Elijah Stanger-Jones / mbed-dev-f303

test

platform/mbed_critical.c@1:8a094db1347f, 2020-11-09 (annotated)

Committer:
elijahsj
Date:
Mon Nov 09 00:02:47 2020 -0500
Revision:
1:8a094db1347f
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elijahsj 1:8a094db1347f 1 /*
elijahsj 1:8a094db1347f 2 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
elijahsj 1:8a094db1347f 3 * SPDX-License-Identifier: Apache-2.0
elijahsj 1:8a094db1347f 4 *
elijahsj 1:8a094db1347f 5 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elijahsj 1:8a094db1347f 6 * not use this file except in compliance with the License.
elijahsj 1:8a094db1347f 7 * You may obtain a copy of the License at
elijahsj 1:8a094db1347f 8 *
elijahsj 1:8a094db1347f 9 * http://www.apache.org/licenses/LICENSE-2.0
elijahsj 1:8a094db1347f 10 *
elijahsj 1:8a094db1347f 11 * Unless required by applicable law or agreed to in writing, software
elijahsj 1:8a094db1347f 12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elijahsj 1:8a094db1347f 13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elijahsj 1:8a094db1347f 14 * See the License for the specific language governing permissions and
elijahsj 1:8a094db1347f 15 * limitations under the License.
elijahsj 1:8a094db1347f 16 */
elijahsj 1:8a094db1347f 17
elijahsj 1:8a094db1347f 18 /* Declare __STDC_LIMIT_MACROS so stdint.h defines UINT32_MAX when using C++ */
elijahsj 1:8a094db1347f 19 #define __STDC_LIMIT_MACROS
elijahsj 1:8a094db1347f 20 #include "platform/mbed_critical.h"
elijahsj 1:8a094db1347f 21
elijahsj 1:8a094db1347f 22 #include "cmsis.h"
elijahsj 1:8a094db1347f 23 #include "platform/mbed_assert.h"
elijahsj 1:8a094db1347f 24 #include "platform/mbed_toolchain.h"
elijahsj 1:8a094db1347f 25
elijahsj 1:8a094db1347f 26 static volatile uint32_t interrupt_enable_counter = 0;
elijahsj 1:8a094db1347f 27 static volatile bool critical_interrupts_disabled = false;
elijahsj 1:8a094db1347f 28
elijahsj 1:8a094db1347f 29 bool core_util_are_interrupts_enabled(void)
elijahsj 1:8a094db1347f 30 {
elijahsj 1:8a094db1347f 31 #if defined(__CORTEX_A9)
elijahsj 1:8a094db1347f 32 return ((__get_CPSR() & 0x80) == 0);
elijahsj 1:8a094db1347f 33 #else
elijahsj 1:8a094db1347f 34 return ((__get_PRIMASK() & 0x1) == 0);
elijahsj 1:8a094db1347f 35 #endif
elijahsj 1:8a094db1347f 36 }
elijahsj 1:8a094db1347f 37
elijahsj 1:8a094db1347f 38 bool core_util_is_isr_active(void)
elijahsj 1:8a094db1347f 39 {
elijahsj 1:8a094db1347f 40 #if defined(__CORTEX_A9)
elijahsj 1:8a094db1347f 41 switch(__get_CPSR() & 0x1FU) {
elijahsj 1:8a094db1347f 42 case MODE_USR:
elijahsj 1:8a094db1347f 43 case MODE_SYS:
elijahsj 1:8a094db1347f 44 return false;
elijahsj 1:8a094db1347f 45 case MODE_SVC:
elijahsj 1:8a094db1347f 46 default:
elijahsj 1:8a094db1347f 47 return true;
elijahsj 1:8a094db1347f 48 }
elijahsj 1:8a094db1347f 49 #else
elijahsj 1:8a094db1347f 50 return (__get_IPSR() != 0U);
elijahsj 1:8a094db1347f 51 #endif
elijahsj 1:8a094db1347f 52 }
elijahsj 1:8a094db1347f 53
elijahsj 1:8a094db1347f 54 MBED_WEAK void core_util_critical_section_enter(void)
elijahsj 1:8a094db1347f 55 {
elijahsj 1:8a094db1347f 56 bool interrupts_disabled = !core_util_are_interrupts_enabled();
elijahsj 1:8a094db1347f 57 __disable_irq();
elijahsj 1:8a094db1347f 58
elijahsj 1:8a094db1347f 59 /* Save the interrupt disabled state as it was prior to any nested critical section lock use */
elijahsj 1:8a094db1347f 60 if (!interrupt_enable_counter) {
elijahsj 1:8a094db1347f 61 critical_interrupts_disabled = interrupts_disabled;
elijahsj 1:8a094db1347f 62 }
elijahsj 1:8a094db1347f 63
elijahsj 1:8a094db1347f 64 /* If the interrupt_enable_counter overflows or we are in a nested critical section and interrupts
elijahsj 1:8a094db1347f 65 are enabled, then something has gone badly wrong thus assert an error.
