1 /**************************************************************************//**
2 * @file cmsis_armclang.h
3 * @brief CMSIS compiler specific macros, functions, instructions
6 ******************************************************************************/
8 * Copyright (c) 2009-2017 ARM Limited. All rights reserved.
10 * SPDX-License-Identifier: Apache-2.0
12 * Licensed under the Apache License, Version 2.0 (the License); you may
13 * not use this file except in compliance with the License.
14 * You may obtain a copy of the License at
16 * www.apache.org/licenses/LICENSE-2.0
18 * Unless required by applicable law or agreed to in writing, software
19 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
20 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21 * See the License for the specific language governing permissions and
22 * limitations under the License.
25 #ifndef __CMSIS_ARMCLANG_H
26 #define __CMSIS_ARMCLANG_H
28 #pragma clang system_header /* treat file as system include file */
30 #ifndef __ARM_COMPAT_H
31 #include <arm_compat.h> /* Compatibility header for ARM Compiler 5 intrinsics */
34 /* CMSIS compiler specific defines */
39 #define __INLINE __inline
42 #define __FORCEINLINE __attribute__((always_inline))
44 #ifndef __STATIC_INLINE
45 #define __STATIC_INLINE static __inline
47 #ifndef __STATIC_FORCEINLINE
48 #define __STATIC_FORCEINLINE __attribute__((always_inline)) static __inline
51 #define __NO_RETURN __declspec(noreturn)
54 #define __USED __attribute__((used))
57 #define __WEAK __attribute__((weak))
60 #define __PACKED __attribute__((packed, aligned(1)))
62 #ifndef __PACKED_STRUCT
63 #define __PACKED_STRUCT struct __attribute__((packed, aligned(1)))
65 #ifndef __UNALIGNED_UINT16_WRITE
66 #pragma clang diagnostic push
67 #pragma clang diagnostic ignored "-Wpacked"
68 /*lint -esym(9058, T_UINT16_WRITE)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT16_WRITE */
69 __PACKED_STRUCT T_UINT16_WRITE { uint16_t v; };
70 #pragma clang diagnostic pop
71 #define __UNALIGNED_UINT16_WRITE(addr, val) (void)((((struct T_UINT16_WRITE *)(void *)(addr))->v) = (val))
73 #ifndef __UNALIGNED_UINT16_READ
74 #pragma clang diagnostic push
75 #pragma clang diagnostic ignored "-Wpacked"
76 /*lint -esym(9058, T_UINT16_READ)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT16_READ */
77 __PACKED_STRUCT T_UINT16_READ { uint16_t v; };
78 #pragma clang diagnostic pop
79 #define __UNALIGNED_UINT16_READ(addr) (((const struct T_UINT16_READ *)(const void *)(addr))->v)
81 #ifndef __UNALIGNED_UINT32_WRITE
82 #pragma clang diagnostic push
83 #pragma clang diagnostic ignored "-Wpacked"
84 /*lint -esym(9058, T_UINT32_WRITE)*/ /* disable MISRA 2012 Rule 2.4 for T_UINT32_WRITE */
85 __PACKED_STRUCT T_UINT32_WRITE { uint32_t v; };
86 #pragma clang diagnostic pop
87 #define __UNALIGNED_UINT32_WRITE(addr, val) (void)((((struct T_UINT32_WRITE *)(void *)(addr))->v) = (val))
89 #ifndef __UNALIGNED_UINT32_READ
90 #pragma clang diagnostic push
91 #pragma clang diagnostic ignored "-Wpacked"
92 __PACKED_STRUCT T_UINT32_READ { uint32_t v; };
93 #pragma clang diagnostic pop
94 #define __UNALIGNED_UINT32_READ(addr) (((const struct T_UINT32_READ *)(const void *)(addr))->v)
97 #define __ALIGNED(x) __attribute__((aligned(x)))
100 #define __PACKED __attribute__((packed))
103 /* ########################## Core Instruction Access ######################### */
107 #define __NOP __builtin_arm_nop
110 \brief Wait For Interrupt
112 #define __WFI __builtin_arm_wfi
115 \brief Wait For Event
117 #define __WFE __builtin_arm_wfe
122 #define __SEV __builtin_arm_sev
125 \brief Instruction Synchronization Barrier
127 #define __ISB() do {\
128 __schedule_barrier();\
129 __builtin_arm_isb(0xF);\
130 __schedule_barrier();\
134 \brief Data Synchronization Barrier
136 #define __DSB() do {\
137 __schedule_barrier();\
138 __builtin_arm_dsb(0xF);\
139 __schedule_barrier();\
143 \brief Data Memory Barrier
145 #define __DMB() do {\
146 __schedule_barrier();\
147 __builtin_arm_dmb(0xF);\
148 __schedule_barrier();\
152 \brief Reverse byte order (32 bit)
153 \details Reverses the byte order in unsigned integer value. For example, 0x12345678 becomes 0x78563412.
