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

//

//      calm16-stub.h

//

//      Helper functions for stub, generic to all CalmRISC16 processors

//

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

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//

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

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

//

// Author(s):     Red Hat, msalter

// Contributors:  Red Hat, msalter

// Date:          2001-02-12

// Purpose:       

// Description:   Helper functions for stub, generic to CalmRISC16 processors

// Usage:         

//

//####DESCRIPTIONEND####

//

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

#include <stddef.h>

#include <pkgconf/hal.h>

#ifdef CYGPKG_REDBOOT

#include <pkgconf/redboot.h>

#endif

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS

#include <cyg/hal/hal_stub.h>

#define CYGARC_HAL_COMMON_EXPORT_CPU_MACROS

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_intr.h>

typedef cyg_uint16 t_inst;

/*----------------------------------------------------------------------

 * Asynchronous interrupt support

 */

static struct

{

  t_inst *targetAddr;

  t_inst savedInstr;

} asyncBuffer;

/* Called to asynchronously interrupt a running program.

   Must be passed address of instruction interrupted.

   This is typically called in response to a debug port

   receive interrupt.

*/

void

install_async_breakpoint(void *pc)

{

  asyncBuffer.targetAddr = pc;

  asyncBuffer.savedInstr = *(t_inst *)pc;

  *(t_inst *)pc = *(t_inst *)_breakinst;

  __instruction_cache(CACHE_FLUSH);

  __data_cache(CACHE_FLUSH);

}

/*--------------------------------------------------------------------*/

/* Given a trap value TRAP, return the corresponding signal. */

int __computeSignal (unsigned int trap_number)

{

    switch (trap_number) {

      case CYGNUM_HAL_VECTOR_FIQ:

//    case CYGNUM_HAL_VECTOR_IRQ:

        return SIGINT;

    }

    return SIGTRAP;

}

/* Return the trap number corresponding to the last-taken trap. */

int __get_trap_number (void)

{

    // The vector is not not part of the GDB register set so get it

    // directly from the save context.

    return _hal_registers->vector;

}

#if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)

int __is_bsp_syscall(void)

{

    return __get_trap_number() >= CYGNUM_HAL_VECTOR_SWI;

}

#endif

/* Set the current pc register value based on current vector. */

void set_pc (target_register_t pc)

{

    put_register (REG_PC, pc);

    switch (__get_trap_number()) {

      case CYGNUM_HAL_VECTOR_FIQ:

        put_register (REG_SPC_FIQ, pc);

        break;

      case CYGNUM_HAL_VECTOR_SWI:

        put_register (REG_LR, pc);

        break;

      default:

        put_register (REG_SPC_IRQ, pc);

        break;

    }

}

/* Get the current pc register value based on current vector. */

target_register_t get_pc(void)

{

    switch (__get_trap_number()) {

      case CYGNUM_HAL_VECTOR_SWI:

        return get_register (REG_LR);

      case CYGNUM_HAL_VECTOR_FIQ:

        return get_register (REG_SPC_FIQ);

      default:

        break;

    }

    return get_register (REG_SPC_IRQ);

}

/*----------------------------------------------------------------------

 * Single-step support

 */

/* Set things up so that the next user resume will execute one instruction.

   This may be done by setting breakpoints or setting a single step flag

   in the saved user registers, for example. */

void __single_step (void)

{

    put_register(REG_SR, get_register(REG_SR) | ((target_register_t)CYGARC_SR_TE << 16));

}

/* Clear the single-step state. */

void __clear_single_step (void)

{

    put_register(REG_SR, get_register(REG_SR) & ~((target_register_t)CYGARC_SR_TE << 16));

}

void __install_breakpoints ()

{

  /* Install the breakpoints in the breakpoint list */

  __install_breakpoint_list();

}

void __clear_breakpoints (void)

{

  __clear_breakpoint_list();

}

/* If the breakpoint we hit is in the breakpoint() instruction, return a

   non-zero value. */

int

__is_breakpoint_function ()

{

    return get_pc() == (target_register_t)(unsigned long)&_breakinst;

}

/* Skip the current instruction.  Since this is only called by the

   stub when the PC points to a breakpoint or trap instruction,

   we can safely just skip 2. */

void __skipinst (void)

{

    set_pc(get_pc() + 2);

}

unsigned short __read_prog_uint16(void *addr)

{

    unsigned val;

    asm("ldc %0, @%1" : "=r"(val) : "r"(addr) );

    return val;

}

unsigned char __read_prog_uint8(void *addr)

{

    unsigned short s;

    int is_odd = ((unsigned long)addr & 1) == 1;

    s = __read_prog_uint16((void *)((unsigned long)addr & ~1));

    if (is_odd)

        return s & 0xff;

    else

        return (s >> 8) & 0xff;

}

unsigned long __read_prog_uint32(void *addr)

{

    unsigned long u;

    u = (unsigned long)__read_prog_uint16(addr) << 16;

    u |= __read_prog_uint16((void *)((unsigned long)addr + 2));

    return u;

}

void __write_prog_uint16(void *addr, unsigned short val)

{

    hal_plf_write_prog_halfword((unsigned long)addr, val);

}

void __write_prog_uint32(void *addr, unsigned long val)

{

    hal_plf_write_prog_halfword((unsigned long)addr, (val >> 16) & 0xffff);

    hal_plf_write_prog_halfword((unsigned long)addr + 2, val & 0xffff);

}

void __write_prog_uint8(void *addr, unsigned char val)

{

    unsigned short s;

    int is_odd = ((unsigned long)addr & 1) == 1;

    s = __read_prog_uint16((void *)((unsigned long)addr & ~1));

    if (is_odd)

        s = (s & 0xff00) | val;

    else

        s = (s & 0xff) | (val << 8);

    hal_plf_write_prog_halfword((unsigned long)addr & ~1, s);

}

#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS