checkpoint

6 files changed, 342 insertions, 575 deletions

diff --git a/asm/shop.s b/asm/shop.s
index 57ebe9747..56658c4ff 100644
--- a/asm/shop.s
+++ b/asm/shop.s
@@ -5,561 +5,6 @@
 
 	.text
 
-	thumb_func_start BuyMenuAddScrollIndicatorArrows
-@ void BuyMenuAddScrollIndicatorArrows()
-BuyMenuAddScrollIndicatorArrows: @ 80E01C8
-	push {r4,r5,lr}
-	sub sp, 0x10
-	ldr r5, =gShopDataPtr
-	ldr r2, [r5]
-	ldr r4, =0x0000200b
-	adds r0, r2, r4
-	ldrb r0, [r0]
-	cmp r0, 0xFF
-	bne _080E0206
-	ldr r0, =gMartInfo
-	ldrh r1, [r0, 0xC]
-	adds r0, r1, 0x1
-	cmp r0, 0x8
-	ble _080E0206
-	subs r0, r1, 0x7
-	str r0, [sp]
-	ldr r0, =0x00000834
-	str r0, [sp, 0x4]
-	str r0, [sp, 0x8]
-	ldr r1, =0x00002008
-	adds r0, r2, r1
-	str r0, [sp, 0xC]
-	movs r0, 0x2
-	movs r1, 0xAC
-	movs r2, 0xC
-	movs r3, 0x94
-	bl AddScrollIndicatorArrowPairParameterized
-	ldr r1, [r5]
-	adds r1, r4
-	strb r0, [r1]
-_080E0206:
-	add sp, 0x10
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuAddScrollIndicatorArrows
-
-	thumb_func_start BuyMenuRemoveScrollIndicatorArrows
-@ void BuyMenuRemoveScrollIndicatorArrows()
-BuyMenuRemoveScrollIndicatorArrows: @ 80E0224
-	push {r4,lr}
-	ldr r4, =gShopDataPtr
-	ldr r0, [r4]
-	ldr r2, =0x0000200b
-	adds r1, r0, r2
-	ldrb r0, [r1]
-	cmp r0, 0xFF
-	beq _080E0242
-	bl RemoveScrollIndicatorArrowPair
-	ldr r0, [r4]
-	ldr r1, =0x0000200b
-	adds r0, r1
-	movs r1, 0xFF
-	strb r1, [r0]
-_080E0242:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuRemoveScrollIndicatorArrows
-
-	thumb_func_start BuyMenuPrintCursor
-@ void BuyMenuPrintCursor(u8 taskId, u8 colorSetId)
-BuyMenuPrintCursor: @ 80E0250
-	push {r4,lr}
-	sub sp, 0x8
-	adds r4, r1, 0
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r4, 24
-	lsrs r4, 24
-	bl ListMenuGetYCoordForPrintingArrowCursor
-	adds r3, r0, 0
-	lsls r3, 24
-	lsrs r3, 24
-	ldr r1, =gText_SelectorArrow2
-	movs r0, 0
-	str r0, [sp]
-	str r4, [sp, 0x4]
-	movs r0, 0x1
-	movs r2, 0
-	bl BuyMenuPrint
-	add sp, 0x8
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuPrintCursor
-
-	thumb_func_start BuyMenuAddItemIcon
-@ void BuyMenuAddItemIcon(u16 id, u8 iconSlot)
-BuyMenuAddItemIcon: @ 80E0284
-	push {r4,lr}
-	sub sp, 0x8
-	lsls r0, 16
-	lsrs r2, r0, 16
-	lsls r1, 24
-	lsrs r3, r1, 24
-	ldr r0, =gShopDataPtr
-	ldr r4, =0x0000200d
-	adds r1, r3, r4
-	ldr r0, [r0]
-	adds r4, r0, r1
-	ldrb r0, [r4]
-	cmp r0, 0xFF
-	bne _080E0310
-	ldr r0, =gMartInfo
-	ldrb r0, [r0, 0xF]
-	cmp r0, 0
-	beq _080E02AE
-	ldr r0, =0x0000ffff
-	cmp r2, r0
-	bne _080E02F0
-_080E02AE:
-	ldr r0, =0x0000083e
-	adds r1, r3, r0
-	adds r0, r1, 0
-	bl AddItemIconSprite
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0x40
-	beq _080E0310
-	strb r2, [r4]
-	ldr r1, =gSprites
-	lsls r0, r2, 4
-	adds r0, r2
-	lsls r0, 2
-	adds r0, r1
-	movs r1, 0x18
-	strh r1, [r0, 0x24]
-	movs r1, 0x58
-	strh r1, [r0, 0x26]
-	b _080E0310
-	.pool
-_080E02F0:
-	lsls r0, r2, 24
-	lsrs r0, 24
-	ldr r2, =0x0000083e
-	adds r1, r3, r2
-	str r1, [sp]
-	str r1, [sp, 0x4]
-	movs r1, 0x14
-	movs r2, 0x54
-	movs r3, 0x1
-	bl AddDecorationIconObject
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0x40
-	beq _080E0310
-	strb r2, [r4]
-_080E0310:
-	add sp, 0x8
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuAddItemIcon
-
-	thumb_func_start BuyMenuRemoveItemIcon
-@ void BuyMenuRemoveItemIcon(u16 id, u8 iconSlot)
-BuyMenuRemoveItemIcon: @ 80E031C
-	push {r4,r5,lr}
-	lsls r1, 24
-	lsrs r4, r1, 24
-	ldr r0, =gShopDataPtr
-	ldr r2, =0x0000200d
-	adds r1, r4, r2
-	ldr r0, [r0]
-	adds r5, r0, r1
-	ldrb r0, [r5]
-	cmp r0, 0xFF
-	beq _080E0356
-	ldr r0, =0x0000083e
