[binutils.git] / gdb / paread.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 "libbfd.h"
#include "libhppa.h"
#include <syms.h>
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "buildsym.h"
#include "gdb-stabs.h"
#include "complaints.h"
#include <string.h>
#include "demangle.h"
#include <sys/file.h>
#include "aout/aout64.h"

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

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

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

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

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

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

static void
pa_symtab_read PARAMS ((bfd *,  CORE_ADDR, struct objfile *));

static void
free_painfo PARAMS ((PTR));

static struct section_offsets *
pa_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);
}

/*

LOCAL FUNCTION

	pa_symtab_read -- read the symbol table of a PA file

SYNOPSIS

	void pa_symtab_read (bfd *abfd, CORE_ADDR addr,
			      struct objfile *objfile)

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
pa_symtab_read (abfd, addr, objfile)
     bfd *abfd;
     CORE_ADDR addr;
     struct objfile *objfile;
{
  unsigned int number_of_symbols;
  unsigned int i;
  int val;
  char *stringtab;
  struct symbol_dictionary_record *buf, *bufp;
  CONST int symsize = sizeof (struct symbol_dictionary_record);

  number_of_symbols = bfd_get_symcount (abfd);

  buf = alloca (symsize * number_of_symbols);
  bfd_seek (abfd, obj_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_stringtab_size (abfd));
  bfd_seek (abfd, obj_str_filepos (abfd), L_SET);
  val = bfd_read (stringtab, obj_stringtab_size (abfd), 1, abfd);
  if (val != obj_stringtab_size (abfd))
    error ("Can't read in HP string table.");
  
  for (i = 0, bufp = buf; i < number_of_symbols; i++, bufp++)
    {
      enum minimal_symbol_type ms_type;

      QUIT;

      if (bufp->symbol_scope != SS_UNIVERSAL)
	continue;

      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_ENTRY:
        case ST_MILLICODE:
          ms_type = mst_text;
          bufp->symbol_value &= ~0x3; /* clear out permission bits */
          break;
        case ST_DATA:
          ms_type = mst_data;
          break;
        default:
          continue;
        }

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

      record_minimal_symbol (bufp->name.n_strx + stringtab,
			     bufp->symbol_value, ms_type, 
			     objfile);
    }

  install_minimal_symbols (objfile);
}

/* Read in the backtrace information stored in the `$UNWIND_START$' section of
   the object file.  This info is used mainly by find_unwind_entry() to find
   out the stack frame size and frame pointer used by procedures.  We put
   everything on the psymbol obstack in the objfile so that it automatically
   gets freed when the objfile is destroyed.  */

static void
read_unwind_info (objfile)
     struct objfile *objfile;
{
  asection *unwind_sec;
  struct obj_unwind_info *ui;

  ui = obstack_alloc (&objfile->psymbol_obstack,
		      sizeof (struct obj_unwind_info));

  ui->table = NULL;
  ui->cache = NULL;
  ui->last = -1;

  unwind_sec = bfd_get_section_by_name (objfile->obfd,
					"$UNWIND_START$");
  if (unwind_sec)
    {
      int size;
      int i, *ip;

      size = bfd_section_size (objfile->obfd, unwind_sec);
      ui->table = obstack_alloc (&objfile->psymbol_obstack, size);
      ui->last = size / sizeof (struct unwind_table_entry) - 1;

      bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table,
				0, size);

      OBJ_UNWIND_INFO (objfile) = ui;
    }
}

/* Scan and build partial symbols for a symbol file.
   We have been initialized by a call to pa_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 the PA.

   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!!!

   pastab_build_psymtabs() handles STABS symbols.

