Zephyr Project API 3.7.0
A Scalable Open Source RTOS
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error.h
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1/*
2 * Copyright (c) 2013-2014 Wind River Systems, Inc.
3 * Copyright (c) 2023 Arm Limited
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
16#ifndef ZEPHYR_INCLUDE_ARCH_ARM_ERROR_H_
17#define ZEPHYR_INCLUDE_ARCH_ARM_ERROR_H_
18
21#include <stdbool.h>
22
23#ifdef __cplusplus
24extern "C" {
25#endif
26
27#if defined(CONFIG_CPU_CORTEX_M)
28/* ARMv6 will hard-fault if SVC is called with interrupts locked. Just
29 * force them unlocked, the thread is in an undefined state anyway
30 *
31 * On ARMv7m we won't get a HardFault, but if interrupts were locked the
32 * thread will continue executing after the exception and forbid PendSV to
33 * schedule a new thread until they are unlocked which is not what we want.
34 * Force them unlocked as well.
35 */
36#define ARCH_EXCEPT(reason_p) \
37do {\
38 arch_irq_unlock(0); \
39 __asm__ volatile( \
40 "mov r0, %[_reason]\n" \
41 "svc %[id]\n" \
42 :: [_reason] "r" (reason_p), [id] "i" (_SVC_CALL_RUNTIME_EXCEPT) \
43 : "r0", "memory"); \
44} while (false)
45#elif defined(CONFIG_ARMV7_R) || defined(CONFIG_AARCH32_ARMV8_R) \
46 || defined(CONFIG_ARMV7_A)
47/*
48 * In order to support using svc for an exception while running in an
49 * isr, stack $lr_svc before calling svc. While exiting the isr,
50 * z_check_stack_sentinel is called. $lr_svc contains the return address.
51 * If the sentinel is wrong, it calls svc to cause an oops. This svc
52 * call will overwrite $lr_svc, losing the return address from the
53 * z_check_stack_sentinel call if it is not stacked before the svc.
54 */
55#define ARCH_EXCEPT(reason_p) \
56register uint32_t r0 __asm__("r0") = reason_p; \
57do { \
58 __asm__ volatile ( \
59 "push {lr}\n\t" \
60 "cpsie i\n\t" \
61 "svc %[id]\n\t" \
62 "pop {lr}\n\t" \
63 : \
64 : "r" (r0), [id] "i" (_SVC_CALL_RUNTIME_EXCEPT) \
65 : "memory"); \
66} while (false)
67#else
68#error Unknown ARM architecture
69#endif /* CONFIG_ARMV6_M_ARMV8_M_BASELINE */
70
71#ifdef __cplusplus
72}
73#endif
74
75#endif /* ZEPHYR_INCLUDE_ARCH_ARM_ERROR_H_ */
ARM AArch32 specific syscall header.
ARM AArch32 public exception handling.