dyn_relocs tidy

Many targets define their own dyn_relocs struct when they could use
struct elf_dyn_relocs.  This patch tidies that, and uses
readonly_dynrelocs in a few more places.

The SH adjust_dynamic_symbol had some really weird code dating back to
2002 that looked over dynamic relocations for any in SEC_HAS_CONTENTS
or SEC_READONLY sections, rather than just the usual SEC_READONLY
sections.  So basically any dynamic relocation.  What's more, the SH
relocate_section has no support for emitting dynamic relocations in
non-PIC.  In other words, SH has no support for avoiding copy relocs
in non-PIC.  I've made that more obvious by using "if (0 && ..)" in
asjust_dynamic_symbol.

Unfortunately, LM32, M32R, NDS32, and OR1K copied the bogus SH
adjust_dynamic_symbol code.  So none of those targets would have
avoided copy relocs.  LM32, M32R, NDS32 get the "if (0)" treatment
too.  (LM32 is even more broken in that non_got_ref is never set.)

OR1K relocate_section looks like it might support dynamic relocs in
non-PIC, so I've enabled the copy reloc avoidance code for that
target.

	* elf32-hppa.c (struct elf32_hppa_dyn_reloc_entry): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(elf32_hppa_adjust_dynamic_symbol): Comment tidy.
	* elf32-lm32.c (struct elf_lm32_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(lm32_elf_adjust_dynamic_symbol): Use readonly_dynrelocs, but disable.
	Disable -z no-copyreloc too.
	* elf32-m32r.c (struct elf_m32r_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(m32r_elf_adjust_dynamic_symbol): Use readonly_dynrelocs, but disable.
	Disable -z no-copyreloc too.
	* elf32-metag.c (struct elf_metag_dyn_reloc_entry): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(elf_metag_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elf32-microblaze.c (struct elf32_mb_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(readonly_dynrelocs): New function.
	(microblaze_elf_adjust_dynamic_symbol): Use it.
	* elf32-nds32.c (struct elf_nds32_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(nds32_elf_adjust_dynamic_symbol): Use readonly_dynrelocs, but disable.
	Disable -z no-copyreloc too.
	* elf32-nios2.c (struct elf32_nios2_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	* elf32-or1k.c (struct elf_or1k_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(or1k_elf_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elf32-sh.c (struct elf_sh_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(sh_elf_adjust_dynamic_symbol): Use readonly_dynrelocs, but disable.
	Disable -z no-copyreloc too.
	* elf32-tilepro.c (struct tilepro_elf_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(tilepro_elf_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elfnn-riscv.c (struct riscv_elf_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(riscv_elf_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elfxx-sparc.c (struct _bfd_sparc_elf_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(_bfd_sparc_elf_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elfxx-tilegx.c (struct tilegx_elf_dyn_relocs): Delete.  Use
	struct elf_dyn_relocs throughout file instead.
	(tilegx_elf_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elf32-s390.c (elf_s390_adjust_dynamic_symbol): Use readonly_dynrelocs.
	* elf64-s390.c (elf_s390_adjust_dynamic_symbol): Use readonly_dynrelocs.

1 files changed, 31 insertions, 44 deletions

diff --git a/bfd/elf32-microblaze.c b/bfd/elf32-microblaze.c
index 3307a91..f1bea56 100644
--- a/bfd/elf32-microblaze.c
+++ b/bfd/elf32-microblaze.c
@@ -678,26 +678,6 @@ microblaze_elf_is_local_label_name (bfd *abfd, const char *name)
   return _bfd_elf_is_local_label_name (abfd, name);
 }
 
-/* The microblaze linker (like many others) needs to keep track of
-   the number of relocs that it decides to copy as dynamic relocs in
-   check_relocs for each symbol. This is so that it can later discard
-   them if they are found to be unnecessary.  We store the information
-   in a field extending the regular ELF linker hash table.  */
-
-struct elf32_mb_dyn_relocs
-{
-  struct elf32_mb_dyn_relocs *next;
-
-  /* The input section of the reloc.  */
-  asection *sec;
-
-  /* Total number of relocs copied for the input section.  */
-  bfd_size_type count;
-
-  /* Number of pc-relative relocs copied for the input section.  */
-  bfd_size_type pc_count;
-};
-
 /* ELF linker hash entry.  */
 
 struct elf32_mb_link_hash_entry
@@ -705,7 +685,7 @@ struct elf32_mb_link_hash_entry
   struct elf_link_hash_entry elf;
 
   /* Track dynamic relocs copied for this symbol.  */
-  struct elf32_mb_dyn_relocs *dyn_relocs;
+  struct elf_dyn_relocs *dyn_relocs;
 
