/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 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.
Written by Fred Fish at Cygnus Support.
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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "bfd.h"
#include "gdb_string.h"
#include "elf-bfd.h"
+#include "elf/common.h"
+#include "elf/internal.h"
#include "elf/mips.h"
#include "symtab.h"
#include "symfile.h"
#include "gdb-stabs.h"
#include "complaints.h"
#include "demangle.h"
+#include "psympriv.h"
extern void _initialize_elfread (void);
+/* Forward declaration. */
+static const struct sym_fns elf_sym_fns_gdb_index;
+
/* The struct elfinfo is available only during ELF symbol table and
psymtab reading. It is destroyed at the completion of psymtab-reading.
It's local to elf_symfile_read. */
struct elfinfo
{
- file_ptr dboffset; /* Offset to dwarf debug section */
- unsigned int dbsize; /* Size of dwarf debug section */
- file_ptr lnoffset; /* Offset to dwarf line number section */
- 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 */
static void free_elfinfo (void *);
+/* Locate the segments in ABFD. */
+
+static struct symfile_segment_data *
+elf_symfile_segments (bfd *abfd)
+{
+ Elf_Internal_Phdr *phdrs, **segments;
+ long phdrs_size;
+ int num_phdrs, num_segments, num_sections, i;
+ asection *sect;
+ struct symfile_segment_data *data;
+
+ phdrs_size = bfd_get_elf_phdr_upper_bound (abfd);
+ if (phdrs_size == -1)
+ return NULL;
+
+ phdrs = alloca (phdrs_size);
+ num_phdrs = bfd_get_elf_phdrs (abfd, phdrs);
+ if (num_phdrs == -1)
+ return NULL;
+
+ num_segments = 0;
+ segments = alloca (sizeof (Elf_Internal_Phdr *) * num_phdrs);
+ for (i = 0; i < num_phdrs; i++)
+ if (phdrs[i].p_type == PT_LOAD)
+ segments[num_segments++] = &phdrs[i];
+
+ if (num_segments == 0)
+ return NULL;
+
+ data = XZALLOC (struct symfile_segment_data);
+ data->num_segments = num_segments;
+ data->segment_bases = XCALLOC (num_segments, CORE_ADDR);
+ data->segment_sizes = XCALLOC (num_segments, CORE_ADDR);
+
+ for (i = 0; i < num_segments; i++)
+ {
+ data->segment_bases[i] = segments[i]->p_vaddr;
+ data->segment_sizes[i] = segments[i]->p_memsz;
+ }
+
+ num_sections = bfd_count_sections (abfd);
+ data->segment_info = XCALLOC (num_sections, int);
+
+ for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
+ {
+ int j;
+ CORE_ADDR vma;
+
+ if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
+ continue;
+
+ vma = bfd_get_section_vma (abfd, sect);
+
+ 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)
+ {
+ data->segment_info[i] = j + 1;
+ break;
+ }
+
+ /* 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));
+ }
+
+ return data;
+}
+
/* We are called once per section from elf_symfile_read. We
need to examine each section we are passed, check to see
if it is something we are interested in processing, and
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
+ section flags to specify what kind of debug section it is.
-kingdon). */
static void
struct elfinfo *ei;
ei = (struct elfinfo *) eip;
- if (strcmp (sectp->name, ".debug") == 0)
- {
- ei->dboffset = sectp->filepos;
- ei->dbsize = bfd_get_section_size (sectp);
- }
- else if (strcmp (sectp->name, ".line") == 0)
- {
- ei->lnoffset = sectp->filepos;
- ei->lnsize = bfd_get_section_size (sectp);
- }
- else if (strcmp (sectp->name, ".stab") == 0)
+ if (strcmp (sectp->name, ".stab") == 0)
{
ei->stabsect = sectp;
}
}
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 = SMASH_TEXT_ADDRESS (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 and a flag that specifies whether or not the objfile
- 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.
