; entry.asm -- process entry for the C hello world.
;
; The C runtime's boot.obj is designed for a ROM system: _c_int00 sets SP (the
; *system* stack), calls main, calls exit (which is `for(;;)`) and ends in
; `reti`.  None of that fits a process made by the VT1200's create_process:
; the spin never yields, and `reti` returns from an interrupt that never
; happened (it pops a garbage PC -> illegal opcode).
;
; So we enter here instead: set the C program stack (STK = A14, FP = A13), call
; main, and `rets` back to the create_process trampoline -- the same return the
; xhello payload uses.  SP (the OS's interrupt stack) is left alone.
;
; _cstack is 4096 bytes; the compiler grows the program stack upward from STK.

	.text
	.globl	_start
	.globl	_main
_start:
	setf	32, 0, 1
	movi	_cstack, a14
	move	a14, a13
	calla	_main
	rets

	.bss	_cstack, 32768, 16	; 32768 bits = 4096 bytes
	.end