/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1991, 92, 93, 94, 95, 96, 1998 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
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. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "bfd.h"
-#include <time.h> /* For time_t in libbfd.h. */
-#include <sys/types.h> /* For time_t, if not in time.h. */
-#include "libbfd.h" /* For bfd_elf_find_section */
-#include "libelf.h"
+#include "gdb_string.h"
+#include "elf-bfd.h"
+#include "elf/mips.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "stabsread.h"
#include "gdb-stabs.h"
#include "complaints.h"
-#include <string.h>
#include "demangle.h"
+extern void _initialize_elfread PARAMS ((void));
+
/* The struct elfinfo is available only during ELF symbol table and
psymtab reading. It is destroyed at the complation of psymtab-reading.
It's local to elf_symfile_read. */
unsigned int lnsize; /* Size of dwarf line number section */
asection *stabsect; /* Section pointer for .stab section */
asection *stabindexsect; /* Section pointer for .stab.index section */
+ asection *mdebugsect; /* Section pointer for .mdebug section */
};
/* Various things we might complain about... */
elf_symfile_finish PARAMS ((struct objfile *));
static void
-elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
+elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *, int));
static void
-free_elfinfo PARAMS ((PTR));
-
-static struct section_offsets *
-elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
+free_elfinfo PARAMS ((void *));
-static void
+static struct minimal_symbol *
record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR,
enum minimal_symbol_type, char *,
+ asection *bfd_section,
struct objfile *));
static void
-elf_locate_sections PARAMS ((bfd *, asection *, PTR));
+elf_locate_sections PARAMS ((bfd *, asection *, void *));
/* We are called once per section from elf_symfile_read. We
need to examine each section we are passed, check to see
We also recognize the ".stab" sections used by the Sun compilers
released with Solaris 2.
- FIXME: The section names should not be hardwired strings. */
+ FIXME: The section names should not be hardwired strings (what
+ should they be? I don't think most object file formats have enough
+ section flags to specify what kind of debug section it is
+ -kingdon). */
static void
elf_locate_sections (ignore_abfd, sectp, eip)
{
ei -> stabindexsect = sectp;
}
+ else if (STREQ (sectp -> name, ".mdebug"))
+ {
+ ei -> mdebugsect = sectp;
+ }
}
#if 0 /* Currently unused */
#endif
-static void
-record_minimal_symbol_and_info (name, address, ms_type, info, objfile)
+static struct minimal_symbol *
+record_minimal_symbol_and_info (name, address, ms_type, info, bfd_section,
+ objfile)
char *name;
CORE_ADDR address;
enum minimal_symbol_type ms_type;
char *info; /* FIXME, is this really char *? */
+ asection *bfd_section;
struct objfile *objfile;
{
int section;
case mst_text:
case mst_file_text:
section = SECT_OFF_TEXT;
+#ifdef SMASH_TEXT_ADDRESS
+ SMASH_TEXT_ADDRESS (address);
+#endif
break;
case mst_data:
case mst_file_data:
break;
}
- name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
- prim_record_minimal_symbol_and_info (name, address, ms_type, info, section);
+ return prim_record_minimal_symbol_and_info
+ (name, address, ms_type, info, section, bfd_section, objfile);
}
/*
SYNOPSIS
void elf_symtab_read (bfd *abfd, CORE_ADDR addr,
- struct objfile *objfile)
+ struct objfile *objfile, int dynamic)
DESCRIPTION
*/
static void
-elf_symtab_read (abfd, addr, objfile)
+elf_symtab_read (abfd, addr, objfile, dynamic)
bfd *abfd;
CORE_ADDR addr;
struct objfile *objfile;
+ int dynamic;
{
- unsigned int storage_needed;
+ long storage_needed;
asymbol *sym;
asymbol **symbol_table;
- unsigned int number_of_symbols;
- unsigned int i;
+ long number_of_symbols;
+ long i;
int index;
struct cleanup *back_to;
CORE_ADDR symaddr;
/* If filesym is nonzero, it points to a file symbol, but we haven't
seen any section info for it yet. */
asymbol *filesym = 0;
- struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
- objfile->sym_private;
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ /* Name of filesym, as saved on the symbol_obstack. */
+ char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack);
+#endif
+ struct dbx_symfile_info *dbx = objfile->sym_stab_info;
unsigned long size;
-
- storage_needed = get_symtab_upper_bound (abfd);
+ int stripped = (bfd_get_symcount (abfd) == 0);
+
+ if (dynamic)
+ {
+ storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
+
+ /* Nothing to be done if there is no dynamic symtab. */
+ if (storage_needed < 0)
+ return;
+ }
+ else
+ {
+ 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 (dynamic)
+ number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd,
+ symbol_table);
+ else
+ 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];
that are null strings (may happen). */
continue;
}
+
+ if (dynamic
+ && sym -> section == &bfd_und_section
+ && (sym -> flags & BSF_FUNCTION))
+ {
+ struct minimal_symbol *msym;
+
+ /* Symbol is a reference to a function defined in
+ a shared library.
