From d930affa2d475d1cc6792f1e6d56bef3d6c617db Mon Sep 17 00:00:00 2001
From: Cupertino Miranda <cmiranda@synopsys.com>
Date: Fri, 2 Mar 2018 17:16:21 +0100
Subject: [PATCH] Refactored location where GOT information is collected.

Change location where GOT information is collected for ARC target, avoiding
posible use conflicts of the previous .got field in the symbols hash_entry.

bfd/
2018-03-01  Cupertino Miranda  <cmiranda@synopsys.com>

	* arc-got.h (get_got_entry_list_for_symbol): Changed.
	* ef32-arc.c (struct elf_arc_link_hash_entry): Moved and changed.
	(elf_arc_link_hash_newfunc): Changed.
	(arc_elf_link_hash_table_create): Removed old initializations.
	(elf_arc_relocate_section, elf_arc_finish_dynamic_symbol): Changed.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
[Romain: rebase on top of 2.31]
Signed-off-by: Romain Naour <romain.naour@gmail.com>
---
 bfd/arc-got.h   |  6 +++--
 bfd/elf32-arc.c | 77 +++++++++++++++++++++++++++++++--------------------------
 2 files changed, 46 insertions(+), 37 deletions(-)

diff --git a/bfd/arc-got.h b/bfd/arc-got.h
index a86061bcb38..81ce88fe21a 100644
--- a/bfd/arc-got.h
+++ b/bfd/arc-got.h
@@ -156,9 +156,11 @@ get_got_entry_list_for_symbol (bfd *abfd,
 			       unsigned long r_symndx,
 			       struct elf_link_hash_entry *h)
 {
-  if (h != NULL)
+  struct elf_arc_link_hash_entry *h1 =
+    ((struct elf_arc_link_hash_entry *) h);
+  if (h1 != NULL)
     {
-      return &h->got.glist;
+      return &h1->got_ents;
     }
   else
     {
diff --git a/bfd/elf32-arc.c b/bfd/elf32-arc.c
index a48ef0ca15f..ab84de43815 100644
--- a/bfd/elf32-arc.c
+++ b/bfd/elf32-arc.c
@@ -160,6 +160,18 @@ struct arc_relocation_data
   const char *    symbol_name;
 };
 
+/* ARC ELF linker hash entry.  */
+struct elf_arc_link_hash_entry
+{
+  struct elf_link_hash_entry root;
+
+  /* Track dynamic relocs copied for this symbol.  */
+  struct elf_dyn_relocs *dyn_relocs;
+
+  struct got_entry *got_ents;
+};
+
+
 /* Should be included at this location due to static declarations
    defined before this point.  */
 #include "arc-got.h"
@@ -281,15 +293,6 @@ struct arc_reloc_map
   unsigned char		    elf_reloc_val;
 };
 
-/* ARC ELF linker hash entry.  */
-struct elf_arc_link_hash_entry
-{
-  struct elf_link_hash_entry root;
-
-  /* Track dynamic relocs copied for this symbol.  */
-  struct elf_dyn_relocs *dyn_relocs;
-};
-
 /* ARC ELF linker hash table.  */
 struct elf_arc_link_hash_table
 {
@@ -301,28 +304,28 @@ elf_arc_link_hash_newfunc (struct bfd_hash_entry *entry,
 			   struct bfd_hash_table *table,
 			   const char *string)
 {
+  struct elf_arc_link_hash_entry * ret =
+    (struct elf_arc_link_hash_entry *) entry;
+
   /* Allocate the structure if it has not already been allocated by a
      subclass.  */
-  if (entry == NULL)
-    {
-      entry = (struct bfd_hash_entry *)
-	  bfd_hash_allocate (table,
-			     sizeof (struct elf_arc_link_hash_entry));
-      if (entry == NULL)
-	return entry;
-    }
+  if (ret == NULL)
+    ret = (struct elf_arc_link_hash_entry *)
+	bfd_hash_allocate (table, sizeof (struct elf_arc_link_hash_entry));
+  if (ret == NULL)
+    return (struct bfd_hash_entry *) ret;
 
