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core: riscv: Improve the trap handler #6819

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core: riscv: Improve the trap handler #6819

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Commits on May 24, 2024

  1. core: riscv: Improve the trap handler 

    In current RISC-V trap handler, we always save the context into struct
thread_trap_regs first, and copy the saved context into another specific
structure to handle that trap. For example, thread_user_ecall_handler()
copies the struct thread_trap_regs to be struct thread_scall_regs before
handling this system call. In fact, such copies may drop the performance
and they should be eliminated.

In this commit, the specific data structure used to save the context is
determined early in the trap handler by checking the type of the trap
from CSR XCAUSE. Thus, the copies between context structures are
eliminated.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Tested-by: Yu Chien Peter Lin <peterlin@andestech.com>
    @gagachang
    gagachang committed May 24, 2024
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