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-rw-r--r--sysdeps/generic/dl-lookupcfg.h22
-rw-r--r--sysdeps/generic/dl-machine.h7
-rw-r--r--sysdeps/generic/ldsodefs.h66
3 files changed, 70 insertions, 25 deletions
diff --git a/sysdeps/generic/dl-lookupcfg.h b/sysdeps/generic/dl-lookupcfg.h
new file mode 100644
index 0000000000..8ce19b8741
--- /dev/null
+++ b/sysdeps/generic/dl-lookupcfg.h
@@ -0,0 +1,22 @@
+/* Configuration of lookup functions.
+ Copyright (C) 2000 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* Some platforms need more information from the symbol lookup function
+ than just the address. But this is not generally the case. */
+#undef DL_LOOKUP_RETURNS_MAP
diff --git a/sysdeps/generic/dl-machine.h b/sysdeps/generic/dl-machine.h
index d74aebeb6d..a23f178034 100644
--- a/sysdeps/generic/dl-machine.h
+++ b/sysdeps/generic/dl-machine.h
@@ -52,11 +52,12 @@ elf_machine_load_address (void)
/* Fixup a PLT entry to bounce directly to the function at VALUE. */
-static inline void
-elf_machine_fixup_plt (struct link_map *map, const Elf32_Rel *reloc,
+static inline Elf32_Addr
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+ const Elf32_Rel *reloc,
Elf32_Addr *reloc_addr, Elf32_Addr value)
{
- *reloc_addr = value;
+ return *reloc_addr = value;
}
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index ff58115f1c..4fc1578a95 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -30,6 +30,7 @@
#include <elf.h>
#include <dlfcn.h>
#include <link.h>
+#include <dl-lookupcfg.h>
__BEGIN_DECLS
@@ -49,6 +50,27 @@ __BEGIN_DECLS
# define D_PTR(map,i) map->i->d_un.d_ptr
#endif
+/* On some platforms more information than just the address of the symbol
+ is needed from the lookup functions. In this case we return the whole
+ link map. */
+#ifdef DL_LOOKUP_RETURNS_MAP
+typedef struct link_map *lookup_t;
+# define LOOKUP_VALUE(map) map
+# define LOOKUP_VALUE_ADDRESS(map) (map ? map->l_addr : 0)
+#else
+typedef ElfW(Addr) lookup_t;
+# define LOOKUP_VALUE(map) map->l_addr
+# define LOOKUP_VALUE_ADDRESS(address) address
+#endif
+
+/* on some architectures a pointer to a function is not just a pointer
+ to the actual code of the function but rather an architecture
+ specific descriptor. */
+#ifndef ELF_FUNCTION_PTR_IS_SPECIAL
+#define DL_SYMBOL_ADDRESS(map, ref) \
+ (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
+#endif
+
/* For the version handling we need an array with only names and their
hash values. */
struct r_found_version
@@ -271,38 +293,38 @@ extern void _dl_setup_hash (struct link_map *map) internal_function;
RELOC_TYPE is a machine-dependent reloc type, which is passed to
the `elf_machine_lookup_*_p' macros in dl-machine.h to affect which
symbols can be chosen. */
-extern ElfW(Addr) _dl_lookup_symbol (const char *undef,
- struct link_map *undef_map,
- const ElfW(Sym) **sym,
- struct r_scope_elem *symbol_scope[],
- int reloc_type)
+extern lookup_t _dl_lookup_symbol (const char *undef,
+ struct link_map *undef_map,
+ const ElfW(Sym) **sym,
+ struct r_scope_elem *symbol_scope[],
+ int reloc_type)
internal_function;
/* Lookup versioned symbol. */
-extern ElfW(Addr) _dl_lookup_versioned_symbol (const char *undef,
- struct link_map *undef_map,
- const ElfW(Sym) **sym,
- struct r_scope_elem *symbol_scope[],
- const struct r_found_version *version,
- int reloc_type)
+extern lookup_t _dl_lookup_versioned_symbol (const char *undef,
+ struct link_map *undef_map,
+ const ElfW(Sym) **sym,
+ struct r_scope_elem *symbol_scope[],
+ const struct r_found_version *version,
+ int reloc_type)
internal_function;
/* For handling RTLD_NEXT we must be able to skip shared objects. */
-extern ElfW(Addr) _dl_lookup_symbol_skip (const char *undef,
- struct link_map *undef_map,
- const ElfW(Sym) **sym,
- struct r_scope_elem *symbol_scope[],
- struct link_map *skip_this)
+extern lookup_t _dl_lookup_symbol_skip (const char *undef,
+ struct link_map *undef_map,
+ const ElfW(Sym) **sym,
+ struct r_scope_elem *symbol_scope[],
+ struct link_map *skip_this)
internal_function;
/* For handling RTLD_NEXT with versioned symbols we must be able to
skip shared objects. */
-extern ElfW(Addr) _dl_lookup_versioned_symbol_skip (const char *undef,
- struct link_map *undef_map,
- const ElfW(Sym) **sym,
- struct r_scope_elem *symbol_scope[],
- const struct r_found_version *version,
- struct link_map *skip_this)
+extern lookup_t _dl_lookup_versioned_symbol_skip (const char *undef,
+ struct link_map *undef_map,
+ const ElfW(Sym) **sym,
+ struct r_scope_elem *symbol_scope[],
+ const struct r_found_version *version,
+ struct link_map *skip_this)
internal_function;
/* Look up symbol NAME in MAP's scope and return its run-time address. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-12 00:56:50 +0000