* elf/dl-load.c (_dl_map_object): Add MAP_INHERIT flag in mmap

from zero fill.

	* elf/dl-lookup.c (_dl_lookup_symbol): Take new flag arg NOSELF;
 	if nonzero, don't let *REF satisfy the reference itself.
	* elf/link.h (_dl_lookup_symbol): Add new arg NOSELF in decl.
	* sysdeps/i386/dl-runtime.c (_dl_runtime_resolve): Pass new arg to
 	_dl_lookup_symbol.
	* elf/do-rel.h (elf_dynamic_do_rel): Pass new second arg of
 	R->r_offset to RESOLVE callback.
	* elf/dl-reloc.c (_dl_relocate_object: resolve): Don't let *REF
 	satisfy the reference itself if its value equals the reloc's
 	offset.

	* elf/rtld.c (dl_main): Write a newline in fatal msg.

	* Makerules (lib%.so: lib%_pic.a): Pass $(LDFLAGS.so).

ChangeLog

@@ -1,5 +1,23 @@
 Thu Jun  8 02:50:26 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
 
+	* elf/dl-load.c (_dl_map_object): Add MAP_INHERIT flag in mmap
+ 	from zero fill.
+
+	* elf/dl-lookup.c (_dl_lookup_symbol): Take new flag arg NOSELF;
+ 	if nonzero, don't let *REF satisfy the reference itself.
+	* elf/link.h (_dl_lookup_symbol): Add new arg NOSELF in decl.
+	* sysdeps/i386/dl-runtime.c (_dl_runtime_resolve): Pass new arg to
+ 	_dl_lookup_symbol.
+	* elf/do-rel.h (elf_dynamic_do_rel): Pass new second arg of
+ 	R->r_offset to RESOLVE callback.
+	* elf/dl-reloc.c (_dl_relocate_object: resolve): Don't let *REF
+ 	satisfy the reference itself if its value equals the reloc's
+ 	offset.
+
+	* elf/rtld.c (dl_main): Write a newline in fatal msg.
+
+	* Makerules (lib%.so: lib%_pic.a): Pass $(LDFLAGS.so).
+
 	* elf/rtld.c [! NDEBUG] (__assert_perror_fail): New function.
 
 	* hurd/hurdstartup.c (_hurd_startup): Fancier kludge to guess phdr

Makerules

@@ -355,10 +355,10 @@ ifeq (yes,$(build-shared))
 # $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
 # on other shared objects.
 lib%.so: lib%_pic.a
-	$(LINK.o) -shared -o $@ -Wl,--whole-archive $< \
-		  $(LDFLAGS-$(notdir $*).so) \
+	$(LINK.o) -shared -o $@ \
+		  $(LDFLAGS.so) $(LDFLAGS-$(notdir $*).so) \
 		  -L$(firstword $(objdir) .)  -L$(common-objpfx:%/=%) \
-		  $(LDLIBS-$(notdir $*).so)
+		  $(LDLIBS-$(notdir $*).so) -Wl,--whole-archive $< \
 
 # Don't try to use -lc when making libc.so itself.
 # Also omits crti.o and crtn.o, which we do not want

elf/dl-load.c

@@ -354,8 +354,8 @@ _dl_map_object (struct link_map *loader, const char *name,
 
 		if (zeroend > zeropage)
 		  /* Map the remaining zero pages in from the zero fill FD.  */
-		  mapat = mmap (zeropage, zeroend - zeropage,
-				prot, MAP_ANON|MAP_PRIVATE|MAP_FIXED,
+		  mapat = mmap (zeropage, zeroend - zeropage, prot,
+				MAP_ANON|MAP_PRIVATE|MAP_FIXED|MAP_INHERIT,
 				_dl_zerofd, 0);
 	      }
 	  }

