| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/linkage.h> |
| 2 | #include <asm/assembler.h> |
| 3 | /* |
| 4 | * Function: v4_early_abort |
| 5 | * |
| Russell King | da74047 | 2011-06-26 16:01:26 +0100 | [diff] [blame] | 6 | * Params : r2 = pt_regs |
| 7 | * : r4 = aborted context pc |
| Russell King | 3e287be | 2011-06-26 14:35:07 +0100 | [diff] [blame] | 8 | * : r5 = aborted context psr |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| Russell King | da74047 | 2011-06-26 16:01:26 +0100 | [diff] [blame] | 10 | * Returns : r4 - r11, r13 preserved |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Purpose : obtain information about current aborted instruction. |
| 13 | * Note: we read user space. This means we might cause a data |
| 14 | * abort here if the I-TLB and D-TLB aren't seeing the same |
| 15 | * picture. Unfortunately, this does happen. We live with it. |
| 16 | */ |
| 17 | .align 5 |
| 18 | ENTRY(v4_early_abort) |
| 19 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
| 20 | mrc p15, 0, r0, c6, c0, 0 @ get FAR |
| Russell King | 3e287be | 2011-06-26 14:35:07 +0100 | [diff] [blame] | 21 | ldr r3, [r4] @ read aborted ARM instruction |
| Russell King | 2190fed | 2015-08-20 10:32:02 +0100 | [diff] [blame] | 22 | uaccess_disable ip @ disable userspace access |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR |
| 24 | tst r3, #1 << 20 @ L = 1 -> write? |
| 25 | orreq r1, r1, #1 << 11 @ yes. |
| Russell King | da74047 | 2011-06-26 16:01:26 +0100 | [diff] [blame] | 26 | b do_DataAbort |