riscv: extable: add a dedicated uaccess handler

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Inspired by commit 2e77a62cb3 ("arm64: extable: add a dedicated
uaccess handler"), do similar to riscv to add a dedicated uaccess
exception handler to update registers in exception context and
subsequently return back into the function which faulted, so we remove
the need for fixups specialized to each faulting instruction.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Jisheng Zhang 2021-11-18 19:26:51 +08:00 • committed by Palmer Dabbelt

parent ff4b8cad3a

commit 20802d8d47

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4 changed files with 78 additions and 70 deletions

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23

arch/riscv/include/asm/asm-extable.h

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23

arch/riscv/include/asm/futex.h

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75

arch/riscv/include/asm/uaccess.h

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27

arch/riscv/mm/extable.c

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