Class: Ragweed::Rasm::Mov

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

Overview

MOV, from reg to mem or v/v, or imm to reg, v/v

Instance Attribute Summary

Attributes inherited from Instruction

#dst, #src

Instance Method Summary collapse

Methods inherited from Instruction

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

Constructor Details

#initialize(x = nil, y = nil) ⇒ Mov

Returns a new instance of Mov.



811
 
# File 'lib/ragweed/rasm/isa.rb', line 811

def initialize( x=nil, y=nil); super x, y; end

Instance Method Details

#to_s ⇒ Object

89 r/m, r 8b r, r/m b8+ r, imm c7+ r/m, imm

Raises:



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# File 'lib/ragweed/rasm/isa.rb', line 778

def to_s
  raise Insuff if not @src or not @dst
  raise NotImp if (src_reg? and @src.index) or (dst_reg? and @dst.index)

  if src_imm?
    if @dst.indir
      add(0xc7)
      add(@dst.code)
      add(@src.val)
    else
      add(0xb8 + @dst.code)
      add(@src.val, true)
    end
  elsif dst_imm?
    raise BadArg, "mov to immed"
  else
    raise(BadArg, "two r/m") if @src.indir and @dst.indir
    if not @src.indir and not @dst.indir
      add(0x89)
      add(modrm(@dst, @src))
    elsif @src.indir # ie, ld
      add(0x8b)
      add(modrm(@dst, @src))
      add(@src.disp)
    elsif @dst.indir # ie, st
      add(0x89)
      add(modrm(@dst, @src))
      add(@dst.disp)
    end
  end
  super
end