1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 2004 Renesas Technology
3
4 M32R 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
31 /* ffi_prep_args is called by the assembly routine once stack
32 space has been allocated for the function's arguments. */
33
34 /*@-exportheader@*/
ffi_prep_args(char * stack,extended_cif * ecif)35 void ffi_prep_args(char *stack, extended_cif *ecif)
36 /*@=exportheader@*/
37 {
38 unsigned int i;
39 int tmp;
40 unsigned int avn;
41 void **p_argv;
42 char *argp;
43 ffi_type **p_arg;
44
45 tmp = 0;
46 argp = stack;
47
48 if (ecif->cif->rtype->type == FFI_TYPE_STRUCT && ecif->cif->rtype->size > 8)
49 {
50 *(void **) argp = ecif->rvalue;
51 argp += 4;
52 }
53
54 avn = ecif->cif->nargs;
55 p_argv = ecif->avalue;
56
57 for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types;
58 (i != 0) && (avn != 0);
59 i--, p_arg++)
60 {
61 size_t z;
62
63 /* Align if necessary. */
64 if (((*p_arg)->alignment - 1) & (unsigned) argp)
65 argp = (char *) ALIGN (argp, (*p_arg)->alignment);
66
67 if (avn != 0)
68 {
69 avn--;
70 z = (*p_arg)->size;
71 if (z < sizeof (int))
72 {
73 z = sizeof (int);
74
75 switch ((*p_arg)->type)
76 {
77 case FFI_TYPE_SINT8:
78 *(signed int *) argp = (signed int)*(SINT8 *)(* p_argv);
79 break;
80
81 case FFI_TYPE_UINT8:
82 *(unsigned int *) argp = (unsigned int)*(UINT8 *)(* p_argv);
83 break;
84
85 case FFI_TYPE_SINT16:
86 *(signed int *) argp = (signed int)*(SINT16 *)(* p_argv);
87 break;
88
89 case FFI_TYPE_UINT16:
90 *(unsigned int *) argp = (unsigned int)*(UINT16 *)(* p_argv);
91 break;
92
93 case FFI_TYPE_STRUCT:
94 z = (*p_arg)->size;
95 if ((*p_arg)->alignment != 1)
96 memcpy (argp, *p_argv, z);
97 else
98 memcpy (argp + 4 - z, *p_argv, z);
99 z = sizeof (int);
100 break;
101
102 default:
103 FFI_ASSERT(0);
104 }
105 }
106 else if (z == sizeof (int))
107 {
108 *(unsigned int *) argp = (unsigned int)*(UINT32 *)(* p_argv);
109 }
110 else
111 {
112 if ((*p_arg)->type == FFI_TYPE_STRUCT)
113 {
114 if (z > 8)
115 {
116 *(unsigned int *) argp = (unsigned int)(void *)(* p_argv);
117 z = sizeof(void *);
118 }
119 else
120 {
121 memcpy(argp, *p_argv, z);
122 z = 8;
123 }
124 }
125 else
126 {
127 /* Double or long long 64bit. */
128 memcpy (argp, *p_argv, z);
129 }
130 }
131 p_argv++;
132 argp += z;
133 }
134 }
135
136 return;
137 }
138
139 /* Perform machine dependent cif processing. */
140 ffi_status
ffi_prep_cif_machdep(ffi_cif * cif)141 ffi_prep_cif_machdep(ffi_cif *cif)
142 {
143 /* Set the return type flag. */
144 switch (cif->rtype->type)
145 {
146 case FFI_TYPE_VOID:
147 cif->flags = (unsigned) cif->rtype->type;
148 break;
149
150 case FFI_TYPE_STRUCT:
151 if (cif->rtype->size <= 4)
152 cif->flags = FFI_TYPE_INT;
153
154 else if (cif->rtype->size <= 8)
155 cif->flags = FFI_TYPE_DOUBLE;
156
157 else
158 cif->flags = (unsigned) cif->rtype->type;
159 break;
160
161 case FFI_TYPE_SINT64:
162 case FFI_TYPE_UINT64:
163 case FFI_TYPE_DOUBLE:
164 cif->flags = FFI_TYPE_DOUBLE;
165 break;
166
167 case FFI_TYPE_FLOAT:
168 default:
169 cif->flags = FFI_TYPE_INT;
170 break;
171 }
172
173 return FFI_OK;
174 }
175
176 /*@-declundef@*/
177 /*@-exportheader@*/
178 extern void ffi_call_SYSV(void (*)(char *, extended_cif *),
179 /*@out@*/ extended_cif *,
180 unsigned, unsigned,
181 /*@out@*/ unsigned *,
182 void (*fn)());
183 /*@=declundef@*/
184 /*@=exportheader@*/
185
ffi_call(ffi_cif * cif,void (* fn)(),void * rvalue,void ** avalue)186 void ffi_call(/*@dependent@*/ ffi_cif *cif,
187 void (*fn)(),
188 /*@out@*/ void *rvalue,
189 /*@dependent@*/ void **avalue)
190 {
191 extended_cif ecif;
192
193 ecif.cif = cif;
194 ecif.avalue = avalue;
195
196 /* If the return value is a struct and we don't have
197 a return value address then we need to make one. */
198 if ((rvalue == NULL) &&
199 (cif->rtype->type == FFI_TYPE_STRUCT))
200 {
201 /*@-sysunrecog@*/
202 ecif.rvalue = alloca (cif->rtype->size);
203 /*@=sysunrecog@*/
204 }
205 else
206 ecif.rvalue = rvalue;
207
208 switch (cif->abi)
209 {
210 case FFI_SYSV:
211 /*@-usedef@*/
212 ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
213 cif->flags, ecif.rvalue, fn);
214 if (cif->rtype->type == FFI_TYPE_STRUCT)
215 {
216 int size = cif->rtype->size;
217 int align = cif->rtype->alignment;
218
219 if (size < 4)
220 {
221 if (align == 1)
222 *(unsigned long *)(ecif.rvalue) <<= (4 - size) * 8;
223 }
224 else if (4 < size && size < 8)
225 {
226 if (align == 1)
227 {
228 memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
229 }
230 else if (align == 2)
231 {
232 if (size & 1)
233 size += 1;
234
235 if (size != 8)
236 memcpy (ecif.rvalue, ecif.rvalue + 8-size, size);
237 }
238 }
239 }
240 /*@=usedef@*/
241 break;
242
243 default:
244 FFI_ASSERT(0);
245 break;
246 }
247 }
248