Module: AArch64::Utils

Defined in:
lib/aarch64/utils.rb

Defined Under Namespace

Classes: EncodedMask

Constant Summary collapse

MAX_INT_64 = 
0xFFFFFFFFFFFFFFFF
COND_TABLE = 
{
  "EQ"  => 0b0000,
  "NE"  => 0b0001,
  "CS"  => 0b0010,
  "HS"  => 0b0010,
  "CC"  => 0b0011,
  "LO"  => 0b0011,
  "MI"  => 0b0100,
  "PL"  => 0b0101,
  "VS"  => 0b0110,
  "VC"  => 0b0111,
  "HI"  => 0b1000,
  "LS"  => 0b1001,
  "GE"  => 0b1010,
  "LT"  => 0b1011,
  "GT"  => 0b1100,
  "LE"  => 0b1101,
  "AL"  => 0b1110,
  "NVb" => 0b1111,
}
DC_OP = 
{
  # dc_op          op1,    CRm,    op2
  "IVAC"    => [0b0000, 0b0110, 0b0001],
  "ISW"     => [0b0000, 0b0110, 0b0010],
  "IGVAC"   => [0b0000, 0b0110, 0b0011],
  "IGSW"    => [0b0000, 0b0110, 0b0100],
  "IGDVAC"  => [0b0000, 0b0110, 0b0101],
  "IGDSW"   => [0b0000, 0b0110, 0b0110],
  "CSW"     => [0b0000, 0b1010, 0b0010],
  "CGSW"    => [0b0000, 0b1010, 0b0100],
  "CGDSW"   => [0b0000, 0b1010, 0b0110],
  "CISW"    => [0b0000, 0b1110, 0b0010],
  "CIGSW"   => [0b0000, 0b1110, 0b0100],
  "CIGDSW"  => [0b0000, 0b1110, 0b0110],
  "ZVA"     => [0b0011, 0b0100, 0b0001],
  "GVA"     => [0b0011, 0b0100, 0b0011],
  "GZVA"    => [0b0011, 0b0100, 0b0100],
  "CVAC"    => [0b0011, 0b1010, 0b0001],
  "CGVAC"   => [0b0011, 0b1010, 0b0011],
  "CGDVAC"  => [0b0011, 0b1010, 0b0101],
  "CVAU"    => [0b0011, 0b1011, 0b0001],
  "CVAP"    => [0b0011, 0b1100, 0b0001],
  "CGVAP"   => [0b0011, 0b1100, 0b0011],
  "CGDVAP"  => [0b0011, 0b1100, 0b0101],
  "CVADP"   => [0b0011, 0b1101, 0b0001],
  "CGVADP"  => [0b0011, 0b1101, 0b0011],
  "CGDVADP" => [0b0011, 0b1101, 0b0101],
  "CIVAC"   => [0b0011, 0b1110, 0b0001],
  "CIGVAC"  => [0b0011, 0b1110, 0b0011],
  "CIGDVAC" => [0b0011, 0b1110, 0b0101],
}
DMB_OPTIONS = 
{
  "oshld" => 0b0001,
  "oshst" => 0b0010,
  "osh"   => 0b0011,
  "nshld" => 0b0101,
  "nshst" => 0b0110,
  "nsh"   => 0b0111,
  "ishld" => 0b1001,
  "ishst" => 0b1010,
  "ish"   => 0b1011,
  "ld"    => 0b1101,
  "st"    => 0b1110,
  "sy"    => 0b1111,
}
IC_OPTIONS = 
{
  #               op1,    CRm,  op2
  "ialluis" => [0b000, 0b0001, 0b00],
  "iallu"   => [0b000, 0b0101, 0b00],
  "ivau"    => [0b011, 0b0101, 0b01],
}
TLBI_OPTIONS = 
{
  #                     op1,    CRm,    op2,
  "VMALLE1OS"    => [0b0000, 0b0001, 0b0000],
  "VAE1OS"       => [0b0000, 0b0001, 0b0001],
  "ASIDE1OS"     => [0b0000, 0b0001, 0b0010],
  "VAAE1OS"      => [0b0000, 0b0001, 0b0011],
  "VALE1OS"      => [0b0000, 0b0001, 0b0101],
  "VAALE1OS"     => [0b0000, 0b0001, 0b0111],
  "RVAE1IS"      => [0b0000, 0b0010, 0b0001],
  "RVAAE1IS"     => [0b0000, 0b0010, 0b0011],
  "RVALE1IS"     => [0b0000, 0b0010, 0b0101],
  "RVAALE1IS"    => [0b0000, 0b0010, 0b0111],
  "VMALLE1IS"    => [0b0000, 0b0011, 0b0000],
  "VAE1IS"       => [0b0000, 0b0011, 0b0001],
  "ASIDE1IS"     => [0b0000, 0b0011, 0b0010],
  "VAAE1IS"      => [0b0000, 0b0011, 0b0011],
  "VALE1IS"      => [0b0000, 0b0011, 0b0101],
  "VAALE1IS"     => [0b0000, 0b0011, 0b0111],
  "RVAE1OS"      => [0b0000, 0b0101, 0b0001],
  "RVAAE1OS"     => [0b0000, 0b0101, 0b0011],
  "RVALE1OS"     => [0b0000, 0b0101, 0b0101],
  "RVAALE1OS"    => [0b0000, 0b0101, 0b0111],
  "RVAE1"        => [0b0000, 0b0110, 0b0001],
  "RVAAE1"       => [0b0000, 0b0110, 0b0011],
  "RVALE1"       => [0b0000, 0b0110, 0b0101],
  "RVAALE1"      => [0b0000, 0b0110, 0b0111],
  "VMALLE1"      => [0b0000, 0b0111, 0b0000],
