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_POINTER:
92 *args = (void*) &(raw++)->ptr;
93 break;
94
95 default:
96 *args = raw;
97 raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
98 }
99 }
100
101 #else /* WORDS_BIGENDIAN */
102
103 #if !PDP
104
105 /* then assume little endian */
106 for (i = 0; i < cif->nargs; i++, tp++, args++)
107 {
108 #if !FFI_NO_STRUCTS
109 if ((*tp)->type == FFI_TYPE_STRUCT)
110 {
111 *args = (raw++)->ptr;
112 }
113 else
114 #endif
115 {
116 *args = (void*) raw;
117 raw += ALIGN ((*tp)->size, sizeof (void*)) / sizeof (void*);
118 }
119 }
120
121 #else
122 #error "pdp endian not supported"
123 #endif /* ! PDP */
124
125 #endif /* WORDS_BIGENDIAN */
126 }
127
128 void
ffi_ptrarray_to_raw(ffi_cif * cif,void ** args,ffi_raw * raw)129 ffi_ptrarray_to_raw (ffi_cif *cif, void **args, ffi_raw *raw)
130 {
131 unsigned i;
132 ffi_type **tp = cif->arg_types;
133
134 for (i = 0; i < cif->nargs; i++, tp++, args++)
135 {
136 switch ((*tp)->type)
137 {
138 case FFI_TYPE_UINT8:
139 (raw++)->uint = *(UINT8*) (*args);
140 break;
141
142 case FFI_TYPE_SINT8:
143 (raw++)->sint = *(SINT8*) (*args);
144 break;
145
146 case FFI_TYPE_UINT16:
147 (raw++)->uint = *(UINT16*) (*args);
148 break;
149
150 case FFI_TYPE_SINT16:
151 (raw++)->sint = *(SINT16*) (*args);
152 break;
153
154 #if FFI_SIZEOF_ARG >= 4
155 case FFI_TYPE_UINT32:
156 (raw++)->uint = *(UINT32*) (*args);
157 break;
158
159 case FFI_TYPE_SINT32:
160 (raw++)->sint = *(SINT32*) (*args);
161 break;
162 #endif
163
164 #if !FFI_NO_STRUCTS
165 case FFI_TYPE_STRUCT:
166 (raw++)->ptr = *args;
167 break;
168 #endif
169
170 case FFI_TYPE_POINTER:
171 (raw++)->ptr = **(void***) args;
172 break;
173
174 default:
175 memcpy ((void*) raw->data, (void*)*args, (*tp)->size);
176 raw += ALIGN ((*tp)->size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
177 }
178 }
179 }
180
181 #if !FFI_NATIVE_RAW_API
182
183
184 /* This is a generic definition of ffi_raw_call, to be used if the
185 * native system does not provide a machine-specific implementation.
186 * Having this, allows code to be written for the raw API, without
187 * the need for system-specific code to handle input in that format;
188 * these following couple of functions will handle the translation forth
189 * and back automatically. */
190
ffi_raw_call(ffi_cif * cif,void (* fn)(void),void * rvalue,ffi_raw * raw)191 void ffi_raw_call (ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *raw)
192 {
193 void **avalue = (void**) alloca (cif->nargs * sizeof (void*));
194 ffi_raw_to_ptrarray (cif, raw, avalue);
195 ffi_call (cif, fn, rvalue, avalue);
196 }
197
198 #if FFI_CLOSURES /* base system provides closures */
199
200 static void
ffi_translate_args(ffi_cif * cif,void * rvalue,void ** avalue,void * user_data)201 ffi_translate_args (ffi_cif *cif, void *rvalue,
202 void **avalue, void *user_data)
203 {
204 ffi_raw *raw = (ffi_raw*)alloca (ffi_raw_size (cif));
205 ffi_raw_closure *cl = (ffi_raw_closure*)user_data;
206
207 ffi_ptrarray_to_raw (cif, avalue, raw);
208 (*cl->fun) (cif, rvalue, raw, cl->user_data);
209 }
210
211 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)212 ffi_prep_raw_closure_loc (ffi_raw_closure* cl,
213 ffi_cif *cif,
214 void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
215 void *user_data,
216 void *codeloc)
217 {
218 ffi_status status;
219
220 status = ffi_prep_closure_loc ((ffi_closure*) cl,
221 cif,
222 &ffi_translate_args,
223 codeloc,
224 codeloc);
225 if (status == FFI_OK)
226 {
227 cl->fun = fun;
228 cl->user_data = user_data;
229 }
230
231 return status;
232 }
233
234 #endif /* FFI_CLOSURES */
235 #endif /* !FFI_NATIVE_RAW_API */
236
237 #if FFI_CLOSURES
238
239 /* Again, here is the generic version of ffi_prep_raw_closure, which
240 * will install an intermediate "hub" for translation of arguments from
241 * the pointer-array format, to the raw format */
242
243 ffi_status
ffi_prep_raw_closure(ffi_raw_closure * cl,ffi_cif * cif,void (* fun)(ffi_cif *,void *,ffi_raw *,void *),void * user_data)244 ffi_prep_raw_closure (ffi_raw_closure* cl,
245 ffi_cif *cif,
246 void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
247 void *user_data)
248 {
249 return ffi_prep_raw_closure_loc (cl, cif, fun, user_data, cl);
250 }
251
252 #endif /* FFI_CLOSURES */
253
254 #endif /* !FFI_NO_RAW_API */
255