   /* TLS Reference Types for the symbol; Updated by check_relocs */
 #define TLS_GD     1  /* GD reloc. */
@@ -2429,8 +2409,8 @@ microblaze_elf_check_relocs (bfd * abfd,
                     && (h->root.type == bfd_link_hash_defweak
                         || !h->def_regular)))
               {
-                struct elf32_mb_dyn_relocs *p;
-                struct elf32_mb_dyn_relocs **head;
+                struct elf_dyn_relocs *p;
+                struct elf_dyn_relocs **head;
 
                 /* When creating a shared object, we must copy these
                    relocs into the output file.  We create a reloc
@@ -2474,14 +2454,14 @@ microblaze_elf_check_relocs (bfd * abfd,
 		      return FALSE;
 
 		    vpp = &elf_section_data (s)->local_dynrel;
-		    head = (struct elf32_mb_dyn_relocs **) vpp;
+		    head = (struct elf_dyn_relocs **) vpp;
 		  }
 
 		p = *head;
 		if (p == NULL || p->sec != sec)
 		  {
 		    bfd_size_type amt = sizeof *p;
-		    p = ((struct elf32_mb_dyn_relocs *)
+		    p = ((struct elf_dyn_relocs *)
 			 bfd_alloc (htab->elf.dynobj, amt));
 		    if (p == NULL)
 		      return FALSE;
@@ -2520,8 +2500,8 @@ microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
     {
       if (edir->dyn_relocs != NULL)
 	{
-	  struct elf32_mb_dyn_relocs **pp;
-	  struct elf32_mb_dyn_relocs *p;
+	  struct elf_dyn_relocs **pp;
+	  struct elf_dyn_relocs *p;
 
 	  if (ind->root.type == bfd_link_hash_indirect)
 	    abort ();
@@ -2530,7 +2510,7 @@ microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
 	     list.  Merge any entries against the same section.  */
 	  for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
 	    {
-	      struct elf32_mb_dyn_relocs *q;
+	      struct elf_dyn_relocs *q;
 
 	      for (q = edir->dyn_relocs; q != NULL; q = q->next)
 		if (q->sec == p->sec)
@@ -2555,13 +2535,28 @@ microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info,
   _bfd_elf_link_hash_copy_indirect (info, dir, ind);
 }
 
+/* Find dynamic relocs for H that apply to read-only sections.  */
+
+static asection *
+readonly_dynrelocs (struct elf_link_hash_entry *h)
+{
+  struct elf_dyn_relocs *p;
+
+  for (p = elf32_mb_hash_entry (h)->dyn_relocs; p != NULL; p = p->next)
+    {
+      asection *s = p->sec->output_section;
+
+      if (s != NULL && (s->flags & SEC_READONLY) != 0)
+	return p->sec;
+    }
+  return NULL;
+}
+
 static bfd_boolean
 microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
 				      struct elf_link_hash_entry *h)
 {
   struct elf32_mb_link_hash_table *htab;
-  struct elf32_mb_link_hash_entry * eh;
-  struct elf32_mb_dyn_relocs *p;
   asection *s, *srel;
   unsigned int power_of_two;
 
@@ -2633,17 +2628,9 @@ microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
       return TRUE;
     }
 
-  eh = (struct elf32_mb_link_hash_entry *) h;
-  for (p = eh->dyn_relocs; p != NULL; p = p->next)
-    {
-      s = p->sec->output_section;
-      if (s != NULL && (s->flags & SEC_READONLY) != 0)
-	break;
-    }
-
-  /* If we didn't find any dynamic relocs in read-only sections, then
+  /* If we don't find any dynamic relocs in read-only sections, then
      we'll be keeping the dynamic relocs and avoiding the copy reloc.  */
-  if (p == NULL)
+  if (!readonly_dynrelocs (h))
     {
       h->non_got_ref = 0;
       return TRUE;
@@ -2710,7 +2697,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat)
   struct bfd_link_info *info;
   struct elf32_mb_link_hash_table *htab;
   struct elf32_mb_link_hash_entry *eh;
-  struct elf32_mb_dyn_relocs *p;
+  struct elf_dyn_relocs *p;
 
   if (h->root.type == bfd_link_hash_indirect)
     return TRUE;
@@ -2843,7 +2830,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat)
 	  && (h->forced_local
 	      || info->symbolic))
 	{
-	  struct elf32_mb_dyn_relocs **pp;
+	  struct elf_dyn_relocs **pp;
 
 	  for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
 	    {
@@ -2935,9 +2922,9 @@ microblaze_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
 
       for (s = ibfd->sections; s != NULL; s = s->next)
 	{
-	  struct elf32_mb_dyn_relocs *p;
+	  struct elf_dyn_relocs *p;
 
-	  for (p = ((struct elf32_mb_dyn_relocs *)
+	  for (p = ((struct elf_dyn_relocs *)
 		    elf_section_data (s)->local_dynrel);
 	       p != NULL;
 	       p = p->next)