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authorFangrui Song <maskray@google.com>2022-05-23 13:37:05 -0700
committerFangrui Song <maskray@google.com>2022-05-23 13:37:05 -0700
commite555954e026df1b85b8ef6c101d05f97b1520d7e (patch)
tree798159309b7d8a8dbed27f7e40fb999d6fa6b0cd /sysdeps/aarch64/dl-sysdep.h
parenta8b11bd1f8dc68795b377138b5d94638ef75a50d (diff)
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Revert "[AArch64][BZ #17711] Fix extern protected data handling"
This reverts commit 0910702c4d2cf9e8302b35c9519548726e1ac489. 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>
Diffstat (limited to 'sysdeps/aarch64/dl-sysdep.h')
-rw-r--r--sysdeps/aarch64/dl-sysdep.h21
1 files changed, 0 insertions, 21 deletions
diff --git a/sysdeps/aarch64/dl-sysdep.h b/sysdeps/aarch64/dl-sysdep.h
deleted file mode 100644
index 1516dd7..0000000
--- a/sysdeps/aarch64/dl-sysdep.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/* Copyright (C) 2002-2022 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
- modify it under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#include_next <dl-sysdep.h>
-
-#define DL_EXTERN_PROTECTED_DATA