Finish bg.s, 6 nonmatching

4 files changed, 584 insertions, 965 deletions

diff --git a/asm/bg.s b/asm/bg.s
deleted file mode 100644
index 4e5ca7c18..000000000
--- a/asm/bg.s
+++ /dev/null
@@ -1,944 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start CopyRectToBgTilemapBufferRect
-@ void CopyRectToBgTilemapBufferRect(u8 bg, void *src, u8 srcX, u8 srcY, u8 srcWidth, u8 srcHeight, u8 destX, u8 destY, u8 rectWidth, u8 rectHeight, u8 palette1, u16 tileOffset, u16 palette2)
-CopyRectToBgTilemapBufferRect: @ 800251C
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x40
-	str r1, [sp, 0x8]
-	ldr r1, [sp, 0x60]
-	ldr r4, [sp, 0x68]
-	ldr r5, [sp, 0x6C]
-	ldr r6, [sp, 0x70]
-	ldr r7, [sp, 0x74]
-	mov r8, r7
-	ldr r7, [sp, 0x78]
-	mov r9, r7
-	ldr r7, [sp, 0x7C]
-	mov r10, r7
-	ldr r7, [sp, 0x80]
-	mov r12, r7
-	lsls r0, 24
-	lsrs r0, 24
-	str r0, [sp, 0x4]
-	lsls r2, 24
-	lsrs r2, 24
-	str r2, [sp, 0xC]
-	lsls r3, 24
-	lsrs r3, 24
-	str r3, [sp, 0x10]
-	lsls r1, 24
-	lsrs r7, r1, 24
-	lsls r4, 24
-	lsrs r4, 24
-	str r4, [sp, 0x14]
-	lsls r5, 24
-	lsrs r5, 24
-	lsls r6, 24
-	lsrs r6, 24
-	str r6, [sp, 0x18]
-	mov r0, r8
-	lsls r0, 24
-	lsrs r4, r0, 24
-	mov r1, r9
-	lsls r1, 24
-	lsrs r1, 24
-	str r1, [sp, 0x1C]
-	mov r2, r10
-	lsls r2, 16
-	lsrs r2, 16
-	str r2, [sp, 0x20]
-	mov r0, r12
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp, 0x24]
-	ldr r0, [sp, 0x4]
-	bl IsInvalidBgDuplicate
-	cmp r0, 0
-	beq _08002592
-	b _080026EE
-_08002592:
-	ldr r0, [sp, 0x4]
-	bl IsTileMapOutsideWram
-	cmp r0, 0
-	beq _0800259E
-	b _080026EE
-_0800259E:
-	ldr r0, [sp, 0x4]
-	movs r1, 0x4
-	bl GetBgControlAttribute
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp, 0x30]
-	ldr r0, [sp, 0x4]
-	movs r1, 0x1
-	bl GetBgMetricTextMode
-	lsls r0, 21
-	lsrs r0, 16
-	str r0, [sp, 0x28]
-	ldr r0, [sp, 0x4]
-	movs r1, 0x2
-	bl GetBgMetricTextMode
-	lsls r0, 21
-	lsrs r0, 16
-	str r0, [sp, 0x2C]
-	ldr r0, [sp, 0x4]
-	bl GetBgType
-	cmp r0, 0
-	beq _080025D8
-	cmp r0, 0x1
-	beq _08002674
-	b _080026EE
-_080025D8:
-	ldr r1, [sp, 0x10]
-	adds r0, r1, 0
-	muls r0, r7
-	ldr r2, [sp, 0xC]
-	adds r0, r2
-	lsls r0, 1
-	ldr r1, [sp, 0x8]
-	adds r6, r1, r0
-	adds r0, r5, r4
-	cmp r5, r0
-	blt _080025F0
-	b _080026EE
-_080025F0:
-	ldr r2, [sp, 0x18]
-	subs r2, r7, r2
-	str r2, [sp, 0x34]
-	str r0, [sp, 0x38]
-_080025F8:
-	ldr r4, [sp, 0x14]
-	ldr r7, [sp, 0x18]
-	adds r0, r4, r7
-	adds r1, r5, 0x1
-	str r1, [sp, 0x3C]
-	cmp r4, r0
-	bge _0800265A
-	ldr r2, [sp, 0x4]
-	lsls r0, r2, 4
-	ldr r1, =gUnknown_030008FC
-	adds r0, r1
-	mov r10, r0
-	ldr r7, [sp, 0x20]
-	lsls r7, 16
-	mov r9, r7
-	ldr r1, [sp, 0x24]
-	lsls r0, r1, 16
-	asrs r0, 16
-	mov r8, r0
-_0800261E:
-	ldr r2, [sp, 0x2C]
-	str r2, [sp]
-	adds r0, r4, 0
-	adds r1, r5, 0
-	ldr r2, [sp, 0x30]
-	ldr r3, [sp, 0x28]
-	bl GetTileMapIndexFromCoords
-	lsls r0, 16
-	lsrs r0, 15
-	mov r7, r10
-	ldr r1, [r7]
-	adds r1, r0
-	mov r0, r8
-	str r0, [sp]
-	adds r0, r6, 0
-	ldr r2, [sp, 0x1C]
-	mov r7, r9
-	asrs r3, r7, 16
-	bl CopyTileMapEntry
-	adds r6, 0x2
-	adds r0, r4, 0x1
-	lsls r0, 16
-	lsrs r4, r0, 16
-	ldr r1, [sp, 0x14]
-	ldr r2, [sp, 0x18]
-	adds r0, r1, r2
-	cmp r4, r0
-	blt _0800261E
-_0800265A:
-	ldr r5, [sp, 0x34]
-	lsls r0, r5, 1
-	adds r6, r0
-	ldr r7, [sp, 0x3C]
-	lsls r0, r7, 16
-	lsrs r5, r0, 16
-	ldr r0, [sp, 0x38]
-	cmp r5, r0
-	blt _080025F8
-	b _080026EE
-	.pool
-_08002674:
-	ldr r1, [sp, 0x10]
-	adds r0, r1, 0
-	muls r0, r7
-	ldr r2, [sp, 0xC]
-	adds r0, r2
-	ldr r1, [sp, 0x8]
-	adds r6, r1, r0
-	ldr r0, [sp, 0x4]
-	movs r1, 0x1
-	bl GetBgMetricAffineMode
-	lsls r0, 16
-	lsrs r0, 16
-	mov r9, r0
-	adds r0, r5, r4
-	cmp r5, r0
-	bge _080026EE
-	ldr r2, [sp, 0x18]
-	subs r2, r7, r2
-	str r2, [sp, 0x34]
-	str r0, [sp, 0x38]
-	ldr r7, =gUnknown_030008FC
-	mov r10, r7
-	ldr r0, [sp, 0x4]
-	lsls r0, 4
-	mov r8, r0
-_080026A8:
-	ldr r4, [sp, 0x14]
-	ldr r1, [sp, 0x18]
-	adds r0, r4, r1
-	adds r2, r5, 0x1
-	str r2, [sp, 0x3C]
-	cmp r4, r0
-	bge _080026DE
-	mov r3, r8
-	add r3, r10
-	mov r7, r9
-	muls r7, r5
-	mov r12, r7
-	adds r2, r0, 0
-_080026C2:
-	ldr r1, [r3]
-	mov r5, r12
-	adds r0, r5, r4
-	adds r1, r0
-	ldrb r0, [r6]
-	ldr r7, [sp, 0x20]
-	adds r0, r7
-	strb r0, [r1]
-	adds r6, 0x1
-	adds r0, r4, 0x1
-	lsls r0, 16
-	lsrs r4, r0, 16
-	cmp r4, r2
-	blt _080026C2
-_080026DE:
-	ldr r0, [sp, 0x34]
-	adds r6, r0
-	ldr r1, [sp, 0x3C]
-	lsls r0, r1, 16
-	lsrs r5, r0, 16
-	ldr r2, [sp, 0x38]
-	cmp r5, r2
-	blt _080026A8
-_080026EE:
-	add sp, 0x40
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end CopyRectToBgTilemapBufferRect
-
-	thumb_func_start FillBgTilemapBufferRect_Palette0
-@ void FillBgTilemapBufferRect_Palette0(u8 bg, u16 tileNum, u8 x, u8 y, u8 width, u8 height)
-FillBgTilemapBufferRect_Palette0: @ 8002704
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x4
-	ldr r4, [sp, 0x24]
-	ldr r5, [sp, 0x28]
-	lsls r0, 24
-	lsrs r6, r0, 24
-	lsls r1, 16
-	lsrs r1, 16
-	mov r8, r1
-	lsls r2, 24
-	lsrs r2, 24
-	mov r10, r2
-	lsls r3, 24
-	lsrs r7, r3, 24
-	lsls r4, 24
-	lsrs r4, 24
-	mov r9, r4
-	lsls r5, 24
-	lsrs r5, 24
-	adds r0, r6, 0
-	bl IsInvalidBgDuplicate
-	cmp r0, 0
-	bne _080027F0
-	adds r0, r6, 0
-	bl IsTileMapOutsideWram
-	cmp r0, 0
-	bne _080027F0
-	adds r0, r6, 0
-	bl GetBgType
-	cmp r0, 0
-	beq _08002756
-	cmp r0, 0x1
-	beq _080027A0
-	b _080027F0
-_08002756:
-	adds r3, r7, 0
-	adds r5, r3, r5
-	cmp r3, r5
-	bge _080027F0
-	adds r7, r5, 0
-	lsls r1, r6, 4
-	ldr r0, =gUnknown_030008FC
-	adds r1, r0
