Test debugging code with interrupts.

[riscv-tests.git] / debug / programs / interrupt.c

diff --git a/debug/programs/interrupt.c b/debug/programs/interrupt.c
new file mode 100644 (file)
index 0000000..c2dd5ec
--- /dev/null
+++ b/debug/programs/interrupt.c
@@ -0,0 +1,32 @@
+#include "init.h"
+#include "encoding.h"
+
+static volatile unsigned interrupt_count;
+static volatile unsigned local;
+
+static unsigned delta = 0x100;
+void *increment_count(unsigned hartid, unsigned mcause, void *mepc, void *sp)
+{
+    interrupt_count++;
+    // There is no guarantee that the interrupt is cleared immediately when
+    // MTIMECMP is written, so stick around here until that happens.
+    while (csr_read(mip) & MIP_MTIP) {
+        MTIMECMP[hartid] = MTIME + delta;
+    }
+    return mepc;
+}
+
+int main()
+{
+    interrupt_count = 0;
+    local = 0;
+    unsigned hartid = csr_read(mhartid);
+
+    set_trap_handler(increment_count);
+    MTIMECMP[hartid] = MTIME - 1;
+    enable_timer_interrupts();
+
+    while (1) {
+        local++;
+    }
+}