upload tests for mul

cMIPS/tests/mul.expected

+ok

cMIPS/tests/mul.s

+	##
+	## test instruction MUL: R[rd] <= R[rs] * R[rt]
+	##
+	.include "cMIPS.s"
+	.text
+	.align 2
+	.set noat
+	.globl _start
+	.ent _start
+_start: la $20, x_IO_BASE_ADDR
+	
+	##
+	## let's check the simple ones: 1*5, 5*1, 1*0, 0*1
+	##
+
+	li  $3, 1
+	li  $4, 5
+	li  $5, (5*1)
+	mul $6, $4, $3
+	li  $30, '1'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, 5
+	li  $4, 1
+	li  $5, (5*1)
+	mul $6, $4, $3
+	li  $30, '2'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, 1
+	li  $4, 0
+	li  $5, (1*0)
+	mul $6, $4, $3
+	li  $30, '3'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, 0
+	li  $4, 1
+	li  $5, (0*1)
+	mul $6, $4, $3
+	li  $30, '4'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	##
+	## let's check the limits: 1*ffff.ffff, ffff.ffff*1
+	##
+	li  $3, 1
+	li  $4, -1
+	li  $5, (-1*1)
+	mul $6, $4, $3
+	li  $30, '5'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, -1
+	li  $4, 1
+	li  $5, (-1*1)
+	mul $6, $4, $3
+	li  $30, '6'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, 2
+	li  $4, -1
+	li  $5, (2 * -1)
+	mul $6, $4, $3
+	li  $30, '7'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, -1
+	li  $4, 2
+	li  $5, (-1 * 2)
+	mul $6, $4, $3
+	li  $30, '8'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, -1
+	li  $4, -1
+	li  $5, (-1 * -1)
+	mul $6, $4, $3
+	li  $30, '9'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+	li  $3, -1
+	li  $4, -1
+	li  $5, (-1 * -1)
+	mul $6, $4, $3
+	li  $30, 'a'
+	#sw  $6, 0($20)
+	
+	bne $5, $6, error
+	nop
+
+
+ok:	li   $19, 'o'
+        sw   $19, x_IO_ADDR_RANGE($20)
+        li   $19, 'k'
+        sw   $19, x_IO_ADDR_RANGE($20)
+	li   $19, '\n'
+        sw   $19, x_IO_ADDR_RANGE($20)
+
+	j _end
+	
+error:	
+	li   $19, 'e'
+        sw   $19, x_IO_ADDR_RANGE($20)
+        li   $19, 'r'
+        sw   $19, x_IO_ADDR_RANGE($20)
+	sw   $19, x_IO_ADDR_RANGE($20)
+        sw   $30, x_IO_ADDR_RANGE($20)
+	li   $19, '\n'
+        sw   $19, x_IO_ADDR_RANGE($20)
+
+	
+_end:	nop
+	nop
+	nop
+	nop
+	wait
+	nop
+	.end _start
+
+