target-xtensa: add dc232b core

This is Diamond 232L Standard Core Rev.B (LE), implemented through
linux/gdb overlay.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/target-xtensa/core-dc232b.c b/target-xtensa/core-dc232b.c
new file mode 100644
index 0000000..4d9bd55
--- /dev/null
+++ b/target-xtensa/core-dc232b.c
@@ -0,0 +1,28 @@
+#include "cpu.h"
+#include "exec-all.h"
+#include "gdbstub.h"
+#include "qemu-common.h"
+#include "host-utils.h"
+
+#include "core-dc232b/core-isa.h"
+#include "overlay_tool.h"
+
+static const XtensaConfig dc232b = {
+    .name = "dc232b",
+    .options = XTENSA_OPTIONS,
+    .gdb_regmap = {
+        .num_regs = 120,
+        .num_core_regs = 52,
+        .reg = {
+#include "core-dc232b/gdb-config.c"
+        }
+    },
+    .nareg = XCHAL_NUM_AREGS,
+    .ndepc = 1,
+    EXCEPTIONS_SECTION,
+    INTERRUPTS_SECTION,
+    TLB_SECTION,
+    .clock_freq_khz = 10000,
+};
+
+REGISTER_CORE(dc232b)