+ If its value is non zero then it is usually the address
+ of the corresponding entry in the procedure linkage table,
+ relative to the base address.
+ If its value is zero then the dynamic linker has to resolve
+ the symbol. We are unable to find any meaningful address
+ for this symbol in the executable file, so we skip it. */
+ symaddr = sym -> value;
+ if (symaddr == 0)
+ continue;
+ symaddr += addr;
+ msym = record_minimal_symbol_and_info
+ ((char *) sym -> name, symaddr,
+ mst_solib_trampoline, NULL, sym -> section, objfile);
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ if (msym != NULL)
+ msym->filename = filesymname;
+#endif
+ continue;
+ }
+
+ /* If it is a nonstripped executable, do not enter dynamic
+ symbols, as the dynamic symbol table is usually a subset
+ of the main symbol table. */
+ if (dynamic && !stripped)
+ continue;
if (sym -> flags & BSF_FILE)
{
/* STT_FILE debugging symbol that helps stabs-in-elf debugging.
sectinfo = NULL;
}
filesym = sym;
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ filesymname =
+ obsavestring ((char *)filesym->name, strlen (filesym->name),
+ &objfile->symbol_obstack);
+#endif
}
else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
{
+ struct minimal_symbol *msym;
+
/* Select global/local/weak symbols. Note that bfd puts abs
symbols in their own section, so all symbols we are
interested in will have a section. */
no way of figuring this out for absolute symbols. */
if (sym -> section == &bfd_abs_section)
{
- ms_type = mst_abs;
+ /* This is a hack to get the minimal symbol type
+ right for Irix 5, which has absolute adresses
+ with special section indices for dynamic symbols. */
+ unsigned short shndx =
+ ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
+
+ switch (shndx)
+ {
+ case SHN_MIPS_TEXT:
+ ms_type = mst_text;
+ break;
+ case SHN_MIPS_DATA:
+ ms_type = mst_data;
+ break;
+ case SHN_MIPS_ACOMMON:
+ ms_type = mst_bss;
+ break;
+ default:
+ ms_type = mst_abs;
+ }
+
+ /* If it is an Irix dynamic symbol, skip section name
+ symbols, relocate all others. */
+ if (ms_type != mst_abs)
+ {
+ if (sym->name[0] == '.')
+ continue;
+ symaddr += addr;
+ }
}
else if (sym -> section -> flags & SEC_CODE)
{
{
ms_type = mst_text;
}
- else if (sym->name[0] == '.' && sym->name[1] == 'L')
+ else if ((sym->name[0] == '.' && sym->name[1] == 'L')
+ || ((sym -> flags & BSF_LOCAL)
+ && sym->name[0] == '$'
+ && sym->name[1] == 'L'))
/* Looks like a compiler-generated label. Skip it.
The assembler should be skipping these (to keep
executables small), but apparently with gcc on the
should be harmless (but I encourage people to fix this
in the assembler instead of adding checks here). */
continue;
+#ifdef HARRIS_TARGET
+ else if (sym->name[0] == '.' && sym->name[1] == '.')
+ {
+ /* Looks like a Harris compiler generated label for the
+ purpose of marking instructions that are relevant to
+ DWARF dies. The assembler can't get rid of these
+ because they are relocatable addresses that the
+ linker needs to resolve. */
+ continue;
+ }
+#endif
else
{
ms_type = mst_file_text;
}
}
- else if (sym -> section -> flags & SEC_DATA)
+ else if (sym -> section -> flags & SEC_ALLOC)
{
if (sym -> flags & BSF_GLOBAL)
{
- if (sym -> section -> flags & SEC_HAS_CONTENTS)
+ if (sym -> section -> flags & SEC_LOAD)
{
ms_type = mst_data;
}
}
/* Not a special stabs-in-elf symbol, do regular
symbol processing. */
- if (sym -> section -> flags & SEC_HAS_CONTENTS)
+ if (sym -> section -> flags & SEC_LOAD)
{
ms_type = mst_file_data;
}
}
/* Pass symbol size field in via BFD. FIXME!!! */
size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size;
- record_minimal_symbol_and_info ((char *) sym -> name, symaddr,
- ms_type, (PTR) size, objfile);
+ msym = record_minimal_symbol_and_info
+ ((char *) sym -> name, symaddr,
+ ms_type, (PTR) size, sym -> section, objfile);
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ if (msym != NULL)
+ msym->filename = filesymname;
+#endif
+#ifdef ELF_MAKE_MSYMBOL_SPECIAL
+ ELF_MAKE_MSYMBOL_SPECIAL(sym,msym);
+#endif
}
}
do_cleanups (back_to);
format to look for: FIXME!!!
