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https://sourceware.org/git/glibc.git
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* elf/dl-lookup.c (dl_new_hash): New functions.
(_dl_lookup_symbol_x): Rename hash to old_hash and don't compute value here. Compute new-style hash value. Pass new hash value and reference to variable with the old value to do_lookup_x. (_dl_setup_hash): If DT_GNU_HASH is defined, use it and not old-style hash table. (_dl_debug_bindings): Pass new hash value and reference to variable with the old value to do_lookup_x. * elf/do-lookup.h (do_lookup_x): Accept additional parameter with new-style hash value and change old-style hash value parameter to be a reference. Reoganize functions to determine whether new-style hash table is available. Only fall back on old-style table. If old-style hash value is needed, compute it here. * elf/dynamic-link.h (elf_get_dynamic_info): Relocate DT_GNU_HASH entry. * elf/elf.h: Define SHT_GNU_HASH, DT_GNU_HASH, DT_TLSDEC_PLT, DT_TLSDEC_GOT. Adjust DT_ADDRNUM. * include/link.h (struct link_map): Add l_gnu_bitmask_idxbits, l_gnu_shift, l_gnu_bitmask, l_gnu_buckets and l_gnu_chain_zero. * Makeconfig: If linker supports --hash-style option add it to all linker command lines to build DSOs. * config.make.in: Define have-hash-style. * configure.in: Test whether linker supports --hash-style option. * elf/dl-misc.c (_dl_name_match_p): Make MAP parameter const. * sysdeps/generic/ldsodefs.h: Adjust prototype.
This commit is contained in:
Ulrich Drepper
parent
f3be81a91c
commit
871b91589b
29
ChangeLog
29
ChangeLog
@ -1,3 +1,32 @@
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2006-07-10 Ulrich Drepper <drepper@redhat.com>
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* elf/dl-lookup.c (dl_new_hash): New functions.
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(_dl_lookup_symbol_x): Rename hash to old_hash and don't compute
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value here. Compute new-style hash value. Pass new hash value
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and reference to variable with the old value to do_lookup_x.
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(_dl_setup_hash): If DT_GNU_HASH is defined, use it and not
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old-style hash table.
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(_dl_debug_bindings): Pass new hash value and reference to variable
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with the old value to do_lookup_x.
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* elf/do-lookup.h (do_lookup_x): Accept additional parameter with
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new-style hash value and change old-style hash value parameter to
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be a reference. Reoganize functions to determine whether
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new-style hash table is available. Only fall back on old-style
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table. If old-style hash value is needed, compute it here.
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* elf/dynamic-link.h (elf_get_dynamic_info): Relocate DT_GNU_HASH
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entry.
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* elf/elf.h: Define SHT_GNU_HASH, DT_GNU_HASH, DT_TLSDEC_PLT,
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DT_TLSDEC_GOT. Adjust DT_ADDRNUM.
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* include/link.h (struct link_map): Add l_gnu_bitmask_idxbits,
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l_gnu_shift, l_gnu_bitmask, l_gnu_buckets and l_gnu_chain_zero.
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* Makeconfig: If linker supports --hash-style option add it to all
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linker command lines to build DSOs.
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* config.make.in: Define have-hash-style.
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* configure.in: Test whether linker supports --hash-style option.
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* elf/dl-misc.c (_dl_name_match_p): Make MAP parameter const.
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* sysdeps/generic/ldsodefs.h: Adjust prototype.
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2006-06-27 Ulrich Drepper <drepper@redhat.com>
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* elf/dl-load.c (open_path): Fix test to determine whether DSO is
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11
Makeconfig
11
Makeconfig
@ -413,11 +413,20 @@ LDFLAGS.so += $(relro-LDFLAGS)
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LDFLAGS-rtld += $(relro-LDFLAGS)
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endif
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ifeq (yes,$(have-hash-style))
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# For the time being we unconditionally use 'both'. At some time we
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# should declare statically linked code as 'out of luck' and compile
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# with --hash-style=gnu only.
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hashstyle-LDFLAGS = -Wl,--hash-style=both
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LDFLAGS.so += $(hashstyle-LDFLAGS)
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LDFLAGS-rtld += $(hashstyle-LDFLAGS)
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endif
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# Command for linking programs with the C library.