-	mov r12, r1
-_08002768:
-	mov r2, r10
-	mov r1, r9
-	adds r0, r2, r1
-	adds r6, r3, 0x1
-	cmp r2, r0
-	bge _08002790
-	mov r5, r12
-	ldr r4, [r5]
-	lsls r3, 5
-	adds r1, r0, 0
-_0800277C:
-	adds r0, r3, r2
-	lsls r0, 1
-	adds r0, r4
-	mov r5, r8
-	strh r5, [r0]
-	adds r0, r2, 0x1
-	lsls r0, 16
-	lsrs r2, r0, 16
-	cmp r2, r1
-	blt _0800277C
-_08002790:
-	lsls r0, r6, 16
-	lsrs r3, r0, 16
-	cmp r3, r7
-	blt _08002768
-	b _080027F0
-	.pool
-_080027A0:
-	adds r0, r6, 0
-	movs r1, 0x1
-	bl GetBgMetricAffineMode
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp]
-	adds r3, r7, 0
-	adds r5, r3, r5
-	cmp r3, r5
-	bge _080027F0
-	adds r7, r5, 0
-	lsls r6, 4
-	mov r12, r6
-_080027BC:
-	mov r2, r10
-	mov r1, r9
-	adds r0, r2, r1
-	adds r6, r3, 0x1
-	cmp r2, r0
-	bge _080027E8
-	ldr r5, =gUnknown_030008FC
-	add r5, r12
-	ldr r1, [sp]
-	adds r4, r3, 0
-	muls r4, r1
-	adds r3, r0, 0
-_080027D4:
-	ldr r0, [r5]
-	adds r1, r4, r2
-	adds r0, r1
-	mov r1, r8
-	strb r1, [r0]
-	adds r0, r2, 0x1
-	lsls r0, 16
-	lsrs r2, r0, 16
-	cmp r2, r3
-	blt _080027D4
-_080027E8:
-	lsls r0, r6, 16
-	lsrs r3, r0, 16
-	cmp r3, r7
-	blt _080027BC
-_080027F0:
-	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 FillBgTilemapBufferRect_Palette0
-
-	thumb_func_start FillBgTilemapBufferRect
-@ void FillBgTilemapBufferRect(u8 bg, u16 tileNum, u8 x, u8 y, u8 width, u8 height, u8 palette)
-FillBgTilemapBufferRect: @ 8002804
-	push {r4-r6,lr}
-	sub sp, 0x10
-	ldr r4, [sp, 0x20]
-	ldr r5, [sp, 0x24]
-	ldr r6, [sp, 0x28]
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 16
-	lsrs r1, 16
-	lsls r2, 24
-	lsrs r2, 24
-	lsls r3, 24
-	lsrs r3, 24
-	lsls r4, 24
-	lsrs r4, 24
-	lsls r5, 24
-	lsrs r5, 24
-	lsls r6, 24
-	lsrs r6, 24
-	str r4, [sp]
-	str r5, [sp, 0x4]
-	str r6, [sp, 0x8]
-	movs r4, 0
-	str r4, [sp, 0xC]
-	bl WriteSequenceToBgTilemapBuffer
-	add sp, 0x10
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end FillBgTilemapBufferRect
-
-	thumb_func_start WriteSequenceToBgTilemapBuffer
-@ void WriteSequenceToBgTilemapBuffer(u8 bg, u16 firstTileNum, u8 x, u8 y, u8 width, u8 height, u8 paletteSlot, u16 tileNumDelta)
-WriteSequenceToBgTilemapBuffer: @ 8002840
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x2C
-	ldr r4, [sp, 0x4C]
-	ldr r5, [sp, 0x50]
-	ldr r6, [sp, 0x54]
-	ldr r7, [sp, 0x58]
-	mov r8, r7
-	lsls r0, 24
-	lsrs r0, 24
-	mov r9, r0
-	add r0, sp, 0x4
-	strh r1, [r0]
-	lsls r2, 24
-	lsrs r2, 24
-	str r2, [sp, 0x8]
-	lsls r3, 24
-	lsrs r7, r3, 24
-	lsls r4, 24
-	lsrs r4, 24
-	mov r10, r4
-	lsls r5, 24
-	lsrs r4, r5, 24
-	lsls r6, 24
-	lsrs r6, 24
-	str r6, [sp, 0xC]
-	mov r0, r8
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp, 0x10]
-	mov r0, r9
-	bl IsInvalidBgDuplicate
-	cmp r0, 0
-	beq _0800288E
-	b _080029D4
-_0800288E:
-	mov r0, r9
-	bl IsTileMapOutsideWram
-	cmp r0, 0
-	beq _0800289A
-	b _080029D4
-_0800289A:
-	mov r0, r9
-	movs r1, 0x4
-	bl GetBgControlAttribute
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp, 0x1C]
-	mov r0, r9
-	movs r1, 0x1
-	bl GetBgMetricTextMode
-	lsls r0, 21
-	lsrs r0, 16
-	str r0, [sp, 0x14]
-	mov r0, r9
-	movs r1, 0x2
-	bl GetBgMetricTextMode
-	lsls r0, 21
-	lsrs r0, 16
-	str r0, [sp, 0x18]
-	mov r0, r9
-	bl GetBgType
-	cmp r0, 0
-	beq _080028D4
-	cmp r0, 0x1
-	beq _0800295C
-	b _080029D4
-_080028D4:
-	adds r5, r7, 0
-	adds r0, r5, r4
-	cmp r5, r0
-	bge _080029D4
-	str r0, [sp, 0x24]
-	add r7, sp, 0x4
-_080028E0:
-	ldr r4, [sp, 0x8]
-	mov r1, r10
-	adds r0, r4, r1
-	adds r2, r5, 0x1
-	mov r8, r2
-	cmp r4, r0
-	bge _08002944
-	mov r3, r9
-	lsls r1, r3, 4
-	ldr r0, =gUnknown_030008FC
-	adds r6, r1, r0
-_080028F6:
-	ldr r0, [sp, 0x18]
-	str r0, [sp]
-	adds r0, r4, 0
-	adds r1, r5, 0
-	ldr r2, [sp, 0x1C]
-	ldr r3, [sp, 0x14]
-	bl GetTileMapIndexFromCoords
-	lsls r0, 16
-	lsrs r0, 15
-	ldr r1, [r6]
-	adds r1, r0
-	movs r0, 0
-	str r0, [sp]
-	add r0, sp, 0x4
-	ldr r2, [sp, 0xC]
-	movs r3, 0
-	bl CopyTileMapEntry
-	ldrh r0, [r7]
-	movs r2, 0xFC
-	lsls r2, 8
-	adds r1, r2, 0
-	adds r2, r0, 0
-	ands r2, r1
-	ldr r3, [sp, 0x10]
-	adds r0, r3
-	ldr r3, =0x000003ff
-	adds r1, r3, 0
-	ands r0, r1
-	adds r2, r0
-	strh r2, [r7]
-	adds r0, r4, 0x1
-	lsls r0, 16
-	lsrs r4, r0, 16
-	ldr r0, [sp, 0x8]
-	add r0, r10
-	cmp r4, r0
-	blt _080028F6
-_08002944:
-	mov r1, r8
-	lsls r0, r1, 16
-	lsrs r5, r0, 16
-	ldr r2, [sp, 0x24]
-	cmp r5, r2
-	blt _080028E0
-	b _080029D4
-	.pool
-_0800295C:
-	mov r0, r9
-	movs r1, 0x1
-	bl GetBgMetricAffineMode
-	lsls r0, 16
-	lsrs r0, 16
-	str r0, [sp, 0x20]
-	adds r5, r7, 0
-	adds r0, r5, r4
-	cmp r5, r0
-	bge _080029D4
-	str r0, [sp, 0x24]
-	mov r3, r9
-	lsls r3, 4
-	mov r12, r3
-_0800297A:
-	ldr r4, [sp, 0x8]
-	mov r7, r10
-	adds r0, r4, r7
-	adds r1, r5, 0x1
-	mov r8, r1
-	cmp r4, r0
-	bge _080029C8
-	ldr r2, =gUnknown_030008FC
-	add r2, r12
-	str r2, [sp, 0x28]
-	ldr r7, [sp, 0x20]
-	adds r3, r5, 0
-	muls r3, r7
-	add r2, sp, 0x4
-	movs r1, 0xFC
-	lsls r1, 8
-	mov r9, r1
-	ldr r7, =0x000003ff
-	adds r5, r7, 0
-	adds r6, r0, 0
-_080029A2:
-	ldr r0, [sp, 0x28]
-	ldr r1, [r0]
-	adds r0, r3, r4
-	adds r1, r0
-	ldrh r0, [r2]
-	strb r0, [r1]
-	ldrh r0, [r2]
-	mov r1, r9
-	ands r1, r0
-	ldr r7, [sp, 0x10]
-	adds r0, r7
-	ands r0, r5
-	adds r1, r0
-	strh r1, [r2]
-	adds r0, r4, 0x1
-	lsls r0, 16
-	lsrs r4, r0, 16
-	cmp r4, r6
-	blt _080029A2
-_080029C8:
-	mov r1, r8
-	lsls r0, r1, 16
-	lsrs r5, r0, 16
-	ldr r2, [sp, 0x24]
-	cmp r5, r2
-	blt _0800297A
-_080029D4:
-	add sp, 0x2C