-	adds r4, r0
-	adds r0, r4, 0
-	bl FreeSpriteTilesByTag
-	adds r0, r4, 0
-	bl FreeSpritePaletteByTag
-	ldrb r1, [r5]
-	lsls r0, r1, 4
-	adds r0, r1
-	lsls r0, 2
-	ldr r1, =gSprites
-	adds r0, r1
-	bl DestroySprite
-	movs r0, 0xFF
-	strb r0, [r5]
-_080E0356:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuRemoveItemIcon
-
-	thumb_func_start BuyMenuInitBgs
-@ void BuyMenuInitBgs()
-BuyMenuInitBgs: @ 80E036C
-	push {r4,lr}
-	movs r0, 0
-	bl ResetBgsAndClearDma3BusyFlags
-	ldr r1, =gUnknown_08589A60
-	movs r0, 0
-	movs r2, 0x4
-	bl InitBgsFromTemplates
-	ldr r4, =gShopDataPtr
-	ldr r1, [r4]
-	movs r0, 0x80
-	lsls r0, 4
-	adds r1, r0
-	movs r0, 0x1
-	bl SetBgTilemapBuffer
-	ldr r1, [r4]
-	movs r0, 0xC0
-	lsls r0, 5
-	adds r1, r0
-	movs r0, 0x2
-	bl SetBgTilemapBuffer
-	ldr r1, [r4]
-	movs r0, 0x80
-	lsls r0, 5
-	adds r1, r0
-	movs r0, 0x3
-	bl SetBgTilemapBuffer
-	movs r0, 0x10
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x12
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x14
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x16
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x18
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1A
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1C
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1E
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x50
-	movs r1, 0
-	bl SetGpuReg
-	movs r1, 0x82
-	lsls r1, 5
-	movs r0, 0
-	bl SetGpuReg
-	movs r0, 0
-	bl ShowBg
-	movs r0, 0x1
-	bl ShowBg
-	movs r0, 0x2
-	bl ShowBg
-	movs r0, 0x3
-	bl ShowBg
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuInitBgs
-
-	thumb_func_start BuyMenuDecompressBgGraphics
-@ void BuyMenuDecompressBgGraphics()
-BuyMenuDecompressBgGraphics: @ 80E0424
-	push {lr}
-	sub sp, 0x4
-	ldr r1, =gBuyMenuFrame_Gfx
-	movs r2, 0xE8
-	lsls r2, 2
-	ldr r3, =0x000003e3
-	movs r0, 0
-	str r0, [sp]
-	movs r0, 0x1
-	bl decompress_and_copy_tile_data_to_vram
-	ldr r0, =gBuyMenuFrame_Tilemap
-	ldr r1, =gShopDataPtr
-	ldr r1, [r1]
-	bl LZDecompressWram
-	ldr r0, =gMenuMoneyPal
-	movs r1, 0xC0
-	movs r2, 0x20
-	bl LoadCompressedPalette
-	add sp, 0x4
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuDecompressBgGraphics
-
-	thumb_func_start BuyMenuInitWindows
-@ void BuyMenuInitWindows()
-BuyMenuInitWindows: @ 80E0468
-	push {lr}
-	ldr r0, =gUnknown_08589A70
-	bl InitWindows
-	bl DeactivateAllTextPrinters
-	movs r0, 0
-	movs r1, 0x1
-	movs r2, 0xD0
-	bl LoadUserWindowBorderGfx
-	movs r0, 0
-	movs r1, 0xA
-	movs r2, 0xE0
-	bl LoadMessageBoxGfx
-	movs r0, 0
-	bl PutWindowTilemap
-	movs r0, 0x1
-	bl PutWindowTilemap
-	movs r0, 0x2
-	bl PutWindowTilemap
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuInitWindows
-
-	thumb_func_start BuyMenuPrint
-@ void BuyMenuPrint(u8 windowId, u8 *str, u8 x, u8 y, u8 speed, u8 colorSetId)
-BuyMenuPrint: @ 80E04A4
-	push {r4-r6,lr}
-	sub sp, 0x14
-	ldr r6, [sp, 0x24]
-	ldr r5, [sp, 0x28]
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r2, 24
-	lsrs r2, 24
-	lsls r3, 24
-	lsrs r3, 24
-	lsls r5, 24
-	lsrs r5, 24
-	movs r4, 0
-	str r4, [sp]
-	str r4, [sp, 0x4]
-	lsls r4, r5, 1
-	adds r4, r5
-	ldr r5, =gUnknown_08589AB0
-	adds r4, r5
-	str r4, [sp, 0x8]
-	lsls r6, 24
-	asrs r6, 24
-	str r6, [sp, 0xC]
-	str r1, [sp, 0x10]
-	movs r1, 0x1
-	bl AddTextPrinterParameterized2
-	add sp, 0x14
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuPrint
-
-	thumb_func_start BuyMenuDisplayMessage
-@ void BuyMenuDisplayMessage(u8 taskId, u8 *str, void ( *callback)(u8 taskId))
-BuyMenuDisplayMessage: @ 80E04E8
-	push {r4-r6,lr}
-	sub sp, 0x10
-	adds r4, r0, 0
-	adds r5, r1, 0
-	adds r6, r2, 0
