Port/decompile fieldmap.c

20 files changed, 1091 insertions, 2334 deletions

diff --git a/asm/fieldmap.s b/asm/fieldmap.s
deleted file mode 100644
index 21aea8ad7..000000000
--- a/asm/fieldmap.s
+++ /dev/null
@@ -1,2285 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start mapconnection_get_mapheader
-mapconnection_get_mapheader: @ 8087D44
-	push {lr}
-	ldrb r2, [r0, 0x8]
-	ldrb r1, [r0, 0x9]
-	adds r0, r2, 0
-	bl Overworld_GetMapHeaderByGroupAndId
-	pop {r1}
-	bx r1
-	thumb_func_end mapconnection_get_mapheader
-
-	thumb_func_start not_trainer_hill_battle_pyramid
-not_trainer_hill_battle_pyramid: @ 8087D54
-	push {r4,lr}
-	ldr r4, =gMapHeader
-	adds r0, r4, 0
-	bl mapheader_copy_mapdata_with_padding
-	ldr r0, [r4, 0x4]
-	bl sub_80E8EE0
-	bl mapheader_run_script_with_tag_x1
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end not_trainer_hill_battle_pyramid
-
-	thumb_func_start sub_8087D74
-sub_8087D74: @ 8087D74
-	push {r4,lr}
-	ldr r4, =gMapHeader
-	adds r0, r4, 0
-	bl mapheader_copy_mapdata_with_padding
-	movs r0, 0
-	bl sub_80E9238
-	ldr r0, [r4, 0x4]
-	bl sub_80E8EE0
-	bl mapdata_from_sav2
-	bl mapheader_run_script_with_tag_x1
-	ldr r1, =gUnknown_03005DC0
-	ldr r0, [r1]
-	ldr r1, [r1, 0x4]
-	bl UpdateTVScreensOnMap
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8087D74
-
-	thumb_func_start battle_pyramid_map_load_related
-battle_pyramid_map_load_related: @ 8087DAC
-	push {r4,r5,lr}
-	sub sp, 0x4
-	adds r4, r0, 0
-	lsls r4, 24
-	lsrs r4, 24
-	ldr r0, =0x03ff03ff
-	str r0, [sp]
-	ldr r5, =gUnknown_02032318
-	ldr r2, =0x01001400
-	mov r0, sp
-	adds r1, r5, 0
-	bl CpuFastSet
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl sub_81AA078
-	add sp, 0x4
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end battle_pyramid_map_load_related
-
-	thumb_func_start trainer_hill_map_load_related
-trainer_hill_map_load_related: @ 8087DE4
-	push {r4,lr}
-	sub sp, 0x4
-	ldr r0, =0x03ff03ff
-	str r0, [sp]
-	ldr r4, =gUnknown_02032318
-	ldr r2, =0x01001400
-	mov r0, sp
-	adds r1, r4, 0
-	bl CpuFastSet
-	adds r0, r4, 0
-	bl sub_81D5FB4
-	add sp, 0x4
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end trainer_hill_map_load_related
-
-	thumb_func_start mapheader_copy_mapdata_with_padding
-@ void mapheader_copy_mapdata_with_padding(struct mapheader *mapHeader)
-mapheader_copy_mapdata_with_padding: @ 8087E14
-	push {r4-r6,lr}
-	sub sp, 0x4
-	adds r6, r0, 0
-	ldr r5, [r6]
-	ldr r0, =0x03ff03ff
-	str r0, [sp]
-	ldr r4, =gUnknown_02032318
-	ldr r2, =0x01001400
-	mov r0, sp
-	adds r1, r4, 0
-	bl CpuFastSet
-	ldr r2, =gUnknown_03005DC0
-	str r4, [r2, 0x8]
-	ldr r1, [r5]
-	adds r1, 0xF
-	str r1, [r2]
-	ldr r0, [r5, 0x4]
-	adds r0, 0xE
-	str r0, [r2, 0x4]
-	muls r1, r0
-	movs r0, 0xA0
-	lsls r0, 6
-	cmp r1, r0
-	bgt _08087E56
-	ldr r0, [r5, 0xC]
-	ldrh r1, [r5]
-	ldrh r2, [r5, 0x4]
-	bl map_copy_with_padding
-	adds r0, r6, 0
-	bl mapheader_copy_mapdata_of_adjacent_maps
-_08087E56:
-	add sp, 0x4
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end mapheader_copy_mapdata_with_padding
-
-	thumb_func_start map_copy_with_padding
-@ int map_copy_with_padding(void *src)
-map_copy_with_padding: @ 8087E70
-	push {r4-r7,lr}
-	mov r7, r9
-	mov r6, r8
-	push {r6,r7}
-	adds r7, r0, 0
-	lsls r1, 16
-	lsrs r1, 16
-	mov r8, r1
-	lsls r2, 16
-	lsrs r2, 16
-	ldr r0, =gUnknown_03005DC0
-	ldr r4, [r0, 0x8]
-	ldr r1, [r0]
-	lsls r0, r1, 3
-	subs r0, r1
-	lsls r0, 1
-	adds r0, 0xE
-	adds r4, r0
-	cmp r2, 0
-	beq _08087EB8
-	mov r0, r8
-	lsls r6, r0, 1
-	adds r5, r2, 0
-	movs r0, 0x1E
-	adds r0, r6
-	mov r9, r0
-_08087EA4:
-	adds r0, r7, 0
-	adds r1, r4, 0
-	mov r2, r8
-	bl CpuSet
-	add r4, r9
-	adds r7, r6
-	subs r5, 0x1
-	cmp r5, 0
-	bne _08087EA4
-_08087EB8:
-	pop {r3,r4}
-	mov r8, r3
-	mov r9, r4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end map_copy_with_padding
-
-	thumb_func_start mapheader_copy_mapdata_of_adjacent_maps
-@ void mapheader_copy_mapdata_of_adjacent_maps(struct mapheader *mapHeader)
-mapheader_copy_mapdata_of_adjacent_maps: @ 8087EC8
-	push {r4-r7,lr}
-	adds r6, r0, 0
-	ldr r0, [r6, 0xC]
-	cmp r0, 0
-	beq _08087F4C
-	ldr r1, [r0]
-	ldr r5, [r0, 0x4]
-	ldr r2, =gUnknown_02037340
-	ldr r0, =gUnknown_08486EF8
-	ldr r0, [r0]
-	str r0, [r2]
-	cmp r1, 0
-	ble _08087F4C
-	adds r4, r2, 0
-	adds r7, r1, 0
-_08087EE6:
-	adds r0, r5, 0
-	bl mapconnection_get_mapheader
-	adds r1, r0, 0
-	ldr r2, [r5, 0x4]
-	ldrb r0, [r5]
-	cmp r0, 0x2
-	beq _08087F1E
-	cmp r0, 0x2
-	bgt _08087F08
-	cmp r0, 0x1
-	beq _08087F12
-	b _08087F44
-	.pool
-_08087F08:
-	cmp r0, 0x3
-	beq _08087F2A
-	cmp r0, 0x4
-	beq _08087F36
-	b _08087F44
-_08087F12:
-	adds r0, r6, 0
-	bl sub_8087FB8
-	ldrb r0, [r4]
-	movs r1, 0x1
-	b _08087F40
-_08087F1E:
-	adds r0, r6, 0
-	bl sub_8088020
-	ldrb r0, [r4]
-	movs r1, 0x2
-	b _08087F40
-_08087F2A:
-	adds r0, r6, 0
-	bl sub_8088080
-	ldrb r0, [r4]
-	movs r1, 0x4
-	b _08087F40
-_08087F36:
-	adds r0, r6, 0
-	bl sub_80880E0
-	ldrb r0, [r4]
-	movs r1, 0x8
-_08087F40:
-	orrs r0, r1
-	strb r0, [r4]
-_08087F44:
-	subs r7, 0x1
-	adds r5, 0xC
-	cmp r7, 0
-	bne _08087EE6
-_08087F4C:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end mapheader_copy_mapdata_of_adjacent_maps
-
-	thumb_func_start sub_8087F54
-sub_8087F54: @ 8087F54
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	ldr r5, [sp, 0x18]
-	ldr r4, [r2]
-	ldr r7, [r4]
-	adds r2, r7, 0
-	muls r2, r5
-	adds r2, r3
-	lsls r2, 1
-	ldr r3, [r4, 0xC]
-	adds r6, r3, r2
-	ldr r3, =gUnknown_03005DC0
-	ldr r2, [r3]
-	muls r1, r2
-	adds r1, r0
-	lsls r1, 1
-	ldr r0, [r3, 0x8]
-	adds r5, r0, r1
-	ldr r0, [sp, 0x20]
-	cmp r0, 0
-	ble _08087FA6
-	adds r4, r0, 0
-	ldr r3, =0x001fffff
-	mov r8, r3
-_08087F86:
-	adds r0, r6, 0
-	adds r1, r5, 0
-	ldr r2, [sp, 0x1C]
-	mov r3, r8
-	ands r2, r3
-	bl CpuSet
-	ldr r0, =gUnknown_03005DC0
-	ldr r0, [r0]
-	lsls r0, 1
-	adds r5, r0
-	lsls r0, r7, 1
-	adds r6, r0
-	subs r4, 0x1
-	cmp r4, 0
-	bne _08087F86
-_08087FA6:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8087F54
-
-	thumb_func_start sub_8087FB8
-sub_8087FB8: @ 8087FB8
-	push {r4-r7,lr}
-	sub sp, 0xC
-	adds r3, r0, 0
-	adds r5, r1, 0
-	cmp r5, 0
-	beq _08088012
-	ldr r0, [r5]
-	ldr r4, [r0]
-	adds r2, 0x7
-	ldr r0, [r3]
-	ldr r0, [r0, 0x4]
-	adds r7, r0, 0x7
-	cmp r2, 0
-	bge _08087FEC
-	negs r6, r2
-	adds r2, r4
-	ldr r0, =gUnknown_03005DC0
-	ldr r3, [r0]
-	cmp r2, r3
-	bge _08087FE2
-	adds r3, r2, 0
-_08087FE2:
-	movs r2, 0
-	b _08087FFC
-	.pool
-_08087FEC:
-	movs r6, 0
-	adds r0, r2, r4
-	ldr r1, =gUnknown_03005DC0
-	ldr r1, [r1]
-	subs r3, r1, r2
-	cmp r0, r1
-	bge _08087FFC
-	adds r3, r4, 0
-_08087FFC:
-	movs r0, 0
-	str r0, [sp]
-	str r3, [sp, 0x4]
-	movs r0, 0x7
-	str r0, [sp, 0x8]
-	adds r0, r2, 0
-	adds r1, r7, 0
-	adds r2, r5, 0
-	adds r3, r6, 0
-	bl sub_8087F54
-_08088012:
-	add sp, 0xC
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8087FB8
-
-	thumb_func_start sub_8088020
-sub_8088020: @ 8088020
-	push {r4-r7,lr}
-	sub sp, 0xC
-	adds r5, r1, 0
-	cmp r5, 0
-	beq _08088074
-	ldr r0, [r5]
-	ldr r4, [r0]
-	ldr r0, [r0, 0x4]
-	adds r2, 0x7
-	subs r7, r0, 0x7
-	cmp r2, 0
-	bge _08088050
-	negs r6, r2
-	adds r2, r4
-	ldr r0, =gUnknown_03005DC0
-	ldr r3, [r0]
-	cmp r2, r3
-	bge _08088046
-	adds r3, r2, 0
-_08088046:
-	movs r2, 0
-	b _08088060
-	.pool
-_08088050:
-	movs r6, 0
-	adds r0, r2, r4
-	ldr r1, =gUnknown_03005DC0
-	ldr r1, [r1]
-	subs r3, r1, r2
-	cmp r0, r1
-	bge _08088060
-	adds r3, r4, 0
-_08088060:
-	str r7, [sp]
-	str r3, [sp, 0x4]
-	movs r0, 0x7
-	str r0, [sp, 0x8]
-	adds r0, r2, 0
-	movs r1, 0
-	adds r2, r5, 0
-	adds r3, r6, 0
-	bl sub_8087F54
-_08088074:
-	add sp, 0xC
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8088020
-
-	thumb_func_start sub_8088080
-sub_8088080: @ 8088080
-	push {r4-r7,lr}
-	sub sp, 0xC
-	adds r5, r1, 0
-	cmp r5, 0
-	beq _080880D4
-	ldr r0, [r5]
-	ldr r1, [r0]
-	ldr r4, [r0, 0x4]
-	adds r2, 0x7
-	subs r7, r1, 0x7
-	cmp r2, 0
-	bge _080880B0
-	negs r6, r2
-	adds r1, r2, r4
-	ldr r0, =gUnknown_03005DC0
-	ldr r3, [r0, 0x4]
-	cmp r1, r3
-	bge _080880A6
-	adds r3, r1, 0
-_080880A6:
-	movs r2, 0
-	b _080880C0
-	.pool
-_080880B0:
-	movs r6, 0
-	adds r0, r2, r4
-	ldr r1, =gUnknown_03005DC0
-	ldr r1, [r1, 0x4]
-	subs r3, r1, r2
-	cmp r0, r1
-	bge _080880C0
-	adds r3, r4, 0
-_080880C0:
-	str r6, [sp]
-	movs r0, 0x7
-	str r0, [sp, 0x4]
-	str r3, [sp, 0x8]
-	movs r0, 0
-	adds r1, r2, 0
-	adds r2, r5, 0
-	adds r3, r7, 0
-	bl sub_8087F54
-_080880D4:
-	add sp, 0xC
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8088080
-
-	thumb_func_start sub_80880E0
-sub_80880E0: @ 80880E0
-	push {r4-r7,lr}
-	sub sp, 0xC
-	adds r3, r0, 0
-	adds r5, r1, 0
-	cmp r5, 0
-	beq _08088138
-	ldr r0, [r5]
-	ldr r4, [r0, 0x4]
-	ldr r0, [r3]
-	ldr r0, [r0]
-	adds r7, r0, 0x7
-	adds r2, 0x7
-	cmp r2, 0
-	bge _08088114
-	negs r6, r2
-	adds r1, r2, r4
-	ldr r0, =gUnknown_03005DC0
-	ldr r3, [r0, 0x4]
-	cmp r1, r3
-	bge _0808810A
-	adds r3, r1, 0
-_0808810A:
-	movs r2, 0
-	b _08088124
-	.pool
-_08088114:
-	movs r6, 0
-	adds r0, r2, r4
-	ldr r1, =gUnknown_03005DC0
-	ldr r1, [r1, 0x4]
-	subs r3, r1, r2
-	cmp r0, r1
-	bge _08088124
-	adds r3, r4, 0
-_08088124:
-	str r6, [sp]
-	movs r0, 0x8
-	str r0, [sp, 0x4]
-	str r3, [sp, 0x8]
-	adds r0, r7, 0
-	adds r1, r2, 0
-	adds r2, r5, 0
-	movs r3, 0
-	bl sub_8087F54
-_08088138:
-	add sp, 0xC
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80880E0
-
-	thumb_func_start MapGridGetZCoordAt
-@ u8 MapGridGetZCoordAt(s32 x, s32 y)
-MapGridGetZCoordAt: @ 8088144
-	push {r4,lr}
-	adds r2, r0, 0
-	adds r4, r1, 0
-	cmp r2, 0
-	blt _08088174
-	ldr r1, =gUnknown_03005DC0
-	ldr r3, [r1]
-	cmp r2, r3
-	bge _08088174
-	cmp r4, 0
-	blt _08088174
-	ldr r0, [r1, 0x4]
-	cmp r4, r0
-	bge _08088174
-	adds r0, r3, 0
-	muls r0, r4
-	adds r0, r2, r0
-	ldr r1, [r1, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	ldrh r1, [r0]
-	b _08088196
-	.pool
-_08088174:
-	ldr r0, =gMapHeader
-	ldr r3, [r0]
-	adds r1, r2, 0x1
-	movs r2, 0x1
-	ands r1, r2
-	adds r0, r4, 0x1
-	ands r0, r2
-	lsls r0, 1
-	adds r1, r0
-	ldr r0, [r3, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r1, [r1]
-	movs r2, 0xC0
-	lsls r2, 4
-	adds r0, r2, 0
