/*BEGIN_LEGAL 
Intel Open Source License 

Copyright (c) 2002-2014 Intel Corporation. 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.  Neither the name of
the Intel Corporation nor the names of its contributors may be used to
endorse or promote products derived from this software without
specific prior written permission.
 
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
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ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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END_LEGAL */
/*
 * This tool tests the API PIN_AddDebuggerRegisterEmulator(), which allows
 * a tool to provide emulated registers to GDB when using application-level debugging.
 * The tool doesn't do any useful emulation because all registers have the identity
 * emulation (e.g. the tool emulates REG_RCX by providing the value of REG_RCX).
 * However, this does demonstrate the usage of the API.
 */

#include <cstring>
#include <iostream>
#include "pin.H"

//
// These registers are "emulated" by the tool.
//
enum EMULATED_REG
{
    EMULATED_REG_RCX,
    EMULATED_REG_RSP,
    EMULATED_REG_ST0,
    EMULATED_REG_FPSW,
    EMULATED_REG_XMM0
};

// This describes the full set of registers that Pin provides to GDB.
// The order and size of each register must match the XML documents
// below.  Entries with REG_NONE are emulated by the tool.  Pin
// provides the values for the other registers.
//
DEBUGGER_REG_DESCRIPTION RegDescs[] =
{
    {REG_RAX, 0, 64},
    {REG_RBX, 0, 64},
    {REG_NONE, EMULATED_REG_RCX, 64},
    {REG_RDX, 0, 64},
    {REG_RSI, 0, 64},
    {REG_RDI, 0, 64},
    {REG_RBP, 0, 64},
    {REG_NONE, EMULATED_REG_RSP, 64},
    {REG_R8, 0, 64},
    {REG_R9, 0, 64},
    {REG_R10, 0, 64},
    {REG_R11, 0, 64},
    {REG_R12, 0, 64},
    {REG_R13, 0, 64},
    {REG_R14, 0, 64},
    {REG_R15, 0, 64},
    {REG_INST_PTR, 0, 64},
    {REG_RFLAGS, 0, 32},
    {REG_SEG_CS, 0, 32},
    {REG_SEG_SS, 0, 32},
    {REG_SEG_DS, 0, 32},
    {REG_SEG_ES, 0, 32},
    {REG_SEG_FS, 0, 32},
    {REG_SEG_GS, 0, 32},
    {REG_NONE, EMULATED_REG_ST0, 80},
    {REG_ST1, 0, 80},
    {REG_ST2, 0, 80},
    {REG_ST3, 0, 80},
    {REG_ST4, 0, 80},
    {REG_ST5, 0, 80},
    {REG_ST6, 0, 80},
    {REG_ST7, 0, 80},
    {REG_FPCW, 0, 32},
    {REG_NONE, EMULATED_REG_FPSW, 32},
    {REG_FPTAG_FULL, 0, 32},
    {REG_FPIP_SEL, 0, 32},
    {REG_FPIP_OFF, 0, 32},
    {REG_FPDP_SEL, 0, 32},
    {REG_FPDP_OFF, 0, 32},
    {REG_FPOPCODE, 0, 32},
    {REG_NONE, EMULATED_REG_XMM0, 128},
    {REG_XMM1, 0, 128},
    {REG_XMM2, 0, 128},
    {REG_XMM3, 0, 128},
    {REG_XMM4, 0, 128},
    {REG_XMM5, 0, 128},
    {REG_XMM6, 0, 128},
    {REG_XMM7, 0, 128},
    {REG_XMM8, 0, 128},
    {REG_XMM9, 0, 128},
    {REG_XMM10, 0, 128},
    {REG_XMM11, 0, 128},
    {REG_XMM12, 0, 128},
    {REG_XMM13, 0, 128},
    {REG_XMM14, 0, 128},
    {REG_XMM15, 0, 128},
    {REG_MXCSR, 0, 32},
    {REG_ORIG_RAX, 0, 64}
};

unsigned NumRegs = sizeof(RegDescs) / sizeof(RegDescs[0]);


