decompile save_failed_screen.c except for two functions (#130)

* begin decompiling save_failed_screen.c

* add revision differences for sub_8146E50

* decompile sub_8147048

* help

* get sub_8147324 to almost match except for a single instruction

* finish decompiling save_failed_screen.c except for two nonmatching functions

2 files changed, 478 insertions, 4 deletions

diff --git a/src/save_failed_screen.c b/src/save_failed_screen.c
new file mode 100644
index 000000000..c35118858
--- /dev/null
+++ b/src/save_failed_screen.c
@@ -0,0 +1,474 @@
+#include "global.h"
+#include "main.h"
+#include "sprite.h"
+#include "palette.h"
+#include "task.h"
+#include "text.h"
+#include "menu.h"
+#include "save.h"
+#include "m4a.h"
+#include "gba/flash_internal.h"
+
+extern u8 unk_2000000[];
+
+extern u16 gUnknown_0203933C;
+extern u16 gUnknown_0203933E;
+extern u32 gUnknown_03005EA8;
+extern u32 gUnknown_03005EBC;
+
+extern u8 gBirchHelpGfx[];
+
+extern u8 gSystemText_SaveFailedBackupCheck[];
+extern u8 gSystemText_CheckCompleteSaveAttempt[];
+extern u8 gSystemText_BackupDamagedGameContinue[];
+extern u8 gSystemText_SaveCompletedPressA[];
+extern u8 gSystemText_SaveCompletedGameEnd[];
+extern u8 gSystemText_GameplayEnded[];
+
+extern u8 gBirchGrassTilemap[];
+extern u8 gBirchBagTilemap[];
+
+extern const u8 gSaveFailedClockGfx[];
+extern const u8 gSaveFailedClockPal[];
+extern u8 gBirchBagGrassPal[];
+
+void sub_8146E50(void);
+void sub_8147048(void);
+void sub_8147154(void);
+void sub_81471A4(void);
+void sub_81471EC(void);
+void sub_8147218(void);
+bool8 sub_814737C(u32);
+
+void fullscreen_save_activate(u8 var)
+{
+	SetMainCallback2(sub_8146E50);
+	gUnknown_0203933C = var;
+	gUnknown_0203933E = 0;
+}
+
+void sub_8146E3C(void)
+{
+	LoadOam();
+	ProcessSpriteCopyRequests();
+	TransferPlttBuffer();
+}
+
+void sub_8146E50(void)
+{
+	u16 ime;
+
+	switch(gMain.state)
+	{
+		case 0:
+		default:
+			SetVBlankCallback(0);
+			REG_DISPCNT = 0;
+			REG_BG3CNT = 0;
+			REG_BG2CNT = 0;
+			REG_BG1CNT = 0;
+			REG_BG0CNT = 0;
+			REG_BG3HOFS = 0;
+			REG_BG3VOFS = 0;
+			REG_BG2HOFS = 0;
+			REG_BG2VOFS = 0;
+			REG_BG1HOFS = 0;
+			REG_BG1VOFS = 0;
+			REG_BG0HOFS = 0;
+			REG_BG0VOFS = 0;
+			DmaFill16(3, 0, VRAM, VRAM_SIZE);
+			DmaFill32(3, 0, OAM, OAM_SIZE);
+			DmaFill16(3, 0, PLTT, PLTT_SIZE);
+			LZ77UnCompVram(&gBirchHelpGfx, (void *)VRAM);
+			LZ77UnCompVram(&gBirchBagTilemap, (void *)(VRAM + 0x3000));
+			LZ77UnCompVram(&gBirchGrassTilemap, (void *)(VRAM + 0x3800));
+			LZ77UnCompVram(&gSaveFailedClockGfx, (void *)(VRAM + 0x10020));
+			ResetSpriteData();
+			ResetTasks();
+			ResetPaletteFade();
+			LoadPalette(&gBirchBagGrassPal, 0, 0x40);
+			LoadPalette(&gSaveFailedClockPal, 0x100, 0x20);
+			SetUpWindowConfig(&gWindowConfig_81E6C3C);
+			InitMenuWindow(&gWindowConfig_81E6CE4);
