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authorRoland McGrath <roland@gnu.org>1996-06-03 04:46:40 +0000
committerRoland McGrath <roland@gnu.org>1996-06-03 04:46:40 +0000
commit710f7bab59b9bb02f1cd46fa2db14e2b4b0a806a (patch)
treece514b2cae73e161177b1a390c7c4118efcff0b0 /elf
parent6c03c2cf27b1a12cbf680377e4796b88a20ed9db (diff)
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Mon Jun 3 00:30:35 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>cvs/libc-960603
* elf/dl-lookup.c (_dl_lookup_symbol): Take new arg RELOC_ADDR and don't allow a defn resolving to that address. * elf/link.h: Update prototype and comment. * elf/dl-runtime.c (fixup): Define local `resolve' function and pass it to elf_machine_relplt. * elf/dl-reloc.c (_dl_relocate_object: resolve): Take new arg RELOC_ADDR and pass it through to _dl_lookup_symbol. * elf/do-rel.h (elf_dynamic_do_rel): Pass RESOLVE to elf_machine_rel instead of calling it ourselves and passing its results. (elf_dynamic_do_rel): RESOLVE fn takes new arg RELOC_ADDR. * elf/rtld.c (dl_main): Pass 0 for RELOC_ADDR to _dl_lookup_symbol. * sysdeps/i386/dl-machine.h (elf_machine_rel): Remove SYM_LOADADDR arg. Add RESOLVE function ptr arg. Call *RESOLVE as necessary. * sysdeps/m68k/dl-machine.h (elf_machine_rela): Likewise. * sysdeps/stub/dl-machine.h: Likewise. * csu/initfini.c (_fini): Add extern decl for i_am_not_a_leaf. * elf/dlfcn.h (dl_open_mode): Enumerated type removed. (RTLD_LAZY, RTLD_NOW): Define these as macros instead. (RTLD_GLOBAL): New macro. (dlopen): Take arg of type int instead of dl_open_mode. * elf/dlopen.c: Likewise. * math/math.h (_Mldbl): New macro, either produces L suffix or not. (M_*): Use it for these constants.
Diffstat (limited to 'elf')
-rw-r--r--elf/dl-lookup.c7
-rw-r--r--elf/dl-reloc.c5
-rw-r--r--elf/dl-runtime.c31
-rw-r--r--elf/dlfcn.h18
-rw-r--r--elf/dlopen.c4
-rw-r--r--elf/do-rel.h25
-rw-r--r--elf/link.h7
-rw-r--r--elf/rtld.c2
8 files changed, 34 insertions, 65 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c
index 90c9b6a..b72a6a2 100644
--- a/elf/dl-lookup.c
+++ b/elf/dl-lookup.c
@@ -23,13 +23,15 @@ Cambridge, MA 02139, USA. */
#include <assert.h>
/* Search loaded objects' symbol tables for a definition of the symbol
- UNDEF_NAME. If NOPLT is nonzero, then a PLT entry cannot satisfy the
- reference; some different binding must be found. */
+ UNDEF_NAME. The chosen value can't be RELOC_ADDR. If NOPLT is nonzero,
+ then a PLT entry cannot satisfy the reference; some different binding
+ must be found. */
Elf32_Addr
_dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
struct link_map *symbol_scope,
const char *reference_name,
+ Elf32_Addr reloc_addr,
int noplt)
{
unsigned long int hash = elf_hash (undef_name);
@@ -59,6 +61,7 @@ _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
const Elf32_Sym *sym = &symtab[symidx];
if (sym->st_value == 0 || /* No value. */
+ reloc_addr == map->l_addr + sym->st_value || /* Self ref. */
(noplt && sym->st_shndx == SHN_UNDEF)) /* Unwanted PLT entry. */
continue;
diff --git a/elf/dl-reloc.c b/elf/dl-reloc.c
index 46fc4c4..424d303 100644
--- a/elf/dl-reloc.c
+++ b/elf/dl-reloc.c
@@ -60,10 +60,11 @@ _dl_relocate_object (struct link_map *l, int lazy)
= ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
- Elf32_Addr resolve (const Elf32_Sym **ref, int noplt)
+ Elf32_Addr resolve (const Elf32_Sym **ref,
+ Elf32_Addr reloc_addr, int noplt)
{
return _dl_lookup_symbol (strtab + (*ref)->st_name, ref, scope,
- l->l_name, noplt);
+ l->l_name, reloc_addr, noplt);
}
real_next = l->l_next;
diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
index 941a306..0beba76 100644
--- a/elf/dl-runtime.c
+++ b/elf/dl-runtime.c
@@ -67,34 +67,15 @@ fixup (
= (const void *) (l->l_addr + l->l_info[DT_JMPREL]->d_un.d_ptr +
reloc_offset);
- const Elf32_Sym *definer;
- Elf32_Addr loadbase;
- struct link_map *scope, *real_next;
-
- /* Look up the symbol's run-time value. */
-
- real_next = l->l_next;
- if (l->l_info[DT_SYMBOLIC])
+ Elf32_Addr resolve (const Elf32_Sym **ref,
+ Elf32_Addr reloc_addr, int noplt)
{
- l->l_next = _dl_loaded;
- if (l->l_prev)
- l->l_prev->l_next = real_next;
- scope = l;
+ return _dl_lookup_symbol (strtab + (*ref)->st_name, ref, _dl_loaded,
+ l->l_name, reloc_addr, noplt);
}
- else
- scope = _dl_loaded;
-
- definer = &symtab[ELF32_R_SYM (reloc->r_info)];
- loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,
- scope, l->l_name, 1);
-
- /* Restore list frobnication done above for DT_SYMBOLIC. */
- l->l_next = real_next;
- if (l->l_prev)
- l->l_prev->l_next = l;
