526 lines
16 KiB
C
526 lines
16 KiB
C
/* Read HP PA/Risc object files for GDB.
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Copyright 1991, 1992 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "bfd.h"
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#include <time.h> /* For time_t in libbfd.h. */
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#include <sys/types.h> /* For time_t, if not in time.h. */
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#include "libbfd.h"
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#include "som.h"
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#include "libhppa.h"
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#include <syms.h>
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "buildsym.h"
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#include "stabsread.h"
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#include "gdb-stabs.h"
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#include "complaints.h"
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#include <string.h>
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#include "demangle.h"
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#include <sys/file.h>
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/* Size of n_value and n_strx fields in a stab symbol. */
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#define BYTES_IN_WORD 4
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#include "aout/aout64.h"
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/* Various things we might complain about... */
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static void
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pa_symfile_init PARAMS ((struct objfile *));
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static void
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pa_new_init PARAMS ((struct objfile *));
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static void
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read_unwind_info PARAMS ((struct objfile *));
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static void
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pa_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
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static void
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pa_symfile_finish PARAMS ((struct objfile *));
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static void
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pa_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
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static void
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free_painfo PARAMS ((PTR));
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static struct section_offsets *
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pa_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
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static void
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record_minimal_symbol PARAMS ((char *, CORE_ADDR,
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enum minimal_symbol_type,
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struct objfile *));
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static void
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record_minimal_symbol (name, address, ms_type, objfile)
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char *name;
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CORE_ADDR address;
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enum minimal_symbol_type ms_type;
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struct objfile *objfile;
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{
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name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
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prim_record_minimal_symbol (name, address, ms_type);
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}
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/*
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LOCAL FUNCTION
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pa_symtab_read -- read the symbol table of a PA file
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SYNOPSIS
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void pa_symtab_read (bfd *abfd, CORE_ADDR addr,
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struct objfile *objfile)
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DESCRIPTION
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Given an open bfd, a base address to relocate symbols to, and a
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flag that specifies whether or not this bfd is for an executable
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or not (may be shared library for example), add all the global
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function and data symbols to the minimal symbol table.
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*/
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static void
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pa_symtab_read (abfd, addr, objfile)
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bfd *abfd;
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CORE_ADDR addr;
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struct objfile *objfile;
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{
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unsigned int number_of_symbols;
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unsigned int i;
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int val;
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char *stringtab;
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struct symbol_dictionary_record *buf, *bufp, *endbufp;
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char *symname;
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CONST int symsize = sizeof (struct symbol_dictionary_record);
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number_of_symbols = bfd_get_symcount (abfd);
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buf = alloca (symsize * number_of_symbols);
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bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET);
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val = bfd_read (buf, symsize * number_of_symbols, 1, abfd);
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if (val != symsize * number_of_symbols)
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error ("Couldn't read symbol dictionary!");
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stringtab = alloca (obj_som_stringtab_size (abfd));
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bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET);
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val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd);
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if (val != obj_som_stringtab_size (abfd))
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error ("Can't read in HP string table.");
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endbufp = buf + number_of_symbols;
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for (bufp = buf; bufp < endbufp; ++bufp)
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{
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enum minimal_symbol_type ms_type;
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QUIT;
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switch (bufp->symbol_scope)
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{
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case SS_UNIVERSAL:
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switch (bufp->symbol_type)
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{
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case ST_SYM_EXT:
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case ST_ARG_EXT:
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continue;
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case ST_CODE:
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case ST_PRI_PROG:
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case ST_SEC_PROG:
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case ST_ENTRY:
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case ST_MILLICODE:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_text;
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bufp->symbol_value &= ~0x3; /* clear out permission bits */
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break;
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case ST_DATA:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_data;
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break;
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default:
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continue;
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}
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break;
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#if 0
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/* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */
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case SS_GLOBAL:
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#endif
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case SS_LOCAL:
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switch (bufp->symbol_type)
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{
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case ST_SYM_EXT:
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case ST_ARG_EXT:
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continue;
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case ST_CODE:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_file_text;
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bufp->symbol_value &= ~0x3; /* clear out permission bits */
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check_strange_names:
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/* GAS leaves labels in .o files after assembling. At
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least labels starting with "LS$", "LBB$", "LBE$",
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"LC$", and "L$" can happen. This should be fixed in
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the assembler and/or compiler, to save space in the
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executable (and because having GDB make gross
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distinctions based on the name is kind of ugly), but
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until then, just ignore them. ("L$" at least, has something
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to do with getting relocation correct, so that one might
