Commit | Line | Data |
---|---|---|
d79865b9 MD |
1 | #ifndef _BABELTRACE_BITFIELD_H |
2 | #define _BABELTRACE_BITFIELD_H | |
6dc2ca62 MD |
3 | |
4 | /* | |
d79865b9 | 5 | * BabelTrace |
6dc2ca62 MD |
6 | * |
7 | * Bitfields read/write functions. | |
8 | * | |
9 | * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
10 | * | |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice shall be included in | |
19 | * all copies or substantial portions of the Software. | |
c462e188 MD |
20 | * |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
6dc2ca62 MD |
28 | */ |
29 | ||
30 | #include <stdint.h> /* C99 5.2.4.2 Numerical limits */ | |
3d9990ac | 31 | #include <babeltrace/compat/limits-internal.h> /* C99 5.2.4.2 Numerical limits */ |
3d9990ac | 32 | #include <babeltrace/endian-internal.h> /* Non-standard BIG_ENDIAN, LITTLE_ENDIAN, BYTE_ORDER */ |
6dc2ca62 | 33 | |
08228826 | 34 | /* We can't shift a int from 32 bit, >> 32 and << 32 on int is undefined */ |
5f61bf21 | 35 | #define _bt_piecewise_rshift(_v, _shift) \ |
6dc2ca62 | 36 | ({ \ |
5f61bf21 MD |
37 | typeof(_v) ___v = (_v); \ |
38 | typeof(_shift) ___shift = (_shift); \ | |
39 | unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1); \ | |
40 | unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \ | |
6dc2ca62 MD |
41 | \ |
42 | for (; sb; sb--) \ | |
5f61bf21 MD |
43 | ___v >>= sizeof(___v) * CHAR_BIT - 1; \ |
44 | ___v >>= final; \ | |
6dc2ca62 MD |
45 | }) |
46 | ||
5f61bf21 | 47 | #define _bt_piecewise_lshift(_v, _shift) \ |
08228826 | 48 | ({ \ |
5f61bf21 MD |
49 | typeof(_v) ___v = (_v); \ |
50 | typeof(_shift) ___shift = (_shift); \ | |
51 | unsigned long sb = (___shift) / (sizeof(___v) * CHAR_BIT - 1); \ | |
52 | unsigned long final = (___shift) % (sizeof(___v) * CHAR_BIT - 1); \ | |
08228826 MD |
53 | \ |
54 | for (; sb; sb--) \ | |
5f61bf21 MD |
55 | ___v <<= sizeof(___v) * CHAR_BIT - 1; \ |
56 | ___v <<= final; \ | |
08228826 MD |
57 | }) |
58 | ||
cca767be | 59 | #define _bt_is_signed_type(type) ((type) -1 < (type) 0) |
08228826 | 60 | |
a2d16120 PP |
61 | /* |
62 | * NOTE: The cast to (uint64_t) below ensures that we're not casting a | |
63 | * negative value, which is undefined in C. However, this limits the | |
64 | * maximum type size of `type` and `v` to 64-bit. The | |
65 | * _bt_check_max_64bit() is used to check that the users of this header | |
66 | * do not use types with a size greater than 64-bit. | |
67 | */ | |
d79865b9 | 68 | #define _bt_unsigned_cast(type, v) \ |
08228826 MD |
69 | ({ \ |
70 | (sizeof(v) < sizeof(type)) ? \ | |
a2d16120 | 71 | ((type) (v)) & ((type) (~(~(uint64_t) 0 << (sizeof(v) * CHAR_BIT)))) : \ |
08228826 MD |
72 | (type) (v); \ |
73 | }) | |
74 | ||
a2d16120 PP |
75 | #define _bt_check_max_64bit(type) \ |
76 | char _max_64bit_assertion[sizeof(type) <= sizeof(uint64_t) ? 1 : -1] __attribute__((unused)) | |
77 | ||
6dc2ca62 | 78 | /* |
d79865b9 | 79 | * bt_bitfield_write - write integer to a bitfield in native endianness |
6dc2ca62 MD |
80 | * |
81 | * Save integer to the bitfield, which starts at the "start" bit, has "len" | |
82 | * bits. | |
83 | * The inside of a bitfield is from high bits to low bits. | |
84 | * Uses native endianness. | |
85 | * For unsigned "v", pad MSB with 0 if bitfield is larger than v. | |
86 | * For signed "v", sign-extend v if bitfield is larger than v. | |
87 | * | |
88 | * On little endian, bytes are placed from the less significant to the most | |
89 | * significant. Also, consecutive bitfields are placed from lower bits to higher | |
90 | * bits. | |
91 | * | |
92 | * On big endian, bytes are places from most significant to less significant. | |
93 | * Also, consecutive bitfields are placed from higher to lower bits. | |
94 | */ | |
95 | ||
5f61bf21 | 96 | #define _bt_bitfield_write_le(_ptr, type, _start, _length, _v) \ |
6dc2ca62 | 97 | do { \ |
5f61bf21 | 98 | typeof(_v) __v = (_v); \ |
9128428b | 99 | type *__ptr = (void *) (_ptr); \ |
5f61bf21 | 100 | unsigned long __start = (_start), __length = (_length); \ |
47e0f2e2 MD |
101 | type mask, cmask; \ |
102 | unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \ | |
6dc2ca62 MD |
103 | unsigned long start_unit, end_unit, this_unit; \ |
104 | unsigned long end, cshift; /* cshift is "complement shift" */ \ | |
6dc2ca62 | 105 | \ |
5f61bf21 | 106 | if (!__length) \ |
6dc2ca62 MD |
107 | break; \ |
108 | \ | |
5f61bf21 MD |
109 | end = __start + __length; \ |
110 | start_unit = __start / ts; \ | |
6dc2ca62 MD |
111 | end_unit = (end + (ts - 1)) / ts; \ |
112 | \ | |
113 | /* Trim v high bits */ \ | |
5f61bf21 MD |
114 | if (__length < sizeof(__v) * CHAR_BIT) \ |
115 | __v &= ~((~(typeof(__v)) 0) << __length); \ | |
6dc2ca62 MD |
116 | \ |
117 | /* We can now append v with a simple "or", shift it piece-wise */ \ | |
118 | this_unit = start_unit; \ | |
119 | if (start_unit == end_unit - 1) { \ | |
5f61bf21 | 120 | mask = ~((~(type) 0) << (__start % ts)); \ |
6dc2ca62 | 121 | if (end % ts) \ |
47e0f2e2 | 122 | mask |= (~(type) 0) << (end % ts); \ |
5f61bf21 | 123 | cmask = (type) __v << (__start % ts); \ |
08228826 | 124 | cmask &= ~mask; \ |
5f61bf21 MD |
125 | __ptr[this_unit] &= mask; \ |
126 | __ptr[this_unit] |= cmask; \ | |
6dc2ca62 MD |
127 | break; \ |
128 | } \ | |
5f61bf21 MD |
129 | if (__start % ts) { \ |
130 | cshift = __start % ts; \ | |
47e0f2e2 | 131 | mask = ~((~(type) 0) << cshift); \ |
5f61bf21 | 132 | cmask = (type) __v << cshift; \ |
08228826 | 133 | cmask &= ~mask; \ |
5f61bf21 MD |
134 | __ptr[this_unit] &= mask; \ |
135 | __ptr[this_unit] |= cmask; \ | |
136 | __v = _bt_piecewise_rshift(__v, ts - cshift); \ | |
137 | __start += ts - cshift; \ | |
6dc2ca62 MD |
138 | this_unit++; \ |
139 | } \ | |
140 | for (; this_unit < end_unit - 1; this_unit++) { \ | |
5f61bf21 MD |
141 | __ptr[this_unit] = (type) __v; \ |
142 | __v = _bt_piecewise_rshift(__v, ts); \ | |
143 | __start += ts; \ | |
6dc2ca62 MD |
144 | } \ |
145 | if (end % ts) { \ | |
47e0f2e2 | 146 | mask = (~(type) 0) << (end % ts); \ |
5f61bf21 | 147 | cmask = (type) __v; \ |
08228826 | 148 | cmask &= ~mask; \ |
5f61bf21 MD |
149 | __ptr[this_unit] &= mask; \ |
