438 lines
14 KiB
C
438 lines
14 KiB
C
/* Read HP PA/Risc object files for GDB.
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Copyright (C) 1991-1992, 1994-1996, 1998-2002, 2004, 2007-2012 Free
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "bfd.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 "gdb_string.h"
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#include "demangle.h"
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#include "som.h"
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#include "libhppa.h"
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#include "psymtab.h"
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#include "solib-som.h"
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/* Read the symbol table of a SOM file.
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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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static void
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som_symtab_read (bfd *abfd, struct objfile *objfile,
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struct section_offsets *section_offsets)
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{
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struct gdbarch *gdbarch = get_objfile_arch (objfile);
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unsigned int number_of_symbols;
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int val, dynamic;
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char *stringtab;
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asection *shlib_info;
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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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CORE_ADDR text_offset, data_offset;
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text_offset = ANOFFSET (section_offsets, 0);
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data_offset = ANOFFSET (section_offsets, 1);
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number_of_symbols = bfd_get_symcount (abfd);
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/* Allocate a buffer to read in the debug info.
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We avoid using alloca because the memory size could be so large
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that we could hit the stack size limit. */
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buf = xmalloc (symsize * number_of_symbols);
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make_cleanup (xfree, buf);
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bfd_seek (abfd, obj_som_sym_filepos (abfd), SEEK_SET);
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val = bfd_bread (buf, symsize * number_of_symbols, 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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/* Allocate a buffer to read in the som stringtab section of
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the debugging info. Again, we avoid using alloca because
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the data could be so large that we could potentially hit
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the stack size limitat. */
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stringtab = xmalloc (obj_som_stringtab_size (abfd));
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make_cleanup (xfree, stringtab);
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bfd_seek (abfd, obj_som_str_filepos (abfd), SEEK_SET);
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val = bfd_bread (stringtab, obj_som_stringtab_size (abfd), 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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/* We need to determine if objfile is a dynamic executable (so we
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can do the right thing for ST_ENTRY vs ST_CODE symbols).
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There's nothing in the header which easily allows us to do
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this.
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This code used to rely upon the existence of a $SHLIB_INFO$
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section to make this determination. HP claims that it is
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more accurate to check for a nonzero text offset, but they
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have not provided any information about why that test is
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more accurate. */
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dynamic = (text_offset != 0);
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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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case SS_EXTERNAL:
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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_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 += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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break;
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case ST_ENTRY:
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symname = bufp->name.n_strx + stringtab;
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/* For a dynamic executable, ST_ENTRY symbols are
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the stubs, while the ST_CODE symbol is the real
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function. */
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if (dynamic)
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ms_type = mst_solib_trampoline;
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else
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ms_type = mst_text;
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bufp->symbol_value += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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break;
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case ST_STUB:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_solib_trampoline;
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bufp->symbol_value += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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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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bufp->symbol_value += data_offset;
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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 += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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check_strange_names:
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/* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local
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label prefixes for stabs, constant data, etc. So we need
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only filter out L$ symbols which are left in due to
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limitations in how GAS generates SOM relocations.
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When linking in the HPUX C-library the HP linker has
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the nasty habit of placing section symbols from the literal
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subspaces in the middle of the program's text. Filter
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those out as best we can. Check for first and last character
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being '$'.
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And finally, the newer HP compilers emit crud like $PIC_foo$N
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in some circumstance (PIC code I guess). It's also claimed
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that they emit D$ symbols too. What stupidity. */
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if ((symname[0] == 'L' && symname[1] == '$')
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|| (symname[0] == '$' && symname[strlen (symname) - 1] == '$')
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|| (symname[0] == 'D' && symname[1] == '$')
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|| (strncmp (symname, "L0\001", 3) == 0)
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|| (strncmp (symname, "$PIC", 4) == 0))
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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_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 += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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break;
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case ST_ENTRY:
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symname = bufp->name.n_strx + stringtab;
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/* SS_LOCAL symbols in a shared library do not have
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export stubs, so we do not have to worry about
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using mst_file_text vs mst_solib_trampoline here like
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we do for SS_UNIVERSAL and SS_EXTERNAL symbols above. */
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ms_type = mst_file_text;
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bufp->symbol_value += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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break;
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case ST_STUB:
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symname = bufp->name.n_strx + stringtab;
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ms_type = mst_solib_trampoline;
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bufp->symbol_value += text_offset;
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bufp->symbol_value = gdbarch_smash_text_address
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(gdbarch, bufp->symbol_value);
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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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bufp->symbol_value += data_offset;
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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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/* This can happen for common symbols when -E is passed to the
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final link. No idea _why_ that would make the linker force
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common symbols to have an SS_UNSAT scope, but it does.
