text: /* -----------------------------------------------------------------------
     ffi.c - Copyright (c) 2003, 2004, 2006, 2007, 2012 Kaz Kojima
             Copyright (c) 2008 Anthony Green
     
     SuperH SHmedia 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 THE AUTHORS OR COPYRIGHT
     HOLDERS 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>
  
  #define NGREGARG 8
  #define NFREGARG 12
  
  static int
  return_type (ffi_type *arg)
  {
  
    if (arg->type != FFI_TYPE_STRUCT)
      return arg->type;
  
    /* gcc uses r2 if the result can be packed in on register.  */
    if (arg->size <= sizeof (UINT8))
      return FFI_TYPE_UINT8;
    else if (arg->size <= sizeof (UINT16))
      return FFI_TYPE_UINT16;
    else if (arg->size <= sizeof (UINT32))
      return FFI_TYPE_UINT32;
    else if (arg->size <= sizeof (UINT64))
      return FFI_TYPE_UINT64;
  
    return FFI_TYPE_STRUCT;
  }
  
  /* ffi_prep_args is called by the assembly routine once stack space
     has been allocated for the function's arguments */
  
  void ffi_prep_args(char *stack, extended_cif *ecif)
  {
    register unsigned int i;
    register unsigned int avn;
    register void **p_argv;
    register char *argp;
    register ffi_type **p_arg;
  
    argp = stack;
  
    if (return_type (ecif->cif->rtype) == FFI_TYPE_STRUCT)
      {
        *(void **) argp = ecif->rvalue;
        argp += sizeof (UINT64);
      }
  
    avn = ecif->cif->nargs;
    p_argv = ecif->avalue;
  
    for (i = 0, p_arg = ecif->cif->arg_types; i < avn; i++, p_arg++, p_argv++)
      {
        size_t z;
        int align;
  
        z = (*p_arg)->size;
        align = (*p_arg)->alignment;
        if (z < sizeof (UINT32))
  	{
  	  switch ((*p_arg)->type)
  	    {
  	    case FFI_TYPE_SINT8:
  	      *(SINT64 *) argp = (SINT64) *(SINT8 *)(*p_argv);
  	      break;
    
  	    case FFI_TYPE_UINT8:
  	      *(UINT64 *) argp = (UINT64) *(UINT8 *)(*p_argv);
  	      break;
    
  	    case FFI_TYPE_SINT16:
  	      *(SINT64 *) argp = (SINT64) *(SINT16 *)(*p_argv);
  	      break;
    
  	    case FFI_TYPE_UINT16:
  	      *(UINT64 *) argp = (UINT64) *(UINT16 *)(*p_argv);
  	      break;
    
  	    case FFI_TYPE_STRUCT:
  	      memcpy (argp, *p_argv, z);
  	      break;
  
  	    default:
  	      FFI_ASSERT(0);
  	    }
  	  argp += sizeof (UINT64);
  	}
        else if (z == sizeof (UINT32) && align == sizeof (UINT32))
  	{
  	  switch ((*p_arg)->type)
  	    {
  	    case FFI_TYPE_INT:
  	    case FFI_TYPE_SINT32:
  	      *(SINT64 *) argp = (SINT64) *(SINT32 *) (*p_argv);
  	      break;
  
  	    case FFI_TYPE_FLOAT:
  	    case FFI_TYPE_POINTER:
  	    case FFI_TYPE_UINT32:
  	    case FFI_TYPE_STRUCT:
  	      *(UINT64 *) argp = (UINT64) *(UINT32 *) (*p_argv);
  	      break;
  
  	    default:
  	      FFI_ASSERT(0);
  	      break;
  	    }
  	  argp += sizeof (UINT64);
  	}
        else if (z == sizeof (UINT64)
  	       && align == sizeof (UINT64)
  	       && ((int) *p_argv & (sizeof (UINT64) - 1)) == 0)
  	{
  	  *(UINT64 *) argp = *(UINT64 *) (*p_argv);
  	  argp += sizeof (UINT64);
  	}
        else
  	{
  	  int n = (z + sizeof (UINT64) - 1) / sizeof (UINT64);
  
  	  memcpy (argp, *p_argv, z);
  	  argp += n * sizeof (UINT64);
  	}
      }
  
    return;
  }
  
  /* Perform machine dependent cif processing */
  ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
  {
    int i, j;
    int size, type;
    int n, m;
    int greg;
    int freg;
    int fpair = -1;
  
    greg = (return_type (cif->rtype) == FFI_TYPE_STRUCT ? 1 : 0);
    freg = 0;
    cif->flags2 = 0;
  
