bit of evaling
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@ -65,9 +65,11 @@ module Arm
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# assumes string in r0 and r1 and moves them along for the syscall
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def write_stdout block
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block.add_code mov( :r2 , right: :r1 )
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block.add_code mov( :r1 , right: :r0 )
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block.add_code mov( :r0 , right: 1 ) # 1 == stdout
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block.instance_eval do
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mov( :r2 , right: :r1 )
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mov( :r1 , right: :r0 )
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mov( :r0 , right: 1 ) # 1 == stdout
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end
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syscall( block , 4 )
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end
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@ -79,17 +81,19 @@ module Arm
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# Note about division: devision is MUCH more expensive than one would have thought
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# And coding it is a bit of a mind leap: it's all about finding a a result that gets the
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# remainder smaller than an int. i'll post some links sometime. This is from the arm manual
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block.add_code sub( remainder , left: number , right: 10 )
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block.add_code sub( number , left: number , right: number , shift_lsr: 2)
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block.add_code add( number , left: number , right: number , shift_lsr: 4)
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block.add_code add( number , left: number , right: number , shift_lsr: 8)
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block.add_code add( number , left: number , right: number , shift_lsr: 16)
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block.add_code mov( number , right: number , shift_lsr: 3)
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tmp = Vm::Integer.new( remainder.register + 1)
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block.add_code add( tmp , left: number , right: number , shift_lsl: 2)
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block.add_code sub( remainder , left: remainder , right: tmp , shift_lsl: 1 , update_status: 1)
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block.add_code add( number , left: number, right: 1 , condition_code: :pl )
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block.add_code add( remainder , left: remainder , right: 10 , condition_code: :mi )
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block.instance_eval do
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sub( remainder , left: number , right: 10 )
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sub( number , left: number , right: number , shift_lsr: 2)
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add( number , left: number , right: number , shift_lsr: 4)
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add( number , left: number , right: number , shift_lsr: 8)
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add( number , left: number , right: number , shift_lsr: 16)
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mov( number , right: number , shift_lsr: 3)
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tmp = Vm::Integer.new( remainder.register + 1)
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add( tmp , left: number , right: number , shift_lsl: 2)
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sub( remainder , left: remainder , right: tmp , shift_lsl: 1 , update_status: 1)
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add( number , left: number, right: 1 , condition_code: :pl )
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add( remainder , left: remainder , right: 10 , condition_code: :mi )
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end
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end
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def syscall block , num
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@ -38,16 +38,18 @@ module Core
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buffer = Vm::StringConstant.new(" ")
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context.program.add_object buffer
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str_addr = Vm::Integer.new(0) # address of the
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reg1 = Vm::Integer.new(1)
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block.add_code Vm::CMachine.instance.mov( reg1 , right: str_addr ) #move arg up
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block.add_code Vm::CMachine.instance.add( str_addr , left: buffer ) # string to write to
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block.add_code Vm::CMachine.instance.add( str_addr , left: str_addr , right: (buffer.length-3)) # string to write to
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context.str_addr = str_addr
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reg1 = Vm::Integer.new(1)
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itos_fun = context.program.get_or_create_function(:utoa)
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block.add_code Vm::CMachine.instance.call( itos_fun , {})
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block.instance_eval do
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mov( reg1 , right: str_addr ) #move arg up
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add( str_addr , left: buffer ) # string to write to
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add( str_addr , left: str_addr , right: (buffer.length-3))
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call( itos_fun , {})
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# And now we "just" have to print it, using the write_stdout
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block.add_code Vm::CMachine.instance.add( str_addr , left: buffer ) # string to write to
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block.add_code Vm::CMachine.instance.mov( reg1 , right: buffer.length )
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add( str_addr , left: buffer ) # string to write to
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mov( reg1 , right: buffer.length )
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end
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ret = Vm::CMachine.instance.write_stdout(block)
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function
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end
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@ -64,11 +66,13 @@ module Core
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remainder = Vm::Integer.new( number.register + 1)
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Vm::CMachine.instance.div10( block , number , remainder )
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# make char out of digit (by using ascii encoding) 48 == "0"
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block.add_code Vm::CMachine.instance.add( remainder , left: remainder , right: 48 )
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block.add_code Vm::CMachine.instance.strb( remainder, right: str_addr )
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block.add_code Vm::CMachine.instance.sub( str_addr, left: str_addr , right: 1 )
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block.add_code Vm::CMachine.instance.cmp( number , right: 0 )
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block.add_code Vm::CMachine.instance.callne( function , {} )
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block.instance_eval do
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add( remainder , left: remainder , right: 48 )
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strb( remainder, right: str_addr )
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sub( str_addr, left: str_addr , right: 1 )
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cmp( number , right: 0 )
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callne( function , {} )
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end
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return function
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end
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end
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