threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
48 lines
1.1 KiB
ArmAsm
48 lines
1.1 KiB
ArmAsm
/* 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: v7_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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*/
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.align 5
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ENTRY(v7_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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uaccess_disable ip @ disable userspace access
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/*
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* V6 code adjusts the returned DFSR.
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* New designs should not need to patch up faults.
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*/
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#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
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/*
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* Detect erroneous permission failures and fix
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*/
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ldr r3, =0x40d @ On permission fault
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and r3, r1, r3
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cmp r3, #0x0d
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bne do_DataAbort
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mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
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isb
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mrc p15, 0, ip, c7, c4, 0 @ Read the PAR
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and r3, ip, #0x7b @ On translation fault
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cmp r3, #0x0b
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bne do_DataAbort
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bic r1, r1, #0xf @ Fix up FSR FS[5:0]
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and ip, ip, #0x7e
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orr r1, r1, ip, LSR #1
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#endif
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b do_DataAbort
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ENDPROC(v7_early_abort)
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