Monday, February 8, 2010

How to Handle Unaligned Memory Accesses

The stock MIPS Linux kernel 2.6 code (32-bit MIPS) contains at least 4 files which uses unaligned memory access instructions (lwr, lwl, swr, swl), namely:


Lexra CPU core used in RTL8186 SoC doesn't support the unaligned memory access instructions. Therefore, to cope with it, kernel code containing those instructions must be replaced with byte-wise operations, i.e. replacing the unaligned memory access instructions with repeated single-byte operations.

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