Add arch-specific Makefiles

Makefile

@@ -24,13 +24,16 @@
 #
 
 AVR_CC ?= $(shell which avr-gcc)
+CC = $(AVR_CC)
 AVR_LD ?= $(shell which avr-gcc)
+LD = $(AVR_LD)
 AVR_OBJCOPY ?= $(shell which avr-objcopy)
+OBJCOPY = $(AVR_OBJCOPY)
 
 EXTRA_CFLAGS ?=
 CFLAGS = $(EXTRA_CFLAGS)
 
-CFLAGS += -nostartfiles -nostdlib -nodefaultlibs -fno-builtin
+CFLAGS += -g -nodefaultlibs -fno-builtin
 CFLAGS += -I$(PWD)/include
 CFLAGS += -DARCH=$(ARCH)
 CFLAGS += -mmcu=$(ARCH) -fpack-struct -std=gnu11
@@ -46,31 +49,34 @@ CFLAGS += -Wall \
 	-Waggregate-return -Winline -Wcast-align
 
 ifdef DEBUG
-CFLAGS += -DDEBUG
+    CFLAGS += -DDEBUG
 endif
 
 EXTRA_LDFLAGS ?=
 LDFLAGS = $(EXTRA_LDFLAGS)
 
 LDFLAGS += \
-	-mmcu=$(ARDIX_ARCH) \
-	-nostdlib \
+	-mmcu=$(ARCH) \
 	-nodefaultlibs
 
+ARDIX_ASM_SOURCES =
+include arch/Makefile
+
 ARDIX_SOURCES =
 include init/Makefile
 ARDIX_OBJS = $(ARDIX_SOURCES:.c=.o)
+ARDIX_ASM_OBJS = $(ARDIX_ASM_SOURCES:.S=.o)
 
-%.o: %.c
-	$(AVR_CC) -c -Os -o $@ $(CFLAGS) $<
+%.o: %.S | %.c
+	$(CC) -c -Os -o $@ $(CFLAGS) $<
 
-ardix.elf: $(ARDIX_OBJS)
-	$(AVR_LD) $(LDFLAGS) -o $@ $^
+ardix.elf: $(ARDIX_OBJS) $(ARDIX_ASM_OBJS)
+	$(LD) $(LDFLAGS) -o $@ $^
 
 ardix.hex: ardix.elf
-	$(AVR_OBJCOPY) -O ihex -R .eeprom $^ $@
+	$(OBJCOPY) -O ihex -R .eeprom $^ $@
 
 clean:
-	rm -f ardix.elf ardix.hex $(shell find . -name '*.o')
+	rm -f ardix.elf ardix.hex $(ARDIX_OBJS) $(ARDIX_ASM_OBJS)
 
 all: ardix.hex

arch/Makefile

@@ -0,0 +1,30 @@
+#
+# Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials
+#    provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+# WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+ifeq ($(ARCH), at91sam3x8e)
+    include arch/at91sam3x8e/Makefile
+else
+    $(error ARCH is not set to a supported value)
+endif

arch/at91sam3x8e/Makefile

@@ -0,0 +1,29 @@
+#
+# Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted
+# provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+#    conditions and the following disclaimer in the documentation and/or other materials
+#    provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific prior
+#    written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+# WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+ARDIX_ARCH_PWD = $(PWD)/arch/at91sam3x8e
+
+CFLAGS += \
+	-DARCH_AT91SAM3X8E