c3-lang/libffi/src/x86/ffi.c

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• Hash : d3695227
  Author :
  Date : 2014-04-20T12:03:25
  

  Support fastcall closures libffi on 32-bit x86 now supports closures for all supported ABIs. Thus, rewrite the last remaining duplicated-by-ABI test (closure_stdcall and closure_thiscall) to use the generic ABI_NUM/ABI_ATTR mechanism.

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• src/x86/ffi.c

• /* -----------------------------------------------------------------------
     ffi.c - Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008  Red Hat, Inc.
             Copyright (c) 2002  Ranjit Mathew
             Copyright (c) 2002  Bo Thorsen
             Copyright (c) 2002  Roger Sayle
             Copyright (C) 2008, 2010  Free Software Foundation, Inc.
  
     x86 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.
     ----------------------------------------------------------------------- */
  
  #if !defined(__x86_64__) || defined(_WIN64)
  
  #ifdef _WIN64
  #include <windows.h>
  #endif
  
  #include <ffi.h>
  #include <ffi_common.h>
  
  #include <stdlib.h>
  
  
  /* 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);
  void ffi_prep_args(char *stack, extended_cif *ecif)
  {
    register unsigned int i;
    register void **p_argv;
    register char *argp;
    register ffi_type **p_arg;
  #ifndef X86_WIN64
    size_t p_stack_args[2];
    void *p_stack_data[2];
    char *argp2 = stack;
    int stack_args_count = 0;
    int cabi = ecif->cif->abi;
  #endif
  
    argp = stack;
  
    if ((ecif->cif->flags == FFI_TYPE_STRUCT
         || ecif->cif->flags == FFI_TYPE_MS_STRUCT)
  #ifdef X86_WIN64
        && (ecif->cif->rtype->size != 1 && ecif->cif->rtype->size != 2
            && ecif->cif->rtype->size != 4 && ecif->cif->rtype->size != 8)
  #endif
        )
      {
        *(void **) argp = ecif->rvalue;
  #ifndef X86_WIN64
        /* For fastcall/thiscall this is first register-passed
           argument.  */
        if (cabi == FFI_THISCALL || cabi == FFI_FASTCALL)
  	{
  	  p_stack_args[stack_args_count] = sizeof (void*);
  	  p_stack_data[stack_args_count] = argp;
  	  ++stack_args_count;
  	}
  #endif
        argp += sizeof(void*);
      }
  
    p_argv = ecif->avalue;
  
    for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
         i != 0;
         i--, p_arg++)
      {
        size_t z;
  
        /* Align if necessary */
        if ((sizeof(void*) - 1) & (size_t) argp)
          argp = (char *) ALIGN(argp, sizeof(void*));
  
        z = (*p_arg)->size;
  #ifdef X86_WIN64
        if (z > sizeof(ffi_arg)
            || ((*p_arg)->type == FFI_TYPE_STRUCT
                && (z != 1 && z != 2 && z != 4 && z != 8))
  #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
            || ((*p_arg)->type == FFI_TYPE_LONGDOUBLE)
  #endif
            )
          {
            z = sizeof(ffi_arg);
            *(void **)argp = *p_argv;
          }
        else if ((*p_arg)->type == FFI_TYPE_FLOAT)
          {
            memcpy(argp, *p_argv, z);
          }
        else
  #endif
        if (z < sizeof(ffi_arg))
          {
            z = sizeof(ffi_arg);
            switch ((*p_arg)->type)
              {
              case FFI_TYPE_SINT8:
                *(ffi_sarg *) argp = (ffi_sarg)*(SINT8 *)(* p_argv);
                break;
  
              case FFI_TYPE_UINT8:
                *(ffi_arg *) argp = (ffi_arg)*(UINT8 *)(* p_argv);
                break;
  
              case FFI_TYPE_SINT16:
                *(ffi_sarg *) argp = (ffi_sarg)*(SINT16 *)(* p_argv);
                break;
  
              case FFI_TYPE_UINT16:
                *(ffi_arg *) argp = (ffi_arg)*(UINT16 *)(* p_argv);
                break;
  
              case FFI_TYPE_SINT32:
                *(ffi_sarg *) argp = (ffi_sarg)*(SINT32 *)(* p_argv);
                break;
  
              case FFI_TYPE_UINT32:
                *(ffi_arg *) argp = (ffi_arg)*(UINT32 *)(* p_argv);
                break;
  
              case FFI_TYPE_STRUCT:
                *(ffi_arg *) argp = *(ffi_arg *)(* p_argv);
                break;
  
              default:
                FFI_ASSERT(0);
              }
          }
        else
          {
            memcpy(argp, *p_argv, z);
          }
  
  #ifndef X86_WIN64
      /* For thiscall/fastcall convention register-passed arguments
         are the first two none-floating-point arguments with a size
         smaller or equal to sizeof (void*).  */
      if ((cabi == FFI_THISCALL && stack_args_count < 1)
          || (cabi == FFI_FASTCALL && stack_args_count < 2))
        {
  	if (z <= 4
  	    && ((*p_arg)->type != FFI_TYPE_FLOAT
  	        && (*p_arg)->type != FFI_TYPE_STRUCT))
  	  {
  	    p_stack_args[stack_args_count] = z;
  	    p_stack_data[stack_args_count] = argp;
  	    ++stack_args_count;
  	  }
        }
  #endif
        p_argv++;
  #ifdef X86_WIN64
        argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
  #else
        argp += z;
  #endif
      }
  
  #ifndef X86_WIN64
    /* We need to move the register-passed arguments for thiscall/fastcall
       on top of stack, so that those can be moved to registers ecx/edx by
       call-handler.  */
    if (stack_args_count > 0)
      {
        size_t zz = (p_stack_args[0] + 3) & ~3;
        char *h;
  
        /* Move first argument to top-stack position.  */
        if (p_stack_data[0] != argp2)
  	{
  	  h = alloca (zz + 1);
  	  memcpy (h, p_stack_data[0], zz);
  	  memmove (argp2 + zz, argp2,
  	           (size_t) ((char *) p_stack_data[0] - (char*)argp2));
  	  memcpy (argp2, h, zz);
  	}
  
        argp2 += zz;
        --stack_args_count;
        if (zz > 4)
  	stack_args_count = 0;
  
        /* If we have a second argument, then move it on top
           after the first one.  */
        if (stack_args_count > 0 && p_stack_data[1] != argp2)
  	{
  	  zz = p_stack_args[1];
  	  zz = (zz + 3) & ~3;
  	  h = alloca (zz + 1);
  	  h = alloca (zz + 1);
  	  memcpy (h, p_stack_data[1], zz);
  	  memmove (argp2 + zz, argp2, (size_t) ((char*) p_stack_data[1] - (char*)argp2));
  	  memcpy (argp2, h, zz);
  	}
      }
  #endif
    return;
  }
  
  /* Perform machine dependent cif processing */
  ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
  {
    unsigned int i;
    ffi_type **ptr;
  
    /* Set the return type flag */
    switch (cif->rtype->type)
      {
      case FFI_TYPE_VOID:
      case FFI_TYPE_UINT8:
      case FFI_TYPE_UINT16:
      case FFI_TYPE_SINT8:
      case FFI_TYPE_SINT16:
  #ifdef X86_WIN64
      case FFI_TYPE_UINT32:
      case FFI_TYPE_SINT32:
  #endif
      case FFI_TYPE_SINT64:
      case FFI_TYPE_FLOAT:
      case FFI_TYPE_DOUBLE:
  #ifndef X86_WIN64
  #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
      case FFI_TYPE_LONGDOUBLE:
  #endif
  #endif
        cif->flags = (unsigned) cif->rtype->type;
        break;
  
      case FFI_TYPE_UINT64:
  #ifdef X86_WIN64
      case FFI_TYPE_POINTER:
  #endif
        cif->flags = FFI_TYPE_SINT64;
        break;
  
      case FFI_TYPE_STRUCT:
  #ifndef X86
        if (cif->rtype->size == 1)
          {
            cif->flags = FFI_TYPE_SMALL_STRUCT_1B; /* same as char size */
          }
        else if (cif->rtype->size == 2)
          {
            cif->flags = FFI_TYPE_SMALL_STRUCT_2B; /* same as short size */
          }
        else if (cif->rtype->size == 4)
          {
  #ifdef X86_WIN64
            cif->flags = FFI_TYPE_SMALL_STRUCT_4B;
  #else
            cif->flags = FFI_TYPE_INT; /* same as int type */
  #endif
          }
        else if (cif->rtype->size == 8)
          {
            cif->flags = FFI_TYPE_SINT64; /* same as int64 type */
          }
        else
  #endif
          {
  #ifdef X86_WIN32
            if (cif->abi == FFI_MS_CDECL)
              cif->flags = FFI_TYPE_MS_STRUCT;
            else
  #endif
              cif->flags = FFI_TYPE_STRUCT;
            /* allocate space for return value pointer */
            cif->bytes += ALIGN(sizeof(void*), FFI_SIZEOF_ARG);
          }
        break;
  
      default:
  #ifdef X86_WIN64
        cif->flags = FFI_TYPE_SINT64;
        break;
      case FFI_TYPE_INT:
        cif->flags = FFI_TYPE_SINT32;
  #else
        cif->flags = FFI_TYPE_INT;
  #endif
        break;
      }
  
    for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
      {
        if (((*ptr)->alignment - 1) & cif->bytes)
          cif->bytes = ALIGN(cif->bytes, (*ptr)->alignment);
        cif->bytes += (unsigned)ALIGN((*ptr)->size, FFI_SIZEOF_ARG);
      }
  
  #ifdef X86_WIN64
    /* ensure space for storing four registers */
    cif->bytes += 4 * sizeof(ffi_arg);
  #endif
  
  #ifndef X86_WIN32
  #ifndef X86_WIN64
    if (cif->abi != FFI_STDCALL && cif->abi != FFI_THISCALL && cif->abi != FFI_FASTCALL)
  #endif
      cif->bytes = (cif->bytes + 15) & ~0xF;
  #endif
  
    return FFI_OK;
  }
  
  #ifdef X86_WIN64
  extern int
  ffi_call_win64(void (*)(char *, extended_cif *), extended_cif *,
                 unsigned, unsigned, unsigned *, void (*fn)(void));
  #else
  extern void
  ffi_call_win32(void (*)(char *, extended_cif *), extended_cif *,
                 unsigned, unsigned, unsigned, unsigned *, void (*fn)(void));
  extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
                            unsigned, unsigned, unsigned *, void (*fn)(void));
  #endif
  
  void ffi_call(ffi_cif *cif, void (*fn)(void), 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                     */
  
  #ifdef X86_WIN64
    if (rvalue == NULL
        && cif->flags == FFI_TYPE_STRUCT
        && cif->rtype->size != 1 && cif->rtype->size != 2
        && cif->rtype->size != 4 && cif->rtype->size != 8)
      {
        ecif.rvalue = alloca((cif->rtype->size + 0xF) & ~0xF);
      }
  #else
    if (rvalue == NULL
        && (cif->flags == FFI_TYPE_STRUCT
            || cif->flags == FFI_TYPE_MS_STRUCT))
      {
        ecif.rvalue = alloca(cif->rtype->size);
      }
  #endif
    else
      ecif.rvalue = rvalue;
      
    
    switch (cif->abi) 
      {
  #ifdef X86_WIN64
      case FFI_WIN64:
        ffi_call_win64(ffi_prep_args, &ecif, cif->bytes,
                       cif->flags, ecif.rvalue, fn);
        break;
  #else
  #ifndef X86_WIN32
      case FFI_SYSV:
        ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue,
                      fn);
        break;
  #else
      case FFI_SYSV:
      case FFI_MS_CDECL:
  #endif
      case FFI_STDCALL:
        ffi_call_win32(ffi_prep_args, &ecif, cif->abi, cif->bytes, cif->flags,
  		     ecif.rvalue, fn);
        break;
      case FFI_THISCALL:
      case FFI_FASTCALL:
        {
  	unsigned int abi = cif->abi;
  	unsigned int i, passed_regs = 0;
  
  	if (cif->flags == FFI_TYPE_STRUCT)
  	  ++passed_regs;
  
  	for (i=0; i < cif->nargs && passed_regs < 2;i++)
  	  {
  	    size_t sz;
  
  	    if (cif->arg_types[i]->type == FFI_TYPE_FLOAT
  	        || cif->arg_types[i]->type == FFI_TYPE_STRUCT)
  	      continue;
  	    sz = (cif->arg_types[i]->size + 3) & ~3;
  	    if (sz == 0 || sz > 4)
  	      continue;
  	    ++passed_regs;
  	  }
  	if (passed_regs < 2 && abi == FFI_FASTCALL)
  	  abi = FFI_THISCALL;
  	if (passed_regs < 1 && abi == FFI_THISCALL)
  	  abi = FFI_STDCALL;
          ffi_call_win32(ffi_prep_args, &ecif, abi, cif->bytes, cif->flags,
                         ecif.rvalue, fn);
        }
        break;
  #endif
      default:
        FFI_ASSERT(0);
        break;
      }
  }
  
  
  /** private members **/
  
  /* The following __attribute__((regparm(1))) decorations will have no effect
     on MSVC or SUNPRO_C -- standard conventions apply. */
  static void ffi_prep_incoming_args_SYSV (char *stack, void **ret,
                                           void** args, ffi_cif* cif);
  void FFI_HIDDEN ffi_closure_SYSV (ffi_closure *)
       __attribute__ ((regparm(1)));
  unsigned int FFI_HIDDEN ffi_closure_SYSV_inner (ffi_closure *, void **, void *)
       __attribute__ ((regparm(1)));
  void FFI_HIDDEN ffi_closure_raw_SYSV (ffi_raw_closure *)
       __attribute__ ((regparm(1)));
  #ifdef X86_WIN32
  void FFI_HIDDEN ffi_closure_raw_THISCALL (ffi_raw_closure *)
       __attribute__ ((regparm(1)));
  #endif
  #ifndef X86_WIN64
  void FFI_HIDDEN ffi_closure_STDCALL (ffi_closure *)
       __attribute__ ((regparm(1)));
  void FFI_HIDDEN ffi_closure_THISCALL (ffi_closure *)
       __attribute__ ((regparm(1)));
  void FFI_HIDDEN ffi_closure_FASTCALL (ffi_closure *)
       __attribute__ ((regparm(1)));
  #else
  void FFI_HIDDEN ffi_closure_win64 (ffi_closure *);
  #endif
  
  /* This function is jumped to by the trampoline */
  
  #ifdef X86_WIN64
  void * FFI_HIDDEN
  ffi_closure_win64_inner (ffi_closure *closure, void *args) {
    ffi_cif       *cif;
    void         **arg_area;
    void          *result;
    void          *resp = &result;
  
    cif         = closure->cif;
    arg_area    = (void**) alloca (cif->nargs * sizeof (void*));  
  
    /* this call will initialize ARG_AREA, such that each
     * element in that array points to the corresponding 
     * value on the stack; and if the function returns
     * a structure, it will change RESP to point to the
     * structure return address.  */
  
    ffi_prep_incoming_args_SYSV(args, &resp, arg_area, cif);
    
    (closure->fun) (cif, resp, arg_area, closure->user_data);
  
    /* The result is returned in rax.  This does the right thing for
       result types except for floats; we have to 'mov xmm0, rax' in the
       caller to correct this.
       TODO: structure sizes of 3 5 6 7 are returned by reference, too!!!
    */
    return cif->rtype->size > sizeof(void *) ? resp : *(void **)resp;
  }
  
  #else
  unsigned int FFI_HIDDEN __attribute__ ((regparm(1)))
  ffi_closure_SYSV_inner (ffi_closure *closure, void **respp, void *args)
  {
    /* our various things...  */
    ffi_cif       *cif;
    void         **arg_area;
  
    cif         = closure->cif;
    arg_area    = (void**) alloca (cif->nargs * sizeof (void*));  
  
    /* this call will initialize ARG_AREA, such that each
     * element in that array points to the corresponding 
     * value on the stack; and if the function returns
     * a structure, it will change RESP to point to the
     * structure return address.  */
  
    ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif);
  
    (closure->fun) (cif, *respp, arg_area, closure->user_data);
  
    return cif->flags;
  }
  #endif /* !X86_WIN64 */
  
  static void
  ffi_prep_incoming_args_SYSV(char *stack, void **rvalue, void **avalue,
                              ffi_cif *cif)
  {
    register unsigned int i;
    register void **p_argv;
    register char *argp;
    register ffi_type **p_arg;
  
    argp = stack;
  
