diff options
Diffstat (limited to 'arch/arm/mm/abort-ev6.S')
| -rw-r--r-- | arch/arm/mm/abort-ev6.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev6.S b/arch/arm/mm/abort-ev6.S new file mode 100644 index 000000000..c58bf8b43 --- /dev/null +++ b/arch/arm/mm/abort-ev6.S @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include "abort-macro.S" +/* + * Function: v6_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(v6_early_abort) + mrc p15, 0, r1, c5, c0, 0 @ get FSR + mrc p15, 0, r0, c6, c0, 0 @ get FAR +/* + * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. + */ +#ifdef CONFIG_ARM_ERRATA_326103 + ldr ip, =0x4107b36 + mrc p15, 0, r3, c0, c0, 0 @ get processor id + teq ip, r3, lsr #4 @ r0 ARM1136? + bne 1f + tst r5, #PSR_J_BIT @ Java? + tsteq r5, #PSR_T_BIT @ Thumb? + bne 1f + bic r1, r1, #1 << 11 @ clear bit 11 of FSR + ldr r3, [r4] @ read aborted ARM instruction + ARM_BE8(rev r3, r3) + + teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? + beq 1f @ yes + tst r3, #1 << 20 @ L = 0 -> write + orreq r1, r1, #1 << 11 @ yes. +#endif +1: uaccess_disable ip @ disable userspace access + b do_DataAbort |