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ifndef +link
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+link = $(CC) -nostdlib -nostartfiles -o $@ \
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$(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
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$(combreloc-LDFLAGS) $(relro-LDFLAGS) \
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$(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
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$(addprefix $(csu-objpfx),$(start-installed-name)) \
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$(+preinit) $(+prector) \
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$(filter-out $(addprefix $(csu-objpfx),start.o \
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6
NEWS
6
NEWS
@ -1,4 +1,4 @@
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GNU C Library NEWS -- history of user-visible changes. 2006-05-24
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GNU C Library NEWS -- history of user-visible changes. 2006-07-10
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Copyright (C) 1992-2002,2003,2004,2005,2006 Free Software Foundation, Inc.
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See the end for copying conditions.
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@ -13,7 +13,7 @@ Version 2.5
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* Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
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Implemented by Ulrich Drepper.
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* New Linux interfaces: splice, tee, sync_file_range, vmsplace.
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* New Linux interfaces: splice, tee, sync_file_range, vmsplice.
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* New iconv module for MIK. Contributed by Alexander Shopov.
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@ -31,6 +31,8 @@ Version 2.5
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* The interfaces introduced in RFC 3542 have been implemented by
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Ulrich Drepper.
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* Support for the new ELF hash table format was added by Ulrich Drepper.
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Version 2.4
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@ -65,6 +65,7 @@ have-libcap = @have_libcap@
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have-cc-with-libunwind = @libc_cv_cc_with_libunwind@
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fno-unit-at-a-time = @fno_unit_at_a_time@
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bind-now = @bindnow@
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have-hash-style = @libc_cv_hashstyle@
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static-libgcc = @libc_cv_gcc_static_libgcc@
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30
configure
vendored
30
configure
vendored
@ -313,7 +313,7 @@ ac_includes_default="\
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# include <unistd.h>
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#endif"
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ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons add_on_subdirs base_machine submachine sysnames sysdeps_add_ons INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES CXX_SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_ssp libc_cv_have_initfini no_whole_archive exceptions LIBGD have_libaudit have_libcap have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
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ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons add_on_subdirs base_machine submachine sysnames sysdeps_add_ons INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES CXX_SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie libc_cv_hashstyle fno_unit_at_a_time libc_cv_ssp libc_cv_have_initfini no_whole_archive exceptions LIBGD have_libaudit have_libcap have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
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ac_subst_files=''
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# Initialize some variables set by options.
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@ -5876,6 +5876,33 @@ echo "$as_me:$LINENO: result: $libc_cv_fpie" >&5
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echo "${ECHO_T}$libc_cv_fpie" >&6
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echo "$as_me:$LINENO: checking for --hash-style option" >&5
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echo $ECHO_N "checking for --hash-style option... $ECHO_C" >&6
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if test "${libc_cv_hashstyle+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat > conftest.c <<EOF
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int _start (void) { return 42; }
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EOF
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
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-fPIC -shared -o conftest.so conftest.c
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-Wl,--hash-style=both -nostdlib 1>&5'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }
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then
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libc_cv_hashstyle=yes
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else
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libc_cv_hashstyle=no
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fi
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rm -f conftest*
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fi
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echo "$as_me:$LINENO: result: $libc_cv_hashstyle" >&5
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echo "${ECHO_T}$libc_cv_hashstyle" >&6
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fi
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echo "$as_me:$LINENO: checking for -fno-toplevel-reorder" >&5
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@ -8496,6 +8523,7 @@ s,@ASFLAGS_config@,$ASFLAGS_config,;t t
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s,@libc_cv_z_combreloc@,$libc_cv_z_combreloc,;t t
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s,@libc_cv_z_execstack@,$libc_cv_z_execstack,;t t
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s,@libc_cv_fpie@,$libc_cv_fpie,;t t
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s,@libc_cv_hashstyle@,$libc_cv_hashstyle,;t t
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s,@fno_unit_at_a_time@,$fno_unit_at_a_time,;t t
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s,@libc_cv_ssp@,$libc_cv_ssp,;t t
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s,@libc_cv_have_initfini@,$libc_cv_have_initfini,;t t
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16
configure.in
16
configure.in
@ -1589,6 +1589,22 @@ EOF
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rm -f conftest*])
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AC_SUBST(libc_cv_fpie)
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AC_CACHE_CHECK(for --hash-style option,
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libc_cv_hashstyle, [dnl
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cat > conftest.c <<EOF
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int _start (void) { return 42; }
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EOF
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if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
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-fPIC -shared -o conftest.so conftest.c
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-Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
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then
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libc_cv_hashstyle=yes
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else
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libc_cv_hashstyle=no
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fi
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rm -f conftest*])
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AC_SUBST(libc_cv_hashstyle)
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fi
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AC_CACHE_CHECK(for -fno-toplevel-reorder, libc_cv_fno_toplevel_reorder, [dnl
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@ -1,5 +1,5 @@
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/* Look up a symbol in the loaded objects.
