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

//

//      signal2.c

//

//      ISO C signal handling test

//

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

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

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

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//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-18

// Purpose:       Test hardware signal functionality

// Description:   This file contains a number of tests for ISO C signal

//                handling when used with hardware exceptions

// Usage:         

//

//####DESCRIPTIONEND####

//

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

// CONFIGURATION

#include <pkgconf/system.h>

#include <pkgconf/libc_signals.h>  // C library signals configuration

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/infra/testcase.h>    // Test infrastructure

#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

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

                                   // HAL_VSR_SET_TO_ECOS_HANDLER

#include <signal.h>                // Signal functions

#include <setjmp.h>                // setjmp(), longjmp()

// STATICS

static int state;

static jmp_buf jbuf;

#endif

// FUNCTIONS

#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

static void

myhandler(int sig)

{

    __sighandler_t handler1;

    CYG_TEST_INFO("myhandler() called");

    ++state;

    handler1 = signal(sig, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "handler reset itself to default");

    longjmp(jbuf, 1);

} // myhandler()

static void

cause_memerror(void)

{

#ifdef CYGPKG_HAL_I386

    // In the x86 architecture, although we have the DATA_ACCESS

    // exception available, it is not possible to provoke it using the

    // normal code of this test. This is because the normal segments we

    // have installed in the segment registers cover all of memory. Instead we

    // set GS to a descriptor that does not cover 0xF0000000-0xFFFFFFFF and

    // poke at that.

    __asm__ ( "movw     $0x20,%%ax\n"

              "movw     %%ax,%%gs\n"

              "movl     %%gs:0xF0000000,%%eax\n"

              :

              :

              : "eax"

            );

#else    

    volatile int x;

    volatile CYG_ADDRESS p=(CYG_ADDRESS) &state;

    do {

        // do a read which prevents us accidentally writing over something

        // important. Make it misaligned to increase the chances of an

        // exception happening

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

        p += (CYG_ADDRESS)0x100000;

    } while(p != 0);

#endif    

} // cause_memerror()

// num must always be 0 - do it this way in case the optimizer tries to

// get smart

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()

volatile int tmp;

#endif

int

main( int argc, char *argv[] )

{

#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

    __sighandler_t handler1;

    // special callout to request GDB to alter its handling of signals

    CYG_TEST_GDBCMD("handle SIGBUS nostop");

    CYG_TEST_GDBCMD("handle SIGSEGV nostop");

    CYG_TEST_GDBCMD("handle SIGILL nostop");

    CYG_TEST_GDBCMD("handle SIGFPE nostop");

    CYG_TEST_GDBCMD("handle SIGSYS nostop");

#endif // ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

    CYG_TEST_INIT();

#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

    // Avoid compiler warnings if tests are not applicable.

    if (0) cause_memerror();

    if (0) cause_fpe(0);

#endif

    CYG_TEST_INFO("Starting tests from testcase " __FILE__ " for C "

                  "library signal functions");

// Now reset the exception handlers various to eCos handlers so that we

// have control; this is the target side equivalent of the CYG_TEST_GDBCMD

// lines above:

#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

#ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS

    // Test 1

    CYG_TEST_INFO("Test 1");

    handler1 = signal(SIGSEGV, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGSEGV handler initialized to default");

    handler1 = signal(SIGBUS, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGBUS handler initialized to default");

    handler1 = signal(SIGILL, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGILL handler initialized to default");

    handler1 = signal(SIGSYS, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGSYS handler initialized to default");

    handler1 = signal(SIGTRAP, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGTRAP handler initialized to default");

    handler1 = signal(SIGFPE, &myhandler);

    CYG_TEST_PASS_FAIL(handler1 == SIG_DFL,

                       "SIGFPE handler initialized to default");

    // Test 2

    CYG_TEST_INFO("Test 2");

    state = 2;

#if defined(CYGPKG_HAL_POWERPC_SIM)

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

    // PR 19945 workaround.

    CYG_TEST_PASS("Test 2 not applicable to PowerPC SIM");

#else

    if (0==setjmp(jbuf)) {

        cause_memerror();

        CYG_TEST_FAIL("Didn't cause exception");

    }

    CYG_TEST_PASS_FAIL(3==state, "handler returned correctly");

#endif

    // Test 3

    CYG_TEST_INFO("Test 3");

    state = 3;

#ifdef CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO

    if (0==setjmp(jbuf)) {

        // It is necessary to save the return value in a volatile

        // variable, or GCC will get rid of the call.

        tmp = cause_fpe(0);

        CYG_TEST_FAIL("Didn't cause exception");

    }

    CYG_TEST_PASS_FAIL(4==state, "handler returned correctly");

#else

    CYG_TEST_INFO("Test 3 - provoke FP error - not supported");

#endif    

#else

    CYG_TEST_NA("Testing not applicable to this configuration");

#endif

    CYG_TEST_FINISH("Finished tests from testcase " __FILE__ " for C "

                    "library signal functions");

    return 0;

} // main()

// EOF signal2.c