-	lsls r4, 24
-	lsrs r4, 24
-	bl GetPlayerTextSpeed
-	lsls r0, 24
-	lsrs r0, 24
-	movs r1, 0x1
-	str r1, [sp]
-	str r0, [sp, 0x4]
-	str r5, [sp, 0x8]
-	str r6, [sp, 0xC]
-	adds r0, r4, 0
-	movs r1, 0x5
-	movs r2, 0xA
-	movs r3, 0xE
-	bl DisplayMessageAndContinueTask
-	movs r0, 0
-	bl schedule_bg_copy_tilemap_to_vram
-	add sp, 0x10
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end BuyMenuDisplayMessage
-
-	thumb_func_start BuyMenuDrawGraphics
-@ void BuyMenuDrawGraphics()
-BuyMenuDrawGraphics: @ 80E0524
-	push {lr}
-	bl BuyMenuDrawMapGraphics
-	bl BuyMenuCopyMenuBgToBg1TilemapBuffer
-	movs r0, 0x13
-	movs r1, 0xB
-	bl AddMoneyLabelObject
-	ldr r0, =gSaveBlock1Ptr
-	ldr r0, [r0]
-	movs r1, 0x92
-	lsls r1, 3
-	adds r0, r1
-	bl GetMoney
-	adds r3, r0, 0
-	movs r0, 0
-	movs r1, 0x1
-	movs r2, 0xD
-	bl PrintMoneyAmountInMoneyBoxWithBorder
-	movs r0, 0
-	bl schedule_bg_copy_tilemap_to_vram
-	movs r0, 0x1
-	bl schedule_bg_copy_tilemap_to_vram
-	movs r0, 0x2
-	bl schedule_bg_copy_tilemap_to_vram
-	movs r0, 0x3
-	bl schedule_bg_copy_tilemap_to_vram
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuDrawGraphics
-
-	thumb_func_start BuyMenuDrawMapGraphics
-@ void BuyMenuDrawMapGraphics()
-BuyMenuDrawMapGraphics: @ 80E0570
-	push {lr}
-	bl BuyMenuCollectEventObjectData
-	bl BuyMenuDrawEventObjects
-	bl BuyMenuDrawMapBg
-	pop {r0}
-	bx r0
-	thumb_func_end BuyMenuDrawMapGraphics
-
-	thumb_func_start BuyMenuDrawMapBg
-@ void BuyMenuDrawMapBg()
-BuyMenuDrawMapBg: @ 80E0584
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x4
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	mov r9, r0
-	mov r4, sp
-	adds r4, 0x2
-	mov r0, sp
-	adds r1, r4, 0
-	bl GetXYCoordsOneStepInFrontOfPlayer
-	mov r1, sp
-	mov r0, sp
-	ldrh r0, [r0]
-	subs r0, 0x4
-	strh r0, [r1]
-	ldrh r0, [r4]
-	subs r0, 0x4
-	strh r0, [r4]
-	movs r1, 0
-	mov r10, r4
-_080E05B6:
-	movs r4, 0
-	lsls r7, r1, 16
-	asrs r0, r7, 16
-	mov r8, r0
-_080E05BE:
-	mov r0, sp
-	movs r1, 0
-	ldrsh r0, [r0, r1]
-	lsls r4, 16
-	asrs r5, r4, 16
-	adds r0, r5
-	mov r2, r10
-	movs r3, 0
-	ldrsh r1, [r2, r3]
-	add r1, r8
-	bl MapGridGetMetatileIdAt
-	lsls r0, 16
-	lsrs r6, r0, 16
-	adds r0, r5, 0
-	mov r1, r8
-	bl BuyMenuCheckForOverlapWithMenuBg
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	bne _080E0608
-	mov r0, sp
-	movs r1, 0
-	ldrsh r0, [r0, r1]
-	adds r0, r5
-	mov r2, r10
-	movs r3, 0
-	ldrsh r1, [r2, r3]
-	add r1, r8
-	bl MapGridGetMetatileLayerTypeAt
-	lsls r0, 24
-	lsrs r5, r0, 24
-	b _080E060A
-	.pool
-_080E0608:
-	movs r5, 0x1
-_080E060A:
-	ldr r0, =0x000001ff
-	cmp r6, r0
-	bhi _080E062C
-	asrs r0, r4, 16
-	mov r2, r9
-	ldr r1, [r2, 0x10]
-	lsls r3, r6, 4
-	ldr r2, [r1, 0xC]
-	adds r2, r3
-	asrs r1, r7, 16
-	adds r3, r5, 0
-	bl BuyMenuDrawMapMetatile
-	b _080E0644
-	.pool
-_080E062C:
-	asrs r0, r4, 16
-	mov r3, r9
-	ldr r2, [r3, 0x14]
-	ldr r3, =0xfffffe00
-	adds r1, r6, r3
-	lsls r1, 4
-	ldr r2, [r2, 0xC]
-	adds r2, r1
-	asrs r1, r7, 16
-	adds r3, r5, 0
-	bl BuyMenuDrawMapMetatile
-_080E0644:
-	movs r1, 0x80
-	lsls r1, 9
-	adds r0, r4, r1
-	lsrs r4, r0, 16
-	asrs r0, 16
-	cmp r0, 0xE
-	ble _080E05BE
-	adds r0, r7, r1
-	lsrs r1, r0, 16
-	asrs r0, 16
-	cmp r0, 0x9
-	ble _080E05B6
-	add sp, 0x4
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end BuyMenuDrawMapBg
-
 	thumb_func_start BuyMenuDrawMapMetatile
 @ void BuyMenuDrawMapMetatile(u16 x, u16 y, u16 *src, u8 metatileLayerType)
 BuyMenuDrawMapMetatile: @ 80E0670
diff --git a/data/shop.s b/data/shop.s
index 58f294e6b..45ecbb585 100644
--- a/data/shop.s
+++ b/data/shop.s
@@ -53,9 +53,10 @@ gUnknown_08589AA8:: @ 8589AA8
 