+			// in revision 1.0, the text window is too small, causing text to overflow and create garbage. this is fixed in later revisions.
+#if (REVISION >= 1)
+			MenuDrawTextWindow(13, 6, 16, 9);
+			MenuDrawTextWindow(1, 10, 28, 19);
+			MenuPrint(gSystemText_SaveFailedBackupCheck, 2, 11);
+#else
+			MenuDrawTextWindow(13, 8, 16, 11);
+			MenuDrawTextWindow(1, 12, 28, 19);
+			MenuPrint(gSystemText_SaveFailedBackupCheck, 2, 13);
+#endif
+			BeginNormalPaletteFade(0xFFFFFFFF, 0, 16, 0, 0);
+			ime = REG_IME;
+			REG_IME = 0;
+			REG_IE |= INTR_FLAG_VBLANK;
+			REG_IME = ime;
+			REG_DISPSTAT |= DISPSTAT_VBLANK_INTR;
+			SetVBlankCallback(sub_8146E3C);
+			REG_BG3CNT = 0x703;
+			REG_BG2CNT = 0x602;
+			REG_BG0CNT = 0x1f08;
+			REG_DISPCNT = DISPCNT_OBJ_ON | DISPCNT_BG3_ON | DISPCNT_BG2_ON | DISPCNT_BG0_ON | DISPCNT_OBJ_1D_MAP | DISPCNT_MODE_0;
+			gMain.state++;
+			break;
+		case 1:
+			if(!UpdatePaletteFade())
+			{
+				SetMainCallback2(sub_8147048);
+				SetVBlankCallback(sub_8147218);
+			}
+			break;
+	}
+}
+
+void sub_8147048(void)
+{
+	u8 clockVal = 0;
+
+	gUnknown_0203933E = 1;
+	
+	if(gUnknown_03005EA8)
+	{
+		while(1) // _0814705C
+		{
+			if(!sub_814737C(gUnknown_03005EA8))
+			{
+			#if (REVISION >= 1)
+				MenuDrawTextWindow(1, 10, 28, 19);
+				MenuPrint(gSystemText_CheckCompleteSaveAttempt, 2, 11);
+			#else
+				MenuDrawTextWindow(1, 12, 28, 19);
+				MenuPrint(gSystemText_CheckCompleteSaveAttempt, 2, 13);
+			#endif
+				sub_8125C3C(gUnknown_0203933C);
+			
+				if(gUnknown_03005EA8)
+				#if (REVISION >= 1)
+					MenuPrint(gSystemText_SaveFailedBackupCheck, 2, 11);
+				#else
+					MenuPrint(gSystemText_SaveFailedBackupCheck, 2, 13);
+				#endif
+			
+				clockVal++;
+			
+				if(!gUnknown_03005EA8 || clockVal > 2)
+					break; // go to _081470A6
+
+				continue;
+			}
+			goto gotoLabel2;
+		}
+	}
+	if(clockVal == 3) // _081470A6
+	{
+	#if (REVISION >= 1)
+		MenuDrawTextWindow(1, 10, 28, 19);
+		MenuPrint(gSystemText_BackupDamagedGameContinue, 2, 11);
+	#else
+		MenuDrawTextWindow(1, 12, 28, 19);
+		MenuPrint(gSystemText_BackupDamagedGameContinue, 2, 13);
+	#endif
+		SetMainCallback2(sub_81471A4);
+		goto gotoLabel; // this calls sub_81471A4 for some reason.
+	}
+	else // _081470E4
+	{
+	#if (REVISION >= 1)
+		MenuDrawTextWindow(1, 10, 28, 19);
+	#else
+		MenuDrawTextWindow(1, 12, 28, 19);
+	#endif
+		
+		if(!gUnknown_03005EBC) // cant continue game.
+		{
+		#if (REVISION >= 1)
+			MenuPrint(gSystemText_SaveCompletedGameEnd, 2, 11);
+		#else
+			MenuPrint(gSystemText_SaveCompletedGameEnd, 2, 13);
+		#endif
+			goto gotoLabel;
+		}
+		else // can continue game.
+			goto gotoLabel3;
+	}
+	// no matter what I do, i can't get rid of these gotos. They were seemingly labeled at the end by the developer and jumped to manually depending on the result.
+gotoLabel2: // _0814710C
+#if (REVISION >= 1)
+	MenuDrawTextWindow(1, 10, 28, 19);
