From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
Ananth N Mavinakayanahalli <ananth@linux.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, mhiramat@kernel.org,
Sven Schnelle <svens@linux.ibm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 5/9] arm64: kprobes: Make a frame pointer on __kretprobe_trampoline
Date: Thu, 21 Oct 2021 09:55:00 +0900 [thread overview]
Message-ID: <163477770064.264901.14799557129514500033.stgit@devnote2> (raw)
In-Reply-To: <163477765570.264901.3851692300287671122.stgit@devnote2>
Make a frame pointer (make the x29 register points the
address of pt_regs->regs[29]) on __kretprobe_trampoline.
This frame pointer will be used by the stacktracer when it is
called from the kretprobe handlers. In this case, the stack
tracer will unwind stack to trampoline_probe_handler() and
find the next frame pointer in the stack frame of the
__kretprobe_trampoline().
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
---
arch/arm64/kernel/probes/kprobes_trampoline.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kernel/probes/kprobes_trampoline.S b/arch/arm64/kernel/probes/kprobes_trampoline.S
index 520ee8711db1..9a6499bed58b 100644
--- a/arch/arm64/kernel/probes/kprobes_trampoline.S
+++ b/arch/arm64/kernel/probes/kprobes_trampoline.S
@@ -66,6 +66,9 @@ SYM_CODE_START(__kretprobe_trampoline)
save_all_base_regs
+ /* Setup a frame pointer. */
+ add x29, sp, #S_FP
+
mov x0, sp
bl trampoline_probe_handler
/*
@@ -74,6 +77,7 @@ SYM_CODE_START(__kretprobe_trampoline)
*/
mov lr, x0
+ /* The frame pointer (x29) is restored with other registers. */
restore_all_base_regs
add sp, sp, #PT_REGS_SIZE
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next prev parent reply other threads:[~2021-10-21 0:57 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 0:54 [PATCH v3 0/9] kprobes: Make KUnit and add stacktrace on kretprobe tests Masami Hiramatsu
2021-10-21 0:54 ` [PATCH v3 1/9] kprobes: convert tests to kunit Masami Hiramatsu
2021-10-21 0:54 ` [PATCH v3 2/9] kprobes: Add a test case for stacktrace from kretprobe handler Masami Hiramatsu
2021-10-22 16:15 ` Steven Rostedt
2021-10-22 18:23 ` Steven Rostedt
2021-10-25 2:34 ` Masami Hiramatsu
2021-10-21 0:54 ` [PATCH v3 3/9] x86/unwind: Compile kretprobe fixup code only if CONFIG_KRETPROBES=y Masami Hiramatsu
2021-10-21 0:54 ` [PATCH v3 4/9] arm64: kprobes: Record frame pointer with kretprobe instance Masami Hiramatsu
2021-10-21 0:55 ` Masami Hiramatsu [this message]
2021-10-21 0:55 ` [PATCH v3 6/9] arm64: Recover kretprobe modified return address in stacktrace Masami Hiramatsu
2021-10-21 10:15 ` Will Deacon
2021-10-21 14:26 ` Masami Hiramatsu
2021-10-21 14:49 ` Steven Rostedt
2021-10-21 16:52 ` Will Deacon
2021-10-21 16:59 ` Steven Rostedt
2021-10-21 18:38 ` Steven Rostedt
2021-10-21 0:55 ` [PATCH v3 7/9] ARM: clang: Do not rely on lr register for stacktrace Masami Hiramatsu
2021-10-21 0:55 ` [PATCH v3 8/9] ARM: kprobes: Make a frame pointer on __kretprobe_trampoline Masami Hiramatsu
2021-12-03 20:37 ` Arnd Bergmann
2021-12-04 8:45 ` Ard Biesheuvel
2021-12-04 12:08 ` Arnd Bergmann
2021-12-08 12:26 ` Masami Hiramatsu
2021-10-21 0:55 ` [PATCH v3 9/9] ARM: Recover kretprobe modified return address in stacktrace Masami Hiramatsu
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