Armv7 Exception Return Address

最新推荐文章于 2024-08-19 19:44:50 发布

snoopyljc

最新推荐文章于 2024-08-19 19:44:50 发布

阅读量337

点赞数

CC 4.0 BY-SA版权

分类专栏： Arm 文章标签： armv7

本文链接：https://blog.youkuaiyun.com/snoopyljc/article/details/89648138

Arm 专栏收录该内容

3 篇文章

订阅专栏

                    
ExceptionReturn InstructionInstruction returned toWhy(Find in TRM)
SVCMOVS PC, R14Next InstructionTakeSVCException:R14 = PC - 4the program counter is not updated when the exception is taken, so lr point the next instruction
UndefMOVS PC, R14Next InstructionTakeUndefInstrException:R14 = PC - 4same as SVC
Prefetch AbortSUBS PC, R14, #4Aborting instructionTakePrefetchAbortException: R14 = PC - 4save as SVC,the difference is returning to the aborting instruction, not the next instruction
Data abortSUBS PC, R14, #8Aborting instruction if preciseTakeDataAbortException : R14 = PCsave as Prefetch Abort , but lr = PC not PC - 4
FIQSUBS PC, R14, #4Next InstructionTakeIRQException : R14 = PC - 4IRQ or FIQ exceptions are generated only after the program counter has been updated,  so lr point two instructions beyond where the exception occurred, execution must continue from the instruction prior to the one pointed to by lr
IRQSUBS PC, R14, #4Next InstructionTakeFIQException : R14 = PC - 4same as FIQ

Exception	Return Instruction	Instruction returned to	Why(Find in TRM)
SVC	MOVS PC, R14	Next Instruction	TakeSVCException:R14 = PC - 4	the program counter is not updated when the exception is taken, so lr point the next instruction
Undef	MOVS PC, R14	Next Instruction	TakeUndefInstrException:R14 = PC - 4	same as SVC
Prefetch Abort	SUBS PC, R14, #4	Aborting instruction	TakePrefetchAbortException: R14 = PC - 4	save as SVC,the difference is returning to the aborting instruction, not the next instruction
Data abort	SUBS PC, R14, #8	Aborting instruction if precise	TakeDataAbortException : R14 = PC	save as Prefetch Abort , but lr = PC not PC - 4
FIQ	SUBS PC, R14, #4	Next Instruction	TakeIRQException : R14 = PC - 4	IRQ or FIQ exceptions are generated only after the program counter has been updated, so lr point two instructions beyond where the exception occurred, execution must continue from the instruction prior to the one pointed to by lr
IRQ	SUBS PC, R14, #4	Next Instruction	TakeFIQException : R14 = PC - 4	same as FIQ