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Re: [Qemu-devel] [RFC 01/10] target-arm: protect cpu_exclusive_*.
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [RFC 01/10] target-arm: protect cpu_exclusive_*. |
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Date: |
Fri, 13 Mar 2015 12:38:03 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 03/03/2015 07:47 AM, Dr. David Alan Gilbert wrote:
> That works for ARM where you have to terminate a ldrex with a strex or clrex,
> but not all architectures have the equivalent of a clrex; most as I remember
> just let you do an ldrex equivalent, decide you don't want to do the strex
> equivalent
> and get on with life.
I'm pretty sure that's not the case. In fact, I can guarantee you that GCC
never issues clrex, but does in fact simply do nothing like you describe for
other architectures if we decide not to do the store.
r~