* Unprivileged access from GCC on ARM
@ 2020-08-14 8:28 Jiri Dobry
2020-08-17 19:28 ` Richard Earnshaw
0 siblings, 1 reply; 2+ messages in thread
From: Jiri Dobry @ 2020-08-14 8:28 UTC (permalink / raw)
To: gcc-help
Hello,
we need to load/store data from/to the pointer on system privilege
utilizing instruction with user privilege access. ARMs have such
instructions (LDRT/STRT). Is there some chance to force GCC compiler to use
LDRT/STRT instructions instead of usual LDR/STR?
I know that I can use an inline assembly, but I just need to know that I
don't miss some straight way.
Jiri
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Unprivileged access from GCC on ARM
2020-08-14 8:28 Unprivileged access from GCC on ARM Jiri Dobry
@ 2020-08-17 19:28 ` Richard Earnshaw
0 siblings, 0 replies; 2+ messages in thread
From: Richard Earnshaw @ 2020-08-17 19:28 UTC (permalink / raw)
To: Jiri Dobry, gcc-help
On 14/08/2020 09:28, Jiri Dobry via Gcc-help wrote:
> Hello,
>
> we need to load/store data from/to the pointer on system privilege
> utilizing instruction with user privilege access. ARMs have such
> instructions (LDRT/STRT). Is there some chance to force GCC compiler to use
> LDRT/STRT instructions instead of usual LDR/STR?
> I know that I can use an inline assembly, but I just need to know that I
> don't miss some straight way.
>
> Jiri
>
Sorry, there's no way to do this. You wouldn't want all access to use
LRDT anyway.
R.
^ permalink raw reply [flat|nested] 2+ messages in thread
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