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Re: [2/2 ABI and toolchain part] Support Raspberry Pi [0-3] in big-endian mode



On 25/11/2020 13:53, Rin Okuyama wrote:
On 2020/11/24 23:59, Jason Thorpe wrote:

On Nov 24, 2020, at 4:28 AM, Rin Okuyama <rokuyama.rk%gmail.com@localhost> wrote:

CPU_CONTROL_SWP_ENABLE bit is missing for ARMv6. See cp15 c1 register
bit definition on p.3-46 of ARM1176JZF-S Technical Reference Manual:

| [10] F bit - Should Be Zero

Also, it does not work for MULTIPROCESSOR in principle:

Why?

Oops, it was wrong. ARM ARM "ARMv7-A and ARMv7-R edition", or, more
concisely, their web page says swp{,b} instructions on ARMv7 work for
MP system:

https://developer.arm.com/documentation/dht0008/a/swp-and-swpb/legacy-synchronization-instructions/limitations-of-swp-and-swpb

armv7 != armv8

or am I missing something here?

Nick


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