 gUnknown_08589AB0:: @ 8589AB0
 	.byte 1, 2, 3
+	.byte 0, 2, 3
+	.byte 0, 3, 2
 
-gUnknown_08589AB3:: @ 8589AB3
-	.byte 0, 2, 3, 0, 3, 2, 0
+	.align 1
 
 gUnknown_08589ABA:: @ 8589ABA
 	.2byte 0x284, 0x282, 0x280
diff --git a/include/battle_pyramid_bag.h b/include/battle_pyramid_bag.h
index 5d5d8ccfa..2301b0aa0 100644
--- a/include/battle_pyramid_bag.h
+++ b/include/battle_pyramid_bag.h
@@ -11,7 +11,7 @@ struct PyramidBagResources
     u8 windowIds[5];
     u8 unk814;
     u8 unk815;
-    u8 scrollArrowSpriteId;
+    u8 scrollIndicatorsTaskId;
     const u8 *menuActionIds;
     u8 filler81C[0x820 - 0x81C];
     u8 menuActionsCount;
diff --git a/include/shop.h b/include/shop.h
index d7822ec31..067b8fee4 100644
--- a/include/shop.h
+++ b/include/shop.h
@@ -27,13 +27,15 @@ struct BuyMenuLabel
 
 struct ShopData
 {
-	/*0x0000*/ u8 filler0[0x2004];
+	/*0x0000*/ u8 tilemapBuffers[4][0x800];
+	/*0x2000*/ u8 filler2000[0x4];
 	/*0x2004*/ u16 unk2004;
-	/*0x2006*/ u8 filler2006[0x5];
-	/*0x200B*/ u8 unk200B;
+	/*0x2006*/ u8 filler2006[0x2];
+	/*0x2008*/ u16 unk2008;
+	/*0x200A*/ u8 filler200A;
+	/*0x200B*/ u8 scrollIndicatorsTaskId;
 	/*0x200C*/ u8 unk200C;
-	/*0x200D*/ s8 unk200D;
-	/*0x200E*/ s8 unk200E;
+	/*0x200D*/ u8 unk200D[2];
 	/*0x200F*/ u8 filler200F[0xA1];
 };
 
