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

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• Hash : 70b11b47
  Author :
  Date : 2013-02-08T16:12:19
  

  Fix small struct passing on ppc

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• src/sparc/ffi.c

• /* -----------------------------------------------------------------------
     ffi.c - Copyright (c) 2011, 2013 Anthony Green
             Copyright (c) 1996, 2003-2004, 2007-2008 Red Hat, Inc.
     
     SPARC 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>
  
  
  /* ffi_prep_args is called by the assembly routine once stack space
     has been allocated for the function's arguments */
  
  void ffi_prep_args_v8(char *stack, extended_cif *ecif)
  {
    int i;
    void **p_argv;
    char *argp;
    ffi_type **p_arg;
  
    /* Skip 16 words for the window save area */
    argp = stack + 16*sizeof(int);
  
    /* This should only really be done when we are returning a structure,
       however, it's faster just to do it all the time...
  
    if ( ecif->cif->rtype->type == FFI_TYPE_STRUCT ) */
    *(int *) argp = (long)ecif->rvalue;
  
    /* And 1 word for the  structure return value. */
    argp += sizeof(int);
  
  #ifdef USING_PURIFY
    /* Purify will probably complain in our assembly routine, unless we
       zero out this memory. */
  
    ((int*)argp)[0] = 0;
    ((int*)argp)[1] = 0;
    ((int*)argp)[2] = 0;
    ((int*)argp)[3] = 0;
    ((int*)argp)[4] = 0;
    ((int*)argp)[5] = 0;
  #endif
  
    p_argv = ecif->avalue;
  
    for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; i; i--, p_arg++)
      {
        size_t z;
  
  	  if ((*p_arg)->type == FFI_TYPE_STRUCT
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	      || (*p_arg)->type == FFI_TYPE_LONGDOUBLE
  #endif
  	      )
  	    {
  	      *(unsigned int *) argp = (unsigned long)(* p_argv);
  	      z = sizeof(int);
  	    }
  	  else
  	    {
  	      z = (*p_arg)->size;
  	      if (z < sizeof(int))
  		{
  		  z = sizeof(int);
  		  switch ((*p_arg)->type)
  		    {
  		    case FFI_TYPE_SINT8:
  		      *(signed int *) argp = *(SINT8 *)(* p_argv);
  		      break;
  		      
  		    case FFI_TYPE_UINT8:
  		      *(unsigned int *) argp = *(UINT8 *)(* p_argv);
  		      break;
  		      
  		    case FFI_TYPE_SINT16:
  		      *(signed int *) argp = *(SINT16 *)(* p_argv);
  		      break;
  		      
  		    case FFI_TYPE_UINT16:
  		      *(unsigned int *) argp = *(UINT16 *)(* p_argv);
  		      break;
  
  		    default:
  		      FFI_ASSERT(0);
  		    }
  		}
  	      else
  		{
  		  memcpy(argp, *p_argv, z);
  		}
  	    }
  	  p_argv++;
  	  argp += z;
      }
    
    return;
  }
  
  int ffi_prep_args_v9(char *stack, extended_cif *ecif)
  {
    int i, ret = 0;
    int tmp;
    void **p_argv;
    char *argp;
    ffi_type **p_arg;
  
    tmp = 0;
  
    /* Skip 16 words for the window save area */
    argp = stack + 16*sizeof(long long);
  
  #ifdef USING_PURIFY
    /* Purify will probably complain in our assembly routine, unless we
       zero out this memory. */
  
    ((long long*)argp)[0] = 0;
    ((long long*)argp)[1] = 0;
    ((long long*)argp)[2] = 0;
    ((long long*)argp)[3] = 0;
    ((long long*)argp)[4] = 0;
    ((long long*)argp)[5] = 0;
  #endif
  
    p_argv = ecif->avalue;
  
    if (ecif->cif->rtype->type == FFI_TYPE_STRUCT &&
        ecif->cif->rtype->size > 32)
      {
        *(unsigned long long *) argp = (unsigned long)ecif->rvalue;
        argp += sizeof(long long);
        tmp = 1;
      }
  
    for (i = 0, p_arg = ecif->cif->arg_types; i < ecif->cif->nargs;
         i++, p_arg++)
      {
        size_t z;
  
