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/*=================================================================

//

//        kexcept1.cxx

//

//        Kernel C API Exception test 1

//

//=================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

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

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

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// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

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// this file might be covered by the GNU General Public License.

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//####ECOSGPLCOPYRIGHTEND####

//=================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     dsm

// Contributors:  dsm, jlarmour

// Date:          1999-02-16

// Description:   Test basic exception functionality

//####DESCRIPTIONEND####

*/

#include <cyg/hal/hal_arch.h>           // CYGNUM_HAL_STACK_SIZE_TYPICAL

#include <cyg/kernel/kapi.h>

#include <cyg/infra/testcase.h>

#ifdef CYGPKG_KERNEL_EXCEPTIONS

#ifdef CYGFUN_KERNEL_API_C

#include <cyg/hal/hal_intr.h>           // exception ranges

#include "testaux.h"

#ifndef CYGPKG_HAL_ARM_PID

#define EXCEPTION_DATA_ACCESS

#endif

#define NTHREADS 1

#define STACKSIZE CYGNUM_HAL_STACK_SIZE_TYPICAL

static cyg_handle_t thread[NTHREADS];

static cyg_thread thread_obj[NTHREADS];

static char stack[NTHREADS][STACKSIZE];

#ifdef EXCEPTION_DATA_ACCESS

static cyg_exception_handler_t handler0;

static void handler0(cyg_addrword_t data, cyg_code_t number, cyg_addrword_t info)

{

    CYG_TEST_INFO("handler 0 called");

    CYG_TEST_CHECK((cyg_addrword_t)123 == data, "handler given wrong data");

    // ignore machine specific stuff

    CYG_UNUSED_PARAM(cyg_code_t, number);

    CYG_UNUSED_PARAM(cyg_addrword_t, info);

    CYG_TEST_PASS_FINISH("Except 1 OK");

}

#endif

static int d0;

static void handler1(cyg_addrword_t data, cyg_code_t number, cyg_addrword_t info)

{

    CYG_TEST_INFO("handler 1 called");

    CYG_TEST_CHECK((cyg_addrword_t)&d0 == data, "handler given wrong data");

#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE

    CYG_TEST_CHECK(number == CYGNUM_HAL_EXCEPTION_MAX, "handler given wrong number");

#else

    CYG_UNUSED_PARAM(cyg_code_t, number);

#endif

    CYG_TEST_CHECK((cyg_addrword_t)99 == info, "handler given wrong info");

}

#ifdef EXCEPTION_DATA_ACCESS

// The following function attempts to cause an exception in various

// hacky ways.  It is machine dependent what exception is generated.

// It does reads rather than writes hoping not to corrupt anything

// important.

static int

cause_fpe(int num)

{

    double a;

    a = 1.0/num;                        // Depending on FPU emulation and/or

                                        // the FPU architecture, this may

                                        // cause an exception.

                                        // (float division by zero)

    return ((int)a)/num;                // This may cause an exception if

                                        // the architecture supports it.

                                        // (integer division by zero).

} // cause_fpe()

void cause_exception(void)

{

    int x;

    unsigned int p=0;

    // First try for an address exception (unaligned access exception

    // or SEGV/BUS exceptions)

    do {

        x=*(volatile int *)(p-1);

        p+=0x100000;

    } while(p != 0);

    // Next try an integer or floating point divide-by-zero exception.

    cause_fpe(0);

}

#endif

static void entry0( CYG_ADDRWORD data )

{

#ifdef EXCEPTION_DATA_ACCESS

    cyg_code_t n;

#endif

    cyg_exception_handler_t *old_handler, *old_handler1;

    cyg_addrword_t old_data, old_data1;

    CYG_UNUSED_PARAM(CYG_ADDRESS, data);

    cyg_exception_set_handler(

        CYGNUM_HAL_EXCEPTION_MAX,

        &handler1,

        (cyg_addrword_t)&d0,

        &old_handler,

        &old_data);

    cyg_exception_set_handler(

        CYGNUM_HAL_EXCEPTION_MAX,

        &handler1,

        (cyg_addrword_t)&d0,

        &old_handler1,

        &old_data1);

    CYG_TEST_CHECK(old_handler1 == &handler1,

        "register exception: old_handler not the one previously registered");

    CYG_TEST_CHECK(old_data1 == (cyg_addrword_t)&d0,

        "register exception: old_data not those previously registered");

    cyg_exception_call_handler(

        cyg_thread_self(),

        CYGNUM_HAL_EXCEPTION_MAX,

        (cyg_addrword_t)99);

    CYG_TEST_INFO("handler 1 returned");

    cyg_exception_clear_handler(CYGNUM_HAL_EXCEPTION_MAX);

    cyg_exception_clear_handler(CYGNUM_HAL_EXCEPTION_MAX);

#ifdef EXCEPTION_DATA_ACCESS

#if 0

#elif defined(CYGPKG_HAL_POWERPC_SIM)

    // The exception generated by the SIM is not recognized by GDB.

    // PR 19945 workaround.

    CYG_TEST_NA("Not applicable to PowerPC SIM");

#endif

    for(n = CYGNUM_HAL_EXCEPTION_MIN; n <= CYGNUM_HAL_EXCEPTION_MAX; n++) {

        cyg_exception_set_handler(

            n,

            handler0,

            (cyg_addrword_t)123,

            &old_handler1,

            &old_data1);

    }

    CYG_TEST_PASS("Attempting to provoke exception");

    cause_exception();

    CYG_TEST_FAIL_FINISH("Couldn't cause exception");

#else // EXCEPTION_DATA_ACCESS

    CYG_TEST_NA("Platform does not support data exceptions");

#endif

}

#ifdef CYG_HAL_MIPS_TX39_JMR3904

extern void __default_exception_vsr(void);

#endif

void except0_main( void )

{

    // Use CYG_TEST_GDBCMD _before_ CYG_TEST_INIT()

    CYG_TEST_GDBCMD("handle SIGBUS nostop");

    CYG_TEST_GDBCMD("handle SIGSEGV nostop");

    CYG_TEST_GDBCMD("handle SIGFPE nostop");

    CYG_TEST_INIT();

#ifdef HAL_VSR_SET_TO_ECOS_HANDLER

    // Reclaim the VSR off CygMon possibly

#ifdef CYGNUM_HAL_EXCEPTION_DATA_ACCESS

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_DATA_ACCESS, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_FPU

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_FPU, NULL );

#endif

#ifdef CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO

    HAL_VSR_SET_TO_ECOS_HANDLER( CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO, NULL );

#endif

#endif

    cyg_thread_create(4, entry0 , (cyg_addrword_t)0, "kexcept1",

        (void *)stack[0], STACKSIZE, &thread[0], &thread_obj[0]);

    cyg_thread_resume(thread[0]);

    cyg_scheduler_start();

    CYG_TEST_FAIL_FINISH("Not reached");

}

externC void

cyg_start( void )

{

    except0_main();

}

#else // def CYGFUN_KERNEL_API_C

#define N_A_MSG "Kernel C API layer disabled"

#endif // def CYGFUN_KERNEL_API_C

#else // def CYGPKG_KERNEL_EXCEPTIONS

#define N_A_MSG "Exceptions disabled"

#endif // def CYGPKG_KERNEL_EXCEPTIONS

#ifdef N_A_MSG

externC void

cyg_start( void )

{

    CYG_TEST_INIT();

    CYG_TEST_NA( N_A_MSG);

}

#endif // N_A_MSG

/* EOF kexcept1.c */