elijahsj 1:8a094db1347f 66 */
elijahsj 1:8a094db1347f 67 MBED_ASSERT(interrupt_enable_counter < UINT32_MAX);
elijahsj 1:8a094db1347f 68 // FIXME
elijahsj 1:8a094db1347f 69 #ifndef FEATURE_UVISOR
elijahsj 1:8a094db1347f 70 if (interrupt_enable_counter > 0) {
elijahsj 1:8a094db1347f 71 MBED_ASSERT(interrupts_disabled);
elijahsj 1:8a094db1347f 72 }
elijahsj 1:8a094db1347f 73 #else
elijahsj 1:8a094db1347f 74 #warning "core_util_critical_section_enter needs fixing to work from unprivileged code"
elijahsj 1:8a094db1347f 75 #endif /* FEATURE_UVISOR */
elijahsj 1:8a094db1347f 76 interrupt_enable_counter++;
elijahsj 1:8a094db1347f 77 }
elijahsj 1:8a094db1347f 78
elijahsj 1:8a094db1347f 79 MBED_WEAK void core_util_critical_section_exit(void)
elijahsj 1:8a094db1347f 80 {
elijahsj 1:8a094db1347f 81 /* If critical_section_enter has not previously been called, do nothing */
elijahsj 1:8a094db1347f 82 if (interrupt_enable_counter) {
elijahsj 1:8a094db1347f 83
elijahsj 1:8a094db1347f 84 // FIXME
elijahsj 1:8a094db1347f 85 #ifndef FEATURE_UVISOR
elijahsj 1:8a094db1347f 86 bool interrupts_disabled = !core_util_are_interrupts_enabled(); /* get the current interrupt disabled state */
elijahsj 1:8a094db1347f 87
elijahsj 1:8a094db1347f 88 MBED_ASSERT(interrupts_disabled); /* Interrupts must be disabled on invoking an exit from a critical section */
elijahsj 1:8a094db1347f 89 #else
elijahsj 1:8a094db1347f 90 #warning "core_util_critical_section_exit needs fixing to work from unprivileged code"
elijahsj 1:8a094db1347f 91 #endif /* FEATURE_UVISOR */
elijahsj 1:8a094db1347f 92
elijahsj 1:8a094db1347f 93 interrupt_enable_counter--;
elijahsj 1:8a094db1347f 94
elijahsj 1:8a094db1347f 95 /* Only re-enable interrupts if we are exiting the last of the nested critical sections and
elijahsj 1:8a094db1347f 96 interrupts were enabled on entry to the first critical section.
