Hi,
On Fri Jan 24, 2014 at 17:04:00 +0100, Martin Schröder wrote:
I have a piece of code running fine on native Linux, but terminating unexpected with SIGSEGV while running on l4linux on the same piece of hardware.
The relevant code is in _armv7_neon_probe "vorr q15,q15,q15" (undefined instruction on ARMv5) which normally would throw SIGILL and thus being caught in the caller.
With CONFIG_L4_DEBUG_SEGFAULTS enabled, the exception is correctly printed as
CPSR: 6000010 Err: 00100000 MyApp/171: Undefined instruction at 0007c7e0 with content
f26ee1fe, err 00100000
Unfortunately, when I look into l4linux/arch/l4/kernal/signal.c in l4x_deliver_signal(), errcode is not used at all and so IGSEGV will always be sent, regardless of the exceptions.
Thanks, I think I see the problem. Do you have CONFIG_VFP enabled in either Linux version?
Adam