1 #include <linux/linkage.h>
2 #include <asm/assembler.h>
4 * Function: v4_early_abort
6 * Params : r2 = pt_regs
7 * : r4 = aborted context pc
8 * : r5 = aborted context psr
10 * Returns : r4 - r11, r13 preserved
12 * Purpose : obtain information about current aborted instruction.
13 * Note: we read user space. This means we might cause a data
14 * abort here if the I-TLB and D-TLB aren't seeing the same
15 * picture. Unfortunately, this does happen. We live with it.
19 mrc p15, 0, r1, c5, c0, 0 @ get FSR
20 mrc p15, 0, r0, c6, c0, 0 @ get FAR
21 ldr r3, [r4] @ read aborted ARM instruction
22 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
23 tst r3, #1 << 20 @ L = 1 -> write?
24 orreq r1, r1, #1 << 11 @ yes.