Cortex-m3 异常切换进Trumble模式

最新推荐文章于 2025-02-01 18:10:30 发布

popebl

最新推荐文章于 2025-02-01 18:10:30 发布

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本文链接：https://blog.youkuaiyun.com/popebl/article/details/77513953

文章探讨了在STM32F107VC微控制器上使用Cortex-M3处理器进行堆栈恢复时遇到的问题，特别是在执行BX LR指令时出现的异常情况。通过对比执行前后寄存器的状态，分析可能的原因。

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MCU型号是STM32F107VC, Processor 是 Cortex-m3。

以下是从堆栈中恢复现场后的跳转。在执行BX LR的过程中遇到问题。

MSR IPSR,a1              
 80005e6:	f380 8805 	msr	IPSR, r0

LDMIA sp!,{r0-r12,lr}     //Recover all registers and resume
 80005ea:	e8bd 5fff 	ldmia.w	sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip, lr}
 
bx lr                         //at point of interrupt
 80005ee:	4770      	bx	lr

执行0x80005ee处代码，Jlink 仿真器的错误提示。

 Performing single step...
WARNING: T-bit of XPSR is 0 but should be 1. Changed to 1.
...Target halted (DBGRQ, PC = 0x08000D14)

执行前后的寄存器Dump结果

执行0x80005e6 前

0x00000000 in ?? ()
(gdb) source dump_reg.gdb
R0 = 01000020, R1 = 20002564, R2 = 01000000, R3 = 00000001
R4 = 20000060, R5 = 20000060, R6 = 20000714, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 20000064, R11= 20000CC0
R12= 20000CC4, R13= 20000C88, MSP= 20000C88, PSP= D478C6E4
R14(LR) = FFFFFFF9, R15(PC) = 080005E6
XPSR 6100000F, APSR 60000000, EPSR 01000000, IPSR 0000000F
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading from address 0xE000ED24 (Data = 0x00000800)
Reading from address 0xE000ED28 (Data = 0x00)
Reading from address 0xE000ED29 (Data = 0x00)
Reading from address 0xE000ED2A (Data = 0x0000)
Reading from address 0xE000ED2C (Data = 0x00000000)
Reading from address 0xE000ED30 (Data = 0x00000002)
Reading from address 0xE000ED34 (Data = 0xE000EDF8)
Reading from address 0xE000ED38 (Data = 0xE000EDF8)
Reading from address 0xE000ED3C (Data = 0x00000000)

执行0x80005EA前

R0 = 01000020, R1 = 20002564, R2 = 01000000, R3 = 00000001
R4 = 20000060, R5 = 20000060, R6 = 20000714, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 20000064, R11= 20000CC0
R12= 20000CC4, R13= 20000C88, MSP= 20000C88, PSP= D478C6E4
R14(LR) = FFFFFFF9, R15(PC) = 080005EA
XPSR 6100000F, APSR 60000000, EPSR 01000000, IPSR 0000000F
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading from address 0xE000ED24 (Data = 0x00000800)
Reading from address 0xE000ED28 (Data = 0x00)
Reading from address 0xE000ED29 (Data = 0x00)
Reading from address 0xE000ED2A (Data = 0x0000)
Reading from address 0xE000ED2C (Data = 0x00000000)
Reading from address 0xE000ED30 (Data = 0x00000001)
Reading from address 0xE000ED34 (Data = 0xE000EDF8)
Reading from address 0xE000ED38 (Data = 0xE000EDF8)
Reading from address 0xE000ED3C (Data = 0x00000000)

执行0x80005EE前

R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 200008C8, R11= 20000CC0
R12= 20000CC0, R13= 20000CC0, MSP= 20000CC0, PSP= D478C6E4
R14(LR) = 08000D14, R15(PC) = 080005EE
XPSR 6100000F, APSR 60000000, EPSR 01000000, IPSR 0000000F
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading from address 0xE000ED24 (Data = 0x00000800)
Reading from address 0xE000ED28 (Data = 0x00)
Reading from address 0xE000ED29 (Data = 0x00)
Reading from address 0xE000ED2A (Data = 0x0000)
Reading from address 0xE000ED2C (Data = 0x00000000)
Reading from address 0xE000ED30 (Data = 0x00000001)
Reading from address 0xE000ED34 (Data = 0xE000EDF8)
Reading from address 0xE000ED38 (Data = 0xE000EDF8)
Reading from address 0xE000ED3C (Data = 0x00000000)

执行0x80005EE后

R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 200008C8, R11= 20000CC0
R12= 20000CC0, R13= 20000CC0, MSP= 20000CC0, PSP= D478C6E4
R14(LR) = 08000D14, R15(PC) = 08000D14
XPSR 6100000F, APSR 60000000, EPSR 01000000, IPSR 0000000F
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading from address 0xE000ED24 (Data = 0x00000800)
Reading from address 0xE000ED28 (Data = 0x00)
Reading from address 0xE000ED29 (Data = 0x00)
Reading from address 0xE000ED2A (Data = 0x0000)
Reading from address 0xE000ED2C (Data = 0x00000000)
Reading from address 0xE000ED30 (Data = 0x00000001)
Reading from address 0xE000ED34 (Data = 0xE000EDF8)
Reading from address 0xE000ED38 (Data = 0xE000EDF8)
Reading from address 0xE000ED3C (Data = 0x00000000)