hal_stub.c

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

        ptr = __mem2hex((char *)&extend_val, ptr, REGSIZE(SP) - sizeof(addr), 0);
    }
    ptr = __mem2hex((char *)&addr, ptr, sizeof(addr), 0);
    *ptr++ = ';';

    HAL_STUB_ARCH_T_PACKET_EXTRAS(ptr);
    
    *ptr++ = 0;
}


//-----------------------------------------------------------------------------
// Cache functions.

// Perform the specified operation on the instruction cache. 
// Returns 1 if the cache is enabled, 0 otherwise.
int 
__instruction_cache (cache_control_t request)
{
    int state = 1;

    switch (request) {
    case CACHE_ENABLE:
        HAL_ICACHE_ENABLE();
        break;
    case CACHE_DISABLE:
        HAL_ICACHE_DISABLE();
        state = 0;
        break;
    case CACHE_FLUSH:
        HAL_ICACHE_SYNC();
        break;
    case CACHE_NOOP:
        /* fall through */
    default:
        break;
    }

#ifdef HAL_ICACHE_IS_ENABLED
    HAL_ICACHE_IS_ENABLED(state);
#endif

    return state;
}

// Perform the specified operation on the data cache. 
// Returns 1 if the cache is enabled, 0 otherwise.
int 
__data_cache (cache_control_t request)
{
    int state = 1;

    switch (request) {
    case CACHE_ENABLE:
        HAL_DCACHE_ENABLE();
        break;
    case CACHE_DISABLE:
        HAL_DCACHE_DISABLE();
        state = 0;
        break;
    case CACHE_FLUSH:
        HAL_DCACHE_SYNC();
        break;
    case CACHE_NOOP:
        /* fall through */
    default:
        break;
    }
#ifdef HAL_DCACHE_IS_ENABLED
    HAL_DCACHE_IS_ENABLED(state);
#endif

    return state;
}

//-----------------------------------------------------------------------------
// Memory accessor functions.

// The __mem_fault_handler pointer is volatile since it is only
// set/cleared by the function below - which does not rely on any
// other functions, so the compiler may decide to not bother updating
// the pointer at all. If any of the memory accesses cause an
// exception, the pointer must be set to ensure the exception handler
// can make use of it.

void* volatile __mem_fault_handler = (void *)0;

/* These are the "arguments" to __do_read_mem and __do_write_mem, 
   which are passed as globals to avoid squeezing them thru
   __set_mem_fault_trap.  */

static volatile target_register_t memCount;

static void
__do_copy_mem (unsigned char* src, unsigned char* dst)
{
    unsigned long *long_dst;
    unsigned long *long_src;
    unsigned short *short_dst;
    unsigned short *short_src;

    // Zero memCount is not really an error, but the goto is necessary to
    // keep some compilers from reordering stuff across the 'err' label.
    if (memCount == 0) goto err;

    __mem_fault = 1;                      /* Defaults to 'fail'. Is cleared */
                                          /* when the copy loop completes.  */
    __mem_fault_handler = &&err;

    // See if it's safe to do multi-byte, aligned operations
    while (memCount) {
        if ((memCount >= sizeof(long)) &&
            (((target_register_t)dst & (sizeof(long)-1)) == 0) &&
            (((target_register_t)src & (sizeof(long)-1)) == 0)) {
        
            long_dst = (unsigned long *)dst;
            long_src = (unsigned long *)src;

            *long_dst++ = *long_src++;
            memCount -= sizeof(long);

            dst = (unsigned char *)long_dst;
            src = (unsigned char *)long_src;
        } else if ((memCount >= sizeof(short)) &&
                   (((target_register_t)dst & (sizeof(short)-1)) == 0) &&
                   (((target_register_t)src & (sizeof(short)-1)) == 0)) {
            
            short_dst = (unsigned short *)dst;
            short_src = (unsigned short *)src;

            *short_dst++ = *short_src++;
            memCount -= sizeof(short);

            dst = (unsigned char *)short_dst;
            src = (unsigned char *)short_src;
        } else {
            *dst++ = *src++;
            memCount--;
        }
    }

    __mem_fault = 0;

 err:
    __mem_fault_handler = (void *)0;
}

/*
 * __read_mem_safe:
 * Get contents of target memory, abort on error.
 */

int
__read_mem_safe (void *dst, void *src, int count)
{
  if( !CYG_HAL_STUB_PERMIT_DATA_READ( src, count ) )
    return 0;

  memCount = count;
  __do_copy_mem((unsigned char*) src, (unsigned char*) dst);
  return count - memCount;      // return number of bytes successfully read
}

/*
 * __write_mem_safe:
 * Set contents of target memory, abort on error.
 */

int
__write_mem_safe (void *src, void *dst, int count)
{
  if( !CYG_HAL_STUB_PERMIT_DATA_READ( dst, count ) )
    return 0;

  memCount = count;
  __do_copy_mem((unsigned char*) src, (unsigned char*) dst);
  return count - memCount;      // return number of bytes successfully written
}