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.  Don't use a PLT defn in UNDEF_MAP, since
-   that is the object making the reference.  */
+   the symbol UNDEF_NAME.  If NOSELF is nonzero, then *REF
+   cannot satisfy the reference itself; 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)
+		   const char *reference_name,
+		   int noself)
 {
   unsigned long int hash = elf_hash (undef_name);
   struct link_map *map;
@@ -57,7 +59,9 @@ _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
 	{
 	  const Elf32_Sym *sym = &symtab[symidx];
 
-	  if (sym->st_value == 0)
+	  if (sym->st_value == 0 || /* No value.  */
+	      sym->st_shndx == SHN_UNDEF || /* PLT entry.  */
+	      (noself && sym == *ref))	/* The reference can't define it.  */
 	    continue;
 
 	  switch (ELF32_ST_TYPE (sym->st_info))
@@ -71,12 +75,6 @@ _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
 	      continue;
 	    }
 
-	  if (sym->st_shndx == SHN_UNDEF)
-	    /* This is the same symbol we are looking for the value for.
-	       If it is a PLT entry, it will have a value of its own;
-	       but that is not what we are looking for.  */
-	      continue;
-
 	  if (sym != *ref && strcmp (strtab + sym->st_name, undef_name))
 	    /* Not the symbol we are looking for.  */
 	    continue;

elf/dl-reloc.c

@@ -60,10 +60,10 @@ _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)
+    Elf32_Addr resolve (const Elf32_Sym **ref, Elf32_Addr r_offset)
       {
 	return _dl_lookup_symbol (strtab + (*ref)->st_name, ref, scope,
-				  l->l_name);
+				  l->l_name, (*ref)->st_value == r_offset);
       }
 
     real_next = l->l_next;

elf/do-rel.h

@@ -37,7 +37,8 @@ Cambridge, MA 02139, USA.  */
 static inline void
 elf_dynamic_do_rel (struct link_map *map,
 		    int reltag, int sztag, 
-		    Elf32_Addr (*resolve) (const Elf32_Sym **),
+		    Elf32_Addr (*resolve) (const Elf32_Sym **symbol,
+					   Elf32_Addr r_offset),
 		    int lazy)
 {
   const Elf32_Sym *const symtab
@@ -61,7 +62,7 @@ elf_dynamic_do_rel (struct link_map *map,
 	else
 	  {
 	    if (resolve)
-	      loadbase = (*resolve) (&definer);
+	      loadbase = (*resolve) (&definer, r->r_offset);
 	    else
 	      {
 		assert (definer->st_shndx != SHN_UNDEF);

elf/link.h

@@ -173,11 +173,14 @@ 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.  */
+   containing the reference; it is used in error messages.  If NOSELF is
+   nonzero, them *SYM itself cannot define the value; another binding must
+   be found.  */
 extern Elf32_Addr _dl_lookup_symbol (const char *undef,
 				     const Elf32_Sym **sym,
 				     struct link_map *symbol_scope,
-				     const char *reference_name);
+				     const char *reference_name,
+				     int noself);
 
 
 /* List of objects currently loaded.  */

elf/rtld.c

@@ -258,8 +258,8 @@ of this helper program; chances are you did not intend to run this program.\n",
     _dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
 		      ": error in loading shared libraries\n",
 		      errobj ?: "", errobj ? ": " : "",
-		      errstring, err ? ": " : NULL,
-		      err ? strerror (err) : NULL, NULL);
+		      errstring, err ? ": " : "",
+		      err ? strerror (err) : "", "\n", NULL);
 
   /* Once we return, _dl_sysdep_start will invoke
      the DT_INIT functions and then *USER_ENTRY.  */

sysdeps/i386/dl-runtime.c

@@ -64,7 +64,7 @@ _dl_runtime_resolve (Elf32_Word reloc_offset)
   
   definer = &symtab[ELF32_R_SYM (reloc->r_info)];
   loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,
-				scope, l->l_name);
+				scope, l->l_name, 0);
   
   /* Restore list frobnication done above for DT_SYMBOLIC.  */
   l->l_next = real_next;