-	orrs r1, r0
-_08088196:
-	ldr r0, =0x000003ff
-	cmp r1, r0
-	beq _080881A8
-	lsrs r0, r1, 12
-	b _080881AA
-	.pool
-_080881A8:
-	movs r0, 0
-_080881AA:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end MapGridGetZCoordAt
-
-	thumb_func_start MapGridIsImpassableAt
-@ u8 MapGridIsImpassableAt(s32 x, s32 y)
-MapGridIsImpassableAt: @ 80881B0
-	push {r4,lr}
-	adds r2, r0, 0
-	adds r4, r1, 0
-	cmp r2, 0
-	blt _080881E0
-	ldr r1, =gUnknown_03005DC0
-	ldr r3, [r1]
-	cmp r2, r3
-	bge _080881E0
-	cmp r4, 0
-	blt _080881E0
-	ldr r0, [r1, 0x4]
-	cmp r4, r0
-	bge _080881E0
-	adds r0, r3, 0
-	muls r0, r4
-	adds r0, r2, r0
-	ldr r1, [r1, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	ldrh r1, [r0]
-	b _08088202
-	.pool
-_080881E0:
-	ldr r0, =gMapHeader
-	ldr r3, [r0]
-	adds r1, r2, 0x1
-	movs r2, 0x1
-	ands r1, r2
-	adds r0, r4, 0x1
-	ands r0, r2
-	lsls r0, 1
-	adds r1, r0
-	ldr r0, [r3, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r1, [r1]
-	movs r2, 0xC0
-	lsls r2, 4
-	adds r0, r2, 0
-	orrs r1, r0
-_08088202:
-	ldr r0, =0x000003ff
-	cmp r1, r0
-	beq _0808821C
-	movs r0, 0xC0
-	lsls r0, 4
-	ands r1, r0
-	lsrs r0, r1, 10
-	b _0808821E
-	.pool
-_0808821C:
-	movs r0, 0x1
-_0808821E:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end MapGridIsImpassableAt
-
-	thumb_func_start MapGridGetMetatileIdAt
-@ u16 MapGridGetMetatileIdAt(s32 x, s32 y)
-MapGridGetMetatileIdAt: @ 8088224
-	push {r4-r6,lr}
-	adds r5, r0, 0
-	adds r6, r1, 0
-	cmp r5, 0
-	blt _08088254
-	ldr r1, =gUnknown_03005DC0
-	ldr r2, [r1]
-	cmp r5, r2
-	bge _08088254
-	cmp r6, 0
-	blt _08088254
-	ldr r0, [r1, 0x4]
-	cmp r6, r0
-	bge _08088254
-	adds r0, r2, 0
-	muls r0, r6
-	adds r0, r5, r0
-	ldr r1, [r1, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	ldrh r4, [r0]
-	b _08088278
-	.pool
-_08088254:
-	ldr r0, =gMapHeader
-	ldr r3, [r0]
-	adds r1, r5, 0x1
-	movs r2, 0x1
-	ands r1, r2
-	adds r0, r6, 0x1
-	ands r0, r2
-	lsls r0, 1
-	adds r1, r0
-	ldr r0, [r3, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r1, [r1]
-	movs r2, 0xC0
-	lsls r2, 4
-	adds r0, r2, 0
-	adds r4, r0, 0
-	orrs r4, r1
-_08088278:
-	ldr r0, =0x000003ff
-	cmp r4, r0
-	beq _0808828C
-	ands r4, r0
-	adds r0, r4, 0
-	b _080882B0
-	.pool
-_0808828C:
-	ldr r0, =gMapHeader
-	ldr r3, [r0]
-	adds r1, r5, 0x1
-	movs r2, 0x1
-	ands r1, r2
-	adds r0, r6, 0x1
-	ands r0, r2
-	lsls r0, 1
-	adds r1, r0
-	ldr r0, [r3, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r0, [r1]
-	movs r2, 0xC0
-	lsls r2, 4
-	adds r1, r2, 0
-	orrs r0, r1
-	ands r0, r4
-_080882B0:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end MapGridGetMetatileIdAt
-
-	thumb_func_start MapGridGetMetatileBehaviorAt
-@ u8 MapGridGetMetatileBehaviorAt(s32 x, s32 y)
-MapGridGetMetatileBehaviorAt: @ 80882BC
-	push {lr}
-	bl MapGridGetMetatileIdAt
-	lsls r0, 16
-	lsrs r0, 16
-	bl GetBehaviorByMetatileId
-	adds r1, r0, 0
-	movs r0, 0xFF
-	ands r0, r1
-	pop {r1}
-	bx r1
-	thumb_func_end MapGridGetMetatileBehaviorAt
-
-	thumb_func_start MapGridGetMetatileLayerTypeAt
-@ u8 MapGridGetMetatileLayerTypeAt(s32 x, s32 y)
-MapGridGetMetatileLayerTypeAt: @ 80882D4
-	push {lr}
-	bl MapGridGetMetatileIdAt
-	lsls r0, 16
-	lsrs r0, 16
-	bl GetBehaviorByMetatileId
-	adds r1, r0, 0
-	movs r0, 0xF0
-	lsls r0, 8
-	ands r0, r1
-	lsrs r0, 12
-	pop {r1}
-	bx r1
-	thumb_func_end MapGridGetMetatileLayerTypeAt
-
-	thumb_func_start MapGridSetMetatileIdAt
-@ void MapGridSetMetatileIdAt(s32 x, s32 y, u16 metatileId)
-MapGridSetMetatileIdAt: @ 80882F0
-	push {r4,r5,lr}
-	adds r3, r0, 0
-	lsls r2, 16
-	lsrs r5, r2, 16
-	cmp r3, 0
-	blt _08088328
-	ldr r2, =gUnknown_03005DC0
-	ldr r4, [r2]
-	cmp r3, r4
-	bge _08088328
-	cmp r1, 0
-	blt _08088328
-	ldr r0, [r2, 0x4]
-	cmp r1, r0
-	bge _08088328
-	muls r1, r4
-	adds r1, r3, r1
-	ldr r0, [r2, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r0, [r1]
-	movs r2, 0xF0
-	lsls r2, 8
-	ands r2, r0
-	ldr r0, =0x00000fff
-	ands r0, r5
-	orrs r2, r0
-	strh r2, [r1]
-_08088328:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end MapGridSetMetatileIdAt
-
-	thumb_func_start MapGridSetMetatileEntryAt
-@ void MapGridSetMetatileEntryAt(s32 x, s32 y, u16 metatileEntry)
-MapGridSetMetatileEntryAt: @ 8088338
-	push {r4,r5,lr}
-	adds r3, r0, 0
-	lsls r2, 16
-	lsrs r5, r2, 16
-	cmp r3, 0
-	blt _08088364
-	ldr r2, =gUnknown_03005DC0
-	ldr r4, [r2]
-	cmp r3, r4
-	bge _08088364
-	cmp r1, 0
-	blt _08088364
-	ldr r0, [r2, 0x4]
-	cmp r1, r0
-	bge _08088364
-	adds r0, r4, 0
-	muls r0, r1
-	adds r0, r3, r0
-	ldr r1, [r2, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	strh r5, [r0]
-_08088364:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end MapGridSetMetatileEntryAt
-
-	thumb_func_start GetBehaviorByMetatileId
-@ u16 GetBehaviorByMetatileId(u16 metatileId)
-GetBehaviorByMetatileId: @ 8088370
-	push {lr}
-	lsls r0, 16
-	lsrs r2, r0, 16
-	adds r3, r2, 0
-	ldr r0, =0x000001ff
-	cmp r2, r0
-	bhi _08088394
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r0, [r0, 0x10]
-	ldr r1, [r0, 0x10]
-	lsls r0, r2, 1
-	b _080883B2
-	.pool
-_08088394:
-	ldr r0, =0x000003ff
-	cmp r2, r0
-	bls _080883A4
-	movs r0, 0xFF
-	b _080883B6
-	.pool
-_080883A4:
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r0, [r0, 0x14]
-	ldr r1, [r0, 0x10]
-	lsls r0, r3, 1
-	adds r0, r1
-	ldr r1, =0xfffffc00
-_080883B2:
-	adds r0, r1
-	ldrh r0, [r0]
-_080883B6:
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end GetBehaviorByMetatileId
-
-	thumb_func_start save_serialize_map
-save_serialize_map: @ 80883C4
-	push {r4-r7,lr}
-	mov r7, r9
-	mov r6, r8
-	push {r6,r7}
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	adds r4, r1, 0
-	adds r4, 0x34
-	ldr r0, =gUnknown_03005DC0
-	ldr r0, [r0]
-	mov r8, r0
-	movs r0, 0
-	ldrsh r6, [r1, r0]
-	movs r2, 0x2
-	ldrsh r0, [r1, r2]
-	adds r1, r0, 0
-	adds r1, 0xE
-	cmp r0, r1
-	bge _08088420
-	mov r12, r1
-	ldr r1, =gUnknown_02032318
-	mov r9, r1
-	lsls r7, r6, 1
-_080883F2:
-	adds r1, r6, 0
-	adds r3, r1, 0
-	adds r3, 0xF
-	adds r5, r0, 0x1
-	cmp r1, r3
-	bge _0808841A
-	mov r2, r8
-	muls r2, r0
-	adds r0, r2, 0
-	lsls r0, 1
-	add r0, r9
-	adds r2, r7, r0
-	subs r1, r3, r1
-_0808840C:
-	ldrh r0, [r2]
-	strh r0, [r4]
-	adds r4, 0x2
-	adds r2, 0x2
-	subs r1, 0x1
-	cmp r1, 0
-	bne _0808840C
-_0808841A:
-	adds r0, r5, 0
-	cmp r0, r12
-	blt _080883F2
-_08088420:
-	pop {r3,r4}
-	mov r8, r3
-	mov r9, r4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end save_serialize_map
-
-	thumb_func_start sub_8088438
-sub_8088438: @ 8088438
-	push {r4,lr}
-	movs r2, 0
-	movs r1, 0
-	ldr r0, =gSaveBlock1Ptr
-	ldr r0, [r0]
-	adds r3, r0, 0
-	adds r3, 0x34
-	ldr r4, =0x000001ff
-_08088448:
-	lsls r0, r1, 1
-	adds r0, r3, r0
-	ldrh r0, [r0]
-	orrs r2, r0
-	adds r0, r1, 0x1
-	lsls r0, 16
-	lsrs r1, r0, 16
-	cmp r1, r4
-	bls _08088448
-	cmp r2, 0
-	beq _0808846C
-	movs r0, 0
-	b _0808846E
-	.pool
-_0808846C:
-	movs r0, 0x1
-_0808846E:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088438
-
-	thumb_func_start sav2_mapdata_clear
-sav2_mapdata_clear: @ 8088474
-	push {lr}
-	sub sp, 0x4
-	mov r1, sp
-	movs r0, 0
-	strh r0, [r1]
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	adds r1, 0x34
-	ldr r2, =0x01000100
-	mov r0, sp
-	bl CpuSet
-	add sp, 0x4
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sav2_mapdata_clear
-
-	thumb_func_start mapdata_from_sav2
-mapdata_from_sav2: @ 808849C
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x10
-	ldr r4, =gSaveBlock1Ptr
-	ldr r0, [r4]
-	adds r7, r0, 0
-	adds r7, 0x34
-	bl sub_8088438
-	cmp r0, 0
-	bne _080885AC
-	ldr r0, =gUnknown_03005DC0
-	ldr r0, [r0]
-	str r0, [sp]
-	ldr r0, [r4]
-	movs r2, 0
-	ldrsh r1, [r0, r2]
-	mov r10, r1
-	movs r2, 0x2
-	ldrsh r1, [r0, r2]
-	mov r8, r1
-	mov r6, r8
-	adds r0, r6, 0
-	adds r0, 0xE
-	cmp r6, r0
-	bge _0808855A
-_080884D6:
-	cmp r6, r8
-	bne _080884EC
-	cmp r6, 0
-	beq _080884EC
-	movs r0, 0
-	mov r9, r0
-	b _08088508
-	.pool
-_080884EC:
-	mov r0, r8
-	adds r0, 0xD
-	movs r1, 0xFF
-	mov r9, r1
-	cmp r6, r0
-	bne _08088508
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r0, [r0, 0x4]
-	subs r0, 0x1
-	cmp r6, r0
-	beq _08088508
-	movs r2, 0x1
-	mov r9, r2
-_08088508:
-	mov r5, r10
-	adds r0, r5, 0
-	adds r0, 0xF
-	mov r1, r8
-	adds r1, 0xE
-	str r1, [sp, 0x8]
-	adds r2, r6, 0x1
-	str r2, [sp, 0x4]
-	cmp r5, r0
-	bge _08088552
-	ldr r0, [sp]
-	lsls r3, r0, 16
-_08088520:
-	ldr r1, [sp]
-	adds r0, r1, 0
-	muls r0, r6
-	adds r0, r5, r0
-	lsls r0, 1
-	ldr r1, =gUnknown_02032318
-	adds r4, r0, r1
-	adds r0, r4, 0
-	lsrs r1, r3, 16
-	mov r2, r9
-	str r3, [sp, 0xC]
-	bl sub_8088BF0
-	lsls r0, 24
-	ldr r3, [sp, 0xC]
-	cmp r0, 0
-	bne _08088546
-	ldrh r0, [r7]
-	strh r0, [r4]
-_08088546:
-	adds r7, 0x2
-	adds r5, 0x1
-	mov r0, r10
-	adds r0, 0xF
-	cmp r5, r0
-	blt _08088520
-_08088552:
-	ldr r6, [sp, 0x4]
-	ldr r2, [sp, 0x8]
-	cmp r6, r2
-	blt _080884D6
-_0808855A:
-	mov r5, r10
-	adds r0, r5, 0
-	adds r0, 0xF
-	cmp r5, r0
-	bge _080885A8
-	mov r0, r8
-	subs r0, 0x1
-	lsls r0, 16
-	mov r9, r0
-	lsls r4, r5, 16
-	mov r0, r8
-	adds r0, 0xD
-	lsls r7, r0, 16
-_08088574:
-	mov r0, r8
-	cmp r0, 0
-	beq _08088584
-	asrs r0, r4, 16
-	mov r2, r9
-	asrs r1, r2, 16
-	bl sub_80D423C
-_08088584:
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r0, [r0, 0x4]
-	subs r0, 0x1
-	cmp r6, r0
-	bge _08088598
-	asrs r0, r4, 16
-	asrs r1, r7, 16
-	bl sub_80D42B8
-_08088598:
-	movs r0, 0x80
-	lsls r0, 9
-	adds r4, r0
-	adds r5, 0x1
-	mov r0, r10
-	adds r0, 0xF
-	cmp r5, r0
-	blt _08088574
-_080885A8:
-	bl sav2_mapdata_clear
-_080885AC:
-	add sp, 0x10
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end mapdata_from_sav2
-
-	thumb_func_start sub_80885C4
-sub_80885C4: @ 80885C4
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0xC
-	lsls r0, 24
-	lsrs r3, r0, 24
-	adds r2, r3, 0
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	adds r0, r1, 0
-	adds r0, 0x34
-	str r0, [sp, 0x4]
-	ldr r0, =gUnknown_03005DC0
-	ldr r0, [r0]
-	str r0, [sp]
-	movs r4, 0
-	mov r9, r4
-	mov r8, r4
-	movs r0, 0
-	ldrsh r6, [r1, r0]
-	str r6, [sp, 0x8]
-	movs r4, 0x2
-	ldrsh r5, [r1, r4]
-	movs r7, 0xF
-	movs r6, 0xE
-	mov r12, r6
-	cmp r3, 0x2
