| Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 1 | #include <linux/linkage.h> |
| 2 | #include <asm/assembler.h> |
| 3 | /* |
| 4 | * Function: v7_early_abort |
| 5 | * |
| 6 | * Params : r2 = address of aborted instruction |
| 7 | * : r3 = saved SPSR |
| 8 | * |
| 9 | * Returns : r0 = address of abort |
| 10 | * : r1 = FSR, bit 11 = write |
| 11 | * : r2-r8 = corrupted |
| 12 | * : r9 = preserved |
| 13 | * : sp = pointer to registers |
| 14 | * |
| 15 | * Purpose : obtain information about current aborted instruction. |
| 16 | */ |
| 17 | .align 5 |
| 18 | ENTRY(v7_early_abort) |
| 19 | /* |
| 20 | * The effect of data aborts on on the exclusive access monitor are |
| 21 | * UNPREDICTABLE. Do a CLREX to clear the state |
| 22 | */ |
| 23 | clrex |
| 24 | |
| 25 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
| 26 | mrc p15, 0, r0, c6, c0, 0 @ get FAR |
| 27 | |
| 28 | /* |
| 29 | * V6 code adjusts the returned DFSR. |
| 30 | * New designs should not need to patch up faults. |
| 31 | */ |
| Dave Estes | e220ba6 | 2009-08-11 17:58:49 -0400 | [diff] [blame] | 32 | |
| 33 | #if defined(CONFIG_VERIFY_PERMISSION_FAULT) |
| 34 | /* |
| 35 | * Detect erroneous permission failures and fix |
| 36 | */ |
| 37 | ldr r3, =0x40d @ On permission fault |
| 38 | and r3, r1, r3 |
| 39 | cmp r3, #0x0d |
| 40 | movne pc, lr |
| 41 | |
| 42 | mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR |
| 43 | isb |
| 44 | mrc p15, 0, r2, c7, c4, 0 @ Read the PAR |
| 45 | and r3, r2, #0x7b @ On translation fault |
| 46 | cmp r3, #0x0b |
| 47 | movne pc, lr |
| 48 | bic r1, r1, #0xf @ Fix up FSR FS[5:0] |
| 49 | and r2, r2, #0x7e |
| 50 | orr r1, r1, r2, LSR #1 |
| 51 | #endif |
| 52 | |
| Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 53 | mov pc, lr |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 54 | ENDPROC(v7_early_abort) |