dwarf_build_psymtabs() builds psymtabs for DWARF symbols;
- elfstab_build_psymtabs() handles STABS symbols.
+ elfstab_build_psymtabs() handles STABS symbols;
+ mdebug_build_psymtabs() handles ECOFF debugging information.
Note that ELF files have a "minimal" symbol table, which looks a lot
like a COFF symbol table, but has only the minimal information necessary
CORE_ADDR offset;
init_minimal_symbol_collection ();
- back_to = make_cleanup (discard_minimal_symbols, 0);
+ back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
memset ((char *) &ei, 0, sizeof (ei));
/* Allocate struct to keep track of the symfile */
- objfile->sym_private = (PTR)
+ objfile->sym_stab_info = (struct dbx_symfile_info *)
xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
- memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info));
+ memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
make_cleanup (free_elfinfo, (PTR) objfile);
/* Process the normal ELF symbol table first. This may write some
- chain of info into the dbx_symfile_info in objfile->sym_private,
+ chain of info into the dbx_symfile_info in objfile->sym_stab_info,
which can later be used by elfstab_offset_sections. */
/* FIXME, should take a section_offsets param, not just an offset. */
offset = ANOFFSET (section_offsets, 0);
- elf_symtab_read (abfd, offset, objfile);
+ elf_symtab_read (abfd, offset, objfile, 0);
+
+ /* Add the dynamic symbols. */
+
+ elf_symtab_read (abfd, offset, objfile, 1);
/* Now process debugging information, which is contained in
- special ELF sections. We first have to find them... */
+ special ELF sections. */
+
+ /* If we are reinitializing, or if we have never loaded syms yet,
+ set table to empty. MAINLINE is cleared so that *_read_psymtab
+ functions do not all also re-initialize the psymbol table. */
+ if (mainline)
+ {
+ init_psymbol_list (objfile, 0);
+ mainline = 0;
+ }
+ /* We first have to find them... */
bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei);
- if (ei.dboffset && ei.lnoffset)
+
+ /* ELF debugging information is inserted into the psymtab in the
+ order of least informative first - most informative last. Since
+ the psymtab table is searched `most recent insertion first' this
+ increases the probability that more detailed debug information
+ for a section is found.
+
+ For instance, an object file might contain both .mdebug (XCOFF)
+ and .debug_info (DWARF2) sections then .mdebug is inserted first
+ (searched last) and DWARF2 is inserted last (searched first). If
+ we don't do this then the XCOFF info is found first - for code in
+ an included file XCOFF info is useless. */
+
+ if (ei.mdebugsect)
{
- /* DWARF sections */
- dwarf_build_psymtabs (objfile,
- section_offsets, mainline,
- ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize);
+ const struct ecoff_debug_swap *swap;
+
+ /* .mdebug section, presumably holding ECOFF debugging
+ information. */
+ swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
+ if (swap)
+ elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect,
+ section_offsets);
}
if (ei.stabsect)
{
- /* STABS sections */
-
- /* FIXME: Sun didn't really know how to implement this well.
