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symfile.c
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/* Generic symbol file reading for the GNU debugger, GDB.
Copyright (C) 1990-2015 Free Software Foundation, Inc.
Contributed by Cygnus Support, using pieces from other GDB modules.
This file is part of GDB.
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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "bfdlink.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "frame.h"
#include "target.h"
#include "value.h"
#include "symfile.h"
#include "objfiles.h"
#include "source.h"
#include "gdbcmd.h"
#include "breakpoint.h"
#include "language.h"
#include "complaints.h"
#include "demangle.h"
#include "inferior.h"
#include "regcache.h"
#include "filenames.h" /* for DOSish file names */
#include "gdb-stabs.h"
#include "gdb_obstack.h"
#include "completer.h"
#include "bcache.h"
#include "hashtab.h"
#include "readline/readline.h"
#include "block.h"
#include "observer.h"
#include "exec.h"
#include "parser-defs.h"
#include "varobj.h"
#include "elf-bfd.h"
#include "solib.h"
#include "remote.h"
#include "stack.h"
#include "gdb_bfd.h"
#include "cli/cli-utils.h"
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <time.h>
#include "gdb_sys_time.h"
#include "psymtab.h"
int (*deprecated_ui_load_progress_hook) (const char *section,
unsigned long num);
void (*deprecated_show_load_progress) (const char *section,
unsigned long section_sent,
unsigned long section_size,
unsigned long total_sent,
unsigned long total_size);
void (*deprecated_pre_add_symbol_hook) (const char *);
void (*deprecated_post_add_symbol_hook) (void);
static void clear_symtab_users_cleanup (void *ignore);
/* Global variables owned by this file. */
int readnow_symbol_files; /* Read full symbols immediately. */
/* Functions this file defines. */
static void load_command (char *, int);
static void symbol_file_add_main_1 (const char *args, int from_tty, int flags);
static void add_symbol_file_command (char *, int);
static const struct sym_fns *find_sym_fns (bfd *);
static void decrement_reading_symtab (void *);
static void overlay_invalidate_all (void);
static void overlay_auto_command (char *, int);
static void overlay_manual_command (char *, int);
static void overlay_off_command (char *, int);
static void overlay_load_command (char *, int);
static void overlay_command (char *, int);
static void simple_free_overlay_table (void);
static void read_target_long_array (CORE_ADDR, unsigned int *, int, int,
enum bfd_endian);
static int simple_read_overlay_table (void);
static int simple_overlay_update_1 (struct obj_section *);
static void add_filename_language (char *ext, enum language lang);
static void info_ext_lang_command (char *args, int from_tty);
static void init_filename_language_table (void);
static void symfile_find_segment_sections (struct objfile *objfile);
void _initialize_symfile (void);
/* List of all available sym_fns. On gdb startup, each object file reader
calls add_symtab_fns() to register information on each format it is
prepared to read. */
typedef struct
{
/* BFD flavour that we handle. */
enum bfd_flavour sym_flavour;
/* The "vtable" of symbol functions. */
const struct sym_fns *sym_fns;
} registered_sym_fns;
DEF_VEC_O (registered_sym_fns);
static VEC (registered_sym_fns) *symtab_fns = NULL;
/* Values for "set print symbol-loading". */
const char print_symbol_loading_off[] = "off";
const char print_symbol_loading_brief[] = "brief";
const char print_symbol_loading_full[] = "full";
static const char *print_symbol_loading_enums[] =
{
print_symbol_loading_off,
print_symbol_loading_brief,
print_symbol_loading_full,
NULL
};
static const char *print_symbol_loading = print_symbol_loading_full;
/* If non-zero, shared library symbols will be added automatically
when the inferior is created, new libraries are loaded, or when
attaching to the inferior. This is almost always what users will
want to have happen; but for very large programs, the startup time
will be excessive, and so if this is a problem, the user can clear
this flag and then add the shared library symbols as needed. Note
that there is a potential for confusion, since if the shared
library symbols are not loaded, commands like "info fun" will *not*
report all the functions that are actually present. */
int auto_solib_add = 1;
/* Return non-zero if symbol-loading messages should be printed.
