Diffstat (limited to 'arch/arm/mm/abort-ev4.S')
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev4.S b/arch/arm/mm/abort-ev4.S
new file mode 100644
@@ -0,0 +1,30 @@
+ * Function: v4_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
+ mrc p15, 0, r1, c5, c0, 0 @ get FSR
+ mrc p15, 0, r0, c6, c0, 0 @ get FAR
+ ldr r3, [r2] @ 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.
+ mov pc, lr