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http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka15414.html
How does the ARM Compiler support unaligned accesses? Applies to: DS-5, RealView Development Suite (RVDS) Answer. Older ARM processors require data load and stores to be to/from architecturally aligned addresses.
https://medium.com/@iLevex/the-curious-case-of-unaligned-access-on-arm-5dd0ebe24965
Dec 27, 2016 · The curious case of unaligned access on ARM. ... ARM didn’t support unaligned access in the expected way. For STR, STM and LDM, the requested address was simply rounded down to a …
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0344k/Beihgifg.html
Unaligned data access support The processor supports loads and stores of unaligned words and halfwords. The processor makes the required number of memory accesses and transfers adjacent bytes transparently. Data accesses that cross a word boundary can add to the access time. Setting the A bit in
https://jsolano.net/2012/09/06/arm-unaligned-data-access-and-floating-point-in-linux/
I was recently getting Data Aborts on an ARM11 program that makes intensive use on unaligned data accesses. The issue was caused by unaligned floating point accesses, which were not handled by the Linux kernel. Some background on the problem follows. ARM unaligned data access hardware support ARM 32-bit instructions must always be word boundary…
http://www.keil.com/support/man/docs/armclang_ref/armclang_ref_sam1444138667173.htm
The compiler defines the __ARM_FEATURE_UNALIGNED macro when -munaligned-access is enabled.. The libraries include special versions of certain library functions designed to exploit unaligned accesses. When unaligned access support is enabled, using -munaligned-access, the compilation tools use these library functions to take advantage of unaligned accesses.
https://developer.arm.com/docs/ddi0338/f/unaligned-and-mixed-endian-data-access-support/unaligned-access-support
6.2. Unaligned access support Instructions must always be aligned as follows: ARM 32-bit instructions must be word boundary aligned (Address [1:0] = b00) Thumb instructions must be halfword boundary aligned (Address [0] = 0). Unaligned data access support is described in: Word-invariant mode support
https://developer.arm.com/docs/ddi0301/h/unaligned-and-mixed-endian-data-access-support
About unaligned and mixed-endian support. Unaligned access support. Endian support. Operation of unaligned accesses. Mixed-endian access support. Instructions to reverse bytes in a general-purpose register. Instructions to change the CPSR E bit.
http://www.keil.com/forum/13940/cortex-support-of-unaligned-data-access/
Jan 09, 2009 · Thread 13940: HiThe Cortex-M3 should support unaligned data access to save RAMspace without the lost of performances. Is there a possibility toenable this features for an entire project or do I have to use the__packed attribut for each data structure?
https://stackoverflow.com/questions/9185811/indicating-unaligned-access-to-clang-for-arm-compatibility
Actually, unaligned pointers to packed structs are completely fine. But you need to make sure, that the -mcpu and -march parameters are set correctly during compile. Some ARM CPUs support unaligned ldrd, others don't.. Yes, unaligned access is non-standard and a compiler extension, but it's perfectly safe unless you pass a pointer to a member of a packed struct to another function by accident.
https://community.arm.com/developer/tools-software/tools/f/armds-forum/609/unaligned-access-problems
Jun 25, 2009 · With the RealView tools you can make a pointer point to a packed object - which will generate either unaligned accesses or byte accesses depending on the CPU you have chosen and the presence of the --[no-]unaligned flag: __packed int *pMyInt; There might be an equivalent for the IAR tools - but it varies from tool to tool ...
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