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[34.125.81.106]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23fbe30ae0bsm225725ad.18.2025.07.25.08.27.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jul 2025 08:27:50 -0700 (PDT) Date: Fri, 25 Jul 2025 15:27:45 +0000 From: Sami Tolvanen To: Deepak Gupta Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Masahiro Yamada , Nathan Chancellor , Nicolas Schier , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nick Desaulniers , Bill Wendling , Monk Chiang , Kito Cheng , Justin Stitt , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, rick.p.edgecombe@intel.com, broonie@kernel.org, cleger@rivosinc.com, apatel@ventanamicro.com, ajones@ventanamicro.com, conor.dooley@microchip.com, charlie@rivosinc.com, samuel.holland@sifive.com, bjorn@rivosinc.com, fweimer@redhat.com, jeffreyalaw@gmail.com, heinrich.schuchardt@canonical.com, andrew@sifive.com, ved@rivosinc.com Subject: Re: [PATCH 01/11] riscv: add landing pad for asm routines. Message-ID: <20250725152745.GA1724026@google.com> References: <20250724-riscv_kcfi-v1-0-04b8fa44c98c@rivosinc.com> <20250724-riscv_kcfi-v1-1-04b8fa44c98c@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250724-riscv_kcfi-v1-1-04b8fa44c98c@rivosinc.com> On Thu, Jul 24, 2025 at 04:36:54PM -0700, Deepak Gupta wrote: > SYM_* macros are used to define assembly routines. In this patch series, > re-define those macros in risc-v arch specific include file to include > a landing pad instruction at the beginning. This is done only when the > compiler flag for landing pad is enabled (i.e. __riscv_zicfilp). > > TODO: Update `lpad 0` with `lpad %lpad_hash(name)` after toolchain > support. I glanced through the proposed signature based landing pad labeling scheme, but didn't see any mentions of lpad_hash for labeling assembly functions. Is there more information somewhere about how this is going to be implemented? Sami