-	beq _0808861E
-	cmp r3, 0x2
-	bgt _08088614
-	cmp r3, 0x1
-	beq _08088626
-	b _0808863E
-	.pool
-_08088614:
-	cmp r2, 0x3
-	beq _08088630
-	cmp r2, 0x4
-	beq _08088638
-	b _0808863E
-_0808861E:
-	adds r5, 0x1
-	movs r0, 0xD
-	mov r12, r0
-	b _0808863E
-_08088626:
-	movs r1, 0x1
-	mov r8, r1
-	movs r3, 0xD
-	mov r12, r3
-	b _0808863E
-_08088630:
-	ldr r4, [sp, 0x8]
-	adds r4, 0x1
-	str r4, [sp, 0x8]
-	b _0808863C
-_08088638:
-	movs r6, 0x1
-	mov r9, r6
-_0808863C:
-	movs r7, 0xE
-_0808863E:
-	movs r1, 0
-	cmp r1, r12
-	bge _08088682
-	ldr r0, =gUnknown_02032318
-	mov r10, r0
-_08088648:
-	adds r4, r1, 0x1
-	cmp r7, 0
-	beq _0808867C
-	adds r0, r1, r5
-	ldr r3, [sp]
-	adds r2, r3, 0
-	muls r2, r0
-	add r1, r8
-	lsls r0, r1, 4
-	subs r0, r1
-	add r0, r9
-	ldr r6, [sp, 0x8]
-	adds r2, r6, r2
-	adds r3, r7, 0
-	lsls r2, 1
-	add r2, r10
-	lsls r0, 1
-	ldr r6, [sp, 0x4]
-	adds r1, r0, r6
-_0808866E:
-	ldrh r0, [r1]
-	strh r0, [r2]
-	adds r1, 0x2
-	adds r2, 0x2
-	subs r3, 0x1
-	cmp r3, 0
-	bne _0808866E
-_0808867C:
-	adds r1, r4, 0
-	cmp r1, r12
-	blt _08088648
-_08088682:
-	bl sav2_mapdata_clear
-	add sp, 0xC
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80885C4
-
-	thumb_func_start GetMapBorderIdAt
-@ u32 GetMapBorderIdAt(s32 x, s32 y)
-GetMapBorderIdAt: @ 808869C
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	cmp r4, 0
-	blt _080886D8
-	ldr r1, =gUnknown_03005DC0
-	ldr r2, [r1]
-	cmp r4, r2
-	bge _080886D8
-	cmp r5, 0
-	blt _080886D8
-	ldr r0, [r1, 0x4]
-	cmp r5, r0
-	bge _080886D8
-	adds r0, r2, 0
-	muls r0, r5
-	adds r0, r4, r0
-	ldr r1, [r1, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	ldrh r1, [r0]
-	ldr r0, =0x000003ff
-	cmp r1, r0
-	beq _08088770
-	b _08088700
-	.pool
-_080886D8:
-	ldr r0, =gMapHeader
-	ldr r3, [r0]
-	adds r1, r4, 0x1
-	movs r2, 0x1
-	ands r1, r2
-	adds r0, r5, 0x1
-	ands r0, r2
-	lsls r0, 1
-	adds r1, r0
-	ldr r0, [r3, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r1, [r1]
-	movs r2, 0xC0
-	lsls r2, 4
-	adds r0, r2, 0
-	orrs r0, r1
-	ldr r1, =0x000003ff
-	cmp r0, r1
-	beq _08088770
-_08088700:
-	ldr r1, =gUnknown_03005DC0
-	ldr r0, [r1]
-	subs r0, 0x8
-	cmp r4, r0
-	blt _0808872C
-	ldr r0, =gUnknown_02037340
-	ldrb r1, [r0]
-	movs r0, 0x8
-	ands r0, r1
-	cmp r0, 0
-	beq _08088770
-	movs r0, 0x4
-	b _08088782
-	.pool
-_0808872C:
-	cmp r4, 0x6
-	bgt _08088744
-	ldr r0, =gUnknown_02037340
-	ldrb r1, [r0]
-	movs r0, 0x4
-	ands r0, r1
-	cmp r0, 0
-	beq _08088770
-	movs r0, 0x3
-	b _08088782
-	.pool
-_08088744:
-	ldr r0, [r1, 0x4]
-	subs r0, 0x7
-	cmp r5, r0
-	blt _08088760
-	ldr r0, =gUnknown_02037340
-	ldrb r1, [r0]
-	movs r0, 0x1
-	ands r0, r1
-	cmp r0, 0
-	beq _08088770
-	movs r0, 0x1
-	b _08088782
-	.pool
-_08088760:
-	cmp r5, 0x6
-	bgt _08088780
-	ldr r0, =gUnknown_02037340
-	ldrb r1, [r0]
-	movs r0, 0x2
-	ands r0, r1
-	cmp r0, 0
-	bne _0808877C
-_08088770:
-	movs r0, 0x1
-	negs r0, r0
-	b _08088782
-	.pool
-_0808877C:
-	movs r0, 0x2
-	b _08088782
-_08088780:
-	movs r0, 0
-_08088782:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end GetMapBorderIdAt
-
-	thumb_func_start GetPostCameraMoveMapBorderId
-@ u32 GetPostCameraMoveMapBorderId(s32 deltaX, s32 deltaY)
-GetPostCameraMoveMapBorderId: @ 8088788
-	push {r4,lr}
-	adds r3, r1, 0
-	ldr r1, =gSaveBlock1Ptr
-	ldr r1, [r1]
-	movs r4, 0
-	ldrsh r2, [r1, r4]
-	adds r0, 0x7
-	adds r2, r0
-	movs r0, 0x2
-	ldrsh r1, [r1, r0]
-	adds r3, 0x7
-	adds r1, r3
-	adds r0, r2, 0
-	bl GetMapBorderIdAt
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end GetPostCameraMoveMapBorderId
-
-	thumb_func_start CanCameraMoveInDirection
-@ bool32 CanCameraMoveInDirection(u8 direction)
-CanCameraMoveInDirection: @ 80887B0
-	push {r4,r5,lr}
-	ldr r1, =gSaveBlock1Ptr
-	ldr r4, [r1]
-	movs r1, 0
-	ldrsh r3, [r4, r1]
-	ldr r2, =gUnknown_08339D64
-	lsls r0, 3
-	adds r1, r0, r2
-	ldr r1, [r1]
-	adds r1, 0x7
-	adds r3, r1
-	movs r5, 0x2
-	ldrsh r1, [r4, r5]
-	adds r2, 0x4
-	adds r0, r2
-	ldr r0, [r0]
-	adds r0, 0x7
-	adds r1, r0
-	adds r0, r3, 0
-	bl GetMapBorderIdAt
-	movs r1, 0x1
-	negs r1, r1
-	cmp r0, r1
-	beq _080887F0
-	movs r0, 0x1
-	b _080887F2
-	.pool
-_080887F0:
-	movs r0, 0
-_080887F2:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end CanCameraMoveInDirection
-
-	thumb_func_start sub_80887F8
-sub_80887F8: @ 80887F8
-	push {r4-r7,lr}
-	adds r5, r0, 0
-	adds r4, r1, 0
-	adds r6, r2, 0
-	adds r7, r3, 0
-	bl mapconnection_get_mapheader
-	adds r3, r0, 0
-	cmp r4, 0x2
-	beq _08088860
-	cmp r4, 0x2
-	bgt _08088816
-	cmp r4, 0x1
-	beq _0808884C
-	b _08088872
-_08088816:
-	cmp r4, 0x3
-	beq _08088834
-	cmp r4, 0x4
-	bne _08088872
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	negs r0, r6
-	strh r0, [r1]
-	ldr r2, [r5, 0x4]
-	ldrh r0, [r1, 0x2]
-	subs r0, r2
-	b _08088870
-	.pool
-_08088834:
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	ldr r0, [r3]
-	ldr r0, [r0]
-	strh r0, [r1]
-	ldr r2, [r5, 0x4]
-	ldrh r0, [r1, 0x2]
-	subs r0, r2
-	b _08088870
-	.pool
-_0808884C:
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	ldr r2, [r5, 0x4]
-	ldrh r0, [r1]
-	subs r0, r2
-	strh r0, [r1]
-	negs r0, r7
-	b _08088870
-	.pool
-_08088860:
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	ldr r2, [r5, 0x4]
-	ldrh r0, [r1]
-	subs r0, r2
-	strh r0, [r1]
-	ldr r0, [r3]
-	ldr r0, [r0, 0x4]
-_08088870:
-	strh r0, [r1, 0x2]
-_08088872:
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_80887F8
-
-	thumb_func_start CameraMove
-@ u8 CameraMove(s32 deltaX, s32 deltaY)
-CameraMove: @ 808887C
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	mov r10, r0
-	mov r9, r1
-	ldr r1, =gCamera
-	ldrb r0, [r1]
-	movs r1, 0x2
-	negs r1, r1
-	ands r1, r0
-	ldr r2, =gCamera
-	strb r1, [r2]
-	mov r0, r10
-	mov r1, r9
-	bl GetPostCameraMoveMapBorderId
-	adds r7, r0, 0
-	adds r0, r7, 0x1
-	cmp r0, 0x1
-	bhi _080888C4
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	ldrh r0, [r1]
-	add r0, r10
-	strh r0, [r1]
-	ldrh r0, [r1, 0x2]
-	add r0, r9
-	strh r0, [r1, 0x2]
-	b _08088932
-	.pool
-_080888C4:
-	bl save_serialize_map
-	bl sub_81BE72C
-	ldr r1, =gSaveBlock1Ptr
-	ldr r0, [r1]
-	movs r2, 0
-	ldrsh r5, [r0, r2]
-	movs r1, 0x2
-	ldrsh r6, [r0, r1]
-	lsls r2, r7, 24
-	lsrs r2, 24
-	mov r8, r2
-	mov r0, r8
-	adds r1, r5, 0
-	adds r2, r6, 0
-	bl sub_8088950
-	adds r4, r0, 0
-	adds r1, r7, 0
-	mov r2, r10
-	mov r3, r9
-	bl sub_80887F8
-	ldrb r0, [r4, 0x8]
-	ldrb r1, [r4, 0x9]
-	bl mliX_load_map
-	ldr r1, =gCamera
-	ldrb r0, [r1]
-	movs r1, 0x1
-	orrs r0, r1
-	ldr r2, =gCamera
-	strb r0, [r2]
-	ldr r0, =gSaveBlock1Ptr
-	ldr r1, [r0]
-	movs r2, 0
-	ldrsh r0, [r1, r2]
-	subs r5, r0
-	ldr r0, =gCamera
-	str r5, [r0, 0x4]
-	movs r2, 0x2
-	ldrsh r0, [r1, r2]
-	subs r6, r0
-	ldr r0, =gCamera
-	str r6, [r0, 0x8]
-	ldrh r0, [r1]
-	add r0, r10
-	strh r0, [r1]
-	ldrh r0, [r1, 0x2]
-	add r0, r9
-	strh r0, [r1, 0x2]
-	mov r0, r8
-	bl sub_80885C4
-_08088932:
-	ldr r0, =gCamera
-	ldrb r0, [r0]
-	lsls r0, 31
-	lsrs r0, 31
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end CameraMove
-
-	thumb_func_start sub_8088950
-sub_8088950: @ 8088950
-	push {r4-r7,lr}
-	mov r7, r9
-	mov r6, r8
-	push {r6,r7}
-	mov r9, r1
-	mov r8, r2
-	lsls r0, 24
-	lsrs r6, r0, 24
-	ldr r0, =gMapHeader
-	ldr r0, [r0, 0xC]
-	ldr r7, [r0]
-	ldr r4, [r0, 0x4]
-	movs r5, 0
-	cmp r5, r7
-	bge _08088998
-_0808896E:
-	ldrb r0, [r4]
-	cmp r0, r6
-	bne _08088990
-	adds r0, r6, 0
-	mov r1, r9
-	mov r2, r8
-	adds r3, r4, 0
-	bl sub_80889A8
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	bne _08088990
-	adds r0, r4, 0
-	b _0808899A
-	.pool
-_08088990:
-	adds r5, 0x1
-	adds r4, 0xC
-	cmp r5, r7
-	blt _0808896E
-_08088998:
-	movs r0, 0
-_0808899A:
-	pop {r3,r4}
-	mov r8, r3
-	mov r9, r4
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088950
-
-	thumb_func_start sub_80889A8
-sub_80889A8: @ 80889A8
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	adds r7, r1, 0
-	mov r8, r2
-	adds r5, r3, 0
-	lsls r0, 24
-	lsrs r4, r0, 24
-	adds r6, r4, 0
-	adds r0, r5, 0
-	bl mapconnection_get_mapheader
-	adds r2, r0, 0
-	cmp r4, 0x1
-	blt _08088A00
-	cmp r4, 0x2
-	bgt _080889E0
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r1, [r0]
-	ldr r0, [r2]
-	ldr r2, [r0]
-	ldr r3, [r5, 0x4]
-	adds r0, r7, 0
-	b _080889F2
-	.pool
-_080889E0:
-	cmp r6, 0x4
-	bgt _08088A00
-	ldr r0, =gMapHeader
-	ldr r0, [r0]
-	ldr r1, [r0, 0x4]
-	ldr r0, [r2]
-	ldr r2, [r0, 0x4]
-	ldr r3, [r5, 0x4]
-	mov r0, r8
-_080889F2:
-	bl sub_8088A0C
-	lsls r0, 24
-	lsrs r0, 24
-	b _08088A02
-	.pool
-_08088A00:
-	movs r0, 0
-_08088A02:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_80889A8
-
-	thumb_func_start sub_8088A0C
-sub_8088A0C: @ 8088A0C
-	push {r4,lr}
-	adds r4, r0, 0
-	adds r0, r2, 0
-	adds r2, r3, 0
-	cmp r3, 0
-	bge _08088A1A
-	movs r3, 0
-_08088A1A:
-	adds r2, r0, r2
-	cmp r2, r1
-	bge _08088A22
-	adds r1, r2, 0
-_08088A22:
-	cmp r3, r4
-	bgt _08088A2E
-	cmp r4, r1
-	bgt _08088A2E
-	movs r0, 0x1
-	b _08088A30
-_08088A2E:
-	movs r0, 0
-_08088A30:
-	pop {r4}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088A0C
-
-	thumb_func_start sub_8088A38
-sub_8088A38: @ 8088A38
-	push {lr}
-	cmp r0, 0
-	blt _08088A46
-	cmp r0, r1
-	bge _08088A46
-	movs r0, 0x1
-	b _08088A48
-_08088A46:
-	movs r0, 0
-_08088A48:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088A38
-
-	thumb_func_start sub_8088A4C
-sub_8088A4C: @ 8088A4C
-	push {r4-r6,lr}
-	adds r4, r0, 0
-	adds r5, r1, 0
-	adds r6, r2, 0
-	bl mapconnection_get_mapheader
-	adds r1, r0, 0
-	ldrb r0, [r4]
-	cmp r0, 0x1
-	blt _08088A84
-	cmp r0, 0x2
-	bgt _08088A72
-	ldr r0, [r4, 0x4]
-	subs r0, r5, r0
-	ldr r1, [r1]
-	ldr r1, [r1]
-	bl sub_8088A38
-	b _08088A86
-_08088A72:
-	cmp r0, 0x4
-	bgt _08088A84
-	ldr r0, [r4, 0x4]
-	subs r0, r6, r0
-	ldr r1, [r1]
-	ldr r1, [r1, 0x4]
-	bl sub_8088A38
-	b _08088A86
-_08088A84:
-	movs r0, 0
-_08088A86:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088A4C
-
-	thumb_func_start sub_8088A8C
-sub_8088A8C: @ 8088A8C
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	lsls r0, 16
-	lsrs r0, 16
-	mov r8, r0
-	lsls r1, 16
-	lsrs r1, 16
-	ldr r2, =gMapHeader
-	ldr r0, [r2, 0xC]
-	cmp r0, 0
-	bne _08088AB4
-	b _08088B2A
-	.pool
