Module: YTLJit::AssemblerUtilX64

Defined in:
lib/ytljit/instruction_x64.rb

Instance Method Summary collapse

Instance Method Details

#immidiate_call(addr, offset) ⇒ Object 



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# File 'lib/ytljit/instruction_x64.rb', line 42

def immidiate_call(addr, offset)
  if offset.abs > 0x7fff_ffff then
    addrent = @asm.add_value_entry(addr)
    offset = addrent.value - @asm.current_address - 7
    modseq, modfmt = modrm(:call, 2, offset, nil, addr)
    [0x48, 0xff, *modseq, offset].pack("CC#{modfmt}L")
  else
    [0xe8, offset].pack("CL")
  end
end

#rex(dst, src) ⇒ Object 



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# File 'lib/ytljit/instruction_x64.rb', line 3

def rex(dst, src)
  rrex = 0
  if dst.is_a?(OpReg64) then
    rrex |= 0b1000
    if dst.reg_no >= 8 then
      rrex |= 0b1
    end
  end
  
  if dst.is_a?(OpIndirect) and dst.reg.is_a?(OpReg64) then
    if dst.reg_no >= 8 then
      rrex |= 0b1
    end
  end
  
  if src.is_a?(OpReg64) then
    rrex |= 0b1000
    if src.reg_no >= 8 then
      rrex |= 0b100
    end
  end

  if src.is_a?(OpIndirect) and src.reg.is_a?(OpReg64) then
    if src.reg_no >= 8 then
      rrex |= 0b1
    end
  end

  if src.is_a?(OpImmidiate64) then
    rrex |= 0b1000
  end

  if rrex != 0 then
    [[0x40 + rrex], "C"]
  else
    [[], ""]
  end
end