        z = (*p_arg)->size;
        switch ((*p_arg)->type)
  	{
  	case FFI_TYPE_STRUCT:
  	  if (z > 16)
  	    {
  	      /* For structures larger than 16 bytes we pass reference.  */
  	      *(unsigned long long *) argp = (unsigned long)* p_argv;
  	      argp += sizeof(long long);
  	      tmp++;
  	      p_argv++;
  	      continue;
  	    }
  	  /* FALLTHROUGH */
  	case FFI_TYPE_FLOAT:
  	case FFI_TYPE_DOUBLE:
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	case FFI_TYPE_LONGDOUBLE:
  #endif
  	  ret = 1; /* We should promote into FP regs as well as integer.  */
  	  break;
  	}
        if (z < sizeof(long long))
  	{
  	  switch ((*p_arg)->type)
  	    {
  	    case FFI_TYPE_SINT8:
  	      *(signed long long *) argp = *(SINT8 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_UINT8:
  	      *(unsigned long long *) argp = *(UINT8 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_SINT16:
  	      *(signed long long *) argp = *(SINT16 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_UINT16:
  	      *(unsigned long long *) argp = *(UINT16 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_SINT32:
  	      *(signed long long *) argp = *(SINT32 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_UINT32:
  	      *(unsigned long long *) argp = *(UINT32 *)(* p_argv);
  	      break;
  
  	    case FFI_TYPE_FLOAT:
  	      *(float *) (argp + 4) = *(FLOAT32 *)(* p_argv); /* Right justify */
  	      break;
  
  	    case FFI_TYPE_STRUCT:
  	      memcpy(argp, *p_argv, z);
  	      break;
  
  	    default:
  	      FFI_ASSERT(0);
  	    }
  	  z = sizeof(long long);
  	  tmp++;
  	}
        else if (z == sizeof(long long))
  	{
  	  memcpy(argp, *p_argv, z);
  	  z = sizeof(long long);
  	  tmp++;
  	}
        else
  	{
  	  if ((tmp & 1) && (*p_arg)->alignment > 8)
  	    {
  	      tmp++;
  	      argp += sizeof(long long);
  	    }
  	  memcpy(argp, *p_argv, z);
  	  z = 2 * sizeof(long long);
  	  tmp += 2;
  	}
        p_argv++;
        argp += z;
      }
  
    return ret;
  }
  
  /* Perform machine dependent cif processing */
  ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
  {
    int wordsize;
  
    if (cif->abi != FFI_V9)
      {
        wordsize = 4;
  
        /* If we are returning a struct, this will already have been added.
  	 Otherwise we need to add it because it's always got to be there! */
  
        if (cif->rtype->type != FFI_TYPE_STRUCT)
  	cif->bytes += wordsize;
  
        /* sparc call frames require that space is allocated for 6 args,
  	 even if they aren't used. Make that space if necessary. */
    
        if (cif->bytes < 4*6+4)
  	cif->bytes = 4*6+4;
      }
    else
      {
        wordsize = 8;
  
        /* sparc call frames require that space is allocated for 6 args,
  	 even if they aren't used. Make that space if necessary. */
    
        if (cif->bytes < 8*6)
  	cif->bytes = 8*6;
      }
  
    /* Adjust cif->bytes. to include 16 words for the window save area,
       and maybe the struct/union return pointer area, */
  
    cif->bytes += 16 * wordsize;
  
    /* The stack must be 2 word aligned, so round bytes up
       appropriately. */
  
    cif->bytes = ALIGN(cif->bytes, 2 * wordsize);
  
    /* Set the return type flag */
    switch (cif->rtype->type)
      {
      case FFI_TYPE_VOID:
      case FFI_TYPE_FLOAT:
      case FFI_TYPE_DOUBLE:
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
      case FFI_TYPE_LONGDOUBLE:
  #endif
        cif->flags = cif->rtype->type;
        break;
  
      case FFI_TYPE_STRUCT:
        if (cif->abi == FFI_V9 && cif->rtype->size > 32)
  	cif->flags = FFI_TYPE_VOID;
        else
  	cif->flags = FFI_TYPE_STRUCT;
        break;
  
      case FFI_TYPE_SINT8:
      case FFI_TYPE_UINT8:
      case FFI_TYPE_SINT16:
      case FFI_TYPE_UINT16:
        if (cif->abi == FFI_V9)
  	cif->flags = FFI_TYPE_INT;
        else
  	cif->flags = cif->rtype->type;
        break;
  
