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323f41f9e7
linux/arch/arc
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Vineet Gupta 323f41f9e7 ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing 
ARC dwarf unwinder only supports CIE version == 1
The boot time dwarf sanitizer (part of binary lookup table constructor)
would simply bail if it saw CIE version == 3, rendering unwinder with a
NULL lookup table.

It seems libgcc linked with kernel does have such entries.

With fallback linear search removed, and a NULL binary lookup table,
unwinder fails to generate any stack trace.

So allow graceful ignoring of unsupported CIE entries.

This problem was initially seen in Alexey's setup (and not mine) as he
was using buildroot built toolchain (libgcc) which doesn't get built with
CFLAGS_FOR_TARGET="-gdwarf-2 which is my default

Fixes STAR 9000985048: "kernel unwinder broken with stock tools"

Fixes: 2e22502c08 ARC: dw2 unwind: Remove falllback linear search thru FDE entries
Reported-by Alexey Brodkin <abrodkin@synopsys.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2015-12-17 11:10:23 +05:30
..
boot ARC: [plat-sim] unbork non default CONFIG_LINUX_LINK_BASE 2015-12-17 11:06:43 +05:30
configs ARC: switch to arc-linux- CROSS_COMPILE prefix across all configs 2015-11-16 12:00:09 +05:30
include ARC: dw2 unwind: Reinstante unwinding out of modules 2015-12-17 11:10:23 +05:30
kernel ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing 2015-12-17 11:10:23 +05:30
lib ARCv2: lib: memcpy: use local symbols 2015-11-03 17:33:00 +05:30
mm ARC: [plat-sim] unbork non default CONFIG_LINUX_LINK_BASE 2015-12-17 11:06:43 +05:30
oprofile ARC: OProfile support 2013-02-15 23:16:00 +05:30
plat-axs10x ARCv2: smp: [plat-*]: No need to explicitly call mcip_init_smp() 2015-10-28 16:13:41 +05:30
plat-sim ARC: remove extraneous header include 2015-11-14 13:11:38 +05:30
plat-tb10x ARC: [plat*] move code out of .init_machine into common 2014-10-13 14:46:13 +05:30
Kbuild
Kconfig ARC: [plat-sim] unbork non default CONFIG_LINUX_LINK_BASE 2015-12-17 11:06:43 +05:30
Kconfig.debug ARC: With earlycon in use, retire EARLY_PRINTK 2015-05-11 11:20:21 +05:30
Makefile arc: use common make variables for dtb builds 2015-10-27 16:12:13 -05:00