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7c673cae FG |
1 | /* |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * Copyright (c) 2009 Helge Bahmann | |
7 | * Copyright (c) 2013 Tim Blechmann | |
8 | * Copyright (c) 2014 Andrey Semashev | |
9 | */ | |
10 | /*! | |
11 | * \file atomic/detail/ops_gcc_arm.hpp | |
12 | * | |
13 | * This header contains implementation of the \c operations template. | |
14 | */ | |
15 | ||
16 | #ifndef BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_HPP_INCLUDED_ | |
17 | #define BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_HPP_INCLUDED_ | |
18 | ||
b32b8144 | 19 | #include <cstddef> |
7c673cae FG |
20 | #include <boost/cstdint.hpp> |
21 | #include <boost/memory_order.hpp> | |
22 | #include <boost/atomic/detail/config.hpp> | |
23 | #include <boost/atomic/detail/storage_type.hpp> | |
11fdf7f2 | 24 | #include <boost/atomic/detail/integral_extend.hpp> |
7c673cae | 25 | #include <boost/atomic/detail/operations_fwd.hpp> |
b32b8144 | 26 | #include <boost/atomic/detail/ops_gcc_arm_common.hpp> |
7c673cae FG |
27 | #include <boost/atomic/capabilities.hpp> |
28 | ||
29 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
30 | #pragma once | |
31 | #endif | |
32 | ||
33 | namespace boost { | |
34 | namespace atomics { | |
35 | namespace detail { | |
36 | ||
37 | // From the ARM Architecture Reference Manual for architecture v6: | |
38 | // | |
39 | // LDREX{<cond>} <Rd>, [<Rn>] | |
40 | // <Rd> Specifies the destination register for the memory word addressed by <Rd> | |
41 | // <Rn> Specifies the register containing the address. | |
42 | // | |
43 | // STREX{<cond>} <Rd>, <Rm>, [<Rn>] | |
44 | // <Rd> Specifies the destination register for the returned status value. | |
45 | // 0 if the operation updates memory | |
46 | // 1 if the operation fails to update memory | |
47 | // <Rm> Specifies the register containing the word to be stored to memory. | |
48 | // <Rn> Specifies the register containing the address. | |
49 | // Rd must not be the same register as Rm or Rn. | |
50 | // | |
51 | // ARM v7 is like ARM v6 plus: | |
52 | // There are half-word and byte versions of the LDREX and STREX instructions, | |
53 | // LDREXH, LDREXB, STREXH and STREXB. | |
54 | // There are also double-word versions, LDREXD and STREXD. | |
55 | // (Actually it looks like these are available from version 6k onwards.) | |
56 | // FIXME these are not yet used; should be mostly a matter of copy-and-paste. | |
57 | // I think you can supply an immediate offset to the address. | |
7c673cae FG |
58 | |
59 | template< bool Signed > | |
60 | struct operations< 4u, Signed > : | |
61 | public gcc_arm_operations_base | |
62 | { | |
11fdf7f2 TL |
63 | typedef typename make_storage_type< 4u >::type storage_type; |
64 | typedef typename make_storage_type< 4u >::aligned aligned_storage_type; | |
7c673cae | 65 | |
b32b8144 FG |
66 | static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 4u; |
67 | static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed; | |
68 | ||
7c673cae FG |
69 | static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT |
70 | { | |
71 | fence_before(order); | |
72 | storage = v; | |
73 | fence_after_store(order); | |
74 | } | |
75 | ||
76 | static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT | |
77 | { | |
78 | storage_type v = storage; | |
79 | fence_after(order); | |
80 | return v; | |
81 | } | |
82 | ||
83 | static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
84 | { | |
85 | storage_type original; | |
86 | fence_before(order); | |
87 | uint32_t tmp; | |
88 | __asm__ __volatile__ | |
89 | ( | |
90 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
91 | "1:\n" | |
92 | "ldrex %[original], %[storage]\n" // load the original value | |
93 | "strex %[tmp], %[value], %[storage]\n" // store the replacement, tmp = store failed | |
94 | "teq %[tmp], #0\n" // check if store succeeded | |
95 | "bne 1b\n" | |
96 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
97 | : [tmp] "=&l" (tmp), [original] "=&r" (original), [storage] "+Q" (storage) | |
98 | : [value] "r" (v) | |
99 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC | |
100 | ); | |
101 | fence_after(order); | |
102 | return original; | |
103 | } | |
104 | ||
105 | static BOOST_FORCEINLINE bool compare_exchange_weak( | |
106 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
107 | { | |
108 | fence_before(success_order); | |
109 | uint32_t success; | |
110 | uint32_t tmp; | |
111 | storage_type original; | |
112 | __asm__ __volatile__ | |
113 | ( | |
114 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
115 | "mov %[success], #0\n" // success = 0 | |
116 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
117 | "cmp %[original], %[expected]\n" // flags = original==expected | |
118 | "itt eq\n" // [hint that the following 2 instructions are conditional on flags.equal] | |
119 | "strexeq %[success], %[desired], %[storage]\n" // if (flags.equal) *(&storage) = desired, success = store failed | |
120 | "eoreq %[success], %[success], #1\n" // if (flags.equal) success ^= 1 (i.e. make it 1 if store succeeded) | |
121 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
122 | : [original] "=&r" (original), // %0 | |
123 | [success] "=&r" (success), // %1 | |
124 | [tmp] "=&l" (tmp), // %2 | |
125 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 126 | : [expected] "Ir" (expected), // %4 |
7c673cae FG |
127 | [desired] "r" (desired) // %5 |
128 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC | |
129 | ); | |
130 | if (success) | |
131 | fence_after(success_order); | |
132 | else | |
133 | fence_after(failure_order); | |
134 | expected = original; | |
135 | return !!success; | |
136 | } | |
137 | ||
138 | static BOOST_FORCEINLINE bool compare_exchange_strong( | |
139 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
140 | { | |
141 | fence_before(success_order); | |
142 | uint32_t success; | |
143 | uint32_t tmp; | |
144 | storage_type original; | |
145 | __asm__ __volatile__ | |
146 | ( | |
147 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
148 | "mov %[success], #0\n" // success = 0 | |
149 | "1:\n" | |
150 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
151 | "cmp %[original], %[expected]\n" // flags = original==expected | |
152 | "bne 2f\n" // if (!flags.equal) goto end | |
153 | "strex %[success], %[desired], %[storage]\n" // *(&storage) = desired, success = store failed | |
154 | "eors %[success], %[success], #1\n" // success ^= 1 (i.e. make it 1 if store succeeded); flags.equal = success == 0 | |
155 | "beq 1b\n" // if (flags.equal) goto retry | |
156 | "2:\n" | |
157 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
158 | : [original] "=&r" (original), // %0 | |
159 | [success] "=&r" (success), // %1 | |
160 | [tmp] "=&l" (tmp), // %2 | |
161 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 162 | : [expected] "Ir" (expected), // %4 |
7c673cae FG |
163 | [desired] "r" (desired) // %5 |
164 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC | |
165 | ); | |
166 | if (success) | |
167 | fence_after(success_order); | |
168 | else | |
169 | fence_after(failure_order); | |
170 | expected = original; | |
171 | return !!success; | |
172 | } | |