      case FFI_TYPE_SINT64:
      case FFI_TYPE_UINT64:
        if (cif->abi == FFI_V9)
  	cif->flags = FFI_TYPE_INT;
        else
  	cif->flags = FFI_TYPE_SINT64;
        break;
  
      default:
        cif->flags = FFI_TYPE_INT;
        break;
      }
    return FFI_OK;
  }
  
  int ffi_v9_layout_struct(ffi_type *arg, int off, char *ret, char *intg, char *flt)
  {
    ffi_type **ptr = &arg->elements[0];
  
    while (*ptr != NULL)
      {
        if (off & ((*ptr)->alignment - 1))
  	off = ALIGN(off, (*ptr)->alignment);
  
        switch ((*ptr)->type)
  	{
  	case FFI_TYPE_STRUCT:
  	  off = ffi_v9_layout_struct(*ptr, off, ret, intg, flt);
  	  off = ALIGN(off, FFI_SIZEOF_ARG);
  	  break;
  	case FFI_TYPE_FLOAT:
  	case FFI_TYPE_DOUBLE:
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	case FFI_TYPE_LONGDOUBLE:
  #endif
  	  memmove(ret + off, flt + off, (*ptr)->size);
  	  off += (*ptr)->size;
  	  break;
  	default:
  	  memmove(ret + off, intg + off, (*ptr)->size);
  	  off += (*ptr)->size;
  	  break;
  	}
        ptr++;
      }
    return off;
  }
  
  
  #ifdef SPARC64
  extern int ffi_call_v9(void *, extended_cif *, unsigned, 
  		       unsigned, unsigned *, void (*fn)(void));
  #else
  extern int ffi_call_v8(void *, extended_cif *, unsigned, 
  		       unsigned, unsigned *, void (*fn)(void));
  #endif
  
  #ifndef __GNUC__
  void ffi_flush_icache (void *, size_t);
  #endif
  
  void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
  {
    extended_cif ecif;
    void *rval = rvalue;
  
    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		        */
  
    ecif.rvalue = rvalue;
    if (cif->rtype->type == FFI_TYPE_STRUCT)
      {
        if (cif->rtype->size <= 32)
  	rval = alloca(64);
        else
  	{
  	  rval = NULL;
  	  if (rvalue == NULL)
  	    ecif.rvalue = alloca(cif->rtype->size);
  	}
      }
  
    switch (cif->abi) 
      {
      case FFI_V8:
  #ifdef SPARC64
        /* We don't yet support calling 32bit code from 64bit */
        FFI_ASSERT(0);
  #else
        if (rvalue && (cif->rtype->type == FFI_TYPE_STRUCT
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	  || cif->flags == FFI_TYPE_LONGDOUBLE
  #endif
  	  ))
  	{
  	  /* For v8, we need an "unimp" with size of returning struct */
  	  /* behind "call", so we alloc some executable space for it. */
  	  /* l7 is used, we need to make sure v8.S doesn't use %l7.   */
  	  unsigned int *call_struct = NULL;
  	  ffi_closure_alloc(32, (void **)&call_struct);
  	  if (call_struct)
  	    {
  	      unsigned long f = (unsigned long)fn;
  	      call_struct[0] = 0xae10001f;		 /* mov   %i7, %l7	 */
  	      call_struct[1] = 0xbe10000f;		 /* mov   %o7, %i7	 */
  	      call_struct[2] = 0x03000000 | f >> 10;     /* sethi %hi(fn), %g1	 */
  	      call_struct[3] = 0x9fc06000 | (f & 0x3ff); /* jmp %g1+%lo(fn), %o7 */
  	      call_struct[4] = 0x01000000;		 /* nop			 */
  	      if (cif->rtype->size < 0x7f)
  		call_struct[5] = cif->rtype->size;	 /* unimp		 */
  	      else
  		call_struct[5] = 0x01000000;	     	 /* nop			 */
  	      call_struct[6] = 0x81c7e008;		 /* ret			 */
  	      call_struct[7] = 0xbe100017;		 /* mov   %l7, %i7	 */
  #ifdef __GNUC__
  	      asm volatile ("iflush %0; iflush %0+8; iflush %0+16; iflush %0+24" : :
  			    "r" (call_struct) : "memory");
  	      /* SPARC v8 requires 5 instructions for flush to be visible */
  	      asm volatile ("nop; nop; nop; nop; nop");
  #else
  	      ffi_flush_icache (call_struct, 32);
  #endif
  	      ffi_call_v8(ffi_prep_args_v8, &ecif, cif->bytes,
  			  cif->flags, rvalue, call_struct);
  	      ffi_closure_free(call_struct);
  	    }
  	  else
  	    {
  	      ffi_call_v8(ffi_prep_args_v8, &ecif, cif->bytes,
  			  cif->flags, rvalue, fn);
  	    }
  	}
        else
  	{
  	  ffi_call_v8(ffi_prep_args_v8, &ecif, cif->bytes,
  		      cif->flags, rvalue, fn);
  	}
  #endif
        break;
      case FFI_V9:
  #ifdef SPARC64
        ffi_call_v9(ffi_prep_args_v9, &ecif, cif->bytes,
  		  cif->flags, rval, fn);
        if (rvalue && rval && cif->rtype->type == FFI_TYPE_STRUCT)
  	ffi_v9_layout_struct(cif->rtype, 0, (char *)rvalue, (char *)rval, ((char *)rval)+32);
  #else
        /* And vice versa */
        FFI_ASSERT(0);
  #endif
        break;
      default:
        FFI_ASSERT(0);
        break;
      }
  }
  
