forked from Mirrors/opensbi
a6395acd6c
The unpriv load/store instruction from M-mode can cause page/access fault to M-mode if S-mode page table did not have mappings OR it did not have PMP access permission. To tackle this, we redirect trap back to S-mode if unpriv load/store instruction traps in M-mode. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
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 __RISCV_UNPRIV_H__
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#define __RISCV_UNPRIV_H__
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#include <sbi/sbi_types.h>
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struct sbi_scratch;
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struct unpriv_trap {
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unsigned long ilen;
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unsigned long cause;
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unsigned long tval;
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};
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#define DECLARE_UNPRIVILEGED_LOAD_FUNCTION(type) \
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type load_##type(const type *addr, \
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struct sbi_scratch *scratch, \
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struct unpriv_trap *trap);
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#define DECLARE_UNPRIVILEGED_STORE_FUNCTION(type) \
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void store_##type(type *addr, type val, \
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struct sbi_scratch *scratch, \
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struct unpriv_trap *trap);
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u8)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u16)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s8)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s16)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s32)
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DECLARE_UNPRIVILEGED_STORE_FUNCTION(u8)
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DECLARE_UNPRIVILEGED_STORE_FUNCTION(u16)
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DECLARE_UNPRIVILEGED_STORE_FUNCTION(u32)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u32)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u64)
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DECLARE_UNPRIVILEGED_STORE_FUNCTION(u64)
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DECLARE_UNPRIVILEGED_LOAD_FUNCTION(ulong)
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ulong get_insn(ulong mepc, ulong *mstatus);
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#endif
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