elijahsj 1:8a094db1347f 97 */
elijahsj 1:8a094db1347f 98 if (!interrupt_enable_counter && !critical_interrupts_disabled) {
elijahsj 1:8a094db1347f 99 __enable_irq();
elijahsj 1:8a094db1347f 100 }
elijahsj 1:8a094db1347f 101 }
elijahsj 1:8a094db1347f 102 }
elijahsj 1:8a094db1347f 103
elijahsj 1:8a094db1347f 104 #if __EXCLUSIVE_ACCESS
elijahsj 1:8a094db1347f 105
elijahsj 1:8a094db1347f 106 /* Supress __ldrex and __strex deprecated warnings - "#3731-D: intrinsic is deprecated" */
elijahsj 1:8a094db1347f 107 #if defined (__CC_ARM)
elijahsj 1:8a094db1347f 108 #pragma diag_suppress 3731
elijahsj 1:8a094db1347f 109 #endif
elijahsj 1:8a094db1347f 110
elijahsj 1:8a094db1347f 111 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
elijahsj 1:8a094db1347f 112 {
elijahsj 1:8a094db1347f 113 uint8_t currentValue = __LDREXB((volatile uint8_t*)ptr);
elijahsj 1:8a094db1347f 114 if (currentValue != *expectedCurrentValue) {
elijahsj 1:8a094db1347f 115 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 116 __CLREX();
elijahsj 1:8a094db1347f 117 return false;
elijahsj 1:8a094db1347f 118 }
elijahsj 1:8a094db1347f 119
elijahsj 1:8a094db1347f 120 return !__STREXB(desiredValue, (volatile uint8_t*)ptr);
elijahsj 1:8a094db1347f 121 }
elijahsj 1:8a094db1347f 122
elijahsj 1:8a094db1347f 123 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
elijahsj 1:8a094db1347f 124 {
elijahsj 1:8a094db1347f 125 uint16_t currentValue = __LDREXH((volatile uint16_t*)ptr);
elijahsj 1:8a094db1347f 126 if (currentValue != *expectedCurrentValue) {
elijahsj 1:8a094db1347f 127 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 128 __CLREX();
elijahsj 1:8a094db1347f 129 return false;
elijahsj 1:8a094db1347f 130 }
elijahsj 1:8a094db1347f 131
elijahsj 1:8a094db1347f 132 return !__STREXH(desiredValue, (volatile uint16_t*)ptr);
elijahsj 1:8a094db1347f 133 }
elijahsj 1:8a094db1347f 134
elijahsj 1:8a094db1347f 135
elijahsj 1:8a094db1347f 136 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
elijahsj 1:8a094db1347f 137 {
elijahsj 1:8a094db1347f 138 uint32_t currentValue = __LDREXW((volatile uint32_t*)ptr);
elijahsj 1:8a094db1347f 139 if (currentValue != *expectedCurrentValue) {
elijahsj 1:8a094db1347f 140 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 141 __CLREX();
elijahsj 1:8a094db1347f 142 return false;
elijahsj 1:8a094db1347f 143 }
elijahsj 1:8a094db1347f 144
elijahsj 1:8a094db1347f 145 return !__STREXW(desiredValue, (volatile uint32_t*)ptr);
elijahsj 1:8a094db1347f 146 }
elijahsj 1:8a094db1347f 147
elijahsj 1:8a094db1347f 148 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
elijahsj 1:8a094db1347f 149 {
elijahsj 1:8a094db1347f 150 uint8_t newValue;
elijahsj 1:8a094db1347f 151 do {
elijahsj 1:8a094db1347f 152 newValue = __LDREXB((volatile uint8_t*)valuePtr) + delta;
elijahsj 1:8a094db1347f 153 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
elijahsj 1:8a094db1347f 154 return newValue;
elijahsj 1:8a094db1347f 155 }
elijahsj 1:8a094db1347f 156
elijahsj 1:8a094db1347f 157 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
elijahsj 1:8a094db1347f 158 {
elijahsj 1:8a094db1347f 159 uint16_t newValue;
elijahsj 1:8a094db1347f 160 do {
elijahsj 1:8a094db1347f 161 newValue = __LDREXH((volatile uint16_t*)valuePtr) + delta;
elijahsj 1:8a094db1347f 162 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
elijahsj 1:8a094db1347f 163 return newValue;
elijahsj 1:8a094db1347f 164 }
elijahsj 1:8a094db1347f 165
elijahsj 1:8a094db1347f 166 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
elijahsj 1:8a094db1347f 167 {
elijahsj 1:8a094db1347f 168 uint32_t newValue;
elijahsj 1:8a094db1347f 169 do {
elijahsj 1:8a094db1347f 170 newValue = __LDREXW((volatile uint32_t*)valuePtr) + delta;
elijahsj 1:8a094db1347f 171 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
elijahsj 1:8a094db1347f 172 return newValue;
elijahsj 1:8a094db1347f 173 }
elijahsj 1:8a094db1347f 174
elijahsj 1:8a094db1347f 175