  "VAE1"         => [0b0000, 0b0111, 0b0001],
  "ASIDE1"       => [0b0000, 0b0111, 0b0010],
  "VAAE1"        => [0b0000, 0b0111, 0b0011],
  "VALE1"        => [0b0000, 0b0111, 0b0101],
  "VAALE1"       => [0b0000, 0b0111, 0b0111],
  "IPAS2E1IS"    => [0b0100, 0b0000, 0b0001],
  "RIPAS2E1IS"   => [0b0100, 0b0000, 0b0010],
  "IPAS2LE1IS"   => [0b0100, 0b0000, 0b0101],
  "RIPAS2LE1IS"  => [0b0100, 0b0000, 0b0110],
  "ALLE2OS"      => [0b0100, 0b0001, 0b0000],
  "VAE2OS"       => [0b0100, 0b0001, 0b0001],
  "ALLE1OS"      => [0b0100, 0b0001, 0b0100],
  "VALE2OS"      => [0b0100, 0b0001, 0b0101],
  "VMALLS12E1OS" => [0b0100, 0b0001, 0b0110],
  "RVAE2IS"      => [0b0100, 0b0010, 0b0001],
  "RVALE2IS"     => [0b0100, 0b0010, 0b0101],
  "ALLE2IS"      => [0b0100, 0b0011, 0b0000],
  "VAE2IS"       => [0b0100, 0b0011, 0b0001],
  "ALLE1IS"      => [0b0100, 0b0011, 0b0100],
  "VALE2IS"      => [0b0100, 0b0011, 0b0101],
  "VMALLS12E1IS" => [0b0100, 0b0011, 0b0110],
  "IPAS2E1OS"    => [0b0100, 0b0100, 0b0000],
  "IPAS2E1"      => [0b0100, 0b0100, 0b0001],
  "RIPAS2E1"     => [0b0100, 0b0100, 0b0010],
  "RIPAS2E1OS"   => [0b0100, 0b0100, 0b0011],
  "IPAS2LE1OS"   => [0b0100, 0b0100, 0b0100],
  "IPAS2LE1"     => [0b0100, 0b0100, 0b0101],
  "RIPAS2LE1"    => [0b0100, 0b0100, 0b0110],
  "RIPAS2LE1OS"  => [0b0100, 0b0100, 0b0111],
  "RVAE2OS"      => [0b0100, 0b0101, 0b0001],
  "RVALE2OS"     => [0b0100, 0b0101, 0b0101],
  "RVAE2"        => [0b0100, 0b0110, 0b0001],
  "RVALE2"       => [0b0100, 0b0110, 0b0101],
  "ALLE2"        => [0b0100, 0b0111, 0b0000],
  "VAE2"         => [0b0100, 0b0111, 0b0001],
  "ALLE1"        => [0b0100, 0b0111, 0b0100],
  "VALE2"        => [0b0100, 0b0111, 0b0101],
  "VMALLS12E1"   => [0b0100, 0b0111, 0b0110],
  "ALLE3OS"      => [0b0110, 0b0001, 0b0000],
  "VAE3OS"       => [0b0110, 0b0001, 0b0001],
  "VALE3OS"      => [0b0110, 0b0001, 0b0101],
  "RVAE3IS"      => [0b0110, 0b0010, 0b0001],
  "RVALE3IS"     => [0b0110, 0b0010, 0b0101],
  "ALLE3IS"      => [0b0110, 0b0011, 0b0000],
  "VAE3IS"       => [0b0110, 0b0011, 0b0001],
  "VALE3IS"      => [0b0110, 0b0011, 0b0101],
  "RVAE3OS"      => [0b0110, 0b0101, 0b0001],
  "RVALE3OS"     => [0b0110, 0b0101, 0b0101],
  "RVAE3"        => [0b0110, 0b0110, 0b0001],
  "RVALE3"       => [0b0110, 0b0110, 0b0101],
  "ALLE3"        => [0b0110, 0b0111, 0b0000],
  "VAE3"         => [0b0110, 0b0111, 0b0001],
  "VALE3"        => [0b0110, 0b0111, 0b0101],
}
AT_TABLE = 
{
  :s1e1r  => { :op1 => 0b000, :crm => 0b1000, :op2 => 0b000 },
  :s1e1w  => { :op1 => 0b000, :crm => 0b1000, :op2 => 0b001 },
  :s1e0r  => { :op1 => 0b000, :crm => 0b1000, :op2 => 0b010 },
  :s1e0w  => { :op1 => 0b000, :crm => 0b1000, :op2 => 0b011 },
  :s1e1rp => { :op1 => 0b000, :crm => 0b1001, :op2 => 0b000 },
  :s1e1wp => { :op1 => 0b000, :crm => 0b1001, :op2 => 0b001 },
  :s1e2r  => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b000 },
  :s1e2w  => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b001 },
  :s12e1r => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b100 },
  :s12e1w => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b101 },
  :s12e0r => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b110 },
  :s12e0w => { :op1 => 0b100, :crm => 0b1000, :op2 => 0b111 },
  :s1e3r  => { :op1 => 0b110, :crm => 0b1000, :op2 => 0b000 },
  :s1e3w  => { :op1 => 0b110, :crm => 0b1000, :op2 => 0b001 },
}