173 | ||
174 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
175 | { | |
176 | fence_before(order); | |
177 | uint32_t tmp; | |
178 | storage_type original, result; | |
179 | __asm__ __volatile__ | |
180 | ( | |
181 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
182 | "1:\n" | |
183 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
184 | "add %[result], %[original], %[value]\n" // result = original + value | |
185 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
186 | "teq %[tmp], #0\n" // flags = tmp==0 | |
187 | "bne 1b\n" // if (!flags.equal) goto retry | |
188 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
189 | : [original] "=&r" (original), // %0 | |
190 | [result] "=&r" (result), // %1 | |
191 | [tmp] "=&l" (tmp), // %2 | |
192 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 193 | : [value] "Ir" (v) // %4 |
7c673cae FG |
194 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
195 | ); | |
196 | fence_after(order); | |
197 | return original; | |
198 | } | |
199 | ||
200 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
201 | { | |
202 | fence_before(order); | |
203 | uint32_t tmp; | |
204 | storage_type original, result; | |
205 | __asm__ __volatile__ | |
206 | ( | |
207 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
208 | "1:\n" | |
209 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
210 | "sub %[result], %[original], %[value]\n" // result = original - value | |
211 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
212 | "teq %[tmp], #0\n" // flags = tmp==0 | |
213 | "bne 1b\n" // if (!flags.equal) goto retry | |
214 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
215 | : [original] "=&r" (original), // %0 | |
216 | [result] "=&r" (result), // %1 | |
217 | [tmp] "=&l" (tmp), // %2 | |
218 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 219 | : [value] "Ir" (v) // %4 |
7c673cae FG |
220 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
221 | ); | |
222 | fence_after(order); | |
223 | return original; | |
224 | } | |
225 | ||
226 | static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
227 | { | |
228 | fence_before(order); | |
229 | uint32_t tmp; | |
230 | storage_type original, result; | |
231 | __asm__ __volatile__ | |
232 | ( | |
233 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
234 | "1:\n" | |
235 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
236 | "and %[result], %[original], %[value]\n" // result = original & value | |
237 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
238 | "teq %[tmp], #0\n" // flags = tmp==0 | |
239 | "bne 1b\n" // if (!flags.equal) goto retry | |
240 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
241 | : [original] "=&r" (original), // %0 | |
242 | [result] "=&r" (result), // %1 | |
243 | [tmp] "=&l" (tmp), // %2 | |
244 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 245 | : [value] "Ir" (v) // %4 |
7c673cae FG |
246 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
247 | ); | |
248 | fence_after(order); | |
249 | return original; | |
250 | } | |
251 | ||
252 | static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
253 | { | |
254 | fence_before(order); | |
255 | uint32_t tmp; | |
256 | storage_type original, result; | |
257 | __asm__ __volatile__ | |
258 | ( | |
259 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
260 | "1:\n" | |
261 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
262 | "orr %[result], %[original], %[value]\n" // result = original | value | |
263 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
264 | "teq %[tmp], #0\n" // flags = tmp==0 | |
265 | "bne 1b\n" // if (!flags.equal) goto retry | |
266 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
267 | : [original] "=&r" (original), // %0 | |
268 | [result] "=&r" (result), // %1 | |
269 | [tmp] "=&l" (tmp), // %2 | |
270 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 271 | : [value] "Ir" (v) // %4 |
7c673cae FG |
272 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
273 | ); | |
274 | fence_after(order); | |
275 | return original; | |
276 | } | |
277 | ||
278 | static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
279 | { | |
280 | fence_before(order); | |
281 | uint32_t tmp; | |
282 | storage_type original, result; | |
283 | __asm__ __volatile__ | |
284 | ( | |
285 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
286 | "1:\n" | |
287 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
288 | "eor %[result], %[original], %[value]\n" // result = original ^ value | |
289 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
290 | "teq %[tmp], #0\n" // flags = tmp==0 | |
291 | "bne 1b\n" // if (!flags.equal) goto retry | |
292 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
293 | : [original] "=&r" (original), // %0 | |
294 | [result] "=&r" (result), // %1 | |
295 | [tmp] "=&l" (tmp), // %2 | |
296 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 297 | : [value] "Ir" (v) // %4 |
7c673cae FG |
298 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
299 | ); | |
300 | fence_after(order); | |
301 | return original; | |
302 | } | |
303 | ||
304 | static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
305 | { | |
306 | return !!exchange(storage, (storage_type)1, order); | |
307 | } | |
308 | ||
309 | static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
310 | { | |
311 | store(storage, 0, order); | |
312 | } | |
b32b8144 FG |
313 | }; |
314 | ||
315 | #if defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXB_STREXB) | |
316 | ||
317 | template< bool Signed > | |
318 | struct operations< 1u, Signed > : | |
319 | public gcc_arm_operations_base | |
320 | { | |
11fdf7f2 TL |
321 | typedef typename make_storage_type< 1u >::type storage_type; |
322 | typedef typename make_storage_type< 1u >::aligned aligned_storage_type; | |
323 | typedef typename make_storage_type< 4u >::type extended_storage_type; | |
b32b8144 FG |
324 | |
325 | static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 1u; | |
326 | static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed; | |
327 | ||
328 | static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
329 | { | |
330 | fence_before(order); | |
331 | storage = v; | |
332 | fence_after_store(order); | |
333 | } | |
334 | ||
335 | static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT | |
336 | { | |
337 | storage_type v = storage; | |
338 | fence_after(order); | |
339 | return v; | |
340 | } | |
341 | ||
342 | static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
343 | { | |
344 | extended_storage_type original; | |
345 | fence_before(order); | |
346 | uint32_t tmp; | |
347 | __asm__ __volatile__ | |
348 | ( | |
349 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
350 | "1:\n" | |
11fdf7f2 | 351 | "ldrexb %[original], %[storage]\n" // load the original value and zero-extend to 32 bits |
b32b8144 FG |
352 | "strexb %[tmp], %[value], %[storage]\n" // store the replacement, tmp = store failed |
353 | "teq %[tmp], #0\n" // check if store succeeded | |
354 | "bne 1b\n" | |
355 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
356 | : [tmp] "=&l" (tmp), [original] "=&r" (original), [storage] "+Q" (storage) | |
11fdf7f2 | 357 | : [value] "r" (v) |
b32b8144 FG |