// These XML documents describe the registers to GDB.  See the GDB
// Manual appendix titled "Target Descriptions" for more information.
//
const char FeatureDocumentTop[] =
    "<?xml version=\"1.0\"?>\n"
    "<!-- Copyright (C) 2010 Free Software Foundation, Inc.\n"
    "\n"
    "     Copying and distribution of this file, with or without modification,\n"
    "     are permitted in any medium without royalty provided the copyright\n"
    "     notice and this notice are preserved.  -->\n"
    "\n"
    "<!-- x86-64 - Includes Linux-only special \"register\".  -->\n"
    "\n"
    "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
    "<target>\n"
    "  <architecture>i386:x86-64</architecture>\n"
    "  <osabi>GNU/Linux</osabi>\n"
    "  <xi:include href=\"64bit-core.xml\"/>\n"
    "  <xi:include href=\"64bit-sse.xml\"/>\n"
    "  <xi:include href=\"64bit-linux.xml\"/>\n"
    "</target>\n";

const char FeatureDocumentCore[] =
    "<?xml version=\"1.0\"?>\n"
    "<!-- Copyright (C) 2010 Free Software Foundation, Inc.\n"
    "\n"
    "     Copying and distribution of this file, with or without modification,\n"
    "     are permitted in any medium without royalty provided the copyright\n"
    "     notice and this notice are preserved.  -->\n"
    "\n"
    "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">\n"
    "<feature name=\"org.gnu.gdb.i386.core\">\n"
    "  <flags id=\"i386_eflags\" size=\"4\">\n"
    "    <field name=\"CF\" start=\"0\" end=\"0\"/>\n"
    "    <field name=\"\" start=\"1\" end=\"1\"/>\n"
    "    <field name=\"PF\" start=\"2\" end=\"2\"/>\n"
    "    <field name=\"AF\" start=\"4\" end=\"4\"/>\n"
    "    <field name=\"ZF\" start=\"6\" end=\"6\"/>\n"
    "    <field name=\"SF\" start=\"7\" end=\"7\"/>\n"
    "    <field name=\"TF\" start=\"8\" end=\"8\"/>\n"
    "    <field name=\"IF\" start=\"9\" end=\"9\"/>\n"
    "    <field name=\"DF\" start=\"10\" end=\"10\"/>\n"
    "    <field name=\"OF\" start=\"11\" end=\"11\"/>\n"
    "    <field name=\"NT\" start=\"14\" end=\"14\"/>\n"
    "    <field name=\"RF\" start=\"16\" end=\"16\"/>\n"
    "    <field name=\"VM\" start=\"17\" end=\"17\"/>\n"
    "    <field name=\"AC\" start=\"18\" end=\"18\"/>\n"
    "    <field name=\"VIF\" start=\"19\" end=\"19\"/>\n"
    "    <field name=\"VIP\" start=\"20\" end=\"20\"/>\n"
    "    <field name=\"ID\" start=\"21\" end=\"21\"/>\n"
    "  </flags>\n"
    "\n"
    "  <reg name=\"rax\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rbx\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rcx\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rdx\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rsi\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rdi\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"rbp\" bitsize=\"64\" type=\"data_ptr\"/>\n"
    "  <reg name=\"rsp\" bitsize=\"64\" type=\"data_ptr\"/>\n"
    "  <reg name=\"r8\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r9\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r10\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r11\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r12\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r13\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r14\" bitsize=\"64\" type=\"int64\"/>\n"
    "  <reg name=\"r15\" bitsize=\"64\" type=\"int64\"/>\n"
    "\n"
    "  <reg name=\"rip\" bitsize=\"64\" type=\"code_ptr\"/>\n"
    "  <reg name=\"eflags\" bitsize=\"32\" type=\"i386_eflags\"/>\n"
    "  <reg name=\"cs\" bitsize=\"32\" type=\"int32\"/>\n"
    "  <reg name=\"ss\" bitsize=\"32\" type=\"int32\"/>\n"
    "  <reg name=\"ds\" bitsize=\"32\" type=\"int32\"/>\n"
    "  <reg name=\"es\" bitsize=\"32\" type=\"int32\"/>\n"
    "  <reg name=\"fs\" bitsize=\"32\" type=\"int32\"/>\n"
    "  <reg name=\"gs\" bitsize=\"32\" type=\"int32\"/>\n"
    "\n"
    "  <reg name=\"st0\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st1\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st2\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st3\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st4\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st5\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st6\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "  <reg name=\"st7\" bitsize=\"80\" type=\"i387_ext\"/>\n"
    "\n"
    "  <reg name=\"fctrl\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"fstat\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"ftag\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"fiseg\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"fioff\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"foseg\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"fooff\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "  <reg name=\"fop\" bitsize=\"32\" type=\"int\" group=\"float\"/>\n"
    "</feature>\n";

