[binutils.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;


  /* FIXME.  Data stuff needs dynamic relocation too!  */
  text_offset = ANOFFSET (section_offsets, 0);

  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;
	      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;
	      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));

  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);
bb140953 JL	106	CORE_ADDR text_offset;
	107
	108
	109	/* FIXME. Data stuff needs dynamic relocation too! */
	110	text_offset = ANOFFSET (section_offsets, 0);
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;
	193	ms_type = mst_data;
	194	break;
	195	default:
	196	continue;
	197	}
	198	break;
	199
	200	#if 0
	201	/* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */
	202	case SS_GLOBAL:
	203	#endif
	204	case SS_LOCAL:
	205	switch (bufp->symbol_type)
	206	{
	207	case ST_SYM_EXT:
	208	case ST_ARG_EXT:
	209	continue;
	210
	211	case ST_CODE:
	212	symname = bufp->name.n_strx + stringtab;
	213	ms_type = mst_file_text;
bb140953	214	bufp->symbol_value += text_offset;
bfe2f12b JL	215	#ifdef SMASH_TEXT_ADDRESS
	216	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	217	#endif
	218
	219	check_strange_names:
	220	/* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local
	221	label prefixes for stabs, constant data, etc. So we need
	222	only filter out L$ symbols which are left in due to
	223	limitations in how GAS generates SOM relocations.
	224
	225	When linking in the HPUX C-library the HP linker has
	226	the nasty habit of placing section symbols from the literal
	227	subspaces in the middle of the program's text. Filter
	228	those out as best we can. Check for first and last character
	229	being '$'. */
	230	if ((symname[0] == 'L' && symname[1] == '$')
	231	\|\| (symname[0] == '$' && symname[strlen(symname) - 1] == '$'))
	232	continue;
	233	break;
	234
	235	case ST_PRI_PROG:
	236	case ST_SEC_PROG:
	237	case ST_MILLICODE:
	238	symname = bufp->name.n_strx + stringtab;
	239	ms_type = mst_file_text;
bb140953	240	bufp->symbol_value += text_offset;
bfe2f12b JL	241	#ifdef SMASH_TEXT_ADDRESS
	242	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	243	#endif
	244	break;
	245
	246	case ST_ENTRY:
	247	symname = bufp->name.n_strx + stringtab;
	248	/* For a dynamic executable, ST_ENTRY symbols are
	249	the stubs, while the ST_CODE symbol is the real
	250	function. */
	251	if (dynamic)
	252	ms_type = mst_solib_trampoline;
	253	else
	254	ms_type = mst_file_text;
bb140953	255	bufp->symbol_value += text_offset;
bfe2f12b JL	256	#ifdef SMASH_TEXT_ADDRESS
	257	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	258	#endif
	259	break;
	260
	261	case ST_STUB:
	262	symname = bufp->name.n_strx + stringtab;
	263	ms_type = mst_solib_trampoline;
bb140953	264	bufp->symbol_value += text_offset;
bfe2f12b JL	265	#ifdef SMASH_TEXT_ADDRESS
	266	SMASH_TEXT_ADDRESS (bufp->symbol_value);
	267	#endif
	268	break;
	269
	270
	271	case ST_DATA:
	272	symname = bufp->name.n_strx + stringtab;
	273	ms_type = mst_file_data;
	274	goto check_strange_names;
	275
	276	default:
	277	continue;
	278	}
	279	break;
	280
	281	default:
	282	continue;
	283	}
	284
	285	if (bufp->name.n_strx > obj_som_stringtab_size (abfd))
	286	error ("Invalid symbol data; bad HP string table offset: %d",
	287	bufp->name.n_strx);
	288
	289	record_minimal_symbol (symname,
	290	bufp->symbol_value, ms_type,
	291	objfile);
	292	}
bfe2f12b JL	293	}
	294
	295	/* Scan and build partial symbols for a symbol file.
	296	We have been initialized by a call to som_symfile_init, which
	297	currently does nothing.
	298
	299	SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
	300	in each section. This is ignored, as it isn't needed for SOM.
	301
	302	MAINLINE is true if we are reading the main symbol
	303	table (as opposed to a shared lib or dynamically loaded file).
	304
	305	This function only does the minimum work necessary for letting the
	306	user "name" things symbolically; it does not read the entire symtab.
	307	Instead, it reads the external and static symbols and puts them in partial
	308	symbol tables. When more extensive information is requested of a
	309	file, the corresponding partial symbol table is mutated into a full
	310	fledged symbol table by going back and reading the symbols
	311	for real.
	312
	313	We look for sections with specific names, to tell us what debug
