Class: Ragweed::Rasm::Arith

Inherits:
Instruction show all
Defined in:
lib/ragweed/rasm/isa.rb

Overview

Wrapper class for arithmatic instructions. Never called directly; see below.

Direct Known Subclasses

Add, And, Or, Sub, Xor

Instance Attribute Summary

Attributes inherited from Instruction

#dst, #src

Instance Method Summary collapse

Methods inherited from Instruction

#add, #coerce, #dst_imm?, #dst_lab?, #dst_reg?, i, #locate, #modrm, #patch, #sib, #src_imm?, #src_lab?, #src_reg?

Constructor Details

#initialize(dst = nil, src = nil) ⇒ Arith

05 imm32 to eax 04 imm8 to al 80/0 r/m8, imm8 81/0 r/m, imm no sign extend yet 01 r/m, r 03 r, r/m



569
 
# File 'lib/ragweed/rasm/isa.rb', line 569

def initialize( dst=nil, src=nil); super dst, src; end

Instance Method Details

#to_s ⇒ Object 



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# File 'lib/ragweed/rasm/isa.rb', line 571

def to_s
  if not @dst
    # fucked up
    if src_imm?
      if @src.val < 0x100
        add(@imp8)
        add(@src.val)
      else
        add(@imp)
        add(@src.val)
      end
    else
      raise BadArg, "need immed for implicit eax"
    end
  else
    if src_imm?
      if @src.val < 0x100
        add(@imm8)
        add(modrm(@dst, @x))
        add(@src.val)
      else
        add(@imm)
        add(modrm(@dst, @x))
        add(@src.val)
      end
    else
      raise(BadArg, "need two r/m") if not src_reg? or not dst_reg?
      raise(BadArg, "can't both be indir") if @src.indir and @dst.indir
      if @src.indir
        add(@rm)
        add(modrm(@dst, @src))
      else
        add(@mr)
        add(modrm(@dst, @src))
      end
    end
  end
  super
end