'sp' is the 'stack pointer' register. There's an explanation of the stack later in the guide: https://dramforever.github.io/easyriscv/#the-stack https://dramfor

'sp' is the 'stack pointer' register. There's an explanation of the stack later in the guide: https://dramforever.github.io/easyriscv/#the-stack https://dramforever.github.io/easyriscv/#the-stack