-_08088AB0:
-	adds r0, r4, 0
-	b _08088B2C
-_08088AB4:
-	ldr r7, [r0]
-	ldr r4, [r0, 0x4]
-	movs r6, 0
-	cmp r6, r7
-	bge _08088B2A
-	lsls r0, r1, 16
-	asrs r5, r0, 16
-	mov r9, r2
-	mov r1, r8
-	lsls r0, r1, 16
-	asrs r0, 16
-	mov r10, r0
-_08088ACC:
-	ldrb r1, [r4]
-	adds r3, r1, 0
-	subs r0, r1, 0x5
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	bls _08088B22
-	cmp r1, 0x2
-	bne _08088AE2
-	cmp r5, 0x6
-	bgt _08088B22
-_08088AE2:
-	cmp r1, 0x1
-	bne _08088AF2
-	mov r2, r9
-	ldr r0, [r2]
-	ldr r0, [r0, 0x4]
-	adds r0, 0x7
-	cmp r5, r0
-	blt _08088B22
-_08088AF2:
-	mov r0, r8
-	lsls r2, r0, 16
-	cmp r1, 0x3
-	bne _08088B00
-	mov r1, r10
-	cmp r1, 0x6
-	bgt _08088B22
-_08088B00:
-	cmp r3, 0x4
-	bne _08088B12
-	asrs r1, r2, 16
-	mov r3, r9
-	ldr r0, [r3]
-	ldr r0, [r0]
-	adds r0, 0x7
-	cmp r1, r0
-	blt _08088B22
-_08088B12:
-	asrs r1, r2, 16
-	subs r1, 0x7
-	adds r0, r4, 0
-	subs r2, r5, 0x7
-	bl sub_8088A4C
-	cmp r0, 0x1
-	beq _08088AB0
-_08088B22:
-	adds r6, 0x1
-	adds r4, 0xC
-	cmp r6, r7
-	blt _08088ACC
-_08088B2A:
-	movs r0, 0
-_08088B2C:
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088A8C
-
-	thumb_func_start sub_8088B3C
-sub_8088B3C: @ 8088B3C
-	lsls r0, 16
-	lsrs r0, 16
-	lsls r1, 16
-	lsrs r1, 16
-	ldr r2, =gSaveBlock1Ptr
-	ldr r2, [r2]
-	subs r0, 0x7
-	strh r0, [r2]
-	subs r1, 0x7
-	strh r1, [r2, 0x2]
-	bx lr
-	.pool
-	thumb_func_end sub_8088B3C
-
-	thumb_func_start sav1_camera_get_focus_coords
-sav1_camera_get_focus_coords: @ 8088B58
-	ldr r2, =gSaveBlock1Ptr
-	ldr r3, [r2]
-	ldrh r2, [r3]
-	adds r2, 0x7
-	strh r2, [r0]
-	ldrh r0, [r3, 0x2]
-	adds r0, 0x7
-	strh r0, [r1]
-	bx lr
-	.pool
-	thumb_func_end sav1_camera_get_focus_coords
-
-	thumb_func_start SetCameraCoords
-@ void SetCameraCoords(u16 x, u16 y)
-SetCameraCoords: @ 8088B70
-	ldr r2, =gSaveBlock1Ptr
-	ldr r2, [r2]
-	strh r0, [r2]
-	strh r1, [r2, 0x2]
-	bx lr
-	.pool
-	thumb_func_end SetCameraCoords
-
-	thumb_func_start GetCameraCoords
-@ void GetCameraCoords(u16 *x, u16 *y)
-GetCameraCoords: @ 8088B80
-	ldr r2, =gSaveBlock1Ptr
-	ldr r3, [r2]
-	ldrh r2, [r3]
-	strh r2, [r0]
-	ldrh r0, [r3, 0x2]
-	strh r0, [r1]
-	bx lr
-	.pool
-	thumb_func_end GetCameraCoords
-
-	thumb_func_start sub_8088B94
-sub_8088B94: @ 8088B94
-	push {r4,r5,lr}
-	adds r4, r0, 0
-	adds r3, r1, 0
-	adds r5, r2, 0
-	cmp r4, 0
-	blt _08088BE6
-	ldr r2, =gUnknown_03005DC0
-	ldr r1, [r2]
-	cmp r4, r1
-	bge _08088BE6
-	cmp r3, 0
-	blt _08088BE6
-	ldr r0, [r2, 0x4]
-	cmp r3, r0
-	bge _08088BE6
-	cmp r5, 0
-	beq _08088BD4
-	adds r0, r1, 0
-	muls r0, r3
-	adds r0, r4, r0
-	ldr r1, [r2, 0x8]
-	lsls r0, 1
-	adds r0, r1
-	ldrh r1, [r0]
-	movs r3, 0xC0
-	lsls r3, 4
-	adds r2, r3, 0
-	orrs r1, r2
-	strh r1, [r0]
-	b _08088BE6
-	.pool
-_08088BD4:
-	muls r1, r3
-	adds r1, r4, r1
-	ldr r0, [r2, 0x8]
-	lsls r1, 1
-	adds r1, r0
-	ldrh r2, [r1]
-	ldr r0, =0x0000f3ff
-	ands r0, r2
-	strh r0, [r1]
-_08088BE6:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_8088B94
-
-	thumb_func_start sub_8088BF0
-sub_8088BF0: @ 8088BF0
-	push {lr}
-	adds r3, r0, 0
-	lsls r1, 16
-	lsrs r0, r1, 16
-	adds r1, r0, 0
-	lsls r2, 24
-	lsrs r2, 24
-	cmp r2, 0xFF
-	beq _08088C24
-	cmp r2, 0
-	bne _08088C0C
-	lsls r0, 1
-	subs r3, r0
-	b _08088C10
-_08088C0C:
-	lsls r0, r1, 1
-	adds r3, r0
-_08088C10:
-	ldrh r1, [r3]
-	ldr r0, =0x000003ff
-	ands r0, r1
-	adds r1, r2, 0
-	bl sub_80FADE4
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	beq _08088C2C
-_08088C24:
-	movs r0, 0
-	b _08088C2E
-	.pool
-_08088C2C:
-	movs r0, 0x1
-_08088C2E:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8088BF0
-
-	thumb_func_start copy_tileset_patterns_to_vram
-@ void copy_tileset_patterns_to_vram(tileset *tileset, int num_tiles, int offset)
-copy_tileset_patterns_to_vram: @ 8088C34
-	push {r4-r7,lr}
-	sub sp, 0x4
-	adds r3, r0, 0
-	lsls r1, 16
-	lsrs r4, r1, 16
-	adds r6, r4, 0
-	lsls r2, 16
-	lsrs r5, r2, 16
-	adds r7, r5, 0
-	cmp r3, 0
-	beq _08088C70
-	ldrb r0, [r3]
-	cmp r0, 0
-	bne _08088C60
-	ldr r1, [r3, 0x4]
-	lsls r2, r4, 21
-	lsrs r2, 16
-	movs r0, 0x2
-	adds r3, r5, 0
-	bl LoadBgTiles
-	b _08088C70
-_08088C60:
-	ldr r1, [r3, 0x4]
-	lsls r2, r6, 5
-	movs r0, 0
-	str r0, [sp]
-	movs r0, 0x2
-	adds r3, r7, 0
-	bl decompress_and_copy_tile_data_to_vram
-_08088C70:
-	add sp, 0x4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end copy_tileset_patterns_to_vram
-
-	thumb_func_start copy_tileset_patterns_to_vram2
-@ void copy_tileset_patterns_to_vram2(tileset *tileset, int num_tiles, int offset)
-copy_tileset_patterns_to_vram2: @ 8088C78
-	push {r4-r7,lr}
-	sub sp, 0x4
-	adds r3, r0, 0
-	lsls r1, 16
-	lsrs r4, r1, 16
-	adds r6, r4, 0
-	lsls r2, 16
-	lsrs r5, r2, 16
-	adds r7, r5, 0
-	cmp r3, 0
-	beq _08088CB4
-	ldrb r0, [r3]
-	cmp r0, 0
-	bne _08088CA4
-	ldr r1, [r3, 0x4]
-	lsls r2, r4, 21
-	lsrs r2, 16
-	movs r0, 0x2
-	adds r3, r5, 0
-	bl LoadBgTiles
-	b _08088CB4
-_08088CA4:
-	ldr r1, [r3, 0x4]
-	lsls r2, r6, 5
-	movs r0, 0
-	str r0, [sp]
-	movs r0, 0x2
-	adds r3, r7, 0
-	bl copy_decompressed_tile_data_to_vram_autofree
-_08088CB4:
-	add sp, 0x4
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end copy_tileset_patterns_to_vram2
-
-	thumb_func_start nullsub_3
-nullsub_3: @ 8088CBC
-	bx lr
-	thumb_func_end nullsub_3
-
-	thumb_func_start nullsub_90
-nullsub_90: @ 8088CC0
-	bx lr
-	thumb_func_end nullsub_90
-
-	thumb_func_start apply_map_tileset_palette
-@ void apply_map_tileset_palette(tileset *tileset, int dest_offset, int size)
-apply_map_tileset_palette: @ 8088CC4
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	adds r4, r0, 0
-	lsls r1, 16
-	lsrs r5, r1, 16
-	mov r8, r5
-	lsls r6, r2, 16
-	lsrs r7, r6, 16
-	adds r2, r7, 0
-	movs r1, 0
-	mov r0, sp
-	strh r1, [r0]
-	cmp r4, 0
-	beq _08088D42
-	ldrb r0, [r4, 0x1]
-	cmp r0, 0
-	bne _08088D18
-	mov r0, sp
-	adds r1, r5, 0
-	movs r2, 0x2
-	bl LoadPalette
-	ldr r0, [r4, 0x8]
-	adds r0, 0x2
-	adds r5, 0x1
-	lsls r5, 16
-	lsrs r5, 16
-	subs r4, r7, 0x2
-	lsls r2, r4, 16
-	lsrs r2, 16
-	adds r1, r5, 0
-	bl LoadPalette
-	lsls r4, 15
-	lsrs r4, 16
-	adds r0, r5, 0
-	adds r1, r4, 0
-	bl nullsub_3
-	b _08088D42
-_08088D18:
-	cmp r0, 0x1
-	bne _08088D32
-	ldr r0, [r4, 0x8]
-	adds r0, 0xC0
-	adds r1, r5, 0
-	adds r2, r7, 0
-	bl LoadPalette
-	lsrs r1, r6, 17
-	adds r0, r5, 0
-	bl nullsub_3
-	b _08088D42
-_08088D32:
-	ldr r0, [r4, 0x8]
-	mov r1, r8
-	bl LoadCompressedPalette
-	lsrs r1, r6, 17
-	mov r0, r8
-	bl nullsub_3
-_08088D42:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end apply_map_tileset_palette
-
-	thumb_func_start copy_map_tileset1_to_vram
-@ void copy_map_tileset1_to_vram(mapdata_header *a1)
-copy_map_tileset1_to_vram: @ 8088D50
-	push {lr}
-	ldr r0, [r0, 0x10]
-	movs r1, 0x80
-	lsls r1, 2
-	movs r2, 0
-	bl copy_tileset_patterns_to_vram
-	pop {r0}
-	bx r0
-	thumb_func_end copy_map_tileset1_to_vram
-
-	thumb_func_start copy_map_tileset2_to_vram
-@ void copy_map_tileset2_to_vram(mapdata_header *a1)
-copy_map_tileset2_to_vram: @ 8088D64
-	push {lr}
-	ldr r0, [r0, 0x14]
-	movs r2, 0x80
-	lsls r2, 2
-	adds r1, r2, 0
-	bl copy_tileset_patterns_to_vram
-	pop {r0}
-	bx r0
-	thumb_func_end copy_map_tileset2_to_vram
-
-	thumb_func_start copy_map_tileset2_to_vram_2
-@ void copy_map_tileset2_to_vram_2(mapdata_header *a1)
-copy_map_tileset2_to_vram_2: @ 8088D78
-	push {lr}
-	ldr r0, [r0, 0x14]
-	movs r2, 0x80
-	lsls r2, 2
-	adds r1, r2, 0
-	bl copy_tileset_patterns_to_vram2
-	pop {r0}
-	bx r0
-	thumb_func_end copy_map_tileset2_to_vram_2
-
-	thumb_func_start apply_map_tileset1_palette
-@ void apply_map_tileset1_palette(mapdata_header *a1)
-apply_map_tileset1_palette: @ 8088D8C
-	push {lr}
-	ldr r0, [r0, 0x10]
-	movs r1, 0
-	movs r2, 0xC0
-	bl apply_map_tileset_palette
-	pop {r0}
-	bx r0
-	thumb_func_end apply_map_tileset1_palette
-
-	thumb_func_start apply_map_tileset2_palette
-@ void apply_map_tileset2_palette(mapdata_header *a1)
-apply_map_tileset2_palette: @ 8088D9C
-	push {lr}
-	ldr r0, [r0, 0x14]
-	movs r1, 0x60
-	movs r2, 0xE0
-	bl apply_map_tileset_palette
-	pop {r0}
-	bx r0
-	thumb_func_end apply_map_tileset2_palette
-
-	thumb_func_start copy_map_tileset1_tileset2_to_vram
-@ void copy_map_tileset1_tileset2_to_vram(mapdata_header *a1)
-copy_map_tileset1_tileset2_to_vram: @ 8088DAC
-	push {r4,r5,lr}
-	adds r5, r0, 0
-	cmp r5, 0
-	beq _08088DCC
-	ldr r0, [r5, 0x10]
-	movs r4, 0x80
-	lsls r4, 2
-	adds r1, r4, 0
-	movs r2, 0
-	bl copy_tileset_patterns_to_vram2
-	ldr r0, [r5, 0x14]
-	adds r1, r4, 0
-	adds r2, r4, 0
-	bl copy_tileset_patterns_to_vram2
-_08088DCC:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	thumb_func_end copy_map_tileset1_tileset2_to_vram
-
-	thumb_func_start apply_map_tileset1_tileset2_palette
-@ void apply_map_tileset1_tileset2_palette(mapdata_header *a1)
-apply_map_tileset1_tileset2_palette: @ 8088DD4
-	push {r4,lr}
-	adds r4, r0, 0
-	cmp r4, 0
-	beq _08088DE6
-	bl apply_map_tileset1_palette
-	adds r0, r4, 0
-	bl apply_map_tileset2_palette
-_08088DE6:
-	pop {r4}
-	pop {r0}
-	bx r0
-	thumb_func_end apply_map_tileset1_tileset2_palette
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/common_syms/field_camera.txt b/common_syms/field_camera.txt
new file mode 100644
index 000000000..615026aee
--- /dev/null
+++ b/common_syms/field_camera.txt
@@ -0,0 +1,3 @@
+gUnknown_03005DD0
+gUnknown_03005DE8
+gUnknown_03005DEC
diff --git a/common_syms/fieldmap.txt b/common_syms/fieldmap.txt
new file mode 100644
index 000000000..49e0fb980
--- /dev/null
+++ b/common_syms/fieldmap.txt
@@ -0,0 +1 @@
+gUnknown_03005DC0
diff --git a/data/fieldmap.s b/data/fieldmap.s
deleted file mode 100644
index 1daa3efdf..000000000
--- a/data/fieldmap.s
+++ /dev/null
@@ -1,8 +0,0 @@
-    .include "asm/macros.inc"
-    .include "constants/constants.inc"
-
-    .section .rodata
-    .align 2, 0
-
-gUnknown_08486EF8:: @ 8486EF8
-	.4byte 0x00000000
diff --git a/include/battle_frontier_2.h b/include/battle_frontier_2.h
index 638ff692e..3f8f8049d 100644
--- a/include/battle_frontier_2.h
+++ b/include/battle_frontier_2.h
@@ -7,5 +7,6 @@ u16 sub_81A89A0(u8);
 void sub_81A8AF8(void);
 bool8 InBattlePike(void);
 void sub_819FA50(void);
+void sub_81AA078(u16*, u8);
 