elijahsj 1:8a094db1347f 176 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
elijahsj 1:8a094db1347f 177 {
elijahsj 1:8a094db1347f 178 uint8_t newValue;
elijahsj 1:8a094db1347f 179 do {
elijahsj 1:8a094db1347f 180 newValue = __LDREXB((volatile uint8_t*)valuePtr) - delta;
elijahsj 1:8a094db1347f 181 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
elijahsj 1:8a094db1347f 182 return newValue;
elijahsj 1:8a094db1347f 183 }
elijahsj 1:8a094db1347f 184
elijahsj 1:8a094db1347f 185 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
elijahsj 1:8a094db1347f 186 {
elijahsj 1:8a094db1347f 187 uint16_t newValue;
elijahsj 1:8a094db1347f 188 do {
elijahsj 1:8a094db1347f 189 newValue = __LDREXH((volatile uint16_t*)valuePtr) - delta;
elijahsj 1:8a094db1347f 190 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
elijahsj 1:8a094db1347f 191 return newValue;
elijahsj 1:8a094db1347f 192 }
elijahsj 1:8a094db1347f 193
elijahsj 1:8a094db1347f 194 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
elijahsj 1:8a094db1347f 195 {
elijahsj 1:8a094db1347f 196 uint32_t newValue;
elijahsj 1:8a094db1347f 197 do {
elijahsj 1:8a094db1347f 198 newValue = __LDREXW((volatile uint32_t*)valuePtr) - delta;
elijahsj 1:8a094db1347f 199 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
elijahsj 1:8a094db1347f 200 return newValue;
elijahsj 1:8a094db1347f 201 }
elijahsj 1:8a094db1347f 202
elijahsj 1:8a094db1347f 203 #else
elijahsj 1:8a094db1347f 204
elijahsj 1:8a094db1347f 205 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
elijahsj 1:8a094db1347f 206 {
elijahsj 1:8a094db1347f 207 bool success;
elijahsj 1:8a094db1347f 208 uint8_t currentValue;
elijahsj 1:8a094db1347f 209 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 210 currentValue = *ptr;
elijahsj 1:8a094db1347f 211 if (currentValue == *expectedCurrentValue) {
elijahsj 1:8a094db1347f 212 *ptr = desiredValue;
elijahsj 1:8a094db1347f 213 success = true;
elijahsj 1:8a094db1347f 214 } else {
elijahsj 1:8a094db1347f 215 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 216 success = false;
elijahsj 1:8a094db1347f 217 }
elijahsj 1:8a094db1347f 218 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 219 return success;
elijahsj 1:8a094db1347f 220 }
elijahsj 1:8a094db1347f 221
elijahsj 1:8a094db1347f 222 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
elijahsj 1:8a094db1347f 223 {
elijahsj 1:8a094db1347f 224 bool success;
elijahsj 1:8a094db1347f 225 uint16_t currentValue;
elijahsj 1:8a094db1347f 226 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 227 currentValue = *ptr;
elijahsj 1:8a094db1347f 228 if (currentValue == *expectedCurrentValue) {
elijahsj 1:8a094db1347f 229 *ptr = desiredValue;
elijahsj 1:8a094db1347f 230 success = true;
elijahsj 1:8a094db1347f 231 } else {
elijahsj 1:8a094db1347f 232 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 233 success = false;
elijahsj 1:8a094db1347f 234 }
elijahsj 1:8a094db1347f 235 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 236 return success;
elijahsj 1:8a094db1347f 237 }
elijahsj 1:8a094db1347f 238
elijahsj 1:8a094db1347f 239
elijahsj 1:8a094db1347f 240 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
elijahsj 1:8a094db1347f 241 {
elijahsj 1:8a094db1347f 242 bool success;
elijahsj 1:8a094db1347f 243 uint32_t currentValue;
elijahsj 1:8a094db1347f 244 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 245 currentValue = *ptr;
elijahsj 1:8a094db1347f 246 if (currentValue == *expectedCurrentValue) {
elijahsj 1:8a094db1347f 247 *ptr = desiredValue;
elijahsj 1:8a094db1347f 248 success = true;
elijahsj 1:8a094db1347f 249 } else {
elijahsj 1:8a094db1347f 250 *expectedCurrentValue = currentValue;
elijahsj 1:8a094db1347f 251 success = false;
elijahsj 1:8a094db1347f 252 }
elijahsj 1:8a094db1347f 253 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 254 return success;
elijahsj 1:8a094db1347f 255 }
elijahsj 1:8a094db1347f 256
elijahsj 1:8a094db1347f 257