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be hard to fix). */
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if (*symname == 'L'
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&& (symname[1] == '$' || symname[2] == '$'
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|| symname[3] == '$'))
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continue;
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break;
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case ST_PRI_PROG:
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case ST_SEC_PROG:
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case ST_ENTRY:
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case ST_MILLICODE:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_file_text;
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bufp->symbol_value &= ~0x3; /* clear out permission bits */
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break;
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case ST_DATA:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_file_data;
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goto check_strange_names;
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default:
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continue;
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}
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break;
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default:
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continue;
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}
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if (bufp->name.n_strx > obj_som_stringtab_size (abfd))
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error ("Invalid symbol data; bad HP string table offset: %d",
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bufp->name.n_strx);
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record_minimal_symbol (symname,
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bufp->symbol_value, ms_type,
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objfile);
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}
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install_minimal_symbols (objfile);
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}
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/* Read in the backtrace information stored in the `$UNWIND_START$' section of
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the object file. This info is used mainly by find_unwind_entry() to find
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out the stack frame size and frame pointer used by procedures. We put
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everything on the psymbol obstack in the objfile so that it automatically
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gets freed when the objfile is destroyed. */
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static void
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read_unwind_info (objfile)
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struct objfile *objfile;
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{
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asection *unwind_sec;
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struct obj_unwind_info *ui;
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ui = obstack_alloc (&objfile->psymbol_obstack,
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sizeof (struct obj_unwind_info));
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ui->table = NULL;
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ui->cache = NULL;
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ui->last = -1;
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unwind_sec = bfd_get_section_by_name (objfile->obfd,
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"$UNWIND_START$");
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if (unwind_sec)
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{
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int size;
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int i, *ip;
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size = bfd_section_size (objfile->obfd, unwind_sec);
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ui->table = obstack_alloc (&objfile->psymbol_obstack, size);
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ui->last = size / sizeof (struct unwind_table_entry) - 1;
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bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table,
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0, size);
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OBJ_UNWIND_INFO (objfile) = ui;
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}
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}
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/* Scan and build partial symbols for a symbol file.
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We have been initialized by a call to pa_symfile_init, which
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currently does nothing.
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SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
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in each section. This is ignored, as it isn't needed for the PA.
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MAINLINE is true if we are reading the main symbol
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table (as opposed to a shared lib or dynamically loaded file).
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This function only does the minimum work necessary for letting the
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user "name" things symbolically; it does not read the entire symtab.
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Instead, it reads the external and static symbols and puts them in partial
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symbol tables. When more extensive information is requested of a
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file, the corresponding partial symbol table is mutated into a full
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fledged symbol table by going back and reading the symbols
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for real.
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We look for sections with specific names, to tell us what debug
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format to look for: FIXME!!!
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pastab_build_psymtabs() handles STABS symbols.
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Note that PA files have a "minimal" symbol table, which is vaguely
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reminiscent of a COFF symbol table, but has only the minimal information
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necessary for linking. We process this also, and use the information to
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build gdb's minimal symbol table. This gives us some minimal debugging
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capability even for files compiled without -g. */
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static void
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pa_symfile_read (objfile, section_offsets, mainline)
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struct objfile *objfile;
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struct section_offsets *section_offsets;
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int mainline;
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{
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bfd *abfd = objfile->obfd;
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struct cleanup *back_to;
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CORE_ADDR offset;
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init_minimal_symbol_collection ();
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back_to = make_cleanup (discard_minimal_symbols, 0);
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make_cleanup (free_painfo, (PTR) objfile);
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/* Process the normal PA symbol table first. */
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/* FIXME, should take a section_offsets param, not just an offset. */
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offset = ANOFFSET (section_offsets, 0);
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pa_symtab_read (abfd, offset, objfile);
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/* Now process debugging information, which is contained in
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special PA sections. */
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pastab_build_psymtabs (objfile, section_offsets, mainline);
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read_unwind_info(objfile);
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do_cleanups (back_to);
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}
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/* This cleans up the objfile's sym_stab_info pointer, and the chain of
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stab_section_info's, that might be dangling from it. */
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static void
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free_painfo (objp)
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PTR objp;
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{
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struct objfile *objfile = (struct objfile *)objp;
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struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
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objfile->sym_stab_info;
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struct stab_section_info *ssi, *nssi;
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ssi = dbxinfo->stab_section_info;
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while (ssi)
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{
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nssi = ssi->next;
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mfree (objfile->md, ssi);
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ssi = nssi;
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}
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dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
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}
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/* Initialize anything that needs initializing when a completely new symbol
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file is specified (not just adding some symbols from another file, e.g. a
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shared library).
