binutils-gdb/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>

/* Size of n_value and n_strx fields in a stab symbol.  */
#define BYTES_IN_WORD 4

#if 0
#include "aout/aout64.h"
#endif

/* 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 *,  CORE_ADDR, struct objfile *));

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, 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
som_symtab_read (abfd, addr, objfile)
     bfd *abfd;
     CORE_ADDR addr;
     struct objfile *objfile;
{
  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);

  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;
#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;
#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;
#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;
#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;
#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;
#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;
#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;
  CORE_ADDR offset;

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

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

  offset = ANOFFSET (section_offsets, 0);

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

  som_symtab_read (abfd, offset, objfile);

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

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

  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);
    }
}

/* SOM specific initialization routine for reading symbols.

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

/* 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;
}

/* 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);
}