include all files

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