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SEGGER 的硬件异常 分析
2022-07-29 07:12:00 【Car12】
SEGGER 异常分析源码文件如下
1.HardFaultHandler.S
内部使用了串口打印的功能所以在使用SEGGER时需要初始化串口1，也可以屏蔽该部分代码
;
;----------------------------------------------------------------------
;File : HardFaultHandler.S
;Purpose : HardFault exception handler for IAR, Keil and GNU assembler.
; Evaluates used stack (MSP, PSP) and passes appropiate stack
; pointer to the HardFaultHandler "C"-routine.
;------------- END-OF-HEADER ------------------------------------------
;
;/********************************************************************* ;* ;* Forward declarations of segments used ;* ;********************************************************************** ;*/
AREA OSKERNEL, CODE, READONLY, ALIGN=2
PRESERVE8
EXPORT HardFault_Handler
IMPORT HardFaultHandler
THUMB
;/********************************************************************* ;* ;* Global functions ;* ;********************************************************************** ;*/
;/********************************************************************* ;* ;* HardFault_Handler() ;* ;* Function description ;* Evaluates the used stack (MSP, PSP) and passes the appropiate ;* stack pointer to the HardFaultHandler "C"-routine. ;* ;* Notes ;* (1) Ensure that HardFault_Handler is part of the exception table ;*/
HardFault_Handler
;// This version is for Cortex M3, Cortex M4 and Cortex M4F
tst LR, #4 ;// Check EXC_RETURN in Link register bit 2.
ite EQ
mrseq R0, MSP ;// Stacking was using MSP.
mrsne R0, PSP ;// Stacking was using PSP.
b HardFaultHandler ;// Stack pointer passed through R0.
END
;/****** End Of File *************************************************/
2.SEGGER_HardFaultHandler.c
/********************************************************************* * SEGGER Microcontroller GmbH & Co. KG * * The Embedded Experts * ********************************************************************** * * * (c) 1995 - 2017 SEGGER Microcontroller GmbH & Co. KG * * * * Internet: segger.com Support: [email protected] * * * ********************************************************************** * * * embOS * Real time operating system for microcontrollers * * * * Please note: * * * * Knowledge of this file may under no circumstances * * be used to write a similar product or a real-time * * operating system for in-house use. * * * * Thank you for your fairness ! * * * ********************************************************************** * * * OS version: 4.32 * * * ********************************************************************** ---------------------------------------------------------------------- File : SEGGER_HardFaultHandler.c Purpose : Generic SEGGER HardFault handler for Cortex-M Literature: [1] Analyzing HardFaults on Cortex-M CPUs (https://www.segger.com/downloads/appnotes/AN00016_AnalyzingHardFaultsOnCortexM.pdf) Additional information: This HardFault handler enables user-friendly analysis of hard faults in debug configurations. If a release configuration requires a HardFault handler, a specific HardFault handler should be included instead, which for example issues a reset or lits an error LED. -------- END-OF-HEADER --------------------------------------------- */
#include "stdint.h"
#include "string.h"
#include "stm32f1xx_hal.h"
/********************************************************************* * * Defines * ********************************************************************** */
#define SYSHND_CTRL (*(volatile unsigned int*) (0xE000ED24u)) // System Handler Control and State Register
#define NVIC_MFSR (*(volatile unsigned char*) (0xE000ED28u)) // Memory Management Fault Status Register
#define NVIC_BFSR (*(volatile unsigned char*) (0xE000ED29u)) // Bus Fault Status Register
#define NVIC_UFSR (*(volatile unsigned short*)(0xE000ED2Au)) // Usage Fault Status Register
#define NVIC_HFSR (*(volatile unsigned int*) (0xE000ED2Cu)) // Hard Fault Status Register
#define NVIC_DFSR (*(volatile unsigned int*) (0xE000ED30u)) // Debug Fault Status Register
#define NVIC_BFAR (*(volatile unsigned int*) (0xE000ED38u)) // Bus Fault Manage Address Register
#define NVIC_AFSR (*(volatile unsigned int*) (0xE000ED3Cu)) // Auxiliary Fault Status Register
#ifndef DEBUG // Should be overwritten by project settings
#define DEBUG (1) // in debug builds
#endif
#define ERR_INFO "\r\nEnter HardFault_Handler, System Halt.\r\n"
/********************************************************************* * * Prototypes * ********************************************************************** */
#ifdef __cplusplus
extern "C" {
#endif
void HardFaultHandler(unsigned int* pStack);
#ifdef __cplusplus
}
#endif
/********************************************************************* * * Static data * ********************************************************************** */
#if DEBUG
static volatile unsigned int _Continue; // Set this variable to 1 to run further
static struct {
struct {
volatile unsigned int r0; // Register R0
volatile unsigned int r1; // Register R1
volatile unsigned int r2; // Register R2
volatile unsigned int r3; // Register R3
volatile unsigned int r12; // Register R12
volatile unsigned int lr; // Link register
volatile unsigned int pc; // Program counter
union {
volatile unsigned int byte;
struct {
unsigned int IPSR : 8; // Interrupt Program Status register (IPSR)
unsigned int EPSR : 19; // Execution Program Status register (EPSR)
unsigned int APSR : 5; // Application Program Status register (APSR)
} bits;
} psr; // Program status register.