+ Given an objfile, a symbol table, and a flag indicating whether the
+ 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)
+elf_symtab_read (struct objfile *objfile, int type,
+ long number_of_symbols, asymbol **symbol_table,
+ int copy_names)
{
- long storage_needed;
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
asymbol *sym;
- asymbol **symbol_table;
- long number_of_symbols;
long i;
- struct cleanup *back_to;
CORE_ADDR symaddr;
CORE_ADDR offset;
enum minimal_symbol_type ms_type;
/* If filesym is nonzero, it points to a file symbol, but we haven't
seen any section info for it yet. */
asymbol *filesym = 0;
-#ifdef SOFUN_ADDRESS_MAYBE_MISSING
- /* Name of filesym, as saved on the objfile_obstack. */
- char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack);
-#endif
- struct dbx_symfile_info *dbx = objfile->sym_stab_info;
+ /* 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);
- if (dynamic)
+ for (i = 0; i < number_of_symbols; i++)
{
- storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd);
+ sym = symbol_table[i];
+ if (sym->name == NULL || *sym->name == '\0')
+ {
+ /* Skip names that don't exist (shouldn't happen), or names
+ that are null strings (may happen). */
+ continue;
+ }
- /* Nothing to be done if there is no dynamic symtab. */
- if (storage_needed < 0)
- return;
- }
- else
- {
- storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
- if (storage_needed < 0)
- error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd),
- bfd_errmsg (bfd_get_error ()));
- }
- if (storage_needed > 0)
- {
- symbol_table = (asymbol **) xmalloc (storage_needed);
- back_to = make_cleanup (xfree, symbol_table);
- if (dynamic)
- number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd,
- symbol_table);
- else
- number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
- if (number_of_symbols < 0)
- error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd),
- bfd_errmsg (bfd_get_error ()));
+ /* Skip "special" symbols, e.g. ARM mapping symbols. These are
+ 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))
+ {
+ if (gdbarch_record_special_symbol_p (gdbarch))
+ gdbarch_record_special_symbol (gdbarch, objfile, sym);
+ continue;
+ }
- for (i = 0; i < number_of_symbols; i++)
+ offset = ANOFFSET (objfile->section_offsets, sym->section->index);
+ if (type == ST_DYNAMIC
+ && sym->section == &bfd_und_section
+ && (sym->flags & BSF_FUNCTION))
{
- sym = symbol_table[i];
- if (sym->name == NULL || *sym->name == '\0')
+ struct minimal_symbol *msym;
+ bfd *abfd = objfile->obfd;
+ asection *sect;
+
+ /* 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,
+ plus the desired section offset.
+ 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;
+
+ /* 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)
{
- /* Skip names that don't exist (shouldn't happen), or names
- that are null strings (may happen). */
- continue;
+ 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);
- offset = ANOFFSET (objfile->section_offsets, sym->section->index);
- if (dynamic
- && sym->section == &bfd_und_section
- && (sym->flags & BSF_FUNCTION))
+ msym = record_minimal_symbol
+ (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 (type == ST_DYNAMIC && !stripped)
+ continue;
+ if (sym->flags & BSF_FILE)
+ {
+ /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
+ Chain any old one onto the objfile; remember new sym. */
+ if (sectinfo != NULL)
+ {
+ sectinfo->next = dbx->stab_section_info;
+ dbx->stab_section_info = sectinfo;
+ sectinfo = NULL;
+ }
+ filesym = sym;
+ filesymname =
+ obsavestring ((char *) filesym->name, strlen (filesym->name),
+ &objfile->objfile_obstack);
+ }
+ else if (sym->flags & BSF_SECTION_SYM)
+ continue;
+ 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. */
+ /* Bfd symbols are section relative. */
+ symaddr = sym->value + sym->section->vma;
+ /* Relocate all non-absolute and non-TLS symbols by the
+ section offset. */
+ if (sym->section != &bfd_abs_section
+ && !(sym->section->flags & SEC_THREAD_LOCAL))
{
- 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,
- plus the desired section offset.
- 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 += offset;
- msym = record_minimal_symbol
- ((char *) sym->name, symaddr,
- mst_solib_trampoline, 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)
+ /* 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)
{
- /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
- Chain any old one onto the objfile; remember new sym. */
- if (sectinfo != NULL)
+ /* 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.
+
+ 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)
{
- sectinfo->next = dbx->stab_section_info;
- dbx->stab_section_info = sectinfo;
- sectinfo = NULL;
+ 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 by section offset. */
+ if (ms_type != mst_abs)
+ {
+ if (sym->name[0] == '.')
