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

//

//      hal_misc.c

//

//      Common HAL miscellaneous functions

//

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

//####ECOSGPLCOPYRIGHTBEGIN####

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

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

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

//

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

//

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// 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

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//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):    nickg

// Contributors: nickg, jskov

// Date:         2000-06-08

// Purpose:      HAL miscellaneous functions

// Description:  This file contains miscellaneous functions provided by the

//               HAL.

//

//####DESCRIPTIONEND####

//

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

#include <pkgconf/hal.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_if.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_misc.h>           // our header

#include <cyg/infra/cyg_type.h>         // Base types

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

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

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

// Macro for finding return address. 

#ifndef CYGARC_HAL_GET_RETURN_ADDRESS

#define CYGARC_HAL_GET_RETURN_ADDRESS(_x_, _dummy_)     \

    CYG_MACRO_START                                     \

    (_dummy_) = 1;                                      \

    (_x_) = (CYG_ADDRWORD)&&__backup_return_address;    \

    CYG_MACRO_END

#define CYGARC_HAL_GET_RETURN_ADDRESS_BACKUP(_dummy_)   \

    CYG_MACRO_START                                     \

__backup_return_address:                                \

    if ((_dummy_)-- > 0)                                \

        goto __backup_return_address;                   \

    CYG_MACRO_END

#endif

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

// Macro for finding PC in saved regs

#ifndef CYGARC_HAL_GET_PC_REG

#define CYGARC_HAL_GET_PC_REG(_regs_,_val_) ((_val_) = (_regs_)->pc)

#endif

#if defined(CYGPKG_CYGMON)

unsigned long cygmon_memsize = 0;

#endif

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

// Functions to support the detection and execution of a user provoked

// program break. These are usually called from interrupt routines.

cyg_bool

cyg_hal_is_break(char *buf, int size)

{

    while( size )

        if( buf[--size] == 0x03 ) return true;

    return false;

}

// Keep this variable global, to prevent the compiler removing it (and

// the goto-reference) due to being local to the function where it is

// used. Yes, it's ugly.

int _cyg_hal_compiler_dummy;

void

cyg_hal_user_break( CYG_ADDRWORD *regs )

{

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \

    || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon) \

    || defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)

    CYG_ADDRWORD __ra;

    CYG_WORD32 __pc;

    HAL_SavedRegisters *sreg = (HAL_SavedRegisters *)regs;

    CYGARC_HAL_GET_RETURN_ADDRESS(__ra, _cyg_hal_compiler_dummy);

    if( regs == NULL ) __pc = __ra;

    else  CYGARC_HAL_GET_PC_REG(sreg, __pc);

    CYGACC_CALL_IF_INSTALL_BPT_FN((void *)__pc);

    CYGARC_HAL_GET_RETURN_ADDRESS_BACKUP(_cyg_hal_compiler_dummy);

#else

    HAL_BREAKPOINT(breakinst);

#endif

}

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

// The system default interrupt ISR. It calls the architecture default

// ISR as well if necessary.

externC cyg_uint32 hal_arch_default_isr(CYG_ADDRWORD vector,

                                        CYG_ADDRWORD data);

cyg_uint32

hal_default_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)

{

    cyg_uint32 result;

#if (defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)           \

     || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)) &&    \

        (defined(CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT) ||     \

          defined(CYGHWR_HAL_GDB_PORT_VECTOR) &&           \

          defined(HAL_CTRLC_ISR))

#ifndef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN    

#if CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

    int gdb_vector = -1;

    // This check only to avoid crash on older stubs in case of unhandled

    // interrupts. It is a bit messy, but required in a transition period.

#ifndef CYGSEM_HAL_ROM_MONITOR

    if (CYGNUM_CALL_IF_TABLE_VERSION_CALL_HACK ==

        (CYGACC_CALL_IF_VERSION() & CYGNUM_CALL_IF_TABLE_VERSION_CALL_MASK))

#endif

    {

        hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();

        if (__chan)

            gdb_vector = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_DBG_ISR_VECTOR);

    }

    if( vector == gdb_vector )

#else

    // Old code using hardwired channels. This should go away eventually.

    if( vector == CYGHWR_HAL_GDB_PORT_VECTOR )

#endif

#endif

    {

        result = HAL_CTRLC_ISR( vector, data );

        if( 0 != result ) return result;

    }

#endif

    result = hal_arch_default_isr (vector, data);

    if( 0 != result) return result;

    CYG_TRACE2(true, "Interrupt: %d, Data: 0x%08x", vector, data);

    CYG_FAIL("Spurious Interrupt!!!");

    return 0;

}

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

// End of hal_misc.c