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glibc/sysdeps/aarch64
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Fangrui Song e555954e02 Revert "[AArch64][BZ #17711] Fix extern protected data handling" 
This reverts commit 0910702c4d.

Say both a.so and b.so define protected data symbol `var` and the executable
copy relocates var.  ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA has strange
semantics: a.so accesses the copy in the executable while b.so accesses its
own.  This behavior requires that (a) the compiler emits GOT-generating
relocations (b) the linker produces GLOB_DAT instead of RELATIVE.

Without the ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA code, b.so's GLOB_DAT
will bind to the executable (normal behavior).

For aarch64 it makes sense to restore the original behavior and don't
pay the ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA cost.  The behavior is very
unlikely used by anyone.

* Clang code generator treats STV_PROTECTED the same way as STV_HIDDEN:
  no GOT-generating relocation in the first place.
* gold and lld reject copy relocation on a STV_PROTECTED symbol.
* Nowadays -fpie/-fpic modes are popular.  GCC/Clang's codegen uses
  GOT-generating relocation when accessing an default visibility
  external symbol which avoids copy relocation.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2022-05-23 13:37:05 -07:00
..
bits elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
fpu Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
multiarch AArch64: Check for SVE in ifuncs [BZ #28744] 2022-01-06 14:36:28 +00:00
nptl Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sys Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
__longjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
__mtag_tag_region.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
__mtag_tag_zero_region.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
abort-instr.h
atomic-machine.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
bsd-_setjmp.c aarch64: Rename place holder .S files to .c 2020-07-08 15:02:37 +01:00
bsd-setjmp.c aarch64: Rename place holder .S files to .c 2020-07-08 15:02:37 +01:00
configure elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 2022-04-26 09:26:22 -07:00
configure.ac elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 2022-04-26 09:26:22 -07:00
crti.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
crtn.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-audit-check.h elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
dl-bti.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-irel.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-link.sym elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-machine.h Revert "[AArch64][BZ #17711] Fix extern protected data handling" 2022-05-23 13:37:05 -07:00
dl-prop.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-start.S aarch64: Move ld.so _start to separate file and drop _dl_skip_args 2022-05-17 10:14:03 +01:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-tlsdesc.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-trampoline.S elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
dl-tunables.list Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
e_sqrtl.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
elf-initfini.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
hp-timing.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
Implies Remove dbl-64/wordsize-64 (part 2) 2021-01-07 15:26:26 +00:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
ldsodefs.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libc-mtag.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libc-tls.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libm-test-ulps aarch64: update libm test ulps 2021-10-05 13:44:27 +01:00
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
linkmap.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
Makefile aarch64: Move ld.so _start to separate file and drop _dl_skip_args 2022-05-17 10:14:03 +01:00
math-tests-trap.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
mcount.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcpy.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memmove.c aarch64: Rename place holder .S files to .c 2020-07-08 15:02:37 +01:00
memrchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memset-reg.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memset.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
preconfigure
rawmemchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
setjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sfp-machine.h Break more lines before not after operators. 2019-02-25 13:19:19 +00:00
sotruss-lib.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stackinfo.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
start.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stpcpy.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strchrnul.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strcmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strcpy.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
string_private.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strlen.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strncmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strnlen.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strrchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sysdep.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tlsdesc.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tlsdesc.sym aarch64: Use explicit offsets in _dl_tlsdesc_dynamic 2016-12-02 16:52:57 +01:00
tst-audit26.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit26mod.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit26mod.h elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit27.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit27mod.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit27mod.h elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-audit.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-auditmod26.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-auditmod27.c elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
tst-ifunc-arg-1.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-ifunc-arg-2.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-vpcs-mod.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-vpcs.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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