 #endif // GUARD_BATTLE_FRONTIER_2_H
diff --git a/include/fieldmap.h b/include/fieldmap.h
index 3128e95ce..6e127ce5d 100644
--- a/include/fieldmap.h
+++ b/include/fieldmap.h
@@ -1,22 +1,31 @@
 #ifndef GUARD_FIELDMAP_H
 #define GUARD_FIELDMAP_H
 
-extern struct MapCoords {
-    int width;
-    int height;
-} gUnknown_03005DC0;
+extern struct BackupMapData gUnknown_03005DC0;
 
 u32 MapGridGetMetatileIdAt(int, int);
 u32 MapGridGetMetatileBehaviorAt(int, int);
 void MapGridSetMetatileIdAt(int, int, u16);
 void MapGridSetMetatileEntryAt(int, int, u16);
 void GetCameraCoords(u16*, u16*);
-bool8 MapGridIsImpassableAt(s16, s16);
-s32 GetMapBorderIdAt(s16, s16);
-bool32 CanCameraMoveInDirection(u8);
+bool8 MapGridIsImpassableAt(int, int);
+int GetMapBorderIdAt(int x, int y);
+int CanCameraMoveInDirection(int direction);
 u16 GetBehaviorByMetatileId(u16 metatileId);
 void sav1_camera_get_focus_coords(u16 *x, u16 *y);
 u8 MapGridGetMetatileLayerTypeAt(s32 x, s32 y);
 u8 CameraMove(s32 deltaX, s32 deltaY);
+void mapheader_copy_mapdata_with_padding(struct MapHeader *mapHeader);
+void map_copy_with_padding(u16 *map, u16 width, u16 height);
+void mapheader_copy_mapdata_of_adjacent_maps(struct MapHeader *);
+void fillSouthConnection(struct MapHeader const *, struct MapHeader const *, s32);
+void fillNorthConnection(struct MapHeader const *, struct MapHeader const *, s32);
+void fillWestConnection(struct MapHeader const *, struct MapHeader const *, s32);
+void fillEastConnection(struct MapHeader const *, struct MapHeader const *, s32);
+void mapdata_from_sav2(void);
+bool8 sub_8088BF0(u16*, u16, u8);
+struct MapConnection *sub_8088950(u8 direction, int x, int y);
+bool8 sub_80889A8(u8 direction, int x, int y, struct MapConnection *connection);
+bool8 sub_8088A0C(int x, int src_width, int dest_width, int offset);
 