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end WriteSequenceToBgTilemapBuffer
-
-	thumb_func_start GetBgMetricTextMode
-@ u16 GetBgMetricTextMode(u8 bg, u8 whichMetric)
-GetBgMetricTextMode: @ 80029EC
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 24
-	lsrs r4, r1, 24
-	adds r5, r4, 0
-	movs r1, 0x4
-	bl GetBgControlAttribute
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r4, 0x1
-	beq _08002A2C
-	cmp r4, 0x1
-	bgt _08002A10
-	cmp r4, 0
-	beq _08002A16
-	b _08002A52
-_08002A10:
-	cmp r5, 0x2
-	beq _08002A3E
-	b _08002A52
-_08002A16:
-	cmp r0, 0x2
-	bgt _08002A24
-	cmp r0, 0x1
-	bge _08002A4E
-_08002A1E:
-	cmp r0, 0
-	beq _08002A46
-	b _08002A52
-_08002A24:
-	cmp r0, 0x3
-	bne _08002A52
-	movs r0, 0x4
-	b _08002A54
-_08002A2C:
-	cmp r0, 0x1
-	beq _08002A4E
-	cmp r0, 0x1
-	ble _08002A1E
-	cmp r0, 0x2
-	beq _08002A46
-	cmp r0, 0x3
-	bne _08002A52
-	b _08002A4E
-_08002A3E:
-	cmp r0, 0
-	blt _08002A52
-	cmp r0, 0x1
-	bgt _08002A4A
-_08002A46:
-	movs r0, 0x1
-	b _08002A54
-_08002A4A:
-	cmp r0, 0x3
-	bgt _08002A52
-_08002A4E:
-	movs r0, 0x2
-	b _08002A54
-_08002A52:
-	movs r0, 0
-_08002A54:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end GetBgMetricTextMode
-
-	thumb_func_start GetBgMetricAffineMode
-@ u16 GetBgMetricAffineMode(u8 bg, u8 whichMetric)
-GetBgMetricAffineMode: @ 8002A5C
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r1, 24
-	lsrs r4, r1, 24
-	movs r1, 0x4
-	bl GetBgControlAttribute
-	lsls r0, 24
-	lsrs r1, r0, 24
-	adds r0, r1, 0
-	cmp r4, 0
-	beq _08002A84
-	cmp r4, 0
-	blt _08002AAC
-	cmp r4, 0x2
-	bgt _08002AAC
-	movs r0, 0x10
-	lsls r0, r1
-	b _08002AAE
-_08002A84:
-	cmp r1, 0x1
-	beq _08002AA0
-	cmp r1, 0x1
-	bgt _08002A92
-	cmp r1, 0
-	beq _08002A9C
-	b _08002AAC
-_08002A92:
-	cmp r0, 0x2
-	beq _08002AA4
-	cmp r0, 0x3
-	beq _08002AA8
-	b _08002AAC
-_08002A9C:
-	movs r0, 0x1
-	b _08002AAE
-_08002AA0:
-	movs r0, 0x4
-	b _08002AAE
-_08002AA4:
-	movs r0, 0x10
-	b _08002AAE
-_08002AA8:
-	movs r0, 0x40
-	b _08002AAE
-_08002AAC:
-	movs r0, 0
-_08002AAE:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end GetBgMetricAffineMode
-
-	thumb_func_start GetTileMapIndexFromCoords
-@ u32 GetTileMapIndexFromCoords(u32 x, u32 y, u32 screenSize, u32 screenWidth, u32 screenHeight)
-GetTileMapIndexFromCoords: @ 8002AB4
-	push {r4,lr}
-	adds r4, r0, 0
-	ldr r0, [sp, 0x8]
-	subs r3, 0x1
-	ands r4, r3
-	subs r0, 0x1
-	ands r1, r0
-	cmp r2, 0x1
-	beq _08002AD8
-	cmp r2, 0x1
-	ble _08002AE0
-	cmp r2, 0x2
-	beq _08002AE0
-	cmp r2, 0x3
-	bne _08002AE0
-	cmp r1, 0x1F
-	ble _08002AD8
-	adds r1, 0x20
-_08002AD8:
-	cmp r4, 0x1F
-	ble _08002AE0
-	subs r4, 0x20
-	adds r1, 0x20
-_08002AE0:
-	lsls r0, r1, 5
-	adds r0, r4
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end GetTileMapIndexFromCoords
-
-	thumb_func_start CopyTileMapEntry
-@ void CopyTileMapEntry(u16 *src, u16 *dest, s32 palette1, u16 tileOffset, u32 palette2)
-CopyTileMapEntry: @ 8002AEC
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	adds r6, r1, 0
-	ldr r5, [sp, 0x10]
-	cmp r2, 0x10
-	beq _08002B14
-	cmp r2, 0x10
-	bgt _08002B34
-	cmp r2, 0
-	blt _08002B34
-	ldrh r0, [r4]
-	adds r0, r3
-	ldr r3, =0x00000fff
-	adds r1, r3, 0
-	ands r0, r1
-	adds r1, r2, r5
-	lsls r1, 12
-	b _08002B3A
-	.pool
-_08002B14:
-	ldrh r1, [r6]
-	movs r0, 0xFC
-	lsls r0, 8
-	ands r1, r0
-	lsls r2, r5, 12
-	adds r2, r1, r2
-	ldrh r0, [r4]
-	adds r0, r3
-	ldr r3, =0x000003ff
-	adds r1, r3, 0
-	ands r0, r1
-	orrs r0, r2
-	b _08002B3C
-	.pool
-_08002B34:
-	ldrh r0, [r4]
-	adds r0, r3
-	lsls r1, r5, 12
-_08002B3A:
-	adds r0, r1
-_08002B3C:
-	lsls r0, 16
-	lsrs r1, r0, 16
-	strh r1, [r6]
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end CopyTileMapEntry
-
-	thumb_func_start GetBgType
-@ u16 GetBgType(u8 bg)
-GetBgType: @ 8002B48
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	adds r5, r4, 0
-	bl GetBgMode
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r4, 0x2
-	beq _08002B76
-	cmp r4, 0x2
-	ble _08002B66
-	cmp r4, 0x3
-	beq _08002B86
-	b _08002B8E
-_08002B66:
-	cmp r5, 0
-	blt _08002B8E
-	cmp r0, 0x1
-	bgt _08002B8E
-	cmp r0, 0
-	blt _08002B8E
-_08002B72:
-	movs r0, 0
-	b _08002B90
-_08002B76:
-	cmp r0, 0
-	beq _08002B72
-	cmp r0, 0
-	blt _08002B8E
-	cmp r0, 0x2
-	bgt _08002B8E
-_08002B82:
-	movs r0, 0x1
-	b _08002B90
-_08002B86:
-	cmp r0, 0
-	beq _08002B72
-	cmp r0, 0x2
-	beq _08002B82
-_08002B8E:
-	ldr r0, =0x0000ffff
-_08002B90:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end GetBgType
-
-	thumb_func_start IsInvalidBgDuplicate
-@ bool8 IsInvalidBgDuplicate(u8 bg)
-IsInvalidBgDuplicate: @ 8002B9C
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x3
-	bhi _08002BAA
-	movs r0, 0
-	b _08002BAC
-_08002BAA:
-	movs r0, 0x1
-_08002BAC:
-	pop {r1}
-	bx r1
-	thumb_func_end IsInvalidBgDuplicate
-
-	thumb_func_start IsTileMapOutsideWram
-@ bool8 IsTileMapOutsideWram(u8 bg)
-IsTileMapOutsideWram: @ 8002BB0
-	push {lr}
-	lsls r0, 24
-	ldr r1, =gUnknown_030008F8
-	lsrs r0, 20
-	adds r1, 0x4
-	adds r0, r1
-	ldr r1, [r0]
-	ldr r0, =0x03008000
-	cmp r1, r0
-	bhi _08002BD4
-	cmp r1, 0
-	beq _08002BD4
-	movs r0, 0
-	b _08002BD6
-	.pool
-_08002BD4:
-	movs r0, 0x1
-_08002BD6:
-	pop {r1}
-	bx r1
-	thumb_func_end IsTileMapOutsideWram
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/include/gba/defines.h b/include/gba/defines.h
index 0f7f06755..66e5efcd1 100644
--- a/include/gba/defines.h
+++ b/include/gba/defines.h
@@ -15,6 +15,11 @@
 #define INTR_CHECK     (*(u16 *)0x3007FF8)
 #define INTR_VECTOR    (*(void **)0x3007FFC)
 
+#define EWRAM_START 0x02000000
+#define EWRAM_END   (EWRAM_START + 0x40000)
+#define IWRAM_START 0x03000000
+#define IWRAM_END   (IWRAM_START + 0x8000)
+
 #define PLTT      0x5000000
 #define PLTT_SIZE 0x400
 
diff --git a/ld_script.txt b/ld_script.txt
index 6668cf5d6..6cb2814fa 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -43,7 +43,6 @@ SECTIONS {
         src/dma3_manager.o(.text);
         src/gpu_regs.o(.text);
         src/bg.o(.text);
-        asm/bg.o(.text);
         asm/blit.o(.text);
         src/window.o(.text);
         src/text.o(.text);
diff --git a/src/bg.c b/src/bg.c
index 430c9599e..e4083fbcf 100644
--- a/src/bg.c
+++ b/src/bg.c
@@ -50,18 +50,19 @@ extern struct BgConfig2 gUnknown_030008F8[4]; // gGpuBgConfigs2
 extern u32 gUnknown_03000938[4];
 extern u32 gUnneededFireRedVariable;
 extern struct BgConfig gZeroedBgControlStruct;
-extern bool32 IsInvalidBgDuplicate(u8 bg);
+extern bool32 IsInvalidBg32(u8 bg);
 
