File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/arm/mm/abort-ev4t.S b/arch/arm/mm/abort-ev4t.S
new file mode 100644
index 0000000..9da704e
--- /dev/null
+++ b/arch/arm/mm/abort-ev4t.S
@@ -0,0 +1,27 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include "abort-macro.S"
+/*
+ * Function: v4t_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(v4t_early_abort)
+ mrc p15, 0, r1, c5, c0, 0 @ get FSR
+ mrc p15, 0, r0, c6, c0, 0 @ get FAR
+ do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
+ ldreq r3, [r4] @ read aborted ARM instruction
+ bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
+ tst r3, #1 << 20 @ check write
+ orreq r1, r1, #1 << 11
+ b do_DataAbort