} SavedRegs;
union {
volatile unsigned int byte;
struct {
unsigned int MEMFAULTACT : 1; // Read as 1 if memory management fault is active
unsigned int BUSFAULTACT : 1; // Read as 1 if bus fault exception is active
unsigned int UnusedBits1 : 1;
unsigned int USGFAULTACT : 1; // Read as 1 if usage fault exception is active
unsigned int UnusedBits2 : 3;
unsigned int SVCALLACT : 1; // Read as 1 if SVC exception is active
unsigned int MONITORACT : 1; // Read as 1 if debug monitor exception is active
unsigned int UnusedBits3 : 1;
unsigned int PENDSVACT : 1; // Read as 1 if PendSV exception is active
unsigned int SYSTICKACT : 1; // Read as 1 if SYSTICK exception is active
unsigned int USGFAULTPENDED : 1; // Usage fault pended; usage fault started but was replaced by a higher-priority exception
unsigned int MEMFAULTPENDED : 1; // Memory management fault pended; memory management fault started but was replaced by a higher-priority exception
unsigned int BUSFAULTPENDED : 1; // Bus fault pended; bus fault handler was started but was replaced by a higher-priority exception
unsigned int SVCALLPENDED : 1; // SVC pended; SVC was started but was replaced by a higher-priority exception
unsigned int MEMFAULTENA : 1; // Memory management fault handler enable
unsigned int BUSFAULTENA : 1; // Bus fault handler enable
unsigned int USGFAULTENA : 1; // Usage fault handler enable
} bits;
} syshndctrl; // System Handler Control and State Register (0xE000ED24)
union {
volatile unsigned char byte;
struct {
unsigned char IACCVIOL : 1; // Instruction access violation
unsigned char DACCVIOL : 1; // Data access violation
unsigned char UnusedBits : 1;
unsigned char MUNSTKERR : 1; // Unstacking error
unsigned char MSTKERR : 1; // Stacking error
unsigned char UnusedBits2 : 2;
unsigned char MMARVALID : 1; // Indicates the MMAR is valid
} bits;
} mfsr; // Memory Management Fault Status Register (0xE000ED28)
union {
volatile unsigned int byte;
struct {
unsigned int IBUSERR : 1; // Instruction access violation
unsigned int PRECISERR : 1; // Precise data access violation
unsigned int IMPREISERR : 1; // Imprecise data access violation
unsigned int UNSTKERR : 1; // Unstacking error
unsigned int STKERR : 1; // Stacking error
unsigned int UnusedBits : 2;
unsigned int BFARVALID : 1; // Indicates BFAR is valid
} bits;
} bfsr; // Bus Fault Status Register (0xE000ED29)
volatile unsigned int bfar; // Bus Fault Manage Address Register (0xE000ED38)
union {
volatile unsigned short byte;
struct {
unsigned short UNDEFINSTR : 1; // Attempts to execute an undefined instruction
unsigned short INVSTATE : 1; // Attempts to switch to an invalid state (e.g., ARM)
unsigned short INVPC : 1; // Attempts to do an exception with a bad value in the EXC_RETURN number
unsigned short NOCP : 1; // Attempts to execute a coprocessor instruction
unsigned short UnusedBits : 4;
unsigned short UNALIGNED : 1; // Indicates that an unaligned access fault has taken place
unsigned short DIVBYZERO : 1; // Indicates a divide by zero has taken place (can be set only if DIV_0_TRP is set)
} bits;
} ufsr; // Usage Fault Status Register (0xE000ED2A)
union {
volatile unsigned int byte;
struct {
unsigned int UnusedBits : 1;
unsigned int VECTBL : 1; // Indicates hard fault is caused by failed vector fetch
unsigned int UnusedBits2 : 28;
unsigned int FORCED : 1; // Indicates hard fault is taken because of bus fault/memory management fault/usage fault
unsigned int DEBUGEVT : 1; // Indicates hard fault is triggered by debug event
} bits;
} hfsr; // Hard Fault Status Register (0xE000ED2C)
union {
volatile unsigned int byte;
struct {
unsigned int HALTED : 1; // Halt requested in NVIC
unsigned int BKPT : 1; // BKPT instruction executed
unsigned int DWTTRAP : 1; // DWT match occurred
unsigned int VCATCH : 1; // Vector fetch occurred
unsigned int EXTERNAL : 1; // EDBGRQ signal asserted
} bits;
} dfsr; // Debug Fault Status Register (0xE000ED30)
volatile unsigned int afsr; // Auxiliary Fault Status Register (0xE000ED3C), Vendor controlled (optional)
} HardFaultRegs;
#endif
/********************************************************************* * * Global functions * ********************************************************************** */
/********************************************************************* * * HardFaultHandler() * * Function description * C part of the hard fault handler which is called by the assembler * function HardFault_Handler */
void HardFaultHandler(unsigned int* pStack) {
//
// In case we received a hard fault because of a breakpoint instruction, we return.
