PR ld/12570

include/
	* bfdlink.h (struct bfd_link_info): Add no_ld_generated_unwind_info
	option.
ld/
	* emultempl/elf32.em (OPTION_LD_GENERATED_UNWIND_INFO,
	OPTION_NO_LD_GENERATED_UNWIND_INFO): Define.
	(gld${EMULATION_NAME}_handle_option): Handle
	--ld-generated-unwind-info and --no-ld-generated-unwind-info.
	* ld.texinfo (--ld-generated-unwind-info,
	--no-ld-generated-unwind-info): Document.
bfd/
	* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Allow no relocations
	at all for linker created .eh_frame sections.
	(_bfd_elf_discard_section_eh_frame): Handle linker created
	.eh_frame sections with no relocations.
	* elf64-x86-64.c: Include dwarf2.h.
	(elf_x86_64_eh_frame_plt): New variable.
	(PLT_CIE_LENGTH, PLT_FDE_LENGTH, PLT_FDE_START_OFFSET,
	PLT_FDE_LEN_OFFSET): Define.
	(struct elf_x86_64_link_hash_table): Add plt_eh_frame field.
	(elf_x86_64_create_dynamic_sections): Create and fill in
	.eh_frame section for .plt section.
	(elf_x86_64_size_dynamic_sections): Write .plt section size
	into .eh_frame FDE covering .plt section.
	(elf_x86_64_finish_dynamic_sections): Write .plt section
	start into .eh_frame FDE covering .plt section.  Call
	_bfd_elf_write_section_eh_frame on htab->plt_eh_frame section.
	(elf_backend_plt_alignment): Define to 4.
	* elf32-i386.c: Include dwarf2.h.
	(elf_i386_eh_frame_plt): New variable.
	(PLT_CIE_LENGTH, PLT_FDE_LENGTH, PLT_FDE_START_OFFSET,
	PLT_FDE_LEN_OFFSET): Define.
	(struct elf_i386_link_hash_table): Add plt_eh_frame field.
	(elf_i386_create_dynamic_sections): Create and fill in
	.eh_frame section for .plt section.
	(elf_i386_size_dynamic_sections): Write .plt section size
	into .eh_frame FDE covering .plt section.
	(elf_i386_finish_dynamic_sections): Write .plt section
	start into .eh_frame FDE covering .plt section.  Call
	_bfd_elf_write_section_eh_frame on htab->plt_eh_frame section.
	(elf_backend_plt_alignment): Define to 4.
ld/testsuite/
	* ld-x86-64/x86-64.exp: Link some testcases with
	--no-ld-generated-unwind-info.
	* ld-x86-64/tlsbin.rd: Add --no-ld-generated-unwind-info to ld
	comment.
	* ld-x86-64/tlsdesc.dd: Likewise.
	* ld-x86-64/tlspic.dd: Likewise.
	* ld-x86-64/tlsdesc.sd: Likewise.
	* ld-x86-64/tlspic.rd: Likewise.
	* ld-x86-64/tlsbindesc.rd: Likewise.
	* ld-x86-64/tlsbindesc.sd: Likewise.
	* ld-x86-64/tlsbin.td: Likewise.
	* ld-x86-64/tlsdesc.pd: Likewise.
	* ld-x86-64/tlsdesc.td: Likewise.
	* ld-x86-64/tlsbindesc.dd: Likewise.
	* ld-x86-64/tlsbin.dd: Likewise.
	* ld-x86-64/tlsgdesc.rd: Likewise.
	* ld-x86-64/tlspic.sd: Likewise.
	* ld-x86-64/tlsbindesc.td: Likewise.
	* ld-x86-64/tlspic.td: Likewise.
	* ld-x86-64/tlsbin.sd: Likewise.
	* ld-x86-64/ilp32-4.d: Likewise.
	* ld-x86-64/tlsgdesc.dd: Add --no-ld-generated-unwind-info to ld
	comment.  Adjust.
	* ld-x86-64/tlsdesc.rd: Likewise.
	* ld-x86-64/tlsgd6.dd: Adjust.
	* ld-x86-64/tlsgd5.dd: Likewise.
	* ld-i386/i386.exp: Link some testcases with
	--no-ld-generated-unwind-info.
	* ld-i386/tlsbin.rd: Add --no-ld-generated-unwind-info to ld
	comment..
	* ld-i386/tlsdesc.dd: Likewise.
	* ld-i386/tlspic.dd: Likewise.
	* ld-i386/tlsdesc.sd: Likewise.
	* ld-i386/tlsgdesc.dd: Likewise.
	* ld-i386/tlsnopic.sd: Likewise.
	* ld-i386/tlspic.rd: Likewise.
	* ld-i386/tlsdesc.rd: Likewise.
	* ld-i386/tlsbindesc.rd: Likewise.
	* ld-i386/tlsbindesc.sd: Likewise.
	* ld-i386/tlsbin.td: Likewise.
	* ld-i386/tlsdesc.td: Likewise.
	* ld-i386/tlsnopic.dd: Likewise.
	* ld-i386/tlsbindesc.dd: Likewise.
	* ld-i386/tlsbin.dd: Likewise.
	* ld-i386/tlsgdesc.rd: Likewise.
	* ld-i386/tlspic.sd: Likewise.
	* ld-i386/tlsnopic.rd: Likewise.
	* ld-i386/tlsbindesc.td: Likewise.
	* ld-i386/tlspic.td: Likewise.
	* ld-i386/tlsbin.sd: Likewise.

