// loader2 by abu <x@sunkone.cjb.net> http://sunkone.cjb.net/psp/
// load and jump to 0x08556000

start:	
	slt	$4,$0,$29	// $4 = 1
	sll	$4,$4,5		// $4 = 32
	neg	$4,$4		// $4 = -32
	add	$4,$4,$29	// $4 = sp - 32 = filename
	
	slt	$5,$0,$29	// $5 = 1 = open flags

	syscall	0x208f		// open
	nop

	addu	$4,$0,$2	// fd

	slt	$5,$0,$29	// $5 = 1
	add	$6,$0,$5	// $6 = 1
	sll	$6,$6,2		// $6 = 4
	add	$6,$6,$5	// $6 = 5
	sll	$5,$5,7		// $5 = 0x80
	add	$5,$5,$6	// $5 = 0x85
	sll	$5,$5,4		// $5 = 0x850
	add	$5,$5,$6	// $5 = 0x855
	sll	$5,$5,4		// $5 = 0x8550
	slt	$6,$0,$29	// $6 = 1
	add	$6,$6,$6	// $6 = 2
	add	$5,$5,$6	// $5 = 0x8552
	add	$5,$5,$6	// $5 = 0x8554
	add	$5,$5,$6	// $5 = 0x8556
	sll	$5,$5,12	// $5 = 0x08556000

	slt	$6,$0,$29	// $6 = 1
	sll	$6,$6,16	// 0x10000 = 64k
	syscall	0x2091		// read
	nop
	syscall	0x20c7		// sceKernelDcacheWritebackInvalidateAll
	nop			// are these necessary?
	syscall	0x20cc		// sceKernelIcacheInvalidateAll
	nop

	// this calculation is tedious but there aren't regs to save it?
	slt	$5,$0,$29	// $5 = 1
	add	$6,$0,$5	// $6 = 1
	sll	$6,$6,2		// $6 = 4
	add	$6,$6,$5	// $6 = 5
	sll	$5,$5,7		// $5 = 0x80
	add	$5,$5,$6	// $5 = 0x85
	sll	$5,$5,4		// $5 = 0x850
	add	$5,$5,$6	// $5 = 0x855
	sll	$5,$5,4		// $5 = 0x8550
	slt	$6,$0,$29	// $6 = 1
	add	$6,$6,$6	// $6 = 2
	add	$5,$5,$6	// $5 = 0x8552
	add	$5,$5,$6	// $5 = 0x8554
	add	$5,$5,$6	// $5 = 0x8556
	sll	$5,$5,12	// $5 = 0x08556000
	jr	$5
	nop