Update.

2003-04-22  Roland McGrath  <roland@redhat.com>

	* elf/elf.h (AT_SYSINFO_EHDR): New macro, replaces AT_SYSINFO_EH_FRAME.
	* sysdeps/generic/ldsodefs.h (struct rtld_global): Remove
	dl_sysinfo_eh_frame member, add dl_sysinfo_dso member instead.
	* elf/dl-support.c: Update defn.
	* sysdeps/generic/libc-start.c: Don't call __register_frame_info_bases.
	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start) [NEED_DL_SYSINFO]:
	Set GL(dl_sysinfo_dso) from AT_SYSINFO_EHDR.
	(_dl_show_auxv): Grok AT_SYSINFO_EHDR, not AT_SYSINFO_EH_FRAME.
	* elf/rtld.c (dl_main) [NEED_DL_SYSINFO]: If GL(dl_sysinfo_dso) is
	set, set up a link_map for the preloaded, prelinked object.

1 files changed, 42 insertions, 0 deletions

diff --git a/elf/rtld.c b/elf/rtld.c
index 9d2a94c..e9e781a 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1069,6 +1069,48 @@ of this helper program; chances are you did not intend to run this program.\n\
       assert (i == npreloads);
     }
 
+#ifdef NEED_DL_SYSINFO
+  if (GL(dl_sysinfo_dso) != NULL)
+    {
+      /* We have a prelinked DSO preloaded by the system.  */
+      GL(dl_sysinfo) = GL(dl_sysinfo_dso)->e_entry;
+
+      /* Do an abridged version of the work _dl_map_object_from_fd would do
+	 to map in the object.  It's already mapped and prelinked (and
+	 better be, since it's read-only and so we couldn't relocate it).
+	 We just want our data structures to describe it as if we had just
+	 mapped and relocated it normally.  */
+      struct link_map *l = _dl_new_object ((char *) "", "", lt_library, NULL);
+      if (__builtin_expect (l != NULL, 1))
+	{
+	  l->l_phdr = ((const void *) GL(dl_sysinfo_dso)
+		       + GL(dl_sysinfo_dso)->e_phoff);
+	  l->l_phnum = GL(dl_sysinfo_dso)->e_phnum;
+	  for (uint_fast16_t i = 0; i < l->l_phnum; ++i)
+	    {
+	      const ElfW(Phdr) *const ph = &l->l_phdr[i];
+	      if (ph->p_type == PT_DYNAMIC)
+		{
+		  l->l_ld = (void *) ph->p_vaddr;
+		  l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn));
+		  break;
+		}
+	      if (ph->p_type == PT_LOAD)
+		assert ((void *) ph->p_vaddr == GL(dl_sysinfo_dso));
+	    }
+	  elf_get_dynamic_info (l);
+	  _dl_setup_hash (l);
+	  l->l_relocated = 1;
+
+	  /* Now that we have the info handy, use the DSO image's soname
+	     so this object can be looked up by name.  */
+	  if (l->l_info[DT_SONAME] != NULL)
+	    l->l_libname->name = ((char *) D_PTR (l, l_info[DT_STRTAB])
+				  + l->l_info[DT_SONAME]->d_un.d_val);
+	}
+    }
+#endif
+
   /* Load all the libraries specified by DT_NEEDED entries.  If LD_PRELOAD
      specified some libraries to load, these are inserted before the actual
      dependencies in the executable's searchlist for symbol resolution.  */