Add stages and a rakefile

boot/stage2.elna

@@ -0,0 +1,32 @@
+.global _start, source_code
+
+.equ SYS_READ, 63
+.equ SYS_WRITE, 64
+.equ SYS_EXIT, 93
+.equ STDIN, 0
+.equ STDOUT, 1
+.equ STDERR, 2
+
+.equ SOURCE_BUFFER_SIZE, 2048
+
+.section .bss
+.type source_code, @object
+.size source_code, SOURCE_BUFFER_SIZE
+source_code: .zero SOURCE_BUFFER_SIZE
+
+.section .text
+
+_start:
+	# Read the source from the standard input.
+	la a0, source_code
+	li a1, SOURCE_BUFFER_SIZE # Buffer size.
+	call read_file
+
+	# Write the source to the standard output.
+	mv a1, a0
+	la a0, source_code
+	call write_out
+
+	# Call exit.
+	li a0, 0   # Use 0 return code.
+	call exit