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Wed, 22 Jul 2026 07:01:13 -0700 (PDT) From: Varun R Mallya To: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, bjorn@kernel.org, pulehui@huawei.com Cc: alex@ghiti.fr, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, puranjay@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, varunrmallya@gmail.com Subject: [PATCH bpf-next v3 3/6] riscv, stacktrace: Implement arch_bpf_stack_walk() for BPF Date: Wed, 22 Jul 2026 19:30:10 +0530 Message-ID: <20260722140015.1982158-4-varunrmallya@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260722140015.1982158-1-varunrmallya@gmail.com> References: <20260722140015.1982158-1-varunrmallya@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 This will be used by bpf_throw() to unwind till the program marked as exception boundary and run the exception callback with the stack of the main program. This is a wrapper around walk_stackframe(), which now passes (pc, sp and fp) to it's consume callback. Signed-off-by: Varun R Mallya --- arch/riscv/kernel/stacktrace.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c index 30b369dd2815..c0f2393e5163 100644 --- a/arch/riscv/kernel/stacktrace.c +++ b/arch/riscv/kernel/stacktrace.c @@ -5,6 +5,7 @@ */ #include +#include #include #include #include @@ -104,6 +105,30 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs, } } +struct bpf_unwind_consume_entry_data { + bool (*consume_entry)(void *cookie, u64 ip, u64 sp, u64 fp); + void *cookie; +}; + +static bool bpf_unwind_consume_entry(void *arg, unsigned long pc, + unsigned long sp, unsigned long fp) +{ + struct bpf_unwind_consume_entry_data *data = arg; + + return data->consume_entry(data->cookie, pc, sp, fp); +} + +void notrace arch_bpf_stack_walk(bool (*consume_fn)(void *cookie, u64 ip, u64 sp, u64 bp), + void *cookie) +{ + struct bpf_unwind_consume_entry_data data = { + .consume_entry = consume_fn, + .cookie = cookie, + }; + + walk_stackframe(current, NULL, bpf_unwind_consume_entry, &data); +} + #else /* !CONFIG_FRAME_POINTER */ void notrace walk_stackframe(struct task_struct *task, -- 2.55.0