1 files changed, 136 insertions, 0 deletions
diff --git a/core/cortex-m0/vecttable.c b/core/cortex-m0/vecttable.c
new file mode 100644
index 0000000000..a4b5c8831d
--- /dev/null
+++ b/core/cortex-m0/vecttable.c
@@ -0,0 +1,136 @@
+/* Copyright (c) 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Cortex-M CPU vector table
+ */
+
+#ifndef ___INIT
+#define ___INIT
+#include <stddef.h>
+#include <stdint.h>
+
+#include "config.h"
+#include "panic-internal.h"
+#include "task.h"
+#endif  /* __INIT */
+
+typedef void (*func)(void);
+
+#ifndef PASS
+#define PASS 1
+#endif
+
+#if PASS == 1
+
+void __attribute__((naked)) default_handler(void)
+{
+	/*
+	 * An (enforced) long tail call to preserve exn_return in lr without
+	 * restricting the relative placement of default_handler and
+	 * exception_panic.
+	 */
+	asm volatile("bx %0\n" : : "r" (exception_panic));
+}
+
+#define table(x) x
+
+/* Note: the alias target must be defined in this translation unit */
+#define weak_with_default __attribute__((used, weak, alias("default_handler")))
+
+#define vec(name) extern void weak_with_default name ## _handler(void);
+#define irq(num) vec(irq_ ## num)
+
+#define item(name) extern void name(void);
+#define null
+
+extern void stack_end(void); /* not technically correct, it's just a pointer */
+extern void reset(void);
+
+#pragma GCC diagnostic push
+#if __GNUC__ >= 8
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+#endif
+#pragma GCC diagnostic pop
+
+#endif /* PASS 1 */
+
+#if PASS == 2
+#undef table
+#undef vec
+#undef irq
+#undef item
+#undef null
+
+/* number of elements before the first irq vector */
+#define IRQ_OFFSET 16
+/* element in the table that is null: extra IRQs are routed there,
+ * then finally overwritten
+ */
+#define IRQ_UNUSED_OFFSET 8
+
+#define table(x) func vectors[] __attribute__((section(".text.vecttable,\"a\" @"))) = { x[IRQ_UNUSED_OFFSET] = null };
+
+#define vec(name) name ## _handler,
+#define irq(num) [num < CONFIG_IRQ_COUNT ? num + IRQ_OFFSET : IRQ_UNUSED_OFFSET] = vec(irq_ ## num)
+
+#define item(name) name,
+#define null (void *)0,
+#endif /* PASS 2 */
+
+table(
+	item(stack_end)
+	item(reset)
+	vec(nmi)
+	vec(hard_fault)
+	vec(mpu_fault)
+	vec(bus_fault)
+	vec(usage_fault)
+	null
+	null
+	null
+	null
+	vec(svc)
+	vec(debug)
+	null
+	vec(pendsv)
+	vec(sys_tick)
+	irq(0)
+	irq(1)
+	irq(2)
+	irq(3)
+	irq(4)
+	irq(5)
+	irq(6)
+	irq(7)
+	irq(8)
+	irq(9)
+	irq(10)
+	irq(11)
+	irq(12)
+	irq(13)
+	irq(14)
+	irq(15)
+	irq(16)
+	irq(17)
+	irq(18)
+	irq(19)
+	irq(20)
+	irq(21)
+	irq(22)
+	irq(23)
+	irq(24)
+	irq(25)
+	irq(26)
+	irq(27)
+	irq(28)
+	irq(29)
+	irq(30)
+	irq(31)
+)
+
+#if PASS == 1
+#undef PASS
+#define PASS 2
+#include "vecttable.c"
+#endif