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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/linkage.h>
2#include <asm/assembler.h>
3/*
4 * Function: v4_early_abort
5 *
Russell Kingda740472011-06-26 16:01:26 +01006 * Params : r2 = pt_regs
7 * : r4 = aborted context pc
Russell King3e287be2011-06-26 14:35:07 +01008 * : r5 = aborted context psr
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
Russell Kingda740472011-06-26 16:01:26 +010010 * Returns : r4 - r11, r13 preserved
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
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.
16 */
17 .align 5
18ENTRY(v4_early_abort)
19 mrc p15, 0, r1, c5, c0, 0 @ get FSR
20 mrc p15, 0, r0, c6, c0, 0 @ get FAR
Russell King3e287be2011-06-26 14:35:07 +010021 ldr r3, [r4] @ read aborted ARM instruction
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 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.
Russell Kingda740472011-06-26 16:01:26 +010025 b do_DataAbort