1 /* -----------------------------------------------------------------------
2 ffi.c - Copyright (c) 2012 Anthony Green
3 Copyright (c) 1998, 2001, 2007, 2008 Red Hat, Inc.
4
5 Alpha Foreign Function Interface
6
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 ``Software''), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14
15 The above copyright notice and this permission notice shall be included
16 in all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 DEALINGS IN THE SOFTWARE.
26 ----------------------------------------------------------------------- */
27
28 #include <ffi.h>
29 #include <ffi_common.h>
30 #include <stdlib.h>
31
32 /* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
33 all further uses in this file will refer to the 128-bit type. */
34 #if defined(__LONG_DOUBLE_128__)
35 # if FFI_TYPE_LONGDOUBLE != 4
36 # error FFI_TYPE_LONGDOUBLE out of date
37 # endif
38 #else
39 # undef FFI_TYPE_LONGDOUBLE
40 # define FFI_TYPE_LONGDOUBLE 4
41 #endif
42
43 extern void ffi_call_osf(void *, unsigned long, unsigned, void *, void (*)(void))
44 FFI_HIDDEN;
45 extern void ffi_closure_osf(void) FFI_HIDDEN;
46
47
48 ffi_status
ffi_prep_cif_machdep(ffi_cif * cif)49 ffi_prep_cif_machdep(ffi_cif *cif)
50 {
51 /* Adjust cif->bytes to represent a minimum 6 words for the temporary
52 register argument loading area. */
53 if (cif->bytes < 6*FFI_SIZEOF_ARG)
54 cif->bytes = 6*FFI_SIZEOF_ARG;
55
56 /* Set the return type flag */
57 switch (cif->rtype->type)
58 {
59 case FFI_TYPE_STRUCT:
60 case FFI_TYPE_FLOAT:
61 case FFI_TYPE_DOUBLE:
62 cif->flags = cif->rtype->type;
63 break;
64
65 case FFI_TYPE_LONGDOUBLE:
66 /* 128-bit long double is returned in memory, like a struct. */
67 cif->flags = FFI_TYPE_STRUCT;
68 break;
69
70 default:
71 cif->flags = FFI_TYPE_INT;
72 break;
73 }
74
75 return FFI_OK;
76 }
77
78
79 void
ffi_call(ffi_cif * cif,void (* fn)(void),void * rvalue,void ** avalue)80 ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
81 {
82 unsigned long *stack, *argp;
83 long i, avn;
84 ffi_type **arg_types;
85
86 /* If the return value is a struct and we don't have a return
87 value address then we need to make one. */
88 if (rvalue == NULL && cif->flags == FFI_TYPE_STRUCT)
89 rvalue = alloca(cif->rtype->size);
90
91 /* Allocate the space for the arguments, plus 4 words of temp
92 space for ffi_call_osf. */
93 argp = stack = alloca(cif->bytes + 4*FFI_SIZEOF_ARG);
94
95 if (cif->flags == FFI_TYPE_STRUCT)
96 *(void **) argp++ = rvalue;
97
98 i = 0;
99 avn = cif->nargs;
100 arg_types = cif->arg_types;
101
102 while (i < avn)
103 {
104 size_t size = (*arg_types)->size;
105
106 switch ((*arg_types)->type)
107 {
108 case FFI_TYPE_SINT8:
109 *(SINT64 *) argp = *(SINT8 *)(* avalue);
110 break;
111
112 case FFI_TYPE_UINT8:
113 *(SINT64 *) argp = *(UINT8 *)(* avalue);
114 break;
115
116 case FFI_TYPE_SINT16:
117 *(SINT64 *) argp = *(SINT16 *)(* avalue);
118 break;
119
120 case FFI_TYPE_UINT16:
121 *(SINT64 *) argp = *(UINT16 *)(* avalue);
122 break;
123
124 case FFI_TYPE_SINT32:
125 case FFI_TYPE_UINT32:
126 /* Note that unsigned 32-bit quantities are sign extended. */
127 *(SINT64 *) argp = *(SINT32 *)(* avalue);
128 break;
129
130 case FFI_TYPE_SINT64:
131 case FFI_TYPE_UINT64:
132 case FFI_TYPE_POINTER:
133 *(UINT64 *) argp = *(UINT64 *)(* avalue);
134 break;
135
136 case FFI_TYPE_FLOAT:
137 if (argp - stack < 6)
138 {
139 /* Note the conversion -- all the fp regs are loaded as
140 doubles. The in-register format is the same. */
141 *(double *) argp = *(float *)(* avalue);
142 }
143 else
144 *(float *) argp = *(float *)(* avalue);
145 break;
146
147 case FFI_TYPE_DOUBLE:
