libffi/src/mips/ffi.c - gcc - Git at Google

 /* -----------------------------------------------------------------------
    ffi.c - Copyright (c) 1996 Red Hat, Inc.

    MIPS Foreign Function Interface

    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files (the
    ``Software''), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
    ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS IN THE SOFTWARE.
    ----------------------------------------------------------------------- */

 #include <ffi.h>
 #include <ffi_common.h>

 #include <stdlib.h>

 #if _MIPS_SIM == _ABIN32
 #define FIX_ARGP \
 FFI_ASSERT(argp <= &stack[bytes]); \
 if (argp == &stack[bytes]) \
 { \
   argp = stack; \
   ffi_stop_here(); \
 }
 #else
 #define FIX_ARGP
 #endif


 /* ffi_prep_args is called by the assembly routine once stack space
    has been allocated for the function's arguments */

 static void ffi_prep_args(char *stack,
 			  extended_cif *ecif,
 			  int bytes,
 			  int flags)
 {
   register int i;
   register void **p_argv;
   register char *argp;
   register ffi_type **p_arg;

 #if _MIPS_SIM == _ABIN32
   /* If more than 8 double words are used, the remainder go
      on the stack. We reorder stuff on the stack here to
      support this easily. */
   if (bytes > 8 * FFI_SIZEOF_ARG)
     argp = &stack[bytes - (8 * FFI_SIZEOF_ARG)];
   else
     argp = stack;
 #else
   argp = stack;
 #endif

   memset(stack, 0, bytes);

 #if _MIPS_SIM == _ABIN32
   if ( ecif->cif->rstruct_flag != 0 )
 #else
   if ( ecif->cif->rtype->type == FFI_TYPE_STRUCT )
 #endif
     {
       *(ffi_arg *) argp = (ffi_arg) ecif->rvalue;
       argp += sizeof(ffi_arg);
       FIX_ARGP;
     }

   p_argv = ecif->avalue;

   for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; i; i--, p_arg++)
     {
       size_t z;

       /* Align if necessary */
       if (((*p_arg)->alignment - 1) & (unsigned) argp) {
 	argp = (char *) ALIGN(argp, (*p_arg)->alignment);
 	FIX_ARGP;
       }

 #if _MIPS_SIM == _ABIO32
 #define OFFSET 0
 #else
 #define OFFSET sizeof(int)
 #endif

 	  z = (*p_arg)->size;
 	  if (z < sizeof(ffi_arg))
 	    {
 	      z = sizeof(ffi_arg);

 	      switch ((*p_arg)->type)
 		{
 		case FFI_TYPE_SINT8:
 		  *(SINT32 *) &argp[OFFSET] = (SINT32)*(SINT8 *)(* p_argv);
 		  break;

 		case FFI_TYPE_UINT8:
 		  *(UINT32 *) &argp[OFFSET] = (UINT32)*(UINT8 *)(* p_argv);
 		  break;

 		case FFI_TYPE_SINT16:
 		  *(SINT32 *) &argp[OFFSET] = (SINT32)*(SINT16 *)(* p_argv);
 		  break;

 		case FFI_TYPE_UINT16:
 		  *(UINT32 *) &argp[OFFSET] = (UINT32)*(UINT16 *)(* p_argv);
 		  break;

 		case FFI_TYPE_SINT32:
 		  *(SINT32 *) &argp[OFFSET] = (SINT32)*(SINT32 *)(* p_argv);
 		  break;

 		case FFI_TYPE_UINT32:
 		case FFI_TYPE_POINTER:
 		  *(UINT32 *) &argp[OFFSET] = (UINT32)*(UINT32 *)(* p_argv);
 		  break;

 		  /* This can only happen with 64bit slots */
 		case FFI_TYPE_FLOAT:
 		  *(float *) argp = *(float *)(* p_argv);
 		  break;

 		  /* Handle small structures */
 		case FFI_TYPE_STRUCT:
 		  memcpy(argp, *p_argv, (*p_arg)->size);
 		  break;

 		default:
 		  FFI_ASSERT(0);
 		}
 	    }
 	  else
 	    {
 #if _MIPS_SIM == _ABIO32
 	      memcpy(argp, *p_argv, z);
 #else
 	      {
 		unsigned end = (unsigned) argp+z;
 		unsigned cap = (unsigned) stack+bytes;