 #endif //GUARD_FIELDMAP_H
diff --git a/include/fldeff_80F9BCC.h b/include/fldeff_80F9BCC.h
index d57665c68..84015065e 100644
--- a/include/fldeff_80F9BCC.h
+++ b/include/fldeff_80F9BCC.h
@@ -10,5 +10,6 @@
 void sub_80FA5E4(s16 id, s16 x, s16 y);
 void sub_80FA794(s16 x, s16 y);
 void overworld_poison_effect(void);
+bool8 sub_80FADE4(u16, u8);
 
 #endif //GUARD_FLDEFF_80F9BCC_H
diff --git a/include/fldeff_cut.h b/include/fldeff_cut.h
new file mode 100644
index 000000000..f985fd82d
--- /dev/null
+++ b/include/fldeff_cut.h
@@ -0,0 +1,7 @@
+#ifndef GUARD_FLDEFF_CUT_H
+#define GUARD_FLDEFF_CUT_H
+
+void sub_80D423C(s16, s16);
+void sub_80D42B8(s16, s16);
+
+#endif // GUARD_FLDEFF_CUT_H
diff --git a/include/fldeff_groundshake.h b/include/fldeff_groundshake.h
new file mode 100644
index 000000000..c1629f9bd
--- /dev/null
+++ b/include/fldeff_groundshake.h
@@ -0,0 +1,6 @@
+#ifndef GUARD_FLDEFF_GROUNDSHAKE_H
+#define GUARD_FLDEFF_GROUNDSHAKE_H
+
+void sub_81BE72C(void);
+
+#endif // GUARD_FLDEFF_GROUNDSHAKE_H
diff --git a/include/overworld.h b/include/overworld.h
index cd0f4e60f..59d4d6a30 100644
--- a/include/overworld.h
+++ b/include/overworld.h
@@ -44,8 +44,8 @@ void ApplyCurrentWarp(void);
 void set_warp2_warp3_to_neg_1(void);
 void SetWarpData(struct WarpData *warp, s8 mapGroup, s8 mapNum, s8 warpId, s8 x, s8 y);
 bool32 warp_data_is_not_neg_1(struct WarpData *warp);
-const struct MapHeader *Overworld_GetMapHeaderByGroupAndId(u16 mapGroup, u16 mapNum);
-const struct MapHeader *warp1_get_mapheader(void);
+struct MapHeader const *const Overworld_GetMapHeaderByGroupAndId(u16 mapGroup, u16 mapNum);
+struct MapHeader const *const warp1_get_mapheader(void);
 void set_current_map_header_from_sav1_save_old_name(void);
 void LoadSaveblockMapHeader(void);
 void update_camera_pos_from_warpid(void);
diff --git a/include/pokenav.h b/include/pokenav.h
index fabe211ea..42affc938 100644
--- a/include/pokenav.h
+++ b/include/pokenav.h
@@ -20,6 +20,7 @@ void sub_81D1E90(struct PlayerPCItemPageStruct *);
 void sub_81D1EC0(void);
 void sub_81D1D04(u8);
 bool8 sub_81D1C44(u8);
+void sub_81D5FB4(u16*);
 
 
 #endif //GUARD_POKENAV_H
diff --git a/include/secret_base.h b/include/secret_base.h
index b2502889c..173efef09 100644
--- a/include/secret_base.h
+++ b/include/secret_base.h
@@ -10,5 +10,7 @@ void sub_80E9578(void);
 void sub_80E980C(void);
 u8 *GetSecretBaseMapName(u8 *dest);
 const u8 *GetSecretBaseTrainerLoseText(void);
+void sub_80E8EE0(struct MapEvents const *events);
+void sub_80E9238(u8 flagIn);
 
 #endif //GUARD_SECRET_BASE_H
diff --git a/include/tv.h b/include/tv.h
index 19c900ba8..1e05a680e 100644
--- a/include/tv.h
+++ b/include/tv.h
@@ -45,5 +45,6 @@ void PutPokemonTodayCaughtOnAir(void);
 void TV_PutSecretBaseVisitOnTheAir(void);
 bool8 Put3CheersForPokeblocksOnTheAir(const u8 *partnersName, u8 flavor, u8 unused, u8 sheen, u8 language);
 void PutBattleUpdateOnTheAir(u8 opponentLinkPlayerId, u16 move, u16 speciesPlayer, u16 speciesOpponent);
+void UpdateTVScreensOnMap(int, int);
 
 #endif //GUARD_TV_H
diff --git a/ld_script.txt b/ld_script.txt
index 2832bcada..e8b6951a7 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -87,7 +87,7 @@ SECTIONS {
         src/play_time.o(.text);
         src/new_game.o(.text);
         src/overworld.o(.text);
-        asm/fieldmap.o(.text);
+        src/fieldmap.o(.text);
         src/metatile_behavior.o(.text);
         src/field_camera.o(.text);
         src/field_door.o(.text);
@@ -396,7 +396,7 @@ SECTIONS {
         src/overworld.o(.rodata);
         data/tilesets.o(.rodata);
         data/maps.o(.rodata);
-        data/fieldmap.o(.rodata);
+        src/fieldmap.o(.rodata);
         src/metatile_behavior.o(.rodata);
         src/field_door.o(.rodata);
         data/field_player_avatar.o(.rodata);
diff --git a/src/field_camera.c b/src/field_camera.c
index f653e0bf1..95167ee10 100644
--- a/src/field_camera.c
+++ b/src/field_camera.c
@@ -12,6 +12,8 @@
 #include "sprite.h"
 #include "text.h"
 
+EWRAM_DATA bool8 gUnusedBikeCameraAheadPanback = FALSE;
+
 // Static type declarations
 struct FieldCameraUnknownStruct
 {
@@ -40,6 +42,10 @@ static IWRAM_DATA s16 gUnknown_03000E2A;
 static IWRAM_DATA u8 gUnknown_03000E2C;
 static IWRAM_DATA void (*gUnknown_03000E30)(void);
 
