/* Handle shared libraries for GDB, the GNU Debugger.
- Copyright (C) 1990-2020 Free Software Foundation, Inc.
+ Copyright (C) 1990-2022 Free Software Foundation, Inc.
This file is part of GDB.
#include <fcntl.h>
#include "symtab.h"
#include "bfd.h"
+#include "build-id.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "command.h"
#include "target.h"
#include "frame.h"
-#include "gdb_regex.h"
+#include "gdbsupport/gdb_regex.h"
#include "inferior.h"
#include "gdbsupport/environ.h"
#include "language.h"
#include "gdbcmd.h"
#include "completer.h"
+#include "elf/external.h"
+#include "elf/common.h"
#include "filenames.h" /* for DOSish file names */
#include "exec.h"
#include "solist.h"
#include "filesystem.h"
#include "gdb_bfd.h"
#include "gdbsupport/filestuff.h"
+#include "gdbsupport/scoped_fd.h"
+#include "debuginfod-support.h"
#include "source.h"
#include "cli/cli-style.h"
/* If non-empty, this is a search path for loading non-absolute shared library
symbol files. This takes precedence over the environment variables PATH
and LD_LIBRARY_PATH. */
-static char *solib_search_path = NULL;
+static std::string solib_search_path;
static void
show_solib_search_path (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- fprintf_filtered (file, _("The search path for loading non-absolute "
- "shared library symbol files is %s.\n"),
- value);
+ gdb_printf (file, _("The search path for loading non-absolute "
+ "shared library symbol files is %s.\n"),
+ value);
}
/* Same as HAVE_DOS_BASED_FILE_SYSTEM, but useable as an rvalue. */
int found_file = -1;
gdb::unique_xmalloc_ptr<char> temp_pathname;
const char *fskind = effective_target_file_system_kind ();
- const char *sysroot = gdb_sysroot;
+ const char *sysroot = gdb_sysroot.c_str ();
int prefix_len, orig_prefix_len;
/* If the absolute prefix starts with "target:" but the filesystem
}
/* Now see if we can open it. */
- found_file = gdb_open_cloexec (temp_pathname.get (), O_RDONLY | O_BINARY, 0);
+ found_file = gdb_open_cloexec (temp_pathname.get (),
+ O_RDONLY | O_BINARY, 0).release ();
/* If the search in gdb_sysroot failed, and the path name has a
drive spec (e.g, c:/foo), try stripping ':' from the drive spec,
in_pathname + 2, (char *) NULL));
found_file = gdb_open_cloexec (temp_pathname.get (),
- O_RDONLY | O_BINARY, 0);
+ O_RDONLY | O_BINARY, 0).release ();
if (found_file < 0)
{
/* If the search in gdb_sysroot still failed, try fully
in_pathname + 2, (char *) NULL));
found_file = gdb_open_cloexec (temp_pathname.get (),
- O_RDONLY | O_BINARY, 0);
+ O_RDONLY | O_BINARY, 0).release ();
}
}
/* If not found, and we're looking for a solib, search the
solib_search_path (if any). */
- if (is_solib && found_file < 0 && solib_search_path != NULL)
- found_file = openp (solib_search_path,
+ if (is_solib && found_file < 0 && !solib_search_path.empty ())
+ found_file = openp (solib_search_path.c_str (),
OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
in_pathname, O_RDONLY | O_BINARY, &temp_pathname);
solib_search_path (if any) for the basename only (ignoring the
path). This is to allow reading solibs from a path that differs
from the opened path. */
- if (is_solib && found_file < 0 && solib_search_path != NULL)
- found_file = openp (solib_search_path,
+ if (is_solib && found_file < 0 && !solib_search_path.empty ())
+ found_file = openp (solib_search_path.c_str (),
OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
target_lbasename (fskind, in_pathname),
O_RDONLY | O_BINARY, &temp_pathname);
if (in_pathname == NULL)
return NULL;
- if (*gdb_sysroot != '\0' && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname))