154 \param [in] value Value to reverse
155 \return Reversed value
157 #define __REV(value) __builtin_bswap32(value)
160 \brief Reverse byte order (16 bit)
161 \details Reverses the byte order within each halfword of a word. For example, 0x12345678 becomes 0x34127856.
162 \param [in] value Value to reverse
163 \return Reversed value
165 #define __REV16(value) __ROR(__REV(value), 16)
169 \brief Reverse byte order (16 bit)
170 \details Reverses the byte order in a 16-bit value and returns the signed 16-bit result. For example, 0x0080 becomes 0x8000.
171 \param [in] value Value to reverse
172 \return Reversed value
174 #define __REVSH(value) (int16_t)__builtin_bswap16(value)
178 \brief Rotate Right in unsigned value (32 bit)
179 \details Rotate Right (immediate) provides the value of the contents of a register rotated by a variable number of bits.
180 \param [in] op1 Value to rotate
181 \param [in] op2 Number of Bits to rotate
182 \return Rotated value
184 __STATIC_FORCEINLINE uint32_t __ROR(uint32_t op1, uint32_t op2)
191 return (op1 >> op2) | (op1 << (32U - op2));
197 \param [in] value is ignored by the processor.
198 If required, a debugger can use it to store additional information about the breakpoint.
200 #define __BKPT(value) __ASM volatile ("bkpt "#value)
203 \brief Reverse bit order of value
204 \param [in] value Value to reverse
205 \return Reversed value
207 #define __RBIT __builtin_arm_rbit
210 \brief Count leading zeros
211 \param [in] value Value to count the leading zeros
212 \return number of leading zeros in value
214 #define __CLZ (uint8_t)__builtin_clz
217 \brief LDR Exclusive (8 bit)
218 \details Executes a exclusive LDR instruction for 8 bit value.
219 \param [in] ptr Pointer to data
220 \return value of type uint8_t at (*ptr)
222 #define __LDREXB (uint8_t)__builtin_arm_ldrex
226 \brief LDR Exclusive (16 bit)
227 \details Executes a exclusive LDR instruction for 16 bit values.
228 \param [in] ptr Pointer to data
229 \return value of type uint16_t at (*ptr)
231 #define __LDREXH (uint16_t)__builtin_arm_ldrex
234 \brief LDR Exclusive (32 bit)
235 \details Executes a exclusive LDR instruction for 32 bit values.
236 \param [in] ptr Pointer to data
237 \return value of type uint32_t at (*ptr)
239 #define __LDREXW (uint32_t)__builtin_arm_ldrex
242 \brief STR Exclusive (8 bit)
243 \details Executes a exclusive STR instruction for 8 bit values.
244 \param [in] value Value to store
245 \param [in] ptr Pointer to location
246 \return 0 Function succeeded
247 \return 1 Function failed
249 #define __STREXB (uint32_t)__builtin_arm_strex
252 \brief STR Exclusive (16 bit)
253 \details Executes a exclusive STR instruction for 16 bit values.
254 \param [in] value Value to store
255 \param [in] ptr Pointer to location
256 \return 0 Function succeeded
257 \return 1 Function failed
259 #define __STREXH (uint32_t)__builtin_arm_strex
262 \brief STR Exclusive (32 bit)
263 \details Executes a exclusive STR instruction for 32 bit values.
264 \param [in] value Value to store
265 \param [in] ptr Pointer to location
266 \return 0 Function succeeded
267 \return 1 Function failed
269 #define __STREXW (uint32_t)__builtin_arm_strex
272 \brief Remove the exclusive lock
273 \details Removes the exclusive lock which is created by LDREX.
