ELF: Call check_relocs after opening all inputs

For all ELF targers, call check_relocs after opening all inputs and
garbage collection.  Since the symbol resolution is known, check_relocs
can be simplified.  Also garbage collection doesn't need to undo what
check_relocs has done for symbols which have been garbage collected.
Since ELF targets never see the removed sections, gc_sweep_hook can be
removed from elf_backend_data and we can avoid GOT/PLT with garbage
collection now.

Set link_info.check_relocs_after_open_input to TRUE for all linker
targets which use ELF linker and update garbage collection tests to
remove unused GOT section.

ldemul_after_check_relocs is added for powerpc to support --secure-plt,
--bss-plt and --sdata-got.

Tested natively without regressions on i686, x86-64 and x32.  Tested
cross binutils on x86-64 without regressions for aarch64-linux,
alpha-linux, arm-linux, bfin-elf, cr16-elf, cris-elf, crx-elf, frv-linux,
hppa64-linux, hppa-linux, ia64-linux, lm32-elf, m32r-elf, m68k-linux,
mcore-elf, metag-elf, microblaze-linux, mips-linux, mmix, mn10300-elf,
nds32le-linux, nios2-linux, or1k-elf, powerpc64-linux, powerpc-linux,
riscv32-linux, riscv64-linux, s390-linux, s390x-linux, score-elf,
sh3-linux, sparc64-linux, sparc-linux, tic6x-elf, tilegx-linux,
tilepro-linux, vax-linux, x86_64-mingw32 and xtensa-linux.

bfd/

	* elf-bfd.h (elf_backend_data): Remove gc_sweep_hook.
	* elf32-arm.c (elf32_arm_gc_sweep_hook): Removed.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-bfin.c (bfin_gc_sweep_hook): Likewise.
	(bfinfdpic_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-cr16.c (elf32_cr16_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-cris.c (cris_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-hppa.c (elf32_hppa_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-lm32.c (lm32_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-m32r.c (m32r_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-m68k.c (elf_m68k_got_entry): Remove elf_m68k_gc_sweep_hook
	from comments.
	(elf_m68k_remove_got_entry_type): Removed.
	(elf_m68k_find_got_entry_ptr): Likewise.
	(elf_m68k_remove_got_entry): Likewise.
	(elf_m68k_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-mcore.c (mcore_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-metag.c (elf_metag_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-microblaze.c (elf_backend_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-mips.c (elf_backend_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-nds32.c (nds32_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-nios2.c (nios2_elf32_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-or1k.c (or1k_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-ppc.c (ppc_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-s390.c (elf_s390_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-sparc.c (elf_backend_gc_sweep_hook): Likewise.
	* elf32-tic6x.c (elf32_tic6x_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-tilegx.c (elf_backend_gc_sweep_hook): Likewise.
	* elf32-tilepro.c (tilepro_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-vax.c (elf_vax_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf32-xtensa.c (elf_xtensa_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf64-alpha.c (elf64_alpha_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf64-mips.c (elf_backend_gc_sweep_hook): Likewise.
	* elf64-mmix.c (mmix_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf64-ppc.c (elf_backend_gc_sweep_hook): Likewise.
	(ppc64_elf_gc_sweep_hook): Likewise.
	* elf64-s390.c (elf_s390_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elf64-sparc.c (elf_backend_gc_sweep_hook): Likewise.
	* elf64-tilegx.c (elf_backend_gc_sweep_hook): Likewise.
	* elflink.c (elf_link_add_object_symbols): Don't call
	_bfd_elf_link_check_relocs here.
	(gc_sweep_hook_fn): Removed.
	(elf_gc_sweep): Remove gc_sweep_hook.
	* elfnn-aarch64.c (elfNN_aarch64_gc_sweep_hook): Removed.
	(elf_backend_gc_sweep_hook): Likewise.
	* elfnn-riscv.c (riscv_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elfxx-mips.c (_bfd_mips_elf_gc_sweep_hook): Likewise.
	* elfxx-mips.h (_bfd_mips_elf_gc_sweep_hook): Likewise.
	(elf_backend_gc_sweep_hook): Likewise.
	* elfxx-sparc.c (_bfd_sparc_elf_gc_sweep_hook): Likewise.
	* elfxx-sparc.h (_bfd_sparc_elf_gc_sweep_hook): Likewise.
	* elfxx-target.h (elf_backend_gc_sweep_hook): Likewise.
	(elfNN_bed): Remove elf_backend_gc_sweep_hook.
	* elfxx-tilegx.c (tilegx_elf_gc_sweep_hook): Removed.
	* elfxx-tilegx.h (tilegx_elf_gc_sweep_hook): Likewise.

