Merge branch 'master' of https://github.com/pret/pokeemerald into porymap-6

src/AgbRfu_LinkManager.c

@@ -14,7 +14,7 @@
 #define FSP_ON    0x01
 #define FSP_START 0x02
 
-LINK_MANAGER lman;
+COMMON_DATA LINK_MANAGER lman = {0};
 
 static void rfu_LMAN_clearVariables(void);
 static void rfu_LMAN_settingPCSWITCH(u32 rand);

src/agb_flash.c

@@ -6,16 +6,16 @@ static u16 sTimerCount;
 static vu16 *sTimerReg;
 static u16 sSavedIme;
 
-u8 gFlashTimeoutFlag;
-u8 (*PollFlashStatus)(u8 *);
-u16 (*WaitForFlashWrite)(u8 phase, u8 *addr, u8 lastData);
-u16 (*ProgramFlashSector)(u16 sectorNum, u8 *src);
-const struct FlashType *gFlash;
-u16 (*ProgramFlashByte)(u16 sectorNum, u32 offset, u8 data);
-u16 gFlashNumRemainingBytes;
-u16 (*EraseFlashChip)();
-u16 (*EraseFlashSector)(u16 sectorNum);
-const u16 *gFlashMaxTime;
+COMMON_DATA u8 gFlashTimeoutFlag = 0;
+COMMON_DATA u8 (*PollFlashStatus)(u8 *) = NULL;
+COMMON_DATA u16 (*WaitForFlashWrite)(u8 phase, u8 *addr, u8 lastData) = NULL;
+COMMON_DATA u16 (*ProgramFlashSector)(u16 sectorNum, u8 *src) = NULL;
+COMMON_DATA const struct FlashType *gFlash = NULL;
+COMMON_DATA u16 (*ProgramFlashByte)(u16 sectorNum, u32 offset, u8 data) = NULL;
+COMMON_DATA u16 gFlashNumRemainingBytes = 0;
+COMMON_DATA u16 (*EraseFlashChip)() = NULL;
+COMMON_DATA u16 (*EraseFlashSector)(u16 sectorNum) = 0;
+COMMON_DATA const u16 *gFlashMaxTime = NULL;
 
 void SetReadFlash1(u16 *dest);
 

src/apprentice.c

@@ -75,9 +75,9 @@ struct ApprenticeQuestionData
 };
 
 // IWRAM common
-struct ApprenticePartyMovesData *gApprenticePartyMovesData;
-struct ApprenticeQuestionData *gApprenticeQuestionData;
-void (*gApprenticeFunc)(void);
+COMMON_DATA struct ApprenticePartyMovesData *gApprenticePartyMovesData = NULL;
+COMMON_DATA struct ApprenticeQuestionData *gApprenticeQuestionData = NULL;
+COMMON_DATA void (*gApprenticeFunc)(void) = NULL;
 
 // This file's functions.
 static u16 GetRandomAlternateMove(u8 monId);

src/battle_anim_throw.c

@@ -23,9 +23,9 @@
 #include "constants/rgb.h"
 
 // iwram
-u32 gMonShrinkDuration;
-u16 gMonShrinkDelta;
-u16 gMonShrinkDistance;
+COMMON_DATA u32 gMonShrinkDuration = 0;
+COMMON_DATA u16 gMonShrinkDelta = 0;
+COMMON_DATA u16 gMonShrinkDistance = 0;
 
 enum {
     BALL_ROLL_1,

src/battle_factory_screen.c

@@ -256,7 +256,7 @@ static struct FactorySelectScreen *sFactorySelectScreen;
 static void (*sSwap_CurrentOptionFunc)(u8 taskId);
 static struct FactorySwapScreen *sFactorySwapScreen;
 
-u8 (*gFactorySelect_CurrentOptionFunc)(void);
+COMMON_DATA u8 (*gFactorySelect_CurrentOptionFunc)(void) = NULL;
 
 static const u16 sPokeballGray_Pal[]         = INCBIN_U16("graphics/battle_frontier/factory_screen/pokeball_gray.gbapal");
 static const u16 sPokeballSelected_Pal[]     = INCBIN_U16("graphics/battle_frontier/factory_screen/pokeball_selected.gbapal");

src/battle_main.c

@@ -237,15 +237,15 @@ EWRAM_DATA u16 gBattleMovePower = 0;
 EWRAM_DATA u16 gMoveToLearn = 0;
 EWRAM_DATA u8 gBattleMonForms[MAX_BATTLERS_COUNT] = {0};
 
