| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 24 May 2024 11:56:00 -0700 From: Palmer Dabbelt <palmer@...osinc.com> To: linux-riscv@...ts.infradead.org Cc: corbet@....net, Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, aou@...s.berkeley.edu, costa.shul@...hat.com, Conor Dooley <conor.dooley@...rochip.com>, linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com> Subject: [PATCH] Documentation: RISC-V: uabi: Only scalar misaligned loads are supported From: Palmer Dabbelt <palmer@...osinc.com> We're stuck supporting scalar misaligned loads in userspace because they were part of the ISA at the time we froze the uABI. That wasn't the case for vector misaligned accesses, so depending on them unconditionally is a userspace bug. All extant vector hardware traps on these misaligned accesses. Signed-off-by: Palmer Dabbelt <palmer@...osinc.com> --- Documentation/arch/riscv/uabi.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/arch/riscv/uabi.rst b/Documentation/arch/riscv/uabi.rst index 54d199dce78b..2b420bab0527 100644 --- a/Documentation/arch/riscv/uabi.rst +++ b/Documentation/arch/riscv/uabi.rst @@ -65,4 +65,6 @@ the extension, or may have deliberately removed it from the listing. Misaligned accesses ------------------- -Misaligned accesses are supported in userspace, but they may perform poorly. +Misaligned scalar accesses are supported in userspace, but they may perform +poorly. Misaligned vector accesses are only supported if the Zicclsm extension +is supported. -- 2.45.0
Powered by blists - more mailing lists