On older ARMs (ARM v5 and earlier), when a Data Abort happened as a result of the unaligned access being faulted, it was implementation defined as to what exactly would be in the "base register". This means, if the register supplying the address has writeback enabled, it was up to the specific implementation to determine whether the register
Compiler User Guide: __packed - Keil Non-Confidential PDF versionARM DUI0375H ARM® Compiler v5.06 for µVision® armcc User GuideVersion 5Home > Compiler-specific Features > __packed 9.12 __packed The __packed qualifier is useful to map a structure to an external data structure, or for accessing unaligned data, but it is generally not useful to save data size because of the relatively high cost of unaligned access. Computer Architecture: How does hardware support for A memory access is performed by a processor in terms of a load or a store instruction. On most architectures (x86/ARM/POWER), the load/store instructions support accessing different byte sizes (1 byte / 2 byte/4 byte /8 byte / 16 byte normally Cisco Bug: CSCut31679 - Kernel panic -Unhandled kernel
Unaligned memory access is the access of data with a size of N number of bytes from an address that is not evenly divisible by the number of bytes N.If the address is evenly divisible by N, we have aligned memory access.. We can express this as Address/N, where Address is the memory address and N is the number of bytes that are accessed. Here are some examples:
Synonyms for unaligned at Thesaurus.com with free online thesaurus, antonyms, and definitions. Find descriptive alternatives for unaligned. vectorization support: reference x has unaligned access Dec 13, 2013 US Patent for Fast unaligned memory access Patent (Patent
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Linux Kernel Documentation / unaligned-memory-access.txt The definition of an unaligned access ===== Unaligned memory accesses occur when you try to read N bytes of data starting from an address that is not evenly divisible by N (i.e. addr % N != 0). For example, reading 4 bytes of data from address 0x10004 is fine, but reading 4 bytes of data from address 0x10005 would be an unaligned memory access. unaligned transfers - Cortex-A / A-Profile forum Unaligned access to Cacheable write-back memory space - store/load miss access in L1 cache in any case issue read aligned access to the system. Means value of the address (AxADDR) is a multiple of the size of the data being transferred (AxSIZE). In your example, the 32-bit unaligned transaction will be fetched by the L1 cache as 32 bytes (cache