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Copyright (C) 1995-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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Copyright (C) 1995-2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -72,6 +72,16 @@ struct sym_val
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#include "do-lookup.h"
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static uint_fast32_t
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dl_new_hash (const char *s)
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{
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uint_fast32_t h = 5381;
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for (unsigned char c = *s; c != '\0'; c = *++s)
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h = h * 33 + c;
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return h & 0xffffffff;
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}
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/* Add extra dependency on MAP to UNDEF_MAP. */
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static int
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internal_function
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@ -206,7 +216,8 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
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const struct r_found_version *version,
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int type_class, int flags, struct link_map *skip_map)
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{
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const unsigned long int hash = _dl_elf_hash (undef_name);
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const uint_fast32_t new_hash = dl_new_hash (undef_name);
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unsigned long int old_hash = 0xffffffff;
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struct sym_val current_value = { NULL, NULL };
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struct r_scope_elem **scope = symbol_scope;
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@ -229,8 +240,9 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
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/* Search the relevant loaded objects for a definition. */
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for (size_t start = i; *scope != NULL; start = 0, ++scope)
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{
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int res = do_lookup_x (undef_name, hash, *ref, ¤t_value, *scope,
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start, version, flags, skip_map, type_class);
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int res = do_lookup_x (undef_name, new_hash, &old_hash, *ref,
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¤t_value, *scope, start, version, flags,
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skip_map, type_class);
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if (res > 0)
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break;
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@ -301,9 +313,9 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
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struct sym_val protected_value = { NULL, NULL };
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for (scope = symbol_scope; *scope != NULL; i = 0, ++scope)
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if (do_lookup_x (undef_name, hash, *ref, &protected_value,
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*scope, i, version, flags, skip_map,
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ELF_RTYPE_CLASS_PLT) != 0)
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if (do_lookup_x (undef_name, new_hash, &old_hash, *ref,
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&protected_value, *scope, i, version, flags,
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skip_map, ELF_RTYPE_CLASS_PLT) != 0)
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break;
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if (protected_value.s != NULL && protected_value.m != undef_map)
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@ -352,6 +364,31 @@ _dl_setup_hash (struct link_map *map)
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Elf_Symndx *hash;
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Elf_Symndx nchain;
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if (__builtin_expect (map->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
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+ DT_THISPROCNUM + DT_VERSIONTAGNUM
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+ DT_EXTRANUM + DT_VALNUM] != NULL, 1))
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{
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Elf32_Word *hash32
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= (void *) D_PTR (map, l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
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+ DT_THISPROCNUM + DT_VERSIONTAGNUM
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+ DT_EXTRANUM + DT_VALNUM]);
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map->l_nbuckets = *hash32++;
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Elf32_Word symbias = *hash32++;
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Elf32_Word bitmask_nwords = *hash32++;
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/* Must be a power of two. */
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assert ((bitmask_nwords & (bitmask_nwords - 1)) == 0);
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map->l_gnu_bitmask_idxbits = bitmask_nwords - 1;
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map->l_gnu_shift = *hash32++;
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map->l_gnu_bitmask = (ElfW(Addr) *) hash32;
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hash32 += __ELF_NATIVE_CLASS / 32 * bitmask_nwords;
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|
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map->l_gnu_buckets = hash32;
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hash32 += map->l_nbuckets;
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map->l_gnu_chain_zero = hash32 - symbias;
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return;
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}
|
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|
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if (!map->l_info[DT_HASH])
|
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return;
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hash = (void *) D_PTR (map, l_info[DT_HASH]);
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@ -399,9 +436,10 @@ _dl_debug_bindings (const char *undef_name, struct link_map *undef_map,
|
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|| GLRO(dl_trace_prelink_map) == GL(dl_ns)[LM_ID_BASE]._ns_loaded)
|
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&& undef_map != GL(dl_ns)[LM_ID_BASE]._ns_loaded)
|
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{
|
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const unsigned long int hash = _dl_elf_hash (undef_name);
|
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const uint_fast32_t new_hash = dl_new_hash (undef_name);
|
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unsigned long int old_hash = 0xffffffff;
|
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|
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do_lookup_x (undef_name, hash, *ref, &val,
|
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do_lookup_x (undef_name, new_hash, &old_hash, *ref, &val,
|
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undef_map->l_local_scope[0], 0, version, 0, NULL,
|
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type_class);
|
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|
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|
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@ -1,5 +1,5 @@
|
||||
/* Miscellaneous support functions for dynamic linker
|
||||
Copyright (C) 1997-2002, 2003, 2004 Free Software Foundation, Inc.
