Subversion Repositories ao486

/*

 * Copyright (c) 2014, Aleksander Osman

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * * Redistributions of source code must retain the above copyright notice, this

 *   list of conditions and the following disclaimer.

 *

 * * Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

package ao486.test.stack;

import ao486.test.TestUnit;

import static ao486.test.TestUnit.run_test;

import ao486.test.layers.FlagsLayer;

import ao486.test.layers.GeneralRegisterLayer;

import ao486.test.layers.HandleModeChangeLayer;

import ao486.test.layers.IOLayer;

import ao486.test.layers.InstructionLayer;

import ao486.test.layers.Layer;

import ao486.test.layers.MemoryLayer;

import ao486.test.layers.OtherLayer;

import ao486.test.layers.Pair;

import ao486.test.layers.SegmentLayer;

import ao486.test.layers.StackLayer;

import java.io.Serializable;

import java.util.LinkedList;

import java.util.Random;

public class TestPOP_MODREGRM extends TestUnit implements Serializable {

    public static void main(String args[]) throws Exception {

        run_test(TestPOP_MODREGRM.class);

    }

    //--------------------------------------------------------------------------

    @Override

    public int get_test_count() throws Exception {

        return 100;

    }

    @Override

    public void init() throws Exception {

        random = new Random(10 + index);

        long rpl = random.nextInt(4);

        String instruction;

        while(true) {

            layers.clear();

            LinkedList<Pair<Long, Long>> prohibited_list = new LinkedList<>();

            InstructionLayer instr = new InstructionLayer(random, prohibited_list);

            layers.add(instr);

            layers.add(new StackLayer(random, prohibited_list));

            layers.add(new OtherLayer(OtherLayer.Type.RANDOM, random));

            layers.add(new FlagsLayer(FlagsLayer.Type.RANDOM, random));

            layers.add(new GeneralRegisterLayer(random));

            layers.add(new SegmentLayer(random));

            layers.add(new MemoryLayer(random));

            layers.add(new IOLayer(random));

            layers.addFirst(new HandleModeChangeLayer(

                    getInput("cr0_pe"),

                    getInput("vmflag"),

                    rpl, //getInput("cs_rpl"),

                    getInput("cs_p"),

                    getInput("cs_s"),

                    getInput("cs_type")

            ));

            // instruction size

            boolean cs_d_b = getInput("cs_d_b") == 1;

            boolean a32 = random.nextBoolean();

            boolean o32 = random.nextBoolean();

            final Random random_final = random;

            layers.addFirst(new Layer() {

                long ebp() throws Exception {

                    int val = random_final.nextInt();

                    return ((val % 18) == 0)? 0 :

                           ((val % 18) == 1)? 1 :

                           ((val % 18) == 2)? 2 :

                           ((val % 18) == 3)? 3 :

                           ((val % 18) == 4)? 4 :

                           ((val % 18) == 5)? 0xFFFFFFFF :

                           ((val % 18) == 6)? 0x0000FFFF :

                                random_final.nextInt() & ((random_final.nextInt(3) == 0)? 0xFFFFFFFF : 0x00000FFF);

                }

                long esp() throws Exception {

                    int val = random_final.nextInt();

                    return ((val % 18) == 0)? 0 :

                           ((val % 18) == 1)? 1 :

                           ((val % 18) == 2)? 2 :

                           ((val % 18) == 3)? 3 :

                           ((val % 18) == 4)? 4 :

                           ((val % 18) == 5)? 0xFFFFFFFF :

                           ((val % 18) == 6)? 0x0000FFFF :

                                random_final.nextInt() & ((random_final.nextInt(3) == 0)? 0xFFFFFFFF : 0x00000FFF);

                }

            });

            // instruction

            instruction = prepare_instr(cs_d_b, a32, o32, null);

            instruction += instruction;

            instruction += "0F0F";

            // add instruction

            instr.add_instruction(instruction);

            // end condition

            break;

        }

        System.out.println("Instruction: [" + instruction + "]");

    }

    String prepare_instr(boolean cs_d_b, boolean a32, boolean o32, byte modregrm_bytes[]) throws Exception {

        int opcodes[] = {

            0x8F

        };

        String prefix = "";

        if(cs_d_b != o32) { prefix = "66" + prefix; }

        if(cs_d_b != a32) { prefix = "67" + prefix; }

        int     opcode      = opcodes[random.nextInt(opcodes.length)];

        boolean is_modregrm = true;

        byte possible_modregrm = (byte)random.nextInt();

        possible_modregrm &= 0xC7; possible_modregrm |= (0 << 3); // reg in modregrm = 0

        byte possible_sib      = (byte)random.nextInt();

        int len = (is_modregrm == false)? 1 : 1 + modregrm_len(!a32, unsigned(possible_modregrm), unsigned(possible_sib));

        byte instr[] = new byte[len];

        instr[0] = (byte)opcode;

        for(int i=1; i<len; i++) {

            if(i==1)        instr[1] = possible_modregrm;

            else if(i==2)   instr[2] = possible_sib;

            else            instr[i] = (byte)random.nextInt();

        }

        return prefix + bytesToHex(instr);

    }

}