/* Read ELF (Executable and Linking Format) object files for GDB.
Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
for (j = 0; j < num_segments; j++)
if (segments[j]->p_memsz > 0
&& vma >= segments[j]->p_vaddr
- && vma < segments[j]->p_vaddr + segments[j]->p_memsz)
+ && (vma - segments[j]->p_vaddr) < segments[j]->p_memsz)
{
data->segment_info[i] = j + 1;
break;
}
- if (bfd_get_section_size (sect) > 0 && j == num_segments)
+ /* We should have found a segment for every non-empty section.
+ If we haven't, we will not relocate this section by any
+ offsets we apply to the segments. As an exception, do not
+ warn about SHT_NOBITS sections; in normal ELF execution
+ environments, SHT_NOBITS means zero-initialized and belongs
+ in a segment, but in no-OS environments some tools (e.g. ARM
+ RealView) use SHT_NOBITS for uninitialized data. Since it is
+ uninitialized, it doesn't need a program header. Such
+ binaries are not relocatable. */
+ if (bfd_get_section_size (sect) > 0 && j == num_segments
+ && (bfd_get_section_flags (abfd, sect) & SEC_LOAD) != 0)
warning (_("Loadable segment \"%s\" outside of ELF segments"),
bfd_section_name (abfd, sect));
}
}
static struct minimal_symbol *
-record_minimal_symbol (char *name, CORE_ADDR address,
+record_minimal_symbol (const char *name, int name_len, int copy_name,
+ CORE_ADDR address,
enum minimal_symbol_type ms_type,
asection *bfd_section, struct objfile *objfile)
{
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
+
if (ms_type == mst_text || ms_type == mst_file_text)
- address = gdbarch_smash_text_address (current_gdbarch, address);
+ address = gdbarch_smash_text_address (gdbarch, address);
- return prim_record_minimal_symbol_and_info
- (name, address, ms_type, NULL, bfd_section->index, bfd_section, objfile);
+ return prim_record_minimal_symbol_full (name, name_len, copy_name, address,
+ ms_type, bfd_section->index,
+ bfd_section, objfile);
}
/*
SYNOPSIS
- void elf_symtab_read (struct objfile *objfile, int dynamic,
+ void elf_symtab_read (struct objfile *objfile, int type,
long number_of_symbols, asymbol **symbol_table)
DESCRIPTION
Given an objfile, a symbol table, and a flag indicating whether the
- symbol table contains dynamic symbols, add all the global function
- and data symbols to the minimal symbol table.
+ symbol table contains regular, dynamic, or synthetic symbols, add all
+ the global function and data symbols to the minimal symbol table.
In stabs-in-ELF, as implemented by Sun, there are some local symbols
defined in the ELF symbol table, which can be used to locate
*/
+#define ST_REGULAR 0
+#define ST_DYNAMIC 1
+#define ST_SYNTHETIC 2
+
static void
-elf_symtab_read (struct objfile *objfile, int dynamic,
- long number_of_symbols, asymbol **symbol_table)
+elf_symtab_read (struct objfile *objfile, int type,
+ long number_of_symbols, asymbol **symbol_table,
+ int copy_names)
{
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
long storage_needed;
asymbol *sym;
long i;
/* If filesym is nonzero, it points to a file symbol, but we haven't
seen any section info for it yet. */
asymbol *filesym = 0;
- /* Name of filesym, as saved on the objfile_obstack. */
- char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack);
+ /* Name of filesym. This is either a constant string or is saved on
+ the objfile's obstack. */
+ char *filesymname = "";
struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
int stripped = (bfd_get_symcount (objfile->obfd) == 0);
symbols which do not correspond to objects in the symbol table,
but have some other target-specific meaning. */
if (bfd_is_target_special_symbol (objfile->obfd, sym))
- continue;
+ {
+ if (gdbarch_record_special_symbol_p (gdbarch))
+ gdbarch_record_special_symbol (gdbarch, objfile, sym);
+ continue;
+ }
offset = ANOFFSET (objfile->section_offsets, sym->section->index);
- if (dynamic
+ if (type == ST_DYNAMIC
&& sym->section == &bfd_und_section
&& (sym->flags & BSF_FUNCTION))
{
struct minimal_symbol *msym;
+ bfd *abfd = objfile->obfd;
+ asection *sect;
/* Symbol is a reference to a function defined in
a shared library.