+ if (!gdb_sysroot.empty () && IS_TARGET_ABSOLUTE_PATH (fskind, in_pathname))
{
result = solib_find_1 (in_pathname, fd, false);
/* Check bfd arch. */
b = gdbarch_bfd_arch_info (target_gdbarch ());
if (!b->compatible (b, bfd_get_arch_info (abfd.get ())))
- warning (_("`%s': Shared library architecture %s is not compatible "
- "with target architecture %s."), bfd_get_filename (abfd.get ()),
- bfd_get_arch_info (abfd.get ())->printable_name,
- b->printable_name);
+ error (_("`%s': Shared library architecture %s is not compatible "
+ "with target architecture %s."), bfd_get_filename (abfd.get ()),
+ bfd_get_arch_info (abfd.get ())->printable_name,
+ b->printable_name);
return abfd;
}
+/* Mapping of a core file's shared library sonames to their respective
+ build-ids. Added to the registries of core file bfds. */
+
+typedef std::unordered_map<std::string, std::string> soname_build_id_map;
+
+/* Key used to associate a soname_build_id_map to a core file bfd. */
+
+static const struct bfd_key<soname_build_id_map> cbfd_soname_build_id_data_key;
+
+/* See solib.h. */
+
+void
+set_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd,
+ const char *soname,
+ const bfd_build_id *build_id)
+{
+ gdb_assert (abfd.get () != nullptr);
+ gdb_assert (soname != nullptr);
+ gdb_assert (build_id != nullptr);
+
+ soname_build_id_map *mapptr = cbfd_soname_build_id_data_key.get (abfd.get ());
+
+ if (mapptr == nullptr)
+ mapptr = cbfd_soname_build_id_data_key.emplace (abfd.get ());
+
+ (*mapptr)[soname] = build_id_to_string (build_id);
+}
+
+/* See solib.h. */
+
+gdb::unique_xmalloc_ptr<char>
+get_cbfd_soname_build_id (gdb_bfd_ref_ptr abfd, const char *soname)
+{
+ if (abfd.get () == nullptr || soname == nullptr)
+ return {};
+
+ soname_build_id_map *mapptr
+ = cbfd_soname_build_id_data_key.get (abfd.get ());
+
+ if (mapptr == nullptr)
+ return {};
+
+ auto it = mapptr->find (lbasename (soname));
+ if (it == mapptr->end ())
+ return {};
+
+ return make_unique_xstrdup (it->second.c_str ());
+}
+
/* Given a pointer to one of the shared objects in our list of mapped
objects, use the recorded name to open a bfd descriptor for the
object, build a section table, relocate all the section addresses
gdb::unique_xmalloc_ptr<char> filename (tilde_expand (so->so_name));
gdb_bfd_ref_ptr abfd (ops->bfd_open (filename.get ()));
+ gdb::unique_xmalloc_ptr<char> build_id_hexstr
+ = get_cbfd_soname_build_id (current_program_space->cbfd, so->so_name);
+
+ /* If we already know the build-id of this solib from a core file, verify
+ it matches ABFD's build-id. If there is a mismatch or the solib wasn't
+ found, attempt to query debuginfod for the correct solib. */
+ if (build_id_hexstr.get () != nullptr)
+ {
+ bool mismatch = false;
+
+ if (abfd != nullptr && abfd->build_id != nullptr)
+ {
+ std::string build_id = build_id_to_string (abfd->build_id);
+
+ if (build_id != build_id_hexstr.get ())
+ mismatch = true;
+ }
+ if (abfd == nullptr || mismatch)
+ {
+ scoped_fd fd = debuginfod_exec_query ((const unsigned char*)
+ build_id_hexstr.get (),
+ 0, so->so_name, &filename);
+
+ if (fd.get () >= 0)
+ abfd = ops->bfd_open (filename.get ());
+ else if (mismatch)
+ warning (_("Build-id of %ps does not match core file."),
+ styled_string (file_name_style.style (), filename.get ()));
+ }
+ }
if (abfd == NULL)
return 0;
Uses a fairly simplistic heuristic approach where we check
the file name against "/libpthread". This can lead to false
- positives, but this should be good enough in practice. */
+ positives, but this should be good enough in practice.
