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Re: [Qemu-devel] [PATCH v3 09/14] tcg-arm: Simplify logic in detecting t
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH v3 09/14] tcg-arm: Simplify logic in detecting the ARM ISA in use |
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Date: |
Thu, 4 Jul 2013 20:29:17 +0100 |
On 4 July 2013 18:44, Richard Henderson <address@hidden> wrote:
> On 07/04/2013 04:22 AM, Peter Maydell wrote:
>>
>> This change means we now set use_armv5_instructions
>> for __ARCH_ARCH_5__ and __ARM_ARCH_5E__, which we didn't
>> before. However one of the things that bool is gating is
>> whether we use the 'blx' insn, which is ARMv5T and above only.
>> So this will break v5-but-not-v5T CPUs.
>
> Hmm. And thus platform=v5 plus HWCAP_THUMB ought to detect
> that too, eh?
Should do, yes. (v5-but-not-v5T is pretty rare though; the
v7 ARM ARM describes it as an "obsolete variant", putting it
in the same class as ARMv1, v2 and v3. So if you wanted to
argue that we should just not support running on v5-not-T
you'd have a fairly reasonable case.)
-- PMM
[Qemu-devel] [PATCH v3 10/14] tcg-arm: Use AT_PLATFORM to detect the host ISA, Richard Henderson, 2013/07/03
[Qemu-devel] [PATCH v3 11/14] tcg: Fix high_pc fields in .debug_info, Richard Henderson, 2013/07/03
[Qemu-devel] [PATCH v3 12/14] tcg: Move the CIE and FDE header definitions to common code, Richard Henderson, 2013/07/03
[Qemu-devel] [PATCH v3 13/14] tcg-i386: Use QEMU_BUILD_BUG_ON instead of assert for frame size, Richard Henderson, 2013/07/03
[Qemu-devel] [PATCH v3 14/14] tcg-arm: Implement tcg_register_jit, Richard Henderson, 2013/07/03
Re: [Qemu-devel] [PATCH v3 00/14] tcg: remainder and tcg-arm updates, Claudio Fontana, 2013/07/04