diff --git a/exosphere/sdmmc_test/Makefile b/exosphere/sdmmc_test/Makefile
new file mode 100644
index 000000000..4bfed891e
--- /dev/null
+++ b/exosphere/sdmmc_test/Makefile
@@ -0,0 +1,108 @@
+#---------------------------------------------------------------------------------
+# Define the atmosphere board and cpu
+#---------------------------------------------------------------------------------
+export ATMOSPHERE_BOARD := nx-hac-001
+export ATMOSPHERE_CPU   := arm7tdmi
+
+#---------------------------------------------------------------------------------
+# pull in common atmosphere configuration
+#---------------------------------------------------------------------------------
+include  $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/../../libraries/config/templates/exosphere.mk
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export TOPDIR	:=	$(CURDIR)
+export DEPSDIR  :=  $(CURDIR)/$(BUILD)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+CFILES      :=	$(call FIND_SOURCE_FILES,$(SOURCES),c)
+CPPFILES    :=	$(call FIND_SOURCE_FILES,$(SOURCES),cpp)
+SFILES      :=	$(call FIND_SOURCE_FILES,$(SOURCES),s)
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES))
+export OFILES_SRC	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+export OFILES 	:=	$(OFILES_BIN) $(OFILES_SRC)
+export HFILES_BIN	:=	$(addsuffix .h,$(subst .,_,$(subst -,_,$(BINFILES))))
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I.
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib -L$(dir)/$(ATMOSPHERE_LIBRARY_DIR))
+
+.PHONY: $(BUILD) clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD) check_libexo
+
+$(BUILD): check_libexo
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+check_libexo:
+	@$(MAKE) --no-print-directory -C ../../libraries/libexosphere arm
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(OUTPUT).bin $(OUTPUT).elf *.lz4
+
+#---------------------------------------------------------------------------------
+else
+.PHONY:	all
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+all	:	$(OUTPUT).bin
+
+$(OUTPUT).bin	:	$(OUTPUT).elf
+	$(OBJCOPY) -S -O binary --set-section-flags .bss=alloc,load,contents $< $@
+	@echo built ... $(notdir $@)
+
+$(OUTPUT).elf	:	$(OFILES) ../../../libraries/libexosphere/$(ATMOSPHERE_LIBRARY_DIR)/libexosphere.a
+
+%.elf:
+	@echo linking $(notdir $@)
+	$(LD) $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+	@$(NM) -CSn $@ > $(notdir $*.lst)
+
+$(OFILES_SRC)	: $(HFILES_BIN)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	%_bin.h:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------
diff --git a/exosphere/sdmmc_test/sdmmc_test.ld b/exosphere/sdmmc_test/sdmmc_test.ld
new file mode 100644
index 000000000..181d33330
--- /dev/null
+++ b/exosphere/sdmmc_test/sdmmc_test.ld
@@ -0,0 +1,194 @@
+OUTPUT_ARCH(arm)
+ENTRY(_ZN3ams10sdmmc_test5StartEv)
+
+MEMORY
+{
+    NULL     : ORIGIN = 0,          LENGTH = 4K
+    test_fw  : ORIGIN = 0x40010000, LENGTH = 32K
+}
+
+
+SECTIONS
+{
+	/* =========== CODE section =========== */
+	PROVIDE(__start__ = ORIGIN(test_fw));
+	. = __start__;
+	__code_start = . ;
+
+	.crt0 :
+	{
+		KEEP (*(.crt0 .crt0.*))
+		. = ALIGN(8);
+	} >test_fw
+
+	.vectors :
+	{
+		KEEP (*(.vectors .vectors.*))
+		. = ALIGN(8);
+	} >test_fw
+
+	.text :
+	{
