Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mm / abort-ev4.S

diff --git a/kernel/arch/arm/mm/abort-ev4.S b/kernel/arch/arm/mm/abort-ev4.S
new file mode 100644 (file)
index 0000000..54473cd
--- /dev/null
+++ b/kernel/arch/arm/mm/abort-ev4.S
@@ -0,0 +1,25 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+/*
+ * Function: v4_early_abort
+ *
+ * Params  : r2 = pt_regs
+ *        : r4 = aborted context pc
+ *        : r5 = aborted context psr
+ *
+ * Returns : r4 - r11, r13 preserved
+ *
+ * Purpose : obtain information about current aborted instruction.
+ * Note: we read user space.  This means we might cause a data
+ * abort here if the I-TLB and D-TLB aren't seeing the same
+ * picture.  Unfortunately, this does happen.  We live with it.
+ */
+       .align  5
+ENTRY(v4_early_abort)
+       mrc     p15, 0, r1, c5, c0, 0           @ get FSR
+       mrc     p15, 0, r0, c6, c0, 0           @ get FAR
+       ldr     r3, [r4]                        @ read aborted ARM instruction
+       bic     r1, r1, #1 << 11 | 1 << 10      @ clear bits 11 and 10 of FSR
+       tst     r3, #1 << 20                    @ L = 1 -> write?
+       orreq   r1, r1, #1 << 11                @ yes.
+       b       do_DataAbort