#ifdef TARGET_HAS_HARVARD_MEMORY
static void
__do_copy_from_progmem (unsigned char* src, unsigned char* dst)
{
    unsigned long *long_dst;
    unsigned long *long_src;
    unsigned short *short_dst;
    unsigned short *short_src;

    // Zero memCount is not really an error, but the goto is necessary to
    // keep some compilers from reordering stuff across the 'err' label.
    if (memCount == 0) goto err;

    __mem_fault = 1;                      /* Defaults to 'fail'. Is cleared */
                                          /* when the copy loop completes.  */
    __mem_fault_handler = &&err;

    // See if it's safe to do multi-byte, aligned operations
    while (memCount) {
        if ((memCount >= sizeof(long)) &&
            (((target_register_t)dst & (sizeof(long)-1)) == 0) &&
            (((target_register_t)src & (sizeof(long)-1)) == 0)) {
        
            long_dst = (unsigned long *)dst;
            long_src = (unsigned long *)src;

            *long_dst++ = __read_prog_uint32(long_src++);
            memCount -= sizeof(long);

            dst = (unsigned char *)long_dst;
            src = (unsigned char *)long_src;
        } else if ((memCount >= sizeof(short)) &&
                   (((target_register_t)dst & (sizeof(short)-1)) == 0) &&
                   (((target_register_t)src & (sizeof(short)-1)) == 0)) {
            
            short_dst = (unsigned short *)dst;
            short_src = (unsigned short *)src;

            *short_dst++ = __read_prog_uint16(short_src++);
            memCount -= sizeof(short);

            dst = (unsigned char *)short_dst;
            src = (unsigned char *)short_src;
        } else {
            *dst++ = __read_prog_uint8(src++);
            memCount--;
        }
    }

    __mem_fault = 0;

 err:
    __mem_fault_handler = (void *)0;
}

static void
__do_copy_to_progmem (unsigned char* src, unsigned char* dst)
{
    unsigned long *long_dst;
    unsigned long *long_src;
    unsigned short *short_dst;
    unsigned short *short_src;

    // Zero memCount is not really an error, but the goto is necessary to
    // keep some compilers from reordering stuff across the 'err' label.
    if (memCount == 0)	goto err;

    __mem_fault = 1;                      /* Defaults to 'fail'. Is cleared */
                                          /* when the copy loop completes.  */
    __mem_fault_handler = &&err;

    // See if it's safe to do multi-byte, aligned operations
    while (memCount) {
        if ((memCount >= sizeof(long)) &&
            (((target_register_t)dst & (sizeof(long)-1)) == 0) &&
            (((target_register_t)src & (sizeof(long)-1)) == 0)) {
        
            long_dst = (unsigned long *)dst;
            long_src = (unsigned long *)src;

            __write_prog_uint32(long_dst++, *long_src++);
            memCount -= sizeof(long);

            dst = (unsigned char *)long_dst;
            src = (unsigned char *)long_src;
        } else if ((memCount >= sizeof(short)) &&
                   (((target_register_t)dst & (sizeof(short)-1)) == 0) &&
                   (((target_register_t)src & (sizeof(short)-1)) == 0)) {
            
            short_dst = (unsigned short *)dst;
            short_src = (unsigned short *)src;

            __write_prog_uint16(short_dst++, *short_src++);
            memCount -= sizeof(short);

            dst = (unsigned char *)short_dst;
            src = (unsigned char *)short_src;
        } else {
            __write_prog_uint8(dst++, *src++);
            memCount--;
        }
    }

    __mem_fault = 0;

 err:
    __mem_fault_handler = (void *)0;
}

/*
 * __read_progmem_safe:
 * Get contents of target memory, abort on error.
 */

int
__read_progmem_safe (void *dst, void *src, int count)
{
  if( !CYG_HAL_STUB_PERMIT_CODE_READ( src, count ) )
    return 0;

  memCount = count;
  __do_copy_from_progmem((unsigned char*) src, (unsigned char*) dst);
  return count - memCount;      // return number of bytes successfully read
}

/*
 * __write_progmem_safe:
 * Set contents of target memory, abort on error.
 */

int
__write_progmem_safe (void *src, void *dst, int count)
{
  if( !CYG_HAL_STUB_PERMIT_CODE_WRITE( dst, count ) )
    return 0;

  memCount = count;
  __do_copy_to_progmem((unsigned char*) src, (unsigned char*) dst);
  return count - memCount;      // return number of bytes successfully written
}
#endif

//-----------------------------------------------------------------------------
// Target extras?!
int 
__process_target_query(char * pkt, char * out, int maxOut)
{ return 0 ; }
int 
__process_target_set(char * pkt, char * out, int maxout)
{ return 0 ; }
int 
__process_target_packet(char * pkt, char * out, int maxout)
{ return 0 ; }

// GDB string output, making sure interrupts are disabled.
// This function gets used by some diag output functions.
void 
hal_output_gdb_string(target_register_t str, int string_len)
{
    unsigned long __state;
    HAL_DISABLE_INTERRUPTS(__state);
    __output_gdb_string(str, string_len);
    HAL_RESTORE_INTERRUPTS(__state);
}

#endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS