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/* -----------------------------------------------------------------------

   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)

{

  register unsigned int i;

  register void **p_argv;

  register char *argp;

  register ffi_type **p_arg;

#ifdef X86_WIN32

  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

#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;

#ifdef X86_WIN32

      /* 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);

        }

#ifdef X86_WIN32

    /* 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

    }

#ifdef X86_WIN32

  /* 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:

#if defined(X86) || defined (X86_WIN32) || defined(X86_FREEBSD) || defined(X86_DARWIN) || defined(X86_WIN64)

    case FFI_TYPE_UINT8:

    case FFI_TYPE_UINT16:

    case FFI_TYPE_SINT8:

    case FFI_TYPE_SINT16:

#endif

#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

        {

          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 += ALIGN((*ptr)->size, FFI_SIZEOF_ARG);

    }

#ifdef X86_WIN64

  /* ensure space for storing four registers */

  cif->bytes += 4 * sizeof(ffi_arg);

#endif

#ifdef X86_DARWIN

  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));

#elif defined(X86_WIN32)

extern void

ffi_call_win32(void (*)(char *, extended_cif *), extended_cif *,

               unsigned, unsigned, unsigned, unsigned *, void (*fn)(void));

#else

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)

    {

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

    }

#endif

  else

    ecif.rvalue = rvalue;

  switch (cif->abi)

    {

#ifdef X86_WIN64

    case FFI_WIN64:

      {

        /* Make copies of all struct arguments

           NOTE: not sure if responsibility should be here or in caller */

        unsigned int i;

        for (i=0; i < cif->nargs;i++) {

          size_t size = cif->arg_types[i]->size;

          if ((cif->arg_types[i]->type == FFI_TYPE_STRUCT

               && (size != 1 && size != 2 && size != 4 && size != 8))

#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE

              || cif->arg_types[i]->type == FFI_TYPE_LONGDOUBLE

#endif

              )

            {

              void *local = alloca(size);

              memcpy(local, avalue[i], size);

              avalue[i] = local;

            }

        }

        ffi_call_win64(ffi_prep_args, &ecif, cif->bytes,

                       cif->flags, ecif.rvalue, fn);

      }

      break;

#elif defined(X86_WIN32)

    case FFI_SYSV:

    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;

#else

    case FFI_SYSV:

      ffi_call_SYSV(ffi_prep_args, &ecif, 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 - standard cdecl convention applies. */

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)));

void FFI_HIDDEN ffi_closure_STDCALL (ffi_closure *)

     __attribute__ ((regparm(1)));

void FFI_HIDDEN ffi_closure_THISCALL (ffi_closure *)

     __attribute__ ((regparm(1)));

#endif

#ifdef X86_WIN64

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 ) {

    *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_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); \