diff --git a/src/battle_pyramid_bag.c b/src/battle_pyramid_bag.c
index 8a5ce7a99..46ba50792 100644
--- a/src/battle_pyramid_bag.c
+++ b/src/battle_pyramid_bag.c
@@ -264,7 +264,7 @@ void sub_81C4F98(u8 a0, void (*callback)(void))
 
     gPyramidBagResources->callback2 = NULL;
     gPyramidBagResources->unk814 = 0xFF;
-    gPyramidBagResources->scrollArrowSpriteId = 0xFF;
+    gPyramidBagResources->scrollIndicatorsTaskId = 0xFF;
 
     memset(gPyramidBagResources->itemsSpriteIds, 0xFF, sizeof(gPyramidBagResources->itemsSpriteIds));
     memset(gPyramidBagResources->windowIds, 0xFF, sizeof(gPyramidBagResources->windowIds));
@@ -532,16 +532,16 @@ static void PrintItemDescription(s32 listMenuId)
 
 static void AddScrollArrow(void)
 {
-    if (gPyramidBagResources->scrollArrowSpriteId == 0xFF)
-        gPyramidBagResources->scrollArrowSpriteId = AddScrollIndicatorArrowPairParameterized(2, 172, 12, 148, gPyramidBagResources->listMenuCount - gPyramidBagResources->listMenuMaxShown, 0xB5E, 0xB5E, &gPyramidBagCursorData.scrollPosition);
+    if (gPyramidBagResources->scrollIndicatorsTaskId == 0xFF)
+        gPyramidBagResources->scrollIndicatorsTaskId = AddScrollIndicatorArrowPairParameterized(2, 172, 12, 148, gPyramidBagResources->listMenuCount - gPyramidBagResources->listMenuMaxShown, 0xB5E, 0xB5E, &gPyramidBagCursorData.scrollPosition);
 }
 
 static void RemoveScrollArrow(void)
 {
-    if (gPyramidBagResources->scrollArrowSpriteId != 0xFF)
+    if (gPyramidBagResources->scrollIndicatorsTaskId != 0xFF)
     {
-        RemoveScrollIndicatorArrowPair(gPyramidBagResources->scrollArrowSpriteId);
-        gPyramidBagResources->scrollArrowSpriteId = 0xFF;
+        RemoveScrollIndicatorArrowPair(gPyramidBagResources->scrollIndicatorsTaskId);
+        gPyramidBagResources->scrollIndicatorsTaskId = 0xFF;
     }
 }
 
diff --git a/src/shop.c b/src/shop.c
index 5dc85859b..2f7126dc6 100755
--- a/src/shop.c
+++ b/src/shop.c
@@ -1,23 +1,31 @@
 #include "global.h"
 #include "bg.h"
+#include "decompress.h"
 #include "decoration.h"
+#include "field_player_avatar.h"
 #include "field_screen.h"
 #include "field_weather.h"
+#include "fieldmap.h"
+#include "gpu_regs.h"
 #include "international_string_util.h"
 #include "item.h"
+#include "item_icon.h"
 #include "list_menu.h"
 #include "main.h"
 #include "malloc.h"
 #include "menu.h"
 #include "menu_helpers.h"
+#include "money.h"
 #include "overworld.h"
 #include "palette.h"
 #include "scanline_effect.h"
 #include "script.h"
 #include "shop.h"
 #include "sound.h"
+#include "sprite.h"
 #include "string_util.h"
 #include "strings.h"
+#include "text_window.h"
 #include "tv.h"
 #include "constants/rgb.h"
 #include "constants/songs.h"
@@ -31,7 +39,12 @@ extern const struct WindowTemplate gUnknown_08589A38[2];
 extern const struct MenuAction gUnknown_08589A10[3];
 extern const struct MenuAction gUnknown_08589A28[2];
 extern const struct ListMenuTemplate gUnknown_08589A48;
-extern const u8 gUnknown_08589AB3[];
+extern const struct BgTemplate gUnknown_08589A60[4];
+extern const u8 gBuyMenuFrame_Gfx[];
+extern const u8 gBuyMenuFrame_Tilemap[];
+extern const u16 gMenuMoneyPal[];
+extern const struct WindowTemplate gUnknown_08589A70[];
+extern u8 gUnknown_08589AB0[][3];
 
