riscv: add support for misaligned trap handling in S-mode

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Misalignment trap handling is only supported for M-mode and uses direct
accesses to user memory. In S-mode, when handling usermode fault, this
requires to use the get_user()/put_user() accessors. Implement
load_u8(), store_u8() and get_insn() using these accessors for
userspace and direct text access for kernel.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20231004151405.521596-3-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Clément Léger 2023-10-04 17:13:59 +02:00 • committed by Palmer Dabbelt

parent f19c3b4239

commit 7c83232161

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5 changed files with 129 additions and 23 deletions

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8

arch/riscv/Kconfig

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14

arch/riscv/include/asm/entry-common.h

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2

arch/riscv/kernel/Makefile

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9

arch/riscv/kernel/traps.c

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119

arch/riscv/kernel/traps_misaligned.c

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