe2f12b JL	194	ms_type = mst_data;
	195	break;
	196	default:
	197	continue;
	198	}
	199	break;
	200
	201	#if 0
	202	/* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */
	203	case SS_GLOBAL:
	204	#endif
	205	case SS_LOCAL:
	206	switch (bufp->symbol_type)
	207	{
	208	case ST_SYM_EXT:
	209	case ST_ARG_EXT:
	210	continue;
	211
	212	case ST_CODE:
	213	symname = bufp->name.n_strx + stringtab;
	214	ms_type = mst_file_text;
bb140953	215	bufp->symbol_value += text_offset;
bfe2f12b JL	216	#ifdef SMASH_TEXT_ADDRESS
	217	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	218	#endif
	219
	220	check_strange_names:
	221	/* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local
	222	label prefixes for stabs, constant data, etc. So we need
	223	only filter out L$ symbols which are left in due to
	224	limitations in how GAS generates SOM relocations.
	225
	226	When linking in the HPUX C-library the HP linker has
	227	the nasty habit of placing section symbols from the literal
	228	subspaces in the middle of the program's text. Filter
	229	those out as best we can. Check for first and last character
	230	being '$'. */
	231	if ((symname[0] == 'L' && symname[1] == '$')
	232	\|\| (symname[0] == '$' && symname[strlen(symname) - 1] == '$'))
	233	continue;
	234	break;
	235
	236	case ST_PRI_PROG:
	237	case ST_SEC_PROG:
	238	case ST_MILLICODE:
	239	symname = bufp->name.n_strx + stringtab;
	240	ms_type = mst_file_text;
bb140953	241	bufp->symbol_value += text_offset;
bfe2f12b JL	242	#ifdef SMASH_TEXT_ADDRESS
	243	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	244	#endif
	245	break;
	246
	247	case ST_ENTRY:
	248	symname = bufp->name.n_strx + stringtab;
	249	/* For a dynamic executable, ST_ENTRY symbols are
	250	the stubs, while the ST_CODE symbol is the real
	251	function. */
	252	if (dynamic)
	253	ms_type = mst_solib_trampoline;
	254	else
	255	ms_type = mst_file_text;
bb140953	256	bufp->symbol_value += text_offset;
bfe2f12b JL	257	#ifdef SMASH_TEXT_ADDRESS
	258	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	259	#endif
	260	break;
	261
	262	case ST_STUB:
	263	symname = bufp->name.n_strx + stringtab;
	264	ms_type = mst_solib_trampoline;
bb140953	265	bufp->symbol_value += text_offset;
bfe2f12b JL	266	#ifdef SMASH_TEXT_ADDRESS
	267	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	268	#endif
	269	break;
	270
	271
	272	case ST_DATA:
	273	symname = bufp->name.n_strx + stringtab;
506af7a7	274	bufp->symbol_value += data_offset;
bfe2f12b JL	275	ms_type = mst_file_data;
	276	goto check_strange_names;
	277
	278	default:
	279	continue;
	280	}
	281	break;
	282
	283	default:
	284	continue;
	285	}
	286
	287	if (bufp->name.n_strx > obj_som_stringtab_size (abfd))
	288	error ("Invalid symbol data; bad HP string table offset: %d",
	289	bufp->name.n_strx);
	290
	291	record_minimal_symbol (symname,
	292	bufp->symbol_value, ms_type,
	293	objfile);
	294	}
bfe2f12b JL	295	}
	296
	297	/* Scan and build partial symbols for a symbol file.
	298	We have been initialized by a call to som_symfile_init, which
	299	currently does nothing.
	300
	301	SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
	302	in each section. This is ignored, as it isn't needed for SOM.
	303
	304	MAINLINE is true if we are reading the main symbol
	305	table (as opposed to a shared lib or dynamically loaded file).
	306
	307	This function only does the minimum work necessary for letting the
	308	user "name" things symbolically; it does not read the entire symtab.
	309	Instead, it reads the external and static symbols and puts them in partial
	310	symbol tables. When more extensive information is requested of a
	311	file, the corresponding partial symbol table is mutated into a full
	312	fledged symbol table by going back and reading the symbols
	313	for real.
	314
	315	We look for sections with specific names, to tell us what debug
	316	format to look for: FIXME!!!
	317
	318	somstab_build_psymtabs() handles STABS symbols.