1 files changed, 37 insertions, 19 deletions

diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c
index 21041a5..54142b2 100644
--- a/bfd/elf-eh-frame.c
+++ b/bfd/elf-eh-frame.c
@@ -778,8 +778,6 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
 	}
       else
 	{
-	  asection *rsec;
-
 	  /* Find the corresponding CIE.  */
 	  unsigned int cie_offset = this_inf->offset + 4 - hdr_id;
 	  for (cie = local_cies; cie < local_cies + cie_count; cie++)
@@ -795,17 +793,22 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
 	    = cie->cie_inf->add_augmentation_size;
 
 	  ENSURE_NO_RELOCS (buf);
-	  REQUIRE (GET_RELOC (buf));
-
-	  /* Chain together the FDEs for each section.  */
-	  rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
-	  /* RSEC will be NULL if FDE was cleared out as it was belonging to
-	     a discarded SHT_GROUP.  */
-	  if (rsec)
+	  if ((sec->flags & SEC_LINKER_CREATED) == 0 || cookie->rels != NULL)
 	    {
-	      REQUIRE (rsec->owner == abfd);
-	      this_inf->u.fde.next_for_section = elf_fde_list (rsec);
-	      elf_fde_list (rsec) = this_inf;
+	      asection *rsec;
+
+	      REQUIRE (GET_RELOC (buf));
+
+	      /* Chain together the FDEs for each section.  */
+	      rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
+	      /* RSEC will be NULL if FDE was cleared out as it was belonging to
+		 a discarded SHT_GROUP.  */
+	      if (rsec)
+		{
+		  REQUIRE (rsec->owner == abfd);
+		  this_inf->u.fde.next_for_section = elf_fde_list (rsec);
+		  elf_fde_list (rsec) = this_inf;
+		}
 	    }
 
 	  /* Skip the initial location and address range.  */
@@ -1141,6 +1144,9 @@ _bfd_elf_discard_section_eh_frame
   if (sec_info == NULL)
     return FALSE;
 
+  ptr_size = (get_elf_backend_data (sec->owner)
+	      ->elf_backend_eh_frame_address_size (sec->owner, sec));
+
   hdr_info = &elf_hash_table (info)->eh_info;
   for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent)
     if (ent->size == 4)
@@ -1149,11 +1155,25 @@ _bfd_elf_discard_section_eh_frame
       ent->removed = sec->map_head.s != NULL;
     else if (!ent->cie)
       {
-	cookie->rel = cookie->rels + ent->reloc_index;
-	/* FIXME: octets_per_byte.  */
-	BFD_ASSERT (cookie->rel < cookie->relend
-		    && cookie->rel->r_offset == ent->offset + 8);
-	if (!(*reloc_symbol_deleted_p) (ent->offset + 8, cookie))
+	bfd_boolean keep;
+	if ((sec->flags & SEC_LINKER_CREATED) != 0 && cookie->rels == NULL)
+	  {
+	    unsigned int width
+	      = get_DW_EH_PE_width (ent->fde_encoding, ptr_size);
+	    bfd_vma value
+	      = read_value (abfd, sec->contents + ent->offset + 8 + width,
+			    width, get_DW_EH_PE_signed (ent->fde_encoding));
+	    keep = value != 0;
+	  }
+	else
+	  {
+	    cookie->rel = cookie->rels + ent->reloc_index;
+	    /* FIXME: octets_per_byte.  */
+	    BFD_ASSERT (cookie->rel < cookie->relend
+			&& cookie->rel->r_offset == ent->offset + 8);
+	    keep = !(*reloc_symbol_deleted_p) (ent->offset + 8, cookie);
+	  }
+	if (keep)
 	  {
 	    if (info->shared
 		&& (((ent->fde_encoding & 0x70) == DW_EH_PE_absptr
@@ -1182,8 +1202,6 @@ _bfd_elf_discard_section_eh_frame
       sec_info->cies = NULL;
     }
 
-  ptr_size = (get_elf_backend_data (sec->owner)
-	      ->elf_backend_eh_frame_address_size (sec->owner, sec));
   offset = 0;
   for (ent = sec_info->entry; ent < sec_info->entry + sec_info->count; ++ent)
     if (!ent->removed)