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[86.9.131.95]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a8e4c1b44sm4177554f8f.90.2025.01.10.02.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2025 02:23:11 -0800 (PST) From: Stafford Horne To: LKML Cc: Linux OpenRISC , Stafford Horne , Michael Jeanson , Jonas Bonn , Stefan Kristiansson , Masahiro Yamada , Rong Xu Subject: [PATCH 2/3] openrisc: Add support for restartable sequences Date: Fri, 10 Jan 2025 10:22:44 +0000 Message-ID: <20250110102248.3295944-3-shorne@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250110102248.3295944-1-shorne@gmail.com> References: <20250110102248.3295944-1-shorne@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement support for restartable sequences on OpenRISC by doing: - Select HAVE_RSEQ in Kconfig - Call rseq_syscall() on return to userspace when CONFIG_DEBUG_RSEQ is enabled. - Call rseq_signal_deliver() to fixup the pre-signal stack frame when a signal is delivered on top of a restartable sequence critical section Cc: Michael Jeanson Signed-off-by: Stafford Horne --- arch/openrisc/Kconfig | 1 + arch/openrisc/kernel/entry.S | 4 ++++ arch/openrisc/kernel/signal.c | 2 ++ 3 files changed, 7 insertions(+) diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index f2be2a88c286..87996dde394c 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -27,6 +27,7 @@ config OPENRISC select HAVE_UID16 select HAVE_PAGE_SIZE_8KB select HAVE_REGS_AND_STACK_ACCESS_API + select HAVE_RSEQ select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_SMP_IDLE_THREAD diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index ce6f2b08a35e..c7e90b09645e 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -714,6 +714,10 @@ _syscall_check_trace_leave: * interrupts that set NEED_RESCHED or SIGNALPENDING... really true? */ _syscall_check_work: +#ifdef CONFIG_DEBUG_RSEQ + l.jal rseq_syscall + l.ori r3,r1,0 +#endif /* Here we need to disable interrupts */ DISABLE_INTERRUPTS(r27,r29) TRACE_IRQS_OFF diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c index c7ab42e2cb7a..f70a13ee0593 100644 --- a/arch/openrisc/kernel/signal.c +++ b/arch/openrisc/kernel/signal.c @@ -244,6 +244,8 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs) { int ret; + rseq_signal_deliver(ksig, regs); + ret = setup_rt_frame(ksig, sigmask_to_save(), regs); signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); -- 2.47.0