| #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) |
| #ifdef CONFIG_CPU_V6 |
| sub r1, sp, #4 @ Get unused stack location |
| strex r0, r1, [r1] @ Clear the exclusive monitor |
| #elif defined(CONFIG_CPU_32v6K) |
| clrex |
| #endif |
| 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 (erratum 326103). |
| * The test below covers all the write situations, including Java bytecodes |
| */ |
| bic r1, r1, #1 << 11 @ clear bit 11 of FSR |
| tst r5, #PSR_J_BIT @ Java? |
| bne do_DataAbort |
| do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3 |
| ldreq r3, [r4] @ read aborted ARM instruction |
| #ifdef CONFIG_CPU_ENDIAN_BE8 |
| reveq r3, r3 |
| #endif |
| do_ldrd_abort tmp=ip, insn=r3 |
| tst r3, #1 << 20 @ L = 0 -> write |
| orreq r1, r1, #1 << 11 @ yes. |
| b do_DataAbort |
