diff options
Diffstat (limited to 'arch/arm/mm/abort-ev5t.S')
| -rw-r--r-- | arch/arm/mm/abort-ev5t.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev5t.S b/arch/arm/mm/abort-ev5t.S new file mode 100644 index 000000000..98c523118 --- /dev/null +++ b/arch/arm/mm/abort-ev5t.S @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include "abort-macro.S" +/* + * Function: v5t_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(v5t_early_abort) + mrc p15, 0, r1, c5, c0, 0 @ get FSR + mrc p15, 0, r0, c6, c0, 0 @ get FAR + do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 + ldreq r3, [r4] @ read aborted ARM instruction + uaccess_disable ip @ disable user access + bic r1, r1, #1 << 11 @ clear bits 11 of FSR + teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? + beq do_DataAbort @ yes + tst r3, #1 << 20 @ check write + orreq r1, r1, #1 << 11 + b do_DataAbort |