150 | __ptr[this_unit] |= cmask; \ | |
6dc2ca62 | 151 | } else \ |
5f61bf21 | 152 | __ptr[this_unit] = (type) __v; \ |
6dc2ca62 MD |
153 | } while (0) |
154 | ||
5f61bf21 | 155 | #define _bt_bitfield_write_be(_ptr, type, _start, _length, _v) \ |
6dc2ca62 | 156 | do { \ |
5f61bf21 | 157 | typeof(_v) __v = (_v); \ |
9128428b | 158 | type *__ptr = (void *) (_ptr); \ |
5f61bf21 | 159 | unsigned long __start = (_start), __length = (_length); \ |
47e0f2e2 MD |
160 | type mask, cmask; \ |
161 | unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \ | |
6dc2ca62 MD |
162 | unsigned long start_unit, end_unit, this_unit; \ |
163 | unsigned long end, cshift; /* cshift is "complement shift" */ \ | |
6dc2ca62 | 164 | \ |
5f61bf21 | 165 | if (!__length) \ |
6dc2ca62 MD |
166 | break; \ |
167 | \ | |
5f61bf21 MD |
168 | end = __start + __length; \ |
169 | start_unit = __start / ts; \ | |
6dc2ca62 MD |
170 | end_unit = (end + (ts - 1)) / ts; \ |
171 | \ | |
172 | /* Trim v high bits */ \ | |
5f61bf21 MD |
173 | if (__length < sizeof(__v) * CHAR_BIT) \ |
174 | __v &= ~((~(typeof(__v)) 0) << __length); \ | |
6dc2ca62 MD |
175 | \ |
176 | /* We can now append v with a simple "or", shift it piece-wise */ \ | |
177 | this_unit = end_unit - 1; \ | |
178 | if (start_unit == end_unit - 1) { \ | |
47e0f2e2 | 179 | mask = ~((~(type) 0) << ((ts - (end % ts)) % ts)); \ |
5f61bf21 MD |
180 | if (__start % ts) \ |
181 | mask |= (~((type) 0)) << (ts - (__start % ts)); \ | |
182 | cmask = (type) __v << ((ts - (end % ts)) % ts); \ | |
08228826 | 183 | cmask &= ~mask; \ |
5f61bf21 MD |
184 | __ptr[this_unit] &= mask; \ |
185 | __ptr[this_unit] |= cmask; \ | |
6dc2ca62 MD |
186 | break; \ |
187 | } \ | |
188 | if (end % ts) { \ | |
189 | cshift = end % ts; \ | |
47e0f2e2 | 190 | mask = ~((~(type) 0) << (ts - cshift)); \ |
5f61bf21 | 191 | cmask = (type) __v << (ts - cshift); \ |
08228826 | 192 | cmask &= ~mask; \ |
5f61bf21 MD |
193 | __ptr[this_unit] &= mask; \ |
194 | __ptr[this_unit] |= cmask; \ | |
195 | __v = _bt_piecewise_rshift(__v, cshift); \ | |
6dc2ca62 MD |
196 | end -= cshift; \ |
197 | this_unit--; \ | |
198 | } \ | |
08228826 | 199 | for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \ |
5f61bf21 MD |
200 | __ptr[this_unit] = (type) __v; \ |
201 | __v = _bt_piecewise_rshift(__v, ts); \ | |
6dc2ca62 MD |
202 | end -= ts; \ |
203 | } \ | |
5f61bf21 MD |
204 | if (__start % ts) { \ |
205 | mask = (~(type) 0) << (ts - (__start % ts)); \ | |
206 | cmask = (type) __v; \ | |
08228826 | 207 | cmask &= ~mask; \ |
5f61bf21 MD |
208 | __ptr[this_unit] &= mask; \ |
209 | __ptr[this_unit] |= cmask; \ | |
6dc2ca62 | 210 | } else \ |
5f61bf21 | 211 | __ptr[this_unit] = (type) __v; \ |
6dc2ca62 MD |
212 | } while (0) |
213 | ||
214 | /* | |
d79865b9 MD |
215 | * bt_bitfield_write - write integer to a bitfield in native endianness |
216 | * bt_bitfield_write_le - write integer to a bitfield in little endian | |
217 | * bt_bitfield_write_be - write integer to a bitfield in big endian | |
6dc2ca62 MD |
218 | */ |
219 | ||