 static void Task_ShopMenu(u8 taskId);
 void HandleShopMenuQuit(u8 taskId);
@@ -51,7 +64,14 @@ void BuyMenuDecompressBgGraphics(void);
 void BuyMenuSetListEntry(struct ListMenuItem*, u16, u8*);
 void BuyMenuAddItemIcon(u16, u8);
 void BuyMenuRemoveItemIcon(u16, u8);
-void BuyMenuPrint(u8, const u8*, u8, u8, u8, u8);
+void BuyMenuPrint(u8 windowId, const u8 *text, u8 x, u8 y, s8 speed, u8 colorSet);
+void BuyMenuDrawMapGraphics(void);
+void BuyMenuCopyMenuBgToBg1TilemapBuffer(void);
+void BuyMenuCollectEventObjectData(void);
+void BuyMenuDrawEventObjects(void);
+void BuyMenuDrawMapBg(void);
+bool8 BuyMenuCheckForOverlapWithMenuBg(u16, u16);
+void BuyMenuDrawMapMetatile(s16, s16, u16*, u8);
 
 
 /*static*/ u8 CreateShopMenu(u8 martType)
@@ -227,9 +247,9 @@ void CB2_InitBuyMenu(void)
         ResetTasks();
         clear_scheduled_bg_copies_to_vram();
         gShopDataPtr = AllocZeroed(sizeof(struct ShopData));
-        gShopDataPtr->unk200B = 0xFF;
-        gShopDataPtr->unk200D = -1;
-        gShopDataPtr->unk200E = -1;
+        gShopDataPtr->scrollIndicatorsTaskId = 0xFF;
+        gShopDataPtr->unk200D[0] = -1;
+        gShopDataPtr->unk200D[1] = -1;
         BuyMenuBuildListMenuTemplate();
         BuyMenuInitBgs();
         FillBgTilemapBufferRect_Palette0(0, 0, 0, 0, 0x20, 0x20);
@@ -355,6 +375,305 @@ void BuyMenuPrintPriceInList(u8 windowId, int item, u8 y)
 
