diff options
Diffstat (limited to 'kernel/arch/arm/mm/abort-ev6.S')
| -rw-r--r-- | kernel/arch/arm/mm/abort-ev6.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/kernel/arch/arm/mm/abort-ev6.S b/kernel/arch/arm/mm/abort-ev6.S new file mode 100644 index 000000000..8c48c5c22 --- /dev/null +++ b/kernel/arch/arm/mm/abort-ev6.S @@ -0,0 +1,41 @@ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include "abort-macro.S" +/* + * Function: v6_early_abort + * + * Params : r2 = pt_regs + * : r4 = aborted context pc + * : r5 = aborted context psr + * + * Returns : r4 - r11, r13 preserved + * + * Purpose : obtain information about current aborted instruction. + * Note: we read user space. This means we might cause a data + * abort here if the I-TLB and D-TLB aren't seeing the same + * picture. Unfortunately, this does happen. We live with it. + */ + .align 5 +ENTRY(v6_early_abort) + mrc p15, 0, r1, c5, c0, 0 @ get FSR + mrc p15, 0, r0, c6, c0, 0 @ get FAR +/* + * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. + */ +#ifdef CONFIG_ARM_ERRATA_326103 + ldr ip, =0x4107b36 + mrc p15, 0, r3, c0, c0, 0 @ get processor id + teq ip, r3, lsr #4 @ r0 ARM1136? + bne do_DataAbort + tst r5, #PSR_J_BIT @ Java? + tsteq r5, #PSR_T_BIT @ Thumb? + bne do_DataAbort + bic r1, r1, #1 << 11 @ clear bit 11 of FSR + ldr r3, [r4] @ read aborted ARM instruction + ARM_BE8(rev r3, r3) + + do_ldrd_abort tmp=ip, insn=r3 + tst r3, #1 << 20 @ L = 0 -> write + orreq r1, r1, #1 << 11 @ yes. +#endif + b do_DataAbort |