+ continue;
+ symaddr += offset;
}
- filesym = sym;
-#ifdef SOFUN_ADDRESS_MAYBE_MISSING
- filesymname =
- obsavestring ((char *) filesym->name, strlen (filesym->name),
- &objfile->objfile_obstack);
-#endif
}
- else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
+ else if (sym->section->flags & SEC_CODE)
{
- 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. */
- /* 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)
+ if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
{
- symaddr += offset;
+ ms_type = mst_text;
}
- /* 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)
+ else if ((sym->name[0] == '.' && sym->name[1] == 'L')
+ || ((sym->flags & BSF_LOCAL)
+ && sym->name[0] == '$'
+ && sym->name[1] == 'L'))
+ /* Looks like a compiler-generated label. Skip
+ it. The assembler should be skipping these (to
+ keep executables small), but apparently with
+ gcc on the (deleted) delta m88k SVR4, it loses.
+ So to have us check too should be harmless (but
+ I encourage people to fix this in the assembler
+ instead of adding checks here). */
+ continue;
+ else
{
- /* This is a hack to get the minimal symbol type
- right for Irix 5, which has absolute addresses
- with special section indices for dynamic symbols. */
- unsigned short shndx =
- ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
-
- switch (shndx)
- {
- case SHN_MIPS_TEXT:
- ms_type = mst_text;
- break;
- case SHN_MIPS_DATA:
- ms_type = mst_data;
- break;
- case SHN_MIPS_ACOMMON:
- ms_type = mst_bss;
- break;
- default:
- ms_type = mst_abs;
- }
-
- /* If it is an Irix dynamic symbol, skip section name
- symbols, relocate all others by section offset. */
- if (ms_type != mst_abs)
- {
- if (sym->name[0] == '.')
- continue;
- symaddr += offset;
- }
+ ms_type = mst_file_text;
}
- else if (sym->section->flags & SEC_CODE)
+ }
+ else if (sym->section->flags & SEC_ALLOC)
+ {
+ if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
{
- if (sym->flags & BSF_GLOBAL)
+ if (sym->section->flags & SEC_LOAD)
{
- ms_type = mst_text;
+ ms_type = mst_data;
}
- else if ((sym->name[0] == '.' && sym->name[1] == 'L')
- || ((sym->flags & BSF_LOCAL)
- && sym->name[0] == '$'
- && 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 (deleted) delta m88k SVR4, it loses.
- So to have us check too should be harmless (but
- I encourage people to fix this in the assembler
- instead of adding checks here). */
- continue;
else
{
- ms_type = mst_file_text;
+ ms_type = mst_bss;
}
}
- else if (sym->section->flags & SEC_ALLOC)
+ else if (sym->flags & BSF_LOCAL)
{
- if (sym->flags & (BSF_GLOBAL | BSF_WEAK))
- {
- if (sym->section->flags & SEC_LOAD)
- {
- ms_type = mst_data;
- }
- else
- {
- ms_type = mst_bss;
- }
- }
- else if (sym->flags & BSF_LOCAL)
+ /* Named Local variable in a Data section.
+ Check its name for stabs-in-elf. */
+ int special_local_sect;
+
+ if (strcmp ("Bbss.bss", sym->name) == 0)
+ special_local_sect = SECT_OFF_BSS (objfile);
+ else if (strcmp ("Ddata.data", sym->name) == 0)
+ special_local_sect = SECT_OFF_DATA (objfile);
+ else if (strcmp ("Drodata.rodata", sym->name) == 0)
+ special_local_sect = SECT_OFF_RODATA (objfile);
+ else
+ special_local_sect = -1;
+ if (special_local_sect >= 0)
{
- /* Named Local variable in a Data section.
- Check its name for stabs-in-elf. */
- int special_local_sect;
- if (strcmp ("Bbss.bss", sym->name) == 0)
- special_local_sect = SECT_OFF_BSS (objfile);
- else if (strcmp ("Ddata.data", sym->name) == 0)
- special_local_sect = SECT_OFF_DATA (objfile);
- else if (strcmp ("Drodata.rodata", sym->name) == 0)
- special_local_sect = SECT_OFF_RODATA (objfile);
- else
- special_local_sect = -1;
- if (special_local_sect >= 0)
+ /* Found a special local symbol. Allocate a
+ sectinfo, if needed, and fill it in. */
+ if (sectinfo == NULL)
{
- /* Found a special local symbol. Allocate a
- sectinfo, if needed, and fill it in. */
- if (sectinfo == NULL)
+ int max_index;
+ size_t size;
+
+ 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
+ allocate max_index+1 elements for it.
