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A Close Study of i5/OS Machine Interface (MI) Pointers

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  • Guest.Visitor
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    ** This thread discusses the article: A Close Study of i5/OS Machine Interface (MI) Pointers **
    Originally posted by defimov@yahoo.com View Post
    I there a way to reconstruct valid space pointer from materialized description?
    The materialized information of a space pointer (SPP) mainly consists of the following two parts:

    - symbolic ID of the target MI object

    - offset into space



    IMHO, under a couple of prerequisites, you can "reconstruct" a valid SPP by the following steps:

    - resolving the system pointer (SYP) to the target MI object via the "symbolic object-ID" by using the RSLVSP instruction

    - obtaining the SPP to the associated space of the target MI object using the SETSPPFP instruction upon the SYP

    - set the offset into the space object via the "offset into space"



    The prerequisites are:

    - The target MI object can be resolved by the symbolic object-ID. For example, a space object whose addressability is not inserted into a context can not be resolved by the RSLVSP instruction.

    - You can issue the SETSPPFP instruction on the resolved SYP successfully. For example, issuing SETSPPFP in a user state thread upon a system domain object will raise the Domain Violation (hex 4401) exception.
    Last edited by Guest.Visitor; 04-09-2011, 09:45 PM.

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    Guest started a topic A Close Study of i5/OS Machine Interface (MI) Pointers

    A Close Study of i5/OS Machine Interface (MI) Pointers

    ** This thread discusses the article: A Close Study of i5/OS Machine Interface (MI) Pointers **
    ** This thread discusses the Content article: A Close Study of i5/OS Machine Interface (MI) Pointers **
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