	314	format to look for: FIXME!!!
	315
	316	somstab_build_psymtabs() handles STABS symbols.
	317
	318	Note that SOM files have a "minimal" symbol table, which is vaguely
	319	reminiscent of a COFF symbol table, but has only the minimal information
	320	necessary for linking. We process this also, and use the information to
	321	build gdb's minimal symbol table. This gives us some minimal debugging
	322	capability even for files compiled without -g. */
	323
	324	static void
	325	som_symfile_read (objfile, section_offsets, mainline)
	326	struct objfile *objfile;
	327	struct section_offsets *section_offsets;
	328	int mainline;
	329	{
	330	bfd *abfd = objfile->obfd;
	331	struct cleanup *back_to;
bfe2f12b JL	332
	333	init_minimal_symbol_collection ();
	334	back_to = make_cleanup (discard_minimal_symbols, 0);
	335
6a86fa48	336	/* Process the normal SOM symbol table first. */
bfe2f12b	337
bb140953	338	som_symtab_read (abfd, objfile, section_offsets);
bfe2f12b	339
98c0e047	340	/* Now read information from the stabs debug sections. */
6a86fa48 JL	341	stabsect_build_psymtabs (objfile, section_offsets, mainline,
6a86fa48 JL	342	"$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$");
bfe2f12b	343
98c0e047 JL	344	/* Now read the native debug information. */
98c0e047 JL	345	hpread_build_psymtabs (objfile, section_offsets, mainline);
98c0e047	346
6a86fa48 JL	347	/* Install any minimal symbols that have been collected as the current
	348	minimal symbols for this objfile. */
	349	install_minimal_symbols (objfile);
bfe2f12b	350
31b2518a	351	/* Force hppa-tdep.c to re-read the unwind descriptors. */
c676d827	352	objfile->obj_private = NULL;
6a86fa48	353	do_cleanups (back_to);
bfe2f12b JL	354	}
	355
	356	/* Initialize anything that needs initializing when a completely new symbol
	357	file is specified (not just adding some symbols from another file, e.g. a
	358	shared library).
	359
	360	We reinitialize buildsym, since we may be reading stabs from a SOM file. */
	361
	362	static void
	363	som_new_init (ignore)
	364	struct objfile *ignore;
	365	{
	366	stabsread_new_init ();
	367	buildsym_new_init ();
	368	}
	369
	370	/* Perform any local cleanups required when we are done with a particular
	371	objfile. I.E, we are in the process of discarding all symbol information
	372	for an objfile, freeing up all memory held for it, and unlinking the
	373	objfile struct from the global list of known objfiles. */
	374
	375	static void
	376	som_symfile_finish (objfile)
	377	struct objfile *objfile;
	378	{
	379	if (objfile -> sym_stab_info != NULL)
	380	{
	381	mfree (objfile -> md, objfile -> sym_stab_info);
	382	}
98c0e047	383	hpread_symfile_finish (objfile);
bfe2f12b JL	384	}
	385
	386	/* SOM specific initialization routine for reading symbols.
	387
6a86fa48	388	Nothing SOM specific left to do anymore. */
bfe2f12b	389	static void
98c0e047 JL	390	som_symfile_init (objfile)
98c0e047 JL	391	struct objfile *objfile;
bfe2f12b	392	{
98c0e047	393	hpread_symfile_init (objfile);
bfe2f12b JL	394	}
	395
	396	/* SOM specific parsing routine for section offsets.
	397
	398	Plain and simple for now. */
	399
	400	static struct section_offsets *
	401	som_symfile_offsets (objfile, addr)
	402	struct objfile *objfile;
	403	CORE_ADDR addr;
	404	{
	405	struct section_offsets *section_offsets;
	406	int i;
	407
	408	objfile->num_sections = SECT_OFF_MAX;
	409	section_offsets = (struct section_offsets *)
	410	obstack_alloc (&objfile -> psymbol_obstack,
	411	sizeof (struct section_offsets)
	412	+ sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
	413
	414	for (i = 0; i < SECT_OFF_MAX; i++)
	415	ANOFFSET (section_offsets, i) = addr;
	416
	417	return section_offsets;
	418	}
	419	\f
	420	/* Register that we are able to handle SOM object file formats. */
	421
	422	static struct sym_fns som_sym_fns =
	423	{
	424	bfd_target_som_flavour,
	425	som_new_init, /* sym_new_init: init anything gbl to entire symtab */
	426	som_symfile_init, /* sym_init: read initial info, setup for sym_read() */
	427	som_symfile_read, /* sym_read: read a symbol file into symtab */
	428	som_symfile_finish, /* sym_finish: finished with file, cleanup */
	429	som_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
	430	NULL /* next: pointer to next struct sym_fns */
	431	};
	432
	433	void
	434	_initialize_somread ()
	435	{
	436	add_symtab_fns (&som_sym_fns);
	437	}