bsd-user: Add RISC-V signal trampoline setup function

Implemented the 'setup_sigtramp' function for setting up the signal
trampoline code in the RISC-V architecture.

Signed-off-by: Mark Corbin <mar

bsd-user: Add RISC-V signal trampoline setup function

Implemented the 'setup_sigtramp' function for setting up the signal
trampoline code in the RISC-V architecture.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240916155119.14610-8-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

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