1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 2013 Synopsys, Inc. (www.synopsys.com)
3
4 ARC Foreign Function Interface
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, EXPRESS
18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 IN NO EVENT SHALL RENESAS TECHNOLOGY BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 OTHER DEALINGS IN THE SOFTWARE.
24 ----------------------------------------------------------------------- */
25
26 #include <ffi.h>
27 #include <ffi_common.h>
28
29 #include <stdlib.h>
30 #include <stdint.h>
31
32 #include <sys/cachectl.h>
33
34 /* for little endian ARC, the code is in fact stored as mixed endian for
35 performance reasons */
36 #if __BIG_ENDIAN__
37 #define CODE_ENDIAN(x) (x)
38 #else
39 #define CODE_ENDIAN(x) ( (((uint32_t) (x)) << 16) | (((uint32_t) (x)) >> 16))
40 #endif
41
42 /* ffi_prep_args is called by the assembly routine once stack
43 space has been allocated for the function's arguments. */
44
45 void
ffi_prep_args(char * stack,extended_cif * ecif)46 ffi_prep_args (char *stack, extended_cif * ecif)
47 {
48 unsigned int i;
49 int tmp;
50 void **p_argv;
51 char *argp;
52 ffi_type **p_arg;
53
54 tmp = 0;
55 argp = stack;
56
57 if (ecif->cif->rtype->type == FFI_TYPE_STRUCT)
58 {
59 *(void **) argp = ecif->rvalue;
60 argp += 4;
61 }
62
63 p_argv = ecif->avalue;
64
65 for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
66 (i != 0); i--, p_arg++)
67 {
68 size_t z;
69 int alignment;
70
71 /* align alignment to 4 */
72 alignment = (((*p_arg)->alignment - 1) | 3) + 1;
73
74 /* Align if necessary. */
75 if ((alignment - 1) & (unsigned) argp)
76 argp = (char *) ALIGN (argp, alignment);
77
78 z = (*p_arg)->size;
79 if (z < sizeof (int))
80 {
81 z = sizeof (int);
82
83 switch ((*p_arg)->type)
84 {
85 case FFI_TYPE_SINT8:
86 *(signed int *) argp = (signed int) *(SINT8 *) (*p_argv);
87 break;
88
89 case FFI_TYPE_UINT8:
90 *(unsigned int *) argp = (unsigned int) *(UINT8 *) (*p_argv);
91 break;
92
93 case FFI_TYPE_SINT16:
94 *(signed int *) argp = (signed int) *(SINT16 *) (*p_argv);
95 break;
96
97 case FFI_TYPE_UINT16:
98 *(unsigned int *) argp = (unsigned int) *(UINT16 *) (*p_argv);
99 break;
100
101 case FFI_TYPE_STRUCT:
102 memcpy (argp, *p_argv, (*p_arg)->size);
103 break;
104
105 default:
106 FFI_ASSERT (0);
107 }
108 }
109 else if (z == sizeof (int))
110 {
111 *(unsigned int *) argp = (unsigned int) *(UINT32 *) (*p_argv);
112 }
113 else
114 {
115 if ((*p_arg)->type == FFI_TYPE_STRUCT)
116 {
117 memcpy (argp, *p_argv, z);
118 }
119 else
120 {
121 /* Double or long long 64bit. */
122 memcpy (argp, *p_argv, z);
123 }
124 }
125 p_argv++;
126 argp += z;
127 }
128
129 return;
130 }
131
132 /* Perform machine dependent cif processing. */
133 ffi_status
ffi_prep_cif_machdep(ffi_cif * cif)134 ffi_prep_cif_machdep (ffi_cif * cif)
135 {
136 /* Set the return type flag. */
137 switch (cif->rtype->type)
138 {
139 case FFI_TYPE_VOID:
140 cif->flags = (unsigned) cif->rtype->type;
141 break;
142
143 case FFI_TYPE_STRUCT:
144 cif->flags = (unsigned) cif->rtype->type;
145 break;
146
147 case FFI_TYPE_SINT64:
148 case FFI_TYPE_UINT64:
149 case FFI_TYPE_DOUBLE:
150 cif->flags = FFI_TYPE_DOUBLE;
151 break;
152
153 case FFI_TYPE_FLOAT:
154 default:
155 cif->flags = FFI_TYPE_INT;
156 break;
157 }
158
159 return FFI_OK;
160 }
161
162 extern void ffi_call_ARCompact (void (*)(char *, extended_cif *),
163 extended_cif *, unsigned, unsigned,
164 unsigned *, void (*fn) (void));
165
166 void
ffi_call(ffi_cif * cif,void (* fn)(void),void * rvalue,void ** avalue)167 ffi_call (ffi_cif * cif, void (*fn) (void), void *rvalue, void **avalue)
168 {
169 extended_cif ecif;
170
171 ecif.cif = cif;
172 ecif.avalue = avalue;
173
174 /* If the return value is a struct and we don't have
175 a return value address then we need to make one. */
176 if ((rvalue == NULL) && (cif->rtype->type == FFI_TYPE_STRUCT))
177 {
178 ecif.rvalue = alloca (cif->rtype->size);
179 }
180 else
181 ecif.rvalue = rvalue;
182
183 switch (cif->abi)
184 {
185 case FFI_ARCOMPACT:
186 ffi_call_ARCompact (ffi_prep_args, &ecif, cif->bytes,
187 cif->flags, ecif.rvalue, fn);
188 break;
189
190 default:
191 FFI_ASSERT (0);
192 break;
193 }
194 }
195
196 int
ffi_closure_inner_ARCompact(ffi_closure * closure,void * rvalue,ffi_arg * args)197 ffi_closure_inner_ARCompact (ffi_closure * closure, void *rvalue,
198 ffi_arg * args)
199 {
200 void **arg_area, **p_argv;
201 ffi_cif *cif = closure->cif;
202 char *argp = (char *) args;
203 ffi_type **p_argt;
204 int i;
205
206 arg_area = (void **) alloca (cif->nargs * sizeof (void *));
207
208 /* handle hidden argument */
209 if (cif->flags == FFI_TYPE_STRUCT)
210 {
211 rvalue = *(void **) argp;
212 argp += 4;
213 }
214
215 p_argv = arg_area;
216
217 for (i = 0, p_argt = cif->arg_types; i < cif->nargs;
218 i++, p_argt++, p_argv++)
219 {
220 size_t z;
221 int alignment;
222
223 /* align alignment to 4 */
224 alignment = (((*p_argt)->alignment - 1) | 3) + 1;
225
226 /* Align if necessary. */
227 if ((alignment - 1) & (unsigned) argp)
228 argp = (char *) ALIGN (argp, alignment);
229
230 z = (*p_argt)->size;
231 *p_argv = (void *) argp;
232 argp += z;
233 }
234
235 (closure->fun) (cif, rvalue, arg_area, closure->user_data);
236
237 return cif->flags;
238 }
239
240 extern void ffi_closure_ARCompact (void);
241
242 ffi_status
ffi_prep_closure_loc(ffi_closure * closure,ffi_cif * cif,void (* fun)(ffi_cif *,void *,void **,void *),void * user_data,void * codeloc)243 ffi_prep_closure_loc (ffi_closure * closure, ffi_cif * cif,
244 void (*fun) (ffi_cif *, void *, void **, void *),
245 void *user_data, void *codeloc)
246 {
247 uint32_t *tramp = (uint32_t *) & (closure->tramp[0]);
248
249 switch (cif->abi)
250 {
251 case FFI_ARCOMPACT:
252 FFI_ASSERT (tramp == codeloc);
253 tramp[0] = CODE_ENDIAN (0x200a1fc0); /* mov r8, pcl */
254 tramp[1] = CODE_ENDIAN (0x20200f80); /* j [long imm] */
255 tramp[2] = CODE_ENDIAN (ffi_closure_ARCompact);
256 break;
257
258 default:
259 return FFI_BAD_ABI;
260 }
261
262 closure->cif = cif;
263 closure->fun = fun;
264 closure->user_data = user_data;
265 cacheflush (codeloc, FFI_TRAMPOLINE_SIZE, BCACHE);
266
267 return FFI_OK;
268 }
269