 		/* Check if the data will fit within the register
 		   space. Handle it if it doesn't. */

 		if (end <= cap)
 		  memcpy(argp, *p_argv, z);
 		else
 		  {
 		    unsigned portion = end - cap;

 		    memcpy(argp, *p_argv, portion);
 		    argp = stack;
 		    memcpy(argp,
 			   (void*)((unsigned)(*p_argv)+portion), z - portion);
 		  }
 	      }
 #endif
 	    }
 	  p_argv++;
 	  argp += z;
 	  FIX_ARGP;
     }

   return;
 }

 #if _MIPS_SIM == _ABIN32

 /* The n32 spec says that if "a chunk consists solely of a double
    float field (but not a double, which is part of a union), it
    is passed in a floating point register. Any other chunk is
    passed in an integer register". This code traverses structure
    definitions and generates the appropriate flags. */

 unsigned calc_n32_struct_flags(ffi_type *arg, unsigned *shift)
 {
   unsigned flags = 0;
   unsigned index = 0;

   ffi_type *e;

   while (e = arg->elements[index])
     {
       if (e->type == FFI_TYPE_DOUBLE)
 	{
 	  flags += (FFI_TYPE_DOUBLE << *shift);
 	  *shift += FFI_FLAG_BITS;
 	}
       else if (e->type == FFI_TYPE_STRUCT)
 	  flags += calc_n32_struct_flags(e, shift);
       else
 	*shift += FFI_FLAG_BITS;

       index++;
     }

   return flags;
 }

 unsigned calc_n32_return_struct_flags(ffi_type *arg)
 {
   unsigned flags = 0;
   unsigned index = 0;
   unsigned small = FFI_TYPE_SMALLSTRUCT;
   ffi_type *e;

   /* Returning structures under n32 is a tricky thing.
      A struct with only one or two floating point fields
      is returned in $f0 (and $f2 if necessary). Any other
      struct results at most 128 bits are returned in $2
      (the first 64 bits) and $3 (remainder, if necessary).
      Larger structs are handled normally. */

   if (arg->size > 16)
     return 0;

   if (arg->size > 8)
     small = FFI_TYPE_SMALLSTRUCT2;

   e = arg->elements[0];
   if (e->type == FFI_TYPE_DOUBLE)
     flags = FFI_TYPE_DOUBLE << FFI_FLAG_BITS;
   else if (e->type == FFI_TYPE_FLOAT)
     flags = FFI_TYPE_FLOAT << FFI_FLAG_BITS;

   if (flags && (e = arg->elements[1]))
     {
       if (e->type == FFI_TYPE_DOUBLE)
 	flags += FFI_TYPE_DOUBLE;
       else if (e->type == FFI_TYPE_FLOAT)
 	flags += FFI_TYPE_FLOAT;
       else
 	return small;

       if (flags && (arg->elements[2]))
 	{
 	  /* There are three arguments and the first two are
 	     floats! This must be passed the old way. */
 	  return small;
 	}
     }
   else
     if (!flags)
       return small;

   return flags;
 }

 #endif

 /* Perform machine dependent cif processing */
 ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
 {
   cif->flags = 0;

 #if _MIPS_SIM == _ABIO32
   /* Set the flags necessary for O32 processing */

   if (cif->rtype->type != FFI_TYPE_STRUCT)
     {
       if (cif->nargs > 0)
 	{
 	  switch ((cif->arg_types)[0]->type)
 	    {
 	    case FFI_TYPE_FLOAT:
 	    case FFI_TYPE_DOUBLE:
 	      cif->flags += (cif->arg_types)[0]->type;
 	      break;

 	    default:
 	      break;
 	    }

 	  if (cif->nargs > 1)
 	    {
 	      /* Only handle the second argument if the first
 		 is a float or double. */
 	      if (cif->flags)
 		{
 		  switch ((cif->arg_types)[1]->type)
 		    {
 		    case FFI_TYPE_FLOAT:
 		    case FFI_TYPE_DOUBLE:
 		      cif->flags += (cif->arg_types)[1]->type << FFI_FLAG_BITS;
 		      break;

