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Re: [Qemu-devel] [PATCH v2 4/8] linux-user: arm: handle CPSR.E correctly
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH v2 4/8] linux-user: arm: handle CPSR.E correctly in strex emulation |
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Date: |
Wed, 4 Jun 2014 09:30:23 +0100 |
On 4 June 2014 08:48, Paolo Bonzini <address@hidden> wrote:
> Il 03/06/2014 11:54, Peter Maydell ha scritto:
>>
>> In system emulation it's clear how we should implement
>>
>> things: TARGET_WORDS_BIGENDIAN is never set, data
>> accesses honour CPSR.E by doing MO_BE or MO_LE accesses,
>> instruction accesses are always MO_LE, and SCTLR.B
>> is implemented by XORing the address with 3 (for
>> byte accesses) or 1 (for halfword accesses).
> I think it's 2 for halfword accesses. :)
Doh :-)
> What about 64-bit accesses? Does the processor swap
> the two words of the result?
Yes. (There's a helpful table describing this in
section O.3.2 (in Appendix O) of the v7 ARM ARM.)
thanks
-- PMM