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Precise Memory Error

Susan Davies
Note: This was originally posted on 3rd August 2010 at http://forums.arm.com

I am working with a Cortex-m3 using assembler and am getting "precise memory errors".  The manuals refer to this fault a lot, but don't actually explain what it IS and how to fix it.  does anybody know?
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  • 0 Arm Employee Badge
    Note: This was originally posted on 4th August 2010 at http://forums.arm.com

    A precise memory error is one where the core knows which instruction caused the fault. This can correspond to a load or a store accessing memory which does not exist, or a prefetch error where the address where an instruction is supposed to be does not exist.

    Imprecise errors are caused by things such as cache line flushes hitting non-existent memory in cached cores. The data may have been in cache for some time, so the core does not know which instruction wrote the data which caused the error.

    How to fix it?

    Check your code is accessing the correct addresses - commonly caused by pointer corruption in code, or in the case of instruction fetch errors and incorrect linker setup.
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  • 0 Arm Employee Badge
    Note: This was originally posted on 4th August 2010 at http://forums.arm.com

    A precise memory error is one where the core knows which instruction caused the fault. This can correspond to a load or a store accessing memory which does not exist, or a prefetch error where the address where an instruction is supposed to be does not exist.

    Imprecise errors are caused by things such as cache line flushes hitting non-existent memory in cached cores. The data may have been in cache for some time, so the core does not know which instruction wrote the data which caused the error.

    How to fix it?

    Check your code is accessing the correct addresses - commonly caused by pointer corruption in code, or in the case of instruction fetch errors and incorrect linker setup.
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