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[54.240.197.231]) by smtp.gmail.com with ESMTPSA id j13-20020a05600c190d00b0040e88d1422esm4397968wmq.31.2024.02.01.04.52.48 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 01 Feb 2024 04:52:48 -0800 (PST) From: Puranjay Mohan To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Zi Shen Lim , Catalin Marinas , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kumar Kartikeya Dwivedi Cc: puranjay12@gmail.com Subject: [PATCH bpf-next v3 1/2] arm64: stacktrace: Implement arch_bpf_stack_walk() for the BPF JIT Date: Thu, 1 Feb 2024 12:52:24 +0000 Message-Id: <20240201125225.72796-2-puranjay12@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240201125225.72796-1-puranjay12@gmail.com> References: <20240201125225.72796-1-puranjay12@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789701138395817058 X-GMAIL-MSGID: 1789701138395817058 This will be used by bpf_throw() to unwind till the program marked as exception boundary and run the callback with the stack of the main program. This is required for supporting BPF exceptions on ARM64. Signed-off-by: Puranjay Mohan Acked-by: Catalin Marinas --- arch/arm64/kernel/stacktrace.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 7f88028a00c0..66cffc5fc0be 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -266,6 +267,31 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, kunwind_stack_walk(arch_kunwind_consume_entry, &data, task, regs); } +struct bpf_unwind_consume_entry_data { + bool (*consume_entry)(void *cookie, u64 ip, u64 sp, u64 fp); + void *cookie; +}; + +static bool +arch_bpf_unwind_consume_entry(const struct kunwind_state *state, void *cookie) +{ + struct bpf_unwind_consume_entry_data *data = cookie; + + return data->consume_entry(data->cookie, state->common.pc, 0, + state->common.fp); +} + +noinline noinstr void arch_bpf_stack_walk(bool (*consume_entry)(void *cookie, u64 ip, u64 sp, + u64 fp), void *cookie) +{ + struct bpf_unwind_consume_entry_data data = { + .consume_entry = consume_entry, + .cookie = cookie, + }; + + kunwind_stack_walk(arch_bpf_unwind_consume_entry, &data, current, NULL); +} + static bool dump_backtrace_entry(void *arg, unsigned long where) { char *loglvl = arg;