   Note that PA 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
pa_symfile_read (objfile, section_offsets, mainline)
     struct objfile *objfile;
     struct section_offsets *section_offsets;
     int mainline;
{
  bfd *abfd = objfile->obfd;
  struct cleanup *back_to;
  CORE_ADDR offset;

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

  make_cleanup (free_painfo, (PTR) objfile);

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

  /* FIXME, should take a section_offsets param, not just an offset.  */

  offset = ANOFFSET (section_offsets, 0);
  pa_symtab_read (abfd, offset, objfile);

  /* Now process debugging information, which is contained in
     special PA sections.  */

  pastab_build_psymtabs (objfile, section_offsets, mainline);

  read_unwind_info(objfile);

  do_cleanups (back_to);
}

/* This cleans up the objfile's sym_private pointer, and the chain of
   stab_section_info's, that might be dangling from it.  */

static void
free_painfo (objp)
     PTR objp;
{
  struct objfile *objfile = (struct objfile *)objp;
  struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
				     objfile->sym_private;
  struct stab_section_info *ssi, *nssi;

  ssi = dbxinfo->stab_section_info;
  while (ssi)
    {
      nssi = ssi->next;
      mfree (objfile->md, ssi);
      ssi = nssi;
    }

  dbxinfo->stab_section_info = 0;	/* Just say No mo info about this.  */
}

/* 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 PA file.  */

static void
pa_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
pa_symfile_finish (objfile)
     struct objfile *objfile;
{
  if (objfile -> sym_private != NULL)
    {
      mfree (objfile -> md, objfile -> sym_private);
    }
}

/* PA specific initialization routine for reading symbols.

   It is passed a pointer to a struct sym_fns which contains, among other
   things, the BFD for the file whose symbols are being read, and a slot for
   a pointer to "private data" which we can fill with goodies.

   This routine is almost a complete ripoff of dbx_symfile_init.  The
   common parts of these routines should be extracted and used instead of
   duplicating this code.  FIXME. */

static void
pa_symfile_init (objfile)
     struct objfile *objfile;
{
  int val;
  bfd *sym_bfd = objfile->obfd;
  char *name = bfd_get_filename (sym_bfd);
  asection *stabsect;		/* Section containing symbol table entries */
  asection *stringsect;		/* Section containing symbol name strings */

  stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$");
  stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$");

  /* Allocate struct to keep track of the symfile */
  objfile->sym_private = (PTR)
    xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));

  memset ((PTR) objfile->sym_private, 0, sizeof (struct dbx_symfile_info));

  if (!stabsect)
    return;

  if (!stringsect)
    error ("Found stabs, but not string section");

  /* FIXME POKING INSIDE BFD DATA STRUCTURES */
#define	STRING_TABLE_OFFSET	(stringsect->filepos)
#define	SYMBOL_TABLE_OFFSET	(stabsect->filepos)

  /* FIXME POKING INSIDE BFD DATA STRUCTURES */

  DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
  DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
  if (!DBX_TEXT_SECT (objfile))
    error ("Can't find .text section in symbol file");

  DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist);
  DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
    / DBX_SYMBOL_SIZE (objfile);
  DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;

  /* Read the string table and stash it away in the psymbol_obstack.  It is
     only needed as long as we need to expand psymbols into full symbols,
     so when we blow away the psymbol the string table goes away as well.
     Note that gdb used to use the results of attempting to malloc the
     string table, based on the size it read, as a form of sanity check
     for botched byte swapping, on the theory that a byte swapped string
     table size would be so totally bogus that the malloc would fail.  Now
     that we put in on the psymbol_obstack, we can't do this since gdb gets
     a fatal error (out of virtual memory) if the size is bogus.  We can
     however at least check to see if the size is zero or some negative
     value. */

  DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect);

  if (DBX_SYMCOUNT (objfile) == 0
      || DBX_STRINGTAB_SIZE (objfile) == 0)
    return;

  if (DBX_STRINGTAB_SIZE (objfile) <= 0
      || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
    error ("ridiculous string table size (%d bytes).",
	   DBX_STRINGTAB_SIZE (objfile));

  DBX_STRINGTAB (objfile) =
    (char *) obstack_alloc (&objfile -> psymbol_obstack,
			    DBX_STRINGTAB_SIZE (objfile));

  /* Now read in the string table in one big gulp.  */

  val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
  if (val < 0)
    perror_with_name (name);
  val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
		  sym_bfd);
  if (val != DBX_STRINGTAB_SIZE (objfile))
    perror_with_name (name);
}

/* PA specific parsing routine for section offsets.

   Plain and simple for now.  */

static struct section_offsets *
pa_symfile_offsets (objfile, addr)
     struct objfile *objfile;
     CORE_ADDR addr;
{
  struct section_offsets *section_offsets;
  int i;
 
  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 PA object file formats. */

/* This is probably a mistake.  FIXME.  Why can't the HP's use an ordinary
   file format name with an -hppa suffix?  */
static struct sym_fns pa_sym_fns =
{
  "hppa",		/* sym_name: name or name prefix of BFD target type */
  4,			/* sym_namelen: number of significant sym_name chars */
  pa_new_init,		/* sym_new_init: init anything gbl to entire symtab */
  pa_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
  pa_symfile_read,	/* sym_read: read a symbol file into symtab */
  pa_symfile_finish,	/* sym_finish: finished with file, cleanup */
  pa_symfile_offsets,	/* sym_offsets:  Translate ext. to int. relocation */
  NULL			/* next: pointer to next struct sym_fns */
};

void
_initialize_paread ()
{
  add_symtab_fns (&pa_sym_fns);
}
Commit	Line	Data
684a832f SG	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
684a832f SG	21	#include "defs.h"
	22	#include "bfd.h"
	23	#include "libbfd.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 "gdb-stabs.h"
	31	#include "complaints.h"
	32	#include <string.h>
	33	#include "demangle.h"
	34	#include <sys/file.h>
0213d96f	35	#include "aout/aout64.h"
684a832f SG	36
	37	/* Various things we might complain about... */
	38
	39	static void
	40	pa_symfile_init PARAMS ((struct objfile *));
	41
	42	static void
	43	pa_new_init PARAMS ((struct objfile *));
	44
fa9265e5 SG	45	static void
	46	read_unwind_info PARAMS ((struct objfile *));
	47
684a832f SG	48	static void
	49	pa_symfile_read PARAMS ((struct objfile , struct section_offsets , int));
	50
	51	static void
	52	pa_symfile_finish PARAMS ((struct objfile *));
	53
	54	static void
	55	pa_symtab_read PARAMS ((bfd , CORE_ADDR, struct objfile ));
	56
	57	static void
	58	free_painfo PARAMS ((PTR));
	59
	60	static struct section_offsets *
	61	pa_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
	62
	63	static void
	64	record_minimal_symbol PARAMS ((char *, CORE_ADDR,
	65	enum minimal_symbol_type,
	66	struct objfile *));
	67
	68	static void
	69	record_minimal_symbol (name, address, ms_type, objfile)
	70	char *name;
	71	CORE_ADDR address;
	72	enum minimal_symbol_type ms_type;
	73	struct objfile *objfile;
	74	{
	75	name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
	76	prim_record_minimal_symbol (name, address, ms_type);
	77	}
	78
	79	/*
	80
	81	LOCAL FUNCTION
	82
	83	pa_symtab_read -- read the symbol table of a PA file
	84
	85	SYNOPSIS
	86
	87	void pa_symtab_read (bfd *abfd, CORE_ADDR addr,
	88	struct objfile *objfile)
	89
	90	DESCRIPTION
	91
	92	Given an open bfd, a base address to relocate symbols to, and a
	93	flag that specifies whether or not this bfd is for an executable
	94	or not (may be shared library for example), add all the global
	95	function and data symbols to the minimal symbol table.
	96	*/
	97
	98	static void
	99	pa_symtab_read (abfd, addr, objfile)
	100	bfd *abfd;
	101	CORE_ADDR addr;
	102	struct objfile *objfile;
	103	{
	104	unsigned int number_of_symbols;
	105	unsigned int i;
	106	int val;
	107	char *stringtab;
	108	struct symbol_dictionary_record buf, bufp;
0213d96f	109	CONST int symsize = sizeof (struct symbol_dictionary_record);
684a832f	110
0213d96f	111	number_of_symbols = bfd_get_symcount (abfd);
684a832f	112
0213d96f SG	113	buf = alloca (symsize * number_of_symbols);
	114	bfd_seek (abfd, obj_sym_filepos (abfd), L_SET);
	115	val = bfd_read (buf, symsize * number_of_symbols, 1, abfd);
	116	if (val != symsize * number_of_symbols)
684a832f SG	117	error ("Couldn't read symbol dictionary!");
684a832f SG	118
0213d96f SG	119	stringtab = alloca (obj_stringtab_size (abfd));
	120	bfd_seek (abfd, obj_str_filepos (abfd), L_SET);
	121	val = bfd_read (stringtab, obj_stringtab_size (abfd), 1, abfd);
	122	if (val != obj_stringtab_size (abfd))
684a832f SG	123	error ("Can't read in HP string table.");
	124
	125	for (i = 0, bufp = buf; i < number_of_symbols; i++, bufp++)
	126	{
	127	enum minimal_symbol_type ms_type;
	128
	129	QUIT;
	130
	131	if (bufp->symbol_scope != SS_UNIVERSAL)
	132	continue;
	133
	134	switch (bufp->symbol_type)
	135	{
	136	case ST_SYM_EXT:
	137	case ST_ARG_EXT:
	138	continue;
	139	case ST_CODE:
	140	case ST_PRI_PROG:
	141	case ST_SEC_PROG:
	142	case ST_ENTRY:
	143	case ST_MILLICODE:
	144	ms_type = mst_text;
	145	bufp->symbol_value &= ~0x3; /* clear out permission bits */
	146	break;
	147	case ST_DATA:
	148	ms_type = mst_data;
	149	break;
	150	default:
	151	continue;
	152	}
	153
0213d96f	154	if (bufp->name.n_strx > obj_stringtab_size (abfd))
684a832f SG	155	error ("Invalid symbol data; bad HP string table offset: %d",
	156	bufp->name.n_strx);
	157
	158	record_minimal_symbol (bufp->name.n_strx + stringtab,
	159	bufp->symbol_value, ms_type,
	160	objfile);
	161	}
	162
	163	install_minimal_symbols (objfile);
	164	}
	165
fa9265e5 SG	166	/* Read in the backtrace information stored in the `$UNWIND_START$' section of
	167	the object file. This info is used mainly by find_unwind_entry() to find
	168	out the stack frame size and frame pointer used by procedures. We put
	169	everything on the psymbol obstack in the objfile so that it automatically
	170	gets freed when the objfile is destroyed. */
	171
	172	static void
	173	read_unwind_info (objfile)
	174	struct objfile *objfile;
	175	{
	176	asection *unwind_sec;
	177	struct obj_unwind_info *ui;
	178
	179	ui = obstack_alloc (&objfile->psymbol_obstack,
	180	sizeof (struct obj_unwind_info));
	181
	182	ui->table = NULL;
	183	ui->cache = NULL;
	184	ui->last = -1;
	185
	186	unwind_sec = bfd_get_section_by_name (objfile->obfd,
	187	"$UNWIND_START$");
	188	if (unwind_sec)
	189	{
	190	int size;
	191	int i, *ip;
	192
	193	size = bfd_section_size (objfile->obfd, unwind_sec);
	194	ui->table = obstack_alloc (&objfile->psymbol_obstack, size);
	195	ui->last = size / sizeof (struct unwind_table_entry) - 1;
	196
	197	bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table,
	198	0, size);
	199
	200	OBJ_UNWIND_INFO (objfile) = ui;
	201	}
	202	}
	203
684a832f SG	204	/* Scan and build partial symbols for a symbol file.
	205	We have been initialized by a call to pa_symfile_init, which
	206	currently does nothing.
	207
	208	SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
	209	in each section. This is ignored, as it isn't needed for the PA.
	210
	211	MAINLINE is true if we are reading the main symbol
	212	table (as opposed to a shared lib or dynamically loaded file).
	213
	214	This function only does the minimum work necessary for letting the
	215	user "name" things symbolically; it does not read the entire symtab.
	216	Instead, it reads the external and static symbols and puts them in partial
	217	symbol tables. When more extensive information is requested of a
	218	file, the corresponding partial symbol table is mutated into a full
	219	fledged symbol table by going back and reading the symbols
	220	for real.
	221
	222	We look for sections with specific names, to tell us what debug
	223	format to look for: FIXME!!!
	224
	225	pastab_build_psymtabs() handles STABS symbols.
	226
	227	Note that PA files have a "minimal" symbol table, which is vaguely
	228	reminiscent of a COFF symbol table, but has only the minimal information
	229	necessary for linking. We process this also, and use the information to
	230	build gdb's minimal symbol table. This gives us some minimal debugging
	231	capability even for files compiled without -g. */
	232
	233	static void
