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Diffstat (limited to 'gdb/nlmread.c')
| -rw-r--r-- | gdb/nlmread.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/gdb/nlmread.c b/gdb/nlmread.c new file mode 100644 index 0000000..afdea43 --- /dev/null +++ b/gdb/nlmread.c @@ -0,0 +1,261 @@ +/* Read NLM (NetWare Loadable Module) format executable files for GDB. + Copyright 1993, 1994, 1998 Free Software Foundation, Inc. + Written by Fred Fish at Cygnus Support (fnf@cygnus.com). + +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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "gdb_string.h" +#include "bfd.h" +#include "symtab.h" +#include "symfile.h" +#include "objfiles.h" +#include "gdb-stabs.h" +#include "buildsym.h" +#include "stabsread.h" + +static void +nlm_new_init PARAMS ((struct objfile *)); + +static void +nlm_symfile_init PARAMS ((struct objfile *)); + +static void +nlm_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); + +static void +nlm_symfile_finish PARAMS ((struct objfile *)); + +static void +nlm_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); + +/* 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 gdb will be able to read stabs from an NLM + file at some point in the near future. */ + +static void +nlm_new_init (ignore) + struct objfile *ignore; +{ + stabsread_new_init (); + buildsym_new_init (); +} + + +/* NLM 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. + + For now at least, we have nothing in particular to do, so this function is + just a stub. */ + +static void +nlm_symfile_init (ignore) + struct objfile *ignore; +{ +} + +/* + +LOCAL FUNCTION + + nlm_symtab_read -- read the symbol table of an NLM file + +SYNOPSIS + + void nlm_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 +nlm_symtab_read (abfd, addr, objfile) + bfd *abfd; + CORE_ADDR addr; + struct objfile *objfile; +{ + long storage_needed; + asymbol *sym; + asymbol **symbol_table; + long number_of_symbols; + long i; + struct cleanup *back_to; + CORE_ADDR symaddr; + enum minimal_symbol_type ms_type; + + storage_needed = bfd_get_symtab_upper_bound (abfd); + if (storage_needed < 0) + error ("Can't read symbols from %s: %s", bfd_get_filename (abfd), + bfd_errmsg (bfd_get_error ())); + if (storage_needed > 0) + { + symbol_table = (asymbol **) xmalloc (storage_needed); + back_to = make_cleanup (free, symbol_table); + number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); + if (number_of_symbols < 0) + error ("Can't read symbols from %s: %s", bfd_get_filename (abfd), + bfd_errmsg (bfd_get_error ())); + + for (i = 0; i < number_of_symbols; i++) + { + sym = symbol_table[i]; + if (/*sym -> flags & BSF_GLOBAL*/ 1) + { + /* Bfd symbols are section relative. */ + symaddr = sym -> value + sym -> section -> vma; + /* Relocate all non-absolute symbols by base address. */ + if (sym -> section != &bfd_abs_section) + symaddr += addr; + + /* For non-absolute symbols, use the type of the section + they are relative to, to intuit text/data. BFD provides + no way of figuring this out for absolute symbols. */ + if (sym -> section -> flags & SEC_CODE) + ms_type = mst_text; + else if (sym -> section -> flags & SEC_DATA) + ms_type = mst_data; + else + ms_type = mst_unknown; + + prim_record_minimal_symbol (sym -> name, symaddr, ms_type, + objfile); + } + } + do_cleanups (back_to); + } +} + + +/* Scan and build partial symbols for a symbol file. + We have been initialized by a call to nlm_symfile_init, which + currently does nothing. + + SECTION_OFFSETS is a set of offsets to apply to relocate the symbols + in each section. We simplify it down to a single offset for all + symbols. FIXME. + + 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. + + Note that NLM files have two sets of information that is potentially + useful for building gdb's minimal symbol table. The first is a list + of the publically exported symbols, and is currently used to build + bfd's canonical symbol table. The second is an optional native debugging + format which contains additional symbols (and possibly duplicates of + the publically exported symbols). The optional native debugging format + is not currently used. */ + +static void +nlm_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; + struct symbol *mainsym; + + init_minimal_symbol_collection (); + back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); + + /* FIXME, should take a section_offsets param, not just an offset. */ + + offset = ANOFFSET (section_offsets, 0); + + /* Process the NLM export records, which become the bfd's canonical symbol + table. */ + + nlm_symtab_read (abfd, offset, objfile); + + stabsect_build_psymtabs (objfile, section_offsets, mainline, ".stab", + ".stabstr", ".text"); + + mainsym = lookup_symbol ("main", NULL, VAR_NAMESPACE, NULL, NULL); + + if (mainsym + && SYMBOL_CLASS(mainsym) == LOC_BLOCK) + { + objfile->ei.main_func_lowpc = BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym)); + objfile->ei.main_func_highpc = BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym)); + } + + /* FIXME: We could locate and read the optional native debugging format + here and add the symbols to the minimal symbol table. */ + + /* Install any minimal symbols that have been collected as the current + minimal symbols for this objfile. */ + + install_minimal_symbols (objfile); + + do_cleanups (back_to); +} + + +/* 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 +nlm_symfile_finish (objfile) + struct objfile *objfile; +{ + if (objfile -> sym_private != NULL) + { + mfree (objfile -> md, objfile -> sym_private); + } +} + +/* Register that we are able to handle NLM file format. */ + +static struct sym_fns nlm_sym_fns = +{ + bfd_target_nlm_flavour, + nlm_new_init, /* sym_new_init: init anything gbl to entire symtab */ + nlm_symfile_init, /* sym_init: read initial info, setup for sym_read() */ + nlm_symfile_read, /* sym_read: read a symbol file into symtab */ + nlm_symfile_finish, /* sym_finish: finished with file, cleanup */ + default_symfile_offsets, + /* sym_offsets: Translate ext. to int. relocation */ + NULL /* next: pointer to next struct sym_fns */ +}; + +void +_initialize_nlmread () +{ + add_symtab_fns (&nlm_sym_fns); +} |