tests: virtio-9p: rename PCI configuration test
[qemu.git] / thunk.c
1 /*
2 * Generic thunking code to convert data between host and target CPU
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #include "qemu/osdep.h"
20
21 #include "qemu.h"
22 #include "exec/user/thunk.h"
23
24 //#define DEBUG
25
26 static unsigned int max_struct_entries;
27 StructEntry *struct_entries;
28
29 static const argtype *thunk_type_next_ptr(const argtype *type_ptr);
30
31 static inline const argtype *thunk_type_next(const argtype *type_ptr)
32 {
33 int type;
34
35 type = *type_ptr++;
36 switch(type) {
37 case TYPE_CHAR:
38 case TYPE_SHORT:
39 case TYPE_INT:
40 case TYPE_LONGLONG:
41 case TYPE_ULONGLONG:
42 case TYPE_LONG:
43 case TYPE_ULONG:
44 case TYPE_PTRVOID:
45 case TYPE_OLDDEVT:
46 return type_ptr;
47 case TYPE_PTR:
48 return thunk_type_next_ptr(type_ptr);
49 case TYPE_ARRAY:
50 return thunk_type_next_ptr(type_ptr + 1);
51 case TYPE_STRUCT:
52 return type_ptr + 1;
53 default:
54 return NULL;
55 }
56 }
57
58 static const argtype *thunk_type_next_ptr(const argtype *type_ptr)
59 {
60 return thunk_type_next(type_ptr);
61 }
62
63 void thunk_register_struct(int id, const char *name, const argtype *types)
64 {
65 const argtype *type_ptr;
66 StructEntry *se;
67 int nb_fields, offset, max_align, align, size, i, j;
68
69 assert(id < max_struct_entries);
70 se = struct_entries + id;
71
72 /* first we count the number of fields */
73 type_ptr = types;
74 nb_fields = 0;
75 while (*type_ptr != TYPE_NULL) {
76 type_ptr = thunk_type_next(type_ptr);
77 nb_fields++;
78 }
79 se->field_types = types;
80 se->nb_fields = nb_fields;
81 se->name = name;
82 #ifdef DEBUG
83 printf("struct %s: id=%d nb_fields=%d\n",
84 se->name, id, se->nb_fields);
85 #endif
86 /* now we can alloc the data */
87
88 for(i = 0;i < 2; i++) {
89 offset = 0;
90 max_align = 1;
91 se->field_offsets[i] = malloc(nb_fields * sizeof(int));
92 type_ptr = se->field_types;
93 for(j = 0;j < nb_fields; j++) {
94 size = thunk_type_size(type_ptr, i);
95 align = thunk_type_align(type_ptr, i);
96 offset = (offset + align - 1) & ~(align - 1);
97 se->field_offsets[i][j] = offset;
98 offset += size;
99 if (align > max_align)
100 max_align = align;
101 type_ptr = thunk_type_next(type_ptr);
102 }
103 offset = (offset + max_align - 1) & ~(max_align - 1);
104 se->size[i] = offset;
105 se->align[i] = max_align;
106 #ifdef DEBUG
107 printf("%s: size=%d align=%d\n",
108 i == THUNK_HOST ? "host" : "target", offset, max_align);
109 #endif
110 }
111 }
112
113 void thunk_register_struct_direct(int id, const char *name,
114 const StructEntry *se1)
115 {
116 StructEntry *se;
117
118 assert(id < max_struct_entries);
119 se = struct_entries + id;
120 *se = *se1;
121 se->name = name;
122 }
123
124
125 /* now we can define the main conversion functions */
126 const argtype *thunk_convert(void *dst, const void *src,
127 const argtype *type_ptr, int to_host)
128 {
129 int type;
130
131 type = *type_ptr++;
132 switch(type) {
133 case TYPE_CHAR:
134 *(uint8_t *)dst = *(uint8_t *)src;
135 break;
136 case TYPE_SHORT:
137 *(uint16_t *)dst = tswap16(*(uint16_t *)src);
138 break;
139 case TYPE_INT:
140 *(uint32_t *)dst = tswap32(*(uint32_t *)src);
141 break;
142 case TYPE_LONGLONG:
143 case TYPE_ULONGLONG:
144 *(uint64_t *)dst = tswap64(*(uint64_t *)src);
145 break;
146 #if HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 32
147 case TYPE_LONG:
148 case TYPE_ULONG:
149 case TYPE_PTRVOID:
150 *(uint32_t *)dst = tswap32(*(uint32_t *)src);
151 break;
152 #elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 32
153 case TYPE_LONG:
154 case TYPE_ULONG:
155 case TYPE_PTRVOID:
156 if (to_host) {
157 if (type == TYPE_LONG) {
158 /* sign extension */
159 *(uint64_t *)dst = (int32_t)tswap32(*(uint32_t *)src);
160 } else {
161 *(uint64_t *)dst = tswap32(*(uint32_t *)src);
162 }
163 } else {