 		    default:
 		      break;
 		    }
 		}
 	    }
 	}
     }

   /* Set the return type flag */
   switch (cif->rtype->type)
     {
     case FFI_TYPE_VOID:
     case FFI_TYPE_STRUCT:
     case FFI_TYPE_FLOAT:
     case FFI_TYPE_DOUBLE:
       cif->flags += cif->rtype->type << (FFI_FLAG_BITS * 2);
       break;

     default:
       cif->flags += FFI_TYPE_INT << (FFI_FLAG_BITS * 2);
       break;
     }
 #endif

 #if _MIPS_SIM == _ABIN32
   /* Set the flags necessary for N32 processing */
   {
     unsigned shift = 0;
     unsigned count = (cif->nargs < 8) ? cif->nargs : 8;
     unsigned index = 0;

     unsigned struct_flags = 0;

     if (cif->rtype->type == FFI_TYPE_STRUCT)
       {
 	struct_flags = calc_n32_return_struct_flags(cif->rtype);

 	if (struct_flags == 0)
 	  {
 	    /* This means that the structure is being passed as
 	       a hidden argument */

 	    shift = FFI_FLAG_BITS;
 	    count = (cif->nargs < 7) ? cif->nargs : 7;

 	    cif->rstruct_flag = !0;
 	  }
 	else
 	    cif->rstruct_flag = 0;
       }
     else
       cif->rstruct_flag = 0;

     while (count-- > 0)
       {
 	switch ((cif->arg_types)[index]->type)
 	  {
 	  case FFI_TYPE_FLOAT:
 	  case FFI_TYPE_DOUBLE:
 	    cif->flags += ((cif->arg_types)[index]->type << shift);
 	    shift += FFI_FLAG_BITS;
 	    break;

 	  case FFI_TYPE_STRUCT:
 	    cif->flags += calc_n32_struct_flags((cif->arg_types)[index],
 						&shift);
 	    break;

 	  default:
 	    shift += FFI_FLAG_BITS;
 	  }

 	index++;
       }

   /* Set the return type flag */
     switch (cif->rtype->type)
       {
       case FFI_TYPE_STRUCT:
 	{
 	  if (struct_flags == 0)
 	    {
 	      /* The structure is returned through a hidden
 		 first argument. Do nothing, 'cause FFI_TYPE_VOID
 		 is 0 */
 	    }
 	  else
 	    {
 	      /* The structure is returned via some tricky
 		 mechanism */
 	      cif->flags += FFI_TYPE_STRUCT << (FFI_FLAG_BITS * 8);
 	      cif->flags += struct_flags << (4 + (FFI_FLAG_BITS * 8));
 	    }
 	  break;
 	}

       case FFI_TYPE_VOID:
 	/* Do nothing, 'cause FFI_TYPE_VOID is 0 */
 	break;

       case FFI_TYPE_FLOAT:
       case FFI_TYPE_DOUBLE:
 	cif->flags += cif->rtype->type << (FFI_FLAG_BITS * 8);
 	break;

       default:
 	cif->flags += FFI_TYPE_INT << (FFI_FLAG_BITS * 8);
 	break;
       }
   }
 #endif

   return FFI_OK;
 }

 /* Low level routine for calling O32 functions */
 extern int ffi_call_O32(void (*)(char *, extended_cif *, int, int),
 			extended_cif *, unsigned,
 			unsigned, unsigned *, void (*)());

 /* Low level routine for calling N32 functions */
 extern int ffi_call_N32(void (*)(char *, extended_cif *, int, int),
 			extended_cif *, unsigned,
 			unsigned, unsigned *, void (*)());

 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))
     ecif.rvalue = alloca(cif->rtype->size);
   else
     ecif.rvalue = rvalue;

   switch (cif->abi)
     {
 #if _MIPS_SIM == _ABIO32
     case FFI_O32:
       ffi_call_O32(ffi_prep_args, &ecif, cif->bytes,
 		   cif->flags, ecif.rvalue, fn);
       break;
 #endif

 #if _MIPS_SIM == _ABIN32
     case FFI_N32:
       ffi_call_N32(ffi_prep_args, &ecif, cif->bytes,
 		   cif->flags, ecif.rvalue, fn);
       break;
 #endif

     default:
       FFI_ASSERT(0);
       break;
     }
 }
	/* -----------------------------------------------------------------------
	ffi.c - Copyright (c) 1996 Red Hat, Inc.