+ However, 'struct stab_section_info'
+ already includes one element, so we
+ need to allocate max_index aadditional
+ elements. */
+ size = (sizeof (struct stab_section_info)
+ + (sizeof (CORE_ADDR)
+ * max_index));
+ sectinfo = (struct stab_section_info *)
+ xmalloc (size);
+ memset (sectinfo, 0, size);
+ sectinfo->num_sections = max_index;
+ if (filesym == NULL)
{
- int max_index;
- size_t size;
-
- max_index
- = max (SECT_OFF_BSS (objfile),
- max (SECT_OFF_DATA (objfile),
- SECT_OFF_RODATA (objfile)));
-
- /* max_index is the largest index we'll
- use into this array, so we must
- allocate max_index+1 elements for it.
- However, 'struct stab_section_info'
- already includes one element, so we
- need to allocate max_index aadditional
- elements. */
- size = (sizeof (struct stab_section_info)
- + (sizeof (CORE_ADDR)
- * max_index));
- sectinfo = (struct stab_section_info *)
- xmalloc (size);
- memset (sectinfo, 0, size);
- sectinfo->num_sections = max_index;
- if (filesym == NULL)
- {
- complaint (&symfile_complaints,
- "elf/stab section information %s without a preceding file symbol",
- sym->name);
- }
- else
- {
- sectinfo->filename =
- (char *) filesym->name;
- }
+ complaint (&symfile_complaints,
+ _("elf/stab section information %s "
+ "without a preceding file symbol"),
+ sym->name);
+ }
+ else
+ {
+ sectinfo->filename =
+ (char *) filesym->name;
}
- if (sectinfo->sections[special_local_sect] != 0)
- complaint (&symfile_complaints,
- "duplicated elf/stab section information for %s",
- sectinfo->filename);
- /* BFD symbols are section relative. */
- symaddr = sym->value + sym->section->vma;
- /* Relocate non-absolute symbols by the
- section offset. */
- if (sym->section != &bfd_abs_section)
- symaddr += offset;
- sectinfo->sections[special_local_sect] = symaddr;
- /* The special local symbols don't go in the
- minimal symbol table, so ignore this one. */
- continue;
- }
- /* Not a special stabs-in-elf symbol, do regular
- symbol processing. */
- if (sym->section->flags & SEC_LOAD)
- {
- ms_type = mst_file_data;
- }
- else
- {
- ms_type = mst_file_bss;
}
+ if (sectinfo->sections[special_local_sect] != 0)
+ complaint (&symfile_complaints,
+ _("duplicated elf/stab section "
+ "information for %s"),
+ sectinfo->filename);
+ /* BFD symbols are section relative. */
+ symaddr = sym->value + sym->section->vma;
+ /* Relocate non-absolute symbols by the
+ section offset. */
+ if (sym->section != &bfd_abs_section)
+ symaddr += offset;
+ sectinfo->sections[special_local_sect] = symaddr;
+ /* The special local symbols don't go in the
+ minimal symbol table, so ignore this one. */
+ continue;
+ }
+ /* Not a special stabs-in-elf symbol, do regular
+ symbol processing. */
+ if (sym->section->flags & SEC_LOAD)
+ {
+ ms_type = mst_file_data;
}
else
{
- ms_type = mst_unknown;
+ ms_type = mst_file_bss;
}
}
else
{
- /* FIXME: Solaris2 shared libraries include lots of
- 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; */
- continue; /* Skip this symbol. */
+ ms_type = mst_unknown;
+ }
+ }
+ else
+ {
+ /* FIXME: Solaris2 shared libraries include lots of
+ 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; */
+ continue; /* Skip this symbol. */
+ }
+ msym = record_minimal_symbol
+ (sym->name, strlen (sym->name), copy_names, symaddr,
+ ms_type, sym->section, objfile);
+
+ if (msym)
+ {
+ /* Pass symbol size field in via BFD. FIXME!!! */
+ 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);
+ }
}
- msym = record_minimal_symbol
- ((char *) sym->name, 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;
- }
-#ifdef SOFUN_ADDRESS_MAYBE_MISSING
- if (msym != NULL)
- msym->filename = filesymname;
-#endif
