From: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Thu, 9 Jan 2020 17:20:56 +0000 (+0000)
Subject: [PR ld/22269] arm: Avoid dynamic relocs for undefweak symbols in static PIE
X-Git-Url: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff_plain;h=6fbcfe4762c3732339cffd82426d00d35382b858;hp=c06868784d819a45c43947180c69e168aecaf368

[PR ld/22269] arm: Avoid dynamic relocs for undefweak symbols in static PIE

With static PIE linking undefined weak symbols are resolved to 0, so no
dynamic relocation is needed for them. The UNDEFWEAK_NO_DYNAMIC_RELOC
macro was introduced so this case can be handled easily, but it was not
applied consistently in the first attempt to fix ld/22269 for arm:

  commit 95b03e4ad68e7a90f5096b47df595636344b783a
  arm: Check UNDEFWEAK_NO_DYNAMIC_RELOC

This patch fixes spurious relative relocs in static PIE binaries against
GOT entries created for undefined weak symbols on arm*-*, this fixes

FAIL: pr22269-1 (static pie undefined weak)

bfd/ChangeLog:

	Backported from master
	2020-01-10  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	PR ld/22269
	* elf32-arm.c (elf32_arm_final_link_relocate): Use
	UNDEFWEAK_NO_DYNAMIC_RELOC.
	(allocate_dynrelocs_for_symbol): Likewise.
---

diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index cce796d..21cf4b0 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -11572,8 +11572,7 @@ elf32_arm_final_link_relocate (reloc_howto_type *	    howto,
 		  if (dynreloc_st_type == STT_GNU_IFUNC)
 		    outrel.r_info = ELF32_R_INFO (0, R_ARM_IRELATIVE);
 		  else if (bfd_link_pic (info)
-			   && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
-			       || h->root.type != bfd_link_hash_undefweak))
+			   && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
 		    outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
 		  else
 		    {
@@ -16527,8 +16526,7 @@ allocate_dynrelocs_for_symbol (struct elf_link_hash_entry *h, void * inf)
 	       GOT entry's R_ARM_IRELATIVE relocation.  */
 	    elf32_arm_allocate_irelocs (info, htab->root.srelgot, 1);
 	  else if (bfd_link_pic (info)
-		   && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
-		       || h->root.type != bfd_link_hash_undefweak))
+		   && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
 	    /* Reserve room for the GOT entry's R_ARM_RELATIVE relocation.  */
 	    elf32_arm_allocate_dynrelocs (info, htab->root.srelgot, 1);
 	  else if (htab->fdpic_p && tls_type == GOT_NORMAL)