|
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Copyright (C) 1997-2002, 2003, 2004, 2006 Free Software Foundation, Inc.
|
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This file is part of the GNU C Library.
|
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|
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The GNU C Library is free software; you can redistribute it and/or
|
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@ -308,7 +308,7 @@ _dl_dprintf (int fd, const char *fmt, ...)
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/* Test whether given NAME matches any of the names of the given object. */
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int
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internal_function
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_dl_name_match_p (const char *name, struct link_map *map)
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_dl_name_match_p (const char *name, const struct link_map *map)
|
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{
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if (strcmp (name, map->l_name) == 0)
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return 1;
|
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|
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256
elf/do-lookup.h
256
elf/do-lookup.h
@ -17,32 +17,29 @@
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
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|
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/* Inner part of the lookup functions. We return a value > 0 if we
|
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found the symbol, the value 0 if nothing is found and < 0 if
|
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something bad happened. */
|
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static int
|
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__attribute_noinline__
|
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do_lookup_x (const char *undef_name, unsigned long int hash,
|
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const ElfW(Sym) *ref, struct sym_val *result,
|
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struct r_scope_elem *scope, size_t i,
|
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do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
|
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unsigned long int *old_hash, const ElfW(Sym) *ref,
|
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struct sym_val *result, struct r_scope_elem *scope, size_t i,
|
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const struct r_found_version *const version, int flags,
|
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struct link_map *skip, int type_class)
|
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{
|
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struct link_map **list = scope->r_list;
|
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size_t n = scope->r_nlist;
|
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struct link_map *map;
|
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|
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do
|
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{
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const ElfW(Sym) *symtab;
|
||||
const char *strtab;
|
||||
const ElfW(Half) *verstab;
|
||||
/* These variables are used in the nested function. */
|
||||
Elf_Symndx symidx;
|
||||
const ElfW(Sym) *sym;
|
||||
int num_versions = 0;
|
||||
const ElfW(Sym) *versioned_sym = NULL;
|
||||
|
||||
map = list[i]->l_real;
|
||||
const struct link_map *map = list[i]->l_real;
|
||||
|
||||
/* Here come the extra test needed for `_dl_lookup_symbol_skip'. */
|
||||
if (map == skip)
|
||||
@ -63,109 +60,158 @@ do_lookup_x (const char *undef_name, unsigned long int hash,
|
||||