FROM_TTY is the standard from_tty argument to gdb commands.
If EXEC is non-zero the messages are for the executable.
Otherwise, messages are for shared libraries.
If FULL is non-zero then the caller is printing a detailed message.
E.g., the message includes the shared library name.
Otherwise, the caller is printing a brief "summary" message. */
int
print_symbol_loading_p (int from_tty, int exec, int full)
{
if (!from_tty && !info_verbose)
return 0;
if (exec)
{
/* We don't check FULL for executables, there are few such
messages, therefore brief == full. */
return print_symbol_loading != print_symbol_loading_off;
}
if (full)
return print_symbol_loading == print_symbol_loading_full;
return print_symbol_loading == print_symbol_loading_brief;
}
/* True if we are reading a symbol table. */
int currently_reading_symtab = 0;
static void
decrement_reading_symtab (void *dummy)
{
currently_reading_symtab--;
gdb_assert (currently_reading_symtab >= 0);
}
/* Increment currently_reading_symtab and return a cleanup that can be
used to decrement it. */
struct cleanup *
increment_reading_symtab (void)
{
++currently_reading_symtab;
gdb_assert (currently_reading_symtab > 0);
return make_cleanup (decrement_reading_symtab, NULL);
}
/* Remember the lowest-addressed loadable section we've seen.
This function is called via bfd_map_over_sections.
In case of equal vmas, the section with the largest size becomes the
lowest-addressed loadable section.
If the vmas and sizes are equal, the last section is considered the
lowest-addressed loadable section. */
void
find_lowest_section (bfd *abfd, asection *sect, void *obj)
{
asection **lowest = (asection **) obj;
if (0 == (bfd_get_section_flags (abfd, sect) & (SEC_ALLOC | SEC_LOAD)))
return;
if (!*lowest)
*lowest = sect; /* First loadable section */
else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
*lowest = sect; /* A lower loadable section */
else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
&& (bfd_section_size (abfd, (*lowest))
<= bfd_section_size (abfd, sect)))
*lowest = sect;
}
/* Create a new section_addr_info, with room for NUM_SECTIONS. The
new object's 'num_sections' field is set to 0; it must be updated
by the caller. */
struct section_addr_info *
alloc_section_addr_info (size_t num_sections)
{
struct section_addr_info *sap;
size_t size;
size = (sizeof (struct section_addr_info)
+ sizeof (struct other_sections) * (num_sections - 1));
sap = (struct section_addr_info *) xmalloc (size);
memset (sap, 0, size);
return sap;
}
/* Build (allocate and populate) a section_addr_info struct from
an existing section table. */
extern struct section_addr_info *
build_section_addr_info_from_section_table (const struct target_section *start,
const struct target_section *end)
{
struct section_addr_info *sap;
const struct target_section *stp;
int oidx;
sap = alloc_section_addr_info (end - start);
for (stp = start, oidx = 0; stp != end; stp++)
{
struct bfd_section *asect = stp->the_bfd_section;
bfd *abfd = asect->owner;
if (bfd_get_section_flags (abfd, asect) & (SEC_ALLOC | SEC_LOAD)
&& oidx < end - start)
{
sap->other[oidx].addr = stp->addr;
sap->other[oidx].name = xstrdup (bfd_section_name (abfd, asect));
sap->other[oidx].sectindex = gdb_bfd_section_index (abfd, asect);
oidx++;
}
}
sap->num_sections = oidx;
return sap;
}
/* Create a section_addr_info from section offsets in ABFD. */
static struct section_addr_info *
build_section_addr_info_from_bfd (bfd *abfd)
{
struct section_addr_info *sap;
int i;
struct bfd_section *sec;
sap = alloc_section_addr_info (bfd_count_sections (abfd));
for (i = 0, sec = abfd->sections; sec != NULL; sec = sec->next)
if (bfd_get_section_flags (abfd, sec) & (SEC_ALLOC | SEC_LOAD))
{
sap->other[i].addr = bfd_get_section_vma (abfd, sec);
sap->other[i].name = xstrdup (bfd_get_section_name (abfd, sec));
sap->other[i].sectindex = gdb_bfd_section_index (abfd, sec);
i++;
}
sap->num_sections = i;
return sap;
}
/* Create a section_addr_info from section offsets in OBJFILE. */