275 #define __CLREX __builtin_arm_clrex
278 \brief Signed Saturate
279 \details Saturates a signed value.
280 \param [in] value Value to be saturated
281 \param [in] sat Bit position to saturate to (1..32)
282 \return Saturated value
284 #define __SSAT __builtin_arm_ssat
287 \brief Unsigned Saturate
288 \details Saturates an unsigned value.
289 \param [in] value Value to be saturated
290 \param [in] sat Bit position to saturate to (0..31)
291 \return Saturated value
293 #define __USAT __builtin_arm_usat
296 /* ########################### Core Function Access ########################### */
300 \details Returns the current value of the Floating Point Status/Control register.
301 \return Floating Point Status/Control register value
303 #define __get_FPSCR __builtin_arm_get_fpscr
307 \details Assigns the given value to the Floating Point Status/Control register.
308 \param [in] fpscr Floating Point Status/Control value to set
310 #define __set_FPSCR __builtin_arm_set_fpscr
312 /** \brief Get CPSR Register
313 \return CPSR Register value
315 __STATIC_FORCEINLINE uint32_t __get_CPSR(void)
318 __ASM volatile("MRS %0, cpsr" : "=r" (result) );
322 /** \brief Set CPSR Register
323 \param [in] cpsr CPSR value to set
325 __STATIC_FORCEINLINE void __set_CPSR(uint32_t cpsr)
327 __ASM volatile ("MSR cpsr, %0" : : "r" (cpsr) : "memory");
331 \return Processor Mode
333 __STATIC_FORCEINLINE uint32_t __get_mode(void)
335 return (__get_CPSR() & 0x1FU);
339 \param [in] mode Mode value to set
341 __STATIC_FORCEINLINE void __set_mode(uint32_t mode)
343 __ASM volatile("MSR cpsr_c, %0" : : "r" (mode) : "memory");
346 /** \brief Get Stack Pointer
347 \return Stack Pointer value
349 __STATIC_FORCEINLINE uint32_t __get_SP()
352 __ASM volatile("MOV %0, sp" : "=r" (result) : : "memory");
356 /** \brief Set Stack Pointer
357 \param [in] stack Stack Pointer value to set
359 __STATIC_FORCEINLINE void __set_SP(uint32_t stack)
361 __ASM volatile("MOV sp, %0" : : "r" (stack) : "memory");
364 /** \brief Get USR/SYS Stack Pointer
365 \return USR/SYS Stack Pointer value
367 __STATIC_FORCEINLINE uint32_t __get_SP_usr()
373 "CPS #0x1F \n" // no effect in USR mode
375 "MSR cpsr_c, %2 \n" // no effect in USR mode
376 "ISB" : "=r"(cpsr), "=r"(result) : "r"(cpsr) : "memory"
381 /** \brief Set USR/SYS Stack Pointer
382 \param [in] topOfProcStack USR/SYS Stack Pointer value to set
384 __STATIC_FORCEINLINE void __set_SP_usr(uint32_t topOfProcStack)
389 "CPS #0x1F \n" // no effect in USR mode
391 "MSR cpsr_c, %2 \n" // no effect in USR mode
392 "ISB" : "=r"(cpsr) : "r" (topOfProcStack), "r"(cpsr) : "memory"
397 \return Floating Point Exception Control register value
399 __STATIC_FORCEINLINE uint32_t __get_FPEXC(void)
401 #if (__FPU_PRESENT == 1)
403 __ASM volatile("VMRS %0, fpexc" : "=r" (result) : : "memory");
411 \param [in] fpexc Floating Point Exception Control value to set
413 __STATIC_FORCEINLINE void __set_FPEXC(uint32_t fpexc)
415 #if (__FPU_PRESENT == 1)
416 __ASM volatile ("VMSR fpexc, %0" : : "r" (fpexc) : "memory");
421 * Include common core functions to access Coprocessor 15 registers
424 #define __get_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MRC p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : "=r" (Rt) : : "memory" )
