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arch: add exception fault info print support

Nishant Sharma requested to merge ns/exception_fault_info_print into main

ARMv6, ARMv7 and ARMv8 exception model supports system exception and external interrupts. Few of the system exceptions are used for capturing faults. This information provides the address location where fault has occurred and the reason of the fault and is handy while fixing the bugs.

Add the support to print the fault information for memory, bus, user, hard and secure faults. Also add the support to print r0, r1, r2, r3, r12, r14, PC, and xPSR registers stored the stack.

Secure fault handling is handled only if security extensions are enabled on the platform. Secure fault handling is guarded by __ARM_FEATURE_CMSE and can be enabled by setting -mcmse while compiling.

Signed-off-by: Nishant Sharma nishant.sharma@arm.com Change-Id: I36f4aa84

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