Class Method Summary collapse

Class Method Details

.at_op(at_op) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 320

def at_op at_op
  AT_TABLE.fetch at_op
end

.cond2bin(cond) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 30

def cond2bin cond
  COND_TABLE.fetch(cond.to_s.upcase)
end

.count_leading_ones(num) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 69

def count_leading_ones num
  count = 0
  top_bit = 1 << 63
  loop do
    break if num & top_bit != top_bit
    count += 1
    (num <<= 1) & MAX_INT_64
  end
  count
end

.count_trailing_ones(num) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 57

def count_trailing_ones num
  count = 0
  loop do
    break if num & 1 == 0
    count += 1
    num >>= 1
  end

  count
end

.count_trailing_zeros(num) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 45

def count_trailing_zeros num
  count = 0
  loop do
    break if num & 1 == 1
    count += 1
    num >>= 1
  end

  count
end

.dc_op(v) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 151

def dc_op v
  DC_OP.fetch(v.to_s.upcase)
end

.dmb2imm(option) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 171

def dmb2imm option
  DMB_OPTIONS.fetch(option.to_s.downcase)
end

.encode_mask(imm, regsize) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 81

def encode_mask imm, regsize
  size = regsize
  loop do
    size >>= 1
    mask = (1 << size) - 1
    if (imm & mask) != ((imm >> size) & mask)
      size <<= 1
      break
    end

    break unless size > 2
  end

  mask = (-1 & MAX_INT_64) >> (64 - size)
  imm &= mask

  if shifted_mask?(imm)
    i = count_trailing_zeros imm
    cto = count_trailing_ones(imm >> i)
  else
    imm |= ((~mask) & MAX_INT_64)
    unless shifted_mask?((~imm) & MAX_INT_64)
      return nil
    end

    clo = count_leading_ones(imm & MAX_INT_64)
    i = 64 - clo
    cto = clo + count_trailing_ones(imm) - (64 - size)
  end

  immr = (size - i) & (size - 1)
  imms = (~(size - 1) << 1) | (cto - 1)
  n    = ((imms >> 6) & 1) ^ 1

  EncodedMask.new(n, immr & 0x3F, imms & 0x3F)
end

.ic_op(name) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 183

def ic_op name
  IC_OPTIONS.fetch(name.to_s.downcase)
end

.mask?(num) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aarch64/utils.rb', line 35

def mask? num
  ((num + 1) & num) == 0
end

.prfop(sym) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 274

def prfop sym
  if sym.to_s =~ /^(\w{3})(\w\w)(\w{4})$/
    x = case $1
        when "pld" then (0b00 << 3)
        when "pli" then (0b01 << 3)
        when "pst" then (0b10 << 3)
        else
          raise "unknown key #{$1}"
        end
    y = case $2
        when "l1" then (0b00 << 1)
        when "l2" then (0b01 << 1)
        when "l3" then (0b10 << 1)
        else
          raise "unknown key #{$2}"
        end
    z = case $3
        when "keep" then 0b0
        when "strm" then 0b1
        else
          raise "unknown key #{$3}"
        end
    x | y | z
  else
    raise ArgumentError, sym.to_s
  end
end

.shifted_mask?(num) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aarch64/utils.rb', line 40

def shifted_mask? num
  mask?((num - 1) | num)
end

.sub_decode_extend32(extend) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 325

def sub_decode_extend32 extend
  case extend
  when :uxtb then 0b000
  when :uxth then 0b001
  when :uxtw then 0b010
  when :lsl  then 0b010
  when :uxtx then 0b011
  when :sxtb then 0b100
  when :sxth then 0b101
  when :sxtw then 0b110
  when :sxtx then 0b111
  else
    raise "Unknown extend #{extend}"
  end
end

.sub_decode_extend64(extend) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 342

def sub_decode_extend64 extend
  case extend
  when :uxtb then 0b000
  when :uxth then 0b001
  when :uxtw then 0b011
  when :lsl  then 0b011
  when :uxtx then 0b011
  when :sxtb then 0b100
  when :sxth then 0b101
  when :sxtw then 0b110
  when :sxtx then 0b111
  else
    raise "Unknown extend #{extend}"
  end
end

.tlbi_op(name) ⇒ Object 



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# File 'lib/aarch64/utils.rb', line 269

def tlbi_op name
  TLBI_OPTIONS.fetch(name.to_s.upcase)
end