const char FeatureDocumentLinux[] =
    "<?xml version=\"1.0\"?>\n"
    "<!-- Copyright (C) 2010 Free Software Foundation, Inc.\n"
    "\n"
    "     Copying and distribution of this file, with or without modification,\n"
    "     are permitted in any medium without royalty provided the copyright\n"
    "     notice and this notice are preserved.  -->\n"
    "\n"
    "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">\n"
    "<feature name=\"org.gnu.gdb.i386.linux\">\n"
    "  <reg name=\"orig_rax\" bitsize=\"64\" type=\"int\" regnum=\"57\"/>\n"
    "</feature>\n";

const char FeatureDocumentSSE[] =
    "<?xml version=\"1.0\"?>\n"
    "<!-- Copyright (C) 2010 Free Software Foundation, Inc.\n"
    "\n"
    "     Copying and distribution of this file, with or without modification,\n"
    "     are permitted in any medium without royalty provided the copyright\n"
    "     notice and this notice are preserved.  -->\n"
    "\n"
    "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">\n"
    "<feature name=\"org.gnu.gdb.i386.sse\">\n"
    "  <vector id=\"v4f\" type=\"ieee_single\" count=\"4\"/>\n"
    "  <vector id=\"v2d\" type=\"ieee_double\" count=\"2\"/>\n"
    "  <vector id=\"v16i8\" type=\"int8\" count=\"16\"/>\n"
    "  <vector id=\"v8i16\" type=\"int16\" count=\"8\"/>\n"
    "  <vector id=\"v4i32\" type=\"int32\" count=\"4\"/>\n"
    "  <vector id=\"v2i64\" type=\"int64\" count=\"2\"/>\n"
    "  <union id=\"vec128\">\n"
    "    <field name=\"v4_float\" type=\"v4f\"/>\n"
    "    <field name=\"v2_double\" type=\"v2d\"/>\n"
    "    <field name=\"v16_int8\" type=\"v16i8\"/>\n"
    "    <field name=\"v8_int16\" type=\"v8i16\"/>\n"
    "    <field name=\"v4_int32\" type=\"v4i32\"/>\n"
    "    <field name=\"v2_int64\" type=\"v2i64\"/>\n"
    "    <field name=\"uint128\" type=\"uint128\"/>\n"
    "  </union>\n"
    "  <flags id=\"i386_mxcsr\" size=\"4\">\n"
    "    <field name=\"IE\" start=\"0\" end=\"0\"/>\n"
    "    <field name=\"DE\" start=\"1\" end=\"1\"/>\n"
    "    <field name=\"ZE\" start=\"2\" end=\"2\"/>\n"
    "    <field name=\"OE\" start=\"3\" end=\"3\"/>\n"
    "    <field name=\"UE\" start=\"4\" end=\"4\"/>\n"
    "    <field name=\"PE\" start=\"5\" end=\"5\"/>\n"
    "    <field name=\"DAZ\" start=\"6\" end=\"6\"/>\n"
    "    <field name=\"IM\" start=\"7\" end=\"7\"/>\n"
    "    <field name=\"DM\" start=\"8\" end=\"8\"/>\n"
    "    <field name=\"ZM\" start=\"9\" end=\"9\"/>\n"
    "    <field name=\"OM\" start=\"10\" end=\"10\"/>\n"
    "    <field name=\"UM\" start=\"11\" end=\"11\"/>\n"
    "    <field name=\"PM\" start=\"12\" end=\"12\"/>\n"
    "    <field name=\"FZ\" start=\"15\" end=\"15\"/>\n"
    "  </flags>\n"
    "\n"
    "  <reg name=\"xmm0\" bitsize=\"128\" type=\"vec128\" regnum=\"40\"/>\n"
    "  <reg name=\"xmm1\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm2\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm3\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm4\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm5\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm6\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm7\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm8\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm9\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm10\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm11\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm12\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm13\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm14\" bitsize=\"128\" type=\"vec128\"/>\n"
    "  <reg name=\"xmm15\" bitsize=\"128\" type=\"vec128\"/>\n"
    "\n"
    "  <reg name=\"mxcsr\" bitsize=\"32\" type=\"i386_mxcsr\" group=\"vector\"/>\n"
    "</feature>\n";


static VOID GetReg(unsigned, THREADID, CONTEXT *, VOID *, VOID *);
static VOID SetReg(unsigned, THREADID, CONTEXT *, const VOID *, VOID *);
static USIZE GetDoc(const std::string &, USIZE, void *, VOID *);
static void PrintEmulated();



int main(int argc, char * argv[])
{
    PIN_Init(argc, argv);

