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

//

//        except1.cxx

//

//        Exception test 1

//

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

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

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

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

//

// Author(s):     dsm

// Contributors:  dsm, jlarmour

// Date:          1999-02-16

// Description:   Test basic exception functionality

//####DESCRIPTIONEND####

#include <pkgconf/kernel.h>

#include <cyg/infra/testcase.h>

#ifdef CYGPKG_KERNEL_EXCEPTIONS

#include <cyg/kernel/sched.hxx>         // Cyg_Scheduler::start()

#include <cyg/kernel/thread.hxx>        // Cyg_Thread

#include <cyg/kernel/intr.hxx>          // cyg_VSR

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

#include <cyg/kernel/sched.inl>

#include <cyg/kernel/thread.inl>

#define NTHREADS 1

#include "testaux.hxx"

#ifndef CYGPKG_HAL_ARM_PID

#define EXCEPTION_DATA_ACCESS

#endif

static int d0;

#ifdef EXCEPTION_DATA_ACCESS

static cyg_exception_handler handler0;

static void handler0(CYG_ADDRWORD data, cyg_code number, CYG_ADDRWORD info)

{

    CYG_TEST_INFO("handler 0 called");

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

    // ignore machine specific stuff

    CYG_UNUSED_PARAM(cyg_code, number);

    CYG_UNUSED_PARAM(CYG_ADDRWORD, info);

    CYG_TEST_PASS_FINISH("Except 1 OK");

}

#endif

static void handler1(CYG_ADDRWORD data, cyg_code number, CYG_ADDRWORD info)

{

    CYG_TEST_INFO("handler 1 called");

    CYG_TEST_CHECK((CYG_ADDRWORD)&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, number);

#endif

    CYG_TEST_CHECK((CYG_ADDRWORD)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 n;

#endif

    cyg_exception_handler *old_handler, *old_handler1;

    CYG_ADDRWORD old_data, old_data1;

    Cyg_Thread *p=Cyg_Thread::self();

    CYG_UNUSED_PARAM(CYG_ADDRESS, data);

    p->register_exception(

        CYGNUM_HAL_EXCEPTION_MAX,

        &handler1,

        (CYG_ADDRWORD)&d0,

        &old_handler,

        &old_data);

    p->register_exception(

        CYGNUM_HAL_EXCEPTION_MAX,

        &handler1,

        (CYG_ADDRWORD)&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)&d0,

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

    p->deliver_exception(CYGNUM_HAL_EXCEPTION_MAX, (CYG_ADDRWORD)99);

    CYG_TEST_INFO("handler 1 returned");

    p->deregister_exception(CYGNUM_HAL_EXCEPTION_MAX);

    p->deregister_exception(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++) {

        p->register_exception(

            n,

            handler0,

            (CYG_ADDRWORD)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

externC cyg_VSR __default_exception_vsr;

cyg_VSR *old_vsr;

#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

    new_thread(entry0, 0);

    Cyg_Scheduler::start();

    CYG_TEST_FAIL_FINISH("Not reached");

}

externC void

cyg_start( void )

{

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

    cyg_hal_invoke_constructors();

#endif

    except0_main();

}

#else // def CYGPKG_KERNEL_EXCEPTIONS

externC void

cyg_start( void )

{

    CYG_TEST_INIT();

    CYG_TEST_NA("Exceptions disabled");

}

#endif // def CYGPKG_KERNEL_EXCEPTIONS

// EOF except1.cxx