+struct CameraObject gUnknown_03005DD0;
+u16 gUnknown_03005DE8;
+u16 gUnknown_03005DEC;
+
 // text
 static void move_tilemap_camera_to_upper_left_corner_(struct FieldCameraUnknownStruct *a)
 {
diff --git a/src/fieldmap.c b/src/fieldmap.c
new file mode 100644
index 000000000..87e493e95
--- /dev/null
+++ b/src/fieldmap.c
@@ -0,0 +1,1034 @@
+#include "global.h"
+#include "overworld.h"
+#include "bg.h"
+#include "battle_frontier_2.h"
+#include "constants/RGB.h"
+#include "fieldmap.h"
+#include "fldeff_80F9BCC.h"
+#include "fldeff_cut.h"
+#include "fldeff_groundshake.h"
+#include "menu.h"
+#include "palette.h"
+#include "pokenav.h"
+#include "script.h"
+#include "secret_base.h"
+#include "tv.h"
+
+struct ConnectionFlags
+{
+    u8 south:1;
+    u8 north:1;
+    u8 west:1;
+    u8 east:1;
+};
+
+EWRAM_DATA static u16 gUnknown_02032318[0x2800] = {0};
+EWRAM_DATA struct MapHeader gMapHeader = {0};
+EWRAM_DATA struct Camera gCamera = {0};
+EWRAM_DATA static struct ConnectionFlags gUnknown_02037340 = {0};
+EWRAM_DATA static u32 sFiller_02037344 = 0; // without this, the next file won't align properly
+
+struct BackupMapData gUnknown_03005DC0;
+
+static const struct ConnectionFlags sDummyConnectionFlags = {0};
+
+struct MapHeader const *const mapconnection_get_mapheader(struct MapConnection *connection)
+{
+    return Overworld_GetMapHeaderByGroupAndId(connection->mapGroup, connection->mapNum);
+}
+
+void not_trainer_hill_battle_pyramid(void)
+{
+    mapheader_copy_mapdata_with_padding(&gMapHeader);
+    sub_80E8EE0(gMapHeader.events);
+    mapheader_run_script_with_tag_x1();
+}
+
+void sub_8087D74(void)
+{
+    mapheader_copy_mapdata_with_padding(&gMapHeader);
+    sub_80E9238(0);
+    sub_80E8EE0(gMapHeader.events);
+    mapdata_from_sav2();
+    mapheader_run_script_with_tag_x1();
+    UpdateTVScreensOnMap(gUnknown_03005DC0.width, gUnknown_03005DC0.height);
+}
+
+void battle_pyramid_map_load_related(u8 a0)
+{
+    CpuFastFill(0x03ff03ff, gUnknown_02032318, sizeof(gUnknown_02032318));
+    sub_81AA078(gUnknown_02032318, a0);
+}
+
+void trainer_hill_map_load_related(void)
+{
+    CpuFastFill(0x03ff03ff, gUnknown_02032318, sizeof(gUnknown_02032318));
+    sub_81D5FB4(gUnknown_02032318);
+}
+
+void mapheader_copy_mapdata_with_padding(struct MapHeader *mapHeader)
+{
+    struct MapData const *mapData;
+    int width;
+    int height;
+    mapData = mapHeader->mapData;
+    CpuFastFill16(0x03ff, gUnknown_02032318, sizeof(gUnknown_02032318));
+    gUnknown_03005DC0.map = gUnknown_02032318;
+    width = mapData->width + 15;
+    gUnknown_03005DC0.width = width;
+    height = mapData->height + 14;
+    gUnknown_03005DC0.height = height;
+    if (width * height <= 0x2800)
+    {
+        map_copy_with_padding(mapData->map, mapData->width, mapData->height);
+        mapheader_copy_mapdata_of_adjacent_maps(mapHeader);
+    }
+}
+
+void map_copy_with_padding(u16 *map, u16 width, u16 height)
+{
+    u16 *dest;
+    int y;
+    dest = gUnknown_03005DC0.map;
+    dest += gUnknown_03005DC0.width * 7 + 7;
+    for (y = 0; y < height; y++)
+    {
+        CpuCopy16(map, dest, width * 2);
+        dest += width + 0xf;
+        map += width;
+    }
+}
+
+void mapheader_copy_mapdata_of_adjacent_maps(struct MapHeader *mapHeader)
+{
+    int count;
+    struct MapConnection *connection;
+    int i;
+
+    if (mapHeader->connections)
+    {
+        count = mapHeader->connections->count;
+        connection = mapHeader->connections->connections;
+
+        gUnknown_02037340 = sDummyConnectionFlags;
+        for (i = 0; i < count; i++, connection++)
+        {
+            struct MapHeader const *cMap = mapconnection_get_mapheader(connection);
+            u32 offset = connection->offset;
+
+            switch (connection->direction)
+            {
+            case CONNECTION_SOUTH:
+                fillSouthConnection(mapHeader, cMap, offset);
+                gUnknown_02037340.south = 1;
+                break;
+            case CONNECTION_NORTH:
+                fillNorthConnection(mapHeader, cMap, offset);
+                gUnknown_02037340.north = 1;
+                break;
+            case CONNECTION_WEST:
+                fillWestConnection(mapHeader, cMap, offset);
+                gUnknown_02037340.west = 1;
+                break;
+            case CONNECTION_EAST:
+                fillEastConnection(mapHeader, cMap, offset);
+                gUnknown_02037340.east = 1;
+                break;
+            }
+        }
+    }
+}
+
+void sub_8087F54(int x, int y, struct MapHeader const *mapHeader, int x2, int y2, int width, int height)
+{
+    int i;
+    u16 *src;
+    u16 *dest;
+    int mapWidth;
+
+    mapWidth = mapHeader->mapData->width;
+    src = &mapHeader->mapData->map[mapWidth * y2 + x2];
+    dest = &gUnknown_03005DC0.map[gUnknown_03005DC0.width * y + x];
+
+    for (i = 0; i < height; i++)
+    {
+        CpuCopy16(src, dest, width * 2);
+        dest += gUnknown_03005DC0.width;
+        src += mapWidth;
+    }
+}
+
+void fillSouthConnection(struct MapHeader const *mapHeader, struct MapHeader const *connectedMapHeader, s32 offset)
+{
+    int x, y;
+    int x2;
+    int width;
+    int cWidth;
+
+    if (connectedMapHeader)
+    {
+        cWidth = connectedMapHeader->mapData->width;
+        x = offset + 7;
+        y = mapHeader->mapData->height + 7;
+        if (x < 0)
+        {
+            x2 = -x;
+            x += cWidth;
+            if (x < gUnknown_03005DC0.width)
+            {
+                width = x;
+            }
+            else
+            {
+                width = gUnknown_03005DC0.width;
+            }
+            x = 0;
+        }
+        else
+        {
+            x2 = 0;
+            if (x + cWidth < gUnknown_03005DC0.width)
+            {
+                width = cWidth;
+            }
+            else
+            {
+                width = gUnknown_03005DC0.width - x;
+            }
+        }
+
+        sub_8087F54(
+            x, y,
+            connectedMapHeader,
+            x2, /*y2*/ 0,
+            width, /*height*/ 7);
+    }
+}
+
+void fillNorthConnection(struct MapHeader const *mapHeader, struct MapHeader const *connectedMapHeader, s32 offset)
+{
+    int x;
+    int x2, y2;
+    int width;
+    int cWidth, cHeight;
+
+    if (connectedMapHeader)
+    {
+        cWidth = connectedMapHeader->mapData->width;
+        cHeight = connectedMapHeader->mapData->height;
+        x = offset + 7;
+        y2 = cHeight - 7;
+        if (x < 0)
+        {
+            x2 = -x;
+            x += cWidth;
+            if (x < gUnknown_03005DC0.width)
+            {
+                width = x;
+            }
+            else
+            {
+                width = gUnknown_03005DC0.width;
+            }
+            x = 0;
+        }
+        else
+        {
+            x2 = 0;
+            if (x + cWidth < gUnknown_03005DC0.width)
+            {
+                width = cWidth;
+            }
+            else
+            {
+                width = gUnknown_03005DC0.width - x;
+            }
+        }
+
+        sub_8087F54(
+            x, /*y*/ 0,
+            connectedMapHeader,
+            x2, y2,
+            width, /*height*/ 7);
+
+    }
+}
+
+void fillWestConnection(struct MapHeader const *mapHeader, struct MapHeader const *connectedMapHeader, s32 offset)
+{
+    int y;
+    int x2, y2;
+    int height;
+    int cWidth, cHeight;
+    if (connectedMapHeader)
+    {
+        cWidth = connectedMapHeader->mapData->width;
+        cHeight = connectedMapHeader->mapData->height;
+        y = offset + 7;
+        x2 = cWidth - 7;
+        if (y < 0)
+        {
+            y2 = -y;
+            if (y + cHeight < gUnknown_03005DC0.height)
+            {
+                height = y + cHeight;
+            }
+            else
+            {
+                height = gUnknown_03005DC0.height;
+            }
+            y = 0;
+        }
+        else
+        {
+            y2 = 0;
+            if (y + cHeight < gUnknown_03005DC0.height)
+            {
+                height = cHeight;
+            }
+            else
+            {
+                height = gUnknown_03005DC0.height - y;
+            }
+        }
+
+        sub_8087F54(
+            /*x*/ 0, y,
+            connectedMapHeader,
+            x2, y2,
+            /*width*/ 7, height);
+    }
+}
+
+void fillEastConnection(struct MapHeader const *mapHeader, struct MapHeader const *connectedMapHeader, s32 offset)
+{
+    int x, y;
+    int y2;
+    int height;
+    int cHeight;
+    if (connectedMapHeader)
+    {
+        cHeight = connectedMapHeader->mapData->height;
+        x = mapHeader->mapData->width + 7;
+        y = offset + 7;
+        if (y < 0)
+        {
+            y2 = -y;
+            if (y + cHeight < gUnknown_03005DC0.height)
+            {
+                height = y + cHeight;
+            }
+            else
+            {
+                height = gUnknown_03005DC0.height;
+            }
+            y = 0;
+        }
+        else
+        {
+            y2 = 0;
+            if (y + cHeight < gUnknown_03005DC0.height)
+            {
+                height = cHeight;
+            }
+            else
+            {
+                height = gUnknown_03005DC0.height - y;
+            }
+        }
+
+        sub_8087F54(
+            x, y,
+            connectedMapHeader,
+            /*x2*/ 0, y2,
+            /*width*/ 8, height);
+    }
+}
+
+union Block
+{
+    struct
+    {
+        u16 block:10;
+        u16 collision:2;
+        u16 elevation:4;
+    } block;
+    u16 value;
+};
+
+u8 MapGridGetZCoordAt(int x, int y)
+{
+    u16 block;
+    int i;
+    u16 *border;
+
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        block = gUnknown_03005DC0.map[x + gUnknown_03005DC0.width * y];
+    }
+    else
+    {
+        border = gMapHeader.mapData->border;
+        i = (x + 1) & 1;
+        i += ((y + 1) & 1) * 2;
+        block = gMapHeader.mapData->border[i];
+        block |= 0xc00;
+    }
+
+    if (block == 0x3ff)
+    {
+        return 0;
+    }
+    
+    return block >> 12;
+}
+
+u8 MapGridIsImpassableAt(int x, int y)
+{
+    u16 block;
+    int i;
+    u16 *border;
+
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        block = gUnknown_03005DC0.map[x + gUnknown_03005DC0.width * y];
+    }
+    else
+    {
+        border = gMapHeader.mapData->border;
+        i = (x + 1) & 1;
+        i += ((y + 1) & 1) * 2;
+        block = gMapHeader.mapData->border[i];
+        block |= 0xc00;
+    }
+    if (block == 0x3ff)
+    {
+        return 1;
+    }
+    return (block & 0xc00) >> 10;
+}
+
+u32 MapGridGetMetatileIdAt(int x, int y)
+{
+    u16 block;
+    int i;
+    int j;
+    struct MapData const *mapData;
+    u16 *border;
+    u16 block2;
+
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        block = gUnknown_03005DC0.map[x + gUnknown_03005DC0.width * y];
+    }
+    else
+    {
+        mapData = gMapHeader.mapData;
+        i = (x + 1) & 1;
+        i += ((y + 1) & 1) * 2;
+        block = mapData->border[i] | 0xc00;
+    }
+    if (block == 0x3ff)
+    {
+        border = gMapHeader.mapData->border;
+        j = (x + 1) & 1;
+        j += ((y + 1) & 1) * 2;
+        block2 = gMapHeader.mapData->border[j];
+        block2 |= 0xc00;
+        return block2 & block;
+    }
+    return block & 0x3ff;
+}
+
+u32 MapGridGetMetatileBehaviorAt(int x, int y)
+{
+    u16 metatile;
+    metatile = MapGridGetMetatileIdAt(x, y);
+    return GetBehaviorByMetatileId(metatile) & 0xff;
+}
+
+u8 MapGridGetMetatileLayerTypeAt(int x, int y)
+{
+    u16 metatile;
+    metatile = MapGridGetMetatileIdAt(x, y);
+    return (GetBehaviorByMetatileId(metatile) & 0xf000) >> 12;
+}
+
+void MapGridSetMetatileIdAt(int x, int y, u16 metatile)
+{
+    int i;
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        i = x + y * gUnknown_03005DC0.width;
+        gUnknown_03005DC0.map[i] = (gUnknown_03005DC0.map[i] & 0xf000) | (metatile & 0xfff);
+    }
+}
+
+void MapGridSetMetatileEntryAt(int x, int y, u16 metatile)
+{
+    int i;
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        i = x + gUnknown_03005DC0.width * y;
+        gUnknown_03005DC0.map[i] = metatile;
+    }
+}
+
+u16 GetBehaviorByMetatileId(u16 metatile)
+{
+    u16 *attributes;
+    if (metatile <= 0x1ff)
+    {
+        attributes = gMapHeader.mapData->primaryTileset->metatileAttributes;
+        return attributes[metatile];
+    }
+    else if (metatile <= 0x3ff)
+    {
+        attributes = gMapHeader.mapData->secondaryTileset->metatileAttributes;
+        return attributes[metatile - 0x200];
+    }
+    else
+    {
+        return 0xff;
+    }
+}
+
+void save_serialize_map(void)
+{
+    int i, j;
+    int x, y;
+    u16 *mapView;
+    int width;
+    mapView = gSaveBlock1Ptr->mapView;
+    width = gUnknown_03005DC0.width;
+    x = gSaveBlock1Ptr->pos.x;
+    y = gSaveBlock1Ptr->pos.y;
+    for (i = y; i < y + 14; i++)
+    {
+        for (j = x; j < x + 15; j++)
+        {
+            *mapView++ = gUnknown_02032318[width * i + j];
+        }
+    }
+}
+
+int sub_8088438(void)
+{
+    u16 i;
+    u32 r2;
+    r2 = 0;
+    for (i = 0; i < 0x200; i++)
+    {
+        r2 |= gSaveBlock1Ptr->mapView[i];
+    }
+    if (r2 == 0)
+    {
+        return 1;
+    }
+    return 0;
+}
+
+void sav2_mapdata_clear(void)
+{
+    CpuFill16(0, gSaveBlock1Ptr->mapView, sizeof(gSaveBlock1Ptr->mapView));
+}
+
+void mapdata_from_sav2(void)
+{
+    u8 a0;
+    int i, j;
+    int x, y;
+    u16 *mapView;
+    int width;
+    mapView = gSaveBlock1Ptr->mapView;
+    if (!sub_8088438())
+    {
+        width = gUnknown_03005DC0.width;
+        x = gSaveBlock1Ptr->pos.x;
+        y = gSaveBlock1Ptr->pos.y;
+        for (i = y; i < y + 14; i++)
+        {
+            if (i == y && i != 0)
+                a0 = 0;
+            else if (i == y + 13 && i != gMapHeader.mapData->height - 1)
+                a0 = 1;
+            else
+                a0 = -1;
+            
+            for (j = x; j < x + 15; j++)
+            {
+                if (!sub_8088BF0(&gUnknown_02032318[j + width * i], width, a0))
+                    gUnknown_02032318[j + width * i] = *mapView;
+                mapView++;
+            }
+        }
+        for (j = x; j < x + 15; j++)
+        {
+            if (y != 0)
+                sub_80D423C(j, y - 1);
+            if (i < gMapHeader.mapData->height - 1)
+                sub_80D42B8(j, y + 13);
+        }
+        sav2_mapdata_clear();
+    }
+}
+
+void sub_80885C4(u8 a1)
+{
+    int width;
+    u16 *mapView;
+    int x0, y0;
+    int x2, y2;
+    u16 *src, *dest;
+    int srci, desti;
+    int r9, r8;
+    int x, y;
+    int i, j;
+    mapView = gSaveBlock1Ptr->mapView;
+    width = gUnknown_03005DC0.width;
+    r9 = 0;
+    r8 = 0;
+    x0 = gSaveBlock1Ptr->pos.x;
+    y0 = gSaveBlock1Ptr->pos.y;
+    x2 = 15;
+    y2 = 14;
+    switch (a1)
+    {
+    case CONNECTION_NORTH:
+        y0 += 1;
+        y2 = 13;
+        break;
+    case CONNECTION_SOUTH:
+        r8 = 1;
+        y2 = 13;
+        break;
+    case CONNECTION_WEST:
+        x0 += 1;
+        x2 = 14;
+        break;
+    case CONNECTION_EAST:
+        r9 = 1;
+        x2 = 14;
+        break;
+    }
+    for (y = 0; y < y2; y++)
+    {
+        i = 0;
+        j = 0;
+        for (x = 0; x < x2; x++)
+        {
+            desti = width * (y + y0);
+            srci = (y + r8) * 15 + r9;
+            src = &mapView[srci + i];
+            dest = &gUnknown_02032318[x0 + desti + j];
+            *dest = *src;
+            i++;
+            j++;
+        }
+    }
+    sav2_mapdata_clear();
+}
+
+int GetMapBorderIdAt(int x, int y)
+{
+    struct MapData const *mapData;
+    u16 block, block2;
+    int i, j;
+    if (x >= 0 && x < gUnknown_03005DC0.width
+     && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        i = gUnknown_03005DC0.width;
+        i *= y;
+        block = gUnknown_03005DC0.map[x + i];
+        if (block == 0x3ff)
+        {
+            goto fail;
+        }
+    }
+    else
+    {
+        mapData = gMapHeader.mapData;
+        j = (x + 1) & 1;
+        j += ((y + 1) & 1) * 2;
+        block2 = 0xc00 | mapData->border[j];
+        if (block2 == 0x3ff)
+        {
+            goto fail;
+        }
+    }
+    goto success;
+fail:
+    return -1;
+success:
+
+    if (x >= (gUnknown_03005DC0.width - 8))
+    {
+        if (!gUnknown_02037340.east)
+        {
+            return -1;
+        }
+        return CONNECTION_EAST;
+    }
+    else if (x < 7)
+    {
+        if (!gUnknown_02037340.west)
+        {
+            return -1;
+        }
+        return CONNECTION_WEST;
+    }
+    else if (y >= (gUnknown_03005DC0.height - 7))
+    {
+        if (!gUnknown_02037340.south)
+        {
+            return -1;
+        }
+        return CONNECTION_SOUTH;
+    }
+    else if (y < 7)
+    {
+        if (!gUnknown_02037340.north)
+        {
+            return -1;
+        }
+        return CONNECTION_NORTH;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int GetPostCameraMoveMapBorderId(int x, int y)
+{
+    return GetMapBorderIdAt(gSaveBlock1Ptr->pos.x + 7 + x, gSaveBlock1Ptr->pos.y + 7 + y);
+}
+
+int CanCameraMoveInDirection(int direction)
+{
+    int x, y;
+    x = gSaveBlock1Ptr->pos.x + 7 + gUnknown_08339D64[direction].x;
+    y = gSaveBlock1Ptr->pos.y + 7 + gUnknown_08339D64[direction].y;
+    if (GetMapBorderIdAt(x, y) == -1)
+    {
+        return 0;
+    }
+    return 1;
+}
+
+void sub_80887F8(struct MapConnection *connection, int direction, int x, int y)
+{
+    struct MapHeader const *mapHeader;
+    mapHeader = mapconnection_get_mapheader(connection);
+    switch (direction)
+    {
+    case CONNECTION_EAST:
+        gSaveBlock1Ptr->pos.x = -x;
+        gSaveBlock1Ptr->pos.y -= connection->offset;
+        break;
+    case CONNECTION_WEST:
+        gSaveBlock1Ptr->pos.x = mapHeader->mapData->width;
+        gSaveBlock1Ptr->pos.y -= connection->offset;
+        break;
+    case CONNECTION_SOUTH:
+        gSaveBlock1Ptr->pos.x -= connection->offset;
+        gSaveBlock1Ptr->pos.y = -y;
+        break;
+    case CONNECTION_NORTH:
+        gSaveBlock1Ptr->pos.x -= connection->offset;
+        gSaveBlock1Ptr->pos.y = mapHeader->mapData->height;
+        break;
+    }
+}
+
+bool8 CameraMove(int x, int y)
+{
+    unsigned int direction;
+    struct MapConnection *connection;
+    int old_x, old_y;
+    gCamera.active = FALSE;
+    direction = GetPostCameraMoveMapBorderId(x, y);
+    if (direction + 1 <= 1)
+    {
+        gSaveBlock1Ptr->pos.x += x;
+        gSaveBlock1Ptr->pos.y += y;
+    }
+    else
+    {
+        save_serialize_map();
+        sub_81BE72C();
+        old_x = gSaveBlock1Ptr->pos.x;
+        old_y = gSaveBlock1Ptr->pos.y;
+        connection = sub_8088950(direction, gSaveBlock1Ptr->pos.x, gSaveBlock1Ptr->pos.y);
+        sub_80887F8(connection, direction, x, y);
+        mliX_load_map(connection->mapGroup, connection->mapNum);
+        gCamera.active = TRUE;
+        gCamera.x = old_x - gSaveBlock1Ptr->pos.x;
+        gCamera.y = old_y - gSaveBlock1Ptr->pos.y;
+        gSaveBlock1Ptr->pos.x += x;
+        gSaveBlock1Ptr->pos.y += y;
+        sub_80885C4(direction);
+    }
+    return gCamera.active;
+}
+
+struct MapConnection *sub_8088950(u8 direction, int x, int y)
+{
+    int count;
+    struct MapConnection *connection;
+    int i;
+    count = gMapHeader.connections->count;
+    connection = gMapHeader.connections->connections;
+    for (i = 0; i < count; i++, connection++)
+    {
+        if (connection->direction == direction && sub_80889A8(direction, x, y, connection) == TRUE)
+            return connection;
+    }
+    return NULL;
+}
+
+bool8 sub_80889A8(u8 direction, int x, int y, struct MapConnection *connection)
+{
+    struct MapHeader const *mapHeader;
+    mapHeader = mapconnection_get_mapheader(connection);
+    switch (direction)
+    {
+    case CONNECTION_SOUTH:
+    case CONNECTION_NORTH:
+        return sub_8088A0C(x, gMapHeader.mapData->width, mapHeader->mapData->width, connection->offset);
+    case CONNECTION_WEST:
+    case CONNECTION_EAST:
+        return sub_8088A0C(y, gMapHeader.mapData->height, mapHeader->mapData->height, connection->offset);
+    }
+    return FALSE;
+}
+
+bool8 sub_8088A0C(int x, int src_width, int dest_width, int offset)
+{
+    int offset2;
+    offset2 = offset;
+
+    if (offset2 < 0)
+        offset2 = 0;
+
+    if (dest_width + offset < src_width)
+        src_width = dest_width + offset;
+
+    if (offset2 <= x && x <= src_width)
+        return TRUE;
+
+    return FALSE;
+}
+
+int sub_8088A38(int x, int width)
+{
+    if (x >= 0 && x < width)
+        return TRUE;
+
+    return FALSE;
+}
+
+int sub_8088A4C(struct MapConnection *connection, int x, int y)
+{
+    struct MapHeader const *mapHeader;
+    mapHeader = mapconnection_get_mapheader(connection);
+    switch (connection->direction)
+    {
+    case CONNECTION_SOUTH:
+    case CONNECTION_NORTH:
+        return sub_8088A38(x - connection->offset, mapHeader->mapData->width);
+    case CONNECTION_WEST:
+    case CONNECTION_EAST:
+        return sub_8088A38(y - connection->offset, mapHeader->mapData->height);
+    }
+    return FALSE;
+}
+
+struct MapConnection *sub_8088A8C(s16 x, s16 y)
+{
+    int count;
+    struct MapConnection *connection;
+    int i;
+    u8 direction;
+    if (!gMapHeader.connections)
+    {
+        return NULL;
+    }
+    else
+    {
+        count = gMapHeader.connections->count;
+        connection = gMapHeader.connections->connections;
+        for (i = 0; i < count; i++, connection++)
+        {
+            direction = connection->direction;
+            if ((direction == CONNECTION_DIVE || direction == CONNECTION_EMERGE)
+             || (direction == CONNECTION_NORTH && y > 6)
+             || (direction == CONNECTION_SOUTH && y < gMapHeader.mapData->height + 7)
+             || (direction == CONNECTION_WEST && x > 6)
+             || (direction == CONNECTION_EAST && x < gMapHeader.mapData->width + 7))
+            {
+                continue;
+            }
+            if (sub_8088A4C(connection, x - 7, y - 7) == TRUE)
+            {
+                return connection;
+            }
+        }
+    }
+    return NULL;
+}
+
+void sub_8088B3C(u16 x, u16 y)
+{
+    gSaveBlock1Ptr->pos.x = x - 7;
+    gSaveBlock1Ptr->pos.y = y - 7;
+}
+
+void sav1_camera_get_focus_coords(u16 *x, u16 *y)
+{
+    *x = gSaveBlock1Ptr->pos.x + 7;
+    *y = gSaveBlock1Ptr->pos.y + 7;
+}
+
+void SetCameraCoords(u16 x, u16 y)
+{
+    gSaveBlock1Ptr->pos.x = x;
+    gSaveBlock1Ptr->pos.y = y;
+}
+
+void GetCameraCoords(u16 *x, u16 *y)
+{
+    *x = gSaveBlock1Ptr->pos.x;
+    *y = gSaveBlock1Ptr->pos.y;
+}
+
+void sub_8088B94(int x, int y, int a2)
+{
+    if (x >= 0 && x < gUnknown_03005DC0.width && y >= 0 && y < gUnknown_03005DC0.height)
+    {
+        if (a2 != 0)
+            gUnknown_03005DC0.map[x + gUnknown_03005DC0.width * y] |= 0xC00;
+        else
+            gUnknown_03005DC0.map[x + gUnknown_03005DC0.width * y] &= 0xF3FF;
+    }
+}
+
+bool8 sub_8088BF0(u16* a0, u16 a1, u8 a2)
+{
+    if (a2 == 0xFF)
+        return FALSE;
+    
+    if (a2 == 0)
+        a0 -= a1;
+    else
+        a0 += a1;
+
+    if (sub_80FADE4(*a0 & 0x3FF, a2) == 1)
+        return TRUE;
+    return FALSE;
+}
+
+void copy_tileset_patterns_to_vram(struct Tileset const *tileset, u16 numTiles, u16 offset)
+{
+    if (tileset)
+    {
+        if (!tileset->isCompressed)
+            LoadBgTiles(2, tileset->tiles, numTiles * 32, offset);
+        else
+            decompress_and_copy_tile_data_to_vram(2, tileset->tiles, numTiles * 32, offset, 0);
+    }
+}
+
+void copy_tileset_patterns_to_vram2(struct Tileset const *tileset, u16 numTiles, u16 offset)
+{
+    if (tileset)
+    {
+        if (!tileset->isCompressed)
+            LoadBgTiles(2, tileset->tiles, numTiles * 32, offset);
+        else
+            copy_decompressed_tile_data_to_vram_autofree(2, tileset->tiles, numTiles * 32, offset, 0);
+    }
+}
+
+void nullsub_3(u16 a0, u16 a1)
+{
+
+}
+
+void nullsub_90(void)
+{
+
+}
+
+void apply_map_tileset_palette(struct Tileset const *tileset, u16 destOffset, u16 size)
+{
+    u16 black = RGB_BLACK;
+
+    if (tileset)
+    {
+        if (tileset->isSecondary == FALSE)
+        {
+            LoadPalette(&black, destOffset, 2);
+            LoadPalette(((u16*)tileset->palettes) + 1, destOffset + 1, size - 2);
+            nullsub_3(destOffset + 1, (size - 2) >> 1);
+        }
+        else if (tileset->isSecondary == TRUE)
+        {
+            LoadPalette(((u16*)tileset->palettes) + 0x60, destOffset, size);
+            nullsub_3(destOffset, size >> 1);
+        }
+        else
+        {
+            LoadCompressedPalette((u16*)tileset->palettes, destOffset, size);
+            nullsub_3(destOffset, size >> 1);
+        }
+    }
+}
+
+void copy_map_tileset1_to_vram(struct MapData const *mapData)
+{
+    copy_tileset_patterns_to_vram(mapData->primaryTileset, 0x200, 0);
+}
+
+void copy_map_tileset2_to_vram(struct MapData const *mapData)
+{
+    copy_tileset_patterns_to_vram(mapData->secondaryTileset, 0x200, 0x200);
+}
+
+void copy_map_tileset2_to_vram_2(struct MapData const *mapData)
+{
+    copy_tileset_patterns_to_vram2(mapData->secondaryTileset, 0x200, 0x200);
+}
+
+void apply_map_tileset1_palette(struct MapData const *mapData)
+{
+    apply_map_tileset_palette(mapData->primaryTileset, 0, 0xC0);
+}
+
+void apply_map_tileset2_palette(struct MapData const *mapData)
+{
+    apply_map_tileset_palette(mapData->secondaryTileset, 0x60, 0xE0);
+}
+
+void copy_map_tileset1_tileset2_to_vram(struct MapData const *mapData)
+{
+    if (mapData)
+    {
+        copy_tileset_patterns_to_vram2(mapData->primaryTileset, 0x200, 0);
+        copy_tileset_patterns_to_vram2(mapData->secondaryTileset, 0x200, 0x200);
+    }
+}
+
+void apply_map_tileset1_tileset2_palette(struct MapData const *mapData)
+{
+    if (mapData)
+    {
+        apply_map_tileset1_palette(mapData);
+        apply_map_tileset2_palette(mapData);
+    }
+}
diff --git a/src/overworld.c b/src/overworld.c
index 532615f27..f42f0db7f 100644
--- a/src/overworld.c
+++ b/src/overworld.c
@@ -137,7 +137,6 @@ extern void trainer_hill_map_load_related(void);
 extern void sub_8087D74(void);
 extern void battle_pyramid_map_load_related(u8);
 extern void sub_80B00E8(u8);
-extern void UpdateTVScreensOnMap(u32, u32);
 extern void sub_80E9238(u8);
 extern void sub_81A3908(void);
 extern void sub_81AA2F8(void);
@@ -614,12 +613,12 @@ bool32 warp_data_is_not_neg_1(struct WarpData *warp)
         return TRUE;
 }
 