425 #define __set_CP(cp, op1, Rt, CRn, CRm, op2) __ASM volatile("MCR p" # cp ", " # op1 ", %0, c" # CRn ", c" # CRm ", " # op2 : : "r" (Rt) : "memory" )
426 #define __get_CP64(cp, op1, Rt, CRm) __ASM volatile("MRRC p" # cp ", " # op1 ", %Q0, %R0, c" # CRm : "=r" (Rt) : : "memory" )
427 #define __set_CP64(cp, op1, Rt, CRm) __ASM volatile("MCRR p" # cp ", " # op1 ", %Q0, %R0, c" # CRm : : "r" (Rt) : "memory" )
429 #include "cmsis_cp15.h"
432 /** \brief Clean and Invalidate the entire data or unified cache
434 Generic mechanism for cleaning/invalidating the entire data or unified cache to the point of coherency
436 __STATIC_INLINE void __L1C_CleanInvalidateCache(uint32_t op)
441 " MRC p15, 1, R6, c0, c0, 1 \n" // Read CLIDR
442 " ANDS R3, R6, #0x07000000 \n" // Extract coherency level
443 " MOV R3, R3, LSR #23 \n" // Total cache levels << 1
444 " BEQ Finished \n" // If 0, no need to clean
446 " MOV R10, #0 \n" // R10 holds current cache level << 1
447 "Loop1: ADD R2, R10, R10, LSR #1 \n" // R2 holds cache "Set" position
448 " MOV R1, R6, LSR R2 \n" // Bottom 3 bits are the Cache-type for this level
449 " AND R1, R1, #7 \n" // Isolate those lower 3 bits
451 " BLT Skip \n" // No cache or only instruction cache at this level
453 " MCR p15, 2, R10, c0, c0, 0 \n" // Write the Cache Size selection register
454 " ISB \n" // ISB to sync the change to the CacheSizeID reg
455 " MRC p15, 1, R1, c0, c0, 0 \n" // Reads current Cache Size ID register
456 " AND R2, R1, #7 \n" // Extract the line length field
457 " ADD R2, R2, #4 \n" // Add 4 for the line length offset (log2 16 bytes)
459 " ANDS R4, R4, R1, LSR #3 \n" // R4 is the max number on the way size (right aligned)
460 " CLZ R5, R4 \n" // R5 is the bit position of the way size increment
461 " LDR R7, =0x7FFF \n"
462 " ANDS R7, R7, R1, LSR #13 \n" // R7 is the max number of the index size (right aligned)
464 "Loop2: MOV R9, R4 \n" // R9 working copy of the max way size (right aligned)
466 "Loop3: ORR R11, R10, R9, LSL R5 \n" // Factor in the Way number and cache number into R11
467 " ORR R11, R11, R7, LSL R2 \n" // Factor in the Set number
470 " MCR p15, 0, R11, c7, c6, 2 \n" // DCISW. Invalidate by Set/Way
472 "Dccsw: CMP R0, #1 \n"
474 " MCR p15, 0, R11, c7, c10, 2 \n" // DCCSW. Clean by Set/Way
476 "Dccisw: MCR p15, 0, R11, c7, c14, 2 \n" // DCCISW. Clean and Invalidate by Set/Way
477 "cont: SUBS R9, R9, #1 \n" // Decrement the Way number
479 " SUBS R7, R7, #1 \n" // Decrement the Set number
481 "Skip: ADD R10, R10, #2 \n" // Increment the cache number
491 /** \brief Enable Floating Point Unit
493 Critical section, called from undef handler, so systick is disabled
495 __STATIC_INLINE void __FPU_Enable(void)
498 //Permit access to VFP/NEON, registers by modifying CPACR
499 " MRC p15,0,R1,c1,c0,2 \n"
500 " ORR R1,R1,#0x00F00000 \n"
501 " MCR p15,0,R1,c1,c0,2 \n"
503 //Ensure that subsequent instructions occur in the context of VFP/NEON access permitted
508 " ORR R1,R1,#0x40000000 \n"
511 //Initialise VFP/NEON registers to 0
514 #if TARGET_FEATURE_EXTENSION_REGISTER_COUNT >= 16
515 //Initialise D16 registers to 0
534 #if TARGET_FEATURE_EXTENSION_REGISTER_COUNT == 32
535 //Initialise D32 registers to 0
554 //Initialise FPSCR to a known state
556 " LDR R3,=0x00086060 \n" //Mask off all bits that do not have to be preserved. Non-preserved bits can/should be zero.
562 #endif /* __CMSIS_ARMCLANG_H */