/* 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, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 1991-2012 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
#include "demangle.h"
#include "psympriv.h"
#include "filenames.h"
+#include "probe.h"
+#include "arch-utils.h"
#include "gdbtypes.h"
#include "value.h"
#include "infcall.h"
#include "gdbthread.h"
#include "regcache.h"
+#include "bcache.h"
extern void _initialize_elfread (void);
asection *mdebugsect; /* Section pointer for .mdebug section */
};
+/* Per-objfile data for probe info. */
+
+static const struct objfile_data *probe_key = NULL;
+
static void free_elfinfo (void *);
/* Minimal symbols located at the GOT entries for .plt - that is the real
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"),
+ warning (_("Loadable section \"%s\" outside of ELF segments"),
bfd_section_name (abfd, sect));
}
bfd_section, objfile);
}
-/*
-
- LOCAL FUNCTION
-
- elf_symtab_read -- read the symbol table of an ELF file
-
- SYNOPSIS
-
- void elf_symtab_read (struct objfile *objfile, int type,
- long number_of_symbols, asymbol **symbol_table)
-
- DESCRIPTION
+/* Read the symbol table of an ELF file.
Given an objfile, a symbol table, and a flag indicating whether the
symbol table contains regular, dynamic, or synthetic symbols, add all
defined in the ELF symbol table, which can be used to locate
the beginnings of sections from each ".o" file that was linked to
form the executable objfile. We gather any such info and record it
- in data structures hung off the objfile's private data.
-
- */
+ in data structures hung off the objfile's private data. */
#define ST_REGULAR 0
#define ST_DYNAMIC 1
seen any section info for it yet. */
asymbol *filesym = 0;
/* Name of filesym. This is either a constant string or is saved on
- the objfile's obstack. */
- char *filesymname = "";
+ the objfile's filename cache. */
+ const char *filesymname = "";
struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
int stripped = (bfd_get_symcount (objfile->obfd) == 0);
- struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
for (i = 0; i < number_of_symbols; i++)
{
{
struct minimal_symbol *msym;
bfd *abfd = objfile->obfd;
- asection *sect;
+ asection *sect;
/* Symbol is a reference to a function defined in
a shared library.
if (!sect)
continue;
+ /* On ia64-hpux, we have discovered that the system linker
+ adds undefined symbols with nonzero addresses that cannot
+ be right (their address points inside the code of another
+ function in the .text section). This creates problems
+ when trying to determine which symbol corresponds to
+ a given address.
+
+ We try to detect those buggy symbols by checking which
+ section we think they correspond to. Normally, PLT symbols
+ are stored inside their own section, and the typical name
+ for that section is ".plt". So, if there is a ".plt"
+ section, and yet the section name of our symbol does not
+ start with ".plt", we ignore that symbol. */
+ if (strncmp (sect->name, ".plt", 4) != 0
+ && bfd_get_section_by_name (abfd, ".plt") != NULL)
+ continue;
+
symaddr += ANOFFSET (objfile->section_offsets, sect->index);
msym = record_minimal_symbol
sectinfo = NULL;
}
filesym = sym;
- filesymname =
- obsavestring ((char *) filesym->name, strlen (filesym->name),
- &objfile->objfile_obstack);
+ filesymname = bcache (filesym->name, strlen (filesym->name) + 1,
+ objfile->filename_cache);
}
else if (sym->flags & BSF_SECTION_SYM)
continue;
NOTE: uweigand-20071112: Synthetic symbols do not
have an ELF-private part, so do not touch those. */
- unsigned int shndx = type == ST_SYNTHETIC ? 0 :
+ unsigned int shndx = type == ST_SYNTHETIC ? 0 :
((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
switch (shndx)
already includes one element, so we
need to allocate max_index aadditional
elements. */
- size = (sizeof (struct stab_section_info)
+ size = (sizeof (struct stab_section_info)
