diff options
Diffstat (limited to 'arch/arm/mm/abort-ev4.S')
| -rw-r--r-- | arch/arm/mm/abort-ev4.S | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev4.S b/arch/arm/mm/abort-ev4.S new file mode 100644 index 0000000000..a10bcb8959 --- /dev/null +++ b/arch/arm/mm/abort-ev4.S @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/assembler.h> +/* + * Function: v4_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(v4_early_abort) + mrc p15, 0, r1, c5, c0, 0 @ get FSR + mrc p15, 0, r0, c6, c0, 0 @ get FAR + ldr r3, [r4] @ read aborted ARM instruction + uaccess_disable ip @ disable userspace access + bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR + tst r3, #1 << 20 @ L = 1 -> write? + orreq r1, r1, #1 << 11 @ yes. + b do_DataAbort |