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 #ifdef GSTREAMER_LITE
33 #include <string.h>
34 #endif // GSTREAMER_LITE
35
36 #if !FFI_NO_RAW_API
37
38 size_t
39 ffi_raw_size (ffi_cif *cif)
40 {
41 size_t result = 0;
42 int i;
43
44 ffi_type **at = cif->arg_types;
45
46 for (i = cif->nargs-1; i >= 0; i--, at++)
47 {
48 #if !FFI_NO_STRUCTS
49 if ((*at)->type == FFI_TYPE_STRUCT)
50 result += FFI_ALIGN (sizeof (void*), FFI_SIZEOF_ARG);
51 else
52 #endif
53 result += FFI_ALIGN ((*at)->size, FFI_SIZEOF_ARG);
54 }
55
56 return result;
57 }
58
59
60 void
61 ffi_raw_to_ptrarray (ffi_cif *cif, ffi_raw *raw, void **args)
62 {
63 unsigned i;
64 ffi_type **tp = cif->arg_types;
65
66 #if WORDS_BIGENDIAN
67
68 for (i = 0; i < cif->nargs; i++, tp++, args++)
69 {
70 switch ((*tp)->type)
71 {
72 case FFI_TYPE_UINT8:
73 case FFI_TYPE_SINT8:
74 *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 1);
75 break;
76
77 case FFI_TYPE_UINT16:
78 case FFI_TYPE_SINT16:
79 *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 2);
80 break;
81
82 #if FFI_SIZEOF_ARG >= 4
83 case FFI_TYPE_UINT32:
84 case FFI_TYPE_SINT32:
85 *args = (void*) ((char*)(raw++) + FFI_SIZEOF_ARG - 4);
86 break;
87 #endif
88
89 #if !FFI_NO_STRUCTS
90 case FFI_TYPE_STRUCT:
91 *args = (raw++)->ptr;
92 break;
93 #endif
94
95 case FFI_TYPE_COMPLEX:
96 *args = (raw++)->ptr;
97 break;
98
99 case FFI_TYPE_POINTER:
100 *args = (void*) &(raw++)->ptr;
101 break;
102
103 default:
104 *args = raw;
105 raw += FFI_ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
106 }
107 }
108
109 #else /* WORDS_BIGENDIAN */
110
111 #if !PDP
112
113 /* then assume little endian */
114 for (i = 0; i < cif->nargs; i++, tp++, args++)
115 {
116 #if !FFI_NO_STRUCTS
117 if ((*tp)->type == FFI_TYPE_STRUCT)
118 {
119 *args = (raw++)->ptr;
120 }
121 else
122 #endif
123 if ((*tp)->type == FFI_TYPE_COMPLEX)
124 {
125 *args = (raw++)->ptr;
126 }
127 else
128 {
129 *args = (void*) raw;
130 raw += FFI_ALIGN ((*tp)->size, sizeof (void*)) / sizeof (void*);
131 }
132 }
133
134 #else
135 #error "pdp endian not supported"
136 #endif /* ! PDP */
137
138 #endif /* WORDS_BIGENDIAN */
139 }
140
141 void
142 ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw)
143 {
144 unsigned i;
145 ffi_type **tp = cif->arg_types;
146
147 for (i = 0; i < cif->nargs; i++, tp++, args++)
148 {
149 switch ((*tp)->type)
150 {
151 case FFI_TYPE_UINT8:
152 (raw++)->uint = *(UINT8*) (*args);
153 break;
154
155 case FFI_TYPE_SINT8:
156 (raw++)->sint = *(SINT8*) (*args);
157 break;
158
159 case FFI_TYPE_UINT16:
160 (raw++)->uint = *(UINT16*) (*args);
161 break;
162
163 case FFI_TYPE_SINT16:
164 (raw++)->sint = *(SINT16*) (*args);
165 break;
166
167 #if FFI_SIZEOF_ARG >= 4
168 case FFI_TYPE_UINT32:
169 (raw++)->uint = *(UINT32*) (*args);
170 break;
171
172 case FFI_TYPE_SINT32:
173 (raw++)->sint = *(SINT32*) (*args);
174 break;
175 #endif
176
177 #if !FFI_NO_STRUCTS
178 case FFI_TYPE_STRUCT:
179 (raw++)->ptr = *args;
180 break;
181 #endif
182
183 case FFI_TYPE_COMPLEX:
184 (raw++)->ptr = *args;
185 break;
186
187 case FFI_TYPE_POINTER:
188 (raw++)->ptr = **(void***) args;
189 break;
190
191 default:
192 memcpy ((void*) raw->data, (void*)*args, (*tp)->size);
193 raw += FFI_ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
194 }
195 }
196 }
197
198 #if !FFI_NATIVE_RAW_API
199
200
201 /* This is a generic definition of ffi_raw_call, to be used if the
202 * native system does not provide a machine-specific implementation.
203 * Having this, allows code to be written for the raw API, without
204 * the need for system-specific code to handle input in that format;
205 * these following couple of functions will handle the translation forth
206 * and back automatically. */
207
208 void ffi_raw_call (ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *raw)
209 {
210 void **avalue = (void**) alloca (cif->nargs * sizeof (void*));
211 ffi_raw_to_ptrarray (cif, raw, avalue);
212 ffi_call (cif, fn, rvalue, avalue);
213 }
214
215 #if FFI_CLOSURES /* base system provides closures */
216
217 static void
218 ffi_translate_args (ffi_cif *cif, void *rvalue,
219 void **avalue, void *user_data)
220 {
221 ffi_raw *raw = (ffi_raw*)alloca (ffi_raw_size (cif));
222 ffi_raw_closure *cl = (ffi_raw_closure*)user_data;
223
224 ffi_ptrarray_to_raw (cif, avalue, raw);
225 (*cl->fun) (cif, rvalue, raw, cl->user_data);
226 }
227
228 ffi_status
229 ffi_prep_raw_closure_loc (ffi_raw_closure* cl,
230 ffi_cif *cif,
231 void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
232 void *user_data,
233 void *codeloc)
234 {
235 ffi_status status;
236
237 status = ffi_prep_closure_loc ((ffi_closure*) cl,
238 cif,
239 &ffi_translate_args,
240 codeloc,
241 codeloc);
242 if (status == FFI_OK)
243 {
244 cl->fun = fun;
245 cl->user_data = user_data;
246 }
247
248 return status;
249 }
250
251 #endif /* FFI_CLOSURES */
252 #endif /* !FFI_NATIVE_RAW_API */
253
254 #if FFI_CLOSURES
255
256 /* Again, here is the generic version of ffi_prep_raw_closure, which
257 * will install an intermediate "hub" for translation of arguments from
258 * the pointer-array format, to the raw format */
259
260 ffi_status
261 ffi_prep_raw_closure (ffi_raw_closure* cl,
262 ffi_cif *cif,
263 void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
264 void *user_data)
265 {
266 return ffi_prep_raw_closure_loc (cl, cif, fun, user_data, cl);
267 }
268
269 #endif /* FFI_CLOSURES */
270
271 #endif /* !FFI_NO_RAW_API */