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1da177e4 LT |
1 | #include <linux/linkage.h> |
2 | #include <asm/assembler.h> | |
3 | /* | |
4 | * Function: v4_early_abort | |
5 | * | |
3e287bec RK |
6 | * Params : r4 = aborted context pc |
7 | * : r5 = aborted context psr | |
1da177e4 LT |
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 | * Note: we read user space. This means we might cause a data | |
17 | * abort here if the I-TLB and D-TLB aren't seeing the same | |
18 | * picture. Unfortunately, this does happen. We live with it. | |
19 | */ | |
20 | .align 5 | |
21 | ENTRY(v4_early_abort) | |
22 | mrc p15, 0, r1, c5, c0, 0 @ get FSR | |
23 | mrc p15, 0, r0, c6, c0, 0 @ get FAR | |
3e287bec | 24 | ldr r3, [r4] @ read aborted ARM instruction |
1da177e4 LT |
25 | bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR |
26 | tst r3, #1 << 20 @ L = 1 -> write? | |
27 | orreq r1, r1, #1 << 11 @ yes. | |
28 | mov pc, lr |