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Inconsistent .eh_frame_hdr on powerpc64
- From: Alan Modra <amodra at gmail dot com>
- To: binutils at sourceware dot org
- Date: Tue, 14 Nov 2017 14:00:10 +1030
- Subject: Inconsistent .eh_frame_hdr on powerpc64
- Authentication-results: sourceware.org; auth=none
There is code in bfd/elf-eh-frame.c and ld/emultempl/elf32.em that
checks for the presence of eh_frame info by testing for a section
named .eh_frame sized more than 8 bytes. The size test is to exclude
a zero terminator. A similar check in elf64-ppc.c wrongly just tested
for non-zero size before creating the linker generated .eh_frame
describing plt call and other linkage stubs. The intention was to not
generate that info unless there was some user .eh_frame. (No user
.eh_frame implies the user doesn't care about exception handling.)
Because the test in elf64-ppc.c was wrong, ld generated the stub
.eh_frame just on finding a zero .eh_frame terminator in crtend.o, but
didn't generate the corresponding .eh_frame_hdr.
* elf64-ppc.c (ppc64_elf_size_stubs): Correct test for user
.eh_frame info.
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 181bbdc..31ee412 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -12700,7 +12700,7 @@ ppc64_elf_size_stubs (struct bfd_link_info *info)
if (htab->glink_eh_frame != NULL
&& !bfd_is_abs_section (htab->glink_eh_frame->output_section)
- && htab->glink_eh_frame->output_section->size != 0)
+ && htab->glink_eh_frame->output_section->size > 8)
{
size_t size = 0, align = 4;
--
Alan Modra
Australia Development Lab, IBM