358 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
359 | ); | |
360 | fence_after(order); | |
361 | return static_cast< storage_type >(original); | |
362 | } | |
363 | ||
364 | static BOOST_FORCEINLINE bool compare_exchange_weak( | |
365 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
366 | { | |
367 | fence_before(success_order); | |
368 | uint32_t success; | |
369 | uint32_t tmp; | |
370 | extended_storage_type original; | |
371 | __asm__ __volatile__ | |
372 | ( | |
373 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
374 | "mov %[success], #0\n" // success = 0 | |
11fdf7f2 | 375 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
376 | "cmp %[original], %[expected]\n" // flags = original==expected |
377 | "itt eq\n" // [hint that the following 2 instructions are conditional on flags.equal] | |
378 | "strexbeq %[success], %[desired], %[storage]\n" // if (flags.equal) *(&storage) = desired, success = store failed | |
379 | "eoreq %[success], %[success], #1\n" // if (flags.equal) success ^= 1 (i.e. make it 1 if store succeeded) | |
380 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
381 | : [original] "=&r" (original), // %0 | |
382 | [success] "=&r" (success), // %1 | |
383 | [tmp] "=&l" (tmp), // %2 | |
384 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 TL |
385 | : [expected] "Ir" (atomics::detail::zero_extend< extended_storage_type >(expected)), // %4 |
386 | [desired] "r" (desired) // %5 | |
b32b8144 FG |
387 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
388 | ); | |
389 | if (success) | |
390 | fence_after(success_order); | |
391 | else | |
392 | fence_after(failure_order); | |
393 | expected = static_cast< storage_type >(original); | |
394 | return !!success; | |
395 | } | |
396 | ||
397 | static BOOST_FORCEINLINE bool compare_exchange_strong( | |
398 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
399 | { | |
400 | fence_before(success_order); | |
401 | uint32_t success; | |
402 | uint32_t tmp; | |
403 | extended_storage_type original; | |
404 | __asm__ __volatile__ | |
405 | ( | |
406 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
407 | "mov %[success], #0\n" // success = 0 | |
408 | "1:\n" | |
11fdf7f2 | 409 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
410 | "cmp %[original], %[expected]\n" // flags = original==expected |
411 | "bne 2f\n" // if (!flags.equal) goto end | |
412 | "strexb %[success], %[desired], %[storage]\n" // *(&storage) = desired, success = store failed | |
413 | "eors %[success], %[success], #1\n" // success ^= 1 (i.e. make it 1 if store succeeded); flags.equal = success == 0 | |
414 | "beq 1b\n" // if (flags.equal) goto retry | |
415 | "2:\n" | |
416 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
417 | : [original] "=&r" (original), // %0 | |
418 | [success] "=&r" (success), // %1 | |
419 | [tmp] "=&l" (tmp), // %2 | |
420 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 TL |
421 | : [expected] "Ir" (atomics::detail::zero_extend< extended_storage_type >(expected)), // %4 |
422 | [desired] "r" (desired) // %5 | |
b32b8144 FG |
423 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
424 | ); | |
425 | if (success) | |
426 | fence_after(success_order); | |
427 | else | |
428 | fence_after(failure_order); | |
429 | expected = static_cast< storage_type >(original); | |
430 | return !!success; | |
431 | } | |
432 | ||
433 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
434 | { | |
435 | fence_before(order); | |
436 | uint32_t tmp; | |
437 | extended_storage_type original, result; | |
438 | __asm__ __volatile__ | |
439 | ( | |
440 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
441 | "1:\n" | |
11fdf7f2 | 442 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
443 | "add %[result], %[original], %[value]\n" // result = original + value |
444 | "strexb %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
445 | "teq %[tmp], #0\n" // flags = tmp==0 | |
446 | "bne 1b\n" // if (!flags.equal) goto retry | |
447 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
448 | : [original] "=&r" (original), // %0 | |
449 | [result] "=&r" (result), // %1 | |
450 | [tmp] "=&l" (tmp), // %2 | |
451 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 452 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
453 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
454 | ); | |
455 | fence_after(order); | |
456 | return static_cast< storage_type >(original); | |
457 | } | |
458 | ||
459 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
460 | { | |
461 | fence_before(order); | |
462 | uint32_t tmp; | |
463 | extended_storage_type original, result; | |
464 | __asm__ __volatile__ | |
465 | ( | |
466 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
467 | "1:\n" | |
11fdf7f2 | 468 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
469 | "sub %[result], %[original], %[value]\n" // result = original - value |
470 | "strexb %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
471 | "teq %[tmp], #0\n" // flags = tmp==0 | |
472 | "bne 1b\n" // if (!flags.equal) goto retry | |
473 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
474 | : [original] "=&r" (original), // %0 | |
475 | [result] "=&r" (result), // %1 | |
476 | [tmp] "=&l" (tmp), // %2 | |
477 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 478 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
479 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
480 | ); | |
481 | fence_after(order); | |
482 | return static_cast< storage_type >(original); | |
483 | } | |
484 | ||
485 | static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
486 | { | |
487 | fence_before(order); | |
488 | uint32_t tmp; | |
489 | extended_storage_type original, result; | |
490 | __asm__ __volatile__ | |
491 | ( | |
492 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
493 | "1:\n" | |
11fdf7f2 | 494 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
495 | "and %[result], %[original], %[value]\n" // result = original & value |
496 | "strexb %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
497 | "teq %[tmp], #0\n" // flags = tmp==0 | |
498 | "bne 1b\n" // if (!flags.equal) goto retry | |
499 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
500 | : [original] "=&r" (original), // %0 | |
501 | [result] "=&r" (result), // %1 | |
502 | [tmp] "=&l" (tmp), // %2 | |
503 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 504 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
505 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
506 | ); | |
507 | fence_after(order); | |
508 | return static_cast< storage_type >(original); | |
509 | } | |
510 | ||
511 | static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
512 | { | |
513 | fence_before(order); | |
514 | uint32_t tmp; | |
515 | extended_storage_type original, result; | |
516 | __asm__ __volatile__ | |
517 | ( | |
518 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
519 | "1:\n" | |
11fdf7f2 | 520 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
521 | "orr %[result], %[original], %[value]\n" // result = original | value |
522 | "strexb %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
523 | "teq %[tmp], #0\n" // flags = tmp==0 | |
524 | "bne 1b\n" // if (!flags.equal) goto retry | |
