Class: SeccompTools::Instruction::ALU

Inherits:
Base
  • Object
show all
Defined in:
lib/seccomp-tools/instruction/alu.rb

Overview

Instruction alu.

Constant Summary collapse

OP_SYM =

Mapping from name to operator.

{
  add: :+,
  sub: :-,
  mul: :*,
  div: :/,
  or: :|,
  and: :&,
  lsh: :<<,
  rsh: :>>,
  # neg: :-, # should not be invoked
  # mod: :%, # unsupported
  xor: :^
}.freeze

Constants included from Const::BPF

Const::BPF::ACTION, Const::BPF::COMMAND, Const::BPF::JMP, Const::BPF::MISCOP, Const::BPF::MODE, Const::BPF::OP, Const::BPF::PR_SET_SECCOMP, Const::BPF::SECCOMP_MODE_FILTER, Const::BPF::SECCOMP_RET_ACTION_FULL, Const::BPF::SECCOMP_RET_DATA, Const::BPF::SECCOMP_SET_MODE_FILTER, Const::BPF::SIZEOF_SECCOMP_DATA, Const::BPF::SRC

Instance Method Summary collapse

Methods inherited from Base

#initialize, #invalid

Constructor Details

This class inherits a constructor from SeccompTools::Instruction::Base

Instance Method Details

#branch(context) ⇒ Array<(Integer, Context)>

See Base#branch.

Parameters:

  • context (Context) —

    Current context.

Returns:

  • (Array<(Integer, Context)>) 


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# File 'lib/seccomp-tools/instruction/alu.rb', line 42

def branch(context)
  ctx = context.dup
  ctx[:a] = Disasm::Context::Value.new
  [[line + 1, ctx]]
end

#decompile ⇒ Object

Decompile instruction.



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# File 'lib/seccomp-tools/instruction/alu.rb', line 24

def decompile
  return 'A = -A' if op == :neg

  "A #{op_sym}= #{src_str}"
end

#symbolize ⇒ [:alu, Symbol, (:x, Integer, nil)]

See Base#symbolize.

Returns:

  • ([:alu, Symbol, (:x, Integer, nil)]) 


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# File 'lib/seccomp-tools/instruction/alu.rb', line 32

def symbolize
  return [:alu, :neg, nil] if op == :neg

  [:alu, op_sym, src]
end