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glibc/sysdeps/generic
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Florian Weimer ec935dea63 elf: Implement __libc_early_init 
This function is defined in libc.so, and the dynamic loader calls
right after relocation has been finished, before any ELF constructors
or the preinit function is invoked.  It is also used in the static
build for initializing parts of the static libc.

To locate __libc_early_init, a direct symbol lookup function is used,
_dl_lookup_direct.  It does not search the entire symbol scope and
consults merely a single link map.  This function could also be used
to implement lookups in the vDSO (as an optimization).

A per-namespace variable (libc_map) is added for locating libc.so,
to avoid repeated traversals of the search scope.  It is similar to
GL(dl_initfirst).  An alternative would have been to thread a context
argument from _dl_open down to _dl_map_object_from_fd (where libc.so
is identified).  This could have avoided the global variable, but
the change would be larger as a result.  It would not have been
possible to use this to replace GL(dl_initfirst) because that global
variable is used to pass the function pointer past the stack switch
from dl_main to the main program.  Replacing that requires adding
a new argument to _dl_init, which in turn needs changes to the
architecture-specific libc.so startup code written in assembler.

__libc_early_init should not be used to replace _dl_var_init (as
it exists today on some architectures).  Instead, _dl_lookup_direct
should be used to look up a new variable symbol in libc.so, and
that should then be initialized from the dynamic loader, immediately
after the object has been loaded in _dl_map_object_from_fd (before
relocation is run).  This way, more IFUNC resolvers which depend on
these variables will work.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2020-04-24 22:32:09 +02:00
..
net Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
netinet Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
nfs Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sys Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
_G_config.h Post-cleanup 2: minimize _G_config.h. 2018-02-07 10:10:32 -05:00
_itoa.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
a.out.h
abort-instr.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
adaptive_spin_count.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
aio_misc.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
allocalim.h Update. 2002-10-09 09:42:48 +00:00
arch-fd_to_filename.h <fd_to_filename.h>: Add type safety and port to Hurd 2020-02-18 13:42:29 +01:00
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
c++-types.data Add placeholder c++-types.data and *.abilist files. 2015-02-13 15:41:34 -08:00
confstr.h
crti.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
crtn.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
device-nrs.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dirstream.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-auxv.h powerpc: Move cache line size to rtld_global_ro 2020-01-17 09:05:03 -03:00
dl-cache.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-dtv.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-fcntl.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-fileid.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-fptr.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-hash.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-irel.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-librecon.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-machine.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-mman.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-osinfo.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-procinfo.c Dummy dl-procinfo.c file for platforms which don't have one. 2002-02-01 18:25:44 +00:00
dl-procinfo.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-procruntime.c ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
dl-prop.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-tls.h Update. 2002-02-07 04:08:19 +00:00
dl-unistd.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
dl-vdso-setup.c elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
dl-vdso-setup.h elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
dl-vdso.h elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
dwarf2.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
elf_machine_sym_no_match.h elf: Introduce <elf_machine_sym_no_match.h> 2020-04-24 22:13:03 +02:00
elf-initfini.h Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
elide.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
eloop-threshold.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
entry.h Update. 2002-03-15 03:16:52 +00:00
errqueue.h
exit-thread.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
fd_to_filename.h <fd_to_filename.h>: Add type safety and port to Hurd 2020-02-18 13:42:29 +01:00
fenv_private.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
fips-private.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
fix-fp-int-compare-invalid.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
fix-fp-int-convert-overflow.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
float128-abi.h Move some float128 symbol version definitions. 2017-10-16 22:04:42 +00:00
fork.h Update. 2002-10-01 00:05:23 +00:00
fpu_control.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
framestate.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
gcc-compat.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
get-rounding-mode.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
hp-timing-common.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
hp-timing.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ifreq.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ifunc-init.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ifunc-sel.h Do not stack-protect ifunc resolvers [BZ #7065] 2016-12-26 10:08:41 +01:00
internal-signals.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
intr-msg.h
ld.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
ldbl-classify-compat.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ldconfig.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ldsodefs.h elf: Implement __libc_early_init 2020-04-24 22:32:09 +02:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc-lock.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libc-mmap.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libc-start.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libc-tsd.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libc.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm-alias-double.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libm-alias-float128.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libm-alias-float.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libm-alias-ldouble.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
libm-test-ulps Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-ulps-name Do not hardcode platform names in manual/libm-err-tab.pl (bug 14139). 2016-11-04 16:49:06 +00:00
libm.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libnsl.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
libnss_compat.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_db.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_dns.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_files.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_hesiod.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nis.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nisplus.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
link_map.h ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
linkmap.h Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
local-setxid.h * sysdeps/posix/spawni.c (__spawni): Use local_seteuid and 2006-06-04 22:17:06 +00:00
localplt.data ld.so: Do not export free/calloc/malloc/realloc functions [BZ #25486] 2020-02-15 11:01:23 +01:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
machine-lock.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
machine-sp.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
Makefile Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
malloc-alignment.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
malloc-machine.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
malloc-sysdep.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math_ldbl_opt.h Use PRINTF_LDBL_IS_DBL instead of __ldbl_is_dbl. 2018-12-05 18:15:43 -02:00
math_ldbl.h Allow direct use of math_ldbl.h in testsuite. 2017-02-25 10:40:48 -05:00
math_private_calls.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math_private.h Enable inlining issignalingf within glibc 2019-11-21 09:39:48 -06:00
math-barriers.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-nan-payload-double.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-nan-payload-float.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-narrow-alias-float128.h ldbl-128ibm-compat: Provide ieee128 symbols to narrow functions 2020-02-20 17:12:14 -06:00
math-tests-arch.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-exceptions.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-rounding.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-snan-cast.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-snan-payload.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-snan.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-trap-force.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests-trap.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-tests.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-type-macros-double.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-type-macros-float128.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-type-macros-float.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-type-macros-ldouble.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
math-type-macros.h Add libm_alias_finite for _finite symbols 2020-01-03 10:02:04 -03:00
math-use-builtins.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
memcopy.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
mmap_info.h posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
not-cancel.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
not-errno.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
nscd-types.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pagecopy.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
paths.h generic paths.h: remove old paths from _PATH_STDPATH 2012-11-04 10:11:39 +01:00
profil-counter.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pty-private.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
register-dump.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
rtld-lowlevel.h Jakub Jelinek <jakub@redhat.com> 2006-10-10 00:51:29 +00:00
safe-fatal.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setjmpP.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
siglist.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigset-cvt-mask.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigsetops.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
single-thread.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
stackguard-macros.h BZ #15754: Fix test case for ARM. 2013-09-23 01:44:38 -04:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
stap-probe-machine.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
startup.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
stdio-lock.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
string_private.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
symbol-hacks.h Break more lines before not after operators. 2019-02-25 13:19:19 +00:00
sysdep-cancel.h nptl: Remove tst-cancel-wrappers test and related macros 2019-01-03 18:38:08 -02:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
thread_state.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
time-clockid.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tininess.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tls-macros.h * elf/tls-macros.h: #include_next <tls-macros.h> to get a sysdeps 2005-03-13 09:09:05 +00:00
tls-setup.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tls.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-audit.h Move testsuite audit definitions to sysdeps tst-audit.h files. 2012-07-26 11:29:07 +00:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unsecvars.h Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug #21209) 2017-03-07 20:52:04 +05:30
unwind-arch.h mips: Fix bracktrace result for signal frames 2020-02-18 10:39:03 -03:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind-dw2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind-pe.c Update. 2004-03-10 10:04:19 +00:00
unwind-pe.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind-resume.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unwind.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
utmp-equal.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00