    for (i = j = 0; i < cif->nargs; i++)
      {
        type = (cif->arg_types)[i]->type;
        switch (type)
  	{
  	case FFI_TYPE_FLOAT:
  	  greg++;
  	  cif->bytes += sizeof (UINT64) - sizeof (float);
  	  if (freg >= NFREGARG - 1)
  	    continue;
  	  if (fpair < 0)
  	    {
  	      fpair = freg;
  	      freg += 2;
  	    }
  	  else
  	    fpair = -1;
  	  cif->flags2 += ((cif->arg_types)[i]->type) << (2 * j++);
  	  break;
  
  	case FFI_TYPE_DOUBLE:
  	  if (greg++ >= NGREGARG && (freg + 1) >= NFREGARG)
  	    continue;
  	  if ((freg + 1) < NFREGARG)
  	    {
  	      freg += 2;
  	      cif->flags2 += ((cif->arg_types)[i]->type) << (2 * j++);
  	    }
  	  else
  	    cif->flags2 += FFI_TYPE_INT << (2 * j++);
  	  break;
  	      
  	default:
  	  size = (cif->arg_types)[i]->size;
  	  if (size < sizeof (UINT64))
  	    cif->bytes += sizeof (UINT64) - size;
  	  n = (size + sizeof (UINT64) - 1) / sizeof (UINT64);
  	  if (greg >= NGREGARG)
  	    continue;
  	  else if (greg + n - 1 >= NGREGARG)
  	    greg = NGREGARG;
  	  else
  	    greg += n;
  	  for (m = 0; m < n; m++)
  	    cif->flags2 += FFI_TYPE_INT << (2 * j++);
  	  break;
  	}
      }
  
    /* Set the return type flag */
    switch (cif->rtype->type)
      {
      case FFI_TYPE_STRUCT:
        cif->flags = return_type (cif->rtype);
        break;
  
      case FFI_TYPE_VOID:
      case FFI_TYPE_FLOAT:
      case FFI_TYPE_DOUBLE:
      case FFI_TYPE_SINT64:
      case FFI_TYPE_UINT64:
        cif->flags = cif->rtype->type;
        break;
  
      default:
        cif->flags = FFI_TYPE_INT;
        break;
      }
  
    return FFI_OK;
  }
  
  /*@-declundef@*/
  /*@-exportheader@*/
  extern void ffi_call_SYSV(void (*)(char *, extended_cif *), 
  			  /*@out@*/ extended_cif *, 
  			  unsigned, unsigned, long long,
  			  /*@out@*/ unsigned *, 
  			  void (*fn)(void));
  /*@=declundef@*/
  /*@=exportheader@*/
  
  void ffi_call(/*@dependent@*/ ffi_cif *cif, 
  	      void (*fn)(void), 
  	      /*@out@*/ void *rvalue, 
  	      /*@dependent@*/ void **avalue)
  {
    extended_cif ecif;
    UINT64 trvalue;
  
    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 (cif->rtype->type == FFI_TYPE_STRUCT
        && return_type (cif->rtype) != FFI_TYPE_STRUCT)
      ecif.rvalue = &trvalue;
    else if ((rvalue == NULL) && 
        (cif->rtype->type == FFI_TYPE_STRUCT))
      {
        ecif.rvalue = alloca(cif->rtype->size);
      }
    else
      ecif.rvalue = rvalue;
  
    switch (cif->abi) 
      {
      case FFI_SYSV:
        ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, cif->flags2,
  		    ecif.rvalue, fn);
        break;
      default:
        FFI_ASSERT(0);
        break;
      }
  
    if (rvalue
        && cif->rtype->type == FFI_TYPE_STRUCT
        && return_type (cif->rtype) != FFI_TYPE_STRUCT)
      memcpy (rvalue, &trvalue, cif->rtype->size);
  }
  
  extern void ffi_closure_SYSV (void);
  extern void __ic_invalidate (void *line);
  
  ffi_status
  ffi_prep_closure_loc (ffi_closure *closure,
  		      ffi_cif *cif,
  		      void (*fun)(ffi_cif*, void*, void**, void*),
  		      void *user_data,
  		      void *codeloc)
  {
    unsigned int *tramp;
  
    if (cif->abi != FFI_SYSV)
      return FFI_BAD_ABI;
  
    tramp = (unsigned int *) &closure->tramp[0];
    /* Since ffi_closure is an aligned object, the ffi trampoline is
       called as an SHcompact code.  Sigh.
       SHcompact part:
       mova @(1,pc),r0; add #1,r0; jmp @r0; nop;
       SHmedia part:
       movi fnaddr >> 16,r1; shori fnaddr,r1; ptabs/l r1,tr0
       movi cxt >> 16,r1; shori cxt,r1; blink tr0,r63  */
  #ifdef __LITTLE_ENDIAN__
    tramp[0] = 0x7001c701;
    tramp[1] = 0x0009402b;
  #else
    tramp[0] = 0xc7017001;
    tramp[1] = 0x402b0009;
  #endif
    tramp[2] = 0xcc000010 | (((UINT32) ffi_closure_SYSV) >> 16) << 10;
    tramp[3] = 0xc8000010 | (((UINT32) ffi_closure_SYSV) & 0xffff) << 10;
    tramp[4] = 0x6bf10600;
    tramp[5] = 0xcc000010 | (((UINT32) codeloc) >> 16) << 10;
    tramp[6] = 0xc8000010 | (((UINT32) codeloc) & 0xffff) << 10;
    tramp[7] = 0x4401fff0;
  
    closure->cif = cif;
    closure->fun = fun;
    closure->user_data = user_data;
  
