Copy relocations against protected symbols

Copy relocs are used in a scheme to avoid dynamic text relocations in
non-PIC executables that refer to variables defined in shared
libraries.  The idea is to have the linker define any such variable in
the executable, with a copy reloc copying the initial value, then have
both the executable and shared library refer to the executable copy.
If the shared library defines the variable as protected then we have
two copies of the variable being used.

	PR 15228
	* elflink.c (_bfd_elf_adjust_dynamic_copy): Add "info" param.
	Error on copy relocs against protected symbols.
	(elf_merge_st_other): Set h->protected_def.
	* elf-bfd.h (struct elf_link_hash_entry): Add "protected_def".
	(_bfd_elf_adjust_dynamic_copy): Update prototype.
	* elf-m10300.c (_bfd_mn10300_elf_adjust_dynamic_symbol): Update
	_bfd_elf_adjust_dynamic_copy call.
	* elf32-arm.c (elf32_arm_adjust_dynamic_symbol): Likewise.
	* elf32-cr16.c (_bfd_cr16_elf_adjust_dynamic_symbol): Likewise.
	* elf32-cris.c (elf_cris_adjust_dynamic_symbol): Likewise.
	* elf32-hppa.c (elf32_hppa_adjust_dynamic_symbol): Likewise.
	* elf32-i370.c (i370_elf_adjust_dynamic_symbol): Likewise.
	* elf32-i386.c (elf_i386_adjust_dynamic_symbol): Likewise.
	* elf32-lm32.c (lm32_elf_adjust_dynamic_symbol): Likewise.
	* elf32-m32r.c (m32r_elf_adjust_dynamic_symbol): Likewise.
	* elf32-m68k.c (elf_m68k_adjust_dynamic_symbol): Likewise.
	* elf32-metag.c (elf_metag_adjust_dynamic_symbol): Likewise.
	* elf32-or1k.c (or1k_elf_adjust_dynamic_symbol): Likewise.
	* elf32-ppc.c (ppc_elf_adjust_dynamic_symbol): Likewise.
	* elf32-s390.c (elf_s390_adjust_dynamic_symbol): Likewise.
	* elf32-sh.c (sh_elf_adjust_dynamic_symbol): Likewise.
	* elf32-tic6x.c (elf32_tic6x_adjust_dynamic_symbol): Likewise.
	* elf32-tilepro.c (tilepro_elf_adjust_dynamic_symbol): Likewise.
	* elf32-vax.c (elf_vax_adjust_dynamic_symbol): Likewise.
	* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Likewise.
	* elf64-s390.c (elf_s390_adjust_dynamic_symbol): Likewise.
	* elf64-sh64.c (sh64_elf64_adjust_dynamic_symbol): Likewise.
	* elf64-x86-64.c (elf_x86_64_adjust_dynamic_symbol): Likewise.
	* elfnn-aarch64.c (elfNN_aarch64_adjust_dynamic_symbol): Likewise.
	* elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol): Likewise.
	* elfxx-sparc.c (_bfd_sparc_elf_adjust_dynamic_symbol): Likewise.
	* elfxx-tilegx.c (tilegx_elf_adjust_dynamic_symbol): Likewise.

29 files changed, 77 insertions, 28 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 9443507..0db2820 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,39 @@
+2014-12-12  Alan Modra  <amodra@gmail.com>
+
+	PR 15228
+	* elflink.c (_bfd_elf_adjust_dynamic_copy): Add "info" param.
+	Error on copy relocs against protected symbols.
+	(elf_merge_st_other): Set h->protected_def.
+	* elf-bfd.h (struct elf_link_hash_entry): Add "protected_def".
+	(_bfd_elf_adjust_dynamic_copy): Update prototype.
+	* elf-m10300.c (_bfd_mn10300_elf_adjust_dynamic_symbol): Update
+	_bfd_elf_adjust_dynamic_copy call.
+	* elf32-arm.c (elf32_arm_adjust_dynamic_symbol): Likewise.
+	* elf32-cr16.c (_bfd_cr16_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-cris.c (elf_cris_adjust_dynamic_symbol): Likewise.
+	* elf32-hppa.c (elf32_hppa_adjust_dynamic_symbol): Likewise.
+	* elf32-i370.c (i370_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-i386.c (elf_i386_adjust_dynamic_symbol): Likewise.
+	* elf32-lm32.c (lm32_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-m32r.c (m32r_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-m68k.c (elf_m68k_adjust_dynamic_symbol): Likewise.
+	* elf32-metag.c (elf_metag_adjust_dynamic_symbol): Likewise.
+	* elf32-or1k.c (or1k_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-ppc.c (ppc_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-s390.c (elf_s390_adjust_dynamic_symbol): Likewise.
+	* elf32-sh.c (sh_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-tic6x.c (elf32_tic6x_adjust_dynamic_symbol): Likewise.
+	* elf32-tilepro.c (tilepro_elf_adjust_dynamic_symbol): Likewise.
+	* elf32-vax.c (elf_vax_adjust_dynamic_symbol): Likewise.
+	* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Likewise.
+	* elf64-s390.c (elf_s390_adjust_dynamic_symbol): Likewise.
+	* elf64-sh64.c (sh64_elf64_adjust_dynamic_symbol): Likewise.
+	* elf64-x86-64.c (elf_x86_64_adjust_dynamic_symbol): Likewise.
+	* elfnn-aarch64.c (elfNN_aarch64_adjust_dynamic_symbol): Likewise.
+	* elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol): Likewise.
+	* elfxx-sparc.c (_bfd_sparc_elf_adjust_dynamic_symbol): Likewise.
+	* elfxx-tilegx.c (tilegx_elf_adjust_dynamic_symbol): Likewise.
+
 2014-12-11  Keith Seitz  <keiths@redhat.com>
 
