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- #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
- uaccess_disable ip @ disable userspace access
- 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
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