+		*(.text.unlikely .text.*_unlikely .text.unlikely.*)
+		*(.text.exit .text.exit.*)
+		*(.text.startup .text.startup.*)
+		*(.text.hot .text.hot.*)
+		*(.text .stub .text.* .gnu.linkonce.t.*)
+		. = ALIGN(8);
+	} >test_fw
+
+	.init :
+	{
+		KEEP( *(.init) )
+		. = ALIGN(8);
+	} >test_fw
+
+	.plt :
+	{
+		*(.plt)
+		*(.iplt)
+		. = ALIGN(8);
+	} >test_fw
+
+	.fini :
+	{
+		KEEP( *(.fini) )
+		. = ALIGN(8);
+	} >test_fw
+
+
+	/* =========== RODATA section =========== */
+	. = ALIGN(8);
+	__rodata_start = . ;
+
+	.rodata :
+	{
+		*(.rodata .rodata.* .gnu.linkonce.r.*)
+		. = ALIGN(8);
+	} >test_fw
+
+	.eh_frame_hdr     : { __eh_frame_hdr_start = .; *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) __eh_frame_hdr_end = .; } >test_fw
+	.eh_frame         : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) } >test_fw
+	.gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) } >test_fw
+	.gnu_extab        : ONLY_IF_RO { *(.gnu_extab*) } >test_fw
+
+	.hash              : { *(.hash) } >test_fw
+
+	/* =========== DATA section =========== */
+	. = ALIGN(8);
+	__data_start = . ;
+
+	.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) } >test_fw
+	.gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) } >test_fw
+	.gnu_extab : ONLY_IF_RW { *(.gnu_extab*) } >test_fw
+	.exception_ranges : ONLY_IF_RW { *(.exception_ranges .exception_ranges*) } >test_fw
+
+	.preinit_array ALIGN(8) :
+	{
+		PROVIDE (__preinit_array_start = .);
+		KEEP (*(.preinit_array))
+		PROVIDE (__preinit_array_end = .);
+	} >test_fw
+
+	.init_array ALIGN(8) :
+	{
+		PROVIDE (__init_array_start = .);
+		KEEP (*(SORT(.init_array.*)))
+		KEEP (*(.init_array))
+		PROVIDE (__init_array_end = .);
+	} >test_fw
+
+	.fini_array ALIGN(8) :
+	{
+		PROVIDE (__fini_array_start = .);
+		KEEP (*(.fini_array))
+		KEEP (*(SORT(.fini_array.*)))
+		PROVIDE (__fini_array_end = .);
+	} >test_fw
+
+	.ctors ALIGN(8) :
+	{
+		KEEP (*crtbegin.o(.ctors)) /* MUST be first -- GCC requires it */
+		KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
+		KEEP (*(SORT(.ctors.*)))
+		KEEP (*(.ctors))
+	} >test_fw
+
+	.dtors ALIGN(8) :
+	{
+		KEEP (*crtbegin.o(.dtors))
+		KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
+		KEEP (*(SORT(.dtors.*)))
+		KEEP (*(.dtors))
+	} >test_fw
+
+	__got_start__ = .;
+
+	.got            : { *(.got) *(.igot) } >test_fw
+	.got.plt        : { *(.got.plt)  *(.igot.plt) } >test_fw
+
+	__got_end__ = .;
+
+	.data ALIGN(8) :
+	{
+		*(.data .data.* .gnu.linkonce.d.*)
+		SORT(CONSTRUCTORS)
+	} >test_fw
+
+	__bss_start__ = .;
+	.bss ALIGN(8) :
+	{
+		*(.dynbss)
+		*(.bss .bss.* .gnu.linkonce.b.*)
+		*(COMMON)
+		. = ALIGN(16);
+	} >test_fw
+	__bss_end__ = .;
+
+	__end__ = ABSOLUTE(.) ;
+
+    __total_size__ = (__end__ - __start__);
+
+    __stack_top__    = 0x40031000;
+    __stack_bottom__ = 0x40030000;
+
+	/* ==================
+	   ==== Metadata ====
+	   ================== */
+
+	/* Discard sections that difficult post-processing */
+	/DISCARD/ : { *(.group .comment .note .interp) }
+
+	/* Stabs debugging sections. */
+	.stab          0 : { *(.stab) }
+	.stabstr       0 : { *(.stabstr) }
+	.stab.excl     0 : { *(.stab.excl) }
+	.stab.exclstr  0 : { *(.stab.exclstr) }
+	.stab.index    0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+
+	/* DWARF debug sections.
