[PATCH v12 2/3] xen/riscv: test basic exception handling stuff

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Introduces testing of some macros from <xen/bug.h>.

Also wraps this testing into SELF_TESTS config to not produce
a noise in the log related to functionality testing ( in the
current case, it is macros from xen/bug.h ) when CONFIG_SELF_TESTS
is disabled.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
Acked-by: Alistair Francis <alistair.francis@xxxxxxx>
---
Changes in V12:
 - Notrhing changed. Only rebase.
---
Changes in V11:
 - update the commit message.
---
Changes in V10:
 - wrap test_macros_from_bug_h() under "#ifdef CONFIG_SELF_TESTS"
 - update the commit title to: "xen/riscv: test basic exception handling stuff"
---
Changes in V9:
  - s/early_printk/printk as common code is now available
---
Changes in V5-V8:
  - Nothing changed. Only rebase.
---
Changes in V4:
  - Add Acked-by: Alistair Francis <alistair.francis@xxxxxxx>
---
Changes in V2-V3:
  - Nothing changed
---
 xen/arch/riscv/setup.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/xen/arch/riscv/setup.c b/xen/arch/riscv/setup.c
index a6a29a1508..4defad68f4 100644
--- a/xen/arch/riscv/setup.c
+++ b/xen/arch/riscv/setup.c
@@ -19,6 +19,22 @@ void arch_get_xen_caps(xen_capabilities_info_t *info)
 unsigned char __initdata cpu0_boot_stack[STACK_SIZE]
     __aligned(STACK_SIZE);
 
+#ifdef CONFIG_SELF_TESTS
+static void test_run_in_exception(const struct cpu_user_regs *regs)
+{
+    printk("If you see this message, ");
+    printk("run_in_exception_handler is most likely working\n");
+}
+
+static void test_macros_from_bug_h(void)
+{
+    run_in_exception_handler(test_run_in_exception);
+    WARN();
+    printk("If you see this message, ");
+    printk("WARN is most likely working\n");
+}
+#endif
+
 void __init noreturn start_xen(unsigned long bootcpu_id,
                                paddr_t dtb_addr)
 {
@@ -26,6 +42,10 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
 
     trap_init();
 
+#ifdef CONFIG_SELF_TESTS
+    test_macros_from_bug_h();
+#endif
+
     printk("All set up\n");
 
     for ( ;; )
-- 
2.45.2