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Re: [PATCH] S390: Fix backtrace in vdso functions.
On 28/11/2017 12:18, Florian Weimer wrote:
> On 11/28/2017 02:09 PM, Adhemerval Zanella wrote:
>> I am almost sure we can remove it for powerpc as well (I can't see
>> no immediate gain on doing a function call using inline assembly
>> as for INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK on powerpc).
>
> Is there another way to obtain the condition code for the error status?
>
> /* The vDSO does not return an error (it clear cr0.so on returning). */
> INTERNAL_SYSCALL_DECL (err);
> result =
> INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, uint64_t, 0);
>
> Thanks,
> Florian
I think we can simplify this call in specific since __kernel_get_tbfreq
always succeed if the vDSO is present. The only issue is the symbol
returns an uint64_t even for powerpc32.