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[86.9.131.95]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436dcc8ddddsm74859185e9.0.2025.01.10.02.23.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2025 02:23:04 -0800 (PST) From: Stafford Horne To: LKML Cc: Linux OpenRISC , Stafford Horne , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: [PATCH 0/3] Add OpenRISC restartable sequences support Date: Fri, 10 Jan 2025 10:22:42 +0000 Message-ID: <20250110102248.3295944-1-shorne@gmail.com> X-Mailer: git-send-email 2.47.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds restartable sequences support to OpenRISC. This came after discussions with Michael on the libc-alpha list where he added some preliminary rseq support [1]. The changes use mostly the riscv port as a template. The patches were tested with selftests on qemu using my glibc branch containing rseq patches [2]. Note the RSEQ_SIG instruction I chose is a `l.nop 0x35` which is just a nop, which is different than most other architectures that use a `break` instruction. As the signature does not need to actually be a break or trap instruction I figured the nop is good for this. [1] https://gcc.gnu.org/pipermail/libc-alpha/2025-January/163504.html [2] https://github.com/stffrdhrn/or1k-glibc/commits/or1k-rseq/ Michael Jeanson (1): openrisc: Add HAVE_REGS_AND_STACK_ACCESS_API support Stafford Horne (2): openrisc: Add support for restartable sequences rseq/selftests: Add support for OpenRISC arch/openrisc/Kconfig | 2 + arch/openrisc/include/asm/ptrace.h | 73 +++- arch/openrisc/kernel/entry.S | 4 + arch/openrisc/kernel/ptrace.c | 96 ++++ arch/openrisc/kernel/signal.c | 2 + tools/testing/selftests/rseq/param_test.c | 24 + tools/testing/selftests/rseq/rseq-or1k-bits.h | 412 ++++++++++++++++++ .../selftests/rseq/rseq-or1k-thread-pointer.h | 13 + tools/testing/selftests/rseq/rseq-or1k.h | 181 ++++++++ .../selftests/rseq/rseq-thread-pointer.h | 2 + tools/testing/selftests/rseq/rseq.h | 2 + 11 files changed, 810 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/rseq/rseq-or1k-bits.h create mode 100644 tools/testing/selftests/rseq/rseq-or1k-thread-pointer.h create mode 100644 tools/testing/selftests/rseq/rseq-or1k.h -- 2.47.0