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rtos/TARGET_CORTEX/TARGET_CORTEX_M/mbed_rtx_fault_handler.c
- Committer:
- kevman
- Date:
- 2019-03-13
- Revision:
- 2:7aab896b1a3b
- Parent:
- 0:38ceb79fef03
File content as of revision 2:7aab896b1a3b:
/* mbed Microcontroller Library * Copyright (c) 2006-2018 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "rtx_os.h" #include "device.h" #include "platform/mbed_error.h" #include "platform/mbed_interface.h" #include "hal/serial_api.h" #ifndef MBED_FAULT_HANDLER_DISABLED #include "mbed_rtx_fault_handler.h" //Functions Prototypes void print_context_info(void); //Global for populating the context in exception handler mbed_fault_context_t mbed_fault_context; //This is a handler function called from Fault handler to print the error information out. //This runs in fault context and uses special functions(defined in mbed_rtx_fault_handler.c) to print the information without using C-lib support. void mbed_fault_handler (uint32_t fault_type, void *mbed_fault_context_in, void *osRtxInfoIn) { mbed_error_status_t faultStatus = MBED_SUCCESS; mbed_error_printf("\n++ MbedOS Fault Handler ++\n\nFaultType: "); switch( fault_type ) { case MEMMANAGE_FAULT_EXCEPTION: mbed_error_printf("MemManageFault"); faultStatus = MBED_ERROR_MEMMANAGE_EXCEPTION; break; case BUS_FAULT_EXCEPTION: mbed_error_printf("BusFault"); faultStatus = MBED_ERROR_BUSFAULT_EXCEPTION; break; case USAGE_FAULT_EXCEPTION: mbed_error_printf("UsageFault"); faultStatus = MBED_ERROR_USAGEFAULT_EXCEPTION; break; //There is no way we can hit this code without getting an exception, so we have the default treated like hardfault case HARD_FAULT_EXCEPTION: default: mbed_error_printf("HardFault"); faultStatus = MBED_ERROR_HARDFAULT_EXCEPTION; break; } mbed_error_printf("\n\nContext:"); print_context_info(); mbed_error_printf("\n\n-- MbedOS Fault Handler --\n\n"); //Now call mbed_error, to log the error and halt the system mbed_error( faultStatus, "Fault exception", mbed_fault_context.PC_reg, NULL, 0 ); } MBED_NOINLINE void print_context_info(void) { //Context Regs for(int i=0;i<13;i++) { mbed_error_printf("\nR%-4d: %08X", i, ((uint32_t *)&mbed_fault_context)[i]); } mbed_error_printf("\nSP : %08X" "\nLR : %08X" "\nPC : %08X" "\nxPSR : %08X" "\nPSP : %08X" "\nMSP : %08X", mbed_fault_context.SP_reg, mbed_fault_context.LR_reg, mbed_fault_context.PC_reg, mbed_fault_context.xPSR, mbed_fault_context.PSP, mbed_fault_context.MSP ); //Capture CPUID to get core/cpu info mbed_error_printf("\nCPUID: %08X", SCB->CPUID); #if !defined(TARGET_M0) && !defined(TARGET_M0P) //Capture fault information registers to infer the cause of exception mbed_error_printf("\nHFSR : %08X" "\nMMFSR: %08X" "\nBFSR : %08X" "\nUFSR : %08X" "\nDFSR : %08X" "\nAFSR : %08X" ////Split/Capture CFSR into MMFSR, BFSR, UFSR ,SCB->HFSR, (0xFF & SCB->CFSR), ((0xFF00 & SCB->CFSR) >> 8), ((0xFFFF0000 & SCB->CFSR) >> 16), SCB->DFSR, SCB->AFSR ); //Print MMFAR only if its valid as indicated by MMFSR if ((0xFF & SCB->CFSR) & 0x80) { mbed_error_printf("\nMMFAR: %08X",SCB->MMFAR); } //Print BFAR only if its valid as indicated by BFSR if (((0xFF00 & SCB->CFSR) >> 8) & 0x80) { mbed_error_printf("\nBFAR : %08X",SCB->BFAR); } #endif //Print Mode if (mbed_fault_context.EXC_RETURN & 0x8) { mbed_error_printf("\nMode : Thread"); //Print Priv level in Thread mode - We capture CONTROL reg which reflects the privilege. //Note that the CONTROL register captured still reflects the privilege status of the //thread mode eventhough we are in Handler mode by the time we capture it. if(mbed_fault_context.CONTROL & 0x1) { mbed_error_printf("\nPriv : User"); } else { mbed_error_printf("\nPriv : Privileged"); } } else { mbed_error_printf("\nMode : Handler"); mbed_error_printf("\nPriv : Privileged"); } //Print Return Stack if (mbed_fault_context.EXC_RETURN & 0x4) { mbed_error_printf("\nStack: PSP"); } else { mbed_error_printf("\nStack: MSP"); } } #endif //MBED_FAULT_HANDLER_SUPPORT