+
+ As of glibc-2.34, functions formerly residing in libpthread have
+ been moved to libc, so "/libc." needs to be checked too. (Matching
+ the "." will avoid matching libraries such as libcrypt.) */
bool
libpthread_name_p (const char *name)
{
- return (strstr (name, "/libpthread") != NULL);
+ return (strstr (name, "/libpthread") != NULL
+ || strstr (name, "/libc.") != NULL );
}
/* Return non-zero if SO is the libpthread shared library. */
{
if (pattern != NULL)
{
- printf_unfiltered (_("Loading symbols for shared libraries: %s\n"),
- pattern);
+ gdb_printf (_("Loading symbols for shared libraries: %s\n"),
+ pattern);
}
else
- printf_unfiltered (_("Loading symbols for shared libraries.\n"));
+ gdb_printf (_("Loading symbols for shared libraries.\n"));
}
current_program_space->solib_add_generation++;
/* If no pattern was given, be quiet for shared
libraries we have already loaded. */
if (pattern && (from_tty || info_verbose))
- printf_unfiltered (_("Symbols already loaded for %s\n"),
- gdb->so_name);
+ gdb_printf (_("Symbols already loaded for %s\n"),
+ gdb->so_name);
}
else if (solib_read_symbols (gdb, add_flags))
loaded_any_symbols = true;
breakpoint_re_set ();
if (from_tty && pattern && ! any_matches)
- printf_unfiltered
+ gdb_printf
("No loaded shared libraries match the pattern `%s'.\n", pattern);
if (loaded_any_symbols)
reload_shared_libraries_1 (int from_tty)
{
if (print_symbol_loading_p (from_tty, 0, 0))
- printf_unfiltered (_("Loading symbols for shared libraries.\n"));
+ gdb_printf (_("Loading symbols for shared libraries.\n"));
for (struct so_list *so : current_program_space->solibs ())
{
const char *old_prefix = "remote:";
const char *new_prefix = TARGET_SYSROOT_PREFIX;
- if (startswith (gdb_sysroot, old_prefix))
+ if (startswith (gdb_sysroot.c_str (), old_prefix))
{
static bool warning_issued = false;
gdb_assert (strlen (old_prefix) == strlen (new_prefix));
- memcpy (gdb_sysroot, new_prefix, strlen (new_prefix));
+ gdb_sysroot = new_prefix + gdb_sysroot.substr (strlen (old_prefix));
if (!warning_issued)
{
warning (_("\"%s\" is deprecated, use \"%s\" instead."),
old_prefix, new_prefix);
- warning (_("sysroot set to \"%s\"."), gdb_sysroot);
+ warning (_("sysroot set to \"%s\"."), gdb_sysroot.c_str ());
warning_issued = true;
}
show_auto_solib_add (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"),
- value);
+ gdb_printf (file, _("Autoloading of shared library symbols is %s.\n"),
+ value);
}
{
struct minimal_symbol msym {};
- SET_MSYMBOL_VALUE_ADDRESS (&msym, symaddr);
+ msym.set_value_address (symaddr);
gdbarch_elf_make_msymbol_special (gdbarch, sym, &msym);
- symaddr = MSYMBOL_VALUE_RAW_ADDRESS (&msym);
+ symaddr = msym.value_raw_address ();
}
/* BFD symbols are section relative. */
return symaddr;
}
+/* See solib.h. */
+
+int
+gdb_bfd_scan_elf_dyntag (const int desired_dyntag, bfd *abfd, CORE_ADDR *ptr,
+ CORE_ADDR *ptr_addr)
+{
+ int arch_size, step, sect_size;
+ long current_dyntag;
+ CORE_ADDR dyn_ptr, dyn_addr;
+ gdb_byte *bufend, *bufstart, *buf;
+ Elf32_External_Dyn *x_dynp_32;
+ Elf64_External_Dyn *x_dynp_64;
+ struct bfd_section *sect;
+
+ if (abfd == NULL)
+ return 0;
+
+ if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
+ return 0;
+
+ arch_size = bfd_get_arch_size (abfd);
+ if (arch_size == -1)
+ return 0;
+
+ /* Find the start address of the .dynamic section. */
+ sect = bfd_get_section_by_name (abfd, ".dynamic");
+ if (sect == NULL)
+ return 0;
+
+ bool found = false;
+ for (const target_section &target_section
+ : current_program_space->target_sections ())
+ if (sect == target_section.the_bfd_section)
+ {
+ dyn_addr = target_section.addr;
+ found = true;
+ break;
+ }
+ if (!found)
+ {
+ /* ABFD may come from OBJFILE acting only as a symbol file without being
+ loaded into the target (see add_symbol_file_command). This case is
+ such fallback to the file VMA address without the possibility of
+ having the section relocated to its actual in-memory address. */
+
+ dyn_addr = bfd_section_vma (sect);
+ }
+
+ /* Read in .dynamic from the BFD. We will get the actual value
+ from memory later. */
+ sect_size = bfd_section_size (sect);
+ buf = bufstart = (gdb_byte *) alloca (sect_size);
+ if (!bfd_get_section_contents (abfd, sect,
+ buf, 0, sect_size))
+ return 0;
+
+ /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */
+ step = (arch_size == 32) ? sizeof (Elf32_External_Dyn)
+ : sizeof (Elf64_External_Dyn);
+ for (bufend = buf + sect_size;
+ buf < bufend;
+ buf += step)
+ {
+ if (arch_size == 32)
+ {
+ x_dynp_32 = (Elf32_External_Dyn *) buf;
+ current_dyntag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag);
+ dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr);
+ }
+ else
+ {
+ x_dynp_64 = (Elf64_External_Dyn *) buf;
+ current_dyntag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag);
+ dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr);
+ }
+ if (current_dyntag == DT_NULL)
+ return 0;
+ if (current_dyntag == desired_dyntag)
+ {
+ /* If requested, try to read the runtime value of this .dynamic
+ entry. */
+ if (ptr)
+ {
+ struct type *ptr_type;
+ gdb_byte ptr_buf[8];
+ CORE_ADDR ptr_addr_1;
+
+ ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
+ ptr_addr_1 = dyn_addr + (buf - bufstart) + arch_size / 8;
+ if (target_read_memory (ptr_addr_1, ptr_buf, arch_size / 8) == 0)
+ dyn_ptr = extract_typed_address (ptr_buf, ptr_type);
+ *ptr = dyn_ptr;
+ if (ptr_addr)
+ *ptr_addr = dyn_addr + (buf - bufstart);
+ }
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/* See solib.h. */
+
+gdb::unique_xmalloc_ptr<char>
+gdb_bfd_read_elf_soname (const char *filename)
+{
+ gdb_bfd_ref_ptr abfd = gdb_bfd_open (filename, gnutarget);
+
+ if (abfd == nullptr)
+ return {};
+
+ /* Check that ABFD is an ET_DYN ELF file. */
+ if (!bfd_check_format (abfd.get (), bfd_object)
+ || !(bfd_get_file_flags (abfd.get ()) & DYNAMIC))
+ return {};
+
+ CORE_ADDR idx;
+ if (!gdb_bfd_scan_elf_dyntag (DT_SONAME, abfd.get (), &idx, nullptr))
+ return {};
+
+ struct bfd_section *dynstr = bfd_get_section_by_name (abfd.get (), ".dynstr");
+ int sect_size = bfd_section_size (dynstr);
+ if (dynstr == nullptr || sect_size <= idx)
+ return {};
+
+ /* Read soname from the string table. */
+ gdb::byte_vector dynstr_buf;
+ if (!gdb_bfd_get_full_section_contents (abfd.get (), dynstr, &dynstr_buf))
+ return {};
+
+ /* Ensure soname is null-terminated before returning a copy. */
+ char *soname = (char *) dynstr_buf.data () + idx;
+ if (strnlen (soname, sect_size - idx) == sect_size - idx)
+ return {};
+
+ return make_unique_xstrdup (soname);
+}
+
/* Lookup the value for a specific symbol from symbol table. Look up symbol
from ABFD. MATCH_SYM is a callback function to determine whether to pick
up a symbol. DATA is the input of this callback function. Return NULL
{
solib_data = gdbarch_data_register_pre_init (solib_init);
- gdb::observers::free_objfile.attach (remove_user_added_objfile);
+ gdb::observers::free_objfile.attach (remove_user_added_objfile,
+ "solib");
gdb::observers::inferior_execd.attach ([] (inferior *inf)
{
solib_create_inferior_hook (0);
- });
+ }, "solib");
add_com ("sharedlibrary", class_files, sharedlibrary_command,
_("Load shared object library symbols for files matching REGEXP."));
- add_info ("sharedlibrary", info_sharedlibrary_command,
- _("Status of loaded shared object libraries."));
- add_info_alias ("dll", "sharedlibrary", 1);
+ cmd_list_element *info_sharedlibrary_cmd
+ = add_info ("sharedlibrary", info_sharedlibrary_command,
+ _("Status of loaded shared object libraries."));
+ add_info_alias ("dll", info_sharedlibrary_cmd, 1);
add_com ("nosharedlibrary", class_files, no_shared_libraries,
_("Unload all shared object library symbols."));
show_auto_solib_add,
&setlist, &showlist);
- add_setshow_optional_filename_cmd ("sysroot", class_support,
- &gdb_sysroot, _("\
+ set_show_commands sysroot_cmds
+ = add_setshow_optional_filename_cmd ("sysroot", class_support,
+ &gdb_sysroot, _("\
Set an alternate system root."), _("\
Show the current system root."), _("\
The system root is used to load absolute shared library symbol files.\n\
For other (relative) files, you can add directories using\n\
`set solib-search-path'."),
- gdb_sysroot_changed,
- NULL,
- &setlist, &showlist);
+ gdb_sysroot_changed,
+ NULL,
+ &setlist, &showlist);
- add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
+ add_alias_cmd ("solib-absolute-prefix", sysroot_cmds.set, class_support, 0,
&setlist);
- add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
+ add_alias_cmd ("solib-absolute-prefix", sysroot_cmds.show, class_support, 0,
&showlist);
add_setshow_optional_filename_cmd ("solib-search-path", class_support,
projects / binutils-gdb.git / blobdiff