diff --git a/Makefile b/Makefile
index 451a28740..6869e5df1 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ endif
 
 LDFLAGS = -Map ../../$(MAP)
 
-LIB := $(LIBPATH) -lgcc -lc
+LIB := $(LIBPATH) -lgcc -lc -L../../libagbsyscall -lagbsyscall
 
 SHA1 := $(shell { command -v sha1sum || command -v shasum; } 2>/dev/null) -c
 GFX := tools/gbagfx/gbagfx$(EXE)
@@ -111,7 +111,7 @@ MAKEFLAGS += --no-print-directory
 # Secondary expansion is required for dependency variables in object rules.
 .SECONDEXPANSION:
 
-.PHONY: all rom clean compare tidy tools mostlyclean clean-tools $(TOOLDIRS) berry_fix
+.PHONY: all rom clean compare tidy tools mostlyclean clean-tools $(TOOLDIRS) berry_fix libagbsyscall
 
 infoshell = $(foreach line, $(shell $1 | sed "s/ /__SPACE__/g"), $(info $(subst __SPACE__, ,$(line))))
 
@@ -161,7 +161,7 @@ tools: $(TOOLDIRS)
 $(TOOLDIRS):
 	@$(MAKE) -C $@ CC=$(HOSTCC) CXX=$(HOSTCXX)
 
-rom: berry_fix $(ROM)
+rom: $(ROM)
 ifeq ($(COMPARE),1)
 	@$(SHA1) rom.sha1
 endif
@@ -182,7 +182,9 @@ mostlyclean: tidy
 	rm -f $(DATA_ASM_SUBDIR)/maps/connections.inc $(DATA_ASM_SUBDIR)/maps/events.inc $(DATA_ASM_SUBDIR)/maps/groups.inc $(DATA_ASM_SUBDIR)/maps/headers.inc
 	find $(DATA_ASM_SUBDIR)/maps \( -iname 'connections.inc' -o -iname 'events.inc' -o -iname 'header.inc' \) -exec rm {} +
 	rm -f $(AUTO_GEN_TARGETS)
+	rm -f $(OBJ_DIR)/libagbsyscall.a
 	@$(MAKE) clean -C berry_fix
+	@$(MAKE) clean -C libagbsyscall
 
 tidy:
 	rm -f $(ROM) $(ELF) $(MAP)
@@ -310,7 +312,7 @@ endif
 $(OBJ_DIR)/ld_script.ld: $(LD_SCRIPT) $(LD_SCRIPT_DEPS)
 	cd $(OBJ_DIR) && sed "s#tools/#../../tools/#g" ../../$(LD_SCRIPT) > ld_script.ld
 
-$(ELF): $(OBJ_DIR)/ld_script.ld $(OBJS)
+$(ELF): $(OBJ_DIR)/ld_script.ld $(OBJS) libagbsyscall
 	cd $(OBJ_DIR) && $(LD) $(LDFLAGS) -T ld_script.ld -o ../../$@ $(OBJS_REL) $(LIB)
 	$(FIX) $@ -t"$(TITLE)" -c$(GAME_CODE) -m$(MAKER_CODE) -r$(REVISION) --silent
 
@@ -323,4 +325,7 @@ modern: ; @$(MAKE) MODERN=1
 berry_fix/berry_fix.gba: berry_fix
 
 berry_fix:
-	@$(MAKE) -C berry_fix COMPARE=$(COMPARE)
+	@$(MAKE) -C berry_fix COMPARE=$(COMPARE) TOOLCHAIN=$(TOOLCHAIN)
+
+libagbsyscall:
+	@$(MAKE) -C libagbsyscall TOOLCHAIN=$(TOOLCHAIN)
diff --git a/berry_fix/Makefile b/berry_fix/Makefile
index 2bc225eba..0ead3804f 100644
--- a/berry_fix/Makefile
+++ b/berry_fix/Makefile
@@ -1,7 +1,29 @@
-include $(DEVKITARM)/base_tools
+TOOLCHAIN := $(DEVKITARM)
+COMPARE ?= 0
+
+ifeq ($(CC),)
+HOSTCC := gcc
+else
+HOSTCC := $(CC)
+endif
+
+ifeq ($(CXX),)
+HOSTCXX := g++
+else
+HOSTCXX := $(CXX)
+endif
+
+ifneq (,$(wildcard $(TOOLCHAIN)/base_tools))
+include $(TOOLCHAIN)/base_tools
+else
+export PATH := $(TOOLCHAIN)/bin:$(PATH)
+PREFIX := arm-none-eabi-
+OBJCOPY := $(PREFIX)objcopy
+export CC := $(PREFIX)gcc
+export AS := $(PREFIX)as
+endif
 export CPP := $(PREFIX)cpp
 export LD := $(PREFIX)ld
-COMPARE ?= 0
 
 ifeq ($(OS),Windows_NT)
 EXE := .exe
@@ -144,7 +166,7 @@ $(DATA_ASM_BUILDDIR)/%.o: data_dep = $(shell $(SCANINC) $(DATA_ASM_SUBDIR)/$*.s)
 endif
 
 payload:
-	@$(MAKE) -C payload COMPARE=$(COMPARE)
+	@$(MAKE) -C payload COMPARE=$(COMPARE) TOOLCHAIN=$(TOOLCHAIN)
 
 payload/payload.gba: payload
 
diff --git a/berry_fix/payload/Makefile b/berry_fix/payload/Makefile
index 63e326724..a121fda93 100644
--- a/berry_fix/payload/Makefile
+++ b/berry_fix/payload/Makefile
@@ -1,7 +1,29 @@
-include $(DEVKITARM)/base_tools
+TOOLCHAIN := $(DEVKITARM)
+COMPARE ?= 0
+
+ifeq ($(CC),)
+HOSTCC := gcc
+else
+HOSTCC := $(CC)
+endif
+
+ifeq ($(CXX),)
+HOSTCXX := g++
+else
+HOSTCXX := $(CXX)
+endif
+
+ifneq (,$(wildcard $(TOOLCHAIN)/base_tools))
+include $(TOOLCHAIN)/base_tools
+else
+export PATH := $(TOOLCHAIN)/bin:$(PATH)
+PREFIX := arm-none-eabi-
+OBJCOPY := $(PREFIX)objcopy
+export CC := $(PREFIX)gcc
+export AS := $(PREFIX)as
+endif
 export CPP := $(PREFIX)cpp
 export LD := $(PREFIX)ld
-COMPARE ?= 0
 
