Messages in this thread | | | From | Björn Töpel <> | Subject | Re: [PATCH v2] riscv: Discard vector state on syscalls | Date | Mon, 26 Jun 2023 20:04:13 +0200 |
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Björn Töpel <bjorn@kernel.org> writes:
> Björn Töpel <bjorn@kernel.org> writes: > >> From: Björn Töpel <bjorn@rivosinc.com> >> >> The RISC-V vector specification states: >> Executing a system call causes all caller-saved vector registers >> (v0-v31, vl, vtype) and vstart to become unspecified. > > A bit of a corner case, but this will make sigreturn syscalls discard > the vector state as well. > > Is that an issue? E.g. a user cannot build userspace context switching > application. Does arm64 SVE handle sigreturn in a special way?
NVM; My bad. The vector state is cleared on *entry*, but then the registers passed on signal stack is restored as usual.
Sorry for the noise! We're all good! Björn
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