  #ifdef X86_WIN64
    if (cif->rtype->size > sizeof(ffi_arg)
        || (cif->flags == FFI_TYPE_STRUCT
            && (cif->rtype->size != 1 && cif->rtype->size != 2
                && cif->rtype->size != 4 && cif->rtype->size != 8))) {
      *rvalue = *(void **) argp;
      argp += sizeof(void *);
    }
  #else
    if ( cif->flags == FFI_TYPE_STRUCT
         || cif->flags == FFI_TYPE_MS_STRUCT ) {
      *rvalue = *(void **) argp;
      argp += sizeof(void *);
    }
  #endif
  
    p_argv = avalue;
  
    for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++)
      {
        size_t z;
  
        /* Align if necessary */
        if ((sizeof(void*) - 1) & (size_t) argp) {
          argp = (char *) ALIGN(argp, sizeof(void*));
        }
  
  #ifdef X86_WIN64
        if ((*p_arg)->size > sizeof(ffi_arg)
            || ((*p_arg)->type == FFI_TYPE_STRUCT
                && ((*p_arg)->size != 1 && (*p_arg)->size != 2
                    && (*p_arg)->size != 4 && (*p_arg)->size != 8)))
          {
            z = sizeof(void *);
            *p_argv = *(void **)argp;
          }
        else
  #endif
          {
            z = (*p_arg)->size;
            
            /* because we're little endian, this is what it turns into.   */
            
            *p_argv = (void*) argp;
          }
            
        p_argv++;
  #ifdef X86_WIN64
        argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
  #else
        argp += z;
  #endif
      }
    
    return;
  }
  
  #define FFI_INIT_TRAMPOLINE_WIN64(TRAMP,FUN,CTX,MASK) \
  { unsigned char *__tramp = (unsigned char*)(TRAMP); \
     void*  __fun = (void*)(FUN); \
     void*  __ctx = (void*)(CTX); \
     *(unsigned char*) &__tramp[0] = 0x41; \
     *(unsigned char*) &__tramp[1] = 0xbb; \
     *(unsigned int*) &__tramp[2] = MASK; /* mov $mask, %r11 */ \
     *(unsigned char*) &__tramp[6] = 0x48; \
     *(unsigned char*) &__tramp[7] = 0xb8; \
     *(void**) &__tramp[8] = __ctx; /* mov __ctx, %rax */ \
     *(unsigned char *)  &__tramp[16] = 0x49; \
     *(unsigned char *)  &__tramp[17] = 0xba; \
     *(void**) &__tramp[18] = __fun; /* mov __fun, %r10 */ \
     *(unsigned char *)  &__tramp[26] = 0x41; \
     *(unsigned char *)  &__tramp[27] = 0xff; \
     *(unsigned char *)  &__tramp[28] = 0xe2; /* jmp %r10 */ \
   }
  
  /* How to make a trampoline.  Derived from gcc/config/i386/i386.c. */
  
  #define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX) \
  { unsigned char *__tramp = (unsigned char*)(TRAMP); \
     unsigned int  __fun = (unsigned int)(FUN); \
     unsigned int  __ctx = (unsigned int)(CTX); \
     unsigned int  __dis = __fun - (__ctx + 10);  \
     *(unsigned char*) &__tramp[0] = 0xb8; \
     *(unsigned int*)  &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
     *(unsigned char *)  &__tramp[5] = 0xe9; \
     *(unsigned int*)  &__tramp[6] = __dis; /* jmp __fun  */ \
   }
  