	MIPS Foreign Function Interface

	Permission is hereby granted, free of charge, to any person obtaining
	a copy of this software and associated documentation files (the
	``Software''), to deal in the Software without restriction, including
	without limitation the rights to use, copy, modify, merge, publish,
	distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so, subject to
	the following conditions:

	The above copyright notice and this permission notice shall be included
	in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	OTHER DEALINGS IN THE SOFTWARE.
	----------------------------------------------------------------------- */

	#include <ffi.h>
	#include <ffi_common.h>

	#include <stdlib.h>

	#if _MIPS_SIM == _ABIN32
	#define FIX_ARGP \
	FFI_ASSERT(argp <= &stack[bytes]); \
	if (argp == &stack[bytes]) \
	{ \
	argp = stack; \
	ffi_stop_here(); \
	}
	#else
	#define FIX_ARGP
	#endif


	/* ffi_prep_args is called by the assembly routine once stack space
	has been allocated for the function's arguments */

	static void ffi_prep_args(char *stack,
	extended_cif *ecif,
	int bytes,
	int flags)
	{
	register int i;
	register void **p_argv;
	register char *argp;
	register ffi_type **p_arg;

	#if _MIPS_SIM == _ABIN32
	/* If more than 8 double words are used, the remainder go
	on the stack. We reorder stuff on the stack here to
	support this easily. */
	if (bytes > 8 * FFI_SIZEOF_ARG)
	argp = &stack[bytes - (8 * FFI_SIZEOF_ARG)];
	else
	argp = stack;
	#else
	argp = stack;
	#endif

	memset(stack, 0, bytes);

	#if _MIPS_SIM == _ABIN32
	if ( ecif->cif->rstruct_flag != 0 )
	#else
	if ( ecif->cif->rtype->type == FFI_TYPE_STRUCT )
	#endif
	{
	(ffi_arg ) argp = (ffi_arg) ecif->rvalue;
	argp += sizeof(ffi_arg);
	FIX_ARGP;
	}

	p_argv = ecif->avalue;

	for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; i; i--, p_arg++)
	{
	size_t z;

	/* Align if necessary */
	if (((*p_arg)->alignment - 1) & (unsigned) argp) {
	argp = (char ) ALIGN(argp, (p_arg)->alignment);
	FIX_ARGP;
	}

	#if _MIPS_SIM == _ABIO32
	#define OFFSET 0
	#else
	#define OFFSET sizeof(int)
	#endif

	z = (*p_arg)->size;
	if (z < sizeof(ffi_arg))
	{
	z = sizeof(ffi_arg);

	switch ((*p_arg)->type)
	{
	case FFI_TYPE_SINT8:
	(SINT32 ) &argp[OFFSET] = (SINT32)(SINT8 )(* p_argv);
	break;

	case FFI_TYPE_UINT8:
	(UINT32 ) &argp[OFFSET] = (UINT32)(UINT8 )(* p_argv);
	break;

	case FFI_TYPE_SINT16:
	(SINT32 ) &argp[OFFSET] = (SINT32)(SINT16 )(* p_argv);
	break;

	case FFI_TYPE_UINT16:
	(UINT32 ) &argp[OFFSET] = (UINT32)(UINT16 )(* p_argv);
	break;

	case FFI_TYPE_SINT32:
	(SINT32 ) &argp[OFFSET] = (SINT32)(SINT32 )(* p_argv);
	break;

	case FFI_TYPE_UINT32:
	case FFI_TYPE_POINTER:
	(UINT32 ) &argp[OFFSET] = (UINT32)(UINT32 )(* p_argv);
	break;

