riscv-doc.md

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RISC-V IM 32 bits for EGG

The RISC-V implementation for EGG uses the standard Assembly syntax described in the README. It implements the registers and instructions from the base integer set and the multiplication extension described in this document.

Environment call numbers are placed in the a7 register, and arguments are placed in a0 and a1.

An ebreak instruction will perform a BREAK call.

Example program (writes "Hello, World!", breaks a line and exits):

	addi a7, zero, 3
	addi a0, zero, msg
	addi a1, zero, 14
	ecall
	ebreak

msg:
#Hello, World!%0a

The assembled program is loaded at the address 0 on the machine startup, and the pc register is set to 0. The stack pointer register is not initialized: the program should initialize it if it wants to use the stack.