	319
	320	Note that SOM files have a "minimal" symbol table, which is vaguely
	321	reminiscent of a COFF symbol table, but has only the minimal information
	322	necessary for linking. We process this also, and use the information to
	323	build gdb's minimal symbol table. This gives us some minimal debugging
	324	capability even for files compiled without -g. */
	325
	326	static void
	327	som_symfile_read (objfile, section_offsets, mainline)
	328	struct objfile *objfile;
	329	struct section_offsets *section_offsets;
	330	int mainline;
	331	{
	332	bfd *abfd = objfile->obfd;
	333	struct cleanup *back_to;
bfe2f12b JL	334
	335	init_minimal_symbol_collection ();
	336	back_to = make_cleanup (discard_minimal_symbols, 0);
	337
6a86fa48	338	/* Process the normal SOM symbol table first. */
bfe2f12b	339
bb140953	340	som_symtab_read (abfd, objfile, section_offsets);
bfe2f12b	341
98c0e047	342	/* Now read information from the stabs debug sections. */
6a86fa48 JL	343	stabsect_build_psymtabs (objfile, section_offsets, mainline,
6a86fa48 JL	344	"$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$");
bfe2f12b	345
98c0e047 JL	346	/* Now read the native debug information. */
98c0e047 JL	347	hpread_build_psymtabs (objfile, section_offsets, mainline);
98c0e047	348
6a86fa48 JL	349	/* Install any minimal symbols that have been collected as the current
	350	minimal symbols for this objfile. */
	351	install_minimal_symbols (objfile);
bfe2f12b	352
31b2518a	353	/* Force hppa-tdep.c to re-read the unwind descriptors. */
c676d827	354	objfile->obj_private = NULL;
6a86fa48	355	do_cleanups (back_to);
bfe2f12b JL	356	}
	357
	358	/* Initialize anything that needs initializing when a completely new symbol
	359	file is specified (not just adding some symbols from another file, e.g. a
	360	shared library).
	361
	362	We reinitialize buildsym, since we may be reading stabs from a SOM file. */
	363
	364	static void
	365	som_new_init (ignore)
	366	struct objfile *ignore;
	367	{
	368	stabsread_new_init ();
	369	buildsym_new_init ();
	370	}
	371
	372	/* Perform any local cleanups required when we are done with a particular
	373	objfile. I.E, we are in the process of discarding all symbol information
	374	for an objfile, freeing up all memory held for it, and unlinking the
	375	objfile struct from the global list of known objfiles. */
	376
	377	static void
	378	som_symfile_finish (objfile)
	379	struct objfile *objfile;
	380	{
	381	if (objfile -> sym_stab_info != NULL)
	382	{
	383	mfree (objfile -> md, objfile -> sym_stab_info);
	384	}
98c0e047	385	hpread_symfile_finish (objfile);
bfe2f12b JL	386	}
	387
	388	/* SOM specific initialization routine for reading symbols.
	389
6a86fa48	390	Nothing SOM specific left to do anymore. */
bfe2f12b	391	static void
98c0e047 JL	392	som_symfile_init (objfile)
98c0e047 JL	393	struct objfile *objfile;
bfe2f12b	394	{
98c0e047	395	hpread_symfile_init (objfile);
bfe2f12b JL	396	}
	397
	398	/* SOM specific parsing routine for section offsets.
	399
	400	Plain and simple for now. */
	401
	402	static struct section_offsets *
	403	som_symfile_offsets (objfile, addr)
	404	struct objfile *objfile;
	405	CORE_ADDR addr;
	406	{
	407	struct section_offsets *section_offsets;
	408	int i;
	409
	410	objfile->num_sections = SECT_OFF_MAX;
	411	section_offsets = (struct section_offsets *)
	412	obstack_alloc (&objfile -> psymbol_obstack,
	413	sizeof (struct section_offsets)
	414	+ sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
	415
506af7a7 JL	416	/* First see if we're a shared library. If so, get the section
	417	offsets from the library, else get them from addr. */
	418	if (!som_solib_section_offsets (objfile, section_offsets))
	419	{
	420	for (i = 0; i < SECT_OFF_MAX; i++)
	421	ANOFFSET (section_offsets, i) = addr;
	422	}
bfe2f12b JL	423
	424	return section_offsets;
	425	}
	426	\f
	427	/* Register that we are able to handle SOM object file formats. */
	428
	429	static struct sym_fns som_sym_fns =
	430	{
	431	bfd_target_som_flavour,
	432	som_new_init, /* sym_new_init: init anything gbl to entire symtab */
	433	som_symfile_init, /* sym_init: read initial info, setup for sym_read() */
	434	som_symfile_read, /* sym_read: read a symbol file into symtab */
	435	som_symfile_finish, /* sym_finish: finished with file, cleanup */
	436	som_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
	437	NULL /* next: pointer to next struct sym_fns */
	438	};
	439
	440	void
	441	_initialize_somread ()
	442	{
	443	add_symtab_fns (&som_sym_fns);
	444	}