elijahsj 1:8a094db1347f 258 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
elijahsj 1:8a094db1347f 259 {
elijahsj 1:8a094db1347f 260 uint8_t newValue;
elijahsj 1:8a094db1347f 261 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 262 newValue = *valuePtr + delta;
elijahsj 1:8a094db1347f 263 *valuePtr = newValue;
elijahsj 1:8a094db1347f 264 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 265 return newValue;
elijahsj 1:8a094db1347f 266 }
elijahsj 1:8a094db1347f 267
elijahsj 1:8a094db1347f 268 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
elijahsj 1:8a094db1347f 269 {
elijahsj 1:8a094db1347f 270 uint16_t newValue;
elijahsj 1:8a094db1347f 271 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 272 newValue = *valuePtr + delta;
elijahsj 1:8a094db1347f 273 *valuePtr = newValue;
elijahsj 1:8a094db1347f 274 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 275 return newValue;
elijahsj 1:8a094db1347f 276 }
elijahsj 1:8a094db1347f 277
elijahsj 1:8a094db1347f 278 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
elijahsj 1:8a094db1347f 279 {
elijahsj 1:8a094db1347f 280 uint32_t newValue;
elijahsj 1:8a094db1347f 281 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 282 newValue = *valuePtr + delta;
elijahsj 1:8a094db1347f 283 *valuePtr = newValue;
elijahsj 1:8a094db1347f 284 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 285 return newValue;
elijahsj 1:8a094db1347f 286 }
elijahsj 1:8a094db1347f 287
elijahsj 1:8a094db1347f 288
elijahsj 1:8a094db1347f 289 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
elijahsj 1:8a094db1347f 290 {
elijahsj 1:8a094db1347f 291 uint8_t newValue;
elijahsj 1:8a094db1347f 292 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 293 newValue = *valuePtr - delta;
elijahsj 1:8a094db1347f 294 *valuePtr = newValue;
elijahsj 1:8a094db1347f 295 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 296 return newValue;
elijahsj 1:8a094db1347f 297 }
elijahsj 1:8a094db1347f 298
elijahsj 1:8a094db1347f 299 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
elijahsj 1:8a094db1347f 300 {
elijahsj 1:8a094db1347f 301 uint16_t newValue;
elijahsj 1:8a094db1347f 302 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 303 newValue = *valuePtr - delta;
elijahsj 1:8a094db1347f 304 *valuePtr = newValue;
elijahsj 1:8a094db1347f 305 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 306 return newValue;
elijahsj 1:8a094db1347f 307 }
elijahsj 1:8a094db1347f 308
elijahsj 1:8a094db1347f 309 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
elijahsj 1:8a094db1347f 310 {
elijahsj 1:8a094db1347f 311 uint32_t newValue;
elijahsj 1:8a094db1347f 312 core_util_critical_section_enter();
elijahsj 1:8a094db1347f 313 newValue = *valuePtr - delta;
elijahsj 1:8a094db1347f 314 *valuePtr = newValue;
elijahsj 1:8a094db1347f 315 core_util_critical_section_exit();
elijahsj 1:8a094db1347f 316 return newValue;
elijahsj 1:8a094db1347f 317 }
elijahsj 1:8a094db1347f 318
elijahsj 1:8a094db1347f 319 #endif
elijahsj 1:8a094db1347f 320
elijahsj 1:8a094db1347f 321
elijahsj 1:8a094db1347f 322 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue) {
elijahsj 1:8a094db1347f 323 return core_util_atomic_cas_u32(
elijahsj 1:8a094db1347f 324 (uint32_t *)ptr,
elijahsj 1:8a094db1347f 325 (uint32_t *)expectedCurrentValue,
elijahsj 1:8a094db1347f 326 (uint32_t)desiredValue);
elijahsj 1:8a094db1347f 327 }
elijahsj 1:8a094db1347f 328
elijahsj 1:8a094db1347f 329 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta) {
elijahsj 1:8a094db1347f 330 return (void *)core_util_atomic_incr_u32((uint32_t *)valuePtr, (uint32_t)delta);
elijahsj 1:8a094db1347f 331 }
elijahsj 1:8a094db1347f 332
elijahsj 1:8a094db1347f 333 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta) {
elijahsj 1:8a094db1347f 334 return (void *)core_util_atomic_decr_u32((uint32_t *)valuePtr, (uint32_t)delta);
elijahsj 1:8a094db1347f 335 }
elijahsj 1:8a094db1347f 336