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List:       kvm
Subject:    Re: [PATCH 3/3] arm: vectors support
From:       Peter Maydell <peter.maydell () linaro ! org>
Date:       2013-12-29 10:21:15
Message-ID: CAFEAcA8szNc-yPLMEKsgMRgF4pfNBFeeroZt4=TEDfJ_Dt+X+A () mail ! gmail ! com
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On 29 December 2013 06:32, Christoffer Dall <christoffer.dall@linaro.org> wrote:
> On Fri, Dec 13, 2013 at 11:58:06AM +0100, Andrew Jones wrote:

>> +     msr     cpsr_c, #(UND_MODE | PSR_I_BIT | PSR_F_BIT)
>> +     add     r4, #S_FRAME_SIZE
>> +     mov     sp, r4
>> +     msr     cpsr_c, #(ABT_MODE | PSR_I_BIT | PSR_F_BIT)
>> +     add     r4, #S_FRAME_SIZE
>> +     mov     sp, r4
>> +     msr     cpsr_c, #(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)
>> +     add     r4, #S_FRAME_SIZE
>> +     mov     sp, r4
>> +     msr     cpsr_c, #(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)
>> +     add     r4, #S_FRAME_SIZE
>> +     mov     sp, r4
>> +     msr     cpsr_cxsf, r3   @ back to svc mode
>> +     mov     pc, lr
>> +
>
> I would have loved to use the 'msr SP_<mode>, rX' and related
> instructions for this, but QEMU doesn't seem to support this yet, so it
> makes sense.

QEMU doesn't implement those because they are present
in ARMv7VE (ie v7 + virtualization extensions) only, and
we don't emulate the virt extensions.

thanks
-- PMM
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