/* Microsoft Reference Implementation for TPM 2.0
 *
 *  The copyright in this software is being made available under the BSD License,
 *  included below. This software may be subject to other third party and
 *  contributor rights, including patent rights, and no such rights are granted
 *  under this license.
 *
 *  Copyright (c) Microsoft Corporation
 *
 *  All rights reserved.
 *
 *  BSD License
 *
 *  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.
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 *  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.
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
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 */

//**Introduction
// This module provides the platform specific entry and fail processing. The
// _plat__RunCommand() function is used to call to ExecuteCommand() in the TPM code.
// This function does whatever processing is necessary to set up the platform
// in anticipation of the call to the TPM including settup for error processing.
//
// The _plat__Fail() function is called when there is a failure in the TPM. The TPM
// code will have set the flag to indicate that the TPM is in failure mode.
// This call will then recursively call ExecuteCommand in order to build the
// failure mode response. When ExecuteCommand() returns to _plat__Fail(), the
// platform will do some platform specif operation to return to the environment in
// which the TPM is executing. For a simulator, setjmp/longjmp is used. For an OS,
// a system exit to the OS would be appropriate.

//** Includes and locals
#include "PlatformData.h"
#include "Platform_fp.h"
#include <setjmp.h>
#include "ExecCommand_fp.h"
#include "StmUtil.h"

jmp_buf s_jumpBuffer;

//** Functions

//***_plat__RunCommand()
// This version of RunCommand will set up a jum_buf and call ExecuteCommand(). If
// the command executes without failing, it will return and RunCommand will return.
// If there is a failure in the command, then _plat__Fail() is called and it will
// longjump back to RunCommand which will call ExecuteCommand again. However, this
// time, the TPM will be in failure mode so ExecuteCommand will simply build
// a failure response and return.
LIB_EXPORT void
_plat__RunCommand(
    unsigned int     requestSize,   // IN: command buffer size
    unsigned char   *request,       // IN: command buffer
    unsigned int    *responseSize,  // IN/OUT: response buffer size
    unsigned char   **response      // IN/OUT: response buffer
    )
{
    setjmp(s_jumpBuffer);
    ExecuteCommand((uint32_t)requestSize, request, (uint32_t*)responseSize, response);
}

//***_plat__Fail()
// This is the platform depended failure exit for the TPM.
LIB_EXPORT NORETURN void
_plat__FailDetailed(
    char * file,
    int line,
    const char * func
    )
{
    dbgPrint("TPMFAIL: %s (%s@%d)\r\n", func, file, line);
    longjmp(&s_jumpBuffer[0], 1);
}
