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specification.md

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Instructions

operation immediate (only positive)
000 00000

Operation range: 0-7
Immediate range: 0-31

Operations

Operation Symbol Argument Binary Decimal
Reserved 000 0
Call syscall call immediate 001 1
Save to register save register id 010 2
Load to register load register id 011 3
Jump to address jump negative offset from current 100 4
Add from register add register id 101 5
Add immediate addi immediate 110 6
Skip next instruction if equals skipeq register id 111 7

Register ids

  • 0 - Zero constant
  • 1 - Usable register 1
  • 2 - Usable register 2
  • 3 - Usable register 3
  • 4 - Reserved for assembler
  • 5-31 - Usable registers

System calls

  • 0 - Do nothing
  • 1 - Print output
  • 5 - Read input
  • 10 - Exit program
  • 16 - Run function
  • 20 - Start function (only called by the assembler)
  • 21 - Return function (only called by the assembler)