 ifeq ($(OS),Windows_NT)
 EXE := .exe
diff --git a/ld_script.txt b/ld_script.txt
index cb3a7fa16..9caa100cc 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -361,6 +361,21 @@ SECTIONS {
         src/librfu_rfu.o(.text);
         asm/librfu.o(.text);
         src/libisagbprn.o(.text);
+        *libagbsyscall.a:ArcTan2.o(.text);
+        *libagbsyscall.a:BgAffineSet.o(.text);
+        *libagbsyscall.a:CpuFastSet.o(.text);
+        *libagbsyscall.a:CpuSet.o(.text);
+        *libagbsyscall.a:Div.o(.text);
+        *libagbsyscall.a:LZ77UnCompVram.o(.text);
+        *libagbsyscall.a:LZ77UnCompWram.o(.text);
+        *libagbsyscall.a:MultiBoot.o(.text);
+        *libagbsyscall.a:ObjAffineSet.o(.text);
+        *libagbsyscall.a:RLUnCompVram.o(.text);
+        *libagbsyscall.a:RLUnCompWram.o(.text);
+        *libagbsyscall.a:RegisterRamReset.o(.text);
+        *libagbsyscall.a:SoftReset.o(.text);
+        *libagbsyscall.a:Sqrt.o(.text);
+        *libagbsyscall.a:VBlankIntrWait.o(.text);
         src/libagbsyscall.o(.text);
         *libgcc.a:_call_via_rX.o(.text);
         *libgcc.a:_divdi3.o(.text);
diff --git a/libagbsyscall/Makefile b/libagbsyscall/Makefile
new file mode 100644
index 000000000..911cdb237
--- /dev/null
+++ b/libagbsyscall/Makefile
@@ -0,0 +1,98 @@
+TOOLCHAIN := $(DEVKITARM)
+COMPARE ?= 0
+
+ifeq ($(CC),)
+HOSTCC := gcc
+else
+HOSTCC := $(CC)
+endif
+
+ifeq ($(CXX),)
+HOSTCXX := g++
+else
+HOSTCXX := $(CXX)
+endif
+
+ifneq (,$(wildcard $(TOOLCHAIN)/base_tools))
+include $(TOOLCHAIN)/base_tools
+else
+export PATH := $(TOOLCHAIN)/bin:$(PATH)
+PREFIX := arm-none-eabi-
+OBJCOPY := $(PREFIX)objcopy
+export CC := $(PREFIX)gcc
+export AS := $(PREFIX)as
+endif
+export CPP := $(PREFIX)cpp
+export LD := $(PREFIX)ld
+
+ifeq ($(OS),Windows_NT)
+EXE := .exe
+else
+EXE :=
+endif
+
+ASFLAGS := -mcpu=arm7tdmi
+ARFLAGS := rc
+
+SYSCALLS := IntrWait \
+            RegisterRamReset \
+            Sqrt \
+            MusicPlayerOpen \
+            SoundBiasReset \
+            SoundDriverVSyncOn \
+            Mod \
+            VBlankIntrWait \
+            MusicPlayerStart \
+            SoundDriverVSyncOff \
+            HuffUnComp \
+            SoftResetExram \
+            MusicPlayerFadeOut \
+            LZ77UnCompWram \
+            SoundDriverMain \
+            SoundBiasChange \
+            LZ77UnCompVram \
+            ArcTan2 \
+            MusicPlayerStop \
+            DivArm \
+            ModArm \
+            SoundDriverVSync \
+            SoundDriverInit \
+            BgAffineSet \
+            Diff8bitUnFilterWram \
+            MultiBoot \
+            MidiKey2Freq \
+            Div \
+            Diff8bitUnFilterVram \
+            ArcTan \
+            ObjAffineSet \
+            SoftResetRom \
+            SoundDriverMode \
+            RLUnCompWram \
+            BitUnPack \
+            SoundChannelClear \
+            CpuFastSet \
+            CpuSet \
+            Diff16bitUnFilter \
+            SoundBiasSet \
+            MusicPlayerContinue \
+            SoftReset \
+            RLUnCompVram
+
+ASM_SRCS := libagbsyscall.s
+ASM_OBJS := $(foreach syscall, $(SYSCALLS), $(syscall).o)
+
+LIB := libagbsyscall.a
+
+.PHONY: all clean
+
+all: $(LIB)
+	@:
+
+clean:
+	rm -f $(LIB) $(ASM_OBJS)
+
+$(LIB): $(ASM_OBJS)
+	$(AR) $(ARFLAGS) $@ $^
+
+$(ASM_OBJS): libagbsyscall.s
+	$(AS) $(ASFLAGS) --defsym L_$(*F)=1 -o $@ $<
diff --git a/libagbsyscall/libagbsyscall.s b/libagbsyscall/libagbsyscall.s
new file mode 100644
index 000000000..893235e32
--- /dev/null
+++ b/libagbsyscall/libagbsyscall.s
@@ -0,0 +1,432 @@
+	.include "../constants/gba_constants.inc"
+	.include "../asm/macros/function.inc"
+
+	.text
+
+	.set SOFT_RESET_DIRECT_BUF, 0x03007FFA
+	.set RESET_EX_WRAM_FLAG,           0x1
+
+	.ifdef NO_GRANULAR_AGBSYSCALL
+	.set L_IntrWait, 1
+	.set L_RegisterRamReset, 1
+	.set L_Sqrt, 1
+	.set L_MusicPlayerOpen, 1
+	.set L_SoundBiasReset, 1
+	.set L_SoundDriverVSyncOn, 1
+	.set L_Mod, 1
+	.set L_VBlankIntrWait, 1
+	.set L_MusicPlayerStart, 1
+	.set L_SoundDriverVSyncOff, 1
+	.set L_HuffUnComp, 1
+	.set L_SoftResetExram, 1
+	.set L_MusicPlayerFadeOut, 1
+	.set L_LZ77UnCompWram, 1
+	.set L_SoundDriverMain, 1
+	.set L_SoundBiasChange, 1
+	.set L_LZ77UnCompVram, 1
+	.set L_ArcTan2, 1
+	.set L_MusicPlayerStop, 1
+	.set L_DivArm, 1
+	.set L_ModArm, 1
+	.set L_SoundDriverVSync, 1
+	.set L_SoundDriverInit, 1
+	.set L_BgAffineSet, 1
+	.set L_Diff8bitUnFilterWram, 1
+	.set L_MultiBoot, 1
+	.set L_MidiKey2Freq, 1
+	.set L_Div, 1
+	.set L_Diff8bitUnFilterVram, 1
+	.set L_ArcTan, 1
+	.set L_ObjAffineSet, 1
+	.set L_SoftResetRom, 1
+	.set L_SoundDriverMode, 1
+	.set L_RLUnCompWram, 1
+	.set L_BitUnPack, 1
+	.set L_SoundChannelClear, 1
+	.set L_CpuFastSet, 1
+	.set L_CpuSet, 1
+	.set L_Diff16bitUnFilter, 1
+	.set L_SoundBiasSet, 1
+	.set L_MusicPlayerContinue, 1
+	.set L_SoftReset, 1
+	.set L_RLUnCompVram, 1
+	.endif
+
+	.ifdef L_IntrWait
+	thumb_func_start IntrWait
+IntrWait:
+	mov r2, #0
+	swi 4
+	bx lr
+	thumb_func_end IntrWait
+	.endif
+
+	.ifdef L_RegisterRamReset
+	thumb_func_start RegisterRamReset
+RegisterRamReset:
+	swi 1
+	bx lr
+	thumb_func_end RegisterRamReset
+	.endif
+
+	.ifdef L_Sqrt
+	thumb_func_start Sqrt
+Sqrt:
+	swi 8
+	bx lr
+	thumb_func_end Sqrt
+	.endif
+
+	.ifdef L_MusicPlayerOpen
+	thumb_func_start MusicPlayerOpen
+MusicPlayerOpen:
+	swi 32
+	bx lr
+	thumb_func_end MusicPlayerOpen
+	.endif
+
+	.ifdef L_SoundBiasReset
+	thumb_func_start SoundBiasReset
+SoundBiasReset:
+	mov r0, #0
+	swi 25
+	bx lr
+	thumb_func_end SoundBiasReset
+	.endif
+
