dknelson9876 / cr16assembler

CR16 Assembler

Usage

1. Consult all 'FILL ME IN' comments

This includes RAM_START, FILE_LENGTH, INST_SETS, reg_codes, inst_codes

CR16 Syntax

These are all pulled from/based on the full CR16 Programmer's Reference Manual, with some syntax additions to help reduce mistakes

• Instruction names are lowercased, but the assembler accepts uppercase

  add r0, r3

• Registers are prefixed by R or r and are labeled r0-r13, rA, rSP

  r0, r1, ...

• Labels are prefixed with a . (period), and must be the only thing on that line
• Indentation is ignored by the assembler
• Immediate values are prefixed with a $, and can be in decimal or hexadecimal

  $10, $127, $0x20, $0x100

CR16 Assembler

Register Uses

reg	use
%r0	reserved hardware 0
%r1	callee preserved
%r2	callee preserved
%r3	callee preserved
%r4	callee preserved
%r5	callee preserved
%r6	caller preserved
%r7	caller preserved
%r8	parameter/caller preserved
%r9	parameter/caller preserved
%rA	return address
%rB	return value/parameter/caller preserved
%rC	parameter/caller preserved
%rD	parameter/caller preserved
%gsp(rE)	GPU stack pointer
%csp(rF)	CPU stack pointer

Calling Conventions

Copying MIPS syntax