	/* This can only happen with 64bit slots */
	case FFI_TYPE_FLOAT:
	(float ) argp = (float )(* p_argv);
	break;

	/* Handle small structures */
	case FFI_TYPE_STRUCT:
	memcpy(argp, p_argv, (p_arg)->size);
	break;

	default:
	FFI_ASSERT(0);
	}
	}
	else
	{
	#if _MIPS_SIM == _ABIO32
	memcpy(argp, *p_argv, z);
	#else
	{
	unsigned end = (unsigned) argp+z;
	unsigned cap = (unsigned) stack+bytes;

	/* Check if the data will fit within the register
	space. Handle it if it doesn't. */

	if (end <= cap)
	memcpy(argp, *p_argv, z);
	else
	{
	unsigned portion = end - cap;

	memcpy(argp, *p_argv, portion);
	argp = stack;
	memcpy(argp,
	(void)((unsigned)(p_argv)+portion), z - portion);
	}
	}
	#endif
	}
	p_argv++;
	argp += z;
	FIX_ARGP;
	}

	return;
	}

	#if _MIPS_SIM == _ABIN32

	/* The n32 spec says that if "a chunk consists solely of a double
	float field (but not a double, which is part of a union), it
	is passed in a floating point register. Any other chunk is
	passed in an integer register". This code traverses structure
	definitions and generates the appropriate flags. */

	unsigned calc_n32_struct_flags(ffi_type arg, unsigned shift)
	{
	unsigned flags = 0;
	unsigned index = 0;

	ffi_type *e;

	while (e = arg->elements[index])
	{
	if (e->type == FFI_TYPE_DOUBLE)
	{
	flags += (FFI_TYPE_DOUBLE << *shift);
	*shift += FFI_FLAG_BITS;
	}
	else if (e->type == FFI_TYPE_STRUCT)
	flags += calc_n32_struct_flags(e, shift);
	else
	*shift += FFI_FLAG_BITS;

	index++;
	}

	return flags;
	}

	unsigned calc_n32_return_struct_flags(ffi_type *arg)
	{
	unsigned flags = 0;
	unsigned index = 0;
	unsigned small = FFI_TYPE_SMALLSTRUCT;
	ffi_type *e;

	/* Returning structures under n32 is a tricky thing.
	A struct with only one or two floating point fields
	is returned in $f0 (and $f2 if necessary). Any other
	struct results at most 128 bits are returned in $2
	(the first 64 bits) and $3 (remainder, if necessary).
	Larger structs are handled normally. */

	if (arg->size > 16)
	return 0;

	if (arg->size > 8)
	small = FFI_TYPE_SMALLSTRUCT2;

	e = arg->elements[0];
	if (e->type == FFI_TYPE_DOUBLE)
	flags = FFI_TYPE_DOUBLE << FFI_FLAG_BITS;
	else if (e->type == FFI_TYPE_FLOAT)
	flags = FFI_TYPE_FLOAT << FFI_FLAG_BITS;

	if (flags && (e = arg->elements[1]))
	{
	if (e->type == FFI_TYPE_DOUBLE)
	flags += FFI_TYPE_DOUBLE;
	else if (e->type == FFI_TYPE_FLOAT)
	flags += FFI_TYPE_FLOAT;
	else
	return small;

	if (flags && (arg->elements[2]))
	{
	/* There are three arguments and the first two are
	floats! This must be passed the old way. */
	return small;
	}
	}
	else
	if (!flags)
	return small;

	return flags;
	}

	#endif

	/* Perform machine dependent cif processing */
	ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
	{
	cif->flags = 0;

