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- #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
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