-void (*gPreBattleCallback1)(void);
-void (*gBattleMainFunc)(void);
-struct BattleResults gBattleResults;
-u8 gLeveledUpInBattle;
-void (*gBattlerControllerFuncs[MAX_BATTLERS_COUNT])(void);
-u8 gHealthboxSpriteIds[MAX_BATTLERS_COUNT];
-u8 gMultiUsePlayerCursor;
-u8 gNumberOfMovesToChoose;
-u8 gBattleControllerData[MAX_BATTLERS_COUNT]; // Used by the battle controllers to store misc sprite/task IDs for each battler
+COMMON_DATA void (*gPreBattleCallback1)(void) = NULL;
+COMMON_DATA void (*gBattleMainFunc)(void) = NULL;
+COMMON_DATA struct BattleResults gBattleResults = {0};
+COMMON_DATA u8 gLeveledUpInBattle = 0;
+COMMON_DATA void (*gBattlerControllerFuncs[MAX_BATTLERS_COUNT])(void) = {0};
+COMMON_DATA u8 gHealthboxSpriteIds[MAX_BATTLERS_COUNT] = {0};
+COMMON_DATA u8 gMultiUsePlayerCursor = 0;
+COMMON_DATA u8 gNumberOfMovesToChoose = 0;
+COMMON_DATA u8 gBattleControllerData[MAX_BATTLERS_COUNT] = {0}; // Used by the battle controllers to store misc sprite/task IDs for each battler
 
 static const struct ScanlineEffectParams sIntroScanlineParams16Bit =
 {

src/battle_tower.c

@@ -45,7 +45,7 @@ EWRAM_DATA const struct BattleFrontierTrainer *gFacilityTrainers = NULL;
 EWRAM_DATA const struct FacilityMon *gFacilityTrainerMons = NULL;
 
 // IWRAM common
-u16 gFrontierTempParty[MAX_FRONTIER_PARTY_SIZE];
+COMMON_DATA u16 gFrontierTempParty[MAX_FRONTIER_PARTY_SIZE] = {0};
 
 // This file's functions.
 static void InitTowerChallenge(void);

src/berry_blender.c

@@ -246,7 +246,7 @@ static s16 sPokeblockPresentFlavors[FLAVOR_COUNT + 1];
 static s16 sDebug_MaxRPMStage;
 static s16 sDebug_GameTimeStage;
 
-u8 gInGameOpponentsNo;
+COMMON_DATA u8 gInGameOpponentsNo = 0;
 
 static const u16 sBlenderCenter_Pal[] = INCBIN_U16("graphics/berry_blender/center.gbapal");
 static const u8 sBlenderCenter_Tilemap[] = INCBIN_U8("graphics/berry_blender/center_map.bin");

src/bg.c

@@ -42,7 +42,7 @@ static struct BgControl sGpuBgConfigs;
 static struct BgConfig2 sGpuBgConfigs2[NUM_BACKGROUNDS];
 static u32 sDmaBusyBitfield[NUM_BACKGROUNDS];
 
-u32 gWindowTileAutoAllocEnabled;
+COMMON_DATA u32 gWindowTileAutoAllocEnabled = 0;
 
 static const struct BgConfig sZeroedBgControlStruct = { 0 };
 

src/contest.c

@@ -358,7 +358,7 @@ EWRAM_DATA bool8 gCurContestWinnerIsForArtist = 0;
 EWRAM_DATA u8 gCurContestWinnerSaveIdx = 0;
 
 // IWRAM common vars.
-u32 gContestRngValue;
+COMMON_DATA u32 gContestRngValue = 0;
 
 extern const u8 gText_LinkStandby4[];
 extern const u8 gText_BDot[];

src/contest_painting.c

@@ -21,10 +21,10 @@
 #include "window.h"
 #include "constants/rgb.h"
 
-u16 (*gContestMonPixels)[][32];
-struct ImageProcessingContext gImageProcessingContext;
-struct ContestWinner *gContestPaintingWinner;
-u16 *gContestPaintingMonPalette;
+COMMON_DATA u16 (*gContestMonPixels)[][32] = {0};
+COMMON_DATA struct ImageProcessingContext gImageProcessingContext = {0};
+COMMON_DATA struct ContestWinner *gContestPaintingWinner = {0};
+COMMON_DATA u16 *gContestPaintingMonPalette = NULL;
 
 static u8 sHoldState;
 static u16 sMosaicVal;

src/ereader_screen.c

@@ -41,9 +41,9 @@ struct EReaderData
 static void Task_EReader(u8);
 
 // This belongs in COMMON somewhere between party_menu and ereader_screen, but it's unused so it's unclear where.
-UNUSED u8 gUnknownSpace[64];
+COMMON_DATA UNUSED u8 gUnknownSpace[64] = {0};
 
-struct EReaderData gEReaderData;
+COMMON_DATA struct EReaderData gEReaderData = {0};
 
 extern const u8 gMultiBootProgram_EReader_Start[];
 extern const u8 gMultiBootProgram_EReader_End[];

src/evolution_scene.c

@@ -48,7 +48,7 @@ struct EvoInfo
 static EWRAM_DATA struct EvoInfo *sEvoStructPtr = NULL;
 static EWRAM_DATA u16 *sBgAnimPal = NULL;
 
