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43d06ed218
glibc/sysdeps/aarch64
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Fangrui Song 43d06ed218 aarch64: Make elf_machine_{load_address,dynamic} robust [BZ #28203] 
The AArch64 ABI is largely platform agnostic and does not specify
_GLOBAL_OFFSET_TABLE_[0] ([1]). glibc ld.so turns out to be probably the
only user of _GLOBAL_OFFSET_TABLE_[0] and GNU ld defines the value
to the link-time address _DYNAMIC. [2]

In 2012, __ehdr_start was implemented in GNU ld and gold in binutils
2.23.  Using adrp+add / (-mcmodel=tiny) adr to access
__ehdr_start/_DYNAMIC gives us a robust way to get the load address and
the link-time address of _DYNAMIC.

[1]: From a psABI maintainer, https://bugs.llvm.org/show_bug.cgi?id=49672#c2
[2]: LLD's aarch64 port does not set _GLOBAL_OFFSET_TABLE_[0] to the
link-time address _DYNAMIC.
LLD is widely used on aarch64 Android and ChromeOS devices.  Software
just works without the need for _GLOBAL_OFFSET_TABLE_[0].

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
2021-08-11 09:00:38 -07:00
..
bits Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fpu Update math: redirect roundeven function 2021-06-27 07:56:57 -07:00
multiarch [5/5] AArch64: Improve A64FX memset medium loops 2021-08-10 13:46:20 +01:00
nptl Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sys Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
__longjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
__mtag_tag_region.S aarch64: Optimize __libc_mtag_tag_region 2021-03-26 11:03:06 +00:00
__mtag_tag_zero_region.S aarch64: Optimize __libc_mtag_tag_zero_region 2021-03-26 11:03:06 +00:00
abort-instr.h
atomic-machine.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -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 config: Added HAVE_AARCH64_SVE_ASM for aarch64 2021-05-26 12:01:06 +01:00
configure.ac config: Added HAVE_AARCH64_SVE_ASM for aarch64 2021-05-26 12:01:06 +01:00
crti.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
crtn.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-bti.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-irel.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-link.sym
dl-lookupcfg.h aarch64: free tlsdesc data on dlclose [BZ #27403] 2021-04-06 14:35:05 +01:00
dl-machine.h aarch64: Make elf_machine_{load_address,dynamic} robust [BZ #28203] 2021-08-11 09:00:38 -07:00
dl-prop.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tlsdesc.S aarch64: push the set of rules before falling into slow path 2021-01-05 09:25:19 +00:00
dl-trampoline.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
dl-tunables.list Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
e_sqrtl.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
elf-initfini.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
hp-timing.h AArch64: Add hp-timing.h 2021-07-01 15:42:05 +01:00
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 2021-01-02 12:17:34 -08:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ldsodefs.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libc-mtag.h aarch64: inline __libc_mtag_new_tag 2021-03-26 11:03:06 +00:00
libc-tls.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
libm-test-ulps aarch64: update libm test ulps 2021-04-08 08:24:30 +01:00
libm-test-ulps-name
linkmap.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
Makefile glibc.malloc.check: Wean away from malloc hooks 2021-07-22 18:38:08 +05:30
math-tests-trap.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
mcount.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memcmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memcpy.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -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 2021-01-02 12:17:34 -08:00
memset-reg.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memset.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
memusage.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
preconfigure
rawmemchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
setjmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sfp-machine.h
sotruss-lib.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
stackinfo.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
start.S Reduce the statically linked startup code [BZ #23323] 2021-02-25 12:13:02 +01:00
stpcpy.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strchrnul.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strcmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strcpy.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
string_private.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strlen.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strncmp.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
strnlen.S AArch64: Improve strnlen performance 2021-07-01 15:32:36 +01:00
strrchr.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sysdep.h aarch64: define BTI_C and BTI_J macros as NOP unless HAVE_AARCH64_BTI 2021-05-26 12:01:06 +01:00
tls-macros.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tlsdesc.c elf: Remove lazy tlsdesc relocation related code 2021-04-21 14:35:53 +01:00
tlsdesc.sym
tst-audit.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ifunc-arg-1.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-ifunc-arg-2.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-vpcs-mod.S Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-vpcs.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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