On Fri, Feb 25, 2022 at 04:58:49PM +0000, Mark Brown wrote:
+4. System call behaviour +-------------------------
+* On syscall PSTATE.ZA is preserved, if PSTATE.ZA==1 then the contents of the
- ZA matrix are preserved.
+* On syscall PSTATE.SM will be cleared and the SVE registers will be handled
- as normal.
+* Neither the SVE registers nor ZA are used to pass arguments to or receive
- results from any syscall.
+* On creation fork() or clone() the newly created process will have PSTATE.SM
- and PSTATE.ZA cleared.
Nitpick: I'd drop fork() from here as we don't implement the syscall on arm64 and maybe just use clone() as an example, something like: "On process creation (e.g. clone()), the newly created ...".
Otherwise the ABI looks fine to me, though I'd like the Szabolcs and Luis to ack from the glibc/gdb side.
Reviewed-by: Catalin Marinas catalin.marinas@arm.com