ld/

	* emulparams/elf32_x86_64.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Removed.
	* emulparams/elf_i386_be.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_i386_chaos.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_i386_ldso.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_i386_vxworks.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_iamcu.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_k1om.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_l1om.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/elf_x86_64.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/i386lynx.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/i386moss.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/i386nto.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/i386nw.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shelf.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shelf32.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shelf_nto.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shelf_vxworks.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shlelf32_linux.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shlelf_linux.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emulparams/shlelf_nto.sh (CHECK_RELOCS_AFTER_OPEN_INPUT):
	Likewise.
	* emultempl/aarch64elf.em (gld${EMULATION_NAME}_before_parse):
	Set link_info.check_relocs_after_open_input to TRUE.
	* emultempl/armelf.em (gld${EMULATION_NAME}_before_parse):
	Likewise.
	* emultempl/scoreelf.em (gld${EMULATION_NAME}_before_parse):
	Likewise.
	* emultempl/aix.em (ld_${EMULATION_NAME}_emulation): Add
	after_parse_default.
	* emultempl/armcoff.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/beos.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/generic.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/gld960.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/gld960c.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/lnk960.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/m68kcoff.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/msp430.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/pe.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/pep.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/sunos.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/ticoff.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/vanilla.em (ld_${EMULATION_NAME}_emulation): Likewise.
	* emultempl/elf32.em (gld${EMULATION_NAME}_before_parse): Always
	set link_info.check_relocs_after_open_input to TRUE.
	(ld_${EMULATION_NAME}_emulation): Add $LDEMUL_AFTER_CHECK_RELOCS.
	* emultempl/linux.em (gld${EMULATION_NAME}_before_parse):
	Set link_info.check_relocs_after_open_input to TRUE.
	(ld_${EMULATION_NAME}_emulation): Add after_check_relocs_default.
	* emultempl/mmix-elfnmmo.em (mmix_before_parse): New function.
	(LDEMUL_BEFORE_PARSE): New.
	* emultempl/mmixelf.em (elfmmix_before_parse): Replace
	gld${EMULATION_NAME}_before_parse with mmix_before_parse.
	* emultempl/ppc32elf.em (ppc_after_open): Renamed to ...
	(ppc_after_check_relocs): This.  Call after_check_relocs_default
	instead of gld${EMULATION_NAME}_after_open.
	(LDEMUL_AFTER_OPEN): Removed.
	(LDEMUL_AFTER_CHECK_RELOCS): New.
	* ldemul.c (ldemul_after_check_relocs): New.
	(after_check_relocs_default): Likewise.
	* ldemul.h (ldemul_after_check_relocs): Likewise.
	(after_check_relocs_default): Likewise.
	(ld_emulation_xfer_struct): Add after_check_relocs.
	* ldlang.c (lang_process): Call ldemul_after_check_relocs after
	lang_check_relocs.
	* testsuite/ld-aarch64/gc-got-relocs.d: Don't expect GOT section.
	* testsuite/ld-aarch64/gc-tls-relocs.d: Likewise.
	* testsuite/ld-cris/tls-gc-68.d: Likewise.
	* testsuite/ld-cris/tls-gc-69.d: Likewise.
	* testsuite/ld-cris/tls-gc-70.d: Likewise.
	* testsuite/ld-cris/tls-gc-75.d: Likewise.
	* testsuite/ld-cris/tls-gc-79.d: Likewise.
	* testsuite/ld-mmix/bpo-10.d: Don't expect .MMIX.reg_contents
	section.

1 files changed, 0 insertions, 194 deletions

diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 1e78c7a..23c7664 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -14297,199 +14297,6 @@ elf32_arm_gc_mark_hook (asection *sec,
   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
 }
 
-/* Update the got entry reference counts for the section being removed.  */
-
-static bfd_boolean
-elf32_arm_gc_sweep_hook (bfd *                     abfd,
-			 struct bfd_link_info *    info,
-			 asection *                sec,
-			 const Elf_Internal_Rela * relocs)
-{
-  Elf_Internal_Shdr *symtab_hdr;
-  struct elf_link_hash_entry **sym_hashes;
-  bfd_signed_vma *local_got_refcounts;
-  const Elf_Internal_Rela *rel, *relend;
-  struct elf32_arm_link_hash_table * globals;
-
-  if (bfd_link_relocatable (info))
-    return TRUE;
-
-  globals = elf32_arm_hash_table (info);
-  if (globals == NULL)
-    return FALSE;
-
-  elf_section_data (sec)->local_dynrel = NULL;
-
-  symtab_hdr = & elf_symtab_hdr (abfd);
-  sym_hashes = elf_sym_hashes (abfd);
-  local_got_refcounts = elf_local_got_refcounts (abfd);
-
-  check_use_blx (globals);
-
-  relend = relocs + sec->reloc_count;
-  for (rel = relocs; rel < relend; rel++)
-    {
-      unsigned long r_symndx;
-      struct elf_link_hash_entry *h = NULL;
-      struct elf32_arm_link_hash_entry *eh;
-      int r_type;
-      bfd_boolean call_reloc_p;
-      bfd_boolean may_become_dynamic_p;
-      bfd_boolean may_need_local_target_p;
-      union gotplt_union *root_plt;
-      struct arm_plt_info *arm_plt;
-
-      r_symndx = ELF32_R_SYM (rel->r_info);
-      if (r_symndx >= symtab_hdr->sh_info)
-	{
-	  h = sym_hashes[r_symndx - symtab_hdr->sh_info];
-	  while (h->root.type == bfd_link_hash_indirect
-		 || h->root.type == bfd_link_hash_warning)
-	    h = (struct elf_link_hash_entry *) h->root.u.i.link;
-	}
-      eh = (struct elf32_arm_link_hash_entry *) h;
-
-      call_reloc_p = FALSE;
-      may_become_dynamic_p = FALSE;
-      may_need_local_target_p = FALSE;
-
-      r_type = ELF32_R_TYPE (rel->r_info);
-      r_type = arm_real_reloc_type (globals, r_type);
-      switch (r_type)
-	{
-	case R_ARM_GOT32:
-	case R_ARM_GOT_PREL:
-	case R_ARM_TLS_GD32:
-	case R_ARM_TLS_IE32:
-	  if (h != NULL)
-	    {
-	      if (h->got.refcount > 0)
-		h->got.refcount -= 1;
-	    }
-	  else if (local_got_refcounts != NULL)
-	    {
-	      if (local_got_refcounts[r_symndx] > 0)
-		local_got_refcounts[r_symndx] -= 1;
-	    }
-	  break;
-
-	case R_ARM_TLS_LDM32:
-	  globals->tls_ldm_got.refcount -= 1;
-	  break;
-
-	case R_ARM_PC24:
-	case R_ARM_PLT32:
-	case R_ARM_CALL:
-	case R_ARM_JUMP24:
-	case R_ARM_PREL31:
-	case R_ARM_THM_CALL:
-	case R_ARM_THM_JUMP24:
-	case R_ARM_THM_JUMP19:
-	  call_reloc_p = TRUE;
-	  may_need_local_target_p = TRUE;
-	  break;
-
-	case R_ARM_ABS12:
-	  if (!globals->vxworks_p)
-	    {
-	      may_need_local_target_p = TRUE;
-	      break;
-	    }
-	  /* Fall through.  */
