Hi Ian,
On 15/03/2021 12:05, Ian Jackson wrote:
Julien Grall writes ("[PATCH for-4.15 v2] xen: Bump the minimum version of GCC
supported to 4.9 for arm32 and 5.1 on arm64"):
From: Julien Grall <[email protected]>
Compilers older than 4.8 have known codegen issues which can lead to
silent miscompilation:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145
Furthermore, pre-4.9 GCC have known bugs (including things like
internal compiler errors on Arm) which would require workaround (I
haven't checked if we have any in Xen).
The minimum version of GCC to build the hypervisor on arm is now
raised to 4.9.
In addition to that, on arm64, GCC version >= 4.9 and < 5.1 have been
shown to emit memory references beyond the stack pointer, resulting in
memory corruption if an interrupt is taken after the stack pointer has
been adjusted but before the reference has been executed.
Therefore, the minimum for arm64 is raised to 5.1.
Signed-off-by: Julien Grall <[email protected]>
Release-Acked-by: Ian Jackson <[email protected]>
Thanks! I have committed the patch with Bertrand and Stefano's reviewed-by.
Cheers,
--
Julien Grall
