Re: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod:Unknown relocation: 36

[Sam Ravnborg]

> 
> I still wonder how a 32-bit system can generate an unaligned access trap for an
> access to a 64-bit variable aligned on 32-bit, given that there is, by
> definition, no 64-bit memory accesses available on the architecture ?

>From the SPARC V8 manual (this is the 32 bit version of SPARC):

    Load/Store Instructions

    ...
    Integer load and store instructions support byte (8-bit), halfword (16-bit), word
    (32-bit), and doubleword (64-bit) accesses.
    ...

    Alignment Restrictions

    Halfword accesses must be aligned on a 2-byte boundary, word accesses (which
    include instruction fetches) must be aligned on a 4-byte boundary, and doubleword
    accesses must be aligned on an 8-byte boundary. An improperly aligned
    address causes a load or store instruction to generate a mem_address_not_aligned
    trap.


	Sam
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