+	MenuPrint(gSystemText_BackupDamagedGameContinue, 2, 11);
+#else
+	MenuDrawTextWindow(1, 12, 28, 19);
+	MenuPrint(gSystemText_BackupDamagedGameContinue, 2, 13);
+#endif
+	SetMainCallback2(sub_8147154);
+	return;
+
+gotoLabel3:
+#if (REVISION >= 1)
+	MenuPrint(gSystemText_SaveCompletedPressA, 2, 11);
+#else
+	MenuPrint(gSystemText_SaveCompletedPressA, 2, 13);
+#endif
+
+gotoLabel: // _0814713E
+	SetMainCallback2(sub_81471A4); // seemingly called twice?
+}
+
+void sub_8147154(void)
+{
+	gUnknown_0203933E = 0;
+	
+	if(gMain.newKeys & A_BUTTON)
+	{
+	#if (REVISION >= 1)
+		MenuDrawTextWindow(1, 10, 28, 19);
+		MenuPrint(gSystemText_GameplayEnded, 2, 11);
+	#else
+		MenuDrawTextWindow(1, 12, 28, 19);
+		MenuPrint(gSystemText_GameplayEnded, 2, 13);
+	#endif
+		SetVBlankCallback(sub_8146E3C);
+		SetMainCallback2(sub_81471A4);
+	}
+}
+
+void sub_81471A4(void)
+{
+	u8 zero;
+
+	gUnknown_0203933E = zero = 0;
+	
+	if(gMain.newKeys & A_BUTTON)
+	{
+		BeginNormalPaletteFade(0xFFFFFFFF, 0, zero, 16, 0);
+		SetVBlankCallback(sub_8146E3C);
+		SetMainCallback2(sub_81471EC);
+	}
+}
+
+void sub_81471EC(void)
+{
+	if(!UpdatePaletteFade())
+	{
+		if(!gUnknown_03005EBC)
+			DoSoftReset();
+		else
+		{
+			SetMainCallback2((MainCallback)gUnknown_03005EBC);
+			gUnknown_03005EBC = 0;
+		}
+	}
+}
+
+// do later
+__attribute__((naked))
+void sub_8147218(void)
+{
+	asm(".syntax unified\n\
+	push {r4,r5,lr}\n\
+	ldr r0, _08147290 @ =gMain\n\
+	mov r12, r0\n\
+	ldr r0, [r0, 0x24]\n\
+	lsrs r4, r0, 3\n\
+	movs r0, 0x7\n\
+	ands r4, r0\n\
+	ldr r0, _08147294 @ =gUnknown_08411940\n\
+	ldr r1, [r0, 0x4]\n\
+	ldr r0, [r0]\n\
+	mov r2, r12\n\
+	str r0, [r2, 0x3C]\n\
+	str r1, [r2, 0x40]\n\
+	ldrh r1, [r2, 0x3E]\n\
+	ldr r0, _08147298 @ =0xfffffe00\n\
+	ands r0, r1\n\
+	movs r1, 0x70\n\
+	orrs r0, r1\n\
+	strh r0, [r2, 0x3E]\n\
+	mov r1, r12\n\
+	adds r1, 0x3C\n\
+	@.if REVISION >= 1\n\
+	@movs r0, 0x38\n\
+	@.else\n\
+	movs r0, 0x48\n\
+	@.endif\n\
+	strb r0, [r1]\n\
+	ldr r0, _0814729C @ =gUnknown_0203933E\n\
+	ldrh r0, [r0]\n\
+	cmp r0, 0\n\
+	beq _081472A8\n\
+	ldr r3, _081472A0 @ =gUnknown_08411948\n\
+	lsls r2, r4, 1\n\
+	adds r2, r4\n\
+	adds r0, r2, r3\n\
+	mov r4, r12\n\
+	adds r4, 0x40\n\
+	ldrb r5, [r0]\n\
+	ldrh r1, [r4]\n\
+	ldr r0, _081472A4 @ =0xfffffc00\n\
+	ands r0, r1\n\
+	orrs r0, r5\n\
+	strh r0, [r4]\n\
+	adds r0, r3, 0x2\n\
+	adds r0, r2, r0\n\
+	ldrb r1, [r0]\n\
+	lsls r1, 4\n\
+	adds r3, 0x1\n\
+	adds r2, r3\n\
+	ldrb r0, [r2]\n\
+	lsls r0, 3\n\
+	orrs r1, r0\n\
+	mov r3, r12\n\
+	adds r3, 0x3F\n\
+	movs r0, 0x1F\n\
+	ands r1, r0\n\
+	lsls r1, 1\n\
+	ldrb r2, [r3]\n\
+	movs r0, 0x3F\n\
+	negs r0, r0\n\
+	ands r0, r2\n\
+	orrs r0, r1\n\
+	strb r0, [r3]\n\
+	b _081472B8\n\
+	.align 2, 0\n\
+_08147290: .4byte gMain\n\
+_08147294: .4byte gUnknown_08411940\n\
+_08147298: .4byte 0xfffffe00\n\
+_0814729C: .4byte gUnknown_0203933E\n\