 void ResetBgControlStructs();
 u16 GetBgMetricTextMode(u8 bg, u8 whichMetric);
-u16 GetBgMetricAffineMode(u8 bg, u8 whichMetric);
+u32 GetBgMetricAffineMode(u8 bg, u8 whichMetric);
 u32 GetBgType(u8 bg);
 void SetTextModeAndHideBgs();
 bool8 IsInvalidBg(u8 bg);
 bool32 IsTileMapOutsideWram(u8 bg);
 void CopyRectToBgTilemapBufferRect(u8 bg, void *src, u8 srcX, u8 srcY, u8 srcWidth, u8 srcHeight, u8 destX, u8 destY, u8 rectWidth, u8 rectHeight, u8 palette1, u16 tileOffset, u16 palette2);
-void CopyTileMapEntry(u16 *src, u16 *dest, s32 palette1, u16 tileOffset, u32 palette2);
-u32 GetTileMapIndexFromCoords(u32 x, u32 y, u32 screenSize, u32 screenWidth, u32 screenHeight);
+void CopyTileMapEntry(u16 *src, u16 *dest, s32 palette1, u32 tileOffset, u32 palette2);
+u32 GetTileMapIndexFromCoords(s32 x, s32 y, s32 screenSize, u32 screenWidth, u32 screenHeight);
+void WriteSequenceToBgTilemapBuffer(u8 bg, u16 firstTileNum, u8 x, u8 y, u8 width, u8 height, u8 paletteSlot, s16 tileNumDelta);
 
 extern void SetGpuReg(u8 regOffset, u16 value);
 extern void SetGpuReg_ForcedBlank(u8 regOffset, u16 value);
@@ -437,7 +438,7 @@ u16 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
     u16 unk_1;
     s8 cursor;
     
-    if (IsInvalidBgDuplicate(bg) == FALSE)
+    if (IsInvalidBg32(bg) == FALSE)
     {
         unk_1 = (gUnknown_030008F8[bg].unk_2 * 0x20) + (destOffset * 2);
         cursor = RequestDma3Copy(src, (void*)(unk_1 + BG_PLTT), size, 0);
@@ -623,7 +624,7 @@ u32 ChangeBgX(u8 bg, u32 value, u8 op)
     u8 mode;
     u32 temp1;
     
-    if (IsInvalidBgDuplicate(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
+    if (IsInvalidBg32(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
     {
         return -1;
     }
@@ -691,7 +692,7 @@ u32 ChangeBgX(u8 bg, u32 value, u8 op)
     lsl r2, #24\n\
     lsr r5, r2, #24\n\
     add r0, r4, #0\n\
-    bl IsInvalidBgDuplicate\n\
+    bl IsInvalidBg32\n\
     cmp r0, #0\n\
     bne _08001D28\n\
     add r0, r4, #0\n\
@@ -838,7 +839,7 @@ _08001E34:\n\
 
 u32 GetBgX(u8 bg)
 {
-    if (IsInvalidBgDuplicate(bg) != FALSE)
+    if (IsInvalidBg32(bg) != FALSE)
         return -1;
     if (GetBgControlAttribute(bg, 0x1) == 0)
         return -1;
@@ -851,7 +852,7 @@ u32 ChangeBgY(u8 bg, u32 value, u8 op)
     u8 mode;
     u32 temp1;
     
-    if (IsInvalidBgDuplicate(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
+    if (IsInvalidBg32(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
     {
         return -1;
     }
@@ -921,7 +922,7 @@ u32 ChangeBgY(u8 bg, u32 value, u8 op)
 	lsl r2, #24\n\
 	lsr r5, r2, #24\n\
 	add r0, r4, #0\n\
-	bl IsInvalidBgDuplicate\n\
+	bl IsInvalidBg32\n\
 	cmp r0, #0\n\
 	bne _08001EA0\n\
 	add r0, r4, #0\n\
@@ -1072,7 +1073,7 @@ u32 ChangeBgY_ScreenOff(u8 bg, u32 value, u8 op)
     u8 mode;
     u16 temp1;
     
-    if (IsInvalidBgDuplicate(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
+    if (IsInvalidBg32(bg) != FALSE || GetBgControlAttribute(bg, 1) == 0)
     {
         return -1;
     }
@@ -1143,7 +1144,7 @@ u32 ChangeBgY_ScreenOff(u8 bg, u32 value, u8 op)
     lsl r2, #24\n\
     lsr r5, r2, #24\n\
     add r0, r4, #0\n\
-    bl IsInvalidBgDuplicate\n\
+    bl IsInvalidBg32\n\
     cmp r0, #0\n\
     bne _08001FDC\n\
     add r0, r4, #0\n\
@@ -1290,7 +1291,7 @@ _080020E8:\n\
 
 u32 GetBgY(u8 bg)
 {
-    if (IsInvalidBgDuplicate(bg) != FALSE)
+    if (IsInvalidBg32(bg) != FALSE)
         return -1;
     if (GetBgControlAttribute(bg, 0x1) == 0)
         return -1;
@@ -1379,7 +1380,7 @@ u8 Unused_AdjustBgMosaic(u8 a1, u8 a2)
 
 void SetBgTilemapBuffer(u8 bg, void *tilemap)
 {
-    if (IsInvalidBgDuplicate(bg) == FALSE && GetBgControlAttribute(bg, 0x1) != 0x0)
+    if (IsInvalidBg32(bg) == FALSE && GetBgControlAttribute(bg, 0x1) != 0x0)
     {
         gUnknown_030008F8[bg].tilemap = tilemap;
     }
@@ -1387,7 +1388,7 @@ void SetBgTilemapBuffer(u8 bg, void *tilemap)
 
 void UnsetBgTilemapBuffer(u8 bg)
 {
-    if (IsInvalidBgDuplicate(bg) == FALSE && GetBgControlAttribute(bg, 0x1) != 0x0)
+    if (IsInvalidBg32(bg) == FALSE && GetBgControlAttribute(bg, 0x1) != 0x0)
     {
         gUnknown_030008F8[bg].tilemap = NULL;
     }
@@ -1395,7 +1396,7 @@ void UnsetBgTilemapBuffer(u8 bg)
 
 void* GetBgTilemapBuffer(u8 bg)
 {
-    if (IsInvalidBgDuplicate(bg) != FALSE)
+    if (IsInvalidBg32(bg) != FALSE)
         return NULL;
     if (GetBgControlAttribute(bg, 0x1) == 0)
         return NULL;
@@ -1404,7 +1405,7 @@ void* GetBgTilemapBuffer(u8 bg)
 
 void CopyToBgTilemapBuffer(u8 bg, void *src, u16 mode, u16 destOffset)
 {
-    if (IsInvalidBgDuplicate(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
     {
         if (mode != 0)
         {
@@ -1421,7 +1422,7 @@ void CopyBgTilemapBufferToVram(u8 bg)
 {
     u16 sizeToLoad;
     