struct section_addr_info *
build_section_addr_info_from_objfile (const struct objfile *objfile)
{
struct section_addr_info *sap;
int i;
/* Before reread_symbols gets rewritten it is not safe to call:
gdb_assert (objfile->num_sections == bfd_count_sections (objfile->obfd));
*/
sap = build_section_addr_info_from_bfd (objfile->obfd);
for (i = 0; i < sap->num_sections; i++)
{
int sectindex = sap->other[i].sectindex;
sap->other[i].addr += objfile->section_offsets->offsets[sectindex];
}
return sap;
}
/* Free all memory allocated by build_section_addr_info_from_section_table. */
extern void
free_section_addr_info (struct section_addr_info *sap)
{
int idx;
for (idx = 0; idx < sap->num_sections; idx++)
xfree (sap->other[idx].name);
xfree (sap);
}
/* Initialize OBJFILE's sect_index_* members. */
static void
init_objfile_sect_indices (struct objfile *objfile)
{
asection *sect;
int i;
sect = bfd_get_section_by_name (objfile->obfd, ".text");
if (sect)
objfile->sect_index_text = sect->index;
sect = bfd_get_section_by_name (objfile->obfd, ".data");
if (sect)
objfile->sect_index_data = sect->index;
sect = bfd_get_section_by_name (objfile->obfd, ".bss");
if (sect)
objfile->sect_index_bss = sect->index;
sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
if (sect)
objfile->sect_index_rodata = sect->index;
/* This is where things get really weird... We MUST have valid
indices for the various sect_index_* members or gdb will abort.
So if for example, there is no ".text" section, we have to
accomodate that. First, check for a file with the standard
one or two segments. */
symfile_find_segment_sections (objfile);
/* Except when explicitly adding symbol files at some address,
section_offsets contains nothing but zeros, so it doesn't matter
which slot in section_offsets the individual sect_index_* members
index into. So if they are all zero, it is safe to just point
all the currently uninitialized indices to the first slot. But
beware: if this is the main executable, it may be relocated
later, e.g. by the remote qOffsets packet, and then this will
be wrong! That's why we try segments first. */
for (i = 0; i < objfile->num_sections; i++)
{
if (ANOFFSET (objfile->section_offsets, i) != 0)
{
break;
}
}
if (i == objfile->num_sections)
{
if (objfile->sect_index_text == -1)
objfile->sect_index_text = 0;
if (objfile->sect_index_data == -1)
objfile->sect_index_data = 0;
if (objfile->sect_index_bss == -1)
objfile->sect_index_bss = 0;
if (objfile->sect_index_rodata == -1)
objfile->sect_index_rodata = 0;
}
}
/* The arguments to place_section. */
struct place_section_arg
{
struct section_offsets *offsets;
CORE_ADDR lowest;
};
/* Find a unique offset to use for loadable section SECT if
the user did not provide an offset. */
static void
place_section (bfd *abfd, asection *sect, void *obj)
{
struct place_section_arg *arg = obj;
CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
int done;
ULONGEST align = ((ULONGEST) 1) << bfd_get_section_alignment (abfd, sect);
/* We are only interested in allocated sections. */
if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
return;
/* If the user specified an offset, honor it. */
if (offsets[gdb_bfd_section_index (abfd, sect)] != 0)
return;
/* Otherwise, let's try to find a place for the section. */
start_addr = (arg->lowest + align - 1) & -align;
do {
asection *cur_sec;
done = 1;
for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
{
int indx = cur_sec->index;
/* We don't need to compare against ourself. */
if (cur_sec == sect)
continue;
/* We can only conflict with allocated sections. */
if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
continue;
/* If the section offset is 0, either the section has not been placed
yet, or it was the lowest section placed (in which case LOWEST
will be past its end). */
if (offsets[indx] == 0)
continue;
/* If this section would overlap us, then we must move up. */
if (start_addr + bfd_get_section_size (sect) > offsets[indx]
