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mbed_fault_handler.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2018 ARM Limited
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef MBED_FAULT_HANDLER_H
18 #define MBED_FAULT_HANDLER_H
19 
20 #ifdef __cplusplus
21 extern "C" {
22 #endif
23 
24 //Fault context struct
25 //WARNING: DO NOT CHANGE THIS STRUCT WITHOUT MAKING CORRESPONDING CHANGES in except.S files.
26 //Offset of these registers are used by fault handler in except.S
27 typedef struct {
28  uint32_t R0_reg;
29  uint32_t R1_reg;
30  uint32_t R2_reg;
31  uint32_t R3_reg;
32  uint32_t R4_reg;
33  uint32_t R5_reg;
34  uint32_t R6_reg;
35  uint32_t R7_reg;
36  uint32_t R8_reg;
37  uint32_t R9_reg;
38  uint32_t R10_reg;
39  uint32_t R11_reg;
40  uint32_t R12_reg;
41  uint32_t SP_reg;
42  uint32_t LR_reg;
43  uint32_t PC_reg;
44  uint32_t xPSR;
45  uint32_t PSP;
46  uint32_t MSP;
47  uint32_t EXC_RETURN;
48  uint32_t CONTROL;
49 } mbed_fault_context_t;
50 
51 //Fault type definitions
52 //WARNING: DO NOT CHANGE THESE VALUES WITHOUT MAKING CORRESPONDING CHANGES in except.S files.
53 #define HARD_FAULT_EXCEPTION (0x10) //Keep some gap between values for any future insertion/expansion
54 #define MEMMANAGE_FAULT_EXCEPTION (0x20)
55 #define BUS_FAULT_EXCEPTION (0x30)
56 #define USAGE_FAULT_EXCEPTION (0x40)
57 
58 //This is a handler function called from Fault handler to print the error information out.
59 //This runs in fault context and uses special functions(defined in mbed_fault_handler.c) to print the information without using C-lib support.
60 void mbed_fault_handler(uint32_t fault_type, const mbed_fault_context_t *mbed_fault_context_in);
61 
62 /**
63  * Call this function to retrieve the fault context after a fatal exception which triggered a system reboot. The function retrieves the fault context stored in crash-report ram area which is preserved over reboot.
64  * @param fault_context Pointer to mbed_fault_context_t struct allocated by the caller. This is the mbed_fault_context_t info captured as part of the fatal exception which triggered the reboot.
65  * @return 0 or MBED_SUCCESS on success.
66  * MBED_ERROR_INVALID_ARGUMENT in case of invalid error_info pointer
67  * MBED_ERROR_ITEM_NOT_FOUND if no reboot context is currently captured by teh system
68  *
69  */
70 mbed_error_status_t mbed_get_reboot_fault_context(mbed_fault_context_t *fault_context);
71 
72 #ifdef __cplusplus
73 }
74 #endif
75 
76 #endif
mbed_fault_context_t
Definition: mbed_fault_handler.h:27
mbed_error_status_t
int mbed_error_status_t
mbed_error_status_t description
Definition: mbed_error.h:110
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