+_081472A0: .4byte gUnknown_08411948\n\
+_081472A4: .4byte 0xfffffc00\n\
+_081472A8:\n\
+	mov r2, r12\n\
+	adds r2, 0x40\n\
+	ldrh r1, [r2]\n\
+	ldr r0, _081472D8 @ =0xfffffc00\n\
+	ands r0, r1\n\
+	movs r1, 0x1\n\
+	orrs r0, r1\n\
+	strh r0, [r2]\n\
+_081472B8:\n\
+	ldr r0, _081472DC @ =gMain + 0x3C\n\
+	movs r1, 0xE0\n\
+	lsls r1, 19\n\
+	movs r2, 0x1\n\
+	bl CpuFastSet\n\
+	ldr r1, _081472E0 @ =gUnknown_0203933E\n\
+	ldrh r0, [r1, 0x2]\n\
+	cmp r0, 0\n\
+	beq _081472D0\n\
+	subs r0, 0x1\n\
+	strh r0, [r1, 0x2]\n\
+_081472D0:\n\
+	pop {r4,r5}\n\
+	pop {r0}\n\
+	bx r0\n\
+	.align 2, 0\n\
+_081472D8: .4byte 0xfffffc00\n\
+_081472DC: .4byte gMain + 0x3C\n\
+_081472E0: .4byte gUnknown_0203933E\n\
+	.syntax divided");
+}
+
+bool8 sub_81472E4(u16 var)
+{
+	u32 *ptr = unk_2000000;
+	u16 i;
+	
+	ReadFlash(var, 0, ptr, 4096);
+
+	for(i = 0; i < 0x400; i++, ptr++)
+		if(*ptr)
+			return TRUE;
+
+	return FALSE;
+}
+
+#ifdef NONMATCHING
+bool8 sub_8147324(u16 arg0) {
+    u16 i2;
+    u16 i;
+    bool8 success;
+
+    i = 0;
+    while (TRUE) {
+        u32 next;
+
+        i2 = 0;
+        next = i + 1;
+
+        for (; i2 < 0x1000; i2++) {
+            ProgramFlashByte(arg0, i2, 0);
+        }
+
+        if (!(success = sub_81472E4(arg0), (i = next)) || i >= 130) // matches except it checks r0 instead of r1. both are the same value, but the compiler prefers r1 for some reason.
+            break;
+    }
+
+    return success;
+}
+#else
+__attribute__((naked))
+bool8 sub_8147324(u16 arg0)
+{
+	asm(".syntax unified\n\
+	push {r4-r7,lr}\n\
+	mov r7, r8\n\
+	push {r7}\n\
+	lsls r0, 16\n\
+	lsrs r6, r0, 16\n\
+	movs r0, 0\n\
+	ldr r1, _08147374 @ =0x00000fff\n\
+	mov r8, r1\n\
+	ldr r7, _08147378 @ =ProgramFlashByte\n\
+_08147336:\n\
+	movs r4, 0\n\
+	adds r5, r0, 0x1\n\
+_0814733A:\n\
+	ldr r3, [r7]\n\
+	adds r0, r6, 0\n\
+	adds r1, r4, 0\n\
+	movs r2, 0\n\
+	bl _call_via_r3\n\
+	adds r0, r4, 0x1\n\
+	lsls r0, 16\n\
+	lsrs r4, r0, 16\n\
+	cmp r4, r8 @ compare i to var.\n\
+	bls _0814733A\n\
+	adds r0, r6, 0\n\
+	bl sub_81472E4\n\
+	lsls r0, 24\n\
+	lsrs r1, r0, 24\n\
+	lsls r0, r5, 16\n\
+	lsrs r0, 16\n\
+	cmp r1, 0\n\
+	beq _08147366\n\
+	cmp r0, 0x81\n\
+	bls _08147336\n\
+_08147366:\n\
+	adds r0, r1, 0 @ add var64 to the result from sub_81472E4(var)?\n\
+	pop {r3}\n\
+	mov r8, r3\n\
+	pop {r4-r7}\n\
+	pop {r1}\n\
+	bx r1\n\
+	.align 2, 0\n\
+_08147374: .4byte 0x00000fff\n\
+_08147378: .4byte ProgramFlashByte\n\
+	.syntax divided");
+}
+#endif
+
+bool8 sub_814737C(u32 var)
+{
+	u16 i;
+	
+	for(i = 0; i < 0x20; i++)
+		if(var & (1 << i) && !sub_8147324(i))
+			var &= ~(1 << i);
+
+	if(var == 0)
+		return FALSE;
+	else
+		return TRUE;
+}
diff --git a/src/starter_choose.c b/src/starter_choose.c
index 341f73e4c..2750705b8 100644
--- a/src/starter_choose.c
+++ b/src/starter_choose.c
@@ -20,12 +20,12 @@ struct MonCoords
 
