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b19de59d62
dynamic-link.h is included more than once in some elf/ files (rtld.c,
dl-conflict.c, dl-reloc.c, dl-reloc-static-pie.c) and uses GCC nested
functions. This harms readability and the nested functions usage
is the biggest obstacle prevents Clang build (Clang doesn't support GCC
nested functions).
The key idea for unnesting is to add extra parameters (struct link_map
*and struct r_scope_elm *[]) to RESOLVE_MAP,
ELF_MACHINE_BEFORE_RTLD_RELOC, ELF_DYNAMIC_RELOCATE, elf_machine_rel[a],
elf_machine_lazy_rel, and elf_machine_runtime_setup. (This is inspired
by Stan Shebs' ppc64/x86-64 implementation in the
google/grte/v5-2.27/master which uses mixed extra parameters and static
variables.)
Future simplification:
* If mips elf_machine_runtime_setup no longer needs RESOLVE_GOTSYM,
elf_machine_runtime_setup can drop the `scope` parameter.
* If TLSDESC no longer need to be in elf_machine_lazy_rel,
elf_machine_lazy_rel can drop the `scope` parameter.
Tested on aarch64, i386, x86-64, powerpc64le, powerpc64, powerpc32,
sparc64, sparcv9, s390x, s390, hppa, ia64, armhf, alpha, and mips64.
In addition, tested build-many-glibcs.py with {arc,csky,microblaze,nios2}-linux-gnu
and riscv64-linux-gnu-rv64imafdc-lp64d.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 490e6c62aa)
78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/* Resolve conflicts against already prelinked libraries.
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Copyright (C) 2001-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <libintl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include "dynamic-link.h"
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/* Used at loading time solely for prelink executable. It is not called
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concurrently so it is be safe to defined as static. */
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static struct link_map *resolve_conflict_map __attribute__ ((__unused__));
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/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
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#define RESOLVE_MAP(map, scope, ref, version, flags) (*ref = NULL, NULL)
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#define RESOLVE(ref, version, flags) (*ref = NULL, 0)
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#define RESOLVE_CONFLICT_FIND_MAP(map, r_offset) \
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do { \
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while ((resolve_conflict_map->l_map_end < (ElfW(Addr)) (r_offset)) \
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|| (resolve_conflict_map->l_map_start > (ElfW(Addr)) (r_offset))) \
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resolve_conflict_map = resolve_conflict_map->l_next; \
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\
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(map) = resolve_conflict_map; \
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} while (0)
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#include "dynamic-link.h"
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void
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_dl_resolve_conflicts (struct link_map *l, ElfW(Rela) *conflict,
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ElfW(Rela) *conflictend)
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{
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#if ! ELF_MACHINE_NO_RELA
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if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_RELOC))
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_dl_debug_printf ("\nconflict processing: %s\n", DSO_FILENAME (l->l_name));
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{
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/* Do the conflict relocation of the object and library GOT and other
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data. */
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/* Prelinking makes no sense for anything but the main namespace. */
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assert (l->l_ns == LM_ID_BASE);
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resolve_conflict_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
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/* Override these, defined in dynamic-link.h. */
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#undef CHECK_STATIC_TLS
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#define CHECK_STATIC_TLS(ref_map, sym_map) ((void) 0)
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#undef TRY_STATIC_TLS
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#define TRY_STATIC_TLS(ref_map, sym_map) (0)
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GL(dl_num_cache_relocations) += conflictend - conflict;
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for (; conflict < conflictend; ++conflict)
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elf_machine_rela (l, NULL, conflict, NULL, NULL,
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(void *) conflict->r_offset, 0);
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}
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#endif
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}
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