-const struct MapHeader *Overworld_GetMapHeaderByGroupAndId(u16 mapGroup, u16 mapNum)
+struct MapHeader const *const Overworld_GetMapHeaderByGroupAndId(u16 mapGroup, u16 mapNum)
 {
     return gMapGroups[mapGroup][mapNum];
 }
 
-const struct MapHeader *warp1_get_mapheader(void)
+struct MapHeader const *const warp1_get_mapheader(void)
 {
     return Overworld_GetMapHeaderByGroupAndId(sWarpDestination.mapGroup, sWarpDestination.mapNum);
 }
diff --git a/src/secret_base.c b/src/secret_base.c
index c886912f4..cd6143ed0 100644
--- a/src/secret_base.c
+++ b/src/secret_base.c
@@ -327,7 +327,7 @@ void sub_80E8E18(void)
     VarSet(VAR_SECRET_BASE_MAP, gMapHeader.regionMapSectionId);
 }
 
-void sub_80E8EE0(struct MapEvents *events)
+void sub_80E8EE0(struct MapEvents const *events)
 {
     u16 bgEventIndex;
     u16 i;
diff --git a/sym_common.txt b/sym_common.txt
index b0548a84c..ff7dcc7b6 100644
--- a/sym_common.txt
+++ b/sym_common.txt
@@ -55,17 +55,8 @@ gUnknown_03005DB4: @ 3005DB4
 gFieldLinkPlayerCount: @ 3005DB8
 	.space 0x8
 
-gUnknown_03005DC0: @ 3005DC0
-	.space 0x10
-
-gUnknown_03005DD0: @ 3005DD0
-	.space 0x18
-
-gUnknown_03005DE8: @ 3005DE8
-	.space 0x4
-
-gUnknown_03005DEC: @ 3005DEC
-	.space 0x4
+    .include "fieldmap.o"
+    .include "field_camera.o"
 
 gSelectedMapObject: @ 3005DF0
 	.space 0x4
diff --git a/sym_ewram.txt b/sym_ewram.txt
index 9bf04d201..f860e63c7 100644
--- a/sym_ewram.txt
+++ b/sym_ewram.txt
@@ -209,22 +209,10 @@ gUnknown_020322D5: @ 20322D5
 	.space 0x3
 
 	.include "src/overworld.o"
+	.include "src/fieldmap.o"
+	.include "src/field_camera.o"
 
-gUnknown_02032318: @ 2032318
-	.space 0x5000
-
-gMapHeader: @ 2037318
-	.space 0x1C
-
-gCamera: @ 2037334
-	.space 0xC
-
-gUnknown_02037340: @ 2037340
-	.space 0x8
-
-gUnusedBikeCameraAheadPanback: @ 2037348
-	.space 0x4
-
+	.align 2
 gUnknown_0203734C: @ 203734C
 	.space 0x4