220 | #if (BYTE_ORDER == LITTLE_ENDIAN) | |
221 | ||
47e0f2e2 MD |
222 | #define bt_bitfield_write(ptr, type, _start, _length, _v) \ |
223 | _bt_bitfield_write_le(ptr, type, _start, _length, _v) | |
6dc2ca62 | 224 | |
47e0f2e2 MD |
225 | #define bt_bitfield_write_le(ptr, type, _start, _length, _v) \ |
226 | _bt_bitfield_write_le(ptr, type, _start, _length, _v) | |
a2d16120 | 227 | |
47e0f2e2 MD |
228 | #define bt_bitfield_write_be(ptr, type, _start, _length, _v) \ |
229 | _bt_bitfield_write_be(ptr, unsigned char, _start, _length, _v) | |
6dc2ca62 MD |
230 | |
231 | #elif (BYTE_ORDER == BIG_ENDIAN) | |
232 | ||
47e0f2e2 MD |
233 | #define bt_bitfield_write(ptr, type, _start, _length, _v) \ |
234 | _bt_bitfield_write_be(ptr, type, _start, _length, _v) | |
6dc2ca62 | 235 | |
47e0f2e2 MD |
236 | #define bt_bitfield_write_le(ptr, type, _start, _length, _v) \ |
237 | _bt_bitfield_write_le(ptr, unsigned char, _start, _length, _v) | |
a2d16120 | 238 | |
47e0f2e2 MD |
239 | #define bt_bitfield_write_be(ptr, type, _start, _length, _v) \ |
240 | _bt_bitfield_write_be(ptr, type, _start, _length, _v) | |
6dc2ca62 MD |
241 | |
242 | #else /* (BYTE_ORDER == PDP_ENDIAN) */ | |
243 | ||
244 | #error "Byte order not supported" | |
245 | ||
246 | #endif | |
247 | ||
5f61bf21 | 248 | #define _bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \ |
6dc2ca62 | 249 | do { \ |
5f61bf21 | 250 | typeof(*(_vptr)) *__vptr = (_vptr); \ |
5f61bf21 | 251 | typeof(*__vptr) __v; \ |
9128428b | 252 | type *__ptr = (void *) (_ptr); \ |
5f61bf21 | 253 | unsigned long __start = (_start), __length = (_length); \ |
47e0f2e2 MD |
254 | type mask, cmask; \ |
255 | unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \ | |
6dc2ca62 MD |
256 | unsigned long start_unit, end_unit, this_unit; \ |
257 | unsigned long end, cshift; /* cshift is "complement shift" */ \ | |
08228826 | 258 | \ |
a2d16120 PP |
259 | { _bt_check_max_64bit(type); } \ |
260 | { _bt_check_max_64bit(typeof(*_vptr)); } \ | |
261 | { _bt_check_max_64bit(typeof(*_ptr)); } \ | |
262 | \ | |
5f61bf21 MD |
263 | if (!__length) { \ |
264 | *__vptr = 0; \ | |
08228826 MD |
265 | break; \ |
266 | } \ | |
267 | \ | |
5f61bf21 MD |
268 | end = __start + __length; \ |
269 | start_unit = __start / ts; \ | |
08228826 | 270 | end_unit = (end + (ts - 1)) / ts; \ |
6a7b3345 MD |
271 | \ |
272 | this_unit = end_unit - 1; \ | |
5f61bf21 MD |
273 | if (_bt_is_signed_type(typeof(__v)) \ |
274 | && (__ptr[this_unit] & ((type) 1 << ((end % ts ? : ts) - 1)))) \ | |
275 | __v = ~(typeof(__v)) 0; \ | |
6a7b3345 | 276 | else \ |
5f61bf21 | 277 | __v = 0; \ |
6a7b3345 | 278 | if (start_unit == end_unit - 1) { \ |
5f61bf21 MD |
279 | cmask = __ptr[this_unit]; \ |
280 | cmask >>= (__start % ts); \ | |
281 | if ((end - __start) % ts) { \ | |
282 | mask = ~((~(type) 0) << (end - __start)); \ | |
6a7b3345 MD |
283 | cmask &= mask; \ |
284 | } \ | |
5f61bf21 MD |
285 | __v = _bt_piecewise_lshift(__v, end - __start); \ |
286 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
287 | *__vptr = __v; \ | |
6a7b3345 MD |
