Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #include <linux/linkage.h> |
2 | #include <asm/assembler.h> | |
3a1e5015 | 3 | #include "abort-macro.S" |
1da177e4 LT |
4 | /* |
5 | * Function: v6_early_abort | |
6 | * | |
7 | * Params : r2 = address of aborted instruction | |
8 | * : r3 = saved SPSR | |
9 | * | |
10 | * Returns : r0 = address of abort | |
11 | * : r1 = FSR, bit 11 = write | |
12 | * : r2-r8 = corrupted | |
13 | * : r9 = preserved | |
14 | * : sp = pointer to registers | |
15 | * | |
16 | * Purpose : obtain information about current aborted instruction. | |
3a1e5015 GD |
17 | * Note: we read user space. This means we might cause a data |
18 | * abort here if the I-TLB and D-TLB aren't seeing the same | |
19 | * picture. Unfortunately, this does happen. We live with it. | |
1da177e4 LT |
20 | */ |
21 | .align 5 | |
22 | ENTRY(v6_early_abort) | |
7db44c75 | 23 | #ifdef CONFIG_CPU_V6 |
25ef4a67 SF |
24 | sub r1, sp, #4 @ Get unused stack location |
25 | strex r0, r1, [r1] @ Clear the exclusive monitor | |
7db44c75 RK |
26 | #elif defined(CONFIG_CPU_32v6K) |
27 | clrex | |
2c3a0540 | 28 | #endif |
1da177e4 LT |
29 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
30 | mrc p15, 0, r0, c6, c0, 0 @ get FAR | |
3a1e5015 | 31 | /* |
fe68e68f | 32 | * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR (erratum 326103). |
3a1e5015 GD |
33 | * The test below covers all the write situations, including Java bytecodes |
34 | */ | |
fe68e68f | 35 | bic r1, r1, #1 << 11 @ clear bit 11 of FSR |
3a1e5015 GD |
36 | tst r3, #PSR_J_BIT @ Java? |
37 | movne pc, lr | |
be020f86 | 38 | do_thumb_abort fsr=r1, pc=r2, psr=r3, tmp=r3 |
3a1e5015 | 39 | ldreq r3, [r2] @ read aborted ARM instruction |
26584853 CM |
40 | #ifdef CONFIG_CPU_ENDIAN_BE8 |
41 | reveq r3, r3 | |
42 | #endif | |
be020f86 | 43 | do_ldrd_abort tmp=r2, insn=r3 |
3a1e5015 GD |
44 | tst r3, #1 << 20 @ L = 0 -> write |
45 | orreq r1, r1, #1 << 11 @ yes. | |
1da177e4 LT |
46 | mov pc, lr |
47 | ||
48 |