  
  #ifdef SPARC64
  extern void ffi_closure_v9(void);
  #else
  extern void ffi_closure_v8(void);
  #endif
  
  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 = (unsigned int *) &closure->tramp[0];
    unsigned long fn;
  #ifdef SPARC64
    /* Trampoline address is equal to the closure address.  We take advantage
       of that to reduce the trampoline size by 8 bytes. */
    if (cif->abi != FFI_V9)
      return FFI_BAD_ABI;
    fn = (unsigned long) ffi_closure_v9;
    tramp[0] = 0x83414000;	/* rd	%pc, %g1	*/
    tramp[1] = 0xca586010;	/* ldx	[%g1+16], %g5	*/
    tramp[2] = 0x81c14000;	/* jmp	%g5		*/
    tramp[3] = 0x01000000;	/* nop			*/
    *((unsigned long *) &tramp[4]) = fn;
  #else
    unsigned long ctx = (unsigned long) codeloc;
    if (cif->abi != FFI_V8)
      return FFI_BAD_ABI;
    fn = (unsigned long) ffi_closure_v8;
    tramp[0] = 0x03000000 | fn >> 10;	/* sethi %hi(fn), %g1	*/
    tramp[1] = 0x05000000 | ctx >> 10;	/* sethi %hi(ctx), %g2	*/
    tramp[2] = 0x81c06000 | (fn & 0x3ff);	/* jmp   %g1+%lo(fn)	*/
    tramp[3] = 0x8410a000 | (ctx & 0x3ff);/* or    %g2, %lo(ctx)	*/
  #endif
  
    closure->cif = cif;
    closure->fun = fun;
    closure->user_data = user_data;
  
    /* Flush the Icache.  closure is 8 bytes aligned.  */
  #ifdef __GNUC__
  #ifdef SPARC64
    asm volatile ("flush	%0; flush %0+8" : : "r" (closure) : "memory");
  #else
    asm volatile ("iflush	%0; iflush %0+8" : : "r" (closure) : "memory");
    /* SPARC v8 requires 5 instructions for flush to be visible */
    asm volatile ("nop; nop; nop; nop; nop");
  #endif
  #else
    ffi_flush_icache (closure, 16);
  #endif
  
    return FFI_OK;
  }
  
  int
  ffi_closure_sparc_inner_v8(ffi_closure *closure,
    void *rvalue, unsigned long *gpr, unsigned long *scratch)
  {
    ffi_cif *cif;
    ffi_type **arg_types;
    void **avalue;
    int i, argn;
  
    cif = closure->cif;
    arg_types = cif->arg_types;
    avalue = alloca(cif->nargs * sizeof(void *));
  
    /* Copy the caller's structure return address so that the closure
       returns the data directly to the caller.  */
    if (cif->flags == FFI_TYPE_STRUCT
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE  
        || cif->flags == FFI_TYPE_LONGDOUBLE
  #endif
       )
      rvalue = (void *) gpr[0];
  