         StringExpandPlaceholders(gStringVar4, gText_PokedollarVar1);
         x = GetStringRightAlignXOffset(7, gStringVar4, 0x78);
-        AddTextPrinterParameterized2(windowId, 7, x, y, 0, 0, gUnknown_08589AB3, -1, gStringVar4);
+        AddTextPrinterParameterized2(windowId, 7, x, y, 0, 0, gUnknown_08589AB0[1], -1, gStringVar4);
     }
 }
+
+void BuyMenuAddScrollIndicatorArrows(void)
+{
+    if (gShopDataPtr->scrollIndicatorsTaskId == 0xFF && gMartInfo.itemCount + 1 > 8)
+    {
+        gShopDataPtr->scrollIndicatorsTaskId = AddScrollIndicatorArrowPairParameterized(
+            SCROLL_ARROW_UP,
+            0xAC,
+            0xC,
+            0x94,
+            gMartInfo.itemCount - 7,
+            0x834,
+            0x834,
+            &gShopDataPtr->unk2008);
+    }
+}
+
+void BuyMenuRemoveScrollIndicatorArrows(void)
+{
+    if (gShopDataPtr->scrollIndicatorsTaskId != 0xFF)
+    {
+        RemoveScrollIndicatorArrowPair(gShopDataPtr->scrollIndicatorsTaskId);
+        gShopDataPtr->scrollIndicatorsTaskId = 0xFF;
+    }
+}
+
+void BuyMenuPrintCursor(u8 scrollIndicatorsTaskId, u8 colorSet)
+{
+    u8 y = ListMenuGetYCoordForPrintingArrowCursor(scrollIndicatorsTaskId);
+    BuyMenuPrint(1, gText_SelectorArrow2, 0, y, 0, colorSet);
+}
+
+void BuyMenuAddItemIcon(u16 item, u8 iconSlot)
+{
+    u8 spriteId;
+    u8 *spriteIdPtr = &gShopDataPtr->unk200D[iconSlot];
+    if (*spriteIdPtr != 0xFF)
+        return;
+
+    if (gMartInfo.martType == MART_TYPE_0 || item == 0xFFFF)
+    {
+        spriteId = AddItemIconSprite(iconSlot + 0x83E, iconSlot + 0x83E, item);
+        if (spriteId != MAX_SPRITES)
+        {
+            *spriteIdPtr = spriteId;
+            gSprites[spriteId].pos2.x = 24;
+            gSprites[spriteId].pos2.y = 88;
+        }
+    }
+    else
+    {
+        spriteId = AddDecorationIconObject(item, 20, 84, 1, iconSlot + 0x83E, iconSlot + 0x83E);
+        if (spriteId != MAX_SPRITES)
+            *spriteIdPtr = spriteId;
+    }
+}
+
+void BuyMenuRemoveItemIcon(u16 item, u8 iconSlot)
+{
+    u8 *spriteIdPtr = &gShopDataPtr->unk200D[iconSlot];
+    if (*spriteIdPtr == 0xFF)
+        return;
+
+    FreeSpriteTilesByTag(iconSlot + 0x83E);
+    FreeSpritePaletteByTag(iconSlot + 0x83E);
+    DestroySprite(&gSprites[*spriteIdPtr]);
+    *spriteIdPtr = 0xFF;
+}
+
+void BuyMenuInitBgs(void)
+{
+    ResetBgsAndClearDma3BusyFlags(0);
+    InitBgsFromTemplates(0, gUnknown_08589A60, ARRAY_COUNT(gUnknown_08589A60));
+    SetBgTilemapBuffer(1, gShopDataPtr->tilemapBuffers[1]);
+    SetBgTilemapBuffer(2, gShopDataPtr->tilemapBuffers[3]);
+    SetBgTilemapBuffer(3, gShopDataPtr->tilemapBuffers[2]);
+    SetGpuReg(REG_OFFSET_BG0HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG0VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG1HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG1VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG2HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG2VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG3HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG3VOFS, 0);
+    SetGpuReg(REG_OFFSET_BLDCNT, 0);
+    SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_MODE_0 | DISPCNT_OBJ_ON | DISPCNT_OBJ_1D_MAP);
+    ShowBg(0);
+    ShowBg(1);
+    ShowBg(2);
+    ShowBg(3);
+}
+
+void BuyMenuDecompressBgGraphics(void)
+{
+    decompress_and_copy_tile_data_to_vram(1, gBuyMenuFrame_Gfx, 0x3A0, 0x3E3, 0);
+    LZDecompressWram(gBuyMenuFrame_Tilemap, gShopDataPtr->tilemapBuffers[0]);
+    LoadCompressedPalette(gMenuMoneyPal, 0xC0, 0x20);
+}
+
+void BuyMenuInitWindows(void)
+{
+    InitWindows(gUnknown_08589A70);
+    DeactivateAllTextPrinters();
+    LoadUserWindowBorderGfx(0, 1, 0xD0);
+    LoadMessageBoxGfx(0, 0xA, 0xE0);
+    PutWindowTilemap(0);
+    PutWindowTilemap(1);
+    PutWindowTilemap(2);
+}
+
+void BuyMenuPrint(u8 windowId, const u8 *text, u8 x, u8 y, s8 speed, u8 colorSet)
+{
+    AddTextPrinterParameterized2(windowId, 1, x, y, 0, 0, gUnknown_08589AB0[colorSet], speed, text);
+}
+
+void BuyMenuDisplayMessage(u8 taskId, const u8 *text, TaskFunc callback)
+{
+    DisplayMessageAndContinueTask(taskId, 5, 10, 14, 1, GetPlayerTextSpeed(), text, callback);
+    schedule_bg_copy_tilemap_to_vram(0);
+}
+
+void BuyMenuDrawGraphics(void)
+{