-void (*gCB2_AfterEvolution)(void);
+COMMON_DATA void (*gCB2_AfterEvolution)(void) = NULL;
 
 #define sEvoCursorPos           gBattleCommunication[1] // when learning a new move
 #define sEvoGraphicsTaskId      gBattleCommunication[2]

src/field_camera.c

@@ -39,9 +39,9 @@ static s16 sVerticalCameraPan;
 static bool8 sBikeCameraPanFlag;
 static void (*sFieldCameraPanningCallback)(void);
 
-struct CameraObject gFieldCamera;
-u16 gTotalCameraPixelOffsetY;
-u16 gTotalCameraPixelOffsetX;
+COMMON_DATA struct CameraObject gFieldCamera = {0};
+COMMON_DATA u16 gTotalCameraPixelOffsetY = 0;
+COMMON_DATA u16 gTotalCameraPixelOffsetX = 0;
 
 static void ResetCameraOffset(struct FieldCameraOffset *cameraOffset)
 {

src/field_control_avatar.c

@@ -38,7 +38,7 @@
 static EWRAM_DATA u8 sWildEncounterImmunitySteps = 0;
 static EWRAM_DATA u16 sPrevMetatileBehavior = 0;
 
-u8 gSelectedObjectEvent;
+COMMON_DATA u8 gSelectedObjectEvent = 0;
 
 static void GetPlayerPosition(struct MapPosition *);
 static void GetInFrontOfPlayerPosition(struct MapPosition *);

src/field_specials.c

@@ -92,7 +92,7 @@ static EWRAM_DATA u8 sFrontierExchangeCorner_ItemIconWindowId = 0;
 static EWRAM_DATA u8 sPCBoxToSendMon = 0;
 static EWRAM_DATA u32 sBattleTowerMultiBattleTypeFlags = 0;
 
-struct ListMenuTemplate gScrollableMultichoice_ListMenuTemplate;
+COMMON_DATA struct ListMenuTemplate gScrollableMultichoice_ListMenuTemplate = {0};
 
 void TryLoseFansFromPlayTime(void);
 void SetPlayerGotFirstFans(void);

src/fieldmap.c

@@ -31,7 +31,7 @@ EWRAM_DATA struct Camera gCamera = {0};
 EWRAM_DATA static struct ConnectionFlags sMapConnectionFlags = {0};
 EWRAM_DATA static u32 UNUSED sFiller = 0; // without this, the next file won't align properly
 
-struct BackupMapLayout gBackupMapLayout;
+COMMON_DATA struct BackupMapLayout gBackupMapLayout = {0};
 
 static const struct ConnectionFlags sDummyConnectionFlags = {0};
 

src/image_processing_effects.c

@@ -4,16 +4,16 @@
 #include "constants/rgb.h"
 
 // IWRAM common
-u8 gCanvasColumnStart;
-u16 *gCanvasPixels;
-u8 gCanvasRowEnd;
-u8 gCanvasHeight;
-u8 gCanvasColumnEnd;
-u8 gCanvasRowStart;
-u8 gCanvasMonPersonality;
-u8 gCanvasWidth;
-u16 *gCanvasPalette;
-u16 gCanvasPaletteStart;
+COMMON_DATA u8 gCanvasColumnStart = 0;
+COMMON_DATA u16 *gCanvasPixels = NULL;
+COMMON_DATA u8 gCanvasRowEnd = 0;
+COMMON_DATA u8 gCanvasHeight = 0;
+COMMON_DATA u8 gCanvasColumnEnd = 0;
+COMMON_DATA u8 gCanvasRowStart = 0;
+COMMON_DATA u8 gCanvasMonPersonality = 0;
+COMMON_DATA u8 gCanvasWidth = 0;
+COMMON_DATA u16 *gCanvasPalette = NULL;
+COMMON_DATA u16 gCanvasPaletteStart = 0;
 
 static void ApplyImageEffect_Pointillism(void);
 static void ApplyImageEffect_Blur(void);

src/intro.c

@@ -178,8 +178,8 @@ static EWRAM_DATA u16 sIntroCharacterGender = 0;
 static EWRAM_DATA u16 UNUSED sUnusedVar = 0;
 static EWRAM_DATA u16 sFlygonYOffset = 0;
 
-u32 gIntroFrameCounter;
-struct GcmbStruct gMultibootProgramStruct;
+COMMON_DATA u32 gIntroFrameCounter = 0;
+COMMON_DATA struct GcmbStruct gMultibootProgramStruct = {0};
 
 static const u16 sIntroDrops_Pal[]            = INCBIN_U16("graphics/intro/scene_1/drops.gbapal");
 static const u16 sIntroLogo_Pal[]             = INCBIN_U16("graphics/intro/scene_1/logo.gbapal");

src/librfu_rfu.c

@@ -76,11 +76,11 @@ static void rfu_STC_NI_receive_Sender(u8, u8, const struct RfuLocalStruct *, UNU
 static void rfu_STC_NI_initSlot_asRecvDataEntity(u8, struct NIComm *);
 static void rfu_STC_NI_initSlot_asRecvControllData(u8, struct NIComm *);
 