    /* Flush the icache.  */
    asm volatile ("ocbwb %0,0; synco; icbi %1,0; synci" : : "r" (tramp),
  		"r"(codeloc));
  
    return FFI_OK;
  }
  
  /* Basically the trampoline invokes ffi_closure_SYSV, and on 
   * entry, r3 holds the address of the closure.
   * After storing the registers that could possibly contain
   * parameters to be passed into the stack frame and setting
   * up space for a return value, ffi_closure_SYSV invokes the 
   * following helper function to do most of the work.
   */
  
  int
  ffi_closure_helper_SYSV (ffi_closure *closure, UINT64 *rvalue, 
  			 UINT64 *pgr, UINT64 *pfr, UINT64 *pst)
  {
    void **avalue;
    ffi_type **p_arg;
    int i, avn;
    int greg, freg;
    ffi_cif *cif;
    int fpair = -1;
  
    cif = closure->cif;
    avalue = alloca (cif->nargs * sizeof (void *));
  
    /* Copy the caller's structure return value address so that the closure
       returns the data directly to the caller.  */
    if (return_type (cif->rtype) == FFI_TYPE_STRUCT)
      {
        rvalue = (UINT64 *) *pgr;
        greg = 1;
      }
    else
      greg = 0;
  
    freg = 0;
    cif = closure->cif;
    avn = cif->nargs;
  
    /* Grab the addresses of the arguments from the stack frame.  */
    for (i = 0, p_arg = cif->arg_types; i < avn; i++, p_arg++)
      {
        size_t z;
        void *p;
  
        z = (*p_arg)->size;
        if (z < sizeof (UINT32))
  	{
  	  p = pgr + greg++;
  
  	  switch ((*p_arg)->type)
  	    {
  	    case FFI_TYPE_SINT8:
  	    case FFI_TYPE_UINT8:
  	    case FFI_TYPE_SINT16:
  	    case FFI_TYPE_UINT16:
  	    case FFI_TYPE_STRUCT:
  #ifdef __LITTLE_ENDIAN__
  	      avalue[i] = p;
  #else
  	      avalue[i] = ((char *) p) + sizeof (UINT32) - z;
  #endif
  	      break;
  
  	    default:
  	      FFI_ASSERT(0);
  	    }
  	}
        else if (z == sizeof (UINT32))
  	{
  	  if ((*p_arg)->type == FFI_TYPE_FLOAT)
  	    {
  	      if (freg < NFREGARG - 1)
  		{
  		  if (fpair >= 0)
  		    {
  		      avalue[i] = (UINT32 *) pfr + fpair;
  		      fpair = -1;
  		    }
  		  else
  		    {
  #ifdef __LITTLE_ENDIAN__
  		      fpair = freg;
  		      avalue[i] = (UINT32 *) pfr + (1 ^ freg);
  #else
  		      fpair = 1 ^ freg;
  		      avalue[i] = (UINT32 *) pfr + freg;
  #endif
  		      freg += 2;
  		    }
  		}
  	      else
  #ifdef __LITTLE_ENDIAN__
  		avalue[i] = pgr + greg;
  #else
  		avalue[i] = (UINT32 *) (pgr + greg) + 1;
  #endif
  	    }
  	  else
  #ifdef __LITTLE_ENDIAN__
  	    avalue[i] = pgr + greg;
  #else
  	    avalue[i] = (UINT32 *) (pgr + greg) + 1;
  #endif
  	  greg++;
  	}
        else if ((*p_arg)->type == FFI_TYPE_DOUBLE)
  	{
  	  if (freg + 1 >= NFREGARG)
  	    avalue[i] = pgr + greg;
  	  else
  	    {
  	      avalue[i] = pfr + (freg >> 1);
  	      freg += 2;
  	    }
  	  greg++;
  	}
        else
  	{
  	  int n = (z + sizeof (UINT64) - 1) / sizeof (UINT64);
  
  	  avalue[i] = pgr + greg;
  	  greg += n;
  	}
      }
  
    (closure->fun) (cif, rvalue, avalue, closure->user_data);
  
    /* Tell ffi_closure_SYSV how to perform return type promotions.  */
    return return_type (cif->rtype);
  }
  
  