&& start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
{
start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
start_addr = (start_addr + align - 1) & -align;
done = 0;
break;
}
/* Otherwise, we appear to be OK. So far. */
}
}
while (!done);
offsets[gdb_bfd_section_index (abfd, sect)] = start_addr;
arg->lowest = start_addr + bfd_get_section_size (sect);
}
/* Store struct section_addr_info as prepared (made relative and with SECTINDEX
filled-in) by addr_info_make_relative into SECTION_OFFSETS of NUM_SECTIONS
entries. */
void
relative_addr_info_to_section_offsets (struct section_offsets *section_offsets,
int num_sections,
const struct section_addr_info *addrs)
{
int i;
memset (section_offsets, 0, SIZEOF_N_SECTION_OFFSETS (num_sections));
/* Now calculate offsets for section that were specified by the caller. */
for (i = 0; i < addrs->num_sections; i++)
{
const struct other_sections *osp;
osp = &addrs->other[i];
if (osp->sectindex == -1)
continue;
/* Record all sections in offsets. */
/* The section_offsets in the objfile are here filled in using
the BFD index. */
section_offsets->offsets[osp->sectindex] = osp->addr;
}
}
/* Transform section name S for a name comparison. prelink can split section
`.bss' into two sections `.dynbss' and `.bss' (in this order). Similarly
prelink can split `.sbss' into `.sdynbss' and `.sbss'. Use virtual address
of the new `.dynbss' (`.sdynbss') section as the adjacent new `.bss'
(`.sbss') section has invalid (increased) virtual address. */
static const char *
addr_section_name (const char *s)
{
if (strcmp (s, ".dynbss") == 0)
return ".bss";
if (strcmp (s, ".sdynbss") == 0)
return ".sbss";
return s;
}
/* qsort comparator for addrs_section_sort. Sort entries in ascending order by
their (name, sectindex) pair. sectindex makes the sort by name stable. */
static int
addrs_section_compar (const void *ap, const void *bp)
{
const struct other_sections *a = *((struct other_sections **) ap);
const struct other_sections *b = *((struct other_sections **) bp);
int retval;
retval = strcmp (addr_section_name (a->name), addr_section_name (b->name));
if (retval)
return retval;
return a->sectindex - b->sectindex;
}
/* Provide sorted array of pointers to sections of ADDRS. The array is
terminated by NULL. Caller is responsible to call xfree for it. */
static struct other_sections **
addrs_section_sort (struct section_addr_info *addrs)
{
struct other_sections **array;
int i;
/* `+ 1' for the NULL terminator. */
array = XNEWVEC (struct other_sections *, addrs->num_sections + 1);
for (i = 0; i < addrs->num_sections; i++)
array[i] = &addrs->other[i];
array[i] = NULL;
qsort (array, i, sizeof (*array), addrs_section_compar);
return array;
}
/* Relativize absolute addresses in ADDRS into offsets based on ABFD. Fill-in
also SECTINDEXes specific to ABFD there. This function can be used to
rebase ADDRS to start referencing different BFD than before. */
void
addr_info_make_relative (struct section_addr_info *addrs, bfd *abfd)
{
asection *lower_sect;
CORE_ADDR lower_offset;
int i;
struct cleanup *my_cleanup;
struct section_addr_info *abfd_addrs;
struct other_sections **addrs_sorted, **abfd_addrs_sorted;
struct other_sections **addrs_to_abfd_addrs;
/* Find lowest loadable section to be used as starting point for
continguous sections. */
lower_sect = NULL;
bfd_map_over_sections (abfd, find_lowest_section, &lower_sect);
if (lower_sect == NULL)
{
warning (_("no loadable sections found in added symbol-file %s"),
bfd_get_filename (abfd));
lower_offset = 0;
}
else
lower_offset = bfd_section_vma (bfd_get_filename (abfd), lower_sect);
/* Create ADDRS_TO_ABFD_ADDRS array to map the sections in ADDRS to sections
in ABFD. Section names are not unique - there can be multiple sections of
the same name. Also the sections of the same name do not have to be
adjacent to each other. Some sections may be present only in one of the
files. Even sections present in both files do not have to be in the same
order.