- ELF_MAKE_MSYMBOL_SPECIAL (sym, msym);
}
}
- do_cleanups (back_to);
}
}
+struct build_id
+ {
+ size_t size;
+ gdb_byte data[1];
+ };
+
+/* Locate NT_GNU_BUILD_ID from ABFD and return its content. */
+
+static struct build_id *
+build_id_bfd_get (bfd *abfd)
+{
+ struct build_id *retval;
+
+ if (!bfd_check_format (abfd, bfd_object)
+ || bfd_get_flavour (abfd) != bfd_target_elf_flavour
+ || elf_tdata (abfd)->build_id == NULL)
+ return NULL;
+
+ retval = xmalloc (sizeof *retval - 1 + elf_tdata (abfd)->build_id_size);
+ retval->size = elf_tdata (abfd)->build_id_size;
+ memcpy (retval->data, elf_tdata (abfd)->build_id, retval->size);
+
+ return retval;
+}
+
+/* Return if FILENAME has NT_GNU_BUILD_ID matching the CHECK value. */
+
+static int
+build_id_verify (const char *filename, struct build_id *check)
+{
+ bfd *abfd;
+ struct build_id *found = NULL;
+ int retval = 0;
+
+ /* We expect to be silent on the non-existing files. */
+ abfd = bfd_open_maybe_remote (filename);
+ if (abfd == NULL)
+ return 0;
+
+ found = build_id_bfd_get (abfd);
+
+ if (found == NULL)
+ warning (_("File \"%s\" has no build-id, file skipped"), filename);
+ else if (found->size != check->size
+ || memcmp (found->data, check->data, found->size) != 0)
+ warning (_("File \"%s\" has a different build-id, file skipped"),
+ filename);
+ else
+ retval = 1;
+
+ gdb_bfd_close_or_warn (abfd);
+
+ xfree (found);
+
+ return retval;
+}
+
+static char *
+build_id_to_debug_filename (struct build_id *build_id)
+{
+ char *link, *debugdir, *retval = NULL;
+
+ /* DEBUG_FILE_DIRECTORY/.build-id/ab/cdef */
+ link = alloca (strlen (debug_file_directory) + (sizeof "/.build-id/" - 1) + 1
+ + 2 * build_id->size + (sizeof ".debug" - 1) + 1);
+
+ /* Keep backward compatibility so that DEBUG_FILE_DIRECTORY being "" will
+ cause "/.build-id/..." lookups. */
+
+ debugdir = debug_file_directory;
+ do
+ {
+ char *s, *debugdir_end;
+ gdb_byte *data = build_id->data;
+ size_t size = build_id->size;
+
+ 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];
+ s += sprintf (s, "/.build-id/");
+ if (size > 0)
+ {
+ size--;
+ s += sprintf (s, "%02x", (unsigned) *data++);
+ }
+ if (size > 0)
+ *s++ = '/';
+ while (size-- > 0)
+ s += sprintf (s, "%02x", (unsigned) *data++);
+ strcpy (s, ".debug");
+
+ /* lrealpath() is expensive even for the usually non-existent files. */
+ if (access (link, F_OK) == 0)
+ retval = lrealpath (link);
+
+ if (retval != NULL && !build_id_verify (retval, build_id))
+ {
+ xfree (retval);
+ retval = NULL;
+ }
+
+ if (retval != NULL)
+ break;
+
+ debugdir = debugdir_end;
+ }
+ while (*debugdir != 0);
+
+ return retval;
+}
+
+static char *
+find_separate_debug_file_by_buildid (struct objfile *objfile)
+{
+ struct build_id *build_id;
+
+ build_id = build_id_bfd_get (objfile->obfd);
+ if (build_id != NULL)
+ {
+ char *build_id_name;
+
+ build_id_name = build_id_to_debug_filename (build_id);
+ xfree (build_id);
+ /* Prevent looping on a stripped .debug file. */
+ if (build_id_name != NULL && strcmp (build_id_name, objfile->name) == 0)
+ {
+ warning (_("\"%s\": separate debug info file has no debug info"),
+ build_id_name);
+ xfree (build_id_name);
+ }
+ else if (build_id_name != NULL)
+ return build_id_name;
+ }
+ return NULL;
+}
+
/* Scan and build partial symbols for a symbol file.
We have been initialized by a call to elf_symfile_init, which
currently does nothing.
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
We look for sections with specific names, to tell us what debug
format to look for: FIXME!!!
- dwarf_build_psymtabs() builds psymtabs for DWARF symbols;
elfstab_build_psymtabs() handles STABS symbols;
mdebug_build_psymtabs() handles ECOFF debugging information.
