Ppc603 Bus Error
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a bus error and it put the chip in a checkstopstate -- I could look at registers and memory with
Bus Error C++
an emulator, butcouldn't step through any instructions. The bus error was linux bus error message caused bytrying to access a memory location that did not exist (or wasn'tconfigured yet -- it was linux bus error core dumped very early in the project). The 8260 has acouple of registers, TESCR1 and TESCR2 ("60x Bus Transfer Error Statusand Control Register") that showed the errors. I would
How To Debug Bus Error
expect yourprocessor to have something similar.JohnDear All,I'm sorry that my question is about discontinued model, MPC(XPC)603.We have a own product using MPC603 & MPC105, almost similer to PRePmodel.This product sometimes hang up, and we thought that it might beour programs BUG.So we have tried to set JTAG debugger to catch what happend.Fortunately, we caught the
How To Solve Bus Error In Linux
state for 4 times, but we can'tunderstand what's up with the chip.1. debugger always stop at same address, and is at theext.Interrupt handler, fetch and execute "stwu" opcodefirst time in this interrupt.2. this states always appear at ext.Interrupt just after"divw" or "divwu" opcode execution.3. we didn't set any break points with debugger, but itstopped just like system hangs.4. All the memory can be accessed normaly via JTAG debuggerafter it stop, but step execution is not.I could't look for any information like that, so I have askedto motorola, but they didn't have valid information.For your reference, I'd like to attach 2 difference samples ofregisters states when JTAG debugger stopped and disasm sourceincludes executing points before intterupt occured, also sourcecode of Int.handler.Any suggetions appreciated. Thank you.* registers states when JTAG debugger stoppedgpr 0=003235ac 1=017ffe08 2=00000000 3=00000000 4=000009c45=009fbc18 6=009c70fc 7=200000008=003235ac 9=00000000 10=00000002 11=0000f030 12=000000a413=00000000 14=00000000 15=0000000016=00000000 17=00000000 18=00000000 19=005ad450 20=005ad45821=00002710 22=ffffffff 23=0000000124=00000004 25=00bf0c5c 26=00000004 27=00000014 28=00d2f50c29=00000000 30=00c1d5e0 31=00000294tgpr0=ffffffff 1=ffffffff 2=ffffffff 3=ffffffffdsisr=00000000 dar=00000000 msr=00001030 dec=4a2b483ertbu=0000013f rtbl=bbf30a7chid0=8000c000 lr=003235ac
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Bus Error 10 Mac
Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just bus error python like you, helping each other. Join them; it only takes a minute: Sign up What is a bus error? up vote 156 down vote favorite 49 What does the "bus error" message mean, and how does it http://comp.sys.powerpc.tech.narkive.com/wvRn0kgE/ppc603-hang-at-external-interrupt differ from a segfault? c unix segmentation-fault bus-error share|improve this question edited Oct 18 '15 at 10:44 Cool Guy 15.7k51952 asked Oct 17 '08 at 14:48 raldi 7,272216178 add a comment| 15 Answers 15 active oldest votes up vote 152 down vote accepted Bus errors are rare nowadays on x86 and occur when your processor cannot even attempt the memory access requested, typically: using a processor instruction with an address that does not satisfy http://stackoverflow.com/questions/212466/what-is-a-bus-error 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 5,75322336 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 6 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 malloc, and then write to enough of it and you'll get a bus error. –Eloff Jul 14 '15 at 0:09 add a comment| up vote 58 down vote A segfault is accessing memory that you're not allowed to access. It's read-only, yo
that ought to go on this page, please let me know. Online CPU Documentation IBM Manuals on the PowerPC 750 Microprocessor IBM DeveloperWorks http://aps.anl.gov/epics/base/ppc.php?format=printer introduction to PowerPC assembly language EPICS Target Architecture The version of gcc that ships with Tornado doesn't have explicit support for all of the different PowerPC CPU types, but you can easily find out what the correct settings to use are by looking at what is used to build your vxWorks image. For the Motorola MVME2700, which has a bus error ppc750 CPU, the correct target architecture is ppc604. If you find that you need to create new EPICS configuration files for a different CPU such as the ppc603 or ppc860, please send copies to Janet Anderson so they can be included in future EPICS releases. Relocation error If on trying to load the EPICS binaries you get the error message linux bus error Relocation value does not fit in 24 bits you are using the wrong target architecture for your vxWorks IOC. Here's why this happens and how we fixed it: The PowerPC relative branch instruction is limited to jumps between +/-32MB of the current instruction (24 bits = +/-4M instructions, 4bytes per instruction = +/-32MB). Unfortunately the vxWorks kernel gets put into the bottom end of RAM, but it loads all application code at the top end. If the two are separated by more than 32MB (should you have 64MB or more on board) then when it tries to load the application code those calls that use these relative branch instructions to vxWorks routines can't be resolved within 24 bits, and the loader prints the message you're seeing. How do you solve this? I used to suggest several possible solutions for this, but there's really only one that is of much use so I deleted the others to avoid confusion. In versions of Base from R3.14.2 onwards you should use the target architecture named ppcXXX_long for these IOCs, whic