kexcept1.c

ecos为实时嵌入式操作系统

/*=================================================================
//
//        kexcept1.cxx
//
//        Kernel C API Exception test 1
//
//=================================================================
//####COPYRIGHTBEGIN####
//
// -------------------------------------------
// The contents of this file are subject to the Cygnus eCos Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License.  You may obtain a copy of the License at
// http://sourceware.cygnus.com/ecos
// 
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
// License for the specific language governing rights and limitations under
// the License.
// 
// The Original Code is eCos - Embedded Cygnus Operating System, released
// September 30, 1998.
// 
// The Initial Developer of the Original Code is Cygnus.  Portions created
// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
// -------------------------------------------
//
//####COPYRIGHTEND####
//=================================================================
//#####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"

#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];


static cyg_exception_handler_t handler0;
static int d0;

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");
}

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");
}


// 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.
void cause_exception(void)
{
    int x;
    unsigned int p=0;

    do {
        x=*(volatile int *)(p-1)/p;
        p+=0x100000;
    } while(p != 0);
}

static void entry0( CYG_ADDRWORD data )
{
    cyg_code_t n;
    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 CYGPKG_HAL_I386_LINUX
    // We can't catch segmentation violation exceptions on Linux.
    CYG_TEST_PASS_FINISH("Except 1 OK");
#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");
}

#ifdef CYG_HAL_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_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_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
#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 */