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