blob: 00ab011bef5848cbcc750d8aa51770cea7ac9934 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/linkage.h>
2#include <asm/assembler.h>
3#include "abort-macro.S"
4/*
5 * Function: v5tj_early_abort
6 *
Russell Kingda740472011-06-26 16:01:26 +01007 * Params : r2 = pt_regs
8 * : r4 = aborted context pc
Russell King3e287be2011-06-26 14:35:07 +01009 * : r5 = aborted context psr
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
Russell Kingda740472011-06-26 16:01:26 +010011 * Returns : r4 - r11, r13 preserved
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 *
13 * Purpose : obtain information about current aborted instruction.
14 * Note: we read user space. This means we might cause a data
15 * abort here if the I-TLB and D-TLB aren't seeing the same
16 * picture. Unfortunately, this does happen. We live with it.
17 */
18 .align 5
19ENTRY(v5tj_early_abort)
20 mrc p15, 0, r1, c5, c0, 0 @ get FSR
21 mrc p15, 0, r0, c6, c0, 0 @ get FAR
22 bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
Russell King3e287be2011-06-26 14:35:07 +010023 tst r5, #PSR_J_BIT @ Java?
Russell Kingda740472011-06-26 16:01:26 +010024 bne do_DataAbort
Russell King3e287be2011-06-26 14:35:07 +010025 do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
26 ldreq r3, [r4] @ read aborted ARM instruction
Russell King2190fed2015-08-20 10:32:02 +010027 uaccess_disable ip @ disable userspace access
Russell King08446b12015-08-25 14:59:15 +010028 teq_ldrd tmp=ip, insn=r3 @ insn was LDRD?
29 beq do_DataAbort @ yes
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 tst r3, #1 << 20 @ L = 0 -> write
31 orreq r1, r1, #1 << 11 @ yes.
Russell Kingda740472011-06-26 16:01:26 +010032 b do_DataAbort