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44 lines
1.2 KiB
44 lines
1.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include "abort-macro.S" |
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/* |
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* Function: v6_early_abort |
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* |
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* Params : r2 = pt_regs |
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* : r4 = aborted context pc |
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* : r5 = aborted context psr |
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* |
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* Returns : r4 - r11, r13 preserved |
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* |
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* Purpose : obtain information about current aborted instruction. |
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* Note: we read user space. This means we might cause a data |
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* abort here if the I-TLB and D-TLB aren't seeing the same |
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* picture. Unfortunately, this does happen. We live with it. |
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*/ |
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.align 5 |
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ENTRY(v6_early_abort) |
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mrc p15, 0, r1, c5, c0, 0 @ get FSR |
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mrc p15, 0, r0, c6, c0, 0 @ get FAR |
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/* |
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* Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR. |
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*/ |
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#ifdef CONFIG_ARM_ERRATA_326103 |
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ldr ip, =0x4107b36 |
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mrc p15, 0, r3, c0, c0, 0 @ get processor id |
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teq ip, r3, lsr #4 @ r0 ARM1136? |
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bne 1f |
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tst r5, #PSR_J_BIT @ Java? |
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tsteq r5, #PSR_T_BIT @ Thumb? |
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bne 1f |
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bic r1, r1, #1 << 11 @ clear bit 11 of FSR |
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ldr r3, [r4] @ read aborted ARM instruction |
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ARM_BE8(rev r3, r3) |
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teq_ldrd tmp=ip, insn=r3 @ insn was LDRD? |
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beq 1f @ yes |
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tst r3, #1 << 20 @ L = 0 -> write |
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orreq r1, r1, #1 << 11 @ yes. |
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#endif |
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1: uaccess_disable ip @ disable userspace access |
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b do_DataAbort
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