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OS Specification.md

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Kyouma OS Specification

Kyouma OS is an OS specifically written for Kyouma CPU and supporting devices. Currently non existent.

Kyouma Executable and Linkable Format

Executables and object files in Kyouma OS have ELF format. Specifically LSB 32-bit ELF format.

Relocations

Kyouma CPU architecture uses only Elf32_Rel relocation entries, addend is stored in relocation field

  • S - value of the symbol.
  • A - value at relocation field Value of relocation V is always calculated as S + A

####Relocation types:

Name Value Field Relocation place Calculation
NoRelocation 0 none none none
HiRelocation 1 word32 instr[17..4] V[31..18]
LoRelocation 2 word32 instr[23..4] V[19..0]
FullRelocation 3 word32 instr[31..0] V[31..0]
LoRelocationImm 4 word32 instr[17..4] V[12..0]