- They made .stab sections that don't point to the .stabstr
- section with the sh_link field. BFD doesn't make string table
- sections visible to the caller. So we have to search the
- ELF section table, not the BFD section table, for the string
- table. */
- struct elf32_internal_shdr *elf_sect;
-
- elf_sect = bfd_elf_find_section (abfd, ".stabstr");
- if (elf_sect)
+ asection *str_sect;
+
+ /* Stab sections have an associated string table that looks like
+ a separate section. */
+ str_sect = bfd_get_section_by_name (abfd, ".stabstr");
+
+ /* FIXME should probably warn about a stab section without a stabstr. */
+ if (str_sect)
elfstab_build_psymtabs (objfile,
- section_offsets,
- mainline,
- ei.stabsect->filepos, /* .stab offset */
- bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */
- (file_ptr) elf_sect->sh_offset, /* .stabstr offset */
- elf_sect->sh_size); /* .stabstr size */
+ section_offsets,
+ mainline,
+ ei.stabsect->filepos,
+ bfd_section_size (abfd, ei.stabsect),
+ str_sect->filepos,
+ bfd_section_size (abfd, str_sect));
}
-
- if (!have_partial_symbols ())
+ if (dwarf2_has_info (abfd))
+ {
+ /* DWARF 2 sections */
+ dwarf2_build_psymtabs (objfile, section_offsets, mainline);
+ }
+ else if (ei.dboffset && ei.lnoffset)
{
- wrap_here ("");
- printf_filtered ("(no debugging symbols found)...");
- wrap_here ("");
+ /* DWARF sections */
+ dwarf_build_psymtabs (objfile,
+ section_offsets, mainline,
+ ei.dboffset, ei.dbsize,
+ ei.lnoffset, ei.lnsize);
}
/* Install any minimal symbols that have been collected as the current
do_cleanups (back_to);
}
-/* This cleans up the objfile's sym_private pointer, and the chain of
+/* This cleans up the objfile's sym_stab_info pointer, and the chain of
stab_section_info's, that might be dangling from it. */
static void
PTR objp;
{
struct objfile *objfile = (struct objfile *)objp;
- struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
- objfile->sym_private;
+ struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info;
struct stab_section_info *ssi, *nssi;
ssi = dbxinfo->stab_section_info;
elf_symfile_finish (objfile)
struct objfile *objfile;
{
- if (objfile -> sym_private != NULL)
+ if (objfile -> sym_stab_info != NULL)
{
- mfree (objfile -> md, objfile -> sym_private);
+ mfree (objfile -> md, objfile -> sym_stab_info);
}
}
just a stub. */
static void
-elf_symfile_init (ignore)
- struct objfile *ignore;
-{
-}
-
-/* ELF specific parsing routine for section offsets.
-
- Plain and simple for now. */
-
-static
-struct section_offsets *
-elf_symfile_offsets (objfile, addr)
+elf_symfile_init (objfile)
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;
+ /* ELF objects may be reordered, so set OBJF_REORDERED. If we
+ find this causes a significant slowdown in gdb then we could
+ set it in the debug symbol readers only when necessary. */
+ objfile->flags |= OBJF_REORDERED;
}
-\f
+
/* When handling an ELF file that contains Sun STABS debug info,
some of the debug info is relative to the particular chunk of the
section that was generated in its individual .o file. E.g.
struct partial_symtab *pst;
{
char *filename = pst->filename;
- struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
- objfile->sym_private;
+ struct dbx_symfile_info *dbx = objfile->sym_stab_info;
struct stab_section_info *maybe = dbx->stab_section_info;
struct stab_section_info *questionable = 0;
int i;
complain (&stab_info_mismatch_complaint, filename);
}
\f
-/* Register that we are able to handle ELF object file formats and DWARF
- debugging formats.
-
- Unlike other object file formats, where the debugging information format
- is implied by the object file format, the ELF object file format and the
- DWARF debugging information format are two distinct, and potentially
- separate entities. I.E. it is perfectly possible to have ELF objects
- with debugging formats other than DWARF. And it is conceivable that the
- DWARF debugging format might be used with another object file format,
- like COFF, by simply using COFF's custom section feature.
-
- GDB, and to a lesser extent BFD, should support the notion of separate
- object file formats and debugging information formats. For now, we just
- use "elf" in the same sense as "a.out" or "coff", to imply both the ELF
- object file format and the DWARF debugging format. */
+/* Register that we are able to handle ELF object file formats. */
static struct sym_fns elf_sym_fns =
{
- "elf", /* sym_name: name or name prefix of BFD target type */
- 3, /* sym_namelen: number of significant sym_name chars */
+ bfd_target_elf_flavour,
elf_new_init, /* sym_new_init: init anything gbl to entire symtab */
elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */
elf_symfile_read, /* sym_read: read a symbol file into symtab */
elf_symfile_finish, /* sym_finish: finished with file, cleanup */
- elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
+ default_symfile_offsets,
+ /* sym_offsets: Translate ext. to int. relocation */
NULL /* next: pointer to next struct sym_fns */
};
projects / deliverable / binutils-gdb.git / blobdiff