-    if (IsInvalidBgDuplicate(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
     {
         switch (GetBgType(bg))
         {
@@ -1446,7 +1447,7 @@ void CopyToBgTilemapBufferRect(u8 bg, void* src, u8 destX, u8 destY, u8 width, u
     u16 destY16;
     u16 mode;
     
-    if (IsInvalidBgDuplicate(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
     {
         switch (GetBgType(bg))
         {
@@ -1479,6 +1480,7 @@ void CopyToBgTilemapBufferRect_ChangePalette(u8 bg, void *src, u8 destX, u8 dest
 {
     CopyRectToBgTilemapBufferRect(bg, src, 0, 0, rectWidth, rectHeight, destX, destY, rectWidth, rectHeight, palette, 0, 0);
 }
+// Skipping for now, it probably uses structs passed by value
 /*
 void CopyRectToBgTilemapBufferRect(u8 bg, void* src, u8 srcX, u8 srcY, u8 srcWidth, u8 srcHeight, u8 destX, u8 destY, u8 rectWidth, u8 rectHeight, u8 palette1, u16 tileOffset, u16 palette2)
 {
@@ -1490,7 +1492,7 @@ void CopyRectToBgTilemapBufferRect(u8 bg, void* src, u8 srcX, u8 srcY, u8 srcWid
     u16 destX16;
     u16 destY16;
     
