riscv: add support for PR_SET_UNALIGN and PR_GET_UNALIGN

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Now that trap support is ready to handle misalignment errors in S-mode,
allow the user to control the behavior of misaligned accesses using
prctl(PR_SET_UNALIGN). Add an align_ctl flag in thread_struct which
will be used to determine if we should SIGBUS the process or not on
such fault.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20231004151405.521596-9-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Clément Léger 2023-10-04 17:14:05 +02:00 • committed by Palmer Dabbelt

parent 71c54b3d16

commit 9f23a5d2f6

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9

arch/riscv/include/asm/processor.h

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18

arch/riscv/kernel/process.c

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6

arch/riscv/kernel/traps_misaligned.c

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