89 lines
1.7 KiB
Ruby
89 lines
1.7 KiB
Ruby
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require 'intel/operand'
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module Intel
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##
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# Address is a memory address in one of the following example forms:
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#
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# eax, ebx + ecx, eax + 5, 23545, edx + eax + 2312
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class Address < Operand
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attr_accessor :id, :index
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attr_reader :offset
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attr_writer :isAssemblerOffset # FIX
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def initialize isAssemblerOffset = nil, bits = nil, id = nil
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super(nil,bits)
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self.isAssemblerOffset = isAssemblerOffset
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self.id = id
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self.index = self.offset = nil
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end
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def bits
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super || self.machine.bits
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end
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def offset= obj
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if obj.is_a?(Register) then
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@offset = 0
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self.index = obj
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else
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@offset = obj
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end
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end
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def + o # TODO: this seems totally and completely wrong
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if o.is_a?(Register) then
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self.index = o
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else
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self.offset = o
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end
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self
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end
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def address?
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true
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end
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def offset?
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@isAssemblerOffset.nil? ? id.nil? : @isAssemblerOffset
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end
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def push_mod_rm_on spareRegister, stream
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if id.nil? then
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stream << (0b00000101 + (spareRegister.id << 3))
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return stream.push_D(offset)
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end
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modrm = case offset
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when 0 then
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0b00000000
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when 1..255 then
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0b01000000
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else
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0b10000000
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end
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if index.nil? then
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modrm += (spareRegister.id << 3)
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else
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stream << (0b00000100 + (spareRegister.id << 3))
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modrm += (index.id << 3)
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end
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stream << modrm + id
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return self if offset == 0
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return stream.push_B(offset) if offset < 256
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stream.push_D offset
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end
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def m
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self
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end
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end
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end
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