-    if (IsInvalidBgDuplicate(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
     {
         attribute = GetBgControlAttribute(bg, 0x4);
         mode = GetBgMetricTextMode(bg, 0x1) * 0x20;
@@ -1521,3 +1523,560 @@ void CopyRectToBgTilemapBufferRect(u8 bg, void* src, u8 srcX, u8 srcY, u8 srcWid
         }
     }
 }*/
+__attribute__((naked))
+void CopyRectToBgTilemapBufferRect(u8 bg, void* src, u8 srcX, u8 srcY, u8 srcWidth, u8 srcHeight, u8 destX, u8 destY, u8 rectWidth, u8 rectHeight, u8 palette1, u16 tileOffset, u16 palette2)
+{
+    asm("push {r4-r7,lr}\n\
+    mov r7, r10\n\
+    mov r6, r9\n\
+    mov r5, r8\n\
+    push {r5-r7}\n\
+    sub sp, #0x40\n\
+    str r1, [sp, #0x8]\n\
+    ldr r1, [sp, #0x60]\n\
+    ldr r4, [sp, #0x68]\n\
+    ldr r5, [sp, #0x6C]\n\
+    ldr r6, [sp, #0x70]\n\
+    ldr r7, [sp, #0x74]\n\
+    mov r8, r7\n\
+    ldr r7, [sp, #0x78]\n\
+    mov r9, r7\n\
+    ldr r7, [sp, #0x7C]\n\
+    mov r10, r7\n\
+    ldr r7, [sp, #0x80]\n\
+    mov r12, r7\n\
+    lsl r0, #24\n\
+    lsr r0, #24\n\
+    str r0, [sp, #0x4]\n\
+    lsl r2, #24\n\
+    lsr r2, #24\n\
+    str r2, [sp, #0xC]\n\
+    lsl r3, #24\n\
+    lsr r3, #24\n\
+    str r3, [sp, #0x10]\n\
+    lsl r1, #24\n\
+    lsr r7, r1, #24\n\
+    lsl r4, #24\n\
+    lsr r4, #24\n\
+    str r4, [sp, #0x14]\n\
+    lsl r5, #24\n\
+    lsr r5, #24\n\
+    lsl r6, #24\n\
+    lsr r6, #24\n\
+    str r6, [sp, #0x18]\n\
+    mov r0, r8\n\
+    lsl r0, #24\n\
+    lsr r4, r0, #24\n\
+    mov r1, r9\n\
+    lsl r1, #24\n\
+    lsr r1, #24\n\
+    str r1, [sp, #0x1C]\n\
+    mov r2, r10\n\
+    lsl r2, #16\n\
+    lsr r2, #16\n\
+    str r2, [sp, #0x20]\n\
+    mov r0, r12\n\
+    lsl r0, #16\n\
+    lsr r0, #16\n\
+    str r0, [sp, #0x24]\n\
+    ldr r0, [sp, #0x4]\n\
+    bl IsInvalidBg32\n\
+    cmp r0, #0\n\
+    beq _08002592\n\
+    b _080026EE\n\
+_08002592:\n\
+    ldr r0, [sp, #0x4]\n\
+    bl IsTileMapOutsideWram\n\
+    cmp r0, #0\n\
+    beq _0800259E\n\
+    b _080026EE\n\
+_0800259E:\n\
+    ldr r0, [sp, #0x4]\n\
+    mov r1, #0x4\n\
+    bl GetBgControlAttribute\n\
+    lsl r0, #16\n\
+    lsr r0, #16\n\
+    str r0, [sp, #0x30]\n\
+    ldr r0, [sp, #0x4]\n\
+    mov r1, #0x1\n\
+    bl GetBgMetricTextMode\n\
+    lsl r0, #21\n\
+    lsr r0, #16\n\
+    str r0, [sp, #0x28]\n\
+    ldr r0, [sp, #0x4]\n\
+    mov r1, #0x2\n\
+    bl GetBgMetricTextMode\n\
+    lsl r0, #21\n\
+    lsr r0, #16\n\
+    str r0, [sp, #0x2C]\n\
+    ldr r0, [sp, #0x4]\n\
+    bl GetBgType\n\
+    cmp r0, #0\n\
+    beq _080025D8\n\
+    cmp r0, #0x1\n\
+    beq _08002674\n\
+    b _080026EE\n\
+_080025D8:\n\
+    ldr r1, [sp, #0x10]\n\
+    add r0, r1, #0\n\
+    mul r0, r7\n\
+    ldr r2, [sp, #0xC]\n\
+    add r0, r2\n\
+    lsl r0, #1\n\
+    ldr r1, [sp, #0x8]\n\
+    add r6, r1, r0\n\
+    add r0, r5, r4\n\
+    cmp r5, r0\n\
+    blt _080025F0\n\
+    b _080026EE\n\
+_080025F0:\n\
+    ldr r2, [sp, #0x18]\n\
+    sub r2, r7, r2\n\
+    str r2, [sp, #0x34]\n\
+    str r0, [sp, #0x38]\n\
+_080025F8:\n\
+    ldr r4, [sp, #0x14]\n\
+    ldr r7, [sp, #0x18]\n\
+    add r0, r4, r7\n\
+    add r1, r5, #0x1\n\
+    str r1, [sp, #0x3C]\n\
+    cmp r4, r0\n\
+    bge _0800265A\n\
+    ldr r2, [sp, #0x4]\n\
+    lsl r0, r2, #4\n\
+    ldr r1, =gUnknown_030008FC\n\
+    add r0, r1\n\
+    mov r10, r0\n\
+    ldr r7, [sp, #0x20]\n\
+    lsl r7, #16\n\
+    mov r9, r7\n\
+    ldr r1, [sp, #0x24]\n\
+    lsl r0, r1, #16\n\
+    asr r0, #16\n\
+    mov r8, r0\n\
+_0800261E:\n\
+    ldr r2, [sp, #0x2C]\n\
+    str r2, [sp]\n\
+    add r0, r4, #0\n\
+    add r1, r5, #0\n\
+    ldr r2, [sp, #0x30]\n\
+    ldr r3, [sp, #0x28]\n\
+    bl GetTileMapIndexFromCoords\n\
+    lsl r0, #16\n\
+    lsr r0, #15\n\
+    mov r7, r10\n\
+    ldr r1, [r7]\n\
+    add r1, r0\n\
+    mov r0, r8\n\
+    str r0, [sp]\n\
+    add r0, r6, #0\n\
+    ldr r2, [sp, #0x1C]\n\
+    mov r7, r9\n\
+    asr r3, r7, #16\n\
+    bl CopyTileMapEntry\n\
+    add r6, #0x2\n\
+    add r0, r4, #0x1\n\
+    lsl r0, #16\n\
+    lsr r4, r0, #16\n\
+    ldr r1, [sp, #0x14]\n\
+    ldr r2, [sp, #0x18]\n\
+    add r0, r1, r2\n\
+    cmp r4, r0\n\
+    blt _0800261E\n\
+_0800265A:\n\
+    ldr r5, [sp, #0x34]\n\
+    lsl r0, r5, #1\n\
+    add r6, r0\n\
+    ldr r7, [sp, #0x3C]\n\
+    lsl r0, r7, #16\n\
+    lsr r5, r0, #16\n\
+    ldr r0, [sp, #0x38]\n\
+    cmp r5, r0\n\
+    blt _080025F8\n\
+    b _080026EE\n\
+    .pool\n\
+_08002674:\n\
+    ldr r1, [sp, #0x10]\n\
+    add r0, r1, #0\n\
+    mul r0, r7\n\
+    ldr r2, [sp, #0xC]\n\
+    add r0, r2\n\
+    ldr r1, [sp, #0x8]\n\
+    add r6, r1, r0\n\
+    ldr r0, [sp, #0x4]\n\
+    mov r1, #0x1\n\
+    bl GetBgMetricAffineMode\n\
+    lsl r0, #16\n\
+    lsr r0, #16\n\
+    mov r9, r0\n\
+    add r0, r5, r4\n\
+    cmp r5, r0\n\
+    bge _080026EE\n\
+    ldr r2, [sp, #0x18]\n\
+    sub r2, r7, r2\n\
+    str r2, [sp, #0x34]\n\
+    str r0, [sp, #0x38]\n\
+    ldr r7, =gUnknown_030008FC\n\
+    mov r10, r7\n\
+    ldr r0, [sp, #0x4]\n\
+    lsl r0, #4\n\
+    mov r8, r0\n\
+_080026A8:\n\
+    ldr r4, [sp, #0x14]\n\
+    ldr r1, [sp, #0x18]\n\
+    add r0, r4, r1\n\
+    add r2, r5, #0x1\n\
+    str r2, [sp, #0x3C]\n\
+    cmp r4, r0\n\
+    bge _080026DE\n\
+    mov r3, r8\n\
+    add r3, r10\n\
+    mov r7, r9\n\
+    mul r7, r5\n\
+    mov r12, r7\n\
+    add r2, r0, #0\n\
+_080026C2:\n\
+    ldr r1, [r3]\n\
+    mov r5, r12\n\
+    add r0, r5, r4\n\
+    add r1, r0\n\
+    ldrb r0, [r6]\n\
+    ldr r7, [sp, #0x20]\n\
+    add r0, r7\n\
+    strb r0, [r1]\n\
+    add r6, #0x1\n\
+    add r0, r4, #0x1\n\
+    lsl r0, #16\n\
+    lsr r4, r0, #16\n\
+    cmp r4, r2\n\
+    blt _080026C2\n\
+_080026DE:\n\
+    ldr r0, [sp, #0x34]\n\
+    add r6, r0\n\
+    ldr r1, [sp, #0x3C]\n\
+    lsl r0, r1, #16\n\
+    lsr r5, r0, #16\n\
+    ldr r2, [sp, #0x38]\n\
+    cmp r5, r2\n\
+    blt _080026A8\n\
+_080026EE:\n\
+    add sp, #0x40\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\n");
+}
+
+void FillBgTilemapBufferRect_Palette0(u8 bg, u16 tileNum, u8 x, u8 y, u8 width, u8 height)
+{
+    u16 x16;
+    u16 y16;
+    u16 mode;
+    
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    {
+        switch (GetBgType(bg))
+        {
+            case 0:
+                for (y16 = y; y16 < (y + height); y16++)
+                {
+                    for (x16 = x; x16 < (x + width); x16++)
+                    {
+                        ((u16*)gUnknown_030008F8[bg].tilemap)[((y16 * 0x20) + x16)] = tileNum;
+                    }
+                }
+                break;
+            case 1:
+                mode = GetBgMetricAffineMode(bg, 0x1);
+                for (y16 = y; y16 < (y + height); y16++)
+                {
+                    for (x16 = x; x16 < (x + width); x16++)
+                    {
+                        ((u8*)gUnknown_030008F8[bg].tilemap)[((y16 * mode) + x16)] = tileNum;