-struct RfuSlotStatusUNI *gRfuSlotStatusUNI[RFU_CHILD_MAX];
-struct RfuSlotStatusNI *gRfuSlotStatusNI[RFU_CHILD_MAX];
-struct RfuLinkStatus *gRfuLinkStatus;
-struct RfuStatic *gRfuStatic;
-struct RfuFixed *gRfuFixed;
+COMMON_DATA struct RfuSlotStatusUNI *gRfuSlotStatusUNI[RFU_CHILD_MAX] = {0};
+COMMON_DATA struct RfuSlotStatusNI *gRfuSlotStatusNI[RFU_CHILD_MAX] = {0};
+COMMON_DATA struct RfuLinkStatus *gRfuLinkStatus = NULL;
+COMMON_DATA struct RfuStatic *gRfuStatic = NULL;
+COMMON_DATA struct RfuFixed *gRfuFixed = NULL;
 
 static const struct LLSFStruct llsf_struct[2] = {
     [MODE_CHILD] = {

src/librfu_sio32id.c

@@ -15,7 +15,7 @@ struct RfuSIO32Id
     u16 lastId;
 };
 
-struct RfuSIO32Id gRfuSIO32Id;
+COMMON_DATA struct RfuSIO32Id gRfuSIO32Id = {0};
 
 static const u16 Sio32ConnectionData[] = { 0x494e, 0x544e, 0x4e45, 0x4f44 }; // NINTENDO
 static const char Sio32IDLib_Var[] = "Sio32ID_030820";

src/librfu_stwi.c

@@ -8,7 +8,7 @@ static void STWI_stop_timer(void);
 static s32 STWI_restart_Command(void);
 static s32 STWI_reset_ClockCounter(void);
 
-struct STWIStatus *gSTWIStatus;
+COMMON_DATA struct STWIStatus *gSTWIStatus = NULL;
 
 void STWI_init_all(struct RfuIntrStruct *interruptStruct, IntrFunc *interrupt, bool8 copyInterruptToRam)
 {

src/link.c

@@ -68,41 +68,41 @@ static u16 sRecvNonzeroCheck;
 static u8 sChecksumAvailable;
 static u8 sHandshakePlayerCount;
 
-u16 gLinkPartnersHeldKeys[6];
-u32 gLinkDebugSeed;
-struct LinkPlayerBlock gLocalLinkPlayerBlock;
-bool8 gLinkErrorOccurred;
-u32 gLinkDebugFlags;
-u32 gLinkFiller1;
-bool8 gRemoteLinkPlayersNotReceived[MAX_LINK_PLAYERS];
-u8 gBlockReceivedStatus[MAX_LINK_PLAYERS];
-u32 gLinkFiller2;
-u16 gLinkHeldKeys;
-u16 ALIGNED(4) gRecvCmds[MAX_RFU_PLAYERS][CMD_LENGTH];
-u32 gLinkStatus;
-bool8 gLinkDummy1; // Never read
-bool8 gLinkDummy2; // Never read
-bool8 gReadyToExitStandby[MAX_LINK_PLAYERS];
-bool8 gReadyToCloseLink[MAX_LINK_PLAYERS];
-u16 gReadyCloseLinkType; // Never read
-u8 gSuppressLinkErrorMessage;
-bool8 gWirelessCommType;
-bool8 gSavedLinkPlayerCount;
-u16 gSendCmd[CMD_LENGTH];
-u8 gSavedMultiplayerId;
-bool8 gReceivedRemoteLinkPlayers;
-struct LinkTestBGInfo gLinkTestBGInfo;
-void (*gLinkCallback)(void);
-u8 gShouldAdvanceLinkState;
-u16 gLinkTestBlockChecksums[MAX_LINK_PLAYERS];
-u8 gBlockRequestType;
-u32 gLinkFiller3;
-u32 gLinkFiller4;
-u32 gLinkFiller5;
-u8 gLastSendQueueCount;
-struct Link gLink;
-u8 gLastRecvQueueCount;
-u16 gLinkSavedIme;
+COMMON_DATA u16 gLinkPartnersHeldKeys[6] = {0};
+COMMON_DATA u32 gLinkDebugSeed = 0;
+COMMON_DATA struct LinkPlayerBlock gLocalLinkPlayerBlock = {0};
+COMMON_DATA bool8 gLinkErrorOccurred = 0;
+COMMON_DATA u32 gLinkDebugFlags = 0;
+COMMON_DATA u32 gLinkFiller1 = 0;
+COMMON_DATA bool8 gRemoteLinkPlayersNotReceived[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u8 gBlockReceivedStatus[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u32 gLinkFiller2 = 0;
+COMMON_DATA u16 gLinkHeldKeys = 0;
+COMMON_DATA u16 ALIGNED(4) gRecvCmds[MAX_RFU_PLAYERS][CMD_LENGTH] = {0};
+COMMON_DATA u32 gLinkStatus = 0;
+COMMON_DATA bool8 gLinkDummy1 = 0; // Never read
+COMMON_DATA bool8 gLinkDummy2 = 0; // Never read
+COMMON_DATA bool8 gReadyToExitStandby[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA bool8 gReadyToCloseLink[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u16 gReadyCloseLinkType = 0; // Never read
+COMMON_DATA u8 gSuppressLinkErrorMessage = 0;
+COMMON_DATA bool8 gWirelessCommType = 0;
+COMMON_DATA bool8 gSavedLinkPlayerCount = 0;
+COMMON_DATA u16 gSendCmd[CMD_LENGTH] = {0};
+COMMON_DATA u8 gSavedMultiplayerId = 0;
+COMMON_DATA bool8 gReceivedRemoteLinkPlayers = 0;
+COMMON_DATA struct LinkTestBGInfo gLinkTestBGInfo = {0};
+COMMON_DATA void (*gLinkCallback)(void) = NULL;
+COMMON_DATA u8 gShouldAdvanceLinkState = 0;
+COMMON_DATA u16 gLinkTestBlockChecksums[MAX_LINK_PLAYERS] = {0};
+COMMON_DATA u8 gBlockRequestType = 0;
+COMMON_DATA u32 gLinkFiller3 = 0;
+COMMON_DATA u32 gLinkFiller4 = 0;
+COMMON_DATA u32 gLinkFiller5 = 0;
+COMMON_DATA u8 gLastSendQueueCount = 0;
+COMMON_DATA struct Link gLink = {0};
+COMMON_DATA u8 gLastRecvQueueCount = 0;
+COMMON_DATA u16 gLinkSavedIme = 0;
 
