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>

2 files changed, 11 insertions, 57 deletions

diff --git a/sysdeps/powerpc/powerpc32/dl-machine.h b/sysdeps/powerpc/powerpc32/dl-machine.h
index 70961b4b78..7583b491f9 100644
--- a/sysdeps/powerpc/powerpc32/dl-machine.h
+++ b/sysdeps/powerpc/powerpc32/dl-machine.h
@@ -294,7 +294,6 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
   const int r_type = ELF32_R_TYPE (reloc->r_info);
   struct link_map *sym_map = NULL;
 
-#ifndef RESOLVE_CONFLICT_FIND_MAP
   if (r_type == R_PPC_RELATIVE)
     {
       *reloc_addr = map->l_addr + reloc->r_addend;
@@ -318,9 +317,6 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
       value = SYMBOL_ADDRESS (sym_map, sym, true);
     }
   value += reloc->r_addend;
-#else
-  value = reloc->r_addend;
-#endif
 
   if (sym != NULL
       && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)
@@ -341,12 +337,11 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
       *reloc_addr = value;
       break;
 
-#ifndef RESOLVE_CONFLICT_FIND_MAP
-# ifdef RTLD_BOOTSTRAP
-#  define NOT_BOOTSTRAP 0
-# else
-#  define NOT_BOOTSTRAP 1
-# endif
+#ifdef RTLD_BOOTSTRAP
+# define NOT_BOOTSTRAP 0
+#else
+# define NOT_BOOTSTRAP 1
+#endif
 
     case R_PPC_DTPMOD32:
       if (map->l_info[DT_PPC(OPT)]
@@ -361,11 +356,11 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
 	    }
 	  else if (sym_map != NULL)
 	    {
-# ifndef SHARED
+#ifndef SHARED
 	      CHECK_STATIC_TLS (map, sym_map);
-# else
+#else
 	      if (TRY_STATIC_TLS (map, sym_map))
-# endif
+#endif
 		{
 		  reloc_addr[0] = 0;
 		  /* Set up for local dynamic.  */
@@ -395,11 +390,11 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
 	  else if (sym_map != NULL)
 	    {
 	      /* This reloc is always preceded by R_PPC_DTPMOD32.  */
-# ifndef SHARED
+#ifndef SHARED
 	      assert (HAVE_STATIC_TLS (map, sym_map));
-# else
+#else
 	      if (HAVE_STATIC_TLS (map, sym_map))
-# endif
+#endif
 		{
 		  *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
 		  break;
@@ -419,12 +414,8 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
 	  *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
 	}
       break;
-#endif
 
     case R_PPC_JMP_SLOT:
-#ifdef RESOLVE_CONFLICT_FIND_MAP
-      RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr);
-#endif
       if (map->l_info[DT_PPC(GOT)] != 0)
 	{
 	  *reloc_addr = value;
diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h
index a505998351..5da5de7a0a 100644
--- a/sysdeps/powerpc/powerpc64/dl-machine.h
+++ b/sysdeps/powerpc/powerpc64/dl-machine.h
@@ -537,36 +537,6 @@ elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map,
   return finaladdr;
 }
 
-static inline void __attribute__ ((always_inline))
-elf_machine_plt_conflict (struct link_map *map, lookup_t sym_map,
-			  const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
-			  const Elf64_Rela *reloc,
-			  Elf64_Addr *reloc_addr, Elf64_Addr finaladdr)
-{
-#if _CALL_ELF != 2
-  Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr;
-  Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr;
-  Elf64_FuncDesc zero_fd = {0, 0, 0};
-
-  if (sym_map == NULL)
-    finaladdr = 0;
-
-  if (finaladdr == 0)
-    rel = &zero_fd;
-
-  plt->fd_func = rel->fd_func;
-  plt->fd_aux = rel->fd_aux;
-  plt->fd_toc = rel->fd_toc;
-  PPC_DCBST (&plt->fd_func);
-  PPC_DCBST (&plt->fd_aux);
-  PPC_DCBST (&plt->fd_toc);
-  PPC_SYNC;
-#else
-  finaladdr += ppc64_local_entry_offset (map, sym_map, refsym, sym);
-  *reloc_addr = finaladdr;
-#endif
-}
-
 /* Return the final value of a plt relocation.  */
 static inline Elf64_Addr
 elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
@@ -639,7 +609,6 @@ resolve_ifunc (Elf64_Addr value,
 	       const struct link_map *map, const struct link_map *sym_map)
 {
 #if _CALL_ELF != 2
-#ifndef RESOLVE_CONFLICT_FIND_MAP
   /* The function we are calling may not yet have its opd entry relocated.  */
   Elf64_FuncDesc opd;
   if (map != sym_map
@@ -658,7 +627,6 @@ resolve_ifunc (Elf64_Addr value,
       asm ("" : "=r" (value) : "0" (&opd), "X" (opd));
     }
 #endif
-#endif
   return ((Elf64_Addr (*) (unsigned long int)) value) (GLRO(dl_hwcap));
 }
 
@@ -722,13 +690,8 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
 	value = resolve_ifunc (value, map, sym_map);
       /* Fall thru */
     case R_PPC64_JMP_SLOT:
-#ifdef RESOLVE_CONFLICT_FIND_MAP
-      elf_machine_plt_conflict (map, sym_map, refsym, sym,
-				reloc, reloc_addr, value);
-#else
       elf_machine_fixup_plt (map, sym_map, refsym, sym,
 			     reloc, reloc_addr, value);
-#endif
       return;
 
     case R_PPC64_DTPMOD64: