| 1 | #include <linux/linkage.h> |
| 2 | #include <asm/assembler.h> |
| 3 | /* |
| 4 | * Function: v7_early_abort |
| 5 | * |
| 6 | * Params : r2 = pt_regs |
| 7 | * : r4 = aborted context pc |
| 8 | * : r5 = aborted context psr |
| 9 | * |
| 10 | * Returns : r4 - r11, r13 preserved |
| 11 | * |
| 12 | * Purpose : obtain information about current aborted instruction. |
| 13 | */ |
| 14 | .align 5 |
| 15 | ENTRY(v7_early_abort) |
| 16 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
| 17 | mrc p15, 0, r0, c6, c0, 0 @ get FAR |
| 18 | uaccess_disable ip @ disable userspace access |
| 19 | |
| 20 | /* |
| 21 | * V6 code adjusts the returned DFSR. |
| 22 | * New designs should not need to patch up faults. |
| 23 | */ |
| 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 |
| 32 | bne do_DataAbort |
| 33 | |
| 34 | mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR |
| 35 | isb |
| 36 | mrc p15, 0, ip, c7, c4, 0 @ Read the PAR |
| 37 | and r3, ip, #0x7b @ On translation fault |
| 38 | cmp r3, #0x0b |
| 39 | bne do_DataAbort |
| 40 | bic r1, r1, #0xf @ Fix up FSR FS[5:0] |
| 41 | and ip, ip, #0x7e |
| 42 | orr r1, r1, ip, LSR #1 |
| 43 | #endif |
| 44 | |
| 45 | b do_DataAbort |
| 46 | ENDPROC(v7_early_abort) |