1 /* -----------------------------------------------------------------------
2    raw_api.c - Copyright (c) 1999, 2008  Red Hat, Inc.
3 
4    Author: Kresten Krab Thorup <krab@gnu.org>
5 
6    Permission is hereby granted, free of charge, to any person obtaining
7    a copy of this software and associated documentation files (the
8    ``Software''), to deal in the Software without restriction, including
9    without limitation the rights to use, copy, modify, merge, publish,
10    distribute, sublicense, and/or sell copies of the Software, and to
11    permit persons to whom the Software is furnished to do so, subject to
12    the following conditions:
13 
14    The above copyright notice and this permission notice shall be included
15    in all copies or substantial portions of the Software.
16 
17    THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
18    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20    NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24    DEALINGS IN THE SOFTWARE.
25    ----------------------------------------------------------------------- */
26 
27 /* This file defines generic functions for use with the raw api. */
28 
29 #include <ffi.h>
30 #include <ffi_common.h>
31 
32 #if !FFI_NO_RAW_API
33 
34 size_t
ffi_raw_size(ffi_cif * cif)35 ffi_raw_size (ffi_cif *cif)
36 {
37   size_t result = 0;
38   int i;
39 
40   ffi_type **at = cif->arg_types;
41 
42   for (i = cif->nargs-1; i >= 0; i--, at++)
43     {
44 #if !FFI_NO_STRUCTS
45       if ((*at)->type == FFI_TYPE_STRUCT)
46 	result += ALIGN (sizeof (void*), FFI_SIZEOF_ARG);
47       else
48 #endif
49 	result += ALIGN ((*at)->size, FFI_SIZEOF_ARG);
50     }
51 
52   return result;
53 }
54 
55 
56 void
ffi_raw_to_ptrarray(ffi_cif * cif,ffi_raw * raw,void ** args)57 ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args)
58 {
59   unsigned i;
60   ffi_type **tp = cif->arg_types;
61 
62 #if WORDS_BIGENDIAN
63 
64   for (i = 0; i < cif->nargs; i++, tp++, args++)
65     {
66       switch ((*tp)->type)
67 	{
68 	case FFI_TYPE_UINT8:
69 	case FFI_TYPE_SINT8:
70 	  *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 1);
71 	  break;
72 
73 	case FFI_TYPE_UINT16:
74 	case FFI_TYPE_SINT16:
75 	  *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 2);
76 	  break;
77 
78 #if FFI_SIZEOF_ARG >= 4
79 	case FFI_TYPE_UINT32:
80 	case FFI_TYPE_SINT32:
81 	  *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 4);
82 	  break;
83 #endif
84 
85 #if !FFI_NO_STRUCTS
86 	case FFI_TYPE_STRUCT:
87 	  *args = (raw++)->ptr;
88 	  break;
89 #endif
90 
91 	case FFI_TYPE_COMPLEX:
92 	  *args = (raw++)->ptr;
93 	  break;
94 
95 	case FFI_TYPE_POINTER:
96 	  *args = (void*) &(raw++)->ptr;
97 	  break;
98 
99 	default:
100 	  *args = raw;
101 	  raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
102 	}
103     }
104 
105 #else /* WORDS_BIGENDIAN */
106 
107 #if !PDP
108 
109   /* then assume little endian */
110   for (i = 0; i < cif->nargs; i++, tp++, args++)
111     {
112 #if !FFI_NO_STRUCTS
113       if ((*tp)->type == FFI_TYPE_STRUCT)
114 	{
115 	  *args = (raw++)->ptr;
116 	}
117       else
118 #endif
119       if ((*tp)->type == FFI_TYPE_COMPLEX)
120 	{
121 	  *args = (raw++)->ptr;
122 	}
123       else
124 	{
125 	  *args = (void*) raw;
126 	  raw += ALIGN ((*tp)->size, sizeof (void*)) / sizeof (void*);
127 	}
128     }
129 
130 #else
131 #error "pdp endian not supported"
132 #endif /* ! PDP */
133 
134 #endif /* WORDS_BIGENDIAN */
135 }
136 
137 void
ffi_ptrarray_to_raw(ffi_cif * cif,void ** args,ffi_raw * raw)138 ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw)
139 {
140   unsigned i;
141   ffi_type **tp = cif->arg_types;
142 
143   for (i = 0; i < cif->nargs; i++, tp++, args++)
144     {
