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bit of evaling

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This commit is contained in:
Torsten Ruger
2014-05-16 23:33:25 +03:00
parent a08661955f
commit 53666e8b33
2 changed files with 34 additions and 26 deletions
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32
lib/arm/arm_machine.rb
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@ -65,9 +65,11 @@ module Arm
# assumes string in r0 and r1 and moves them along for the syscall
def write_stdout block
block.add_code mov( :r2 , right: :r1 )
block.add_code mov( :r1 , right: :r0 )
block.add_code mov( :r0 , right: 1 ) # 1 == stdout
block.instance_eval do
mov( :r2 , right: :r1 )
mov( :r1 , right: :r0 )
mov( :r0 , right: 1 ) # 1 == stdout
end
syscall( block , 4 )
end
@ -79,17 +81,19 @@ module Arm
# Note about division: devision is MUCH more expensive than one would have thought
# And coding it is a bit of a mind leap: it's all about finding a a result that gets the
# remainder smaller than an int. i'll post some links sometime. This is from the arm manual
block.add_code sub( remainder , left: number , right: 10 )
block.add_code sub( number , left: number , right: number , shift_lsr: 2)
block.add_code add( number , left: number , right: number , shift_lsr: 4)
block.add_code add( number , left: number , right: number , shift_lsr: 8)
block.add_code add( number , left: number , right: number , shift_lsr: 16)
block.add_code mov( number , right: number , shift_lsr: 3)
tmp = Vm::Integer.new( remainder.register + 1)
block.add_code add( tmp , left: number , right: number , shift_lsl: 2)
block.add_code sub( remainder , left: remainder , right: tmp , shift_lsl: 1 , update_status: 1)
block.add_code add( number , left: number, right: 1 , condition_code: :pl )
block.add_code add( remainder , left: remainder , right: 10 , condition_code: :mi )
block.instance_eval do
sub( remainder , left: number , right: 10 )
sub( number , left: number , right: number , shift_lsr: 2)
add( number , left: number , right: number , shift_lsr: 4)
add( number , left: number , right: number , shift_lsr: 8)
add( number , left: number , right: number , shift_lsr: 16)
mov( number , right: number , shift_lsr: 3)
tmp = Vm::Integer.new( remainder.register + 1)
add( tmp , left: number , right: number , shift_lsl: 2)
sub( remainder , left: remainder , right: tmp , shift_lsl: 1 , update_status: 1)
add( number , left: number, right: 1 , condition_code: :pl )
add( remainder , left: remainder , right: 10 , condition_code: :mi )
end
end
def syscall block , num