[ARM] nommu: abort handler fixup for !CPU_CP15_MMU cores.

There is no FSR/FAR register on no-CP15 or MPU cores. This patch adds a
dummy abort handler which returns zero for the base restored Data Abort
model !CPU_CP15_MMU cores. The abort-lv4t.S is still used with the fix-up
for the base updated Data Abort model cores.

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/arm/mm/abort-nommu.S b/arch/arm/mm/abort-nommu.S
new file mode 100644
index 000000000000..a7cc7f9ee45d
--- /dev/null
+++ b/arch/arm/mm/abort-nommu.S
@@ -0,0 +1,19 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+/*
+ * Function: nommu_early_abort
+ *
+ * Params  : r2 = address of aborted instruction
+ *         : r3 = saved SPSR
+ *
+ * Returns : r0 = 0 (abort address)
+ *         : r1 = 0 (FSR)
+ *
+ * Note: There is no FSR/FAR on !CPU_CP15_MMU cores.
+ *       Just fill zero into the registers.
+ */
+        .align  5
+ENTRY(nommu_early_abort)
+        mov     r0, #0                          @ clear r0, r1 (no FSR/FAR)
+        mov     r1, #0
+        mov     pc, lr