The first step in creating a thread library.

The difference between this thread library and the existing ones like pthreads
is the necessity of informing the library about the address range of the stack
and the l4 specific utcb. Utcb has not been supported yet. As for stack, there
is also a drawback: library does not support mapping. In other words, the stack
area in question has to be already mapped-in. Thus, for now we only support
threads sharing their address spaces: TC_SHARE_SPACE. In this respect, it is
very similar to pthreads.

conts/libl4thread/src/arch-arm/new_thread.S

@@ -0,0 +1,11 @@
+#include <l4lib/arch/asm.h>
+
+
+BEGIN_PROC(setup_new_thread)
+	ldr	r0, [sp], #-4		@ Load first argument.
+	mov	lr, pc			@ Save return address
+	ldr	pc, [sp], #-4		@ Load function pointer from stack
+new_thread_exit:
+	b	new_thread_exit		@ We infinitely loop for now.
+END_PROC(setup_new_thread)
+