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4e93cb00 MG |
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 | */ | |
0c549ba1 MG |
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 | ||
4e93cb00 MG |
53 | mov pc, lr |
54 | ENDPROC(v7_early_abort) |