 	* elf.c (elf_parse_notes): Define convenience macro
diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index 6ce70bc..5e53cba 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -196,6 +196,8 @@ struct elf_link_hash_entry
   unsigned int pointer_equality_needed : 1;
   /* Symbol is a unique global symbol.  */
   unsigned int unique_global : 1;
+  /* Symbol is defined with non-default visibility.  */
+  unsigned int protected_def : 1;
 
   /* String table index in .dynstr if this is a dynamic symbol.  */
   unsigned long dynstr_index;
@@ -2026,7 +2028,7 @@ extern bfd_boolean _bfd_elf_link_output_relocs
    struct elf_link_hash_entry **);
 
 extern bfd_boolean _bfd_elf_adjust_dynamic_copy
-  (struct elf_link_hash_entry *, asection *);
+  (struct bfd_link_info *, struct elf_link_hash_entry *, asection *);
 
 extern bfd_boolean _bfd_elf_dynamic_symbol_p
   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
diff --git a/bfd/elf-m10300.c b/bfd/elf-m10300.c
index f29025d..1dbb2f9 100644
--- a/bfd/elf-m10300.c
+++ b/bfd/elf-m10300.c
@@ -5024,7 +5024,7 @@ _bfd_mn10300_elf_adjust_dynamic_symbol (struct bfd_link_info * info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Set the sizes of the dynamic sections.  */
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 1ff562c..5b2f66f 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -13339,7 +13339,7 @@ elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-cr16.c b/bfd/elf32-cr16.c
index f16f1c6..6dadcc1 100644
--- a/bfd/elf32-cr16.c
+++ b/bfd/elf32-cr16.c
@@ -2437,7 +2437,7 @@ _bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Set the sizes of the dynamic sections.  */
diff --git a/bfd/elf32-cris.c b/bfd/elf32-cris.c
index 9b2b956..c516b2f 100644
--- a/bfd/elf32-cris.c
+++ b/bfd/elf32-cris.c
@@ -3054,7 +3054,7 @@ elf_cris_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Adjust our "subclass" elements for an indirect symbol.  */
diff --git a/bfd/elf32-hppa.c b/bfd/elf32-hppa.c
index 0588ebb..abc7124 100644
--- a/bfd/elf32-hppa.c
+++ b/bfd/elf32-hppa.c
@@ -1915,7 +1915,7 @@ elf32_hppa_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   sec = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (eh, sec);
+  return _bfd_elf_adjust_dynamic_copy (info, eh, sec);
 }
 