+	   Symbols in the DWARF debugging sections are relative to the beginning
+	   of the section so we begin them at 0. */
+
+	/* DWARF 1 */
+	.debug          0 : { *(.debug) }
+	.line           0 : { *(.line) }
+
+	/* GNU DWARF 1 extensions */
+	.debug_srcinfo  0 : { *(.debug_srcinfo) }
+	.debug_sfnames  0 : { *(.debug_sfnames) }
+
+	/* DWARF 1.1 and DWARF 2 */
+	.debug_aranges  0 : { *(.debug_aranges) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+
+	/* DWARF 2 */
+	.debug_info     0 : { *(.debug_info) }
+	.debug_abbrev   0 : { *(.debug_abbrev) }
+	.debug_line     0 : { *(.debug_line) }
+	.debug_frame    0 : { *(.debug_frame) }
+	.debug_str      0 : { *(.debug_str) }
+	.debug_loc      0 : { *(.debug_loc) }
+	.debug_macinfo  0 : { *(.debug_macinfo) }
+}
\ No newline at end of file
diff --git a/exosphere/sdmmc_test/sdmmc_test.specs b/exosphere/sdmmc_test/sdmmc_test.specs
new file mode 100644
index 000000000..72d846e06
--- /dev/null
+++ b/exosphere/sdmmc_test/sdmmc_test.specs
@@ -0,0 +1,7 @@
+%rename link old_link
+
+*link:
+%(old_link) -T %:getenv(TOPDIR /sdmmc_test.ld) --gc-sections --nmagic -nostdlib -nostartfiles
+
+*startfile:
+crti%O%s crtbegin%O%s
diff --git a/exosphere/sdmmc_test/source/sdmmc_test_main.cpp b/exosphere/sdmmc_test/source/sdmmc_test_main.cpp
new file mode 100644
index 000000000..e03e672d5
--- /dev/null
+++ b/exosphere/sdmmc_test/source/sdmmc_test_main.cpp
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <exosphere.hpp>
+
+namespace ams::sdmmc_test {
+
+    namespace {
+
+        constexpr inline const uintptr_t PMC = secmon::MemoryRegionPhysicalDevicePmc.GetAddress();
+
+        constexpr inline auto Port = sdmmc::Port_Mmc0;
+        alignas(8) constinit u8 g_mmc_work_buffer[sdmmc::MmcWorkBufferSize];
+
+        constexpr inline u32 SectorIndex = 0;
+        constexpr inline u32 SectorCount = 2;
+
+        NORETURN void PmcMainReboot() {
+            /* Write enable to MAIN_RESET. */
+            reg::Write(PMC + APBDEV_PMC_CNTRL, PMC_REG_BITS_ENUM(CNTRL_MAIN_RESET, ENABLE));
+
+            /* Wait forever until we're reset. */
+            AMS_INFINITE_LOOP();
+        }
+
+        void CheckResult(const Result result) {
+            volatile u32 * const DEBUG = reinterpret_cast<volatile u32 *>(0x4003C000);
+            if (R_FAILED(result)) {
+                DEBUG[1] = result.GetValue();
+                PmcMainReboot();
+            }
+        }
+
+    }
+
+    void Main() {
+        /* Debug signaler. */
+        volatile u32 * const DEBUG = reinterpret_cast<volatile u32 *>(0x4003C000);
+        DEBUG[0] = 0;
+        DEBUG[1] = 0xAAAAAAAA;
+
+        /* Initialize sdmmc library. */
+        sdmmc::Initialize(Port);
+        DEBUG[0] = 1;
+
+        sdmmc::SetMmcWorkBuffer(Port, g_mmc_work_buffer, sizeof(g_mmc_work_buffer));
+        DEBUG[0] = 2;
+
+        Result result = sdmmc::Activate(Port);
+        DEBUG[0] = 3;
+        CheckResult(result);
+
+        /* Select user data partition. */
+        result = sdmmc::SelectMmcPartition(Port, sdmmc::MmcPartition_UserData);
+        DEBUG[0] = 4;
+        CheckResult(result);
+
+        /* Read the first two sectors from disk. */
+        void * const sector_dst = reinterpret_cast<void *>(0x40038000);