  #define FFI_INIT_TRAMPOLINE_RAW_THISCALL(TRAMP,FUN,CTX,SIZE) \
  { unsigned char *__tramp = (unsigned char*)(TRAMP); \
     unsigned int  __fun = (unsigned int)(FUN); \
     unsigned int  __ctx = (unsigned int)(CTX); \
     unsigned int  __dis = __fun - (__ctx + 49);  \
     unsigned short __size = (unsigned short)(SIZE); \
     *(unsigned int *) &__tramp[0] = 0x8324048b;	/* mov (%esp), %eax */ \
     *(unsigned int *) &__tramp[4] = 0x4c890cec;	/* sub $12, %esp */ \
     *(unsigned int *) &__tramp[8] = 0x04890424;	/* mov %ecx, 4(%esp) */ \
     *(unsigned char*) &__tramp[12] = 0x24;	/* mov %eax, (%esp) */ \
     *(unsigned char*) &__tramp[13] = 0xb8; \
     *(unsigned int *) &__tramp[14] = __size;	/* mov __size, %eax */ \
     *(unsigned int *) &__tramp[18] = 0x08244c8d;	/* lea 8(%esp), %ecx */ \
     *(unsigned int *) &__tramp[22] = 0x4802e8c1; /* shr $2, %eax ; dec %eax */ \
     *(unsigned short*) &__tramp[26] = 0x0b74;	/* jz 1f */ \
     *(unsigned int *) &__tramp[28] = 0x8908518b;	/* 2b: mov 8(%ecx), %edx */ \
     *(unsigned int *) &__tramp[32] = 0x04c18311; /* mov %edx, (%ecx) ; add $4, %ecx */ \
     *(unsigned char*) &__tramp[36] = 0x48;	/* dec %eax */ \
     *(unsigned short*) &__tramp[37] = 0xf575;	/* jnz 2b ; 1f: */ \
     *(unsigned char*) &__tramp[39] = 0xb8; \
     *(unsigned int*)  &__tramp[40] = __ctx; /* movl __ctx, %eax */ \
     *(unsigned char *)  &__tramp[44] = 0xe8; \
     *(unsigned int*)  &__tramp[45] = __dis; /* call __fun  */ \
     *(unsigned char*)  &__tramp[49] = 0xc2; /* ret  */ \
     *(unsigned short*)  &__tramp[50] = (__size + 8); /* ret (__size + 8)  */ \
   }
  
  #define FFI_INIT_TRAMPOLINE_STDCALL(TRAMP,FUN,CTX)  \
  { unsigned char *__tramp = (unsigned char*)(TRAMP); \
     unsigned int  __fun = (unsigned int)(FUN); \
     unsigned int  __ctx = (unsigned int)(CTX); \
     unsigned int  __dis = __fun - (__ctx + 10); \
     *(unsigned char*) &__tramp[0] = 0xb8; \
     *(unsigned int*)  &__tramp[1] = __ctx; /* movl __ctx, %eax */ \
     *(unsigned char *)  &__tramp[5] = 0xe8; \
     *(unsigned int*)  &__tramp[6] = __dis; /* call __fun  */ \
   }
  
  /* the cif must already be prep'ed */
  
  ffi_status
  ffi_prep_closure_loc (ffi_closure* closure,
                        ffi_cif* cif,
                        void (*fun)(ffi_cif*,void*,void**,void*),
                        void *user_data,
                        void *codeloc)
  {
  #ifdef X86_WIN64
  #define ISFLOAT(IDX) (cif->arg_types[IDX]->type == FFI_TYPE_FLOAT || cif->arg_types[IDX]->type == FFI_TYPE_DOUBLE)
  #define FLAG(IDX) (cif->nargs>(IDX)&&ISFLOAT(IDX)?(1<<(IDX)):0)
    if (cif->abi == FFI_WIN64) 
      {
        int mask = FLAG(0)|FLAG(1)|FLAG(2)|FLAG(3);
        FFI_INIT_TRAMPOLINE_WIN64 (&closure->tramp[0],
                                   &ffi_closure_win64,
                                   codeloc, mask);
        /* make sure we can execute here */
      }
  #else
    if (cif->abi == FFI_SYSV)
      {
        FFI_INIT_TRAMPOLINE (&closure->tramp[0],
                             &ffi_closure_SYSV,
                             (void*)codeloc);
      }
    else if (cif->abi == FFI_FASTCALL)
      {
        FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0],
  				   &ffi_closure_FASTCALL,
  				   (void*)codeloc);
      }
    else if (cif->abi == FFI_THISCALL)
      {
        FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0],
  				   &ffi_closure_THISCALL,
  				   (void*)codeloc);
      }
    else if (cif->abi == FFI_STDCALL)
      {
        FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0],
                                     &ffi_closure_STDCALL,
                                     (void*)codeloc);
      }
  #ifdef X86_WIN32
    else if (cif->abi == FFI_MS_CDECL)
      {
        FFI_INIT_TRAMPOLINE (&closure->tramp[0],
                             &ffi_closure_SYSV,
                             (void*)codeloc);
      }
  #endif /* X86_WIN32 */
  #endif /* !X86_WIN64 */
    else
      {
        return FFI_BAD_ABI;
      }
      
