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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-10-13 09:49:34 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-10-14 14:52:07 -0300 |
| commit | d6d89608ac8cf2b37c75debad1fff653f6939f90 (patch) | |
| tree | 963c9d77032467e0b4af4f274979de09bd5c054e /sysdeps/generic | |
| parent | e59ced238482fd71f3e493717f14f6507346741e (diff) | |
| download | glibc-d6d89608ac8cf2b37c75debad1fff653f6939f90.zip glibc-d6d89608ac8cf2b37c75debad1fff653f6939f90.tar.gz glibc-d6d89608ac8cf2b37c75debad1fff653f6939f90.tar.bz2 | |
elf: Fix dynamic-link.h usage on rtld.c
The 4af6982e4c fix does not fully handle RTLD_BOOTSTRAP usage on
rtld.c due two issues:
1. RTLD_BOOTSTRAP is also used on dl-machine.h on various
architectures and it changes the semantics of various machine
relocation functions.
2. The elf_get_dynamic_info() change was done sideways, previously
to 490e6c62aa get-dynamic-info.h was included by the first
dynamic-link.h include *without* RTLD_BOOTSTRAP being defined.
It means that the code within elf_get_dynamic_info() that uses
RTLD_BOOTSTRAP is in fact unused.
To fix 1. this patch now includes dynamic-link.h only once with
RTLD_BOOTSTRAP defined. The ELF_DYNAMIC_RELOCATE call will now have
the relocation fnctions with the expected semantics for the loader.
And to fix 2. part of 4af6982e4c is reverted (the check argument
elf_get_dynamic_info() is not required) and the RTLD_BOOTSTRAP
pieces are removed.
To reorganize the includes the static TLS definition is moved to
its own header to avoid a circular dependency (it is defined on
dynamic-link.h and dl-machine.h requires it at same time other
dynamic-link.h definition requires dl-machine.h defitions).
Also ELF_MACHINE_NO_REL, ELF_MACHINE_NO_RELA, and ELF_MACHINE_PLT_REL
are moved to its own header. Only ancient ABIs need special values
(arm, i386, and mips), so a generic one is used as default.
The powerpc Elf64_FuncDesc is also moved to its own header, since
csu code required its definition (which would require either include
elf/ folder or add a full path with elf/).
Checked on x86_64, i686, aarch64, armhf, powerpc64, powerpc32,
and powerpc64le.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/dl-machine-rel.h | 27 | ||||
| -rw-r--r-- | sysdeps/generic/dl-machine.h | 2 |
2 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/generic/dl-machine-rel.h b/sysdeps/generic/dl-machine-rel.h new file mode 100644 index 0000000..9167a1d --- /dev/null +++ b/sysdeps/generic/dl-machine-rel.h @@ -0,0 +1,27 @@ +/* ELF dynamic relocation type supported by the architecture. + Copyright (C) 2001-2021 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/>. */ + +#ifndef _DL_MACHINE_REL_H +#define _DL_MACHINE_REL_H + +/* Defined if the architecture supports Elf{32,64}_Rel relocations. */ +#define ELF_MACHINE_NO_REL 1 +/* Defined if the architecture supports Elf{32,64}_Rela relocations. */ +#define ELF_MACHINE_NO_RELA 0 + +#endif diff --git a/sysdeps/generic/dl-machine.h b/sysdeps/generic/dl-machine.h index 4a4ab4f..7da695d 100644 --- a/sysdeps/generic/dl-machine.h +++ b/sysdeps/generic/dl-machine.h @@ -20,6 +20,8 @@ #include <string.h> #include <link.h> +#include <dl-static-tls.h> +#include <dl-machine-rel.h> /* Return nonzero iff ELF header is compatible with the running host. */ |