c3-lang/libffi/src/m68k/ffi.c

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  Commit

• Hash : 8f4772f3
  Author :
  Date : 2013-01-07T06:14:53
  

  m68k fixes for signed 8 and 16-bit calls.

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• src/m68k/ffi.c

• /* -----------------------------------------------------------------------
     ffi.c
  
     m68k Foreign Function Interface
     ----------------------------------------------------------------------- */
  
  #include <ffi.h>
  #include <ffi_common.h>
  
  #include <stdlib.h>
  #include <unistd.h>
  #ifdef __rtems__
  void rtems_cache_flush_multiple_data_lines( const void *, size_t );
  #else
  #include <sys/syscall.h>
  #ifdef __MINT__
  #include <mint/mintbind.h>
  #include <mint/ssystem.h>
  #else
  #include <asm/cachectl.h>
  #endif
  #endif
  
  void ffi_call_SYSV (extended_cif *,
  		    unsigned, unsigned,
  		    void *, void (*fn) ());
  void *ffi_prep_args (void *stack, extended_cif *ecif);
  void ffi_closure_SYSV (ffi_closure *);
  void ffi_closure_struct_SYSV (ffi_closure *);
  unsigned int ffi_closure_SYSV_inner (ffi_closure *closure,
  				     void *resp, void *args);
  
  /* ffi_prep_args is called by the assembly routine once stack space has
     been allocated for the function's arguments.  */
  
  void *
  ffi_prep_args (void *stack, extended_cif *ecif)
  {
    unsigned int i;
    void **p_argv;
    char *argp;
    ffi_type **p_arg;
    void *struct_value_ptr;
  
    argp = stack;
  
    if (
  #ifdef __MINT__
        (ecif->cif->rtype->type == FFI_TYPE_LONGDOUBLE) ||
  #endif
        (((ecif->cif->rtype->type == FFI_TYPE_STRUCT)
          && !ecif->cif->flags)))
      struct_value_ptr = ecif->rvalue;
    else
      struct_value_ptr = NULL;
  
    p_argv = ecif->avalue;
  
    for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
         i != 0;
         i--, p_arg++)
      {
        size_t z = (*p_arg)->size;
        int type = (*p_arg)->type;
  
        if (z < sizeof (int))
  	{
  	  switch (type)
  	    {
  	    case FFI_TYPE_SINT8:
  	      *(signed int *) argp = (signed int) *(SINT8 *) *p_argv;
  	      break;
  
  	    case FFI_TYPE_UINT8:
  	      *(unsigned int *) argp = (unsigned int) *(UINT8 *) *p_argv;
  	      break;
  
  	    case FFI_TYPE_SINT16:
  	      *(signed int *) argp = (signed int) *(SINT16 *) *p_argv;
  	      break;
  
  	    case FFI_TYPE_UINT16:
  	      *(unsigned int *) argp = (unsigned int) *(UINT16 *) *p_argv;
  	      break;
  
  	    case FFI_TYPE_STRUCT:
  #ifdef __MINT__
  	      if (z == 1 || z == 2)
  		memcpy (argp + 2, *p_argv, z);
                else
  		memcpy (argp, *p_argv, z);
  #else
  	      memcpy (argp + sizeof (int) - z, *p_argv, z);
  #endif
  	      break;
  
  	    default:
  	      FFI_ASSERT (0);
  	    }
  	  z = sizeof (int);
  	}
        else
  	{
  	  memcpy (argp, *p_argv, z);
  
  	  /* Align if necessary.  */
  	  if ((sizeof(int) - 1) & z)
  	    z = ALIGN(z, sizeof(int));
  	}
  
        p_argv++;
        argp += z;
      }
  
    return struct_value_ptr;
  }
  
  #define CIF_FLAGS_INT		1
  #define CIF_FLAGS_DINT		2
  #define CIF_FLAGS_FLOAT		4
  #define CIF_FLAGS_DOUBLE	8
  #define CIF_FLAGS_LDOUBLE	16
  #define CIF_FLAGS_POINTER	32
  #define CIF_FLAGS_STRUCT1	64
  #define CIF_FLAGS_STRUCT2	128
  #define CIF_FLAGS_SINT8		256
  #define CIF_FLAGS_SINT16	512
  
  /* Perform machine dependent cif processing */
  ffi_status
  ffi_prep_cif_machdep (ffi_cif *cif)
  {
    /* Set the return type flag */
    switch (cif->rtype->type)
      {
      case FFI_TYPE_VOID:
        cif->flags = 0;
        break;
  
      case FFI_TYPE_STRUCT:
        if (cif->rtype->elements[0]->type == FFI_TYPE_STRUCT &&
            cif->rtype->elements[1])
          {
            cif->flags = 0;
            break;
          }
  
        switch (cif->rtype->size)
  	{
  	case 1:
  #ifdef __MINT__
  	  cif->flags = CIF_FLAGS_STRUCT2;
  #else
  	  cif->flags = CIF_FLAGS_STRUCT1;
  #endif
  	  break;
  	case 2:
  	  cif->flags = CIF_FLAGS_STRUCT2;
  	  break;
  #ifdef __MINT__
  	case 3:
  #endif
  	case 4:
  	  cif->flags = CIF_FLAGS_INT;
  	  break;
  #ifdef __MINT__
  	case 7:
  #endif
  	case 8:
  	  cif->flags = CIF_FLAGS_DINT;
  	  break;
  	default:
  	  cif->flags = 0;
  	  break;
  	}
        break;
  
      case FFI_TYPE_FLOAT:
        cif->flags = CIF_FLAGS_FLOAT;
        break;
  
      case FFI_TYPE_DOUBLE:
        cif->flags = CIF_FLAGS_DOUBLE;
        break;
  