- /* Apply the relocation with that value. */
- elf_machine_relplt (l, reloc, loadbase, definer);
+ /* Perform the specified relocation. */
+ elf_machine_relplt (l, reloc, &symtab[ELF32_R_SYM (reloc->r_info)], resolve);
return *(Elf32_Addr *) (l->l_addr + reloc->r_offset);
}
diff --git a/elf/dlfcn.h b/elf/dlfcn.h
index e5d68f8..a405baa 100644
--- a/elf/dlfcn.h
+++ b/elf/dlfcn.h
@@ -1,5 +1,5 @@
/* dlfcn.h -- User functions for run-time dynamic loading.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 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
@@ -21,16 +21,18 @@ Cambridge, MA 02139, USA. */
#define _DLFCN_H 1
-/* Type of the second argument to `dlopen'. */
-typedef enum
- {
- RTLD_LAZY = 1, /* Lazy function call binding. */
- RTLD_NOW = 2 /* Immediate function call binding. */
- } dl_open_mode;
+/* The MODE argument to `dlopen' contains one of the following: */
+#define RTLD_LAZY 0x001 /* Lazy function call binding. */
+#define RTLD_NOW 0x002 /* Immediate function call binding. */
+
+/* If the following bit is set in the MODE argument to `dlopen',
+ the symbols of the loaded object and its dependencies are made
+ visible as if the object were linked directly into the program. */
+#define RTLD_GLOBAL 0x100
/* Open the shared object FILE and map it in; return a handle that can be
passed to `dlsym' to get symbol values from it. */
-extern void *dlopen (const char *__file, dl_open_mode);
+extern void *dlopen (const char *__file, int __mode);
/* Unmap and close a shared object opened by `dlopen'.
The handle cannot be used again after calling `dlclose'. */
diff --git a/elf/dlopen.c b/elf/dlopen.c
index de65a20..26ed35a 100644
--- a/elf/dlopen.c
+++ b/elf/dlopen.c
@@ -1,5 +1,5 @@
/* dlopen -- Load a shared object at run time.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 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
@@ -22,7 +22,7 @@ Cambridge, MA 02139, USA. */
#include <dlfcn.h>
void *
-dlopen (const char *file, dl_open_mode mode)
+dlopen (const char *file, int mode)
{
struct link_map *new, *l;
diff --git a/elf/do-rel.h b/elf/do-rel.h
index a265550..438613a 100644
--- a/elf/do-rel.h
+++ b/elf/do-rel.h
@@ -38,7 +38,7 @@ static inline void
elf_dynamic_do_rel (struct link_map *map,
int reltag, int sztag,
Elf32_Addr (*resolve) (const Elf32_Sym **symbol,
- int noplt),
+ Elf32_Addr reloc_addr, int noplt),
int lazy)
{
const Elf32_Sym *const symtab
@@ -53,28 +53,7 @@ elf_dynamic_do_rel (struct link_map *map,
elf_machine_lazy_rel (map, r);
else
for (; r < end; ++r)
- {
- const Elf32_Sym *definer = &symtab[ELF32_R_SYM (r->r_info)];
- Elf32_Addr loadbase;
-
- if (ELF32_R_SYM (r->r_info) == STN_UNDEF)
- loadbase = 0; /* This value will not be consulted. */
- else if (ELF32_ST_BIND (definer->st_info) == STB_LOCAL)
- /* Local symbols always refer to the containing object. */
- loadbase = map->l_addr;
- else
- {
- if (resolve)
- loadbase = (*resolve)
- (&definer, elf_machine_pltrel_p (ELF32_R_TYPE (r->r_info)));
- else
- {
- assert (definer->st_shndx != SHN_UNDEF);
- loadbase = map->l_addr;
- }
- }
- elf_machine_rel (map, r, loadbase, definer);
- }
+ elf_machine_rel (map, r, &symtab[ELF32_R_SYM (r->r_info)], resolve);
}
#undef elf_dynamic_do_rel
diff --git a/elf/link.h b/elf/link.h
index cd75263..a19a2ce 100644
--- a/elf/link.h
+++ b/elf/link.h
@@ -185,12 +185,15 @@ extern void _dl_setup_hash (struct link_map *map);
reference; it is replaced with the defining symbol, and the base load
address of the defining object is returned. SYMBOL_SCOPE is the head of
the chain used for searching. REFERENCE_NAME should name the object
- containing the reference; it is used in error messages. If NOPLT is
- nonzero, then the reference must not be resolved to a PLT entry. */
+ containing the reference; it is used in error messages. RELOC_ADDR is
+ the address being fixed up and the chosen symbol cannot be one with this
+ value. If NOPLT is nonzero, then the reference must not be resolved to
+ a PLT entry. */
extern Elf32_Addr _dl_lookup_symbol (const char *undef,
const Elf32_Sym **sym,
struct link_map *symbol_scope,
const char *reference_name,
+ Elf32_Addr reloc_addr,
int noplt);
diff --git a/elf/rtld.c b/elf/rtld.c
index 157cde5..511d19c 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -318,7 +318,7 @@ of this helper program; chances are you did not intend to run this program.\n",
const Elf32_Sym *ref = NULL;
Elf32_Addr loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,
_dl_loaded, "argument",
- 0);
+ 0, 0);
char buf[20], *bp;
buf[sizeof buf - 1] = '\0';
bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);