1#include <linux/linkage.h>
2#include <asm/assembler.h>
3/*
4 * Function: v7_early_abort
5 *
6 * Params  : r2 = pt_regs
7 *	   : r4 = aborted context pc
8 *	   : r5 = aborted context psr
9 *
10 * Returns : r4 - r11, r13 preserved
11 *
12 * Purpose : obtain information about current aborted instruction.
13 */
14	.align	5
15ENTRY(v7_early_abort)
16	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
17	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
18
19	/*
20	 * V6 code adjusts the returned DFSR.
21	 * New designs should not need to patch up faults.
22	 */
23
24#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
25	/*
26	 * Detect erroneous permission failures and fix
27	 */
28	ldr	r3, =0x40d			@ On permission fault
29	and	r3, r1, r3
30	cmp	r3, #0x0d
31	bne	do_DataAbort
32
33	mcr	p15, 0, r0, c7, c8, 0   	@ Retranslate FAR
34	isb
35	mrc	p15, 0, ip, c7, c4, 0   	@ Read the PAR
36	and	r3, ip, #0x7b   		@ On translation fault
37	cmp	r3, #0x0b
38	bne	do_DataAbort
39	bic	r1, r1, #0xf			@ Fix up FSR FS[5:0]
40	and	ip, ip, #0x7e
41	orr	r1, r1, ip, LSR #1
42#endif
43
44	b	do_DataAbort
45ENDPROC(v7_early_abort)
46