+	.ifdef L_SoundDriverVSyncOn
+	thumb_func_start SoundDriverVSyncOn
+SoundDriverVSyncOn:
+	swi 41
+	bx lr
+	thumb_func_end SoundDriverVSyncOn
+	.endif
+
+	.ifdef L_Mod
+	thumb_func_start Mod
+Mod:
+	swi 6
+	mov r0, r1
+	bx lr
+	thumb_func_end Mod
+	.endif
+
+	.ifdef L_VBlankIntrWait
+	thumb_func_start VBlankIntrWait
+VBlankIntrWait:
+	mov r2, #0
+	swi 5
+	bx lr
+	thumb_func_end VBlankIntrWait
+	.endif
+
+	.ifdef L_MusicPlayerStart
+	thumb_func_start MusicPlayerStart
+MusicPlayerStart:
+	swi 33
+	bx lr
+	thumb_func_end MusicPlayerStart
+	.endif
+
+	.ifdef L_SoundDriverVSyncOff
+	thumb_func_start SoundDriverVSyncOff
+SoundDriverVSyncOff:
+	swi 40
+	bx lr
+	thumb_func_end SoundDriverVSyncOff
+	.endif
+
+	.ifdef L_HuffUnComp
+	thumb_func_start HuffUnComp
+HuffUnComp:
+	swi 19
+	bx lr
+	thumb_func_end HuffUnComp
+	.endif
+
+	.ifdef L_SoftResetExram
+	thumb_func_start SoftResetExram
+SoftResetExram:
+	ldr r3, =REG_IME
+	mov r2, #0
+	strb r2, [r3, #0]
+	ldr r3, =SOFT_RESET_DIRECT_BUF
+	mov r2, #1
+	strb r2, [r3, #0]
+	sub r3, #SOFT_RESET_DIRECT_BUF - 0x3007f00
+	mov sp, r3
+	mov r2, #RESET_EX_WRAM_FLAG
+	bic r0, r2
+	swi 1
+	swi 0
+	.pool
+	thumb_func_end SoftResetExram
+	.endif
+
+	.ifdef L_MusicPlayerFadeOut
+	thumb_func_start MusicPlayerFadeOut
+MusicPlayerFadeOut:
+	swi 36
+	bx lr
+	thumb_func_end MusicPlayerFadeOut
+	.endif
+
+	.ifdef L_LZ77UnCompWram
+	thumb_func_start LZ77UnCompWram
+LZ77UnCompWram:
+	swi 17
+	bx lr
+	thumb_func_end LZ77UnCompWram
+	.endif
+
+	.ifdef L_SoundDriverMain
+	thumb_func_start SoundDriverMain
+SoundDriverMain:
+	swi 28
+	bx lr
+	thumb_func_end SoundDriverMain
+	.endif
+
+	.ifdef L_SoundBiasChange
+	thumb_func_start SoundBiasChange
+SoundBiasChange:
+	swi 25
+	bx lr
+	thumb_func_end SoundBiasChange
+	.endif
+
+	.ifdef L_LZ77UnCompVram
+	thumb_func_start LZ77UnCompVram
+LZ77UnCompVram:
+	swi 18
+	bx lr
+	thumb_func_end LZ77UnCompVram
+	.endif
+
+	.ifdef L_ArcTan2
+	thumb_func_start ArcTan2
+ArcTan2:
+	swi 10
+	bx lr
+	thumb_func_end ArcTan2
+	.endif
+
+	.ifdef L_MusicPlayerStop
+	thumb_func_start MusicPlayerStop
+MusicPlayerStop:
+	swi 34
+	bx lr
+	thumb_func_end MusicPlayerStop
+	.endif
+
+	.ifdef L_DivArm
+	thumb_func_start DivArm
+DivArm:
+	swi 7
+	bx lr
+	thumb_func_end DivArm
+	.endif
+
+	.ifdef L_ModArm
+	thumb_func_start ModArm
+ModArm:
+	swi 7
+	mov r0, r1
+	bx lr
+	thumb_func_end ModArm
+	.endif
+
+	.ifdef L_SoundDriverVSync
+	thumb_func_start SoundDriverVSync
+SoundDriverVSync:
+	swi 29
+	bx lr
+	thumb_func_end SoundDriverVSync
+	.endif
+
+	.ifdef L_SoundDriverInit
+	thumb_func_start SoundDriverInit
+SoundDriverInit:
+	swi 26
+	bx lr
+	thumb_func_end SoundDriverInit
+	.endif
+
+	.ifdef L_BgAffineSet
+	thumb_func_start BgAffineSet
+BgAffineSet:
+	swi 14
+	bx lr
+	thumb_func_end BgAffineSet
+	.endif
+