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;
struct cleanup *back_to;
- CORE_ADDR offset;
+ long symcount = 0, dynsymcount = 0, synthcount, storage_needed;
+ asymbol **symbol_table = NULL, **dyn_symbol_table = NULL;
+ asymbol *synthsyms;
init_minimal_symbol_collection ();
back_to = make_cleanup_discard_minimal_symbols ();
memset ((char *) &ei, 0, sizeof (ei));
- /* Allocate struct to keep track of the symfile */
- objfile->sym_stab_info = (struct dbx_symfile_info *)
+ /* Allocate struct to keep track of the symfile. */
+ objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *)
xmalloc (sizeof (struct dbx_symfile_info));
- memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
+ memset ((char *) objfile->deprecated_sym_stab_info,
+ 0, sizeof (struct dbx_symfile_info));
make_cleanup (free_elfinfo, (void *) objfile);
- /* Process the normal ELF symbol table first. This may write some
- chain of info into the dbx_symfile_info in objfile->sym_stab_info,
- which can later be used by elfstab_offset_sections. */
+ /* Process the normal ELF symbol table first. This may write some
+ chain of info into the dbx_symfile_info in
+ objfile->deprecated_sym_stab_info, which can later be used by
+ elfstab_offset_sections. */
+
+ storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
+ if (storage_needed < 0)
+ error (_("Can't read symbols from %s: %s"),
+ bfd_get_filename (objfile->obfd),
+ bfd_errmsg (bfd_get_error ()));
+
+ if (storage_needed > 0)
+ {
+ symbol_table = (asymbol **) xmalloc (storage_needed);
+ make_cleanup (xfree, symbol_table);
+ symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table);
- elf_symtab_read (objfile, 0);
+ if (symcount < 0)
+ error (_("Can't read symbols from %s: %s"),
+ bfd_get_filename (objfile->obfd),
+ bfd_errmsg (bfd_get_error ()));
+
+ elf_symtab_read (objfile, ST_REGULAR, symcount, symbol_table, 0);
+ }
/* Add the dynamic symbols. */
- elf_symtab_read (objfile, 1);
+ storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd);
+
+ if (storage_needed > 0)
+ {
+ /* Memory gets permanently referenced from ABFD after
+ bfd_get_synthetic_symtab so it must not get freed before ABFD gets.
+ It happens only in the case when elf_slurp_reloc_table sees
+ asection->relocation NULL. Determining which section is asection is
+ done by _bfd_elf_get_synthetic_symtab which is all a bfd
+ implementation detail, though. */
+
+ dyn_symbol_table = bfd_alloc (abfd, storage_needed);
+ dynsymcount = bfd_canonicalize_dynamic_symtab (objfile->obfd,
+ dyn_symbol_table);
+
+ if (dynsymcount < 0)
+ error (_("Can't read symbols from %s: %s"),
+ bfd_get_filename (objfile->obfd),
+ bfd_errmsg (bfd_get_error ()));
+
+ elf_symtab_read (objfile, ST_DYNAMIC, dynsymcount, dyn_symbol_table, 0);
+ }
+
+ /* Add synthetic symbols - for instance, names for any PLT entries. */
+
+ synthcount = bfd_get_synthetic_symtab (abfd, symcount, symbol_table,
+ dynsymcount, dyn_symbol_table,
+ &synthsyms);
+ if (synthcount > 0)
+ {
+ asymbol **synth_symbol_table;
+ long i;
+
+ make_cleanup (xfree, synthsyms);
+ synth_symbol_table = xmalloc (sizeof (asymbol *) * synthcount);
+ for (i = 0; i < synthcount; i++)
+ synth_symbol_table[i] = synthsyms + i;
+ make_cleanup (xfree, 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
minimal symbols for this objfile. The debug readers below this point
do_cleanups (back_to);
/* 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;
- }
+ special ELF sections. */
- /* We first have to find them... */
+ /* We first have to find them... */
bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei);
/* ELF debugging information is inserted into the psymtab in the
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. */
+ an included file XCOFF info is useless. */
if (ei.mdebugsect)
{
/* 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);
- }
- else if (ei.dboffset && ei.lnoffset)
+
+ if (dwarf2_has_info (objfile) && dwarf2_initialize_objfile (objfile))
+ objfile->sf = &elf_sym_fns_gdb_index;
+
+ /* 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))
{
- /* DWARF sections */
- dwarf_build_psymtabs (objfile,
- mainline,
- ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize);
- }
+ char *debugfile;
- /* FIXME: kettenis/20030504: This still needs to be integrated with
- dwarf2read.c in a better way. */
- dwarf2_build_frame_info (objfile);
+ 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 sym_stab_info pointer, and the chain of
- stab_section_info's, that might be dangling from it. */
+/* This cleans up the objfile's deprecated_sym_stab_info pointer, and
+ the chain of stab_section_info's, that might be dangling from
+ it. */
static void
free_elfinfo (void *objp)
{
struct objfile *objfile = (struct objfile *) objp;
- struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info;
+ struct dbx_symfile_info *dbxinfo = objfile->deprecated_sym_stab_info;
struct stab_section_info *ssi, *nssi;
ssi = dbxinfo->stab_section_info;
while (ssi)
{
nssi = ssi->next;
- xmfree (objfile->md, ssi);
+ xfree (ssi);
ssi = nssi;
}
file is specified (not just adding some symbols from another file, e.g. a
shared library).
