[PATCH 5/9] riscv: Add semihosting support

Adapt the arm semihosting support code for RISCV. This implementation is based on the standard for RISC-V semihosting version 0.2 as documented in https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2 Signed-off-by: Keith Packard Message-Id:

[PATCH 5/9] riscv: Add semihosting support

Adapt the arm semihosting support code for RISCV. This implementation is based on the standard for RISC-V semihosting version 0.2 as documented in https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2 Signed-off-by: Keith Packard --- v2: Update PC after exception is