+                    }
+                }
+                break;
+        }
+    }
+}
+
+void FillBgTilemapBufferRect(u8 bg, u16 tileNum, u8 x, u8 y, u8 width, u8 height, u8 palette)
+{
+    WriteSequenceToBgTilemapBuffer(bg, tileNum, x, y, width, height, palette, 0);
+}
+
+void WriteSequenceToBgTilemapBuffer(u8 bg, u16 firstTileNum, u8 x, u8 y, u8 width, u8 height, u8 paletteSlot, s16 tileNumDelta)
+{
+    u16 mode;
+    u16 mode2;
+    u16 attribute;
+    u16 mode3;
+    
+    u16 x16;
+    u16 y16;
+    
+    if (IsInvalidBg32(bg) == FALSE && IsTileMapOutsideWram(bg) == FALSE)
+    {
+        attribute = GetBgControlAttribute(bg, 0x4);
+        mode = GetBgMetricTextMode(bg, 0x1) * 0x20;
+        mode2 = GetBgMetricTextMode(bg, 0x2) * 0x20;
+        switch (GetBgType(bg))
+        {
+            case 0:
+                for (y16 = y; y16 < (y + height); y16++)
+                {
+                    for (x16 = x; x16 < (x + width); x16++)
+                    {
+                        CopyTileMapEntry(&firstTileNum, &((u16*)gUnknown_030008F8[bg].tilemap)[(u16)GetTileMapIndexFromCoords(x16, y16, attribute, mode, mode2)], paletteSlot, 0, 0);
+                        firstTileNum = (firstTileNum & 0xFC00) + ((firstTileNum + tileNumDelta) & 0x3FF);
+                    }
+                }
+                break;
+            case 1:
+                mode3 = GetBgMetricAffineMode(bg, 0x1);
+                for (y16 = y; y16 < (y + height); y16++)
+                {
+                    for (x16 = x; x16 < (x + width); x16++)
+                    {
+                        ((u8*)gUnknown_030008F8[bg].tilemap)[(y16 * mode3) + x16] = firstTileNum;
+                        firstTileNum = (firstTileNum & 0xFC00) + ((firstTileNum + tileNumDelta) & 0x3FF);
+                    }
+                }
+                break;
+        }
+    }
+}
+
+u16 GetBgMetricTextMode(u8 bg, u8 whichMetric)
+{
+    u8 attribute;
+    
+    attribute = GetBgControlAttribute(bg, 0x4);
+    
+    switch (whichMetric)
+    {
+        case 0:
+            switch (attribute)
+            {
+                case 0:
+                    return 1;
+                case 1:
+                case 2:
+                    return 2;
+                case 3:
+                    return 4;
+            }
+            break;
+        case 1:
+            switch (attribute)
+            {
+                case 0:
+                    return 1;
+                case 1:
+                    return 2;
+                case 2:
+                    return 1;
+                case 3:
+                    return 2;
+            }
+            break;
+        case 2:
+            switch (attribute)
+            {
+                case 0:
+                case 1:
+                    return 1;
+                case 2:
+                case 3:
+                    return 2;
+            }
+            break;
+    }
+    return 0;
+}
+
+u32 GetBgMetricAffineMode(u8 bg, u8 whichMetric)
+{
+    u8 attribute;
+    
+    attribute = GetBgControlAttribute(bg, 0x4);
+    
+    switch (whichMetric)
+    {
+        case 0:
+            switch (attribute)
+            {
+                case 0:
+                    return 0x1;
+                case 1:
+                    return 0x4;
+                case 2:
+                    return 0x10;
+                case 3:
+                    return 0x40;
+            }
+            break;
+        case 1:
+        case 2:
+            return 0x10 << attribute;
+    }
+    return 0;
+}
+
+u32 GetTileMapIndexFromCoords(s32 x, s32 y, s32 screenSize, u32 screenWidth, u32 screenHeight)
+{
+    x = x & (screenWidth - 1);
+    y = y & (screenHeight - 1);
+    
+    switch (screenSize)
+    {
+        case 0:
+        case 2:
+            break;
+        case 3:
+            if (y >= 0x20)
+                y += 0x20;
+        case 1:
+            if (x >= 0x20)
+            {
+                x -= 0x20;
+                y += 0x20;
+            }
+    }
+    return (y * 0x20) + x;
+}
+
+#ifdef NONMATCHING // This one has some weird switch statement cases that refuse to cooperate
+void CopyTileMapEntry(u16 *src, u16 *dest, s32 palette1, u32 tileOffset, u32 palette2)
+{
+    u16 test;
+    switch (palette1)
+    {
+        case 0x0 ... 0x10:
+            if (palette1 != 0x10)
+                test = ((*src + tileOffset) & 0xFFF) + ((palette1 + palette2) << 12);
+            else
+                test = ((*dest & 0xFC00) + (palette2 << 12)) | ((*src + tileOffset) & 0x3FF);
+            break;
+        default:
+            test = *src + tileOffset + (palette2 << 12);
+            break;
+    }
+    
+    *dest = test;
+}
+#else
+__attribute__((naked))
+void CopyTileMapEntry(u16 *src, u16 *dest, s32 palette1, u32 tileOffset, u32 palette2)
+{
+    asm("push {r4-r6,lr}\n\
+    add r4, r0, #0\n\
+    add r6, r1, #0\n\
+    ldr r5, [sp, #0x10]\n\
+    cmp r2, #0x10\n\
+    beq _08002B14\n\
+    cmp r2, #0x10\n\
+    bgt _08002B34\n\
+    cmp r2, #0\n\
+    blt _08002B34\n\
+    ldrh r0, [r4]\n\
+    add r0, r3\n\
+    ldr r3, =0x00000fff\n\
+    add r1, r3, #0\n\
+    and r0, r1\n\
+    add r1, r2, r5\n\
+    lsl r1, #12\n\
+    b _08002B3A\n\
+    .pool\n\
+_08002B14:\n\
+    ldrh r1, [r6]\n\
+    mov r0, #0xFC\n\
+    lsl r0, #8\n\
+    and r1, r0\n\
+    lsl r2, r5, #12\n\
+    add r2, r1, r2\n\
+    ldrh r0, [r4]\n\
+    add r0, r3\n\
+    ldr r3, =0x000003ff\n\
+    add r1, r3, #0\n\
+    and r0, r1\n\
+    orr r0, r2\n\
+    b _08002B3C\n\
+    .pool\n\
+_08002B34:\n\
+    ldrh r0, [r4]\n\
+    add r0, r3\n\
+    lsl r1, r5, #12\n\
+_08002B3A:\n\
+    add r0, r1\n\
+_08002B3C:\n\
+    lsl r0, #16\n\
+    lsr r1, r0, #16\n\
+    strh r1, [r6]\n\
+    pop {r4-r6}\n\
+    pop {r0}\n\
+    bx r0\n");
+}
+#endif // NONMATCHING
+
+u32 GetBgType(u8 bg)
+{
+    u8 mode;
+    
+    mode = GetBgMode();
+    
+    
+    switch (bg)
+    {
+        case 0:
+        case 1:
+            switch (mode)
+            {
+                case 0:
+                case 1:
+                    return 0;
+            }
+            break;
+        case 2:
+            switch (mode)
+            {
+                case 0:
+                    return 0;
+                case 1:
+                case 2:
+                    return 1;
+            }
+            break;
+        case 3:
+            switch (mode)
+            {
+                case 0:
+                    return 0;
+                case 2:
+                    return 1;
+            }
+            break;
+    }
+    
+    return 0xFFFF;
+}
+
+bool32 IsInvalidBg32(u8 bg)
+{
+    if (bg > 3)
+        return TRUE;
+    return FALSE;
+}
+
+bool32 IsTileMapOutsideWram(u8 bg)
+{
+    if (gUnknown_030008F8[bg].tilemap > (void*)IWRAM_END)
+        return TRUE;
+    if (gUnknown_030008F8[bg].tilemap == 0x0)
+        return TRUE;
+    return FALSE;
+}