  #if (FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE)
      case FFI_TYPE_LONGDOUBLE:
  #ifdef __MINT__
        cif->flags = 0;
  #else
        cif->flags = CIF_FLAGS_LDOUBLE;
  #endif
        break;
  #endif
  
      case FFI_TYPE_POINTER:
        cif->flags = CIF_FLAGS_POINTER;
        break;
  
      case FFI_TYPE_SINT64:
      case FFI_TYPE_UINT64:
        cif->flags = CIF_FLAGS_DINT;
        break;
  
      case FFI_TYPE_SINT16:
        cif->flags = CIF_FLAGS_SINT16;
        break;
  
      case FFI_TYPE_SINT8:
        cif->flags = CIF_FLAGS_SINT8;
        break;
  
      default:
        cif->flags = CIF_FLAGS_INT;
        break;
      }
  
    return FFI_OK;
  }
  
  void
  ffi_call (ffi_cif *cif, void (*fn) (), void *rvalue, void **avalue)
  {
    extended_cif ecif;
  
    ecif.cif = cif;
    ecif.avalue = avalue;
  
    /* If the return value is a struct and we don't have a return value
       address then we need to make one.  */
  
    if (rvalue == NULL
        && cif->rtype->type == FFI_TYPE_STRUCT
        && cif->rtype->size > 8)
      ecif.rvalue = alloca (cif->rtype->size);
    else
      ecif.rvalue = rvalue;
  
    switch (cif->abi)
      {
      case FFI_SYSV:
        ffi_call_SYSV (&ecif, cif->bytes, cif->flags,
  		     ecif.rvalue, fn);
        break;
  
      default:
        FFI_ASSERT (0);
        break;
      }
  }
  
  static void
  ffi_prep_incoming_args_SYSV (char *stack, void **avalue, ffi_cif *cif)
  {
    unsigned int i;
    void **p_argv;
    char *argp;
    ffi_type **p_arg;
  
    argp = stack;
    p_argv = avalue;
  
    for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
      {
        size_t z;
  
        z = (*p_arg)->size;
  #ifdef __MINT__
        if (cif->flags &&
            cif->rtype->type == FFI_TYPE_STRUCT &&
            (z == 1 || z == 2))
   	{
  	  *p_argv = (void *) (argp + 2);
  
  	  z = 4;
  	}
        else
        if (cif->flags &&
            cif->rtype->type == FFI_TYPE_STRUCT &&
            (z == 3 || z == 4))
   	{
  	  *p_argv = (void *) (argp);
  
  	  z = 4;
  	}
        else
  #endif
        if (z <= 4)
  	{
  	  *p_argv = (void *) (argp + 4 - z);
  
  	  z = 4;
  	}
        else
  	{
  	  *p_argv = (void *) argp;
  
  	  /* Align if necessary */
  	  if ((sizeof(int) - 1) & z)
  	    z = ALIGN(z, sizeof(int));
  	}
  
        p_argv++;
        argp += z;
      }
  }
  
  unsigned int
  ffi_closure_SYSV_inner (ffi_closure *closure, void *resp, void *args)
  {
    ffi_cif *cif;
    void **arg_area;
  
    cif = closure->cif;
    arg_area = (void**) alloca (cif->nargs * sizeof (void *));
  
    ffi_prep_incoming_args_SYSV(args, arg_area, cif);
  
    (closure->fun) (cif, resp, arg_area, closure->user_data);
  
    return cif->flags;
  }
  
  ffi_status
  ffi_prep_closure_loc (ffi_closure* closure,
  		      ffi_cif* cif,
  		      void (*fun)(ffi_cif*,void*,void**,void*),
  		      void *user_data,
  		      void *codeloc)
  {
    if (cif->abi != FFI_SYSV)
      return FFI_BAD_ABI;
  
    *(unsigned short *)closure->tramp = 0x207c;
    *(void **)(closure->tramp + 2) = codeloc;
    *(unsigned short *)(closure->tramp + 6) = 0x4ef9;
  
    if (
  #ifdef __MINT__
        (cif->rtype->type == FFI_TYPE_LONGDOUBLE) ||
  #endif
        (((cif->rtype->type == FFI_TYPE_STRUCT)
           && !cif->flags)))
      *(void **)(closure->tramp + 8) = ffi_closure_struct_SYSV;
    else
      *(void **)(closure->tramp + 8) = ffi_closure_SYSV;
  
  #ifdef __rtems__
    rtems_cache_flush_multiple_data_lines( codeloc, FFI_TRAMPOLINE_SIZE );
  #elif defined(__MINT__)
    Ssystem(S_FLUSHCACHE, codeloc, FFI_TRAMPOLINE_SIZE);
  #else
    syscall(SYS_cacheflush, codeloc, FLUSH_SCOPE_LINE,
  	  FLUSH_CACHE_BOTH, FFI_TRAMPOLINE_SIZE);
  #endif
  
    closure->cif  = cif;
    closure->user_data = user_data;
    closure->fun  = fun;
  
    return FFI_OK;
  }
  

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