+        result = sdmmc::Read(sector_dst, SectorCount * sdmmc::SectorSize, Port, SectorIndex, SectorCount);
+        DEBUG[0] = 5;
+        CheckResult(result);
+
+        /* Perform a reboot. */
+        DEBUG[1] = 0;
+        PmcMainReboot();
+    }
+
+    NORETURN void ExceptionHandler() {
+        PmcMainReboot();
+    }
+
+}
+
+namespace ams::diag {
+
+    void AbortImpl() {
+        sdmmc_test::ExceptionHandler();
+    }
+
+}
diff --git a/exosphere/sdmmc_test/source/sdmmc_test_start.s b/exosphere/sdmmc_test/source/sdmmc_test_start.s
new file mode 100644
index 000000000..69c1204f7
--- /dev/null
+++ b/exosphere/sdmmc_test/source/sdmmc_test_start.s
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+.section    .crt0.text._ZN3ams10sdmmc_test5StartEv, "ax", %progbits
+.align      3
+.global     _ZN3ams10sdmmc_test5StartEv
+_ZN3ams10sdmmc_test5StartEv:
+    /* Switch to system mode, mask all interrupts, clear all flags */
+    msr cpsr_cxsf, #0xDF
+
+    /* Set the stack pointer. */
+    ldr sp, =__stack_top__
+
+    /* Set our link register to the exception handler. */
+    ldr lr, =_ZN3ams10sdmmc_test16ExceptionHandlerEv
+
+    /* Call init array functions. */
+    bl __libc_init_array
+
+    /* Invoke main. */
+    b _ZN3ams10sdmmc_test4MainEv
+
+    /* Infinite loop. */
+    2: b 2b
\ No newline at end of file
diff --git a/exosphere/warmboot/source/warmboot_start.s b/exosphere/warmboot/source/warmboot_start.s
index 18070e04a..dc6a56c2e 100644
--- a/exosphere/warmboot/source/warmboot_start.s
+++ b/exosphere/warmboot/source/warmboot_start.s
@@ -30,7 +30,7 @@ _ZN3ams8warmboot5StartEv:
 
     /* Invoke main. */
     ldr r0, =_metadata
-    bl _ZN3ams8warmboot4MainEPKNS0_8MetadataE
+    b _ZN3ams8warmboot4MainEPKNS0_8MetadataE
 
     /* Infinite loop. */
     1: b 1b
\ No newline at end of file
diff --git a/libraries/libexosphere/arm.mk b/libraries/libexosphere/arm.mk
index f82386e0f..a9b50909c 100644
--- a/libraries/libexosphere/arm.mk
+++ b/libraries/libexosphere/arm.mk
@@ -112,6 +112,7 @@ $(OFILES)	:	$(GCH_FILES)
 $(OFILES_SRC)	: $(HFILES_BIN)
 
 libc.o: CFLAGS += -fno-builtin -fno-lto
+libgcc_division.arch.arm.o: CFLAGS += -fno-builtin -fno-lto
 
 #---------------------------------------------------------------------------------
 %_bin.h %.bin.o	:	%.bin
diff --git a/libraries/libexosphere/source/libc/libexo_cxx.cpp b/libraries/libexosphere/source/libc/libexo_cxx.cpp
new file mode 100644
index 000000000..64efc6786
--- /dev/null
+++ b/libraries/libexosphere/source/libc/libexo_cxx.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <exosphere.hpp>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* cxx implementation details to be stubbed here, as needed. */
+void __cxa_pure_virtual() { AMS_ABORT("pure virtual function call"); }
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
diff --git a/libraries/libexosphere/source/libc/libgcc_division.arch.arm.c b/libraries/libexosphere/source/libc/libgcc_division.arch.arm.c
new file mode 100644
index 000000000..22bc673a1
--- /dev/null
+++ b/libraries/libexosphere/source/libc/libgcc_division.arch.arm.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2014, STMicroelectronics International N.V.