	#if _MIPS_SIM == _ABIO32
	/* Set the flags necessary for O32 processing */

	if (cif->rtype->type != FFI_TYPE_STRUCT)
	{
	if (cif->nargs > 0)
	{
	switch ((cif->arg_types)[0]->type)
	{
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	cif->flags += (cif->arg_types)[0]->type;
	break;

	default:
	break;
	}

	if (cif->nargs > 1)
	{
	/* Only handle the second argument if the first
	is a float or double. */
	if (cif->flags)
	{
	switch ((cif->arg_types)[1]->type)
	{
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	cif->flags += (cif->arg_types)[1]->type << FFI_FLAG_BITS;
	break;

	default:
	break;
	}
	}
	}
	}
	}

	/* Set the return type flag */
	switch (cif->rtype->type)
	{
	case FFI_TYPE_VOID:
	case FFI_TYPE_STRUCT:
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	cif->flags += cif->rtype->type << (FFI_FLAG_BITS * 2);
	break;

	default:
	cif->flags += FFI_TYPE_INT << (FFI_FLAG_BITS * 2);
	break;
	}
	#endif

	#if _MIPS_SIM == _ABIN32
	/* Set the flags necessary for N32 processing */
	{
	unsigned shift = 0;
	unsigned count = (cif->nargs < 8) ? cif->nargs : 8;
	unsigned index = 0;

	unsigned struct_flags = 0;

	if (cif->rtype->type == FFI_TYPE_STRUCT)
	{
	struct_flags = calc_n32_return_struct_flags(cif->rtype);

	if (struct_flags == 0)
	{
	/* This means that the structure is being passed as
	a hidden argument */

	shift = FFI_FLAG_BITS;
	count = (cif->nargs < 7) ? cif->nargs : 7;

	cif->rstruct_flag = !0;
	}
	else
	cif->rstruct_flag = 0;
	}
	else
	cif->rstruct_flag = 0;

	while (count-- > 0)
	{
	switch ((cif->arg_types)[index]->type)
	{
	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	cif->flags += ((cif->arg_types)[index]->type << shift);
	shift += FFI_FLAG_BITS;
	break;

	case FFI_TYPE_STRUCT:
	cif->flags += calc_n32_struct_flags((cif->arg_types)[index],
	&shift);
	break;

	default:
	shift += FFI_FLAG_BITS;
	}

	index++;
	}

	/* Set the return type flag */
	switch (cif->rtype->type)
	{
	case FFI_TYPE_STRUCT:
	{
	if (struct_flags == 0)
	{
	/* The structure is returned through a hidden
	first argument. Do nothing, 'cause FFI_TYPE_VOID
	is 0 */
	}
	else
	{
	/* The structure is returned via some tricky
	mechanism */
	cif->flags += FFI_TYPE_STRUCT << (FFI_FLAG_BITS * 8);
	cif->flags += struct_flags << (4 + (FFI_FLAG_BITS * 8));
	}
	break;
	}

	case FFI_TYPE_VOID:
	/* Do nothing, 'cause FFI_TYPE_VOID is 0 */
	break;

	case FFI_TYPE_FLOAT:
	case FFI_TYPE_DOUBLE:
	cif->flags += cif->rtype->type << (FFI_FLAG_BITS * 8);
	break;

	default:
	cif->flags += FFI_TYPE_INT << (FFI_FLAG_BITS * 8);
	break;
	}
	}
	#endif

	return FFI_OK;
	}

	/* Low level routine for calling O32 functions */
	extern int ffi_call_O32(void ()(char , extended_cif *, int, int),
	extended_cif *, unsigned,
	unsigned, unsigned , void ()());

	/* Low level routine for calling N32 functions */
	extern int ffi_call_N32(void ()(char , extended_cif *, int, int),
	extended_cif *, unsigned,
	unsigned, unsigned , void ()());

	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))
	ecif.rvalue = alloca(cif->rtype->size);
	else
	ecif.rvalue = rvalue;

	switch (cif->abi)
	{
	#if _MIPS_SIM == _ABIO32
	case FFI_O32:
	ffi_call_O32(ffi_prep_args, &ecif, cif->bytes,
	cif->flags, ecif.rvalue, fn);
	break;
	#endif

	#if _MIPS_SIM == _ABIN32
	case FFI_N32:
	ffi_call_N32(ffi_prep_args, &ecif, cif->bytes,
	cif->flags, ecif.rvalue, fn);
	break;
	#endif

	default:
	FFI_ASSERT(0);
	break;
	}
	}