map->l_name[0] ? map->l_name : rtld_progname,
|
||||
map->l_ns);
|
||||
|
||||
symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
|
||||
strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
|
||||
verstab = map->l_versyms;
|
||||
/* If the hash table is empty there is nothing to do here. */
|
||||
if (map->l_nbuckets == 0)
|
||||
continue;
|
||||
|
||||
/* Search the appropriate hash bucket in this object's symbol table
|
||||
for a definition for the same symbol name. */
|
||||
for (symidx = map->l_buckets[hash % map->l_nbuckets];
|
||||
symidx != STN_UNDEF;
|
||||
symidx = map->l_chain[symidx])
|
||||
/* The tables for this map. */
|
||||
const ElfW(Sym) *symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
|
||||
const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
|
||||
|
||||
|
||||
/* Nested routine to check whether the symbol matches. */
|
||||
const ElfW(Sym) *
|
||||
__attribute_noinline__
|
||||
check_match (const ElfW(Sym) *sym)
|
||||
{
|
||||
assert (ELF_RTYPE_CLASS_PLT == 1);
|
||||
if (__builtin_expect ((sym->st_value == 0 /* No value. */
|
||||
&& ELFW(ST_TYPE) (sym->st_info) != STT_TLS)
|
||||
|| (type_class & (sym->st_shndx == SHN_UNDEF)),
|
||||
0))
|
||||
return NULL;
|
||||
|
||||
if (__builtin_expect (ELFW(ST_TYPE) (sym->st_info) > STT_FUNC
|
||||
&& ELFW(ST_TYPE) (sym->st_info) != STT_TLS, 0))
|
||||
/* Ignore all but STT_NOTYPE, STT_OBJECT and STT_FUNC
|
||||
entries (and STT_TLS if TLS is supported) since these
|
||||
are no code/data definitions. */
|
||||
return NULL;
|
||||
|
||||
if (sym != ref && strcmp (strtab + sym->st_name, undef_name))
|
||||
/* Not the symbol we are looking for. */
|
||||
return NULL;
|
||||
|
||||
const ElfW(Half) *verstab = map->l_versyms;
|
||||
if (version != NULL)
|
||||
{
|
||||
if (__builtin_expect (verstab == NULL, 0))
|
||||
{
|
||||
/* We need a versioned symbol but haven't found any. If
|
||||
this is the object which is referenced in the verneed
|
||||
entry it is a bug in the library since a symbol must
|
||||
not simply disappear.
|
||||
|
||||
It would also be a bug in the object since it means that
|
||||
the list of required versions is incomplete and so the
|
||||
tests in dl-version.c haven't found a problem.*/
|
||||
assert (version->filename == NULL
|
||||
|| ! _dl_name_match_p (version->filename, map));
|
||||
|
||||
/* Otherwise we accept the symbol. */
|
||||
}
|
||||
else
|
||||
{
|
||||
/* We can match the version information or use the
|
||||
default one if it is not hidden. */
|
||||
ElfW(Half) ndx = verstab[symidx] & 0x7fff;
|
||||
if ((map->l_versions[ndx].hash != version->hash
|
||||
|| strcmp (map->l_versions[ndx].name, version->name))
|
||||
&& (version->hidden || map->l_versions[ndx].hash
|
||||
|| (verstab[symidx] & 0x8000)))
|
||||
/* It's not the version we want. */
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No specific version is selected. There are two ways we
|
||||
can got here:
|
||||
|
||||
- a binary which does not include versioning information
|
||||
is loaded
|
||||
|
||||
- dlsym() instead of dlvsym() is used to get a symbol which
|
||||
might exist in more than one form
|
||||
|
||||
If the library does not provide symbol version information
|
||||
there is no problem at at: we simply use the symbol if it
|
||||
is defined.
|
||||
|
||||
These two lookups need to be handled differently if the
|
||||
library defines versions. In the case of the old
|
||||
unversioned application the oldest (default) version
|
||||
should be used. In case of a dlsym() call the latest and
|
||||
public interface should be returned. */
|
||||
if (verstab != NULL)
|
||||
{
|
||||
if ((verstab[symidx] & 0x7fff)
|
||||
>= ((flags & DL_LOOKUP_RETURN_NEWEST) ? 2 : 3))
|
||||
{
|
||||
/* Don't accept hidden symbols. */
|
||||
if ((verstab[symidx] & 0x8000) == 0
|
||||
&& num_versions++ == 0)
|
||||
/* No version so far. */
|
||||
versioned_sym = sym;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* There cannot be another entry for this symbol so stop here. */
|
||||
return sym;
|
||||
}
|
||||
|
||||
const ElfW(Sym) *sym;
|
||||
const ElfW(Addr) *bitmask = map->l_gnu_bitmask;
|
||||
if (__builtin_expect (bitmask != NULL, 1))
|
||||
{
|
||||
sym = &symtab[symidx];
|
||||
ElfW(Addr) bitmask_word
|
||||
= bitmask[(new_hash / __ELF_NATIVE_CLASS)
|
||||
& map->l_gnu_bitmask_idxbits];
|
||||
|
||||
assert (ELF_RTYPE_CLASS_PLT == 1);
|
||||
if ((sym->st_value == 0 /* No value. */
|
||||
#ifdef USE_TLS
|
||||
&& ELFW(ST_TYPE) (sym->st_info) != STT_TLS
|
||||
#endif
|
||||
)
|
||||
|| (type_class & (sym->st_shndx == SHN_UNDEF)))
|
||||
continue;
|
||||
unsigned int hashbit1 = new_hash & (__ELF_NATIVE_CLASS - 1);
|
||||
unsigned int hashbit2 = ((new_hash >> map->l_gnu_shift)
|
||||
& (__ELF_NATIVE_CLASS - 1));
|
||||
|
||||
if (ELFW(ST_TYPE) (sym->st_info) > STT_FUNC
|
||||
#ifdef USE_TLS
|
||||
&& ELFW(ST_TYPE) (sym->st_info) != STT_TLS
|
||||
#endif
|
||||
)
|
||||
/* Ignore all but STT_NOTYPE, STT_OBJECT and STT_FUNC
|
||||
entries (and STT_TLS if TLS is supported) since these
|
||||
are no code/data definitions. */
|
||||
continue;
|
||||
|
||||
if (sym != ref && strcmp (strtab + sym->st_name, undef_name))
|
||||
/* Not the symbol we are looking for. */
|
||||
continue;
|
||||
|
||||
if (version != NULL)
|
||||
if (__builtin_expect ((bitmask_word >> hashbit1)
|
||||
& (bitmask_word >> hashbit2) & 1, 0))
|
||||
{
|
||||
if (__builtin_expect (verstab == NULL, 0))
|
||||
Elf32_Word bucket = map->l_gnu_buckets[new_hash
|
||||
% map->l_nbuckets];
|
||||
if (bucket != 0)
|
||||
{
|
||||
/* We need a versioned symbol but haven't found any. If
|
||||
this is the object which is referenced in the verneed
|
||||
entry it is a bug in the library since a symbol must
|
||||
not simply disappear.
|
||||
const Elf32_Word *hasharr = &map->l_gnu_chain_zero[bucket];
|
||||
|
||||
It would also be a bug in the object since it means that
|
||||
the list of required versions is incomplete and so the
|
||||
tests in dl-version.c haven't found a problem.*/
|
||||
assert (version->filename == NULL
|
||||
|| ! _dl_name_match_p (version->filename, map));
|
||||
|
||||
/* Otherwise we accept the symbol. */
|
||||
}
|
||||
else
|
||||
{
|
||||
/* We can match the version information or use the
|
||||
default one if it is not hidden. */
|
||||
ElfW(Half) ndx = verstab[symidx] & 0x7fff;
|
||||
if ((map->l_versions[ndx].hash != version->hash
|
||||
|| strcmp (map->l_versions[ndx].name, version->name))
|
||||
&& (version->hidden || map->l_versions[ndx].hash
|
||||
|| (verstab[symidx] & 0x8000)))
|
||||
/* It's not the version we want. */
|
||||
continue;
|
||||
do
|
||||
if ((*hasharr & ~1u) == (new_hash & ~1u))
|
||||
{
|
||||
symidx = hasharr - map->l_gnu_chain_zero;
|
||||
sym = check_match (&symtab[symidx]);
|
||||
if (sym != NULL)
|
||||
goto found_it;
|
||||
}
|
||||
while ((*hasharr++ & 1u) == 0);
|
||||
}
|
||||
}
|
||||
else
|
||||
}
|
||||
else
|
||||
{
|
||||
if (*old_hash == 0xffffffff)
|
||||
*old_hash = _dl_elf_hash (undef_name);
|
||||
|
||||
/* Use the old SysV-style hash table. Search the appropriate
|
||||
hash bucket in this object's symbol table for a definition
|
||||
for the same symbol name. */
|
||||
for (symidx = map->l_buckets[*old_hash % map->l_nbuckets];
|
||||
symidx != STN_UNDEF;
|
||||
symidx = map->l_chain[symidx])
|
||||
{
|
||||
/* No specific version is selected. There are two ways we
|
||||
can got here:
|
||||
|
||||
- a binary which does not include versioning information
|
||||
is loaded
|
||||
|
||||
- dlsym() instead of dlvsym() is used to get a symbol which
|
||||
might exist in more than one form
|
||||
|
||||
If the library does not provide symbol version
|
||||
information there is no problem at at: we simply use the
|
||||
symbol if it is defined.
|
||||
|
||||
These two lookups need to be handled differently if the
|
||||
library defines versions. In the case of the old
|
||||
unversioned application the oldest (default) version
|
||||
should be used. In case of a dlsym() call the latest and
|
||||
public interface should be returned. */
|
||||
if (verstab != NULL)
|
||||
{
|
||||
if ((verstab[symidx] & 0x7fff)
|
||||
>= ((flags & DL_LOOKUP_RETURN_NEWEST) ? 2 : 3))
|
||||
{
|
||||
/* Don't accept hidden symbols. */
|
||||
if ((verstab[symidx] & 0x8000) == 0
|
||||
&& num_versions++ == 0)
|
||||
/* No version so far. */
|
||||
versioned_sym = sym;
|
||||
|
||||
continue;
|
||||
}
|
||||
}
|
||||
sym = check_match (&symtab[symidx]);
|
||||
if (sym != NULL)
|
||||
goto found_it;
|
||||
}
|
||||
|
||||
/* There cannot be another entry for this symbol so stop here. */
|
||||
goto found_it;
|
||||
}
|
||||
|
||||
/* If we have seen exactly one versioned symbol while we are
|
||||
@ -186,7 +232,7 @@ do_lookup_x (const char *undef_name, unsigned long int hash,
|
||||
if (! result->s)
|
||||
{
|
||||
result->s = sym;
|
||||
result->m = map;
|
||||
result->m = (struct link_map *) map;
|
||||
}
|
||||
break;
|
||||
}
|
||||
@ -194,7 +240,7 @@ do_lookup_x (const char *undef_name, unsigned long int hash,
|
||||
case STB_GLOBAL:
|
||||
/* Global definition. Just what we need. */
|
||||
result->s = sym;
|
||||
result->m = map;
|
||||
result->m = (struct link_map *) map;
|
||||
return 1;
|
||||
default:
|
||||
/* Local symbols are ignored. */
|
||||
@ -213,7 +259,3 @@ do_lookup_x (const char *undef_name, unsigned long int hash,
|
||||
/* We have not found anything until now. */
|
||||
return 0;
|
||||
}
|
||||
|
||||
#undef FCT
|
||||
#undef ARG
|
||||
#undef VERSIONED
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
/* Inline functions for dynamic linking.
|
||||
Copyright (C) 1995-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
|
||||
Copyright (C) 1995-2005, 2006 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
@ -143,6 +143,8 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
|
||||
# endif
|
||||
ADJUST_DYN_INFO (DT_JMPREL);
|
||||
ADJUST_DYN_INFO (VERSYMIDX (DT_VERSYM));
|
||||
ADJUST_DYN_INFO (DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM + DT_THISPROCNUM
|
||||
+ DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM);
|
||||
# undef ADJUST_DYN_INFO
|
||||
assert (cnt <= DL_RO_DYN_TEMP_CNT);
|
||||
}
|
||||
|
||||
@ -329,7 +329,8 @@ typedef struct
|
||||
#define SHT_GROUP 17 /* Section group */
|
||||
#define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */
|
||||
#define SHT_NUM 19 /* Number of defined types. */
|
||||
#define SHT_LOOS 0x60000000 /* Start OS-specific */
|
||||
#define SHT_LOOS 0x60000000 /* Start OS-specific. */
|
||||
#define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table. */
|
||||
#define SHT_GNU_LIBLIST 0x6ffffff7 /* Prelink library list */
|
||||
#define SHT_CHECKSUM 0x6ffffff8 /* Checksum for DSO content. */
|
||||
#define SHT_LOSUNW 0x6ffffffa /* Sun-specific low bound. */
|
||||
@ -699,6 +700,9 @@ typedef struct
|
||||
If any adjustment is made to the ELF object after it has been
|
||||
built these entries will need to be adjusted. */
|
||||
#define DT_ADDRRNGLO 0x6ffffe00
|
||||
#define DT_GNU_HASH 0x6ffffef5 /* GNU-style hash table. */
|
||||
#define DT_TLSDESC_PLT 0x6ffffef6
|
||||
#define DT_TLSDESC_GOT 0x6ffffef7
|
||||
#define DT_GNU_CONFLICT 0x6ffffef8 /* Start of conflict section */
|
||||
#define DT_GNU_LIBLIST 0x6ffffef9 /* Library list */
|
||||