Use stable sort by name for the sections in both files. Then linearly
scan both lists matching as most of the entries as possible. */
addrs_sorted = addrs_section_sort (addrs);
my_cleanup = make_cleanup (xfree, addrs_sorted);
abfd_addrs = build_section_addr_info_from_bfd (abfd);
make_cleanup_free_section_addr_info (abfd_addrs);
abfd_addrs_sorted = addrs_section_sort (abfd_addrs);
make_cleanup (xfree, abfd_addrs_sorted);
/* Now create ADDRS_TO_ABFD_ADDRS from ADDRS_SORTED and
ABFD_ADDRS_SORTED. */
addrs_to_abfd_addrs = XCNEWVEC (struct other_sections *, addrs->num_sections);
make_cleanup (xfree, addrs_to_abfd_addrs);
while (*addrs_sorted)
{
const char *sect_name = addr_section_name ((*addrs_sorted)->name);
while (*abfd_addrs_sorted
&& strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
sect_name) < 0)
abfd_addrs_sorted++;
if (*abfd_addrs_sorted
&& strcmp (addr_section_name ((*abfd_addrs_sorted)->name),
sect_name) == 0)
{
int index_in_addrs;
/* Make the found item directly addressable from ADDRS. */
index_in_addrs = *addrs_sorted - addrs->other;
gdb_assert (addrs_to_abfd_addrs[index_in_addrs] == NULL);
addrs_to_abfd_addrs[index_in_addrs] = *abfd_addrs_sorted;
/* Never use the same ABFD entry twice. */
abfd_addrs_sorted++;
}
addrs_sorted++;
}
/* Calculate offsets for the loadable sections.
FIXME! Sections must be in order of increasing loadable section
so that contiguous sections can use the lower-offset!!!
Adjust offsets if the segments are not contiguous.
If the section is contiguous, its offset should be set to
the offset of the highest loadable section lower than it
(the loadable section directly below it in memory).
this_offset = lower_offset = lower_addr - lower_orig_addr */
for (i = 0; i < addrs->num_sections; i++)
{
struct other_sections *sect = addrs_to_abfd_addrs[i];
if (sect)
{
/* This is the index used by BFD. */
addrs->other[i].sectindex = sect->sectindex;
if (addrs->other[i].addr != 0)
{
addrs->other[i].addr -= sect->addr;
lower_offset = addrs->other[i].addr;
}
else
addrs->other[i].addr = lower_offset;
}
else
{
/* addr_section_name transformation is not used for SECT_NAME. */
const char *sect_name = addrs->other[i].name;
/* This section does not exist in ABFD, which is normally
unexpected and we want to issue a warning.
However, the ELF prelinker does create a few sections which are
marked in the main executable as loadable (they are loaded in
memory from the DYNAMIC segment) and yet are not present in
separate debug info files. This is fine, and should not cause
a warning. Shared libraries contain just the section
".gnu.liblist" but it is not marked as loadable there. There is
no other way to identify them than by their name as the sections
created by prelink have no special flags.
For the sections `.bss' and `.sbss' see addr_section_name. */
if (!(strcmp (sect_name, ".gnu.liblist") == 0
|| strcmp (sect_name, ".gnu.conflict") == 0
|| (strcmp (sect_name, ".bss") == 0
&& i > 0
&& strcmp (addrs->other[i - 1].name, ".dynbss") == 0
&& addrs_to_abfd_addrs[i - 1] != NULL)
|| (strcmp (sect_name, ".sbss") == 0
&& i > 0
&& strcmp (addrs->other[i - 1].name, ".sdynbss") == 0
&& addrs_to_abfd_addrs[i - 1] != NULL)))
warning (_("section %s not found in %s"), sect_name,
bfd_get_filename (abfd));
addrs->other[i].addr = 0;
addrs->other[i].sectindex = -1;
}
}
do_cleanups (my_cleanup);
}
/* Parse the user's idea of an offset for dynamic linking, into our idea
of how to represent it for fast symbol reading. This is the default
version of the sym_fns.sym_offsets function for symbol readers that
don't need to do anything special. It allocates a section_offsets table
for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
void
default_symfile_offsets (struct objfile *objfile,
const struct section_addr_info *addrs)
{
objfile->num_sections = gdb_bfd_count_sections (objfile->obfd);
objfile->section_offsets = (struct section_offsets *)
obstack_alloc (&objfile->objfile_obstack,
SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
relative_addr_info_to_section_offsets (objfile->section_offsets,
objfile->num_sections, addrs);
/* For relocatable files, all loadable sections will start at zero.
