merlin-utils/omf.h
Kelvin Sherlock 5159061ff0 initial WIP
2019-12-08 13:55:33 -05:00

80 lines
1.2 KiB
C++

#ifndef __omf_h__
#define __omf_h__
#include <stdint.h>
#include <vector>
#include <string>
namespace omf {
enum opcode : uint8_t {
END = 0x00,
// 0x01-0xdf CONST
ALIGN = 0xe0,
ORG = 0xe1,
RELOC = 0xe2,
INTERSEG = 0xe3,
USING = 0xe4,
STRONG = 0xe5,
GLOBAL = 0xe6,
GEQU = 0xe7,
MEM = 0xe8,
EXPR = 0xeb,
ZEXPR = 0xec,
BEXPR = 0xed,
RELEXPR = 0xee,
LOCAL = 0xef,
EQU = 0xf0,
DS = 0xf1,
LCONST = 0xf2,
LEXPR = 0xf3,
ENTRY = 0xf4,
cRELOC = 0xf5,
cINTERSEG = 0xf6,
SUPER = 0xf7,
};
struct reloc {
uint8_t size = 0;
uint8_t shift = 0;
uint32_t offset = 0;
uint32_t value = 0;
constexpr bool can_compress() const {
return offset <= 0xffff && value <= 0xffff;
}
};
struct interseg {
uint8_t size = 0;
uint8_t shift = 0;
uint32_t offset = 0;
uint16_t file = 1;
uint16_t segment = 0;
uint32_t segment_offset = 0;
constexpr bool can_compress() const {
return file == 1 && segment <= 255 && offset <= 0xffff && segment_offset <= 0xffff;
}
};
struct segment {
uint16_t segnum = 0;
uint16_t kind = 0;
std::string loadname;
std::string segname;
std::vector<uint8_t> data;
std::vector<interseg> intersegs;
std::vector<reloc> relocs;
};
}
#endif