+ */
+
+/*
+ * Form ABI specifications:
+ *      int __aeabi_idiv(int numerator, int denominator);
+ *     unsigned __aeabi_uidiv(unsigned numerator, unsigned denominator);
+ *
+ *     typedef struct { int quot; int rem; } idiv_return;
+ *     typedef struct { unsigned quot; unsigned rem; } uidiv_return;
+ *
+ *     __value_in_regs idiv_return __aeabi_idivmod(int numerator,
+ *     int *denominator);
+ *     __value_in_regs uidiv_return __aeabi_uidivmod(unsigned *numerator,
+ *     unsigned denominator);
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* struct qr - stores qutient/remainder to handle divmod EABI interfaces. */
+struct qr {
+	unsigned q;		/* computed quotient */
+	unsigned r;		/* computed remainder */
+	unsigned q_n;		/* specficies if quotient shall be negative */
+	unsigned r_n;		/* specficies if remainder shall be negative */
+};
+
+static void uint_div_qr(unsigned numerator, unsigned denominator,
+			struct qr *qr);
+
+/* returns in R0 and R1 by tail calling an asm function */
+unsigned __aeabi_uidivmod(unsigned numerator, unsigned denominator);
+
+unsigned __aeabi_uidiv(unsigned numerator, unsigned denominator);
+
+/* returns in R0 and R1 by tail calling an asm function */
+signed __aeabi_idivmod(signed numerator, signed denominator);
+
+signed __aeabi_idiv(signed numerator, signed denominator);
+
+/*
+ * __ste_idivmod_ret_t __aeabi_idivmod(signed numerator, signed denominator)
+ * Numerator and Denominator are received in R0 and R1.
+ * Where __ste_idivmod_ret_t is returned in R0 and R1.
+ *
+ * __ste_uidivmod_ret_t __aeabi_uidivmod(unsigned numerator,
+ *                                       unsigned denominator)
+ * Numerator and Denominator are received in R0 and R1.
+ * Where __ste_uidivmod_ret_t is returned in R0 and R1.
+ */
+#ifdef __GNUC__
+signed ret_idivmod_values(signed quotient, signed remainder);
+unsigned ret_uidivmod_values(unsigned quotient, unsigned remainder);
+#else
+#error "Compiler not supported"
+#endif
+
+static void division_qr(unsigned n, unsigned p, struct qr *qr)
+{
+	unsigned i = 1, q = 0;
+	if (p == 0) {
+		qr->r = 0xFFFFFFFF;	/* division by 0 */
+		return;
+	}
+
+	while ((p >> 31) == 0) {
+		i = i << 1;	/* count the max division steps */
+		p = p << 1;     /* increase p until it has maximum size*/
+	}
+
+	while (i > 0) {
+		q = q << 1;	/* write bit in q at index (size-1) */
+		if (n >= p)
+		{
+			n -= p;
+			q++;
+		}
+		p = p >> 1; 	/* decrease p */
+		i = i >> 1; 	/* decrease remaining size in q */
+	}
+	qr->r = n;
+	qr->q = q;
+}
+
+static void uint_div_qr(unsigned numerator, unsigned denominator, struct qr *qr)
+{
+
+	division_qr(numerator, denominator, qr);
+
+	/* negate quotient and/or remainder according to requester */
+	if (qr->q_n)
+		qr->q = -qr->q;
+	if (qr->r_n)
+		qr->r = -qr->r;
+}
+
+unsigned __aeabi_uidiv(unsigned numerator, unsigned denominator)
+{
+	struct qr qr = { .q_n = 0, .r_n = 0 };
+
+	uint_div_qr(numerator, denominator, &qr);
+
+	return qr.q;
+}
+
+unsigned __aeabi_uidivmod(unsigned numerator, unsigned denominator)
+{
+	struct qr qr = { .q_n = 0, .r_n = 0 };
+
+	uint_div_qr(numerator, denominator, &qr);