288 | break; \ |
289 | } \ | |
290 | if (end % ts) { \ | |
291 | cshift = end % ts; \ | |
47e0f2e2 | 292 | mask = ~((~(type) 0) << cshift); \ |
5f61bf21 | 293 | cmask = __ptr[this_unit]; \ |
6a7b3345 | 294 | cmask &= mask; \ |
5f61bf21 MD |
295 | __v = _bt_piecewise_lshift(__v, cshift); \ |
296 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
6a7b3345 MD |
297 | end -= cshift; \ |
298 | this_unit--; \ | |
299 | } \ | |
08228826 | 300 | for (; (long) this_unit >= (long) start_unit + 1; this_unit--) { \ |
5f61bf21 MD |
301 | __v = _bt_piecewise_lshift(__v, ts); \ |
302 | __v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\ | |
6a7b3345 MD |
303 | end -= ts; \ |
304 | } \ | |
5f61bf21 MD |
305 | if (__start % ts) { \ |
306 | mask = ~((~(type) 0) << (ts - (__start % ts))); \ | |
307 | cmask = __ptr[this_unit]; \ | |
308 | cmask >>= (__start % ts); \ | |
6a7b3345 | 309 | cmask &= mask; \ |
5f61bf21 MD |
310 | __v = _bt_piecewise_lshift(__v, ts - (__start % ts)); \ |
311 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
6a7b3345 | 312 | } else { \ |
5f61bf21 MD |
313 | __v = _bt_piecewise_lshift(__v, ts); \ |
314 | __v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\ | |
6a7b3345 | 315 | } \ |
5f61bf21 | 316 | *__vptr = __v; \ |
08228826 MD |
317 | } while (0) |
318 | ||
5f61bf21 | 319 | #define _bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \ |
08228826 | 320 | do { \ |
5f61bf21 | 321 | typeof(*(_vptr)) *__vptr = (_vptr); \ |
5f61bf21 | 322 | typeof(*__vptr) __v; \ |
9128428b | 323 | type *__ptr = (void *) (_ptr); \ |
5f61bf21 | 324 | unsigned long __start = (_start), __length = (_length); \ |
47e0f2e2 MD |
325 | type mask, cmask; \ |
326 | unsigned long ts = sizeof(type) * CHAR_BIT; /* type size */ \ | |
08228826 MD |
327 | unsigned long start_unit, end_unit, this_unit; \ |
328 | unsigned long end, cshift; /* cshift is "complement shift" */ \ | |
6dc2ca62 | 329 | \ |
a2d16120 PP |
330 | { _bt_check_max_64bit(type); } \ |
331 | { _bt_check_max_64bit(typeof(*_vptr)); } \ | |
332 | { _bt_check_max_64bit(typeof(*_ptr)); } \ | |
333 | \ | |
5f61bf21 MD |
334 | if (!__length) { \ |
335 | *__vptr = 0; \ | |
6dc2ca62 | 336 | break; \ |
08228826 | 337 | } \ |
6dc2ca62 | 338 | \ |
5f61bf21 MD |
339 | end = __start + __length; \ |
340 | start_unit = __start / ts; \ | |
6dc2ca62 | 341 | end_unit = (end + (ts - 1)) / ts; \ |
6a7b3345 | 342 | \ |
08228826 | 343 | this_unit = start_unit; \ |
5f61bf21 MD |
344 | if (_bt_is_signed_type(typeof(__v)) \ |
345 | && (__ptr[this_unit] & ((type) 1 << (ts - (__start % ts) - 1)))) \ | |
346 | __v = ~(typeof(__v)) 0; \ | |
6a7b3345 | 347 | else \ |
5f61bf21 | 348 | __v = 0; \ |
6a7b3345 | 349 | if (start_unit == end_unit - 1) { \ |
5f61bf21 | 350 | cmask = __ptr[this_unit]; \ |
6a7b3345 | 351 | cmask >>= (ts - (end % ts)) % ts; \ |
5f61bf21 MD |
352 | if ((end - __start) % ts) { \ |
353 | mask = ~((~(type) 0) << (end - __start)); \ | |
6a7b3345 MD |
354 | cmask &= mask; \ |
355 | } \ | |
5f61bf21 MD |
356 | __v = _bt_piecewise_lshift(__v, end - __start); \ |
