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

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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:

	PR ld/22269
	* elf32-arm.c (elf32_arm_final_link_relocate): Use
	UNDEFWEAK_NO_DYNAMIC_RELOC.
	(allocate_dynrelocs_for_symbol): Likewise.
This commit is contained in:
Szabolcs Nagy
2020-01-09 17:20:56 +00:00
parent 8cd0e5e931
commit 7f02673206
2 changed files with 9 additions and 4 deletions
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7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
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.
2020-01-10 Tamar Christina <tamar.christina@arm.com> 2020-01-10 Tamar Christina <tamar.christina@arm.com>
PR 25210 PR 25210

6
bfd/elf32-arm.c
View File

@ -11578,8 +11578,7 @@ elf32_arm_final_link_relocate (reloc_howto_type * howto,
if (dynreloc_st_type == STT_GNU_IFUNC) if (dynreloc_st_type == STT_GNU_IFUNC)
outrel.r_info = ELF32_R_INFO (0, R_ARM_IRELATIVE); outrel.r_info = ELF32_R_INFO (0, R_ARM_IRELATIVE);
else if (bfd_link_pic (info) else if (bfd_link_pic (info)
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
|| h->root.type != bfd_link_hash_undefweak))
outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
else else
{ {
@ -16452,8 +16451,7 @@ allocate_dynrelocs_for_symbol (struct elf_link_hash_entry *h, void * inf)
GOT entry's R_ARM_IRELATIVE relocation. */ GOT entry's R_ARM_IRELATIVE relocation. */
elf32_arm_allocate_irelocs (info, htab->root.srelgot, 1); elf32_arm_allocate_irelocs (info, htab->root.srelgot, 1);
else if (bfd_link_pic (info) else if (bfd_link_pic (info)
&& (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
|| h->root.type != bfd_link_hash_undefweak))
/* Reserve room for the GOT entry's R_ARM_RELATIVE relocation. */ /* Reserve room for the GOT entry's R_ARM_RELATIVE relocation. */
elf32_arm_allocate_dynrelocs (info, htab->root.srelgot, 1); elf32_arm_allocate_dynrelocs (info, htab->root.srelgot, 1);
else if (htab->fdpic_p && tls_type == GOT_NORMAL) else if (htab->fdpic_p && tls_type == GOT_NORMAL)