[PATCH v1 09/14] xen/riscv: introduce do_unexpected_trap()

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

The patch introduces the function the purpose of which is to print
a cause of an exception and call "wfi" instruction.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/riscv/traps.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/xen/arch/riscv/traps.c b/xen/arch/riscv/traps.c
index dd64f053a5..fc25138a4b 100644
--- a/xen/arch/riscv/traps.c
+++ b/xen/arch/riscv/traps.c
@@ -95,7 +95,19 @@ const char *decode_cause(unsigned long cause)
     return decode_trap_cause(cause);
 }
 
-void __handle_exception(struct cpu_user_regs *cpu_regs)
+static void do_unexpected_trap(const struct cpu_user_regs *regs)
 {
+    unsigned long cause = csr_read(CSR_SCAUSE);
+
+    early_printk("Unhandled exception: ");
+    early_printk(decode_cause(cause));
+    early_printk("\n");
+
+    // kind of die...
     wait_for_interrupt();
 }
+
+void __handle_exception(struct cpu_user_regs *cpu_regs)
+{
+    do_unexpected_trap(cpu_regs);
+}
-- 
2.39.0