525 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
526 | : [original] "=&r" (original), // %0 | |
527 | [result] "=&r" (result), // %1 | |
528 | [tmp] "=&l" (tmp), // %2 | |
529 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 530 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
531 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
532 | ); | |
533 | fence_after(order); | |
534 | return static_cast< storage_type >(original); | |
535 | } | |
536 | ||
537 | static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
538 | { | |
539 | fence_before(order); | |
540 | uint32_t tmp; | |
541 | extended_storage_type original, result; | |
542 | __asm__ __volatile__ | |
543 | ( | |
544 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
545 | "1:\n" | |
11fdf7f2 | 546 | "ldrexb %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
547 | "eor %[result], %[original], %[value]\n" // result = original ^ value |
548 | "strexb %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
549 | "teq %[tmp], #0\n" // flags = tmp==0 | |
550 | "bne 1b\n" // if (!flags.equal) goto retry | |
551 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
552 | : [original] "=&r" (original), // %0 | |
553 | [result] "=&r" (result), // %1 | |
554 | [tmp] "=&l" (tmp), // %2 | |
555 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 556 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
557 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
558 | ); | |
559 | fence_after(order); | |
560 | return static_cast< storage_type >(original); | |
561 | } | |
7c673cae | 562 | |
b32b8144 | 563 | static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT |
7c673cae | 564 | { |
b32b8144 FG |
565 | return !!exchange(storage, (storage_type)1, order); |
566 | } | |
567 | ||
568 | static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
569 | { | |
570 | store(storage, 0, order); | |
7c673cae FG |
571 | } |
572 | }; | |
573 | ||
b32b8144 | 574 | #else // defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXB_STREXB) |
7c673cae FG |
575 | |
576 | template< > | |
577 | struct operations< 1u, false > : | |
578 | public operations< 4u, false > | |
579 | { | |
580 | typedef operations< 4u, false > base_type; | |
581 | typedef base_type::storage_type storage_type; | |
582 | ||
583 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
584 | { | |
585 | fence_before(order); | |
586 | uint32_t tmp; | |
587 | storage_type original, result; | |
588 | __asm__ __volatile__ | |
589 | ( | |
590 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
591 | "1:\n" | |
592 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
593 | "add %[result], %[original], %[value]\n" // result = original + value | |
594 | "uxtb %[result], %[result]\n" // zero extend result from 8 to 32 bits | |
595 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
596 | "teq %[tmp], #0\n" // flags = tmp==0 | |
597 | "bne 1b\n" // if (!flags.equal) goto retry | |
598 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
599 | : [original] "=&r" (original), // %0 | |
600 | [result] "=&r" (result), // %1 | |
601 | [tmp] "=&l" (tmp), // %2 | |
602 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 603 | : [value] "Ir" (v) // %4 |
7c673cae FG |
604 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
605 | ); | |
606 | fence_after(order); | |
607 | return original; | |
608 | } | |
609 | ||
610 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
611 | { | |
612 | fence_before(order); | |
613 | uint32_t tmp; | |
614 | storage_type original, result; | |
615 | __asm__ __volatile__ | |
616 | ( | |
617 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
618 | "1:\n" | |
619 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
620 | "sub %[result], %[original], %[value]\n" // result = original - value | |
621 | "uxtb %[result], %[result]\n" // zero extend result from 8 to 32 bits | |
622 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
623 | "teq %[tmp], #0\n" // flags = tmp==0 | |
624 | "bne 1b\n" // if (!flags.equal) goto retry | |
625 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
626 | : [original] "=&r" (original), // %0 | |
627 | [result] "=&r" (result), // %1 | |
628 | [tmp] "=&l" (tmp), // %2 | |
629 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 630 | : [value] "Ir" (v) // %4 |
7c673cae FG |
631 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
632 | ); | |
633 | fence_after(order); | |
634 | return original; | |
635 | } | |
636 | }; | |
637 | ||
638 | template< > | |
639 | struct operations< 1u, true > : | |
640 | public operations< 4u, true > | |
641 | { | |
642 | typedef operations< 4u, true > base_type; | |
643 | typedef base_type::storage_type storage_type; | |
644 | ||
645 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
646 | { | |
647 | fence_before(order); | |
648 | uint32_t tmp; | |
649 | storage_type original, result; | |
650 | __asm__ __volatile__ | |
651 | ( | |
652 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
653 | "1:\n" | |
654 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
655 | "add %[result], %[original], %[value]\n" // result = original + value | |
656 | "sxtb %[result], %[result]\n" // sign extend result from 8 to 32 bits | |
657 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
658 | "teq %[tmp], #0\n" // flags = tmp==0 | |
659 | "bne 1b\n" // if (!flags.equal) goto retry | |
660 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
661 | : [original] "=&r" (original), // %0 | |
662 | [result] "=&r" (result), // %1 | |
663 | [tmp] "=&l" (tmp), // %2 | |
664 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 665 | : [value] "Ir" (v) // %4 |
7c673cae FG |
666 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
667 | ); | |
668 | fence_after(order); | |
669 | return original; | |
670 | } | |
671 | ||
672 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
673 | { | |
674 | fence_before(order); | |
675 | uint32_t tmp; | |
676 | storage_type original, result; | |
677 | __asm__ __volatile__ | |
678 | ( | |
679 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
680 | "1:\n" | |
681 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
682 | "sub %[result], %[original], %[value]\n" // result = original - value | |
683 | "sxtb %[result], %[result]\n" // sign extend result from 8 to 32 bits | |
684 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
685 | "teq %[tmp], #0\n" // flags = tmp==0 | |
686 | "bne 1b\n" // if (!flags.equal) goto retry | |
687 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
688 | : [original] "=&r" (original), // %0 | |
689 | [result] "=&r" (result), // %1 | |
690 | [tmp] "=&l" (tmp), // %2 | |
691 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 692 | : [value] "Ir" (v) // %4 |
7c673cae FG |
693 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
694 | ); | |
695 | fence_after(order); | |
696 | return original; | |
697 | } | |
698 | }; | |
699 | ||
b32b8144 FG |
700 | #endif // defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXB_STREXB) |
701 | ||
702 | #if defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXH_STREXH) | |
703 | ||
704 | template< bool Signed > | |
705 | struct operations< 2u, Signed > : | |
