projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| bbe88886 CM |
2 | #include <linux/linkage.h> |
| 3 | #include <asm/assembler.h> | |
| 4 | /* | |
| 5 | * Function: v7_early_abort | |
| 6 | * | |
| da740472 RK |
7 | * Params : r2 = pt_regs |
| 8 | * : r4 = aborted context pc | |
| 3e287bec | 9 | * : r5 = aborted context psr |
| bbe88886 | 10 | * |
| da740472 | 11 | * Returns : r4 - r11, r13 preserved |
| bbe88886 CM |
12 | * |
| 13 | * Purpose : obtain information about current aborted instruction. | |
| 14 | */ | |
| 15 | .align 5 | |
| 16 | ENTRY(v7_early_abort) | |
| bbe88886 CM |
17 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
| 18 | mrc p15, 0, r0, c6, c0, 0 @ get FAR | |
| 2190fed6 | 19 | uaccess_disable ip @ disable userspace access |
| bbe88886 CM |
20 | |
| 21 | /* | |
| 22 | * V6 code adjusts the returned DFSR. | |
| 23 | * New designs should not need to patch up faults. | |
| 24 | */ | |
| e220ba60 DE |
25 | |
| 26 | #if defined(CONFIG_VERIFY_PERMISSION_FAULT) | |
| 27 | /* | |
| 28 | * Detect erroneous permission failures and fix | |
| 29 | */ | |
| 30 | ldr r3, =0x40d @ On permission fault | |
| 31 | and r3, r1, r3 | |
| 32 | cmp r3, #0x0d | |
| da740472 | 33 | bne do_DataAbort |
| e220ba60 DE |
34 | |
| 35 | mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR | |
| 36 | isb | |
| 0d147db0 RK |
37 | mrc p15, 0, ip, c7, c4, 0 @ Read the PAR |
| 38 | and r3, ip, #0x7b @ On translation fault | |
| e220ba60 | 39 | cmp r3, #0x0b |
| da740472 | 40 | bne do_DataAbort |
| e220ba60 | 41 | bic r1, r1, #0xf @ Fix up FSR FS[5:0] |
| 0d147db0 RK |
42 | and ip, ip, #0x7e |
| 43 | orr r1, r1, ip, LSR #1 | |
| e220ba60 DE |
44 | #endif |
| 45 | ||
| da740472 | 46 | b do_DataAbort |
| 93ed3970 | 47 | ENDPROC(v7_early_abort) |