	234	pa_symfile_read (objfile, section_offsets, mainline)
	235	struct objfile *objfile;
	236	struct section_offsets *section_offsets;
	237	int mainline;
	238	{
	239	bfd *abfd = objfile->obfd;
	240	struct cleanup *back_to;
	241	CORE_ADDR offset;
	242
	243	init_minimal_symbol_collection ();
	244	back_to = make_cleanup (discard_minimal_symbols, 0);
	245
	246	make_cleanup (free_painfo, (PTR) objfile);
	247
	248	/* Process the normal PA symbol table first. */
	249
	250	/* FIXME, should take a section_offsets param, not just an offset. */
	251
	252	offset = ANOFFSET (section_offsets, 0);
	253	pa_symtab_read (abfd, offset, objfile);
	254
	255	/* Now process debugging information, which is contained in
	256	special PA sections. */
	257
	258	pastab_build_psymtabs (objfile, section_offsets, mainline);
	259
fa9265e5 SG	260	read_unwind_info(objfile);
fa9265e5 SG	261
684a832f SG	262	do_cleanups (back_to);
	263	}
	264
	265	/* This cleans up the objfile's sym_private pointer, and the chain of
	266	stab_section_info's, that might be dangling from it. */
	267
	268	static void
	269	free_painfo (objp)
	270	PTR objp;
	271	{
	272	struct objfile objfile = (struct objfile )objp;
	273	struct dbx_symfile_info dbxinfo = (struct dbx_symfile_info )
	274	objfile->sym_private;
	275	struct stab_section_info ssi, nssi;
	276
	277	ssi = dbxinfo->stab_section_info;
	278	while (ssi)
	279	{
	280	nssi = ssi->next;
	281	mfree (objfile->md, ssi);
	282	ssi = nssi;
	283	}
	284
	285	dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
	286	}
	287
	288	/* Initialize anything that needs initializing when a completely new symbol
	289	file is specified (not just adding some symbols from another file, e.g. a
	290	shared library).
	291
	292	We reinitialize buildsym, since we may be reading stabs from a PA file. */
	293
	294	static void
	295	pa_new_init (ignore)
	296	struct objfile *ignore;
	297	{
	298	stabsread_new_init ();
	299	buildsym_new_init ();
	300	}
	301
	302	/* Perform any local cleanups required when we are done with a particular
	303	objfile. I.E, we are in the process of discarding all symbol information
	304	for an objfile, freeing up all memory held for it, and unlinking the
	305	objfile struct from the global list of known objfiles. */
	306
	307	static void
	308	pa_symfile_finish (objfile)
	309	struct objfile *objfile;
	310	{
	311	if (objfile -> sym_private != NULL)
	312	{
	313	mfree (objfile -> md, objfile -> sym_private);
	314	}
	315	}
	316
684a832f SG	317	/* PA specific initialization routine for reading symbols.
	318
	319	It is passed a pointer to a struct sym_fns which contains, among other
	320	things, the BFD for the file whose symbols are being read, and a slot for
	321	a pointer to "private data" which we can fill with goodies.
	322
	323	This routine is almost a complete ripoff of dbx_symfile_init. The
	324	common parts of these routines should be extracted and used instead of
	325	duplicating this code. FIXME. */
	326
	327	static void
	328	pa_symfile_init (objfile)
	329	struct objfile *objfile;
	330	{
	331	int val;
	332	bfd *sym_bfd = objfile->obfd;
	333	char *name = bfd_get_filename (sym_bfd);
0213d96f SG	334	asection stabsect; / Section containing symbol table entries */
	335	asection stringsect; / Section containing symbol name strings */
	336
	337	stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$");
	338	stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$");
684a832f SG	339
	340	/* Allocate struct to keep track of the symfile */
	341	objfile->sym_private = (PTR)
	342	xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
	343
0213d96f SG	344	memset ((PTR) objfile->sym_private, 0, sizeof (struct dbx_symfile_info));
	345
	346	if (!stabsect)
	347	return;
	348
	349	if (!stringsect)
	350	error ("Found stabs, but not string section");
	351
684a832f	352	/* FIXME POKING INSIDE BFD DATA STRUCTURES */
