* Daniel P. Berrangé:
> On Wed, Jun 12, 2024 at 09:59:25AM -0400, Stephen Gallagher wrote:
>> OK, that's a situation that will lead to annoying and unresolvable bug
>> reports. Would it be possible to put something in place that would
>> check processor capabilities early in execution before hitting any of
>> the affected instructions?
>
> Not trivial as a bunch of code executes from ELF constructors before
> main() starts.
Actually, you can put this into a C file that gets linked into the
executable:
asm ("\
.pushsection \".note.gnu.property\",\"a\",@note\n\
.p2align 3\n\
.long 4, 16, 5\n\
.asciz \"GNU\"\n\
.p2align 3\n\
.long 0xc0008002, 4, 3\n\
.p2align 3\n\
.popsection");
It marks the binary as requiring x86-64-v2. It will work only on
x86-64, so it has to be made conditional on architecture.
The glibc dynamic linker currently prints, “CPU ISA level is lower than
required“ if the CPU requirement cannot be satisfied. I think it's
still better than a crash, but maybe the wording could be improved (and
some diagnostic information included).
Thanks,
Florian
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