The zero is meaningless, so try to pick arbitrary addresses such
that no loadable sections overlap. This algorithm is quadratic,
but the number of sections in a single object file is generally
small. */
if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
{
struct place_section_arg arg;
bfd *abfd = objfile->obfd;
asection *cur_sec;
for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
/* We do not expect this to happen; just skip this step if the
relocatable file has a section with an assigned VMA. */
if (bfd_section_vma (abfd, cur_sec) != 0)
break;
if (cur_sec == NULL)
{
CORE_ADDR *offsets = objfile->section_offsets->offsets;
/* Pick non-overlapping offsets for sections the user did not
place explicitly. */
arg.offsets = objfile->section_offsets;
arg.lowest = 0;
bfd_map_over_sections (objfile->obfd, place_section, &arg);
/* Correctly filling in the section offsets is not quite
enough. Relocatable files have two properties that
(most) shared objects do not:
- Their debug information will contain relocations. Some
shared libraries do also, but many do not, so this can not
be assumed.
- If there are multiple code sections they will be loaded
at different relative addresses in memory than they are
in the objfile, since all sections in the file will start
at address zero.
Because GDB has very limited ability to map from an
address in debug info to the correct code section,
it relies on adding SECT_OFF_TEXT to things which might be
code. If we clear all the section offsets, and set the
section VMAs instead, then symfile_relocate_debug_section
will return meaningful debug information pointing at the
correct sections.
GDB has too many different data structures for section
addresses - a bfd, objfile, and so_list all have section
tables, as does exec_ops. Some of these could probably
be eliminated. */
for (cur_sec = abfd->sections; cur_sec != NULL;
cur_sec = cur_sec->next)
{
if ((bfd_get_section_flags (abfd, cur_sec) & SEC_ALLOC) == 0)
continue;
bfd_set_section_vma (abfd, cur_sec, offsets[cur_sec->index]);
exec_set_section_address (bfd_get_filename (abfd),
cur_sec->index,
offsets[cur_sec->index]);
offsets[cur_sec->index] = 0;
}
}
}
/* Remember the bfd indexes for the .text, .data, .bss and
.rodata sections. */
init_objfile_sect_indices (objfile);
}
/* Divide the file into segments, which are individual relocatable units.
This is the default version of the sym_fns.sym_segments function for
symbol readers that do not have an explicit representation of segments.
It assumes that object files do not have segments, and fully linked
files have a single segment. */
struct symfile_segment_data *
default_symfile_segments (bfd *abfd)
{
int num_sections, i;
asection *sect;
struct symfile_segment_data *data;
CORE_ADDR low, high;
/* Relocatable files contain enough information to position each
loadable section independently; they should not be relocated
in segments. */
if ((bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) == 0)
return NULL;
/* Make sure there is at least one loadable section in the file. */
for (sect = abfd->sections; sect != NULL; sect = sect->next)
{
if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
continue;
break;
}
if (sect == NULL)
return NULL;
low = bfd_get_section_vma (abfd, sect);
high = low + bfd_get_section_size (sect);
data = XCNEW (struct symfile_segment_data);
data->num_segments = 1;
data->segment_bases = XCNEW (CORE_ADDR);
data->segment_sizes = XCNEW (CORE_ADDR);
num_sections = bfd_count_sections (abfd);
data->segment_info = XCNEWVEC (int, num_sections);
for (i = 0, sect = abfd->sections; sect != NULL; i++, sect = sect->next)
{
CORE_ADDR vma;
if ((bfd_get_section_flags (abfd, sect) & SEC_ALLOC) == 0)
continue;
vma = bfd_get_section_vma (abfd, sect);
if (vma < low)
low = vma;
if (vma + bfd_get_section_size (sect) > high)
high = vma + bfd_get_section_size (sect);
data->segment_info[i] = 1;
}
data->segment_bases[0] = low;
data->segment_sizes[0] = high - low;
return data;
}
/* This is a convenience function to call sym_read for OBJFILE and
