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[v6,04/36] x86: tracing: Add ftrace_regs definition in the header

Message ID 170505429822.459169.14866081576830532227.stgit@devnote2 (mailing list archive)
State Not Applicable
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Commit Message

Masami Hiramatsu (Google) Jan. 12, 2024, 10:11 a.m. UTC 
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Add ftrace_regs definition for x86_64 in the ftrace header to
clarify what register will be accessible from ftrace_regs.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 Changes in v3:
  - Add rip to be saved.
 Changes in v2:
  - Newly added.
---
 arch/x86/include/asm/ftrace.h |    6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index cf88cc8cc74d..c88bf47f46da 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -36,6 +36,12 @@  static inline unsigned long ftrace_call_adjust(unsigned long addr)
 
 #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
 struct ftrace_regs {
+	/*
+	 * On the x86_64, the ftrace_regs saves;
+	 * rax, rcx, rdx, rdi, rsi, r8, r9, rbp, rip and rsp.
+	 * Also orig_ax is used for passing direct trampoline address.
+	 * x86_32 doesn't support ftrace_regs.
+	 */
 	struct pt_regs		regs;
 };