706 | public gcc_arm_operations_base | |
707 | { | |
11fdf7f2 TL |
708 | typedef typename make_storage_type< 2u >::type storage_type; |
709 | typedef typename make_storage_type< 2u >::aligned aligned_storage_type; | |
710 | typedef typename make_storage_type< 4u >::type extended_storage_type; | |
b32b8144 FG |
711 | |
712 | static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 2u; | |
713 | static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed; | |
714 | ||
715 | static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
716 | { | |
717 | fence_before(order); | |
718 | storage = v; | |
719 | fence_after_store(order); | |
720 | } | |
721 | ||
722 | static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT | |
723 | { | |
724 | storage_type v = storage; | |
725 | fence_after(order); | |
726 | return v; | |
727 | } | |
728 | ||
729 | static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
730 | { | |
731 | extended_storage_type original; | |
732 | fence_before(order); | |
733 | uint32_t tmp; | |
734 | __asm__ __volatile__ | |
735 | ( | |
736 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
737 | "1:\n" | |
11fdf7f2 | 738 | "ldrexh %[original], %[storage]\n" // load the original value and zero-extend to 32 bits |
b32b8144 FG |
739 | "strexh %[tmp], %[value], %[storage]\n" // store the replacement, tmp = store failed |
740 | "teq %[tmp], #0\n" // check if store succeeded | |
741 | "bne 1b\n" | |
742 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
743 | : [tmp] "=&l" (tmp), [original] "=&r" (original), [storage] "+Q" (storage) | |
11fdf7f2 | 744 | : [value] "r" (v) |
b32b8144 FG |
745 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
746 | ); | |
747 | fence_after(order); | |
748 | return static_cast< storage_type >(original); | |
749 | } | |
750 | ||
751 | static BOOST_FORCEINLINE bool compare_exchange_weak( | |
752 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
753 | { | |
754 | fence_before(success_order); | |
755 | uint32_t success; | |
756 | uint32_t tmp; | |
757 | extended_storage_type original; | |
758 | __asm__ __volatile__ | |
759 | ( | |
760 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
761 | "mov %[success], #0\n" // success = 0 | |
11fdf7f2 | 762 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
763 | "cmp %[original], %[expected]\n" // flags = original==expected |
764 | "itt eq\n" // [hint that the following 2 instructions are conditional on flags.equal] | |
765 | "strexheq %[success], %[desired], %[storage]\n" // if (flags.equal) *(&storage) = desired, success = store failed | |
766 | "eoreq %[success], %[success], #1\n" // if (flags.equal) success ^= 1 (i.e. make it 1 if store succeeded) | |
767 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
768 | : [original] "=&r" (original), // %0 | |
769 | [success] "=&r" (success), // %1 | |
770 | [tmp] "=&l" (tmp), // %2 | |
771 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 TL |
772 | : [expected] "Ir" (atomics::detail::zero_extend< extended_storage_type >(expected)), // %4 |
773 | [desired] "r" (desired) // %5 | |
b32b8144 FG |
774 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
775 | ); | |
776 | if (success) | |
777 | fence_after(success_order); | |
778 | else | |
779 | fence_after(failure_order); | |
780 | expected = static_cast< storage_type >(original); | |
781 | return !!success; | |
782 | } | |
783 | ||
784 | static BOOST_FORCEINLINE bool compare_exchange_strong( | |
785 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
786 | { | |
787 | fence_before(success_order); | |
788 | uint32_t success; | |
789 | uint32_t tmp; | |
790 | extended_storage_type original; | |
791 | __asm__ __volatile__ | |
792 | ( | |
793 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
794 | "mov %[success], #0\n" // success = 0 | |
795 | "1:\n" | |
11fdf7f2 | 796 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
797 | "cmp %[original], %[expected]\n" // flags = original==expected |
798 | "bne 2f\n" // if (!flags.equal) goto end | |
799 | "strexh %[success], %[desired], %[storage]\n" // *(&storage) = desired, success = store failed | |
800 | "eors %[success], %[success], #1\n" // success ^= 1 (i.e. make it 1 if store succeeded); flags.equal = success == 0 | |
801 | "beq 1b\n" // if (flags.equal) goto retry | |
802 | "2:\n" | |
803 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
804 | : [original] "=&r" (original), // %0 | |
805 | [success] "=&r" (success), // %1 | |
806 | [tmp] "=&l" (tmp), // %2 | |
807 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 TL |
808 | : [expected] "Ir" (atomics::detail::zero_extend< extended_storage_type >(expected)), // %4 |
809 | [desired] "r" (desired) // %5 | |
b32b8144 FG |
810 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
811 | ); | |
812 | if (success) | |
813 | fence_after(success_order); | |
814 | else | |
815 | fence_after(failure_order); | |
816 | expected = static_cast< storage_type >(original); | |
817 | return !!success; | |
818 | } | |
819 | ||
820 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
821 | { | |
822 | fence_before(order); | |
823 | uint32_t tmp; | |
824 | extended_storage_type original, result; | |
825 | __asm__ __volatile__ | |
826 | ( | |
827 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
828 | "1:\n" | |
11fdf7f2 | 829 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
830 | "add %[result], %[original], %[value]\n" // result = original + value |
831 | "strexh %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
832 | "teq %[tmp], #0\n" // flags = tmp==0 | |
833 | "bne 1b\n" // if (!flags.equal) goto retry | |
834 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
835 | : [original] "=&r" (original), // %0 | |
836 | [result] "=&r" (result), // %1 | |
837 | [tmp] "=&l" (tmp), // %2 | |
838 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 839 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
840 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
841 | ); | |
842 | fence_after(order); | |
843 | return static_cast< storage_type >(original); | |
844 | } | |
845 | ||
846 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
847 | { | |
848 | fence_before(order); | |
849 | uint32_t tmp; | |
850 | extended_storage_type original, result; | |
851 | __asm__ __volatile__ | |
852 | ( | |
853 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
854 | "1:\n" | |
11fdf7f2 | 855 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
856 | "sub %[result], %[original], %[value]\n" // result = original - value |
857 | "strexh %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
858 | "teq %[tmp], #0\n" // flags = tmp==0 | |
859 | "bne 1b\n" // if (!flags.equal) goto retry | |
860 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
861 | : [original] "=&r" (original), // %0 | |
862 | [result] "=&r" (result), // %1 | |
863 | [tmp] "=&l" (tmp), // %2 | |
864 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 865 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
866 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
867 | ); | |
868 | fence_after(order); | |
869 | return static_cast< storage_type >(original); | |
870 | } | |
871 | ||
872 | static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
873 | { | |
