[RFC PATCH v2 02/31] x86: tracing: Add ftrace_regs definition in the header
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2023-11-08 14:24:53
Also in:
bpf, lkml
Subsystem:
function hooks (ftrace), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Steven Rostedt, Masami Hiramatsu, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 v2: - Newly added. --- arch/x86/include/asm/ftrace.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 897cf02c20b1..fc60974a1d89 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 and rsp. + * Also orig_ax is used for passing direct trampoline address. + * x86_32 doesn't support ftrace_regs. + */ struct pt_regs regs; };