/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
#include "defs.h"
#include "bfd.h"
-#include "libbfd.h" /* For bfd_elf_find_section */
+#include <string.h>
#include "libelf.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"
/* The struct elfinfo is available only during ELF symbol table and
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));
+free_elfinfo PARAMS ((void *));
static struct section_offsets *
elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
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 */
char *info; /* FIXME, is this really char *? */
struct objfile *objfile;
{
+ int section;
+
+ /* Guess the section from the type. This is likely to be wrong in
+ some cases. */
+ switch (ms_type)
+ {
+ 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:
+ section = SECT_OFF_DATA;
+ break;
+ case mst_bss:
+ case mst_file_bss:
+ section = SECT_OFF_BSS;
+ break;
+ default:
+ section = -1;
+ break;
+ }
+
name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
- prim_record_minimal_symbol_and_info (name, address, ms_type, info, -1);
+ prim_record_minimal_symbol_and_info (name, address, ms_type, info, section,
+ objfile);
}
/*
*/
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;
seen any section info for it yet. */
asymbol *filesym = 0;
struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
- objfile->sym_private;
+ 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 it is a nonstripped executable, do not enter dynamic
+ symbols, as the dynamic symbol table is usually a subset
+ of the main symbol table.
+ On Irix 5 however, the symbols for the procedure linkage
+ table entries have meaningful values only in the dynamic
+ symbol table, so we always examine undefined symbols. */
+ if (dynamic && !stripped && sym -> section != &bfd_und_section)
+ continue;
if (sym -> flags & BSF_FILE)
{
/* STT_FILE debugging symbol that helps stabs-in-elf debugging.
/* 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 == &bfd_abs_section)
+ if (sym -> section == &bfd_und_section
+ && (sym -> flags & BSF_GLOBAL)
+ && (sym -> flags & BSF_FUNCTION))
{
- ms_type = mst_abs;
+ /* Symbol is a reference to a function defined in
+ a shared library.
+ If its value is non zero then it is usually the
+ absolute address of the corresponding entry in
+ the procedure linkage table.
+ 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.
+ Irix 5 has a zero value for all shared library functions
+ in the main symbol table, but the dynamic symbol table
+ provides the right values. */
+ ms_type = mst_solib_trampoline;
+ symaddr = sym -> value;
+ if (symaddr == 0)
+ continue;
+ symaddr += addr;
+ }
+ else if (sym -> section == &bfd_abs_section)
+ {
+ /* 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;
+ }
}
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] == 'L'
+ && 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
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;
}
continue; /* Skip this symbol. */
}
/* Pass symbol size field in via BFD. FIXME!!! */
- size = ((elf32_symbol_type *) sym) -> internal_elf_sym.st_size;
+ size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size;
record_minimal_symbol_and_info ((char *) sym -> name, symaddr,
ms_type, (PTR) size, objfile);
}
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
memset ((char *) &ei, 0, sizeof (ei));
/* Allocate struct to keep track of the symfile */
- objfile->sym_private = (PTR)
+ objfile->sym_stab_info = (PTR)
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... */
}
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 (ei.mdebugsect)
{
- wrap_here ("");
- printf_filtered ("(no debugging symbols found)...");
- wrap_here ("");
+ 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);
}
/* 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
{
struct objfile *objfile = (struct objfile *)objp;
struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
- objfile->sym_private;
+ 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);
}
}
{
struct section_offsets *section_offsets;
int i;
-
+
+ objfile->num_sections = SECT_OFF_MAX;
section_offsets = (struct section_offsets *)
obstack_alloc (&objfile -> psymbol_obstack,
- sizeof (struct section_offsets) +
- sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
+ 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;
}
\f
{
char *filename = pst->filename;
struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
- objfile->sym_private;
+ 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 */
projects / binutils.git / blobdiff