874 | fence_before(order); | |
875 | uint32_t tmp; | |
876 | extended_storage_type original, result; | |
877 | __asm__ __volatile__ | |
878 | ( | |
879 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
880 | "1:\n" | |
11fdf7f2 | 881 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
882 | "and %[result], %[original], %[value]\n" // result = original & value |
883 | "strexh %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
884 | "teq %[tmp], #0\n" // flags = tmp==0 | |
885 | "bne 1b\n" // if (!flags.equal) goto retry | |
886 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
887 | : [original] "=&r" (original), // %0 | |
888 | [result] "=&r" (result), // %1 | |
889 | [tmp] "=&l" (tmp), // %2 | |
890 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 891 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
892 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
893 | ); | |
894 | fence_after(order); | |
895 | return static_cast< storage_type >(original); | |
896 | } | |
897 | ||
898 | static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
899 | { | |
900 | fence_before(order); | |
901 | uint32_t tmp; | |
902 | extended_storage_type original, result; | |
903 | __asm__ __volatile__ | |
904 | ( | |
905 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
906 | "1:\n" | |
11fdf7f2 | 907 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
908 | "orr %[result], %[original], %[value]\n" // result = original | value |
909 | "strexh %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
910 | "teq %[tmp], #0\n" // flags = tmp==0 | |
911 | "bne 1b\n" // if (!flags.equal) goto retry | |
912 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
913 | : [original] "=&r" (original), // %0 | |
914 | [result] "=&r" (result), // %1 | |
915 | [tmp] "=&l" (tmp), // %2 | |
916 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 917 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
918 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
919 | ); | |
920 | fence_after(order); | |
921 | return static_cast< storage_type >(original); | |
922 | } | |
923 | ||
924 | static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
925 | { | |
926 | fence_before(order); | |
927 | uint32_t tmp; | |
928 | extended_storage_type original, result; | |
929 | __asm__ __volatile__ | |
930 | ( | |
931 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
932 | "1:\n" | |
11fdf7f2 | 933 | "ldrexh %[original], %[storage]\n" // original = zero_extend(*(&storage)) |
b32b8144 FG |
934 | "eor %[result], %[original], %[value]\n" // result = original ^ value |
935 | "strexh %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
936 | "teq %[tmp], #0\n" // flags = tmp==0 | |
937 | "bne 1b\n" // if (!flags.equal) goto retry | |
938 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
939 | : [original] "=&r" (original), // %0 | |
940 | [result] "=&r" (result), // %1 | |
941 | [tmp] "=&l" (tmp), // %2 | |
942 | [storage] "+Q" (storage) // %3 | |
11fdf7f2 | 943 | : [value] "Ir" (v) // %4 |
b32b8144 FG |
944 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
945 | ); | |
946 | fence_after(order); | |
947 | return static_cast< storage_type >(original); | |
948 | } | |
949 | ||
950 | static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
951 | { | |
952 | return !!exchange(storage, (storage_type)1, order); | |
953 | } | |
954 | ||
955 | static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
956 | { | |
957 | store(storage, 0, order); | |
958 | } | |
959 | }; | |
960 | ||
961 | #else // defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXH_STREXH) | |
7c673cae FG |
962 | |
963 | template< > | |
964 | struct operations< 2u, false > : | |
965 | public operations< 4u, false > | |
966 | { | |
967 | typedef operations< 4u, false > base_type; | |
968 | typedef base_type::storage_type storage_type; | |
969 | ||
970 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
971 | { | |
972 | fence_before(order); | |
973 | uint32_t tmp; | |
974 | storage_type original, result; | |
975 | __asm__ __volatile__ | |
976 | ( | |
977 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
978 | "1:\n" | |
979 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
980 | "add %[result], %[original], %[value]\n" // result = original + value | |
981 | "uxth %[result], %[result]\n" // zero extend result from 16 to 32 bits | |
982 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
983 | "teq %[tmp], #0\n" // flags = tmp==0 | |
984 | "bne 1b\n" // if (!flags.equal) goto retry | |
985 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
986 | : [original] "=&r" (original), // %0 | |
987 | [result] "=&r" (result), // %1 | |
988 | [tmp] "=&l" (tmp), // %2 | |
989 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 990 | : [value] "Ir" (v) // %4 |
7c673cae FG |
991 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
992 | ); | |
993 | fence_after(order); | |
994 | return original; | |
995 | } | |
996 | ||
997 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
998 | { | |
999 | fence_before(order); | |
1000 | uint32_t tmp; | |
1001 | storage_type original, result; | |
1002 | __asm__ __volatile__ | |
1003 | ( | |
1004 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
1005 | "1:\n" | |
1006 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
1007 | "sub %[result], %[original], %[value]\n" // result = original - value | |
1008 | "uxth %[result], %[result]\n" // zero extend result from 16 to 32 bits | |
1009 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
1010 | "teq %[tmp], #0\n" // flags = tmp==0 | |
1011 | "bne 1b\n" // if (!flags.equal) goto retry | |
1012 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
1013 | : [original] "=&r" (original), // %0 | |
1014 | [result] "=&r" (result), // %1 | |
1015 | [tmp] "=&l" (tmp), // %2 | |
1016 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 1017 | : [value] "Ir" (v) // %4 |
7c673cae FG |
1018 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
1019 | ); | |
1020 | fence_after(order); | |
1021 | return original; | |
1022 | } | |
1023 | }; | |
1024 | ||
1025 | template< > | |
1026 | struct operations< 2u, true > : | |
1027 | public operations< 4u, true > | |
1028 | { | |
1029 | typedef operations< 4u, true > base_type; | |
1030 | typedef base_type::storage_type storage_type; | |
1031 | ||
1032 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1033 | { | |
1034 | fence_before(order); | |
1035 | uint32_t tmp; | |
1036 | storage_type original, result; | |
1037 | __asm__ __volatile__ | |
1038 | ( | |
1039 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
1040 | "1:\n" | |
1041 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
1042 | "add %[result], %[original], %[value]\n" // result = original + value | |
1043 | "sxth %[result], %[result]\n" // sign extend result from 16 to 32 bits | |
1044 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
1045 | "teq %[tmp], #0\n" // flags = tmp==0 | |
1046 | "bne 1b\n" // if (!flags.equal) goto retry | |
1047 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
1048 | : [original] "=&r" (original), // %0 | |
1049 | [result] "=&r" (result), // %1 | |
1050 | [tmp] "=&l" (tmp), // %2 | |
