From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Will Deacon <will@kernel.org>
Subject: [for-next][PATCH 36/40] arm64: kprobes: Make a frame pointer on __kretprobe_trampoline
Date: Fri, 22 Oct 2021 16:48:32 -0400 [thread overview]
Message-ID: <20211022204844.821961287@goodmis.org> (raw)
In-Reply-To: <20211022204756.099054287@goodmis.org>
From: Masami Hiramatsu <mhiramat@kernel.org>
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>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.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
--
2.33.0
next prev parent reply other threads:[~2021-10-22 20:50 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-22 20:47 [for-next][PATCH 00/40] tracing: Updates for 5.16 Steven Rostedt
2021-10-22 20:47 ` [for-next][PATCH 01/40] tracing: Initialize upper and lower vars in pid_list_refill_irq() Steven Rostedt
2021-10-22 20:47 ` [for-next][PATCH 02/40] tracefs: Have tracefs directories not set OTH permission bits by default Steven Rostedt
2021-10-22 20:47 ` [for-next][PATCH 03/40] tracing: Disable "other" permission bits in the tracefs files Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 04/40] ftrace: Cleanup ftrace_dyn_arch_init() Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 05/40] bootconfig: Allocate xbc_data inside xbc_init() Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 06/40] bootconfig: Add xbc_get_info() for the node information Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 07/40] tools/bootconfig: Run test script when build all Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 08/40] bootconfig: Rename xbc_destroy_all() to xbc_exit() Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 09/40] bootconfig: Split parse-tree part from xbc_init Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 10/40] bootconfig: Remove unused debug function Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 11/40] tools/bootconfig: Print all error message in stderr Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 12/40] bootconfig: Replace u16 and u32 with uint16_t and uint32_t Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 13/40] bootconfig: Cleanup dummy headers in tools/bootconfig Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 14/40] ftrace: Add unit test for removing trace function Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 15/40] tracing: in_irq() cleanup Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 16/40] tracing: Use linker magic instead of recasting ftrace_ops_list_func() Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 17/40] tracing/cfi: Fix cmp_entries_* functions signature mismatch Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 18/40] tracing: Reuse logic from perfs get_recursion_context() Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 19/40] tracing/perf: Add interrupt_context_level() helper Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 20/40] x86/ftrace: Remove extra orig rax move Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 21/40] x86/ftrace: Remove fault protection code in prepare_ftrace_return Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 22/40] ftrace/x86_64: Have function graph tracer depend on DYNAMIC_FTRACE Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 23/40] x86/ftrace: Make function graph use ftrace directly Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 24/40] tracing: Add trampoline/graph selftest Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 25/40] tracing: Fix selftest config check for function graph start up test Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 26/40] ftrace: Add ftrace_add_rec_direct function Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 27/40] ftrace: Add multi direct register/unregister interface Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 28/40] ftrace: Add multi direct modify interface Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 29/40] ftrace/samples: Add multi direct interface test module Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 30/40] ftrace/direct: Do not disable when switching direct callers Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 31/40] tracing: Explain the trace recursion transition bit better Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 32/40] tracing: use %ps format string to print symbols Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 33/40] kprobes: convert tests to kunit Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 34/40] x86/unwind: Compile kretprobe fixup code only if CONFIG_KRETPROBES=y Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 35/40] arm64: kprobes: Record frame pointer with kretprobe instance Steven Rostedt
2021-10-22 20:48 ` Steven Rostedt [this message]
2021-10-22 20:48 ` [for-next][PATCH 37/40] arm64: Recover kretprobe modified return address in stacktrace Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 38/40] ARM: clang: Do not rely on lr register for stacktrace Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 39/40] ARM: kprobes: Make a frame pointer on __kretprobe_trampoline Steven Rostedt
2021-10-22 20:48 ` [for-next][PATCH 40/40] ARM: Recover kretprobe modified return address in stacktrace Steven Rostedt
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