possibly force the partial symbols to be read. */
static void
read_symbols (struct objfile *objfile, int add_flags)
{
(*objfile->sf->sym_read) (objfile, add_flags);
objfile->per_bfd->minsyms_read = 1;
/* find_separate_debug_file_in_section should be called only if there is
single binary with no existing separate debug info file. */
if (!objfile_has_partial_symbols (objfile)
&& objfile->separate_debug_objfile == NULL
&& objfile->separate_debug_objfile_backlink == NULL)
{
bfd *abfd = find_separate_debug_file_in_section (objfile);
struct cleanup *cleanup = make_cleanup_bfd_unref (abfd);
if (abfd != NULL)
{
/* find_separate_debug_file_in_section uses the same filename for the
virtual section-as-bfd like the bfd filename containing the
section. Therefore use also non-canonical name form for the same
file containing the section. */
symbol_file_add_separate (abfd, objfile->original_name, add_flags,
objfile);
}
do_cleanups (cleanup);
}
if ((add_flags & SYMFILE_NO_READ) == 0)
require_partial_symbols (objfile, 0);
}
/* Initialize entry point information for this objfile. */
static void
init_entry_point_info (struct objfile *objfile)
{
struct entry_info *ei = &objfile->per_bfd->ei;
if (ei->initialized)
return;
ei->initialized = 1;
/* Save startup file's range of PC addresses to help blockframe.c
decide where the bottom of the stack is. */
if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
{
/* Executable file -- record its entry point so we'll recognize
the startup file because it contains the entry point. */
ei->entry_point = bfd_get_start_address (objfile->obfd);
ei->entry_point_p = 1;
}
else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
&& bfd_get_start_address (objfile->obfd) != 0)
{
/* Some shared libraries may have entry points set and be
runnable. There's no clear way to indicate this, so just check
for values other than zero. */
ei->entry_point = bfd_get_start_address (objfile->obfd);
ei->entry_point_p = 1;
}
else
{
/* Examination of non-executable.o files. Short-circuit this stuff. */
ei->entry_point_p = 0;
}
if (ei->entry_point_p)
{
struct obj_section *osect;
CORE_ADDR entry_point = ei->entry_point;
int found;
/* Make certain that the address points at real code, and not a
function descriptor. */
entry_point
= gdbarch_convert_from_func_ptr_addr (get_objfile_arch (objfile),
entry_point,
¤t_target);
/* Remove any ISA markers, so that this matches entries in the
symbol table. */
ei->entry_point
= gdbarch_addr_bits_remove (get_objfile_arch (objfile), entry_point);
found = 0;
ALL_OBJFILE_OSECTIONS (objfile, osect)
{
struct bfd_section *sect = osect->the_bfd_section;
if (entry_point >= bfd_get_section_vma (objfile->obfd, sect)
&& entry_point < (bfd_get_section_vma (objfile->obfd, sect)
+ bfd_get_section_size (sect)))
{
ei->the_bfd_section_index
= gdb_bfd_section_index (objfile->obfd, sect);
found = 1;
break;
}
}
if (!found)
ei->the_bfd_section_index = SECT_OFF_TEXT (objfile);
}
}
/* Process a symbol file, as either the main file or as a dynamically
loaded file.
This function does not set the OBJFILE's entry-point info.
OBJFILE is where the symbols are to be read from.
ADDRS is the list of section load addresses. If the user has given
an 'add-symbol-file' command, then this is the list of offsets and
addresses he or she provided as arguments to the command; or, if
we're handling a shared library, these are the actual addresses the
sections are loaded at, according to the inferior's dynamic linker
(as gleaned by GDB's shared library code). We convert each address
into an offset from the section VMA's as it appears in the object
file, and then call the file's sym_offsets function to convert this
into a format-specific offset table --- a `struct section_offsets'.
ADD_FLAGS encodes verbosity level, whether this is main symbol or
an extra symbol file such as dynamically loaded code, and wether
breakpoint reset should be deferred. */
static void
syms_from_objfile_1 (struct objfile *objfile,
struct section_addr_info *addrs,