0213d96f SG	353	#define STRING_TABLE_OFFSET (stringsect->filepos)
0213d96f SG	354	#define SYMBOL_TABLE_OFFSET (stabsect->filepos)
684a832f SG	355
	356	/* FIXME POKING INSIDE BFD DATA STRUCTURES */
	357
	358	DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
	359	DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text");
	360	if (!DBX_TEXT_SECT (objfile))
	361	error ("Can't find .text section in symbol file");
	362
0213d96f SG	363	DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist);
	364	DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
	365	/ DBX_SYMBOL_SIZE (objfile);
684a832f SG	366	DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
	367
	368	/* Read the string table and stash it away in the psymbol_obstack. It is
	369	only needed as long as we need to expand psymbols into full symbols,
	370	so when we blow away the psymbol the string table goes away as well.
	371	Note that gdb used to use the results of attempting to malloc the
	372	string table, based on the size it read, as a form of sanity check
	373	for botched byte swapping, on the theory that a byte swapped string
	374	table size would be so totally bogus that the malloc would fail. Now
	375	that we put in on the psymbol_obstack, we can't do this since gdb gets
	376	a fatal error (out of virtual memory) if the size is bogus. We can
	377	however at least check to see if the size is zero or some negative
	378	value. */
	379
0213d96f	380	DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect);
684a832f SG	381
	382	if (DBX_SYMCOUNT (objfile) == 0
	383	\|\| DBX_STRINGTAB_SIZE (objfile) == 0)
	384	return;
	385
	386	if (DBX_STRINGTAB_SIZE (objfile) <= 0
	387	\|\| DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
	388	error ("ridiculous string table size (%d bytes).",
	389	DBX_STRINGTAB_SIZE (objfile));
	390
	391	DBX_STRINGTAB (objfile) =
	392	(char *) obstack_alloc (&objfile -> psymbol_obstack,
	393	DBX_STRINGTAB_SIZE (objfile));
	394
	395	/* Now read in the string table in one big gulp. */
	396
	397	val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
	398	if (val < 0)
	399	perror_with_name (name);
	400	val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
	401	sym_bfd);
	402	if (val != DBX_STRINGTAB_SIZE (objfile))
	403	perror_with_name (name);
	404	}
	405
	406	/* PA specific parsing routine for section offsets.
	407
	408	Plain and simple for now. */
	409
	410	static struct section_offsets *
	411	pa_symfile_offsets (objfile, addr)
	412	struct objfile *objfile;
	413	CORE_ADDR addr;
	414	{
	415	struct section_offsets *section_offsets;
	416	int i;
	417
	418	section_offsets = (struct section_offsets *)
	419	obstack_alloc (&objfile -> psymbol_obstack,
	420	sizeof (struct section_offsets) +
	421	sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
	422
	423	for (i = 0; i < SECT_OFF_MAX; i++)
	424	ANOFFSET (section_offsets, i) = addr;
	425
	426	return section_offsets;
	427	}
	428	\f
	429	/* Register that we are able to handle PA object file formats. */
	430
	431	/* This is probably a mistake. FIXME. Why can't the HP's use an ordinary
	432	file format name with an -hppa suffix? */
	433	static struct sym_fns pa_sym_fns =
	434	{
	435	"hppa", /* sym_name: name or name prefix of BFD target type */
	436	4, /* sym_namelen: number of significant sym_name chars */
	437	pa_new_init, /* sym_new_init: init anything gbl to entire symtab */
	438	pa_symfile_init, /* sym_init: read initial info, setup for sym_read() */
	439	pa_symfile_read, /* sym_read: read a symbol file into symtab */
	440	pa_symfile_finish, /* sym_finish: finished with file, cleanup */
	441	pa_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
	442	NULL /* next: pointer to next struct sym_fns */
	443	};
	444
445	void
446	_initialize_paread ()
447	{
448	add_symtab_fns (&pa_sym_fns);
449	}