+
+	return ret_uidivmod_values(qr.q, qr.r);
+}
+
+signed __aeabi_idiv(signed numerator, signed denominator)
+{
+	struct qr qr = { .q_n = 0, .r_n = 0 };
+
+	if (((numerator < 0) && (denominator > 0)) ||
+	    ((numerator > 0) && (denominator < 0)))
+		qr.q_n = 1;	/* quotient shall be negate */
+	if (numerator < 0) {
+		numerator = -numerator;
+		qr.r_n = 1;	/* remainder shall be negate */
+	}
+	if (denominator < 0)
+		denominator = -denominator;
+
+	uint_div_qr(numerator, denominator, &qr);
+
+	return qr.q;
+}
+
+signed __aeabi_idivmod(signed numerator, signed denominator)
+{
+	struct qr qr = { .q_n = 0, .r_n = 0 };
+
+	if (((numerator < 0) && (denominator > 0)) ||
+	    ((numerator > 0) && (denominator < 0)))
+		qr.q_n = 1;	/* quotient shall be negate */
+	if (numerator < 0) {
+		numerator = -numerator;
+		qr.r_n = 1;	/* remainder shall be negate */
+	}
+	if (denominator < 0)
+		denominator = -denominator;
+
+	uint_div_qr(numerator, denominator, &qr);
+
+	return ret_idivmod_values(qr.q, qr.r);
+}
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
\ No newline at end of file
diff --git a/libraries/libexosphere/source/libc/libgcc_division_asm.arch.arm.s b/libraries/libexosphere/source/libc/libgcc_division_asm.arch.arm.s
new file mode 100644
index 000000000..a0acbace0
--- /dev/null
+++ b/libraries/libexosphere/source/libc/libgcc_division_asm.arch.arm.s
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (c) 2014, STMicroelectronics International N.V.
+ */
+
+/*
+ * signed ret_idivmod_values(signed quot, signed rem);
+ * return quotient and remaining the EABI way (regs r0,r1)
+ */
+.section    .text.ret_idivmod_values, "ax", %progbits
+.globl ret_idivmod_values
+.align      0
+.syntax unified
+ret_idivmod_values:
+    bx lr
+.type ret_idivmod_values, %function
+.size ret_idivmod_values, .-ret_idivmod_values
+
+/*
+ * unsigned ret_uidivmod_values(unsigned quot, unsigned rem);
+ * return quotient and remaining the EABI way (regs r0,r1)
+ */
+.section    .text.ret_uidivmod_values, "ax", %progbits
+.globl ret_uidivmod_values
+.align      0
+.syntax unified
+ret_uidivmod_values:
+    bx lr
+.type ret_uidivmod_values, %function
+.size ret_uidivmod_values, .-ret_uidivmod_values
diff --git a/libraries/libexosphere/source/libc/libgcc_thumb_case.arch.arm.s b/libraries/libexosphere/source/libc/libgcc_thumb_case.arch.arm.s
new file mode 100644
index 000000000..2658ad61b
--- /dev/null
+++ b/libraries/libexosphere/source/libc/libgcc_thumb_case.arch.arm.s
@@ -0,0 +1,35 @@
+/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
+This file is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+This file is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+
+.section    .text.__gnu_thumb1_case_uqi, "ax", %progbits
+.globl __gnu_thumb1_case_uqi
+.align      0
+.thumb_func
+.syntax unified
+__gnu_thumb1_case_uqi:
+    push    {r1}
+    mov     r1, lr
+    lsrs    r1, r1, #1
+    lsls    r1, r1, #1
+    ldrb    r1, [r1, r0]
+    lsls    r1, r1, #1
+    add     lr, lr, r1
+    pop     {r1}
+    bx      lr
+.type __gnu_thumb1_case_uqi, %function
+.size __gnu_thumb1_case_uqi, .-__gnu_thumb1_case_uqi