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.branch;

import ao486.test.TestUnit;

import ao486.test.layers.EffectiveAddressLayerFactory;

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.MemoryPatchLayer;

import ao486.test.layers.OtherLayer;

import ao486.test.layers.Pair;

import ao486.test.layers.SegmentLayer;

import ao486.test.layers.StackLayer;

import java.io.*;

import java.util.LinkedList;

import java.util.Random;

public class TestJMP_real_v8086 extends TestUnit implements Serializable {

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

        run_test(TestJMP_real_v8086.class);

    }

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

    @Override

    public int get_test_count() throws Exception {

        return 100;

    }

    @Override

    public void init() throws Exception {

        random = new Random(3 + index);

        String instruction;

        while(true) {

            layers.clear();

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

            // if false: v8086 mode

            boolean is_real = random.nextBoolean();

            InstructionLayer instr  = new InstructionLayer(random, prohibited_list);

            layers.add(instr);

            StackLayer stack        = new StackLayer(random, prohibited_list);

            layers.add(stack);

            layers.add(new OtherLayer(is_real ? OtherLayer.Type.REAL : OtherLayer.Type.PROTECTED_OR_V8086, random));

            layers.add(new FlagsLayer(is_real ? FlagsLayer.Type.RANDOM : FlagsLayer.Type.V8086, 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"),

                    getInput("cs_rpl"),

                    getInput("cs_p"),

                    getInput("cs_s"),

                    getInput("cs_type")

            ));

            /*

             * 0 - eip out of bounds

             *

             * 1 - all ok

             */

            int type = random.nextInt(2);

            // instruction size

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

            boolean a32 = random.nextBoolean();

            boolean o32 = random.nextBoolean();

            // destination

            long cs         = random.nextInt(0xFFFF+1);

            long cs_limit   = (is_real == false)? 0xFFFF : getInput("cs_limit");

            long new_eip    = random.nextInt((int)cs_limit+1);

            if(o32 == false) new_eip &= 0xFFFF;

            if(type == 0 && o32 == false && cs_limit <= 0xFFFF) new_eip = 0xFFFF - 4 + random.nextInt(5);

            if(type == 0 && o32 == true)                        new_eip = cs_limit + random.nextInt(5);

            // dest instruction

            long dest = (cs << 4) + new_eip;

            boolean can_add = Layer.collides(prohibited_list, (int)dest, (int)(dest+1));

            if(can_add == false) continue;

            MemoryPatchLayer patch = new MemoryPatchLayer(random, prohibited_list, (int)dest, 0x0F,0x0F);

            layers.addFirst(patch);

            // add instruction

            byte extra_bytes[] = null;

            boolean is_Ep = random.nextBoolean();

            if(is_Ep) {

                byte modregrm_bytes[] = EffectiveAddressLayerFactory.prepare(

                        o32? (((cs & 0xFFFF) << 32) | (new_eip & 0xFFFFFFFF)) : (((cs & 0xFFFF) << 16) | (new_eip & 0xFFFF)),

                        5, EffectiveAddressLayerFactory.modregrm_reg_t.SET,

                        o32? 6 : 4, a32,

                        layers, random, this, true, false);

                extra_bytes = modregrm_bytes;

            }

            else {

                long immediate = o32? (((cs & 0xFFFF) << 32) | (new_eip & 0xFFFFFFFF)) : (((cs & 0xFFFF) << 16) | (new_eip & 0xFFFF));

                byte imm_bytes[] = new byte[o32? 6 : 4];

                for(int i=0; i<imm_bytes.length; i++) {

                    imm_bytes[i] = (byte)(immediate & 0xFF);

                    immediate >>= 8;

                }

                extra_bytes = imm_bytes;

            }

            instruction = prepare_instr(cs_d_b, a32, o32, extra_bytes, is_Ep);

            instr.add_instruction(instruction);

System.out.printf("a32: %b, o32: %b, cs_d_b: %b\n", a32,o32,cs_d_b);

System.out.printf("cs: %x\n", cs);

System.out.printf("cs_limit: %x\n", cs_limit);

System.out.printf("new_eip: %x\n", new_eip);

System.out.printf("o32: %b\n", o32);

System.out.printf("is_real: %b\n", is_real);

            // end condition

            break;

        }

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

    }

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

        int opcodes[] = {

            0xFF, 0xEA

        };

        String prefix = "";

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

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

        int opcode = opcodes[is_Ep? 0 : 1];

        byte instr[] = new byte[1 + extra_bytes.length];

        instr[0] = (byte)opcode;

        System.arraycopy(extra_bytes, 0, instr, 1, extra_bytes.length);

        return prefix + bytesToHex(instr);

    }

}