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This also happens for weak symbols, but their type is
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ST_DATA. */
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case SS_UNSAT:
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switch (bufp->symbol_type)
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{
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case ST_STORAGE:
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case ST_DATA:
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symname = bufp->name.n_strx + stringtab;
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bufp->symbol_value += data_offset;
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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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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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prim_record_minimal_symbol (symname, bufp->symbol_value, ms_type,
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objfile);
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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 som_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 SOM.
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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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somstab_build_psymtabs() handles STABS symbols.
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Note that SOM 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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som_symfile_read (struct objfile *objfile, int symfile_flags)
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{
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bfd *abfd = objfile->obfd;
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struct cleanup *back_to;
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init_minimal_symbol_collection ();
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back_to = make_cleanup_discard_minimal_symbols ();
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/* Process the normal SOM symbol table first.
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This reads in the DNTT and string table, but doesn't
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actually scan the DNTT. It does scan the linker symbol
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table and thus build up a "minimal symbol table". */
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som_symtab_read (abfd, objfile, objfile->section_offsets);
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/* Install any minimal symbols that have been collected as the current
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minimal symbols for this objfile.
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Further symbol-reading is done incrementally, file-by-file,
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in a step known as "psymtab-to-symtab" expansion. hp-symtab-read.c
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contains the code to do the actual DNTT scanning and symtab building. */
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install_minimal_symbols (objfile);
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do_cleanups (back_to);
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/* Now read information from the stabs debug sections.
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This is emitted by gcc. */
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stabsect_build_psymtabs (objfile,
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"$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$");
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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 SOM file. */
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static void
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som_new_init (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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som_symfile_finish (struct objfile *objfile)
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{
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if (objfile->deprecated_sym_stab_info != NULL)
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{
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xfree (objfile->deprecated_sym_stab_info);
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}
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}
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/* SOM specific initialization routine for reading symbols. */
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static void
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som_symfile_init (struct objfile *objfile)
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{
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/* SOM objects may be reordered, so set OBJF_REORDERED. If we
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find this causes a significant slowdown in gdb then we could
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set it in the debug symbol readers only when necessary. */
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objfile->flags |= OBJF_REORDERED;
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}
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/* SOM specific parsing routine for section offsets.
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Plain and simple for now. */
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static void
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som_symfile_offsets (struct objfile *objfile, struct section_addr_info *addrs)
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{
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int i;
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CORE_ADDR text_addr;
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objfile->num_sections = bfd_count_sections (objfile->obfd);
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objfile->section_offsets = (struct section_offsets *)
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obstack_alloc (&objfile->objfile_obstack,
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SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
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/* FIXME: ezannoni 2000-04-20 The section names in SOM are not
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.text, .data, etc, but $TEXT$, $DATA$,... We should initialize
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SET_OFF_* from bfd. (See default_symfile_offsets()). But I don't
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know the correspondence between SOM sections and GDB's idea of
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section names. So for now we default to what is was before these
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changes. */
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objfile->sect_index_text = 0;
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objfile->sect_index_data = 1;
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objfile->sect_index_bss = 2;
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objfile->sect_index_rodata = 3;
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/* First see if we're a shared library. If so, get the section
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offsets from the library, else get them from addrs. */
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if (!som_solib_section_offsets (objfile, objfile->section_offsets))
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{
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/* Note: Here is OK to compare with ".text" because this is the
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name that gdb itself gives to that section, not the SOM
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name. */
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for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
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if (strcmp (addrs->other[i].name, ".text") == 0)
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break;
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text_addr = addrs->other[i].addr;
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for (i = 0; i < objfile->num_sections; i++)
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(objfile->section_offsets)->offsets[i] = text_addr;
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}
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}
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/* Register that we are able to handle SOM object file formats. */
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static const struct sym_fns som_sym_fns =
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{
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bfd_target_som_flavour,
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som_new_init, /* init anything gbl to entire symtab */
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som_symfile_init, /* read initial info, setup for sym_read() */
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som_symfile_read, /* read a symbol file into symtab */
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NULL, /* sym_read_psymbols */
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som_symfile_finish, /* finished with file, cleanup */
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som_symfile_offsets, /* Translate ext. to int. relocation */
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default_symfile_segments, /* Get segment information from a file. */
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NULL,
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default_symfile_relocate, /* Relocate a debug section. */
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&psym_functions
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};
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void
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_initialize_somread (void)
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{
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add_symtab_fns (&som_sym_fns);
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}
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