diff --git a/Makefile b/Makefile
index 78a2c2a4f..d97634399 100644
--- a/Makefile
+++ b/Makefile
@@ -303,6 +303,7 @@ $1: $2 $$(shell $(SCANINC) -I include -I "" $2)
 	$$(PREPROC) $$< charmap.txt | $$(CPP) -I include | $$(AS) $$(ASFLAGS) -o $$@
 endef
 $(foreach src, $(REGULAR_DATA_ASM_SRCS), $(eval $(call DATA_ASM_DEP,$(patsubst $(DATA_ASM_SUBDIR)/%.s,$(DATA_ASM_BUILDDIR)/%.o, $(src)),$(src))))
+$(foreach src, $(C_ASM_SRCS), $(eval $(call DATA_ASM_DEP,$(patsubst $(C_SUBDIR)/%.s,$(C_BUILDDIR)/%.o, $(src)),$(src))))
 endif
 
 $(SONG_BUILDDIR)/%.o: $(SONG_SUBDIR)/%.s
diff --git a/src/crt0.s b/src/crt0.s
index 49f214f80..cc83a04df 100644
--- a/src/crt0.s
+++ b/src/crt0.s
@@ -1,3 +1,4 @@
+#include "constants/global.h"
 	.include "constants/gba_constants.inc"
 
 	.syntax unified
@@ -34,8 +35,8 @@ GPIOPortReadEnable: @ 80000C8
 @ 80000CC
 	.space 0x34
 
-	.4byte 3
-	.4byte 2
+	.4byte GAME_VERSION
+	.4byte GAME_LANGUAGE
 
 	.ascii "pokemon emerald version"
 	.space 9
@@ -51,17 +52,33 @@ GPIOPortReadEnable: @ 80000C8
 	.4byte gMoveNames
 	.4byte gDecorations
 
-	.4byte 0x00001270, 0x0000139c, 0x00000018, 0x00000988
-	.4byte 0x00003b24, 0x00000046, 0x000008e4, 0x000008ac
-	.4byte 0x00000182
+	.4byte 0x00001270 @ offsetof(struct SaveBlock1, flags) 
+	.4byte 0x0000139c @ offsetof(struct SaveBlock1, vars)
+	.4byte 0x00000018 @ offsetof(struct SaveBlock2, pokedex)
+	.4byte 0x00000988 @ offsetof(struct SaveBlock1, seen1)
+	.4byte 0x00003b24 @ offsetof(struct SaveBlock1, seen2)
+	.4byte 0x00000046 @ ?
+	.4byte 0x000008e4 @ ?
+	.4byte 0x000008ac @ ?
+	.4byte 0x00000182 @ NATIONAL_DEX_COUNT?
 
 	.byte 0x07, 0x0a, 0x0a, 0x0a, 0x0c, 0x0c, 0x06, 0x0c
 	.byte 0x06, 0x10, 0x12, 0x0c, 0x0f, 0x0b, 0x01, 0x08
 
-	.4byte 0x0000000c, 0x00000f2c, 0x00003d88, 0x00000234
-	.4byte 0x00000238, 0x00000009, 0x0000000a, 0x00000000
-	.4byte 0x00000008, 0x00000ca8, 0x00000ca8, 0x000031c7
-	.4byte 0x000031b3, 0x00000000
+	.4byte 0x0000000c @ ?
+	.4byte 0x00000f2c @ sizeof(struct SaveBlock2)
+	.4byte 0x00003d88 @ sizeof(struct SaveBlock1)
+	.4byte 0x00000234 @ offsetof(struct SaveBlock1, playerPartyCount)
+	.4byte 0x00000238 @ offsetof(struct SaveBlock1, playerParty)
+	.4byte 0x00000009 @ offsetof(struct SaveBlock2, specialSaveWarpFlags)
+	.4byte 0x0000000a @ offsetof(struct SaveBlock2, playerTrainerId)
+	.4byte 0x00000000 @ offsetof(struct SaveBlock2, playerName)
+	.4byte 0x00000008 @ offsetof(struct SaveBlock2, playerGender)
+	.4byte 0x00000ca8 @ offsetof(struct SaveBlock2, frontier.challengeStatus)
+	.4byte 0x00000ca8 @ offsetof(struct SaveBlock2, frontier.challengeStatus)
+	.4byte 0x000031c7 @ offsetof(struct SaveBlock1, ? part-way into giftRibbons)
+	.4byte 0x000031b3 @ offsetof(struct SaveBlock1, ? part-way into giftRibbons)
+	.4byte 0x00000000
 
 	.4byte gBaseStats
 	.4byte gAbilityNames
@@ -71,12 +88,19 @@ GPIOPortReadEnable: @ 80000C8
 	.4byte gBallSpriteSheets
 	.4byte gBallSpritePalettes
 
-	.4byte 0x000000a8, 0x00000864, 0x0000089b
+	.4byte 0x000000a8 @ offsetof(struct SaveBlock2, gcnLinkFlags)
+	.4byte 0x00000864 @ ?
+	.4byte 0x0000089b @ ?
 
 	.byte 0x1e, 0x1e, 0x10, 0x40
 
-	.4byte 0x0000322e, 0x00000498, 0x000031a8, 0x000031f8
-	.4byte 0x00000034, 0x00000000, 0x00000000
+	.4byte 0x0000322e @ offsetof(struct SaveBlock1, ? part-way into unk_322C)
+	.4byte 0x00000498 @ offsetof(struct SaveBlock1, pcItems)
+	.4byte 0x000031a8 @ offsetof(struct SaveBlock1, giftRibbons)
+	.4byte 0x000031f8 @ offsetof(struct SaveBlock1, enigmaBerry)
+	.4byte 0x00000034 @ offsetof(struct SaveBlock1, mapView)
+	.4byte 0x00000000
+	.4byte 0x00000000
 
 	.arm
 	.align 2, 0