 static EWRAM_DATA u8 sLinkTestDebugValuesEnabled = 0;
 static EWRAM_DATA u8 sDummyFlag = FALSE;

src/link_rfu_2.c

@@ -77,8 +77,8 @@ struct RfuDebug
     u8 unused4[88];
 };
 
-u32 gRfuAPIBuffer[RFU_API_BUFF_SIZE_RAM / 4];
-struct RfuManager gRfu;
+COMMON_DATA u32 gRfuAPIBuffer[RFU_API_BUFF_SIZE_RAM / 4] = {0};
+COMMON_DATA struct RfuManager gRfu = {0};
 
 static u8 sHeldKeyCount;
 static u8 sResendBlock8[CMD_LENGTH * 2];

src/list_menu.c

@@ -99,7 +99,7 @@ static EWRAM_DATA struct {
 EWRAM_DATA struct ScrollArrowsTemplate gTempScrollArrowTemplate = {0};
 
 // IWRAM common
-struct {
+COMMON_DATA struct {
     u8 cursorPal:4;
     u8 fillValue:4;
     u8 cursorShadowPal:4;
@@ -107,9 +107,9 @@ struct {
     u8 field_2_2:6; // unused
     u8 fontId:7;
     bool8 enabled:1;
-} gListMenuOverride;
+} gListMenuOverride = {0};
 
-struct ListMenuTemplate gMultiuseListMenuTemplate;
+COMMON_DATA struct ListMenuTemplate gMultiuseListMenuTemplate = {0};
 
 // const rom data
 static const struct

src/load_save.c

@@ -37,10 +37,10 @@ EWRAM_DATA struct LoadedSaveData gLoadedSaveData = {0};
 EWRAM_DATA u32 gLastEncryptionKey = 0;
 
 // IWRAM common
-bool32 gFlashMemoryPresent;
-struct SaveBlock1 *gSaveBlock1Ptr;
-struct SaveBlock2 *gSaveBlock2Ptr;
-struct PokemonStorage *gPokemonStoragePtr;
+COMMON_DATA bool32 gFlashMemoryPresent = 0;
+COMMON_DATA struct SaveBlock1 *gSaveBlock1Ptr = NULL;
+COMMON_DATA struct SaveBlock2 *gSaveBlock2Ptr = NULL;
+COMMON_DATA struct PokemonStorage *gPokemonStoragePtr = NULL;
 
 // code
 void CheckForFlashMemory(void)

src/m4a.c

@@ -7,18 +7,18 @@ extern const u8 gCgb3Vol[];
 
 BSS_CODE ALIGNED(4) char SoundMainRAM_Buffer[0x800] = {0};
 