164 *(uint32_t *)dst = tswap32(*(uint64_t *)src & 0xffffffff);
165 }
166 break;
167 #elif HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
168 case TYPE_LONG:
169 case TYPE_ULONG:
170 case TYPE_PTRVOID:
171 *(uint64_t *)dst = tswap64(*(uint64_t *)src);
172 break;
173 #elif HOST_LONG_BITS == 32 && TARGET_ABI_BITS == 64
174 case TYPE_LONG:
175 case TYPE_ULONG:
176 case TYPE_PTRVOID:
177 if (to_host) {
178 *(uint32_t *)dst = tswap64(*(uint64_t *)src);
179 } else {
180 if (type == TYPE_LONG) {
181 /* sign extension */
182 *(uint64_t *)dst = tswap64(*(int32_t *)src);
183 } else {
184 *(uint64_t *)dst = tswap64(*(uint32_t *)src);
185 }
186 }
187 break;
188 #else
189 #warning unsupported conversion
190 #endif
191 case TYPE_OLDDEVT:
192 {
193 uint64_t val = 0;
194 switch (thunk_type_size(type_ptr - 1, !to_host)) {
195 case 2:
196 val = *(uint16_t *)src;
197 break;
198 case 4:
199 val = *(uint32_t *)src;
200 break;
201 case 8:
202 val = *(uint64_t *)src;
203 break;
204 }
205 switch (thunk_type_size(type_ptr - 1, to_host)) {
206 case 2:
207 *(uint16_t *)dst = tswap16(val);
208 break;
209 case 4:
210 *(uint32_t *)dst = tswap32(val);
211 break;
212 case 8:
213 *(uint64_t *)dst = tswap64(val);
214 break;
215 }
216 break;
217 }
218 case TYPE_ARRAY:
219 {
220 int array_length, i, dst_size, src_size;
221 const uint8_t *s;
222 uint8_t *d;
223
224 array_length = *type_ptr++;
225 dst_size = thunk_type_size(type_ptr, to_host);
226 src_size = thunk_type_size(type_ptr, 1 - to_host);
227 d = dst;
228 s = src;
229 for(i = 0;i < array_length; i++) {
230 thunk_convert(d, s, type_ptr, to_host);
231 d += dst_size;
232 s += src_size;
233 }
234 type_ptr = thunk_type_next(type_ptr);
235 }
236 break;
237 case TYPE_STRUCT:
238 {
239 int i;
240 const StructEntry *se;
241 const uint8_t *s;
242 uint8_t *d;
243 const argtype *field_types;
244 const int *dst_offsets, *src_offsets;
245
246 assert(*type_ptr < max_struct_entries);
247 se = struct_entries + *type_ptr++;
248 if (se->convert[0] != NULL) {
249 /* specific conversion is needed */
250 (*se->convert[to_host])(dst, src);
251 } else {
252 /* standard struct conversion */
253 field_types = se->field_types;
254 dst_offsets = se->field_offsets[to_host];
255 src_offsets = se->field_offsets[1 - to_host];
256 d = dst;
257 s = src;
258 for(i = 0;i < se->nb_fields; i++) {
259 field_types = thunk_convert(d + dst_offsets[i],
260 s + src_offsets[i],
261 field_types, to_host);
262 }
263 }
264 }
265 break;
266 default:
267 fprintf(stderr, "Invalid type 0x%x\n", type);
268 break;
269 }
270 return type_ptr;
271 }
272
273 /* from em86 */
274
275 /* Utility function: Table-driven functions to translate bitmasks
276 * between host and target formats
277 */
278 unsigned int target_to_host_bitmask(unsigned int target_mask,
279 const bitmask_transtbl * trans_tbl)
280 {
281 const bitmask_transtbl *btp;
282 unsigned int host_mask = 0;
283
284 for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
285 if ((target_mask & btp->target_mask) == btp->target_bits) {
286 host_mask |= btp->host_bits;
287 }
288 }
289 return host_mask;
290 }
291
292 unsigned int host_to_target_bitmask(unsigned int host_mask,
293 const bitmask_transtbl * trans_tbl)
294 {
295 const bitmask_transtbl *btp;
296 unsigned int target_mask = 0;
297
298 for (btp = trans_tbl; btp->target_mask && btp->host_mask; btp++) {
299 if ((host_mask & btp->host_mask) == btp->host_bits) {
300 target_mask |= btp->target_bits;
301 }
302 }
303 return target_mask;
304 }
305
306 int thunk_type_size_array(const argtype *type_ptr, int is_host)
307 {
308 return thunk_type_size(type_ptr, is_host);
309 }
310
311 int thunk_type_align_array(const argtype *type_ptr, int is_host)
312 {
313 return thunk_type_align(type_ptr, is_host);
314 }
315
316 void thunk_init(unsigned int max_structs)
317 {
318 max_struct_entries = max_structs;
319 struct_entries = g_new0(StructEntry, max_structs);
320 }