[PATCH 0/3] riscv: Fix debug instruction check and support trap-based WARN()

From: Vincent Chen
Date: Thu Feb 28 2019 - 05:57:34 EST

The handler for the debug exception will call is_valid_bugaddr(bugaddr) to
check if the instruction in bugaddr is a real debug instruction. However,
the expected instruction, ebreak, is possibly translated to c.ebreak by
assmebler when C extension is supported. This patchset will add c.ebreak
into the check mechanism. In addition, BUG() is currently unable to work in
the kernel module due to an inappropriated condition in is_valid_bugaddr().
This issue will be fixed in this patchset. Finally, this patchset enables
WARN() related functions to trap the code to help developers debug it.

Vincent Chen (3):
riscv: Add the support for c.ebreak check in is_valid_bugaddr()
riscv: Support BUG() in kernel module
riscv: Make WARN() related functions able to trigger a trap exception