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.DescriptorTableLayer;

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 ao486.test.layers.TSSCurrentLayer;

import java.io.*;

import java.util.LinkedList;

import java.util.Random;

public class TestIRET_task_switch extends TestUnit implements Serializable {

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

        run_test(TestIRET_task_switch.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<>();

            InstructionLayer instr  = new InstructionLayer(random, prohibited_list);

            layers.add(instr);

            StackLayer stack        = new StackLayer(random, prohibited_list);

            layers.add(stack);

            layers.add(new OtherLayer(OtherLayer.Type.PROTECTED_OR_V8086, random));

            layers.add(new FlagsLayer(FlagsLayer.Type.NOT_V8086_NT, 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")

            ));

            // instruction size

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

            boolean a32 = random.nextBoolean();

            boolean o32 = random.nextBoolean();

            /* 0 - link tss selector with TI set

             * 1 - TSS descriptor out of bounds

             * 2 - invalid TSS descriptor

             *

             * >=3 - task switch tests

             */

            int type = random.nextInt(4);

            int task_switch_type = -1;

            DescriptorTableLayer tables = null;

            int new_tss_selector = -1;

            int old_tss_limit = 0xFFFF;

            TSSCurrentLayer.Type old_tss_type = random.nextBoolean()? TSSCurrentLayer.Type.BUSY_286 : TSSCurrentLayer.Type.BUSY_386;

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

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

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

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

            if(type == 0) {

                new_tss_selector = random.nextInt(65536);

                new_tss_selector |= 4;

                TSSCurrentLayer current_tss = new TSSCurrentLayer(random, old_tss_type, 0xFFFF, new_tss_selector, prohibited_list);

                layers.addFirst(current_tss);

            }

            else if(type == 1) {

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

                new_tss_selector = tables.getOutOfBoundsIndex(false);

                if(new_tss_selector == -1) continue;

                new_tss_selector <<= 3;

                new_tss_selector |= random.nextInt(0x8);

            }

            else if(type == 2) {

                boolean conds[] = new boolean[3];

                int cond = 1 << random.nextInt(conds.length);

                boolean new_tss_seg  = false;

                int     new_tss_type = 0;

                boolean new_tss_p    = false;

                int     new_tss_dpl  = random.nextInt(4);

                boolean new_tss_d_b  = random.nextBoolean();

                boolean new_tss_l    = random.nextBoolean();

                boolean new_tss_avl  = random.nextBoolean();

                int     new_tss_rpl  = random.nextInt(4);

                do {

                    new_tss_seg = random.nextBoolean();

                    new_tss_type= random.nextInt(16);

                    new_tss_p   = random.nextBoolean();

                    conds[0] = new_tss_seg;

                    conds[1] = new_tss_type != 0x3 && new_tss_type != 0xb;

                    conds[2] = new_tss_p == false;

                }

                while(!isAccepted(cond, conds[0],conds[1],conds[2]));

                //---------

                long new_tss_base, new_tss_limit;

                boolean new_tss_g;

                while(true) {

                    new_tss_base = Layer.norm(random.nextInt());

                    new_tss_g    = random.nextBoolean();

                    new_tss_limit = random.nextInt(new_tss_g? 0xF+1 : 0xFFFF + 1);

                    if(new_tss_g) new_tss_limit = (new_tss_limit << 12) | 0xFFF;

                    if( new_tss_base + new_tss_limit < 4294967296L &&

                        Layer.collides(prohibited_list, (int)new_tss_base, (int)(new_tss_base + new_tss_limit)) == false )

                    {

                        prohibited_list.add(new Pair<>(new_tss_base, new_tss_base + new_tss_limit));

                        break;

                    }

                }

                long new_tss_limit_final = new_tss_g? new_tss_limit >> 12 : new_tss_limit;

                Descriptor tss_desc = new Descriptor((int)new_tss_base, (int)new_tss_limit_final, new_tss_type, new_tss_seg, new_tss_p, new_tss_dpl, new_tss_d_b, new_tss_g, new_tss_l, new_tss_avl);

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

                new_tss_selector = tables.addDescriptor(false, tss_desc);

                if(new_tss_selector == -1) continue;

                //copy

                new_tss_selector <<= 3;

                new_tss_selector |= new_tss_rpl;

            }

            else if(type >= 3) {

                boolean conds[] = new boolean[3];

                int cond = 0;

                boolean new_tss_seg  = false;

                int     new_tss_type = 0;

                boolean new_tss_p    = false;

                int     new_tss_dpl  = random.nextInt(4);

                boolean new_tss_d_b  = random.nextBoolean();

                boolean new_tss_l    = random.nextBoolean();

                boolean new_tss_avl  = random.nextBoolean();

                int     new_tss_rpl  = random.nextInt(4);

                do {

                    new_tss_seg = random.nextBoolean();

                    new_tss_type= (type == 8 || type == 9)? 0xB : random.nextInt(16);

                    new_tss_p   = random.nextBoolean();

                    conds[0] = new_tss_seg;

                    conds[1] = new_tss_type != 0x3 && new_tss_type != 0xb;

                    conds[2] = new_tss_p == false;

                }

                while(!isAccepted(cond, conds[0],conds[1],conds[2]));

                //---------

                long new_tss_base, new_tss_limit;

                boolean new_tss_g;

                while(true) {

                    new_tss_base = Layer.norm(random.nextInt());

                    new_tss_g    = random.nextBoolean();

                    new_tss_limit = random.nextInt(new_tss_g? 0xF+1 : 0xFFFF + 1);

                    if(new_tss_g) new_tss_limit = (new_tss_limit << 12) | 0xFFF;

                    if( new_tss_base + new_tss_limit < 4294967296L &&

                        Layer.collides(prohibited_list, (int)new_tss_base, (int)(new_tss_base + new_tss_limit)) == false)

                    {

                        prohibited_list.add(new Pair<>(new_tss_base, new_tss_base + new_tss_limit));

                        break;

                    }

                }

                long new_tss_limit_final = new_tss_g? new_tss_limit >> 12 : new_tss_limit;

                Descriptor tss_desc = new Descriptor((int)new_tss_base, (int)new_tss_limit_final, new_tss_type, new_tss_seg, new_tss_p, new_tss_dpl, new_tss_d_b, new_tss_g, new_tss_l, new_tss_avl);

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

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

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

                boolean is_ok = TestTaskSwitch.test(random, this, prohibited_list, TestTaskSwitch.Source.FROM_IRET, tss_desc, new_tss_rpl, null, task_switch_type);

                if(is_ok == false) continue;

                tables              = TestTaskSwitch.tables;

                new_tss_selector    = TestTaskSwitch.new_tss_selector;

                old_tss_limit       = TestTaskSwitch.old_tss_limit;

            }

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

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

            if(type != 0) {

                TSSCurrentLayer old_tss = new TSSCurrentLayer(random, old_tss_type, old_tss_limit, new_tss_selector, prohibited_list);

                layers.addFirst(old_tss);

                layers.addFirst(tables);

            }

            // add instruction

            instruction = prepare_instr(cs_d_b, a32, o32);

            instr.add_instruction(instruction);

            // end condition

            break;

        }

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

    }

    int imm_len(boolean a32, boolean o32, int opcode) {

        return 0;

    }

    String prepare_instr(boolean cs_d_b, boolean a32, boolean o32) throws Exception {

        int opcodes[] = {

            0xCF

        };

        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 = false;

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

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

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

        len += imm_len(a32, o32, opcode);

        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);

    }

}