Hi,
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.
Martin
openssl/crypto/armv4cpuid.S:
.global _armv7_neon_probe
.type _armv7_neon_probe,%function
_armv7_neon_probe:
.word 0xf26ee1fe @ vorr q15,q15,q15
.word 0xe12fff1e @ bx lr
.size _armv7_neon_probe,.-_armv7_neon_probe
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