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We reinitialize buildsym, since we may be reading stabs from a PA file. */
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static void
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pa_new_init (ignore)
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struct objfile *ignore;
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{
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stabsread_new_init ();
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buildsym_new_init ();
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}
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/* Perform any local cleanups required when we are done with a particular
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objfile. I.E, we are in the process of discarding all symbol information
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for an objfile, freeing up all memory held for it, and unlinking the
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objfile struct from the global list of known objfiles. */
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static void
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pa_symfile_finish (objfile)
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struct objfile *objfile;
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{
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if (objfile -> sym_stab_info != NULL)
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{
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mfree (objfile -> md, objfile -> sym_stab_info);
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}
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}
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/* PA specific initialization routine for reading symbols.
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It is passed a pointer to a struct sym_fns which contains, among other
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things, the BFD for the file whose symbols are being read, and a slot for
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a pointer to "private data" which we can fill with goodies.
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This routine is almost a complete ripoff of dbx_symfile_init. The
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common parts of these routines should be extracted and used instead of
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duplicating this code. FIXME. */
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static void
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pa_symfile_init (objfile)
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struct objfile *objfile;
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{
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int val;
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bfd *sym_bfd = objfile->obfd;
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char *name = bfd_get_filename (sym_bfd);
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asection *stabsect; /* Section containing symbol table entries */
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asection *stringsect; /* Section containing symbol name strings */
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stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$");
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stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$");
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/* Allocate struct to keep track of the symfile */
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objfile->sym_stab_info = (PTR)
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xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
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memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
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if (!stabsect)
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return;
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if (!stringsect)
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error ("Found stabs, but not string section");
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/* FIXME POKING INSIDE BFD DATA STRUCTURES */
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#define STRING_TABLE_OFFSET (stringsect->filepos)
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#define SYMBOL_TABLE_OFFSET (stabsect->filepos)
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/* FIXME POKING INSIDE BFD DATA STRUCTURES */
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DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL;
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DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, "$TEXT$");
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if (!DBX_TEXT_SECT (objfile))
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error ("Can't find $TEXT$ section in symbol file");
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/* FIXME: I suspect this should be external_nlist. The size of host
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types like long and bfd_vma should not affect how we read the
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file. */
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DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist);
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DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect)
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/ DBX_SYMBOL_SIZE (objfile);
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DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET;
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/* Read the string table and stash it away in the psymbol_obstack. It is
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only needed as long as we need to expand psymbols into full symbols,
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so when we blow away the psymbol the string table goes away as well.
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Note that gdb used to use the results of attempting to malloc the
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string table, based on the size it read, as a form of sanity check
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for botched byte swapping, on the theory that a byte swapped string
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table size would be so totally bogus that the malloc would fail. Now
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that we put in on the psymbol_obstack, we can't do this since gdb gets
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a fatal error (out of virtual memory) if the size is bogus. We can
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however at least check to see if the size is zero or some negative
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value. */
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DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect);
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if (DBX_SYMCOUNT (objfile) == 0
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|| DBX_STRINGTAB_SIZE (objfile) == 0)
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return;
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if (DBX_STRINGTAB_SIZE (objfile) <= 0
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|| DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd))
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error ("ridiculous string table size (%d bytes).",
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DBX_STRINGTAB_SIZE (objfile));
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DBX_STRINGTAB (objfile) =
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(char *) obstack_alloc (&objfile -> psymbol_obstack,
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DBX_STRINGTAB_SIZE (objfile));
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/* Now read in the string table in one big gulp. */
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val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET);
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if (val < 0)
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perror_with_name (name);
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val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1,
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sym_bfd);
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if (val == 0)
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error ("End of file reading string table");
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else if (val < 0)
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/* It's possible bfd_read should be setting bfd_error, and we should be
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checking that. But currently it doesn't set bfd_error. */
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perror_with_name (name);
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else if (val != DBX_STRINGTAB_SIZE (objfile))
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error ("Short read reading string table");
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}
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/* PA specific parsing routine for section offsets.
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Plain and simple for now. */
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static struct section_offsets *
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pa_symfile_offsets (objfile, addr)
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struct objfile *objfile;
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CORE_ADDR addr;
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{
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struct section_offsets *section_offsets;
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int i;
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objfile->num_sections = SECT_OFF_MAX;
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section_offsets = (struct section_offsets *)
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obstack_alloc (&objfile -> psymbol_obstack,
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sizeof (struct section_offsets)
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+ sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
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for (i = 0; i < SECT_OFF_MAX; i++)
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ANOFFSET (section_offsets, i) = addr;
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return section_offsets;
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}
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/* Register that we are able to handle SOM object file formats. */
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static struct sym_fns pa_sym_fns =
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{
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bfd_target_som_flavour,
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pa_new_init, /* sym_new_init: init anything gbl to entire symtab */
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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);
|
||
}
|