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([86.12.216.189]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49e61a803c5sm112535845e9.1.2026.09.12.15.20.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2026 15:20:14 -0700 (PDT) From: Luis Machado To: gdb-patches@sourceware.org Cc: thiago.bauermann@linaro.org Subject: [PATCH 0/2] gdb, aarch64: cache pointer authentication masks per inferior Date: Sat, 12 Sep 2026 23:20:09 +0100 Message-ID: <20260912222011.2395686-1-luis.machado.foss@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org aarch64_remove_non_address_bits recomputes the pointer authentication dmask/cmask on every call by walking the current inferior's thread list, looking up its regcache, and reading the masks from the target. This function is called from memory_xfer_partial for every memory transfer GDB performs, as well as from the watchpoint and breakpoint address-masking hooks, so the lookup happens far more often than the masks can possibly change (they are fixed for the life of a process and shared by all of its threads). Patch 1 caches the computed mask per inferior instead of recomputing it on every call, only populating the cache when a thread is stopped so a transient "thread running" state never gets cached as a permanent answer, and invalidates the cache on inferior exit, inferior appeared, and exec. Patch 2 adds a selftest that verifies the cache actually avoids redundant target register fetches across a simulated resume/stop cycle. Tested on aarch64-linux with no regressions, though the testing was done on a target without PAC support. It would be good to also validate on a PAC-enabled target to be sure. Luis Machado (2): gdb, aarch64: cache pointer authentication masks per inferior gdb, aarch64: add selftest for the pauth mask cache gdb/aarch64-tdep.c | 224 ++++++++++++++++++++++++++++++++++++--------- 1 file changed, 182 insertions(+), 42 deletions(-) -- 2.43.0