elf: Remove prelink support

Prelinked binaries and libraries still work, the dynamic tags
DT_GNU_PRELINKED, DT_GNU_LIBLIST, DT_GNU_CONFLICT just ignored
(meaning the process is reallocated as default).

The loader environment variable TRACE_PRELINKING is also removed,
since it used solely on prelink.

Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 0 insertions, 77 deletions

diff --git a/elf/dl-conflict.c b/elf/dl-conflict.c
deleted file mode 100644
index 769afd581b..0000000000
--- a/elf/dl-conflict.c
+++ /dev/null
@@ -1,77 +0,0 @@
-/* Resolve conflicts against already prelinked libraries.
-   Copyright (C) 2001-2022 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; see the file COPYING.LIB.  If
-   not, see <https://www.gnu.org/licenses/>.  */
-
-#include <assert.h>
-#include <errno.h>
-#include <libintl.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <ldsodefs.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include "dynamic-link.h"
-
-/* Used at loading time solely for prelink executable.  It is not called
-   concurrently so it is be safe to defined as static.  */
-static struct link_map *resolve_conflict_map __attribute__ ((__unused__));
-
-    /* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code.  */
-#define RESOLVE_MAP(map, scope, ref, version, flags) (*ref = NULL, NULL)
-#define RESOLVE(ref, version, flags) (*ref = NULL, 0)
-#define RESOLVE_CONFLICT_FIND_MAP(map, r_offset) \
-  do {									      \
-    while ((resolve_conflict_map->l_map_end < (ElfW(Addr)) (r_offset))	      \
-	   || (resolve_conflict_map->l_map_start > (ElfW(Addr)) (r_offset)))  \
-      resolve_conflict_map = resolve_conflict_map->l_next;		      \
-									      \
-    (map) = resolve_conflict_map;					      \
-  } while (0)
-
-#include "dynamic-link.h"
-
-void
-_dl_resolve_conflicts (struct link_map *l, ElfW(Rela) *conflict,
-		       ElfW(Rela) *conflictend)
-{
-#if ! ELF_MACHINE_NO_RELA
-  if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_RELOC))
-    _dl_debug_printf ("\nconflict processing: %s\n", DSO_FILENAME (l->l_name));
-
-  {
-    /* Do the conflict relocation of the object and library GOT and other
-       data.  */
-
-    /* Prelinking makes no sense for anything but the main namespace.  */
-    assert (l->l_ns == LM_ID_BASE);
-    resolve_conflict_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
-
-    /* Override these, defined in dynamic-link.h.  */
-#undef CHECK_STATIC_TLS
-#define CHECK_STATIC_TLS(ref_map, sym_map) ((void) 0)
-#undef TRY_STATIC_TLS
-#define TRY_STATIC_TLS(ref_map, sym_map) (0)
-
-    GL(dl_num_cache_relocations) += conflictend - conflict;
-
-    for (; conflict < conflictend; ++conflict)
-      elf_machine_rela (l, NULL, conflict, NULL, NULL,
-			(void *) conflict->r_offset, 0);
-  }
-#endif
-}