    /* Always skip the structure return address.  */
    argn = 1;
  
    /* Grab the addresses of the arguments from the stack frame.  */
    for (i = 0; i < cif->nargs; i++)
      {
        if (arg_types[i]->type == FFI_TYPE_STRUCT
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	  || arg_types[i]->type == FFI_TYPE_LONGDOUBLE
  #endif
           )
  	{
  	  /* Straight copy of invisible reference.  */
  	  avalue[i] = (void *)gpr[argn++];
  	}
        else if ((arg_types[i]->type == FFI_TYPE_DOUBLE
  	       || arg_types[i]->type == FFI_TYPE_SINT64
  	       || arg_types[i]->type == FFI_TYPE_UINT64)
  	       /* gpr is 8-byte aligned.  */
  	       && (argn % 2) != 0)
  	{
  	  /* Align on a 8-byte boundary.  */
  	  scratch[0] = gpr[argn];
  	  scratch[1] = gpr[argn+1];
  	  avalue[i] = scratch;
  	  scratch -= 2;
  	  argn += 2;
  	}
        else
  	{
  	  /* Always right-justify.  */
  	  argn += ALIGN(arg_types[i]->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
  	  avalue[i] = ((char *) &gpr[argn]) - arg_types[i]->size;
  	}
      }
  
    /* Invoke the closure.  */
    (closure->fun) (cif, rvalue, avalue, closure->user_data);
  
    /* Tell ffi_closure_sparc how to perform return type promotions.  */
    return cif->rtype->type;
  }
  
  int
  ffi_closure_sparc_inner_v9(ffi_closure *closure,
    void *rvalue, unsigned long *gpr, double *fpr)
  {
    ffi_cif *cif;
    ffi_type **arg_types;
    void **avalue;
    int i, argn, fp_slot_max;
  
    cif = closure->cif;
    arg_types = cif->arg_types;
    avalue = alloca(cif->nargs * sizeof(void *));
  
    /* Copy the caller's structure return address so that the closure
       returns the data directly to the caller.  */
    if (cif->flags == FFI_TYPE_VOID
        && cif->rtype->type == FFI_TYPE_STRUCT)
      {
        rvalue = (void *) gpr[0];
        /* Skip the structure return address.  */
        argn = 1;
      }
    else
      argn = 0;
  
    fp_slot_max = 16 - argn;
  
    /* Grab the addresses of the arguments from the stack frame.  */
    for (i = 0; i < cif->nargs; i++)
      {
        if (arg_types[i]->type == FFI_TYPE_STRUCT)
  	{
  	  if (arg_types[i]->size > 16)
  	    {
  	      /* Straight copy of invisible reference.  */
  	      avalue[i] = (void *)gpr[argn++];
  	    }
  	  else
  	    {
  	      /* Left-justify.  */
  	      ffi_v9_layout_struct(arg_types[i],
  				   0,
  				   (char *) &gpr[argn],
  				   (char *) &gpr[argn],
  				   (char *) &fpr[argn]);
  	      avalue[i] = &gpr[argn];
  	      argn += ALIGN(arg_types[i]->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
  	    }
  	}
        else
  	{
  	  /* Right-justify.  */
  	  argn += ALIGN(arg_types[i]->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
  
  	  /* Align on a 16-byte boundary.  */
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  	  if (arg_types[i]->type == FFI_TYPE_LONGDOUBLE && (argn % 2) != 0)
  	    argn++;
  #endif
  	  if (i < fp_slot_max
  	      && (arg_types[i]->type == FFI_TYPE_FLOAT
  		  || arg_types[i]->type == FFI_TYPE_DOUBLE
  #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
  		  || arg_types[i]->type == FFI_TYPE_LONGDOUBLE
  #endif
  		  ))
  	    avalue[i] = ((char *) &fpr[argn]) - arg_types[i]->size;
  	  else
  	    avalue[i] = ((char *) &gpr[argn]) - arg_types[i]->size;
  	}
      }
  
    /* Invoke the closure.  */
    (closure->fun) (cif, rvalue, avalue, closure->user_data);
  
    /* Tell ffi_closure_sparc how to perform return type promotions.  */
    return cif->rtype->type;
  }
  

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