1 /* 2 * Copyright (c) 2020 BayLibre, SAS 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 /** 8 * @file 9 * @brief RISCV public error handling 10 * 11 * RISCV-specific kernel error handling interface. Included by riscv/arch.h. 12 */ 13 14 #ifndef ZEPHYR_INCLUDE_ARCH_RISCV_ERROR_H_ 15 #define ZEPHYR_INCLUDE_ARCH_RISCV_ERROR_H_ 16 17 #include <arch/riscv/syscall.h> 18 #include <arch/riscv/exp.h> 19 #include <stdbool.h> 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 #ifdef CONFIG_USERSPACE 26 27 /* 28 * Kernel features like canary (software stack guard) are built 29 * with an argument to bypass the test before syscall (test if CPU 30 * is running in user or kernel) and directly execute the function. 31 * Then if this kind of code wishes to trigger a CPU exception, 32 * the implemented syscall is useless because the function is directly 33 * called even if the CPU is running in user (which happens during 34 * sanity check). To fix that, I bypass the generated test code by writing 35 * the test myself to remove the bypass ability. 36 */ 37 38 #define ARCH_EXCEPT(reason_p) do { \ 39 if (k_is_user_context()) { \ 40 arch_syscall_invoke1(reason_p, \ 41 K_SYSCALL_USER_FAULT); \ 42 } else { \ 43 compiler_barrier(); \ 44 z_impl_user_fault(reason_p); \ 45 } \ 46 CODE_UNREACHABLE; /* LCOV_EXCL_LINE */ \ 47 } while (false) 48 #else 49 #define ARCH_EXCEPT(reason_p) do { \ 50 z_impl_user_fault(reason_p); \ 51 } while (false) 52 #endif 53 54 __syscall void user_fault(unsigned int reason); 55 56 #include <syscalls/error.h> 57 58 #ifdef __cplusplus 59 } 60 #endif 61 62 #endif /* ZEPHYR_INCLUDE_ARCH_RISCV_ERROR_H_ */ 63
