ARM: Allow to mask data aborts

Sometimes it's useful to test if a memory operation works or
aborts. This adds data_abort_mask() to ignore data aborts and
data_abort_unmask() to enable them again. This is used in the
next step for the 'md' command so that illegal addresses just
show 'xxxxxxxx' instead of crashing the system.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/abort.h b/include/abort.h
new file mode 100644
index 0000000000..7f14cb0bb5
--- /dev/null
+++ b/include/abort.h
@@ -0,0 +1,37 @@
+#ifndef __ABORT_H
+#define __ABORT_H
+
+#include <asm/barebox.h>
+
+#ifdef ARCH_HAS_DATA_ABORT_MASK
+
+/*
+ * data_abort_mask - ignore data aborts
+ *
+ * If data aborts are ignored the data abort handler
+ * will just return.
+ */
+void data_abort_mask(void);
+
+/*
+ * data_abort_unmask - Enable data aborts
+ *
+ * returns true if a data abort has happened between calling data_abort_mask()
+ * and data_abort_unmask()
+ */
+int data_abort_unmask(void);
+
+#else
+
+static inline void data_abort_mask(void)
+{
+}
+
+static inline int data_abort_unmask(void)
+{
+	return 0;
+}
+
+#endif
+
+#endif /* __ABORT_H */