357 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
358 | *__vptr = __v; \ | |
6a7b3345 MD |
359 | break; \ |
360 | } \ | |
5f61bf21 MD |
361 | if (__start % ts) { \ |
362 | cshift = __start % ts; \ | |
47e0f2e2 | 363 | mask = ~((~(type) 0) << (ts - cshift)); \ |
5f61bf21 | 364 | cmask = __ptr[this_unit]; \ |
6a7b3345 | 365 | cmask &= mask; \ |
5f61bf21 MD |
366 | __v = _bt_piecewise_lshift(__v, ts - cshift); \ |
367 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
368 | __start += ts - cshift; \ | |
6a7b3345 MD |
369 | this_unit++; \ |
370 | } \ | |
371 | for (; this_unit < end_unit - 1; this_unit++) { \ | |
5f61bf21 MD |
372 | __v = _bt_piecewise_lshift(__v, ts); \ |
373 | __v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\ | |
374 | __start += ts; \ | |
6a7b3345 MD |
375 | } \ |
376 | if (end % ts) { \ | |
47e0f2e2 | 377 | mask = ~((~(type) 0) << (end % ts)); \ |
5f61bf21 | 378 | cmask = __ptr[this_unit]; \ |
6a7b3345 MD |
379 | cmask >>= ts - (end % ts); \ |
380 | cmask &= mask; \ | |
5f61bf21 MD |
381 | __v = _bt_piecewise_lshift(__v, end % ts); \ |
382 | __v |= _bt_unsigned_cast(typeof(__v), cmask); \ | |
6a7b3345 | 383 | } else { \ |
5f61bf21 MD |
384 | __v = _bt_piecewise_lshift(__v, ts); \ |
385 | __v |= _bt_unsigned_cast(typeof(__v), __ptr[this_unit]);\ | |
6a7b3345 | 386 | } \ |
5f61bf21 | 387 | *__vptr = __v; \ |
6dc2ca62 MD |
388 | } while (0) |
389 | ||
6dc2ca62 | 390 | /* |
d79865b9 MD |
391 | * bt_bitfield_read - read integer from a bitfield in native endianness |
392 | * bt_bitfield_read_le - read integer from a bitfield in little endian | |
393 | * bt_bitfield_read_be - read integer from a bitfield in big endian | |
6dc2ca62 MD |
394 | */ |
395 | ||
08228826 MD |
396 | #if (BYTE_ORDER == LITTLE_ENDIAN) |
397 | ||
5f61bf21 MD |
398 | #define bt_bitfield_read(_ptr, type, _start, _length, _vptr) \ |
399 | _bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) | |
08228826 | 400 | |
5f61bf21 MD |
401 | #define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \ |
402 | _bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) | |
a2d16120 | 403 | |
5f61bf21 MD |
404 | #define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \ |
405 | _bt_bitfield_read_be(_ptr, unsigned char, _start, _length, _vptr) | |
08228826 MD |
406 | |
407 | #elif (BYTE_ORDER == BIG_ENDIAN) | |
408 | ||
5f61bf21 MD |
409 | #define bt_bitfield_read(_ptr, type, _start, _length, _vptr) \ |
410 | _bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) | |
08228826 | 411 | |
5f61bf21 MD |
412 | #define bt_bitfield_read_le(_ptr, type, _start, _length, _vptr) \ |
413 | _bt_bitfield_read_le(_ptr, unsigned char, _start, _length, _vptr) | |
a2d16120 | 414 | |
5f61bf21 MD |
415 | #define bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) \ |
416 | _bt_bitfield_read_be(_ptr, type, _start, _length, _vptr) | |
08228826 MD |
417 | |
418 | #else /* (BYTE_ORDER == PDP_ENDIAN) */ | |
419 | ||
420 | #error "Byte order not supported" | |
421 | ||
422 | #endif | |
6dc2ca62 | 423 | |
d79865b9 | 424 | #endif /* _BABELTRACE_BITFIELD_H */ |