forked from Mirrors/opensbi
4c112650bb
This patch abstracts out the instruction decoding part of misaligned ld/st
fault handlers, so it can be reused by ld/st access fault handlers.
Also Added lb/lbu/sb decoding. (previously unreachable by misaligned fault)
sbi_trap_emulate_load/store is now the common handler which takes a `emu`
parameter that is responsible for emulating the misaligned or access fault.
The `emu` callback is expected to fixup the fault, and based on the return
code of `emu`, sbi_trap_emulate_load/store will:
r/wlen => the fixup is successful and regs/mepc needs to be updated.
0 => the fixup is successful, but regs/mepc should be left untouched
(this is usually used if `emu` does `sbi_trap_redirect`)
-err => failed, sbi_trap_error will be called
For now, load/store access faults are blindly redirected. It will be
enhanced in the following patches.
Signed-off-by: Bo Gan <ganboing@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
36 lines
807 B
C
36 lines
807 B
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __SBI_TRAP_LDST_H__
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#define __SBI_TRAP_LDST_H__
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_trap.h>
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union sbi_ldst_data {
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u64 data_u64;
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u32 data_u32;
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u8 data_bytes[8];
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ulong data_ulong;
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};
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int sbi_misaligned_load_handler(struct sbi_trap_regs *regs,
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const struct sbi_trap_info *orig_trap);
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int sbi_misaligned_store_handler(struct sbi_trap_regs *regs,
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const struct sbi_trap_info *orig_trap);
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int sbi_load_access_handler(struct sbi_trap_regs *regs,
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const struct sbi_trap_info *orig_trap);
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int sbi_store_access_handler(struct sbi_trap_regs *regs,
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const struct sbi_trap_info *orig_trap);
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#endif
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