148 *(double *) argp = *(double *)(* avalue);
149 break;
150
151 case FFI_TYPE_LONGDOUBLE:
152 /* 128-bit long double is passed by reference. */
153 *(long double **) argp = (long double *)(* avalue);
154 size = sizeof (long double *);
155 break;
156
157 case FFI_TYPE_STRUCT:
158 memcpy(argp, *avalue, (*arg_types)->size);
159 break;
160
161 default:
162 FFI_ASSERT(0);
163 }
164
165 argp += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
166 i++, arg_types++, avalue++;
167 }
168
169 ffi_call_osf(stack, cif->bytes, cif->flags, rvalue, fn);
170 }
171
172
173 ffi_status
ffi_prep_closure_loc(ffi_closure * closure,ffi_cif * cif,void (* fun)(ffi_cif *,void *,void **,void *),void * user_data,void * codeloc)174 ffi_prep_closure_loc (ffi_closure* closure,
175 ffi_cif* cif,
176 void (*fun)(ffi_cif*, void*, void**, void*),
177 void *user_data,
178 void *codeloc)
179 {
180 unsigned int *tramp;
181
182 if (cif->abi != FFI_OSF)
183 return FFI_BAD_ABI;
184
185 tramp = (unsigned int *) &closure->tramp[0];
186 tramp[0] = 0x47fb0401; /* mov $27,$1 */
187 tramp[1] = 0xa77b0010; /* ldq $27,16($27) */
188 tramp[2] = 0x6bfb0000; /* jmp $31,($27),0 */
189 tramp[3] = 0x47ff041f; /* nop */
190 *(void **) &tramp[4] = ffi_closure_osf;
191
192 closure->cif = cif;
193 closure->fun = fun;
194 closure->user_data = user_data;
195
196 /* Flush the Icache.
197
198 Tru64 UNIX as doesn't understand the imb mnemonic, so use call_pal
199 instead, since both Compaq as and gas can handle it.
200
201 0x86 is PAL_imb in Tru64 UNIX <alpha/pal.h>. */
202 asm volatile ("call_pal 0x86" : : : "memory");
203
204 return FFI_OK;
205 }
206
207
208 long FFI_HIDDEN
ffi_closure_osf_inner(ffi_closure * closure,void * rvalue,unsigned long * argp)209 ffi_closure_osf_inner(ffi_closure *closure, void *rvalue, unsigned long *argp)
210 {
211 ffi_cif *cif;
212 void **avalue;
213 ffi_type **arg_types;
214 long i, avn, argn;
215
216 cif = closure->cif;
217 avalue = alloca(cif->nargs * sizeof(void *));
218
219 argn = 0;
220
221 /* Copy the caller's structure return address to that the closure
222 returns the data directly to the caller. */
223 if (cif->flags == FFI_TYPE_STRUCT)
224 {
225 rvalue = (void *) argp[0];
226 argn = 1;
227 }
228
229 i = 0;
230 avn = cif->nargs;
231 arg_types = cif->arg_types;
232
233 /* Grab the addresses of the arguments from the stack frame. */
234 while (i < avn)
235 {
236 size_t size = arg_types[i]->size;
237
238 switch (arg_types[i]->type)
239 {
240 case FFI_TYPE_SINT8:
241 case FFI_TYPE_UINT8:
242 case FFI_TYPE_SINT16:
243 case FFI_TYPE_UINT16:
244 case FFI_TYPE_SINT32:
245 case FFI_TYPE_UINT32:
246 case FFI_TYPE_SINT64:
247 case FFI_TYPE_UINT64:
248 case FFI_TYPE_POINTER:
249 case FFI_TYPE_STRUCT:
250 avalue[i] = &argp[argn];
251 break;
252
253 case FFI_TYPE_FLOAT:
254 if (argn < 6)
255 {
256 /* Floats coming from registers need conversion from double
257 back to float format. */
258 *(float *)&argp[argn - 6] = *(double *)&argp[argn - 6];
259 avalue[i] = &argp[argn - 6];
260 }
261 else
262 avalue[i] = &argp[argn];
263 break;
264
265 case FFI_TYPE_DOUBLE:
266 avalue[i] = &argp[argn - (argn < 6 ? 6 : 0)];
267 break;
268
269 case FFI_TYPE_LONGDOUBLE:
270 /* 128-bit long double is passed by reference. */
271 avalue[i] = (long double *) argp[argn];
272 size = sizeof (long double *);
273 break;
274
275 default:
276 abort ();
277 }
278
279 argn += ALIGN(size, FFI_SIZEOF_ARG) / FFI_SIZEOF_ARG;
280 i++;
281 }
282
283 /* Invoke the closure. */
284 closure->fun (cif, rvalue, avalue, closure->user_data);
285
286 /* Tell ffi_closure_osf how to perform return type promotions. */
287 return cif->rtype->type;
288 }
289