// This may happen when using semihosting for printf outputs and no debugger is connected,
// i.e. when running a "Debug" configuration in release mode.
//
if (NVIC_HFSR & (1u << 31)) {
NVIC_HFSR |= (1u << 31); // Reset Hard Fault status
*(pStack + 6u) += 2u; // PC is located on stack at SP + 24 bytes. Increment PC by 2 to skip break instruction.
return; // Return to interrupted application
}
#if DEBUG
//
// Read NVIC registers
//
HardFaultRegs.syshndctrl.byte = SYSHND_CTRL; // System Handler Control and State Register
HardFaultRegs.mfsr.byte = NVIC_MFSR; // Memory Fault Status Register
HardFaultRegs.bfsr.byte = NVIC_BFSR; // Bus Fault Status Register
HardFaultRegs.bfar = NVIC_BFAR; // Bus Fault Manage Address Register
HardFaultRegs.ufsr.byte = NVIC_UFSR; // Usage Fault Status Register
HardFaultRegs.hfsr.byte = NVIC_HFSR; // Hard Fault Status Register
HardFaultRegs.dfsr.byte = NVIC_DFSR; // Debug Fault Status Register
HardFaultRegs.afsr = NVIC_AFSR; // Auxiliary Fault Status Register
#if 1 //打开串口输出日志功能
{
const char *pError = ERR_INFO;
uint8_t i;
for (i = 0; i < strlen(ERR_INFO); i++)
{
USART1->DR = pError[i];
/* 等待发送结束 */
while((USART1->SR & USART_SR_TC) == 0);
}
}
#endif
//
// Halt execution
// If NVIC registers indicate readable memory, change the variable value to != 0 to continue execution.
//
_Continue = 0u;
while (_Continue == 0u) {
}
//
// Read saved registers from the stack.
//
HardFaultRegs.SavedRegs.r0 = pStack[0]; // Register R0
HardFaultRegs.SavedRegs.r1 = pStack[1]; // Register R1
HardFaultRegs.SavedRegs.r2 = pStack[2]; // Register R2
HardFaultRegs.SavedRegs.r3 = pStack[3]; // Register R3
HardFaultRegs.SavedRegs.r12 = pStack[4]; // Register R12
HardFaultRegs.SavedRegs.lr = pStack[5]; // Link register LR
HardFaultRegs.SavedRegs.pc = pStack[6]; // Program counter PC
HardFaultRegs.SavedRegs.psr.byte = pStack[7]; // Program status word PSR
//
// Halt execution
// To step out of the HardFaultHandler, change the variable value to != 0.
//
_Continue = 0u;
while (_Continue == 0u) {
}
#else
//
// If this module is included in a release configuration, simply stay in the HardFault handler
//
(void)pStack;
do {
} while (1);
#endif
}
/*************************** End of file ****************************/
3.使用方法
将这两个文件添加到工程中
屏蔽原来的 HardFault_Handler 函数
3. 启动调试
4. 全速运行程序，等待程序进入 HardFault_Handler 异常
5. 在 Watch1 窗口添加变量_Continue 
修改_Continue 为非0 值 单步运行 F11,就会在异常返回后进入程序出错的地方
这里发现指针异常
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