-struct SoundInfo gSoundInfo;
-struct PokemonCrySong gPokemonCrySongs[MAX_POKEMON_CRIES];
-struct MusicPlayerInfo gPokemonCryMusicPlayers[MAX_POKEMON_CRIES];
-MPlayFunc gMPlayJumpTable[36];
-struct CgbChannel gCgbChans[4];
-struct MusicPlayerTrack gPokemonCryTracks[MAX_POKEMON_CRIES * 2];
-struct PokemonCrySong gPokemonCrySong;
-struct MusicPlayerInfo gMPlayInfo_BGM;
-struct MusicPlayerInfo gMPlayInfo_SE1;
-struct MusicPlayerInfo gMPlayInfo_SE2;
-struct MusicPlayerInfo gMPlayInfo_SE3;
-u8 gMPlayMemAccArea[0x10];
+COMMON_DATA struct SoundInfo gSoundInfo = {0};
+COMMON_DATA struct PokemonCrySong gPokemonCrySongs[MAX_POKEMON_CRIES] = {0};
+COMMON_DATA struct MusicPlayerInfo gPokemonCryMusicPlayers[MAX_POKEMON_CRIES] = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_BGM = {0};
+COMMON_DATA MPlayFunc gMPlayJumpTable[36] = {0};
+COMMON_DATA struct CgbChannel gCgbChans[4] = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE1 = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE2 = {0};
+COMMON_DATA struct MusicPlayerTrack gPokemonCryTracks[MAX_POKEMON_CRIES * 2] = {0};
+COMMON_DATA struct PokemonCrySong gPokemonCrySong = {0};
+COMMON_DATA u8 gMPlayMemAccArea[0x10] = {0};
+COMMON_DATA struct MusicPlayerInfo gMPlayInfo_SE3 = {0};
 
 u32 MidiKeyToFreq(struct WaveData *wav, u8 key, u8 fineAdjust)
 {

src/main.c

@@ -59,15 +59,15 @@ const IntrFunc gIntrTableTemplate[] =
 
 static u16 sUnusedVar; // Never read
 
-u16 gKeyRepeatStartDelay;
-bool8 gLinkTransferringData;
-struct Main gMain;
-u16 gKeyRepeatContinueDelay;
-bool8 gSoftResetDisabled;
-IntrFunc gIntrTable[INTR_COUNT];
-u8 gLinkVSyncDisabled;
-u32 IntrMain_Buffer[0x200];
-s8 gPcmDmaCounter;
+COMMON_DATA u16 gKeyRepeatStartDelay = 0;
+COMMON_DATA bool8 gLinkTransferringData = 0;
+COMMON_DATA struct Main gMain = {0};
+COMMON_DATA u16 gKeyRepeatContinueDelay = 0;
+COMMON_DATA bool8 gSoftResetDisabled = 0;
+COMMON_DATA IntrFunc gIntrTable[INTR_COUNT] = {0};
+COMMON_DATA u8 gLinkVSyncDisabled = 0;
+COMMON_DATA u32 IntrMain_Buffer[0x200] = {0};
+COMMON_DATA s8 gPcmDmaCounter = 0;
 
 static EWRAM_DATA u16 sTrainerId = 0;
 

src/mauville_old_man.c

@@ -31,7 +31,7 @@ static void Storyteller_ResetFlag(void);
 
 static u8 sSelectedStory;
 
-struct BardSong gBardSong;
+COMMON_DATA struct BardSong gBardSong = {0};
 
 static EWRAM_DATA u16 sUnknownBardRelated = 0;
 static EWRAM_DATA struct MauvilleManStoryteller * sStorytellerPtr = NULL;

src/overworld.c

@@ -180,14 +180,14 @@ static u16 (*sPlayerKeyInterceptCallback)(u32);
 static bool8 sReceivingFromLink;
 static u8 sRfuKeepAliveTimer;
 
-u16 *gOverworldTilemapBuffer_Bg2;
-u16 *gOverworldTilemapBuffer_Bg1;
-u16 *gOverworldTilemapBuffer_Bg3;
-u16 gHeldKeyCodeToSend;
-void (*gFieldCallback)(void);
-bool8 (*gFieldCallback2)(void);
-u8 gLocalLinkPlayerId; // This is our player id in a multiplayer mode.
-u8 gFieldLinkPlayerCount;
+COMMON_DATA u16 *gOverworldTilemapBuffer_Bg2 = NULL;
+COMMON_DATA u16 *gOverworldTilemapBuffer_Bg1 = NULL;
+COMMON_DATA u16 *gOverworldTilemapBuffer_Bg3 = NULL;
+COMMON_DATA u16 gHeldKeyCodeToSend = 0;
+COMMON_DATA void (*gFieldCallback)(void) = NULL;
+COMMON_DATA bool8 (*gFieldCallback2)(void) = NULL;
+COMMON_DATA u8 gLocalLinkPlayerId = 0; // This is our player id in a multiplayer mode.
+COMMON_DATA u8 gFieldLinkPlayerCount = 0;
 
