Bus Error Exception Instruction Fetch
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System Returned To Rom By Bus Error At Pc 0x0 Address 0x0
General PIC32 Topics » Exception Error - How to find the cause Mark Thread system returned to rom by address error at pc UnreadFlat Reading Mode❐ Helpful ReplyLockedException Error - How to find the cause Page: 12 > Showing page 1 of 2 Author Post bus error linux Essentials Only Full Version Dr. Whom Starting Member Total Posts : 32 Reward points : 0 Joined: 2012/12/28 13:33:02Location: 0 Status: offline 2013/01/29 09:04:03 (permalink) 0 Exception Error - How to find the cause Hello,
Last Reload Reason Address Error At Pc
I am new to the PIC32 and keep getting exception errors I am using the general exception handler The code returned is address = 0xA0000204, _excep_code = 0x00000018 "Enumeration ?" address = 0xA000020C, _excep_addr = 0x00100C03 Sometimes the _excep_addr is 0x00000000 or 0x0001BBE4 Any help would be appreciated #1 List Solutions Only 21 Replies Related Threads Dr. Whom Starting Member Total Posts :
Bus Error Cisco
32 Reward points : 0 Joined: 2012/12/28 13:33:02Location: 0 Status: offline Re:Exception Error - How to find the cause 2013/01/29 09:43:19 (permalink) 0 I modified the Exception Handler to : _excep_code=( _CP0_GET_CAUSE() & 0x0000007C ) >> 2; And now I get an exception code of IBE (Bus Error) Bus Error Exception Instruction Fetch _excep_Addr is 0x0001BBE4 I only seem to get this error with I2C turned on for now Are these BUS errors almost always a fault in the code (like addressing element of an array with -1 )? #2 DarioG italians must die! Total Posts : 51269 Reward points : 0 Joined: 2006/02/25 08:58:22Location: ich mochte Status: offline Re:Exception Error - How to find the cause 2013/01/29 10:46:50 (permalink) 0 Hmm, I'd say "yes". Bad pointers causing unwanted bus accesses Dario Greggio--Rule of thumb: Always read inputs from PORTx and write outputs to LATx. If you need to read what you set an output to, read LATx. #3 schneiderj Super Member Total Posts : 482 Reward points : 0 Joined: 2008/01/19 07:46:49Location: France, close to Paris Status: offline Re:Exception Error - How to find the cause 2013/01/29 11:11:07 (permalink) 0 Dr. Whom Are these BUS errors almost always a fault in the code (like addressing eleme
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How To Solve Bus Error In Linux
bus error w/AVR32Studio? Log in or register to post comments Go To Last Post 9 posts / 0 new Author Message -paul- Level: New how do you rectify the bus errors? Member Joined: Sat. Oct 18, 2008 Posts: 4 View posts #1 Posted by -paul-: Thu. Dec 11, 2008 - 02:24 AM Fivestar widget 12345Total votes: 0 Using AVR32Studio, AVR JTAG-ICE MK-II, freeRTOS, & lwIP on prototype H/W and modified an http://www.microchip.com/forums/m702610.aspx example freeRTOS project. I'm getting a data fetch bus error somewhere. It seems to go through the initialization, task creation, etc., OK, but when I let it run it ends up looping at the _handle_Bus_Error_Data_Fetch: exception vector. What's the best way to find the address where the exception occurred (so I can look it up in the .map file), and the address it was trying to fetch from? I assume the information is stored on the stack, or in a AVR32 http://www.avrfreaks.net/forum/how-debug-data-fetch-bus-error-wavr32studio register somewhere, but this is the first AVR32 project I've done, and have to learn the registers and exception model, etc., not to mention the AVR32Studio IDE. I'm sure many of you have been through this so any pointers to a FAQ, or other help would be much appreciated. Paul Tags:Tools, In-System Debuggers and Programmers Log in / register to post comments Top sma Level: Posting Freak Joined: Sun. Jan 14, 2007 Posts: 1836 View posts Location: Nantes, France #2 Posted by sma: Thu. Dec 11, 2008 - 02:21 PM 12345Total votes: 0 Looks like it's time to use the trace (if you have on AVRONe!) or the nanotrace (ok on the mkII). There's an appnote on atmel.com explaining how to proceed with AVR32Studio. -sma Log in or register to post comments Top sma Level: Posting Freak Joined: Sun. Jan 14, 2007 Posts: 1836 View posts Location: Nantes, France #3 Posted by sma: Thu. Dec 11, 2008 - 02:23 PM 12345Total votes: 0 You can also dump the registers and the RAM after the exception and see what is the failing address. Read the AVR32 tech ref manual, section "event" to see what happens and how registers are pushed for this exception. -sma Log in or register to post comments Top -paul- Level: New Member Joined: Sat. Oct 18, 2008 Posts: 4 View posts #4 Posted by -paul-: Mon. Dec 15, 2008 - 03:21 AM 12345Total votes: 0 I've dumped r
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn http://stackoverflow.com/questions/212466/what-is-a-bus-error more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow https://github.com/mbmccormick/xinu/blob/master/system/exception.c Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 155 down bus error vote favorite 49 What does the "bus error" message mean, and how does it differ from a segfault? c unix segmentation-fault bus-error share|improve this question edited Oct 18 '15 at 10:44 Cool Guy 15.8k51952 asked Oct 17 '08 at 14:48 raldi 7,239216178 add a comment| 15 Answers 15 active oldest votes up vote 150 down vote accepted Bus errors are rare nowadays on x86 and occur when your error at pc processor cannot even attempt the memory access requested, typically: using a processor instruction with an address that does not satisfy its alignment requirements. Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are typically the result of: using a pointer to something that was deallocated. using an uninitialized hence bogus pointer. using a null pointer. overflowing a buffer. PS: To be more precise this is not manipulating the pointer itself that will cause issues, it's accessing the memory it points to (dereferencing). share|improve this answer edited Oct 17 '08 at 15:18 answered Oct 17 '08 at 15:12 bltxd 5,70322336 52 They aren't rare; I'm just at Exercise 9 from How to Learn C the Hard Way and already encountered one... –11684 Mar 26 '13 at 20:12 5 Another cause of bus errors (on Linux anyway) is when the operating system can't back a virtual page with physical memory (e.g. low-memory conditions or out of huge pages when using huge page memory.) Typically mmap (and malloc) just reserve the virtual address space, and the kernel assigns the physical memory on demand (so called soft page faults.) Make a large enough m
Support Search GitHub This repository Watch 1 Star 1 Fork 0 mbmccormick/xinu Code Pull requests 0 Projects 0 Pulse Graphs Permalink Branch: master Switch branches/tags Branches Tags master Nothing to show Nothing to show Find file Copy path xinu/system/exception.c Fetching contributors… Cannot retrieve contributors at this time Raw Blame History 98 lines (89 sloc) 3.61 KB /* exception.c - exception */ #include