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-rw-r--r--arch/arm/mm/abort-ev5t.S31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev5t.S b/arch/arm/mm/abort-ev5t.S
new file mode 100644
index 000000000000..02251b526c0d
--- /dev/null
+++ b/arch/arm/mm/abort-ev5t.S
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+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include "abort-macro.S"
+/*
+ * Function: v5t_early_abort
+ *
+ * Params : r2 = address of aborted instruction
+ * : r3 = saved SPSR
+ *
+ * Returns : r0 = address of abort
+ * : r1 = FSR, bit 11 = write
+ * : r2-r8 = corrupted
+ * : r9 = preserved
+ * : sp = pointer to registers
+ *
+ * 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(v5t_early_abort)
+ mrc p15, 0, r1, c5, c0, 0 @ get FSR
+ mrc p15, 0, r0, c6, c0, 0 @ get FAR
+ do_thumb_abort
+ ldreq r3, [r2] @ read aborted ARM instruction
+ bic r1, r1, #1 << 11 @ clear bits 11 of FSR
+ do_ldrd_abort
+ tst r3, #1 << 20 @ check write
+ orreq r1, r1, #1 << 11
+ mov pc, lr