+    BuyMenuDrawMapGraphics();
+    BuyMenuCopyMenuBgToBg1TilemapBuffer();
+    AddMoneyLabelObject(19, 11);
+    PrintMoneyAmountInMoneyBoxWithBorder(0, 1, 13, GetMoney(&gSaveBlock1Ptr->money));
+    schedule_bg_copy_tilemap_to_vram(0);
+    schedule_bg_copy_tilemap_to_vram(1);
+    schedule_bg_copy_tilemap_to_vram(2);
+    schedule_bg_copy_tilemap_to_vram(3);
+}
+
+void BuyMenuDrawMapGraphics(void)
+{
+    BuyMenuCollectEventObjectData();
+    BuyMenuDrawEventObjects();
+    BuyMenuDrawMapBg();
+}
+
+#ifdef NONMATCHING
+// functionally equivalent, but couldn't get the loop variables using the 
+// stack correctly. Might be related to the tileset metatiles type.
+void BuyMenuDrawMapBg(void)
+{
+    s16 i;
+    s16 j;
+    s16 x;
+    s16 y;
+    const struct MapLayout *mapLayout;
+    u16 metatile, metatileLayerType;
+
+    mapLayout = gMapHeader.mapLayout;
+    GetXYCoordsOneStepInFrontOfPlayer(&x, &y);
+    x -= 4;
+    y -= 4;
+
+    for (j = 0; j < 10; j++)
+    {
+        for (i = 0; i < 15; i++)
+        {
+            metatile = MapGridGetMetatileIdAt(x + i, y + j);
+            if (BuyMenuCheckForOverlapWithMenuBg(i, j) == TRUE)
+                metatileLayerType = MapGridGetMetatileLayerTypeAt(x + i, y + j);
+            else
+                metatileLayerType = 1;
+
+            if (metatile < 0x200)
+            {
+                BuyMenuDrawMapMetatile(i, j, (u16*)mapLayout->primaryTileset->metatiles + metatile * 8, metatileLayerType);
+            }
+            else
+            {
+                BuyMenuDrawMapMetatile(i, j, (u16*)mapLayout->secondaryTileset->metatiles + ((metatile - 0x200) * 8), metatileLayerType);
+            }
+        }
+    }
+}
+#else
+NAKED
+void BuyMenuDrawMapBg(void)
+{
+    asm_unified("\n\
+    push {r4-r7,lr}\n\
+    mov r7, r10\n\
+    mov r6, r9\n\
+    mov r5, r8\n\
+    push {r5-r7}\n\
+    sub sp, 0x4\n\
+    ldr r0, =gMapHeader\n\
+    ldr r0, [r0]\n\
+    mov r9, r0\n\
+    mov r4, sp\n\
+    adds r4, 0x2\n\
+    mov r0, sp\n\
+    adds r1, r4, 0\n\
+    bl GetXYCoordsOneStepInFrontOfPlayer\n\
+    mov r1, sp\n\
+    mov r0, sp\n\
+    ldrh r0, [r0]\n\
+    subs r0, 0x4\n\
+    strh r0, [r1]\n\
+    ldrh r0, [r4]\n\
+    subs r0, 0x4\n\
+    strh r0, [r4]\n\
+    movs r1, 0\n\
+    mov r10, r4\n\
+_080E05B6:\n\
+    movs r4, 0\n\
+    lsls r7, r1, 16\n\
+    asrs r0, r7, 16\n\
+    mov r8, r0\n\
+_080E05BE:\n\
+    mov r0, sp\n\
+    movs r1, 0\n\
+    ldrsh r0, [r0, r1]\n\
+    lsls r4, 16\n\
+    asrs r5, r4, 16\n\
+    adds r0, r5\n\
+    mov r2, r10\n\
+    movs r3, 0\n\
+    ldrsh r1, [r2, r3]\n\
+    add r1, r8\n\
+    bl MapGridGetMetatileIdAt\n\
+    lsls r0, 16\n\
+    lsrs r6, r0, 16\n\
+    adds r0, r5, 0\n\
+    mov r1, r8\n\
+    bl BuyMenuCheckForOverlapWithMenuBg\n\
+    lsls r0, 24\n\
+    lsrs r0, 24\n\
+    cmp r0, 0x1\n\
+    bne _080E0608\n\
+    mov r0, sp\n\
+    movs r1, 0\n\
+    ldrsh r0, [r0, r1]\n\
+    adds r0, r5\n\
+    mov r2, r10\n\
+    movs r3, 0\n\
+    ldrsh r1, [r2, r3]\n\
+    add r1, r8\n\
+    bl MapGridGetMetatileLayerTypeAt\n\
+    lsls r0, 24\n\
+    lsrs r5, r0, 24\n\
+    b _080E060A\n\
+    .pool\n\
+_080E0608:\n\
+    movs r5, 0x1\n\
+_080E060A:\n\
+    ldr r0, =0x000001ff\n\
+    cmp r6, r0\n\
+    bhi _080E062C\n\
+    asrs r0, r4, 16\n\
+    mov r2, r9\n\
+    ldr r1, [r2, 0x10]\n\
+    lsls r3, r6, 4\n\
+    ldr r2, [r1, 0xC]\n\
+    adds r2, r3\n\
+    asrs r1, r7, 16\n\
+    adds r3, r5, 0\n\
+    bl BuyMenuDrawMapMetatile\n\
+    b _080E0644\n\
+    .pool\n\
+_080E062C:\n\
+    asrs r0, r4, 16\n\
+    mov r3, r9\n\
+    ldr r2, [r3, 0x14]\n\
+    ldr r3, =0xfffffe00\n\
+    adds r1, r6, r3\n\
+    lsls r1, 4\n\
+    ldr r2, [r2, 0xC]\n\
+    adds r2, r1\n\
+    asrs r1, r7, 16\n\
+    adds r3, r5, 0\n\
+    bl BuyMenuDrawMapMetatile\n\
+_080E0644:\n\
+    movs r1, 0x80\n\
+    lsls r1, 9\n\
+    adds r0, r4, r1\n\
+    lsrs r4, r0, 16\n\
+    asrs r0, 16\n\
+    cmp r0, 0xE\n\
+    ble _080E05BE\n\
+    adds r0, r7, r1\n\
+    lsrs r1, r0, 16\n\
+    asrs r0, 16\n\
+    cmp r0, 0x9\n\
+    ble _080E05B6\n\
+    add sp, 0x4\n\
+    pop {r3-r5}\n\
+    mov r8, r3\n\
+    mov r9, r4\n\
+    mov r10, r5\n\
+    pop {r4-r7}\n\
+    pop {r0}\n\
+    bx r0\n\
+    .pool");
+}
+#endif // NONMATCHING