Hexagon: add support for single-stepping (v4+)

Hardware single-step is only available on v4 and later
architectures.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index 12164a30e8ff..c2eeeef55335 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -451,3 +451,14 @@ void do_machcheck(struct pt_regs *regs)
 	/* Halt and catch fire */
 	__vmstop();
 }
+
+/*
+ * Treat this like the old 0xdb trap.
+ */
+
+void do_debug_exception(struct pt_regs *regs)
+{
+	regs->hvmer.vmest &= ~HVM_VMEST_CAUSE_MSK;
+	regs->hvmer.vmest |= (TRAP_DEBUG << HVM_VMEST_CAUSE_SFT);
+	do_trap0(regs);
+}