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Diffstat (limited to 'clang/lib/Headers/arm_cmse.h')
| -rw-r--r-- | clang/lib/Headers/arm_cmse.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/clang/lib/Headers/arm_cmse.h b/clang/lib/Headers/arm_cmse.h new file mode 100644 index 000000000000..ecf50ecc5c8e --- /dev/null +++ b/clang/lib/Headers/arm_cmse.h @@ -0,0 +1,217 @@ +//===---- arm_cmse.h - Arm CMSE support -----------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef __ARM_CMSE_H +#define __ARM_CMSE_H + +#if (__ARM_FEATURE_CMSE & 0x1) +#include <stddef.h> +#include <stdint.h> + +#define __ARM_CMSE_SECURE_MODE (__ARM_FEATURE_CMSE & 0x2) +#define CMSE_MPU_READWRITE 1 /* checks if readwrite_ok field is set */ +#define CMSE_AU_NONSECURE 2 /* checks if permissions have secure field unset */ +#define CMSE_MPU_UNPRIV 4 /* sets T flag on TT insrtuction */ +#define CMSE_MPU_READ 8 /* checks if read_ok field is set */ +#define CMSE_MPU_NONSECURE 16 /* sets A flag, checks if secure field unset */ +#define CMSE_NONSECURE (CMSE_AU_NONSECURE | CMSE_MPU_NONSECURE) + +#define cmse_check_pointed_object(p, f) \ + cmse_check_address_range((p), sizeof(*(p)), (f)) + +#if defined(__cplusplus) +extern "C" { +#endif + +typedef union { + struct cmse_address_info { +#ifdef __ARM_BIG_ENDIAN + /* __ARM_BIG_ENDIAN */ +#if (__ARM_CMSE_SECURE_MODE) + unsigned idau_region : 8; + unsigned idau_region_valid : 1; + unsigned secure : 1; + unsigned nonsecure_readwrite_ok : 1; + unsigned nonsecure_read_ok : 1; +#else + unsigned : 12; +#endif + unsigned readwrite_ok : 1; + unsigned read_ok : 1; +#if (__ARM_CMSE_SECURE_MODE) + unsigned sau_region_valid : 1; +#else + unsigned : 1; +#endif + unsigned mpu_region_valid : 1; +#if (__ARM_CMSE_SECURE_MODE) + unsigned sau_region : 8; +#else + unsigned : 8; +#endif + unsigned mpu_region : 8; + +#else /* __ARM_LITTLE_ENDIAN */ + unsigned mpu_region : 8; +#if (__ARM_CMSE_SECURE_MODE) + unsigned sau_region : 8; +#else + unsigned : 8; +#endif + unsigned mpu_region_valid : 1; +#if (__ARM_CMSE_SECURE_MODE) + unsigned sau_region_valid : 1; +#else + unsigned : 1; +#endif + unsigned read_ok : 1; + unsigned readwrite_ok : 1; +#if (__ARM_CMSE_SECURE_MODE) + unsigned nonsecure_read_ok : 1; + unsigned nonsecure_readwrite_ok : 1; + unsigned secure : 1; + unsigned idau_region_valid : 1; + unsigned idau_region : 8; +#else + unsigned : 12; +#endif +#endif /*__ARM_LITTLE_ENDIAN */ + } flags; + unsigned value; +} cmse_address_info_t; + +static cmse_address_info_t __attribute__((__always_inline__, __nodebug__)) +cmse_TT(void *__p) { + cmse_address_info_t __u; + __u.value = __builtin_arm_cmse_TT(__p); + return __u; +} +static cmse_address_info_t __attribute__((__always_inline__, __nodebug__)) +cmse_TTT(void *__p) { + cmse_address_info_t __u; + __u.value = __builtin_arm_cmse_TTT(__p); + return __u; +} + +#if __ARM_CMSE_SECURE_MODE +static cmse_address_info_t __attribute__((__always_inline__, __nodebug__)) +cmse_TTA(void *__p) { + cmse_address_info_t __u; + __u.value = __builtin_arm_cmse_TTA(__p); + return __u; +} +static cmse_address_info_t __attribute__((__always_inline__, __nodebug__)) +cmse_TTAT(void *__p) { + cmse_address_info_t __u; + __u.value = __builtin_arm_cmse_TTAT(__p); + return __u; +} +#endif + +#define cmse_TT_fptr(p) cmse_TT(__builtin_bit_cast(void *, (p))) +#define cmse_TTT_fptr(p) cmse_TTT(__builtin_bit_cast(void *, (p))) + +#if __ARM_CMSE_SECURE_MODE +#define cmse_TTA_fptr(p) cmse_TTA(__builtin_bit_cast(void *, (p))) +#define cmse_TTAT_fptr(p) cmse_TTAT(__builtin_bit_cast(void *, (p))) +#endif + +static void *__attribute__((__always_inline__)) +cmse_check_address_range(void *__pb, size_t __s, int __flags) { + uintptr_t __begin = (uintptr_t)__pb; + uintptr_t __end = __begin + __s - 1; + + if (__end < __begin) + return NULL; /* wrap around check */ + + /* Check whether the range crosses a 32-bytes aligned address */ + const int __single_check = (__begin ^ __end) < 0x20u; + + /* execute the right variant of the TT instructions */ + void *__pe = (void *)__end; + cmse_address_info_t __permb, __perme; + switch (__flags & (CMSE_MPU_UNPRIV | CMSE_MPU_NONSECURE)) { + case 0: + __permb = cmse_TT(__pb); + __perme = __single_check ? __permb : cmse_TT(__pe); + break; + case CMSE_MPU_UNPRIV: + __permb = cmse_TTT(__pb); + __perme = __single_check ? __permb : cmse_TTT(__pe); + break; +#if __ARM_CMSE_SECURE_MODE + case CMSE_MPU_NONSECURE: + __permb = cmse_TTA(__pb); + __perme = __single_check ? __permb : cmse_TTA(__pe); + break; + case CMSE_MPU_UNPRIV | CMSE_MPU_NONSECURE: + __permb = cmse_TTAT(__pb); + __perme = __single_check ? __permb : cmse_TTAT(__pe); + break; +#endif + /* if CMSE_NONSECURE is specified w/o __ARM_CMSE_SECURE_MODE */ + default: + return NULL; + } + + /* check that the range does not cross MPU, SAU, or IDAU region boundaries */ + if (__permb.value != __perme.value) + return NULL; +#if !(__ARM_CMSE_SECURE_MODE) + /* CMSE_AU_NONSECURE is only supported when __ARM_FEATURE_CMSE & 0x2 */ + if (__flags & CMSE_AU_NONSECURE) + return NULL; +#endif + + /* check the permission on the range */ + switch (__flags & ~(CMSE_MPU_UNPRIV | CMSE_MPU_NONSECURE)) { +#if (__ARM_CMSE_SECURE_MODE) + case CMSE_MPU_READ | CMSE_MPU_READWRITE | CMSE_AU_NONSECURE: + case CMSE_MPU_READWRITE | CMSE_AU_NONSECURE: + return __permb.flags.nonsecure_readwrite_ok ? __pb : NULL; + + case CMSE_MPU_READ | CMSE_AU_NONSECURE: + return __permb.flags.nonsecure_read_ok ? __pb : NULL; + + case CMSE_AU_NONSECURE: + return __permb.flags.secure ? NULL : __pb; +#endif + case CMSE_MPU_READ | CMSE_MPU_READWRITE: + case CMSE_MPU_READWRITE: + return __permb.flags.readwrite_ok ? __pb : NULL; + + case CMSE_MPU_READ: + return __permb.flags.read_ok ? __pb : NULL; + + default: + return NULL; + } +} + +#if __ARM_CMSE_SECURE_MODE +static int __attribute__((__always_inline__, __nodebug__)) +cmse_nonsecure_caller(void) { + return !((uintptr_t)__builtin_return_address(0) & 1); +} + +#define cmse_nsfptr_create(p) \ + __builtin_bit_cast(__typeof__(p), \ + (__builtin_bit_cast(uintptr_t, p) & ~(uintptr_t)1)) + +#define cmse_is_nsfptr(p) ((__builtin_bit_cast(uintptr_t, p) & 1) == 0) + +#endif /* __ARM_CMSE_SECURE_MODE */ + +void __attribute__((__noreturn__)) cmse_abort(void); +#if defined(__cplusplus) +} +#endif + +#endif /* (__ARM_FEATURE_CMSE & 0x1) */ + +#endif /* __ARM_CMSE_H */ |