#ifndef OSLINK_H
#define OSLINK_H

#include "dolphin/types.h"

#ifdef __cplusplus
extern "C" {
#endif

#define OS_MODULE_VERSION 3

typedef struct OSModuleHeader OSModuleHeader;

typedef u32 OSModuleID;
typedef struct OSModuleQueue OSModuleQueue;
typedef struct OSModuleLink OSModuleLink;
typedef struct OSModuleInfo OSModuleInfo;
typedef struct OSSectionInfo OSSectionInfo;
typedef struct OSImportInfo OSImportInfo;
typedef struct OSRel OSRel;

OSModuleQueue __OSModuleList : 0x800030C8;
void* __OSStringTable : 0x800030D0;

struct OSModuleQueue {
    OSModuleInfo* head;
    OSModuleInfo* tail;
};

struct OSModuleLink {
    OSModuleInfo* next;
    OSModuleInfo* prev;
};

struct OSSectionInfo {
    u32 offset;
    u32 size;
};

struct OSModuleInfo {
    OSModuleID id;          // unique identifier for the module
    OSModuleLink link;      // doubly linked list of modules
    u32 numSections;        // # of sections
    u32 sectionInfoOffset;  // offset to section info table
    u32 nameOffset;         // offset to module name
    u32 nameSize;           // size of module name
    u32 version;            // version number
};

struct OSModuleHeader {
    // CAUTION: info must be the 1st member
    OSModuleInfo info;

    // OS_MODULE_VERSION == 1
    u32 bssSize;  // total size of bss sections in bytes
    u32 relOffset;
    u32 impOffset;
    u32 impSize;           // size in bytes
    u8 prologSection;      // section # for prolog function
    u8 epilogSection;      // section # for epilog function
    u8 unresolvedSection;  // section # for unresolved function
    u8 bssSection;         // section # for bss section (set at run-time)
    u32 prolog;            // prolog function offset
    u32 epilog;            // epilog function offset
    u32 unresolved;        // unresolved function offset

    // OS_MODULE_VERSION == 2
#if (2 <= OS_MODULE_VERSION)
    u32 align;     // module alignment constraint
    u32 bssAlign;  // bss alignment constraint
#endif

    // OS_MODULE_VERSION == 3
#if (3 <= OS_MODULE_VERSION)
    u32 fixSize;
#endif
};

#define OSGetSectionInfo(module) ((OSSectionInfo*)(((OSModuleInfo*)(module))->sectionInfoOffset))

#define OS_SECTIONINFO_EXEC 0x1
#define OS_SECTIONINFO_OFFSET(offset) ((offset) & ~0x1)

struct OSImportInfo {
    OSModuleID id;  // external module id
    u32 offset;     // offset to OSRel instructions
};

struct OSRel {
    u16 offset;  // byte offset from the previous entry
    u8 type;
    u8 section;
    u32 addend;
};

#define R_DOLPHIN_NOP 201      //  C9h current offset += OSRel.offset
#define R_DOLPHIN_SECTION 202  //  CAh current section = OSRel.section
#define R_DOLPHIN_END 203      //  CBh
#define R_DOLPHIN_MRKREF 204   //  CCh

BOOL OSLink(OSModuleInfo* newModule, void* bss);
BOOL OSLinkFixed(OSModuleInfo* newModule, void* bss);
BOOL OSUnlink(OSModuleInfo* module);
void OSSetStringTable(void* string_table);
void __OSModuleInit(void);

#ifdef __cplusplus
};
#endif

#endif /* OSLINK_H */