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.segment;

import ao486.test.TestUnit;

import static ao486.test.TestUnit.run_test;

import ao486.test.layers.DescriptorTableLayer;

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.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 TestVERR extends TestUnit implements Serializable {

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

        run_test(TestVERR.class);

    }

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

    @Override

    public int get_test_count() throws Exception {

        return 100;

    }

    @Override

    public void init() throws Exception {

        random = new Random(74 + index);

        /* 0. not protected mode

         * 1. zero selector

         * 2. fetch descriptor failed:

         *      - index over limit (GDT,LDT)

         *      - LDT not valid

         * 3. descriptor check failed:

         *      - descriptor type not valid, privilege not valid,

         * 4. all ok

         */

        int type = random.nextInt(4+1);

        String instruction;

        while(true) {

            layers.clear();

            long    next_cs_rpl;

            boolean descr_seg;

            int     descr_type;

            int     descr_dpl;

            boolean descr_present;

            long    selector_rpl;

            int cond = (type == 4)? 0 : 1 << (random.nextInt(100000) % 4);

            System.out.printf("cond: %d, index: %d\n", cond, index);

            boolean verr_cond_1;

            boolean verr_cond_2;

            boolean verr_cond_3;

            boolean verr_cond_4;

            do {

                next_cs_rpl     = random.nextInt(4);

                descr_seg       = random.nextBoolean();

                descr_type      = random.nextInt(16);

                descr_dpl       = random.nextInt(4);

                descr_present   = random.nextBoolean();

                selector_rpl    = random.nextInt(4);

                verr_cond_1 = !descr_seg;

                verr_cond_2 = descr_seg && ((descr_type >> 3)&1) == 1 && ((descr_type >> 1)&1) == 0; //code && not readable

                verr_cond_3 = descr_seg && ((descr_type >> 3)&1) == 1 && ((descr_type >> 1)&1) == 1 && ((descr_type >> 2)&1) == 0 &&

                                (descr_dpl < next_cs_rpl || descr_dpl < selector_rpl); //code && readable && not conforming

                verr_cond_4 = descr_seg && ((descr_type >> 3)&1) == 0 && (descr_dpl < next_cs_rpl || descr_dpl < selector_rpl); //data       

            }

            while(!isAccepted(cond, verr_cond_1,verr_cond_2,verr_cond_3,verr_cond_4));

            //0-real; 1-v8086; 2-protected

            int mode = (type == 0)? random.nextInt(2) : 2;

            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((mode >= 1)? OtherLayer.Type.PROTECTED_OR_V8086 : OtherLayer.Type.REAL, random));

            layers.add(new FlagsLayer((mode == 1)? FlagsLayer.Type.V8086 : (mode == 2)? FlagsLayer.Type.NOT_V8086 : 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"),

                    next_cs_rpl, //getInput("cs_rpl"),

                    getInput("cs_p"),

                    getInput("cs_s"),

                    getInput("cs_type")

            ));

            // instruction size

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

            long    cs_rpl = getInput("cs_rpl");

            boolean a32 = random.nextBoolean();

            boolean o32 = random.nextBoolean();

            long selector = 0;

            if(type == 1) {

                selector = random.nextInt(4);

            }

            else if(type == 2) {

                boolean ldtr_valid = random.nextInt(5) != 0;

                DescriptorTableLayer tables = new DescriptorTableLayer(random, prohibited_list, ldtr_valid);

                boolean is_ldt = random.nextBoolean();

                int index = tables.getOutOfBoundsIndex(is_ldt);

                if(index == -1) continue;

                if(ldtr_valid == false && is_ldt) index = 0;

                index = index << 3;

                if(is_ldt) index |= 4;

                index |= random.nextInt(4);

                selector = index;

                layers.addFirst(tables);

            }

            else if(type >= 3) {

                TestUnit.Descriptor desc = new TestUnit.Descriptor(

                        random.nextInt(), //base

                        random.nextInt() & 0xFFFFF, //limit

                        descr_type,

                        descr_seg,

                        descr_present,

                        descr_dpl,

                        random.nextBoolean(), //d_b

                        random.nextBoolean(), //g

                        random.nextBoolean(), //l

                        random.nextBoolean()  //avl

                );

                DescriptorTableLayer tables = new DescriptorTableLayer(random, prohibited_list, true);

                boolean is_ldt = random.nextBoolean();

                int index = tables.addDescriptor(is_ldt, desc);

                if(index == -1) continue;

                index = index << 3;

                if(is_ldt) index |= 4;

                index |= selector_rpl;

                selector = index;

                layers.addFirst(tables);

            }

            byte extra_bytes[] = null;

            byte modregrm_bytes[] = EffectiveAddressLayerFactory.prepare(

                    selector,

                    4, EffectiveAddressLayerFactory.modregrm_reg_t.SET,

                    2, a32,

                    layers, random, this, false, false);

            extra_bytes = modregrm_bytes;

            // instruction

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

            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[] = {

            0x00

        };

        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)];

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

        instr[0] = (byte)opcode;

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

        return prefix + "0F" + bytesToHex(instr);

    }

}