 EWRAM_DATA static u8 sObjectEventLoadFlag = 0;
 EWRAM_DATA struct WarpData gLastUsedWarp = {0};

src/party_menu.c

@@ -231,7 +231,7 @@ static EWRAM_DATA u16 sUnused = 0;
 EWRAM_DATA u8 gBattlePartyCurrentOrder[PARTY_SIZE / 2] = {0}; // bits 0-3 are the current pos of Slot 1, 4-7 are Slot 2, and so on
 
 // IWRAM common
-void (*gItemUseCB)(u8, TaskFunc);
+COMMON_DATA void (*gItemUseCB)(u8, TaskFunc) = NULL;
 
 static void ResetPartyMenu(void);
 static void CB2_InitPartyMenu(void);

src/pokedex.c

@@ -121,8 +121,8 @@ static EWRAM_DATA u8 sPokeBallRotation = 0;
 static EWRAM_DATA struct PokedexListItem *sPokedexListItem = NULL;
 
 // This is written to, but never read.
-u8 gUnusedPokedexU8;
-void (*gPokedexVBlankCB)(void);
+COMMON_DATA u8 gUnusedPokedexU8 = 0;
+COMMON_DATA void (*gPokedexVBlankCB)(void) = NULL;
 
 struct SearchOptionText
 {

src/pokedex_cry_screen.c

@@ -60,7 +60,7 @@ static void SpriteCB_CryMeterNeedle(struct Sprite *);
 static void SetCryMeterNeedleTarget(s8);
 
 // IWRAM common
-u8 gDexCryScreenState;
+COMMON_DATA u8 gDexCryScreenState = 0;
 
 // EWRAM vars
 static EWRAM_DATA struct PokedexCryScreen *sDexCryScreen = NULL;

src/random.c

@@ -5,8 +5,8 @@ EWRAM_DATA static u8 sUnknown = 0;
 EWRAM_DATA static u32 sRandCount = 0;
 
 // IWRAM common
-u32 gRngValue;
-u32 gRng2Value;
+COMMON_DATA u32 gRngValue = 0;
+COMMON_DATA u32 gRng2Value = 0;
 
 u16 Random(void)
 {

src/rtc.c

@@ -10,7 +10,7 @@ static u8 sProbeResult;
 static u16 sSavedIme;
 
 // iwram common
-struct Time gLocalTime;
+COMMON_DATA struct Time gLocalTime = {0};
 
 // const rom
 

src/save.c

@@ -79,19 +79,19 @@ STATIC_ASSERT(sizeof(struct SaveBlock2) <= SECTOR_DATA_SIZE, SaveBlock2FreeSpace
 STATIC_ASSERT(sizeof(struct SaveBlock1) <= SECTOR_DATA_SIZE * (SECTOR_ID_SAVEBLOCK1_END - SECTOR_ID_SAVEBLOCK1_START + 1), SaveBlock1FreeSpace);
 STATIC_ASSERT(sizeof(struct PokemonStorage) <= SECTOR_DATA_SIZE * (SECTOR_ID_PKMN_STORAGE_END - SECTOR_ID_PKMN_STORAGE_START + 1), PokemonStorageFreeSpace);
 
-u16 gLastWrittenSector;
-u32 gLastSaveCounter;
-u16 gLastKnownGoodSector;
-u32 gDamagedSaveSectors;
-u32 gSaveCounter;
-struct SaveSector *gReadWriteSector; // Pointer to a buffer for reading/writing a sector
-u16 gIncrementalSectorId;
-u16 gSaveUnusedVar;
-u16 gSaveFileStatus;
-void (*gGameContinueCallback)(void);
-struct SaveSectorLocation gRamSaveSectorLocations[NUM_SECTORS_PER_SLOT];
-u16 gSaveUnusedVar2;
-u16 gSaveAttemptStatus;
+COMMON_DATA u16 gLastWrittenSector = 0;
+COMMON_DATA u32 gLastSaveCounter = 0;
+COMMON_DATA u16 gLastKnownGoodSector = 0;
+COMMON_DATA u32 gDamagedSaveSectors = 0;
+COMMON_DATA u32 gSaveCounter = 0;
+COMMON_DATA struct SaveSector *gReadWriteSector = NULL; // Pointer to a buffer for reading/writing a sector
+COMMON_DATA u16 gIncrementalSectorId = 0;
+COMMON_DATA u16 gSaveUnusedVar = 0;
+COMMON_DATA u16 gSaveFileStatus = 0;
+COMMON_DATA void (*gGameContinueCallback)(void) = NULL;
+COMMON_DATA struct SaveSectorLocation gRamSaveSectorLocations[NUM_SECTORS_PER_SLOT] = {0};
+COMMON_DATA u16 gSaveUnusedVar2 = 0;
+COMMON_DATA u16 gSaveAttemptStatus = 0;
 
 EWRAM_DATA struct SaveSector gSaveDataBuffer = {0}; // Buffer used for reading/writing sectors
 EWRAM_DATA static u8 sUnusedVar = 0;

src/sound.c

@@ -23,7 +23,7 @@ static u8 sMapMusicState;
 static u8 sMapMusicFadeInSpeed;
 static u16 sFanfareCounter;
 