 extern void * const gUnknown_081FAF4C[];
 extern const u8 gStarterChoose_PokeballCoords[][2];
-extern u8 gUnknown_083F66F0[];
+extern u8 gBirchHelpGfx[];
 extern u8 gBirchBagTilemap[];
 extern u8 gBirchGrassTilemap[];
 extern struct SpriteSheet gUnknown_083F7794;
 extern struct SpriteSheet gUnknown_083F77A4;
-extern u8 gUnknown_083F62EC[];
+extern u8 gBirchBagGrassPal[];
 extern const u8 gStarterChoose_LabelCoords[][2];
 extern u16 gStarterMons[];
 extern union AffineAnimCmd *gUnknown_083F778C[];
@@ -108,7 +108,7 @@ void CB2_ChooseStarter(void)
     DmaFill32(3, 0, OAM, OAM_SIZE);
     DmaFill16(3, 0, PLTT, PLTT_SIZE);
     
-    LZ77UnCompVram(&gUnknown_083F66F0, (void *)VRAM);
+    LZ77UnCompVram(&gBirchHelpGfx, (void *)VRAM);
     LZ77UnCompVram(&gBirchBagTilemap, (void *)(VRAM + 0x3000));
     LZ77UnCompVram(&gBirchGrassTilemap, (void *)(VRAM + 0x3800));
     remove_some_task();
@@ -116,7 +116,7 @@ void CB2_ChooseStarter(void)
     ResetSpriteData();
     ResetPaletteFade();
     FreeAllSpritePalettes();
-    LoadPalette(gUnknown_083F62EC, 0, 0x40);
+    LoadPalette(gBirchBagGrassPal, 0, 0x40);
     LoadCompressedObjectPic(&gUnknown_083F7794);
     LoadCompressedObjectPic(&gUnknown_083F77A4);
     LoadSpritePalettes(gUnknown_083F77B4);