1051 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 1052 | : [value] "Ir" (v) // %4 |
7c673cae FG |
1053 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
1054 | ); | |
1055 | fence_after(order); | |
1056 | return original; | |
1057 | } | |
1058 | ||
1059 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1060 | { | |
1061 | fence_before(order); | |
1062 | uint32_t tmp; | |
1063 | storage_type original, result; | |
1064 | __asm__ __volatile__ | |
1065 | ( | |
1066 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%[tmp]) | |
1067 | "1:\n" | |
1068 | "ldrex %[original], %[storage]\n" // original = *(&storage) | |
1069 | "sub %[result], %[original], %[value]\n" // result = original - value | |
1070 | "sxth %[result], %[result]\n" // sign extend result from 16 to 32 bits | |
1071 | "strex %[tmp], %[result], %[storage]\n" // *(&storage) = result, tmp = store failed | |
1072 | "teq %[tmp], #0\n" // flags = tmp==0 | |
1073 | "bne 1b\n" // if (!flags.equal) goto retry | |
1074 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%[tmp]) | |
1075 | : [original] "=&r" (original), // %0 | |
1076 | [result] "=&r" (result), // %1 | |
1077 | [tmp] "=&l" (tmp), // %2 | |
1078 | [storage] "+Q" (storage) // %3 | |
b32b8144 | 1079 | : [value] "Ir" (v) // %4 |
7c673cae FG |
1080 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC |
1081 | ); | |
1082 | fence_after(order); | |
1083 | return original; | |
1084 | } | |
1085 | }; | |
1086 | ||
b32b8144 | 1087 | #endif // defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXH_STREXH) |
7c673cae FG |
1088 | |
1089 | #if defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD) | |
1090 | ||
1091 | // Unlike 32-bit operations, for 64-bit loads and stores we must use ldrexd/strexd. | |
1092 | // Any other instructions result in a non-atomic sequence of 32-bit accesses. | |
1093 | // See "ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition", | |
1094 | // Section A3.5.3 "Atomicity in the ARM architecture". | |
1095 | ||
1096 | // In the asm blocks below we have to use 32-bit register pairs to compose 64-bit values. | |
1097 | // In order to pass the 64-bit operands to/from asm blocks, we use undocumented gcc feature: | |
1098 | // the lower half (Rt) of the operand is accessible normally, via the numbered placeholder (e.g. %0), | |
1099 | // and the upper half (Rt2) - via the same placeholder with an 'H' after the '%' sign (e.g. %H0). | |
1100 | // See: http://hardwarebug.org/2010/07/06/arm-inline-asm-secrets/ | |
1101 | ||
1102 | template< bool Signed > | |
1103 | struct operations< 8u, Signed > : | |
1104 | public gcc_arm_operations_base | |
1105 | { | |
11fdf7f2 TL |
1106 | typedef typename make_storage_type< 8u >::type storage_type; |
1107 | typedef typename make_storage_type< 8u >::aligned aligned_storage_type; | |
7c673cae | 1108 | |
b32b8144 FG |
1109 | static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 8u; |
1110 | static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed; | |
1111 | ||
7c673cae FG |
1112 | static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT |
1113 | { | |
1114 | exchange(storage, v, order); | |
1115 | } | |
1116 | ||
1117 | static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT | |
1118 | { | |
1119 | storage_type original; | |
1120 | uint32_t tmp; | |
1121 | __asm__ __volatile__ | |
1122 | ( | |
1123 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1124 | "ldrexd %1, %H1, [%2]\n" | |
1125 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1126 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1127 | "=&r" (original) // %1 | |
1128 | : "r" (&storage) // %2 | |
1129 | ); | |
1130 | fence_after(order); | |
1131 | return original; | |
1132 | } | |
1133 | ||
1134 | static BOOST_FORCEINLINE storage_type exchange(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1135 | { | |
1136 | storage_type original; | |
1137 | fence_before(order); | |
1138 | uint32_t tmp; | |
1139 | __asm__ __volatile__ | |
1140 | ( | |
1141 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1142 | "1:\n" | |
1143 | "ldrexd %1, %H1, [%3]\n" // load the original value | |
1144 | "strexd %0, %2, %H2, [%3]\n" // store the replacement, tmp = store failed | |
1145 | "teq %0, #0\n" // check if store succeeded | |
1146 | "bne 1b\n" | |
1147 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1148 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1149 | "=&r" (original) // %1 | |
1150 | : "r" (v), // %2 | |
1151 | "r" (&storage) // %3 | |
1152 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1153 | ); | |
1154 | fence_after(order); | |
1155 | return original; | |
1156 | } | |
1157 | ||
1158 | static BOOST_FORCEINLINE bool compare_exchange_weak( | |
1159 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
1160 | { | |
1161 | fence_before(success_order); | |
1162 | uint32_t tmp; | |
1163 | storage_type original, old_val = expected; | |
1164 | __asm__ __volatile__ | |
1165 | ( | |
1166 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1167 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1168 | "cmp %1, %2\n" // flags = original.lo==old_val.lo | |
1169 | "ittt eq\n" // [hint that the following 3 instructions are conditional on flags.equal] | |
1170 | "cmpeq %H1, %H2\n" // if (flags.equal) flags = original.hi==old_val.hi | |
1171 | "strexdeq %0, %4, %H4, [%3]\n" // if (flags.equal) *(&storage) = desired, tmp = store failed | |
1172 | "teqeq %0, #0\n" // if (flags.equal) flags = tmp==0 | |
1173 | "ite eq\n" // [hint that the following 2 instructions are conditional on flags.equal] | |
1174 | "moveq %2, #1\n" // if (flags.equal) old_val.lo = 1 | |
1175 | "movne %2, #0\n" // if (!flags.equal) old_val.lo = 0 | |
1176 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1177 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1178 | "=&r" (original), // %1 | |
1179 | "+r" (old_val) // %2 | |
1180 | : "r" (&storage), // %3 | |
1181 | "r" (desired) // %4 | |
1182 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1183 | ); | |
1184 | const uint32_t success = (uint32_t)old_val; | |
1185 | if (success) | |
1186 | fence_after(success_order); | |
1187 | else | |
1188 | fence_after(failure_order); | |
1189 | expected = original; | |
1190 | return !!success; | |
1191 | } | |
1192 | ||
1193 | static BOOST_FORCEINLINE bool compare_exchange_strong( | |
1194 | storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT | |
1195 | { | |
1196 | fence_before(success_order); | |
1197 | uint32_t tmp; | |
1198 | storage_type original, old_val = expected; | |
1199 | __asm__ __volatile__ | |
1200 | ( | |
1201 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1202 | "1:\n" | |
1203 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1204 | "cmp %1, %2\n" // flags = original.lo==old_val.lo | |
1205 | "it eq\n" // [hint that the following instruction is conditional on flags.equal] | |
1206 | "cmpeq %H1, %H2\n" // if (flags.equal) flags = original.hi==old_val.hi | |
1207 | "bne 2f\n" // if (!flags.equal) goto end | |
1208 | "strexd %0, %4, %H4, [%3]\n" // *(&storage) = desired, tmp = store failed | |
1209 | "teq %0, #0\n" // flags.equal = tmp == 0 | |
1210 | "bne 1b\n" // if (flags.equal) goto retry | |
1211 | "2:\n" | |
