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Re: [Qemu-devel] [PATCH for-2.12] target/arm: Don't corrupt insn_start a

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH for-2.12] target/arm: Don't corrupt insn_start arguments on 32-bit hosts
Date: Tue, 10 Apr 2018 08:20:21 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 04/10/2018 08:13 AM, Peter Maydell wrote:
> On 9 April 2018 at 23:09, Richard Henderson <address@hidden> wrote:
>> On 04/09/2018 08:38 PM, Peter Maydell wrote:
>>>      tcg_set_insn_param(s->insn_start, 2, syn);
>>> +#else
>>> +    /* tcg_gen_insn_start has split every target_ulong argument to
>>> +     * op_insn_start into two 32-bit arguments, so we want the low
>>> +     * half of the 3rd argument, which is at index 4.
>>> +     */
>>> +    tcg_set_insn_param(s->insn_start, 4, syn);
>>> +#endif
>> Ouch, good catch.
>> I think we should fix this in tcg_set_insn_param instead,
>> as several other targets are also affected by this.
> Are they? My grep didn't find anybody else using
> tcg_set_insn_param() except the gen-icount.h code,
> which isn't using target_long arguments.

Ah, the s390 code I thought I remembered is still sitting on a branch.  I shall
have to revive that for the next devel cycle...

> If we can fix it in the tcg generic code instead that
> would be nicer than an ifdef here, though.

I am working on this now.


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