1/* -----------------------------------------------------------------------
2   ffi.c - Copyright (c) 2004  Renesas Technology
3           Copyright (c) 2008  Red Hat, Inc.
4
5   M32R Foreign Function Interface
6
7   Permission is hereby granted, free of charge, to any person obtaining
8   a copy of this software and associated documentation files (the
9   ``Software''), to deal in the Software without restriction, including
10   without limitation the rights to use, copy, modify, merge, publish,
11   distribute, sublicense, and/or sell copies of the Software, and to
12   permit persons to whom the Software is furnished to do so, subject to
13   the following conditions:
14
15   The above copyright notice and this permission notice shall be included
16   in all copies or substantial portions of the Software.
17
18   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
19   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21   IN NO EVENT SHALL RENESAS TECHNOLOGY BE LIABLE FOR ANY CLAIM, DAMAGES OR
22   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24   OTHER DEALINGS IN THE SOFTWARE.
25   ----------------------------------------------------------------------- */
26
27#include <ffi.h>
28#include <ffi_common.h>
29
30#include <stdlib.h>
31
32/* ffi_prep_args is called by the assembly routine once stack
33   space has been allocated for the function's arguments.  */
34
35void ffi_prep_args(char *stack, extended_cif *ecif)
36{
37  unsigned int i;
38  int tmp;
39  unsigned int avn;
40  void **p_argv;
41  char *argp;
42  ffi_type **p_arg;
43
44  tmp = 0;
45  argp = stack;
46
47  if (ecif->cif->rtype->type == FFI_TYPE_STRUCT && ecif->cif->rtype->size > 8)
48    {
49      *(void **) argp = ecif->rvalue;
50      argp += 4;
51    }
52
53  avn = ecif->cif->nargs;
54  p_argv = ecif->avalue;
55
56  for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
57       (i != 0) && (avn != 0);
58       i--, p_arg++)
59    {
60      size_t z;
61
62      /* Align if necessary.  */
63      if (((*p_arg)->alignment - 1) & (unsigned) argp)
64	argp = (char *) ALIGN (argp, (*p_arg)->alignment);
65
66      if (avn != 0)
67	{
68	  avn--;
69	  z = (*p_arg)->size;
70	  if (z < sizeof (int))
71	    {
72	      z = sizeof (int);
73
74	      switch ((*p_arg)->type)
75		{
76		case FFI_TYPE_SINT8:
77		  *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
78		  break;
79
80		case FFI_TYPE_UINT8:
81		  *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
82		  break;
83
84		case FFI_TYPE_SINT16:
85		  *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
86		  break;
87
88		case FFI_TYPE_UINT16:
89		  *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
90		  break;
91
92		case FFI_TYPE_STRUCT:
93	  	  z = (*p_arg)->size;
94	  	  if ((*p_arg)->alignment != 1)
95		    memcpy (argp, *p_argv, z);
96		  else
97		    memcpy (argp + 4 - z, *p_argv, z);
98	  	  z = sizeof (int);
99		  break;
100
101		default:
102		  FFI_ASSERT(0);
103		}
104	    }
105	  else if (z == sizeof (int))
106	    {
107	       *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
108	    }
109	  else
110	    {
111	      if ((*p_arg)->type == FFI_TYPE_STRUCT)
112	        {
113		  if (z > 8)
114		    {
115		      *(unsigned int *) argp = (unsigned int)(void *)(* p_argv);
116		      z = sizeof(void *);
117		    }
118		  else
119		    {
120	              memcpy(argp, *p_argv, z);
121		      z = 8;
122		    }
123	        }
124	      else
125	        {
126		  /* Double or long long 64bit.  */
127	          memcpy (argp, *p_argv, z);
128	        }
129	    }
130	  p_argv++;
131	  argp += z;
132	}
133    }
134
135  return;
136}
137
138/* Perform machine dependent cif processing.  */
139ffi_status
140ffi_prep_cif_machdep(ffi_cif *cif)
141{
142  /* Set the return type flag.  */
143  switch (cif->rtype->type)
144    {
145    case FFI_TYPE_VOID:
146      cif->flags = (unsigned) cif->rtype->type;
147      break;
148
149    case FFI_TYPE_STRUCT:
150      if (cif->rtype->size <= 4)
151	cif->flags = FFI_TYPE_INT;
152
153      else if (cif->rtype->size <= 8)
154	cif->flags = FFI_TYPE_DOUBLE;
155
156      else
157	cif->flags = (unsigned) cif->rtype->type;
158      break;
159
160    case FFI_TYPE_SINT64:
161    case FFI_TYPE_UINT64:
162    case FFI_TYPE_DOUBLE:
163      cif->flags = FFI_TYPE_DOUBLE;
164      break;
165
166    case FFI_TYPE_FLOAT:
167    default:
168      cif->flags = FFI_TYPE_INT;
169      break;
170    }
171
172  return FFI_OK;
173}
174
175extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *,
176			  unsigned, unsigned, unsigned *, void (*fn)(void));
177
178void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
179{
180  extended_cif ecif;
181
182  ecif.cif = cif;
183  ecif.avalue = avalue;
184
185  /* If the return value is a struct and we don't have
186     a return value address then we need to make one.  */
187  if ((rvalue == NULL) &&
188      (cif->rtype->type == FFI_TYPE_STRUCT))
189    {
190      ecif.rvalue = alloca (cif->rtype->size);
191    }
192  else
193    ecif.rvalue = rvalue;
194
195  switch (cif->abi)
196    {
197    case FFI_SYSV:
198      ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
199		    cif->flags, ecif.rvalue, fn);
200      if (cif->rtype->type == FFI_TYPE_STRUCT)
201	{
202	  int size = cif->rtype->size;
203	  int align = cif->rtype->alignment;
204
205	  if (size < 4)
206	    {
207	      if (align == 1)
208	        *(unsigned long *)(ecif.rvalue) <<= (4 - size) * 8;
209	    }
210	  else if (4 < size && size < 8)
211	    {
212	      if (align == 1)
213		{
214		  memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
215		}
216	      else if (align == 2)
217		{
218		  if (size & 1)
219		    size += 1;
220
221		  if (size != 8)
222		    memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
223		}
224	    }
225	}
226      break;
227
228    default:
229      FFI_ASSERT(0);
230      break;
231    }
232}
233