+ (sizeof (CORE_ADDR) * max_index));
sectinfo = (struct stab_section_info *)
xmalloc (size);
- make_cleanup (xfree, sectinfo);
memset (sectinfo, 0, size);
sectinfo->num_sections = max_index;
if (filesym == NULL)
else
{
/* FIXME: Solaris2 shared libraries include lots of
- odd "absolute" and "undefined" symbols, that play
+ odd "absolute" and "undefined" symbols, that play
hob with actions like finding what function the PC
is in. Ignore them if they aren't text, data, or bss. */
/* ms_type = mst_unknown; */
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. */
+ from that symbol. */
if (type != ST_SYNTHETIC)
elf_sym = (elf_symbol_type *) sym;
else
if (elf_sym)
MSYMBOL_SIZE(msym) = elf_sym->internal_elf_sym.st_size;
-
+
msym->filename = filesymname;
gdbarch_elf_make_msymbol_special (gdbarch, sym, msym);
}
}
}
}
- do_cleanups (back_to);
}
/* Build minimal symbols named `function@got.plt' (see SYMBOL_GOT_PLT_SUFFIX)
OBJFILE the symbol is undefined and the objfile having NAME defined
may not yet have been loaded. */
- if (string_buffer_size < name_len + got_suffix_len)
+ if (string_buffer_size < name_len + got_suffix_len + 1)
{
string_buffer_size = 2 * (name_len + got_suffix_len);
string_buffer = xrealloc (string_buffer, string_buffer_size);
}
memcpy (string_buffer, name, name_len);
memcpy (&string_buffer[name_len], SYMBOL_GOT_PLT_SUFFIX,
- got_suffix_len);
+ got_suffix_len + 1);
msym = record_minimal_symbol (string_buffer, name_len + got_suffix_len,
1, address, mst_slot_got_plt, got_plt,
{
if (elf_gnu_ifunc_resolve_by_cache (name, addr_p))
return 1;
-
+
if (elf_gnu_ifunc_resolve_by_got (name, addr_p))
return 1;
static CORE_ADDR
elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- char *name_at_pc;
+ const char *name_at_pc;
CORE_ADDR start_at_pc, address;
struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func;
struct value *function, *address_val;
prev_frame_id,
bp_gnu_ifunc_resolver_return);
+ /* set_momentary_breakpoint invalidates PREV_FRAME. */
+ prev_frame = NULL;
+
/* Add new b_return to the ring list b->related_breakpoint. */
gdb_assert (b_return->related_breakpoint == b_return);
b_return->related_breakpoint = b->related_breakpoint;
}
gdb_assert (b->type == bp_gnu_ifunc_resolver);
- gdb_assert (current_program_space == b->pspace);
+ gdb_assert (current_program_space == b->pspace || b->pspace == NULL);
elf_gnu_ifunc_record_cache (b->addr_string, resolved_pc);
sal = find_pc_line (resolved_pc, 0);
build_id_to_debug_filename (struct build_id *build_id)
{
char *link, *debugdir, *retval = NULL;
+ VEC (char_ptr) *debugdir_vec;
+ struct cleanup *back_to;
+ int ix;
/* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
/* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
cause "/.build-id/..." lookups. */
- debugdir = debug_file_directory;
- do
+ debugdir_vec = dirnames_to_char_ptr_vec (debug_file_directory);
+ back_to = make_cleanup_free_char_ptr_vec (debugdir_vec);
+
+ for (ix = 0; VEC_iterate (char_ptr, debugdir_vec, ix, debugdir); ++ix)
{
- char *s, *debugdir_end;
+ size_t debugdir_len = strlen (debugdir);
gdb_byte *data = build_id->data;
size_t size = build_id->size;
+ char *s;
- while (*debugdir == DIRNAME_SEPARATOR)
- debugdir++;
-
- debugdir_end = strchr (debugdir, DIRNAME_SEPARATOR);
- if (debugdir_end == NULL)
- debugdir_end = &debugdir[strlen (debugdir)];
-
- memcpy (link, debugdir, debugdir_end - debugdir);
- s = &link[debugdir_end - debugdir];
+ memcpy (link, debugdir, debugdir_len);
+ s = &link[debugdir_len];
s += sprintf (s, "/.build-id/");
if (size > 0)
{
if (retval != NULL)
break;
-
- debugdir = debugdir_end;
}
- while (*debugdir != 0);
+ do_cleanups (back_to);
return retval;
}
}
/* Scan and build partial symbols for a symbol file.
- We have been initialized by a call to elf_symfile_init, which
+ We have been initialized by a call to elf_symfile_init, which
currently does nothing.
SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
bfd_section_size (abfd, str_sect));
}
- if (dwarf2_has_info (objfile))
+ if (dwarf2_has_info (objfile, NULL))
{
/* elf_sym_fns_gdb_index cannot handle simultaneous non-DWARF debug
information present in OBJFILE. If there is such debug info present
static void
read_psyms (struct objfile *objfile)
{
- if (dwarf2_has_info (objfile))
+ if (dwarf2_has_info (objfile, NULL))
dwarf2_build_psymtabs (objfile);
}
/* Found it! Allocate a new psymtab struct, and fill it in. */
maybe->found++;
pst->section_offsets = (struct section_offsets *)
- obstack_alloc (&objfile->objfile_obstack,
+ obstack_alloc (&objfile->objfile_obstack,
SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
for (i = 0; i < maybe->num_sections; i++)
(pst->section_offsets)->offsets[i] = maybe->sections[i];
complaint (&symfile_complaints,
_("elf/stab section information missing for %s"), filename);
}
+
+/* Implementation of `sym_get_probes', as documented in symfile.h. */
+
+static VEC (probe_p) *
+elf_get_probes (struct objfile *objfile)
+{
+ VEC (probe_p) *probes_per_objfile;
+
+ /* Have we parsed this objfile's probes already? */
+ probes_per_objfile = objfile_data (objfile, probe_key);
+
+ if (!probes_per_objfile)
+ {
+ int ix;
+ const struct probe_ops *probe_ops;
+
+ /* Here we try to gather information about all types of probes from the
+ objfile. */
+ for (ix = 0; VEC_iterate (probe_ops_cp, all_probe_ops, ix, probe_ops);
+ ix++)
+ probe_ops->get_probes (&probes_per_objfile, objfile);
+
+ if (probes_per_objfile == NULL)
+ {
+ VEC_reserve (probe_p, probes_per_objfile, 1);
+ gdb_assert (probes_per_objfile != NULL);
+ }
+
+ set_objfile_data (objfile, probe_key, probes_per_objfile);
+ }
+
+ return probes_per_objfile;
+}
+
+/* Implementation of `sym_get_probe_argument_count', as documented in
+ symfile.h. */
+
+static unsigned
+elf_get_probe_argument_count (struct objfile *objfile,
+ struct probe *probe)
+{
+ return probe->pops->get_probe_argument_count (probe, objfile);
+}
+
+/* Implementation of `sym_evaluate_probe_argument', as documented in
+ symfile.h. */
+
+static struct value *
+elf_evaluate_probe_argument (struct objfile *objfile,
+ struct probe *probe,
+ unsigned n)
+{
+ return probe->pops->evaluate_probe_argument (probe, objfile, n);
+}
+
+/* Implementation of `sym_compile_to_ax', as documented in symfile.h. */
+
+static void
+elf_compile_to_ax (struct objfile *objfile,
+ struct probe *probe,
+ struct agent_expr *expr,
+ struct axs_value *value,
+ unsigned n)
+{
+ probe->pops->compile_to_ax (probe, objfile, expr, value, n);
+}
+
+/* Implementation of `sym_relocate_probe', as documented in symfile.h. */
+
+static void
+elf_symfile_relocate_probe (struct objfile *objfile,
+ struct section_offsets *new_offsets,
+ struct section_offsets *delta)
+{
+ int ix;
+ VEC (probe_p) *probes = objfile_data (objfile, probe_key);
+ struct probe *probe;
+
+ for (ix = 0; VEC_iterate (probe_p, probes, ix, probe); ix++)
+ probe->pops->relocate (probe, ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
+}
+
+/* Helper function used to free the space allocated for storing SystemTap
+ probe information. */
+
+static void
+probe_key_free (struct objfile *objfile, void *d)
+{
+ int ix;
+ VEC (probe_p) *probes = d;
+ struct probe *probe;
+
+ for (ix = 0; VEC_iterate (probe_p, probes, ix, probe); ix++)
+ probe->pops->destroy (probe);
+
+ VEC_free (probe_p, probes);
+}
+
\f
+
+/* Implementation `sym_probe_fns', as documented in symfile.h. */
+
+static const struct sym_probe_fns elf_probe_fns =
+{
+ elf_get_probes, /* sym_get_probes */
+ elf_get_probe_argument_count, /* sym_get_probe_argument_count */
+ elf_evaluate_probe_argument, /* sym_evaluate_probe_argument */
+ elf_compile_to_ax, /* sym_compile_to_ax */
+ elf_symfile_relocate_probe, /* sym_relocate_probe */
+};
+
/* Register that we are able to handle ELF object file formats. */
static const struct sym_fns elf_sym_fns =
elf_symfile_segments, /* Get segment information from a file. */
NULL,
default_symfile_relocate, /* Relocate a debug section. */
+ &elf_probe_fns, /* sym_probe_fns */
&psym_functions
};
elf_symfile_segments, /* Get segment information from a file. */
NULL,
default_symfile_relocate, /* Relocate a debug section. */
+ &elf_probe_fns, /* sym_probe_fns */
&psym_functions
};
elf_symfile_segments, /* Get segment information from a file. */
NULL,
default_symfile_relocate, /* Relocate a debug section. */
+ &elf_probe_fns, /* sym_probe_fns */
&dwarf2_gdb_index_functions
};
void
_initialize_elfread (void)
{
+ probe_key = register_objfile_data_with_cleanup (NULL, probe_key_free);
add_symtab_fns (&elf_sym_fns);
elf_objfile_gnu_ifunc_cache_data = register_objfile_data ();
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