Commit e4c542a8 authored Jun 28, 2016 by Vineet Gupta Committed by Sasha Levin Jul 12, 2016

ARC: unwind: ensure that .debug_frame is generated (vs. .eh_frame)



[ Upstream commit f52e126cc7476196f44f3c313b7d9f0699a881fc ]

With recent binutils update to support dwarf CFI pseudo-ops in gas, we
now get .eh_frame vs. .debug_frame. Although the call frame info is
exactly the same in both, the CIE differs, which the current kernel
unwinder can't cope with.

This broke both the kernel unwinder as well as loadable modules (latter
because of a new unhandled relo R_ARC_32_PCREL from .rela.eh_frame in
the module loader)

The ideal solution would be to switch unwinder to .eh_frame.
For now however we can make do by just ensureing .debug_frame is
generated by removing -fasynchronous-unwind-tables

 .eh_frame    generated with -gdwarf-2 -fasynchronous-unwind-tables
 .debug_frame generated with -gdwarf-2

Fixes STAR 9001058196

Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent 0c0ad079

arch/arc/Makefile

+0 −1

Original line number	Diff line number	Diff line
		@@ -34,7 +34,6 @@ cflags-$(atleast_gcc44) += -fsection-anchors
		cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
		cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
		cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
		cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables

		# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
		ifeq ($(atleast_gcc48),y)