#define DT_CONFIG 0x6ffffefa /* Configuration information. */
|
||||
@ -709,7 +713,7 @@ typedef struct
|
||||
#define DT_SYMINFO 0x6ffffeff /* Syminfo table. */
|
||||
#define DT_ADDRRNGHI 0x6ffffeff
|
||||
#define DT_ADDRTAGIDX(tag) (DT_ADDRRNGHI - (tag)) /* Reverse order! */
|
||||
#define DT_ADDRNUM 10
|
||||
#define DT_ADDRNUM 11
|
||||
|
||||
/* The versioning entry types. The next are defined as part of the
|
||||
GNU extension. */
|
||||
|
||||
@ -124,7 +124,7 @@ struct link_map
|
||||
const ElfW(Phdr) *l_phdr; /* Pointer to program header table in core. */
|
||||
ElfW(Addr) l_entry; /* Entry point location. */
|
||||
ElfW(Half) l_phnum; /* Number of program header entries. */
|
||||
ElfW(Half) l_ldnum; /* Number of dynamic segment entries. */
|
||||
ElfW(Half) l_ldnum; /* Number of dynamic segment entries. */
|
||||
|
||||
/* Array of DT_NEEDED dependencies and their dependencies, in
|
||||
dependency order for symbol lookup (with and without
|
||||
@ -141,7 +141,19 @@ struct link_map
|
||||
|
||||
/* Symbol hash table. */
|
||||
Elf_Symndx l_nbuckets;
|
||||
const Elf_Symndx *l_buckets, *l_chain;
|
||||
Elf32_Word l_gnu_bitmask_idxbits;
|
||||
Elf32_Word l_gnu_shift;
|
||||
const ElfW(Addr) *l_gnu_bitmask;
|
||||
union
|
||||
{
|
||||
const Elf32_Word *l_gnu_buckets;
|
||||
const Elf_Symndx *l_chain;
|
||||
};
|
||||
union
|
||||
{
|
||||
const Elf32_Word *l_gnu_chain_zero;
|
||||
const Elf_Symndx *l_buckets;
|
||||
};
|
||||
|
||||
unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose. */
|
||||
enum /* Where this object came from. */
|
||||
|
||||
@ -41,7 +41,8 @@ __pthread_mutex_init (mutex, mutexattr)
|
||||
imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr;
|
||||
|
||||
/* Sanity checks. */
|
||||
// XXX For now we don't support priority protected mutexes.
|
||||
// XXX For now we don't support priority inherited or priority protected
|
||||
// XXX mutexes.
|
||||
switch (__builtin_expect (imutexattr->mutexkind
|
||||
& PTHREAD_MUTEXATTR_PROTOCOL_MASK,
|
||||
PTHREAD_PRIO_NONE
|
||||
@ -50,13 +51,6 @@ __pthread_mutex_init (mutex, mutexattr)
|
||||
case PTHREAD_PRIO_NONE << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
|
||||
break;
|
||||
|
||||
case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
|
||||
#ifndef __ASSUME_SET_ROBUST_LIST
|
||||
if (__set_robust_list_avail < 0)
|
||||
return ENOTSUP;
|
||||
#endif
|
||||
break;
|
||||
|
||||
default:
|
||||
return ENOTSUP;
|
||||
}
|
||||
@ -81,11 +75,11 @@ __pthread_mutex_init (mutex, mutexattr)
|
||||
switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
|
||||
{
|
||||
case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP;
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_PRIVATE_NP;
|
||||
break;
|
||||
|
||||
case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP;
|
||||
mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_PRIVATE_NP;
|
||||
if (PTHREAD_MUTEX_PRIO_CEILING_MASK
|
||||
== PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
|
||||
mutex->__data.__kind |= (imutexattr->mutexkind
|
||||
|
||||
@ -331,7 +331,7 @@ struct audit_ifaces
|
||||
|
||||
|
||||
/* Test whether given NAME matches any of the names of the given object. */
|
||||
extern int _dl_name_match_p (const char *__name, struct link_map *__map)
|
||||
extern int _dl_name_match_p (const char *__name, const struct link_map *__map)
|
||||
internal_function;
|
||||
|
||||
/* Function used as argument for `_dl_receive_error' function. The
|
||||
|
||||
Loading…
Reference in New Issue
Block a user