1212 | "ite eq\n" // [hint that the following 2 instructions are conditional on flags.equal] | |
1213 | "moveq %2, #1\n" // if (flags.equal) old_val.lo = 1 | |
1214 | "movne %2, #0\n" // if (!flags.equal) old_val.lo = 0 | |
1215 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1216 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1217 | "=&r" (original), // %1 | |
1218 | "+r" (old_val) // %2 | |
1219 | : "r" (&storage), // %3 | |
1220 | "r" (desired) // %4 | |
1221 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1222 | ); | |
1223 | const uint32_t success = (uint32_t)old_val; | |
1224 | if (success) | |
1225 | fence_after(success_order); | |
1226 | else | |
1227 | fence_after(failure_order); | |
1228 | expected = original; | |
1229 | return !!success; | |
1230 | } | |
1231 | ||
1232 | static BOOST_FORCEINLINE storage_type fetch_add(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1233 | { | |
1234 | fence_before(order); | |
1235 | storage_type original, result; | |
1236 | uint32_t tmp; | |
1237 | __asm__ __volatile__ | |
1238 | ( | |
1239 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1240 | "1:\n" | |
1241 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1242 | "adds %2, %1, %4\n" // result = original + value | |
1243 | "adc %H2, %H1, %H4\n" | |
1244 | "strexd %0, %2, %H2, [%3]\n" // *(&storage) = result, tmp = store failed | |
1245 | "teq %0, #0\n" // flags = tmp==0 | |
1246 | "bne 1b\n" // if (!flags.equal) goto retry | |
1247 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1248 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1249 | "=&r" (original), // %1 | |
1250 | "=&r" (result) // %2 | |
1251 | : "r" (&storage), // %3 | |
1252 | "r" (v) // %4 | |
1253 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1254 | ); | |
1255 | fence_after(order); | |
1256 | return original; | |
1257 | } | |
1258 | ||
1259 | static BOOST_FORCEINLINE storage_type fetch_sub(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1260 | { | |
1261 | fence_before(order); | |
1262 | storage_type original, result; | |
1263 | uint32_t tmp; | |
1264 | __asm__ __volatile__ | |
1265 | ( | |
1266 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1267 | "1:\n" | |
1268 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1269 | "subs %2, %1, %4\n" // result = original - value | |
1270 | "sbc %H2, %H1, %H4\n" | |
1271 | "strexd %0, %2, %H2, [%3]\n" // *(&storage) = result, tmp = store failed | |
1272 | "teq %0, #0\n" // flags = tmp==0 | |
1273 | "bne 1b\n" // if (!flags.equal) goto retry | |
1274 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1275 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1276 | "=&r" (original), // %1 | |
1277 | "=&r" (result) // %2 | |
1278 | : "r" (&storage), // %3 | |
1279 | "r" (v) // %4 | |
1280 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1281 | ); | |
1282 | fence_after(order); | |
1283 | return original; | |
1284 | } | |
1285 | ||
1286 | static BOOST_FORCEINLINE storage_type fetch_and(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1287 | { | |
1288 | fence_before(order); | |
1289 | storage_type original, result; | |
1290 | uint32_t tmp; | |
1291 | __asm__ __volatile__ | |
1292 | ( | |
1293 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1294 | "1:\n" | |
1295 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1296 | "and %2, %1, %4\n" // result = original & value | |
1297 | "and %H2, %H1, %H4\n" | |
1298 | "strexd %0, %2, %H2, [%3]\n" // *(&storage) = result, tmp = store failed | |
1299 | "teq %0, #0\n" // flags = tmp==0 | |
1300 | "bne 1b\n" // if (!flags.equal) goto retry | |
1301 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1302 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1303 | "=&r" (original), // %1 | |
1304 | "=&r" (result) // %2 | |
1305 | : "r" (&storage), // %3 | |
1306 | "r" (v) // %4 | |
1307 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1308 | ); | |
1309 | fence_after(order); | |
1310 | return original; | |
1311 | } | |
1312 | ||
1313 | static BOOST_FORCEINLINE storage_type fetch_or(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1314 | { | |
1315 | fence_before(order); | |
1316 | storage_type original, result; | |
1317 | uint32_t tmp; | |
1318 | __asm__ __volatile__ | |
1319 | ( | |
1320 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1321 | "1:\n" | |
1322 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1323 | "orr %2, %1, %4\n" // result = original | value | |
1324 | "orr %H2, %H1, %H4\n" | |
1325 | "strexd %0, %2, %H2, [%3]\n" // *(&storage) = result, tmp = store failed | |
1326 | "teq %0, #0\n" // flags = tmp==0 | |
1327 | "bne 1b\n" // if (!flags.equal) goto retry | |
1328 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1329 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1330 | "=&r" (original), // %1 | |
1331 | "=&r" (result) // %2 | |
1332 | : "r" (&storage), // %3 | |
1333 | "r" (v) // %4 | |
1334 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1335 | ); | |
1336 | fence_after(order); | |
1337 | return original; | |
1338 | } | |
1339 | ||
1340 | static BOOST_FORCEINLINE storage_type fetch_xor(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT | |
1341 | { | |
1342 | fence_before(order); | |
1343 | storage_type original, result; | |
1344 | uint32_t tmp; | |
1345 | __asm__ __volatile__ | |
1346 | ( | |
1347 | BOOST_ATOMIC_DETAIL_ARM_ASM_START(%0) | |
1348 | "1:\n" | |
1349 | "ldrexd %1, %H1, [%3]\n" // original = *(&storage) | |
1350 | "eor %2, %1, %4\n" // result = original ^ value | |
1351 | "eor %H2, %H1, %H4\n" | |
1352 | "strexd %0, %2, %H2, [%3]\n" // *(&storage) = result, tmp = store failed | |
1353 | "teq %0, #0\n" // flags = tmp==0 | |
1354 | "bne 1b\n" // if (!flags.equal) goto retry | |
1355 | BOOST_ATOMIC_DETAIL_ARM_ASM_END(%0) | |
1356 | : BOOST_ATOMIC_DETAIL_ARM_ASM_TMPREG_CONSTRAINT(tmp), // %0 | |
1357 | "=&r" (original), // %1 | |
1358 | "=&r" (result) // %2 | |
1359 | : "r" (&storage), // %3 | |
1360 | "r" (v) // %4 | |
1361 | : BOOST_ATOMIC_DETAIL_ASM_CLOBBER_CC_COMMA "memory" | |
1362 | ); | |
1363 | fence_after(order); | |
1364 | return original; | |
1365 | } | |
1366 | ||
1367 | static BOOST_FORCEINLINE bool test_and_set(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
1368 | { | |
1369 | return !!exchange(storage, (storage_type)1, order); | |
1370 | } | |
1371 | ||
1372 | static BOOST_FORCEINLINE void clear(storage_type volatile& storage, memory_order order) BOOST_NOEXCEPT | |
1373 | { | |
1374 | store(storage, 0, order); | |
1375 | } | |
7c673cae FG |
1376 | }; |
1377 | ||
1378 | #endif // defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD) | |
1379 | ||
1380 | ||
1381 | BOOST_FORCEINLINE void thread_fence(memory_order order) BOOST_NOEXCEPT | |
1382 | { | |
1383 | if (order != memory_order_relaxed) | |
1384 | gcc_arm_operations_base::hardware_full_fence(); | |
1385 | } | |
1386 | ||
1387 | BOOST_FORCEINLINE void signal_fence(memory_order order) BOOST_NOEXCEPT | |
1388 | { | |
1389 | if (order != memory_order_relaxed) | |
1390 | __asm__ __volatile__ ("" ::: "memory"); | |
1391 | } | |
1392 | ||
1393 | } // namespace detail | |
1394 | } // namespace atomics | |
1395 | } // namespace boost | |
1396 | ||
1397 | #endif // BOOST_ATOMIC_DETAIL_OPS_GCC_ARM_HPP_INCLUDED_ |