 /* Allocate space in the .plt for entries that won't have relocations.
diff --git a/bfd/elf32-i370.c b/bfd/elf32-i370.c
index c9ed6e0..e28c257 100644
--- a/bfd/elf32-i370.c
+++ b/bfd/elf32-i370.c
@@ -534,7 +534,7 @@ i370_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Increment the index of a dynamic symbol by a given amount.  Called
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c
index 2bd7f43..e0eef28 100644
--- a/bfd/elf32-i386.c
+++ b/bfd/elf32-i386.c
@@ -2229,7 +2229,7 @@ elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-lm32.c b/bfd/elf32-lm32.c
index e694055..5f2b6b8 100644
--- a/bfd/elf32-lm32.c
+++ b/bfd/elf32-lm32.c
@@ -1892,7 +1892,7 @@ lm32_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-m32r.c b/bfd/elf32-m32r.c
index 8dba9f0..e6b45ab 100644
--- a/bfd/elf32-m32r.c
+++ b/bfd/elf32-m32r.c
@@ -1919,7 +1919,7 @@ m32r_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-m68k.c b/bfd/elf32-m68k.c
index 0058da4..9a42288 100644
--- a/bfd/elf32-m68k.c
+++ b/bfd/elf32-m68k.c
@@ -3237,7 +3237,7 @@ elf_m68k_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Set the sizes of the dynamic sections.  */
diff --git a/bfd/elf32-metag.c b/bfd/elf32-metag.c
index 47ca5de..a68b51c 100644
--- a/bfd/elf32-metag.c
+++ b/bfd/elf32-metag.c
@@ -2587,7 +2587,7 @@ elf_metag_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (eh, s);
+  return _bfd_elf_adjust_dynamic_copy (info, eh, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-or1k.c b/bfd/elf32-or1k.c
index 5cf29e1..e5b7bad 100644
--- a/bfd/elf32-or1k.c
+++ b/bfd/elf32-or1k.c
@@ -2187,7 +2187,7 @@ or1k_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index b4d2075..8429e8f 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -5628,7 +5628,7 @@ ppc_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Generate a symbol to mark plt call stubs.  For non-PIC code the sym is
diff --git a/bfd/elf32-s390.c b/bfd/elf32-s390.c
index ebcb028..07e594f 100644
--- a/bfd/elf32-s390.c
+++ b/bfd/elf32-s390.c
@@ -1762,7 +1762,7 @@ elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-sh.c b/bfd/elf32-sh.c
index 44a3aa7..a737044 100644
--- a/bfd/elf32-sh.c
+++ b/bfd/elf32-sh.c
@@ -2919,7 +2919,7 @@ sh_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-tic6x.c b/bfd/elf32-tic6x.c
index 8381cfa..9f17979 100644
--- a/bfd/elf32-tic6x.c
+++ b/bfd/elf32-tic6x.c
@@ -2168,7 +2168,7 @@ elf32_tic6x_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 static bfd_boolean
diff --git a/bfd/elf32-tilepro.c b/bfd/elf32-tilepro.c
index b9a31d5..0959924 100644
--- a/bfd/elf32-tilepro.c
+++ b/bfd/elf32-tilepro.c
@@ -2189,7 +2189,7 @@ tilepro_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, htab->sdynbss);
+  return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdynbss);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf32-vax.c b/bfd/elf32-vax.c
index 1f41867..05e65e9 100644
--- a/bfd/elf32-vax.c
+++ b/bfd/elf32-vax.c
@@ -1043,7 +1043,7 @@ elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* This function is called via elf_link_hash_traverse.  It resets GOT
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index cb58df1..26ae9ed 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -7121,7 +7121,7 @@ ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->dynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* If given a function descriptor symbol, hide both the function code
diff --git a/bfd/elf64-s390.c b/bfd/elf64-s390.c
index b2f1aa5..9a874f2 100644
--- a/bfd/elf64-s390.c
+++ b/bfd/elf64-s390.c
@@ -1707,7 +1707,7 @@ elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elf64-sh64.c b/bfd/elf64-sh64.c
index 311d7c3..7497929 100644
--- a/bfd/elf64-sh64.c
+++ b/bfd/elf64-sh64.c
@@ -3381,7 +3381,7 @@ sh64_elf64_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* This function is called via sh_elf_link_hash_traverse if we are
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index 64b4634..40a2a87 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -2445,7 +2445,7 @@ elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elflink.c b/bfd/elflink.c
index b023ec5..a01daf2 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -873,6 +873,8 @@ elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
       if (symvis - 1 < hvis - 1)
 	h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
     }
+  else if (definition && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT)
+    h->protected_def = 1;
 }
 
 /* This function is called when we want to merge a new symbol with an
@@ -2637,7 +2639,8 @@ _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
    DYNBSS.  */
 
 bfd_boolean
-_bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
+_bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
+			      struct elf_link_hash_entry *h,
 			      asection *dynbss)
 {
   unsigned int power_of_two;
@@ -2676,6 +2679,14 @@ _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
   /* Increment the size of DYNBSS to make room for the symbol.  */
   dynbss->size += h->size;
 
+  if (h->protected_def)
+    {
+      info->callbacks->einfo
+	(_("%P: copy reloc against protected `%T' is invalid\n"),
+	 h->root.root.string);
+      return FALSE;
+    }
+
   return TRUE;
 }
 
diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index 0879db9..4f0e0c6 100644
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -5542,7 +5542,7 @@ elfNN_aarch64_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 
 }
 
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index 8112849..db403b3 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -9215,7 +9215,7 @@ _bfd_mips_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
      dynamic will now refer to the local copy instead.  */
   hmips->possibly_dynamic_relocs = 0;
 
-  return _bfd_elf_adjust_dynamic_copy (h, htab->sdynbss);
+  return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdynbss);
 }
 
 /* This function is called after all the input files have been read,
diff --git a/bfd/elfxx-sparc.c b/bfd/elfxx-sparc.c
index d5f92d4..a56493f 100644
--- a/bfd/elfxx-sparc.c
+++ b/bfd/elfxx-sparc.c
@@ -2211,7 +2211,7 @@ _bfd_sparc_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
 
   s = htab->sdynbss;
 
-  return _bfd_elf_adjust_dynamic_copy (h, s);
+  return _bfd_elf_adjust_dynamic_copy (info, h, s);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for
diff --git a/bfd/elfxx-tilegx.c b/bfd/elfxx-tilegx.c
index e206bc7..90f4395 100644
--- a/bfd/elfxx-tilegx.c
+++ b/bfd/elfxx-tilegx.c
@@ -2456,7 +2456,7 @@ tilegx_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       h->needs_copy = 1;
     }
 
-  return _bfd_elf_adjust_dynamic_copy (h, htab->sdynbss);
+  return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdynbss);
 }
 
 /* Allocate space in .plt, .got and associated reloc sections for