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27 lines
871 B
27 lines
871 B
/* 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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/* |
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* Function: v4_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(v4_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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ldr r3, [r4] @ read aborted ARM instruction |
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uaccess_disable ip @ disable userspace access |
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bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR |
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tst r3, #1 << 20 @ L = 1 -> write? |
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orreq r1, r1, #1 << 11 @ yes. |
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b do_DataAbort
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