145       switch ((*tp)->type)
146 	{
147 	case FFI_TYPE_UINT8:
148 	  (raw++)->uint = *(UINT8*) (*args);
149 	  break;
150 
151 	case FFI_TYPE_SINT8:
152 	  (raw++)->sint = *(SINT8*) (*args);
153 	  break;
154 
155 	case FFI_TYPE_UINT16:
156 	  (raw++)->uint = *(UINT16*) (*args);
157 	  break;
158 
159 	case FFI_TYPE_SINT16:
160 	  (raw++)->sint = *(SINT16*) (*args);
161 	  break;
162 
163 #if FFI_SIZEOF_ARG >= 4
164 	case FFI_TYPE_UINT32:
165 	  (raw++)->uint = *(UINT32*) (*args);
166 	  break;
167 
168 	case FFI_TYPE_SINT32:
169 	  (raw++)->sint = *(SINT32*) (*args);
170 	  break;
171 #endif
172 
173 #if !FFI_NO_STRUCTS
174 	case FFI_TYPE_STRUCT:
175 	  (raw++)->ptr = *args;
176 	  break;
177 #endif
178 
179 	case FFI_TYPE_COMPLEX:
180 	  (raw++)->ptr = *args;
181 	  break;
182 
183 	case FFI_TYPE_POINTER:
184 	  (raw++)->ptr = **(void***) args;
185 	  break;
186 
187 	default:
188 	  memcpy ((void*) raw->data, (void*)*args, (*tp)->size);
189 	  raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
190 	}
191     }
192 }
193 
194 #if !FFI_NATIVE_RAW_API
195 
196 
197 /* This is a generic definition of ffi_raw_call, to be used if the
198  * native system does not provide a machine-specific implementation.
199  * Having this, allows code to be written for the raw API, without
200  * the need for system-specific code to handle input in that format;
201  * these following couple of functions will handle the translation forth
202  * and back automatically. */
203 
ffi_raw_call(ffi_cif * cif,void (* fn)(void),void * rvalue,ffi_raw * raw)204 void ffi_raw_call (ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *raw)
205 {
206   void **avalue = (void**) alloca (cif->nargs * sizeof (void*));
207   ffi_raw_to_ptrarray (cif, raw, avalue);
208   ffi_call (cif, fn, rvalue, avalue);
209 }
210 
211 #if FFI_CLOSURES		/* base system provides closures */
212 
213 static void
ffi_translate_args(ffi_cif * cif,void * rvalue,void ** avalue,void * user_data)214 ffi_translate_args (ffi_cif *cif, void *rvalue,
215 		    void **avalue, void *user_data)
216 {
217   ffi_raw *raw = (ffi_raw*)alloca (ffi_raw_size (cif));
218   ffi_raw_closure *cl = (ffi_raw_closure*)user_data;
219 
220   ffi_ptrarray_to_raw (cif, avalue, raw);
221   (*cl->fun) (cif, rvalue, raw, cl->user_data);
222 }
223 
224 ffi_status
ffi_prep_raw_closure_loc(ffi_raw_closure * cl,ffi_cif * cif,void (* fun)(ffi_cif *,void *,ffi_raw *,void *),void * user_data,void * codeloc)225 ffi_prep_raw_closure_loc (ffi_raw_closure* cl,
226 			  ffi_cif *cif,
227 			  void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
228 			  void *user_data,
229 			  void *codeloc)
230 {
231   ffi_status status;
232 
233   status = ffi_prep_closure_loc ((ffi_closure*) cl,
234 				 cif,
235 				 &ffi_translate_args,
236 				 codeloc,
237 				 codeloc);
238   if (status == FFI_OK)
239     {
240       cl->fun       = fun;
241       cl->user_data = user_data;
242     }
243 
244   return status;
245 }
246 
247 #endif /* FFI_CLOSURES */
248 #endif /* !FFI_NATIVE_RAW_API */
249 
250 #if FFI_CLOSURES
251 
252 /* Again, here is the generic version of ffi_prep_raw_closure, which
253  * will install an intermediate "hub" for translation of arguments from
254  * the pointer-array format, to the raw format */
255 
256 ffi_status
ffi_prep_raw_closure(ffi_raw_closure * cl,ffi_cif * cif,void (* fun)(ffi_cif *,void *,ffi_raw *,void *),void * user_data)257 ffi_prep_raw_closure (ffi_raw_closure* cl,
258 		      ffi_cif *cif,
259 		      void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
260 		      void *user_data)
261 {
262   return ffi_prep_raw_closure_loc (cl, cif, fun, user_data, cl);
263 }
264 
265 #endif /* FFI_CLOSURES */
266 
267 #endif /* !FFI_NO_RAW_API */
268