   /* Call the allocation method of the superclass.  */
-  entry = _bfd_elf_link_hash_newfunc (entry, table, string);
-  if (entry != NULL)
+  ret = ((struct elf_arc_link_hash_entry *)
+	 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
+				     table, string));
+  if (ret != NULL)
     {
-      struct elf_arc_link_hash_entry *eh;
-
-      eh = (struct elf_arc_link_hash_entry *) entry;
-      eh->dyn_relocs = NULL;
+      ret->dyn_relocs = NULL;
+      ret->got_ents = NULL;
     }
 
-  return entry;
+  return (struct bfd_hash_entry *) ret;
 }
 
 /* Destroy an ARC ELF linker hash table.  */
@@ -352,11 +355,6 @@ arc_elf_link_hash_table_create (bfd *abfd)
       return NULL;
     }
 
-  ret->elf.init_got_refcount.refcount = 0;
-  ret->elf.init_got_refcount.glist = NULL;
-  ret->elf.init_got_offset.offset = 0;
-  ret->elf.init_got_offset.glist = NULL;
-
   ret->elf.root.hash_table_free = elf_arc_link_hash_table_free;
 
   return &ret->elf.root;
@@ -1615,10 +1613,14 @@ elf_arc_relocate_section (bfd *			  output_bfd,
 	  while (h->root.type == bfd_link_hash_indirect
 		 || h->root.type == bfd_link_hash_warning)
 	  {
-	    struct elf_link_hash_entry *h_old = h;
+	    struct elf_arc_link_hash_entry *ah_old =
+	      (struct elf_arc_link_hash_entry *) h;
 	    h = (struct elf_link_hash_entry *) h->root.u.i.link;
-	    if (h->got.glist == 0 && h_old->got.glist != h->got.glist)
-	      h->got.glist = h_old->got.glist;
+	    struct elf_arc_link_hash_entry *ah =
+	      (struct elf_arc_link_hash_entry *) h;
+
+	    if (ah->got_ents == 0 && ah_old->got_ents != ah->got_ents)
+	      ah->got_ents = ah_old->got_ents;
 	  }
 
 	  /* TODO: Need to validate what was the intention.  */
@@ -1636,6 +1638,8 @@ elf_arc_relocate_section (bfd *			  output_bfd,
 
 	      if (is_reloc_for_GOT (howto) && !bfd_link_pic (info))
 		{
+		  struct elf_arc_link_hash_entry *ah =
+		    (struct elf_arc_link_hash_entry *) h;
 		  /* TODO: Change it to use arc_do_relocation with
 		    ARC_32 reloc.  Try to use ADD_RELA macro.  */
 		  bfd_vma relocation =
@@ -1645,8 +1649,8 @@ elf_arc_relocate_section (bfd *			  output_bfd,
 			 + reloc_data.sym_section->output_section->vma)
 		      : 0);
 
-		  BFD_ASSERT (h->got.glist);
-		  bfd_vma got_offset = h->got.glist->offset;
+		  BFD_ASSERT (ah->got_ents);
+		  bfd_vma got_offset = ah->got_ents->offset;
 		  bfd_put_32 (output_bfd, relocation,
 			      htab->sgot->contents + got_offset);
 		}
@@ -1958,6 +1962,7 @@ elf_arc_check_relocs (bfd *			 abfd,
       else /* Global one.  */
 	h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 
+
       switch (r_type)
 	{
 	  case R_ARC_32:
@@ -2404,7 +2409,9 @@ elf_arc_finish_dynamic_symbol (bfd * output_bfd,
      create respective dynamic relocs.  */
   /* TODO: Make function to get list and not access the list directly.  */
   /* TODO: Move function to relocate_section create this relocs eagerly.  */
-  create_got_dynrelocs_for_got_info (&h->got.glist,
+  struct elf_arc_link_hash_entry *ah =
+    (struct elf_arc_link_hash_entry *) h;
+  create_got_dynrelocs_for_got_info (&ah->got_ents,
 				     output_bfd,
 				     info,
 				     h);
-- 
2.14.4