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
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 += FFI_ALIGN (sizeof (void*), FFI_SIZEOF_ARG);
47 else
48 #endif
49 result += FFI_ALIGN ((*at)->size, FFI_SIZEOF_ARG);
50 }
51
52 return result;
53 }
54
55
56 void
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 += FFI_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 += FFI_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
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 += FFI_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
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
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
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
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 */