symaddr = sym->value;
if (symaddr == 0)
continue;
- symaddr += offset;
+
+ /* sym->section is the undefined section. However, we want to
+ record the section where the PLT stub resides with the
+ minimal symbol. Search the section table for the one that
+ covers the stub's address. */
+ for (sect = abfd->sections; sect != NULL; sect = sect->next)
+ {
+ if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
+ continue;
+
+ if (symaddr >= bfd_get_section_vma (abfd, sect)
+ && symaddr < bfd_get_section_vma (abfd, sect)
+ + bfd_get_section_size (sect))
+ break;
+ }
+ if (!sect)
+ continue;
+
+ symaddr += ANOFFSET (objfile->section_offsets, sect->index);
+
msym = record_minimal_symbol
- ((char *) sym->name, symaddr,
- mst_solib_trampoline, sym->section, objfile);
+ (sym->name, strlen (sym->name), copy_names,
+ symaddr, mst_solib_trampoline, sect, objfile);
if (msym != NULL)
msym->filename = filesymname;
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)
+ if (type == ST_DYNAMIC && !stripped)
continue;
if (sym->flags & BSF_FILE)
{
interested in will have a section. */
/* Bfd symbols are section relative. */
symaddr = sym->value + sym->section->vma;
- /* Relocate all non-absolute symbols by the section offset. */
- if (sym->section != &bfd_abs_section)
+ /* Relocate all non-absolute and non-TLS symbols by the
+ section offset. */
+ if (sym->section != &bfd_abs_section
+ && !(sym->section->flags & SEC_THREAD_LOCAL))
{
symaddr += offset;
}
{
/* This is a hack to get the minimal symbol type
right for Irix 5, which has absolute addresses
- with special section indices for dynamic symbols. */
- unsigned short shndx =
+ with special section indices for dynamic symbols.
+
+ NOTE: uweigand-20071112: Synthetic symbols do not
+ have an ELF-private part, so do not touch those. */
+ unsigned int shndx = type == ST_SYNTHETIC ? 0 :
((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
switch (shndx)
int max_index;
size_t size;
- max_index
- = max (SECT_OFF_BSS (objfile),
- max (SECT_OFF_DATA (objfile),
- SECT_OFF_RODATA (objfile)));
+ max_index = SECT_OFF_BSS (objfile);
+ if (objfile->sect_index_data > max_index)
+ max_index = objfile->sect_index_data;
+ if (objfile->sect_index_rodata > max_index)
+ max_index = objfile->sect_index_rodata;
/* max_index is the largest index we'll
use into this array, so we must
continue; /* Skip this symbol. */
}
msym = record_minimal_symbol
- ((char *) sym->name, symaddr,
+ (sym->name, strlen (sym->name), copy_names, symaddr,
ms_type, sym->section, objfile);
+
if (msym)
{
/* Pass symbol size field in via BFD. FIXME!!! */
- unsigned long size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size;
- MSYMBOL_SIZE(msym) = size;
+ elf_symbol_type *elf_sym;
+
+ /* NOTE: uweigand-20071112: A synthetic symbol does not have an
+ ELF-private part. However, in some cases (e.g. synthetic
+ 'dot' symbols on ppc64) the udata.p entry is set to point back
+ to the original ELF symbol it was derived from. Get the size
+ from that symbol. */
+ if (type != ST_SYNTHETIC)
+ elf_sym = (elf_symbol_type *) sym;
+ else
+ elf_sym = (elf_symbol_type *) sym->udata.p;
+
+ if (elf_sym)
+ MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size;
+
+ msym->filename = filesymname;
+ gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