-bool8 gDisableMusic;
+COMMON_DATA bool8 gDisableMusic = 0;
 
 extern struct ToneData gCryTable[];
 extern struct ToneData gCryTable_Reverse[];

src/sprite.c

@@ -276,8 +276,8 @@ static struct AffineAnimState sAffineAnimStates[OAM_MATRIX_COUNT];
 static u16 sSpritePaletteTags[16];
 
 // iwram common
-u32 gOamMatrixAllocBitmap;
-u8 gReservedSpritePaletteCount;
+COMMON_DATA u32 gOamMatrixAllocBitmap = 0;
+COMMON_DATA u8 gReservedSpritePaletteCount = 0;
 
 EWRAM_DATA struct Sprite gSprites[MAX_SPRITES + 1] = {0};
 EWRAM_DATA static u16 sSpritePriorities[MAX_SPRITES] = {0};

src/start_menu.c

@@ -75,7 +75,7 @@ enum
 };
 
 // IWRAM common
-bool8 (*gMenuCallback)(void);
+COMMON_DATA bool8 (*gMenuCallback)(void) = NULL;
 
 // EWRAM
 EWRAM_DATA static u8 sSafariBallsWindowId = 0;

src/task.c

@@ -1,7 +1,7 @@
 #include "global.h"
 #include "task.h"
 
-struct Task gTasks[NUM_TASKS];
+COMMON_DATA struct Task gTasks[NUM_TASKS] = {0};
 
 static void InsertTask(u8 newTaskId);
 static u8 FindFirstActiveTask(void);

src/text.c

@@ -43,10 +43,10 @@ static u16 sLastTextBgColor;
 static u16 sLastTextFgColor;
 static u16 sLastTextShadowColor;
 
-const struct FontInfo *gFonts;
-bool8 gDisableTextPrinters;
-struct TextGlyph gCurGlyph;
-TextFlags gTextFlags;
+COMMON_DATA const struct FontInfo *gFonts = NULL;
+COMMON_DATA bool8 gDisableTextPrinters = 0;
+COMMON_DATA struct TextGlyph gCurGlyph = {0};
+COMMON_DATA TextFlags gTextFlags = {0};
 
 static const u8 sFontHalfRowOffsets[] =
 {

src/trainer_see.c

@@ -49,11 +49,11 @@ static bool8 WaitRevealBuriedTrainer(u8 taskId, struct Task *task, struct Object
 static void SpriteCB_TrainerIcons(struct Sprite *sprite);
 
 // IWRAM common
-u16 gWhichTrainerToFaceAfterBattle;
-u8 gPostBattleMovementScript[4];
-struct ApproachingTrainer gApproachingTrainers[2];
-u8 gNoOfApproachingTrainers;
-bool8 gTrainerApproachedPlayer;
+COMMON_DATA u16 gWhichTrainerToFaceAfterBattle = 0;
+COMMON_DATA u8 gPostBattleMovementScript[4] = {0};
+COMMON_DATA struct ApproachingTrainer gApproachingTrainers[2] = {0};
+COMMON_DATA u8 gNoOfApproachingTrainers = 0;
+COMMON_DATA bool8 gTrainerApproachedPlayer = 0;
 
 // EWRAM
 EWRAM_DATA u8 gApproachingTrainerId = 0;

src/tv.c

@@ -63,14 +63,14 @@ enum {
     ROULETTE,
 };
 
-s8 sCurTVShowSlot;
-u16 sTV_SecretBaseVisitMovesTemp[8];
-u8 sTV_DecorationsBuffer[DECOR_MAX_SECRET_BASE];
-struct {
+COMMON_DATA s8 sCurTVShowSlot = 0;
+COMMON_DATA u16 sTV_SecretBaseVisitMovesTemp[8] = {0};
+COMMON_DATA u8 sTV_DecorationsBuffer[DECOR_MAX_SECRET_BASE] = {0};
+COMMON_DATA struct {
     u8 level;
     u16 species;
     u16 move;
-} sTV_SecretBaseVisitMonsTemp[10];
+} sTV_SecretBaseVisitMonsTemp[10] = {0};
 
 static u8 sTVShowMixingNumPlayers;
 static u8 sTVShowNewsMixingNumPlayers;

src/window.c

@@ -5,8 +5,8 @@
 #include "blit.h"
 
 // This global is set to 0 and never changed.
-u8 gTransparentTileNumber;
-void *gWindowBgTilemapBuffers[NUM_BACKGROUNDS];
+COMMON_DATA u8 gTransparentTileNumber = 0;
+COMMON_DATA void *gWindowBgTilemapBuffers[NUM_BACKGROUNDS] = {0};
 extern u32 gWindowTileAutoAllocEnabled;
 
 EWRAM_DATA struct Window gWindows[WINDOWS_MAX] = {0};