| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #include <linux/linkage.h> |
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| 3 | #include <asm/assembler.h> |
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| 4 | /* |
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| 5 | * Function: v4_early_abort |
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| 6 | * |
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| 7 | * Params : r2 = pt_regs |
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| 8 | * : r4 = aborted context pc |
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| 9 | * : r5 = aborted context psr |
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| 10 | * |
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| 11 | * Returns : r4 - r11, r13 preserved |
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| 12 | * |
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| 13 | * Purpose : obtain information about current aborted instruction. |
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| 14 | * Note: we read user space. This means we might cause a data |
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| 15 | * abort here if the I-TLB and D-TLB aren't seeing the same |
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| 16 | * picture. Unfortunately, this does happen. We live with it. |
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| 17 | */ |
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| 18 | .align 5 |
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| 19 | ENTRY(v4_early_abort) |
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| 20 | mrc p15, 0, r1, c5, c0, 0 @ get FSR |
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| 21 | mrc p15, 0, r0, c6, c0, 0 @ get FAR |
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| 22 | ldr r3, [r4] @ read aborted ARM instruction |
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| 23 | uaccess_disable ip @ disable userspace access |
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| 24 | bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR |
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| 25 | tst r3, #1 << 20 @ L = 1 -> write? |
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| 26 | orreq r1, r1, #1 << 11 @ yes. |
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| 27 | b do_DataAbort |
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| 28 | |
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