include all files

Makefile

@@ -0,0 +1,38 @@
+SHELL = /bin/sh
+.SUFFIXES:
+
+CC     = avr-gcc
+RM     = rm -vf
+STRIP  = avr-strip
+
+CPPFLAGS ?= -DNDEBUG
+CFLAGS   ?= -Os
+LDFLAGS  ?= -nostdlib -nostartfiles -flto
+
+CPPFLAGS += -Iinclude
+CFLAGS   += -std=gnu99 -MMD -MP
+CFLAGS   += -Wall -Wextra -Wpedantic -Wno-pointer-arith
+
+SRC := $(wildcard src/*.c src/*/*.c src/*/*/*.c src/*/*/*/*.c src/*/*/*/*/*.c src/*/*/*/*/*/*.c src/*/*/*/*/*/*/*.c src/*/*/*/*/*/*/*/*.c)
+SRC += $(wildcard src/*.S src/*/*.S src/*/*/*.S src/*/*/*/*.S src/*/*/*/*/*.S src/*/*/*/*/*/*.S src/*/*/*/*/*/*/*.S src/*/*/*/*/*/*/*/*.S)
+OBJ := $(SRC:%=obj/%.o)
+
+
+all:    bin/a.out
+clean:; @-$(RM) -r bin/ obj/
+
+bin/a.out: $(OBJ)
+	$(info [LD]	$@)
+	@mkdir -p $(@D)
+	@$(CC) -o $@ $^ $(LDFLAGS) $(LDLIBS)
+
+bin/a.hex: bin/a.out
+	$(info [STRIP]	$@)
+	@$(STRIP) -o $@ $<
+
+obj/%.o: %
+	$(info [CC]	$@)
+	@mkdir -p $(@D)
+	@$(CC) -c $(CPPFLAGS) $(CFLAGS) -o $@ $<
+
+-include $(OBJ:%.o=%.d)

include/asm.h

@@ -0,0 +1,8 @@
+/* Contains some assembly-specific instructions
+ * that ought to be beneficial*/
+#pragma once
+
+#define lo8(x)  ((x) & 0xFF)         /* Use bits 0..7 of x. */
+#define hi8(x)  (((x) >> 8) & 0xFF)  /* Use bits 8..15 of x. */
+#define hlo8(x) (((x) >> 16) & 0xFF) /* Use bits 16..23 of x. */
+#define hhi8(x) (((x) >> 24) & 0xFF) /* Use bits 24..31 of x. */

include/avr/avr128da28.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "asm.h"
+
+/* I/O addresses. */
+#define SPH    0x3E   /* Stack pointer high address. */
+#define SPL    0x3D   /* Stack pointer low address. */
+#define RAMEND 0x4000 /* The maximum address available in RAM. */

src/crt0.S

@@ -0,0 +1,17 @@
+#include "avr128da28.h"
+
+/* This section contains the executable code. */
+.section .text
+/* Entry-point as defined by the linker at address 0x00. */
+.global	_start
+_start:
+	ldi	r16,	hi8(RAMEND)
+	out	SPH,	r16
+	ldi	r16,	lo8(RAMEND)
+	out	SPL,	r16
+
+	rcall	main
+
+.section	.data	/* Initialised data */
+.section	.bss	/* Uninitialised data*/
+.section	.rodata	/* Initialised read-only data */

src/main.c

@@ -0,0 +1,7 @@
+#include "types.h"
+
+int main(void) __attribute__((noreturn));
+int main(void)
+{
+	while (1);
+}

src/types.h

@@ -0,0 +1,47 @@
+#pragma once
+
+typedef long long llong;
+
+typedef unsigned char      uchar;
+typedef unsigned short     ushort;
+typedef unsigned int       uint;
+typedef unsigned long      ulong;
+typedef unsigned long long ullong;
+
+typedef __INT8_TYPE__   i8;
+typedef __INT16_TYPE__  i16;
+typedef __INT32_TYPE__  i32;
+typedef __INT64_TYPE__  i64;
+typedef __UINT8_TYPE__  u8;
+typedef __UINT16_TYPE__ u16;
+typedef __UINT32_TYPE__ u32;
+typedef __UINT64_TYPE__ u64;
+
+typedef __INTPTR_TYPE__  intptr;
+typedef __UINTPTR_TYPE__ uintptr;
+
+#if __SIZEOF_SIZE_T__ == 8
+typedef i64 ssize;
+typedef u64 usize;
+#elif __SIZEOF_SIZE_T__ == 4
+typedef i32 ssize;
+typedef u32 usize;
+#elif __SIZEOF_SIZE_T__ == 2
+typedef i16 ssize;
+typedef u16 usize;
+#elif __SIZEOF_SIZE_T__ == 1
+typedef i8 ssize;
+typedef u8 usize;
+#else
+#error could not determine the appropriate type for usize and ssize
+#endif
+
+#if __SIZEOF_FLOAT__ == 4
+typedef float f32;
+#endif
+
+#if __SIZEOF_DOUBLE__ == 8
+typedef double f64;
+#elif __SIZEOF_LONG_DOUBLE__ == 8
+typedef long double f64;
+#endif