    PIN_AddDebuggerRegisterEmulator(NumRegs, RegDescs, GetReg, SetReg, GetDoc, 0);

    PIN_StartProgram();
    return 0;
}


/*
 * Pin calls this function to get the value of an emulated register.
 */
static VOID GetReg(unsigned toolRegId, THREADID tid, CONTEXT *ctxt, VOID *data, VOID *)
{
    PrintEmulated();

    switch (toolRegId)
    {
    case EMULATED_REG_RCX:
      {
        ADDRINT *val = static_cast<ADDRINT *>(data);
        *val = PIN_GetContextReg(ctxt, REG_RCX);
        break;
      }
    case EMULATED_REG_RSP:
      {
        ADDRINT *val = static_cast<ADDRINT *>(data);
        *val = PIN_GetContextReg(ctxt, REG_RSP);
        break;
      }
    case EMULATED_REG_FPSW:
      {
        UINT32 *val = static_cast<UINT32 *>(data);
        *val = static_cast<UINT32>(PIN_GetContextReg(ctxt, REG_FPSW));
        break;
      }
    case EMULATED_REG_ST0:
      {
        FPSTATE fpstate;
        PIN_GetContextFPState(ctxt, &fpstate);
        std::memcpy(data, &fpstate.fxsave_legacy._sts[0], 10);
        break;
      }
    case EMULATED_REG_XMM0:
      {
        FPSTATE fpstate;
        PIN_GetContextFPState(ctxt, &fpstate);
        std::memcpy(data, &fpstate.fxsave_legacy._xmms[0], 16);
        break;
      }
    default:
      {
        ASSERTX(0);
        break;
      }
    }
}


/*
 * Pin calls this function to set the value of an emulated register.
 */
static VOID SetReg(unsigned toolRegId, THREADID tid, CONTEXT *ctxt, const VOID *data, VOID *)
{
    PrintEmulated();

    switch (toolRegId)
    {
    case EMULATED_REG_RCX:
      {
        const ADDRINT *val = static_cast<const ADDRINT *>(data);
        PIN_SetContextReg(ctxt, REG_RCX, *val);
        break;
      }
    case EMULATED_REG_RSP:
      {
        const ADDRINT *val = static_cast<const ADDRINT *>(data);
        PIN_SetContextReg(ctxt, REG_RSP, *val);
        break;
      }
    case EMULATED_REG_FPSW:
      {
        const UINT32 *val = static_cast<const UINT32 *>(data);
        PIN_SetContextReg(ctxt, REG_FPSW, static_cast<ADDRINT>(*val));
        break;
      }
    case EMULATED_REG_ST0:
      {
        FPSTATE fpstate;
        PIN_GetContextFPState(ctxt, &fpstate);
        std::memcpy(&fpstate.fxsave_legacy._sts[0], data, 10);
        PIN_SetContextFPState(ctxt, &fpstate);
        break;
      }
    case EMULATED_REG_XMM0:
      {
        FPSTATE fpstate;
        PIN_GetContextFPState(ctxt, &fpstate);
        std::memcpy(&fpstate.fxsave_legacy._xmms[0], data, 16);
        PIN_SetContextFPState(ctxt, &fpstate);
        break;
      }
    default:
      {
        ASSERTX(0);
        break;
      }
    }
}


/*
 * Pin calls this function to get the content of the XML documents above.
 */
static USIZE GetDoc(const std::string &name, USIZE size, void *buf, VOID *)
{
    const char *content = 0;
    size_t docSize = 0;

    if (name == "target.xml")
    {
        content = FeatureDocumentTop;
        docSize = sizeof(FeatureDocumentTop)-1;
    }
    else if (name == "64bit-core.xml")
    {
        content = FeatureDocumentCore;
        docSize = sizeof(FeatureDocumentCore)-1;
    }
    else if (name == "64bit-linux.xml")
    {
        content = FeatureDocumentLinux;
        docSize = sizeof(FeatureDocumentLinux)-1;
    }
    else if (name == "64bit-sse.xml")
    {
        content = FeatureDocumentSSE;
        docSize = sizeof(FeatureDocumentSSE)-1;
    }
    else
    {
        return 0;   // Unknown document
    }

    if (docSize <= size)
        std::memcpy(buf, content, docSize);
    return docSize;
}


static void PrintEmulated()
{
    static bool printed = false;

    if (!printed)
    {
        std::cerr << "Tool is emulating registers" << std::endl;
        printed = true;
    }
}