+ }
+
+ /* For @plt symbols, also record a trampoline to the
+ destination symbol. The @plt symbol will be used in
+ disassembly, and the trampoline will be used when we are
+ trying to find the target. */
+ if (msym && ms_type == mst_text && type == ST_SYNTHETIC)
+ {
+ int len = strlen (sym->name);
+
+ if (len > 4 && strcmp (sym->name + len - 4, "@plt") == 0)
+ {
+ struct minimal_symbol *mtramp;
+
+ mtramp = record_minimal_symbol (sym->name, len - 4, 1,
+ symaddr,
+ mst_solib_trampoline,
+ sym->section, objfile);
+ if (mtramp)
+ {
+ MSYMBOL_SIZE (mtramp) = MSYMBOL_SIZE (msym);
+ mtramp->filename = filesymname;
+ gdbarch_elf_make_msymbol_special (gdbarch, sym, mtramp);
+ }
+ }
}
- if (msym != NULL)
- msym->filename = filesymname;
- gdbarch_elf_make_msymbol_special (current_gdbarch, sym, msym);
}
}
}
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
capability even for files compiled without -g. */
static void
-elf_symfile_read (struct objfile *objfile, int mainline)
+elf_symfile_read (struct objfile *objfile, int symfile_flags)
{
bfd *abfd = objfile->obfd;
struct elfinfo ei;
error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd),
bfd_errmsg (bfd_get_error ()));
- elf_symtab_read (objfile, 0, symcount, symbol_table);
+ elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0);
}
/* Add the dynamic symbols. */
error (_("Can't read symbols from %s: %s"), bfd_get_filename (objfile->obfd),
bfd_errmsg (bfd_get_error ()));
- elf_symtab_read (objfile, 1, dynsymcount, dyn_symbol_table);
+ elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0);
}
/* Add synthetic symbols - for instance, names for any PLT entries. */
for (i = 0; i < synthcount; i++)
synth_symbol_table[i] = synthsyms + i;
make_cleanup (xfree, synth_symbol_table);
- elf_symtab_read (objfile, 0, synthcount, synth_symbol_table);
+ elf_symtab_read (objfile, ST_SYNTHETIC, synthcount, synth_symbol_table, 1);
}
/* Install any minimal symbols that have been collected as the current
/* Now process debugging information, which is contained in
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, (void *) & ei);
/* FIXME should probably warn about a stab section without a stabstr. */
if (str_sect)
elfstab_build_psymtabs (objfile,
- mainline,
ei.stabsect,
str_sect->filepos,
bfd_section_size (abfd, str_sect));
if (dwarf2_has_info (objfile))
{
/* DWARF 2 sections */
- dwarf2_build_psymtabs (objfile, mainline);
+ dwarf2_build_psymtabs (objfile);
}
/* FIXME: kettenis/20030504: This still needs to be integrated with
dwarf2read.c in a better way. */
dwarf2_build_frame_info (objfile);
+
+ /* If the file has its own symbol tables it has no separate debug info.
+ `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to SYMTABS/PSYMTABS.
+ `.gnu_debuglink' may no longer be present with `.note.gnu.build-id'. */
+ if (!objfile_has_partial_symbols (objfile))
+ {
+ char *debugfile;
+
+ debugfile = find_separate_debug_file_by_buildid (objfile);
+
+ if (debugfile == NULL)
+ debugfile = find_separate_debug_file_by_debuglink (objfile);
+
+ if (debugfile)
+ {
+ bfd *abfd = symfile_bfd_open (debugfile);
+ symbol_file_add_separate (abfd, symfile_flags, objfile);
+ xfree (debugfile);
+ }
+ }
}
/* This cleans up the objfile's deprecated_sym_stab_info pointer, and