+	.ifdef L_Diff8bitUnFilterWram
+	thumb_func_start Diff8bitUnFilterWram
+Diff8bitUnFilterWram:
+	swi 22
+	bx lr
+	thumb_func_end Diff8bitUnFilterWram
+	.endif
+
+	.ifdef L_MultiBoot
+	thumb_func_start MultiBoot
+MultiBoot:
+	mov r1, #1
+	swi 37
+	bx lr
+	thumb_func_end MultiBoot
+	.endif
+
+	.ifdef L_MidiKey2Freq
+	thumb_func_start MidiKey2Freq
+MidiKey2Freq:
+	swi 31
+	bx lr
+	thumb_func_end MidiKey2Freq
+	.endif
+
+	.ifdef L_Div
+	thumb_func_start Div
+Div:
+	swi 6
+	bx lr
+	thumb_func_end Div
+	.endif
+
+	.ifdef L_Diff8bitUnFilterVram
+	thumb_func_start Diff8bitUnFilterVram
+Diff8bitUnFilterVram:
+	swi 23
+	bx lr
+	thumb_func_end Diff8bitUnFilterVram
+	.endif
+
+	.ifdef L_ArcTan
+	thumb_func_start ArcTan
+ArcTan:
+	swi 9
+	bx lr
+	thumb_func_end ArcTan
+	.endif
+
+	.ifdef L_ObjAffineSet
+	thumb_func_start ObjAffineSet
+ObjAffineSet:
+	swi 15
+	bx lr
+	thumb_func_end ObjAffineSet
+	.endif
+
+	.ifdef L_SoftResetRom
+	thumb_func_start SoftResetRom
+SoftResetRom:
+	ldr r3, =REG_IME
+	mov r2, #0
+	strb r2, [r3, #0]
+	ldr r3, =SOFT_RESET_DIRECT_BUF
+	mov r2, #0
+	strb r2, [r3, #0]
+	sub r3, #SOFT_RESET_DIRECT_BUF - 0x3007f00
+	mov sp, r3
+	swi 1
+	swi 0
+	.pool
+	thumb_func_end SoftResetRom
+	.endif
+
+	.ifdef L_SoundDriverMode
+	thumb_func_start SoundDriverMode
+SoundDriverMode:
+	swi 27
+	bx lr
+	thumb_func_end SoundDriverMode
+	.endif
+
+	.ifdef L_RLUnCompWram
+	thumb_func_start RLUnCompWram
+RLUnCompWram:
+	swi 20
+	bx lr
+	thumb_func_end RLUnCompWram
+	.endif
+
+	.ifdef L_BitUnPack
+	thumb_func_start BitUnPack
+BitUnPack:
+	swi 16
+	bx lr
+	thumb_func_end BitUnPack
+	.endif
+
+	.ifdef L_SoundChannelClear
+	thumb_func_start SoundChannelClear
+SoundChannelClear:
+	swi 30
+	bx lr
+	thumb_func_end SoundChannelClear
+	.endif
+
+	.ifdef L_CpuFastSet
+	thumb_func_start CpuFastSet
+CpuFastSet:
+	swi 12
+	bx lr
+	thumb_func_end CpuFastSet
+	.endif
+
+	.ifdef L_CpuSet
+	thumb_func_start CpuSet
+CpuSet:
+	swi 11
+	bx lr
+	thumb_func_end CpuSet
+	.endif
+
+	.ifdef L_Diff16bitUnFilter
+	thumb_func_start Diff16bitUnFilter
+Diff16bitUnFilter:
+	swi 24
+	bx lr
+	thumb_func_end Diff16bitUnFilter
+	.endif
+
+	.ifdef L_SoundBiasSet
+	thumb_func_start SoundBiasSet
+SoundBiasSet:
+	mov r0, #1
+	swi 25
+	bx lr
+	thumb_func_end SoundBiasSet
+	.endif
+
+	.ifdef L_MusicPlayerContinue
+	thumb_func_start MusicPlayerContinue
+MusicPlayerContinue:
+	swi 35
+	bx lr
+	thumb_func_end MusicPlayerContinue
+	.endif
+
+	.ifdef L_SoftReset
+	thumb_func_start SoftReset
+SoftReset:
+	ldr r3, =REG_IME
+	mov r2, #0
+	strb r2, [r3, #0]
+	ldr r1, =0x3007f00
+	mov sp, r1
+	swi 1
+	swi 0
+	.pool
+	thumb_func_end SoftReset
+	.endif
+
+	.ifdef L_RLUnCompVram
+	thumb_func_start RLUnCompVram
+RLUnCompVram:
+	swi 21
+	bx lr
+	thumb_func_end RLUnCompVram
+	.endif
+
+	.align 2, 0 @ Don't pad with nop