-	case R_ARM_ABS32:
-	case R_ARM_ABS32_NOI:
-	case R_ARM_REL32:
-	case R_ARM_REL32_NOI:
-	case R_ARM_MOVW_ABS_NC:
-	case R_ARM_MOVT_ABS:
-	case R_ARM_MOVW_PREL_NC:
-	case R_ARM_MOVT_PREL:
-	case R_ARM_THM_MOVW_ABS_NC:
-	case R_ARM_THM_MOVT_ABS:
-	case R_ARM_THM_MOVW_PREL_NC:
-	case R_ARM_THM_MOVT_PREL:
-	  /* Should the interworking branches be here also?  */
-	  if ((bfd_link_pic (info) || globals->root.is_relocatable_executable)
-	      && (sec->flags & SEC_ALLOC) != 0)
-	    {
-	      if (h == NULL
-		  && elf32_arm_howto_from_type (r_type)->pc_relative)
-		{
-		  call_reloc_p = TRUE;
-		  may_need_local_target_p = TRUE;
-		}
-	      else
-		may_become_dynamic_p = TRUE;
-	    }
-	  else
-	    may_need_local_target_p = TRUE;
-	  break;
-
-	default:
-	  break;
-	}
-
-      if (may_need_local_target_p
-	  && elf32_arm_get_plt_info (abfd, globals, eh, r_symndx, &root_plt,
-				     &arm_plt))
-	{
-	  /* If PLT refcount book-keeping is wrong and too low, we'll
-	     see a zero value (going to -1) for the root PLT reference
-	     count.  */
-	  if (root_plt->refcount >= 0)
-	    {
-	      BFD_ASSERT (root_plt->refcount != 0);
-	      root_plt->refcount -= 1;
-	    }
-	  else
-	    /* A value of -1 means the symbol has become local, forced
-	       or seeing a hidden definition.  Any other negative value
-	       is an error.  */
-	    BFD_ASSERT (root_plt->refcount == -1);
-
-	  if (!call_reloc_p)
-	    arm_plt->noncall_refcount--;
-
-	  if (r_type == R_ARM_THM_CALL)
-	    arm_plt->maybe_thumb_refcount--;
-
-	  if (r_type == R_ARM_THM_JUMP24
-	      || r_type == R_ARM_THM_JUMP19)
-	    arm_plt->thumb_refcount--;
-	}
-
-      if (may_become_dynamic_p)
-	{
-	  struct elf_dyn_relocs **pp;
-	  struct elf_dyn_relocs *p;
-
-	  if (h != NULL)
-	    pp = &(eh->dyn_relocs);
-	  else
-	    {
-	      Elf_Internal_Sym *isym;
-
-	      isym = bfd_sym_from_r_symndx (&globals->sym_cache,
-					    abfd, r_symndx);
-	      if (isym == NULL)
-		return FALSE;
-	      pp = elf32_arm_get_local_dynreloc_list (abfd, r_symndx, isym);
-	      if (pp == NULL)
-		return FALSE;
-	    }
-	  for (; (p = *pp) != NULL; pp = &p->next)
-	    if (p->sec == sec)
-	      {
-		/* Everything must go for SEC.  */
-		*pp = p->next;
-		break;
-	      }
-	}
-    }
-
-  return TRUE;
-}
-
 /* Look through the relocs for a section during the first phase.  */
 
 static bfd_boolean
@@ -19400,7 +19207,6 @@ elf32_arm_backend_symbol_processing (bfd *abfd, asymbol *sym)
 #define elf_backend_get_symbol_type             elf32_arm_get_symbol_type
 #define elf_backend_gc_mark_hook                elf32_arm_gc_mark_hook
 #define elf_backend_gc_mark_extra_sections	elf32_arm_gc_mark_extra_sections
-#define elf_backend_gc_sweep_hook               elf32_arm_gc_sweep_hook
 #define elf_backend_check_relocs                elf32_arm_check_relocs
 #define elf_backend_update_relocs		elf32_arm_update_relocs
 #define elf_backend_relocate_section		elf32_arm_relocate_section