    closure->cif  = cif;
    closure->user_data = user_data;
    closure->fun  = fun;
  
    return FFI_OK;
  }
  
  /* ------- Native raw API support -------------------------------- */
  
  #if !FFI_NO_RAW_API
  
  ffi_status
  ffi_prep_raw_closure_loc (ffi_raw_closure* closure,
                            ffi_cif* cif,
                            void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
                            void *user_data,
                            void *codeloc)
  {
    int i;
  
    if (cif->abi != FFI_SYSV
  #ifdef X86_WIN32
        && cif->abi != FFI_THISCALL
  #endif
       )
      return FFI_BAD_ABI;
  
    /* we currently don't support certain kinds of arguments for raw
       closures.  This should be implemented by a separate assembly
       language routine, since it would require argument processing,
       something we don't do now for performance.  */
  
    for (i = cif->nargs-1; i >= 0; i--)
      {
        FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_STRUCT);
        FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_LONGDOUBLE);
      }
    
  #ifdef X86_WIN32
    if (cif->abi == FFI_SYSV)
      {
  #endif
    FFI_INIT_TRAMPOLINE (&closure->tramp[0], &ffi_closure_raw_SYSV,
                         codeloc);
  #ifdef X86_WIN32
      }
    else if (cif->abi == FFI_THISCALL)
      {
        FFI_INIT_TRAMPOLINE_RAW_THISCALL (&closure->tramp[0], &ffi_closure_raw_THISCALL, codeloc, cif->bytes);
      }
  #endif
    closure->cif  = cif;
    closure->user_data = user_data;
    closure->fun  = fun;
  
    return FFI_OK;
  }
  
  static void 
  ffi_prep_args_raw(char *stack, extended_cif *ecif)
  {
    memcpy (stack, ecif->avalue, ecif->cif->bytes);
  }
  
  /* we borrow this routine from libffi (it must be changed, though, to
   * actually call the function passed in the first argument.  as of
   * libffi-1.20, this is not the case.)
   */
  
  void
  ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *fake_avalue)
  {
    extended_cif ecif;
    void **avalue = (void **)fake_avalue;
  
    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->flags == FFI_TYPE_STRUCT
            || cif->flags == FFI_TYPE_MS_STRUCT))
      {
        ecif.rvalue = alloca(cif->rtype->size);
      }
    else
      ecif.rvalue = rvalue;
      
    
    switch (cif->abi) 
      {
  #ifndef X86_WIN32
      case FFI_SYSV:
        ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags,
                      ecif.rvalue, fn);
        break;
  #else
      case FFI_SYSV:
      case FFI_MS_CDECL:
  #endif
  #ifndef X86_WIN64
      case FFI_STDCALL:
        ffi_call_win32(ffi_prep_args_raw, &ecif, cif->abi, cif->bytes, cif->flags,
  		     ecif.rvalue, fn);
        break;
      case FFI_THISCALL:
      case FFI_FASTCALL:
        {
  	unsigned int abi = cif->abi;
  	unsigned int i, passed_regs = 0;
  
  	if (cif->flags == FFI_TYPE_STRUCT)
  	  ++passed_regs;
  
  	for (i=0; i < cif->nargs && passed_regs < 2;i++)
  	  {
  	    size_t sz;
  
  	    if (cif->arg_types[i]->type == FFI_TYPE_FLOAT
  	        || cif->arg_types[i]->type == FFI_TYPE_STRUCT)
  	      continue;
  	    sz = (cif->arg_types[i]->size + 3) & ~3;
  	    if (sz == 0 || sz > 4)
  	      continue;
  	    ++passed_regs;
  	  }
  	if (passed_regs < 2 && abi == FFI_FASTCALL)
  	  cif->abi = abi = FFI_THISCALL;
  	if (passed_regs < 1 && abi == FFI_THISCALL)
  	  cif->abi = abi = FFI_STDCALL;
          ffi_call_win32(ffi_prep_args_raw, &ecif, abi, cif->bytes, cif->flags,
                         ecif.rvalue, fn);
        }
        break;
  #endif
      default:
        FFI_ASSERT(0);
        break;
      }
  }
  
  #endif
  
  #endif /* !__x86_64__  || X86_WIN64 */
  
  

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