diff options
Diffstat (limited to 'arch/arm/mm/abort-ev7.S')
| -rw-r--r-- | arch/arm/mm/abort-ev7.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/arm/mm/abort-ev7.S b/arch/arm/mm/abort-ev7.S new file mode 100644 index 000000000..f7cc5d684 --- /dev/null +++ b/arch/arm/mm/abort-ev7.S @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/linkage.h> +#include <asm/assembler.h> +/* + * Function: v7_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. + */ + .align 5 +ENTRY(v7_early_abort) + mrc p15, 0, r1, c5, c0, 0 @ get FSR + mrc p15, 0, r0, c6, c0, 0 @ get FAR + uaccess_disable ip @ disable userspace access + + /* + * V6 code adjusts the returned DFSR. + * New designs should not need to patch up faults. + */ + +#if defined(CONFIG_VERIFY_PERMISSION_FAULT) + /* + * Detect erroneous permission failures and fix + */ + ldr r3, =0x40d @ On permission fault + and r3, r1, r3 + cmp r3, #0x0d + bne do_DataAbort + + mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR + isb + mrc p15, 0, ip, c7, c4, 0 @ Read the PAR + and r3, ip, #0x7b @ On translation fault + cmp r3, #0x0b + bne do_DataAbort + bic r1, r1, #0xf @ Fix up FSR FS[5:0] + and ip, ip, #0x7e + orr r1, r1, ip, LSR #1 +#endif + + b do_DataAbort +ENDPROC(v7_early_abort) |