- We reinitialize buildsym, since we may be reading stabs from an ELF file. */
+ We reinitialize buildsym, since we may be reading stabs from an ELF
+ file. */
static void
elf_new_init (struct objfile *ignore)
/* 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. */
+ objfile struct from the global list of known objfiles. */
static void
elf_symfile_finish (struct objfile *objfile)
{
- if (objfile->sym_stab_info != NULL)
+ if (objfile->deprecated_sym_stab_info != NULL)
{
- xmfree (objfile->md, objfile->sym_stab_info);
+ xfree (objfile->deprecated_sym_stab_info);
}
+
+ dwarf2_free_objfile (objfile);
}
/* ELF specific initialization routine for reading symbols.
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. */
+ just a stub. */
static void
elf_symfile_init (struct objfile *objfile)
void
elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst)
{
- char *filename = pst->filename;
- struct dbx_symfile_info *dbx = objfile->sym_stab_info;
+ const char *filename = pst->filename;
+ struct dbx_symfile_info *dbx = objfile->deprecated_sym_stab_info;
struct stab_section_info *maybe = dbx->stab_section_info;
struct stab_section_info *questionable = 0;
int i;
/* FIXME: This linear search could speed up significantly
if it was chained in the right order to match how we search it,
- and if we unchained when we found a match. */
+ and if we unchained when we found a match. */
for (; maybe; maybe = maybe->next)
{
if (filename[0] == maybe->filename[0]
if (maybe == 0 && questionable != 0)
{
complaint (&symfile_complaints,
- "elf/stab section information questionable for %s", filename);
+ _("elf/stab section information questionable for %s"),
+ filename);
maybe = questionable;
}
/* We were unable to find any offsets for this file. Complain. */
if (dbx->stab_section_info) /* If there *is* any info, */
complaint (&symfile_complaints,
- "elf/stab section information missing for %s", filename);
+ _("elf/stab section information missing for %s"), filename);
}
\f
/* Register that we are able to handle ELF object file formats. */
-static struct sym_fns elf_sym_fns =
+static const struct sym_fns elf_sym_fns =
+{
+ bfd_target_elf_flavour,
+ elf_new_init, /* init anything gbl to entire symtab */
+ elf_symfile_init, /* read initial info, setup for sym_read() */
+ elf_symfile_read, /* read a symbol file into symtab */
+ elf_symfile_finish, /* finished with file, cleanup */
+ default_symfile_offsets, /* Translate ext. to int. relocation */
+ elf_symfile_segments, /* Get segment information from a file. */
+ NULL,
+ default_symfile_relocate, /* Relocate a debug section. */
+ &psym_functions
+};
+
+/* The same as elf_sym_fns, but not registered and uses the
+ DWARF-specific GNU index rather than psymtab. */
+static const struct sym_fns elf_sym_fns_gdb_index =
{
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 */
- default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
- NULL /* next: pointer to next struct sym_fns */
+ elf_new_init, /* init anything gbl to entire symab */
+ elf_symfile_init, /* read initial info, setup for sym_red() */
+ elf_symfile_read, /* read a symbol file into symtab */
+ elf_symfile_finish, /* finished with file, cleanup */
+ default_symfile_offsets, /* Translate ext. to int. relocatin */
+ elf_symfile_segments, /* Get segment information from a file. */
+ NULL,
+ default_symfile_relocate, /* Relocate a debug section. */
+ &dwarf2_gdb_index_functions
};
void