linux-kernel - [PATCH 5/5] LoongArch: Abstract DYNAMIC_FTRACE_WITH

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Date:   Wed, 26 Apr 2023 09:49:14 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn,
        Qing Zhang <zhangqing@...ngson.cn>
Subject: [PATCH 5/5] LoongArch: Abstract DYNAMIC_FTRACE_WITH_ARGS accesses

From: Qing Zhang <zhangqing@...ngson.cn>

1.Adds new ftrace_regs_{get,set}_*() helpers which can be used to manipulate
ftrace_regs. When CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS=y, these can always
be used on any ftrace_regs, and when CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS=n
these can be used when regs are available. A new ftrace_regs_has_args(fregs)
helper is added which code can use to check when these are usable.
2.Prepare ftrace_regs_set_instruction_pointer support in advance.

Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
---
 arch/loongarch/include/asm/ftrace.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h
index f789e680f633..30ee01243416 100644
--- a/arch/loongarch/include/asm/ftrace.h
+++ b/arch/loongarch/include/asm/ftrace.h
@@ -54,6 +54,31 @@ static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *
 	return &fregs->regs;
 }
 
+static __always_inline void
+ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
+				    unsigned long ip)
+{
+	regs_set_return_value(&fregs->regs, ip);
+}
+
+static __always_inline unsigned long
+ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs)
+{
+	return instruction_pointer(&fregs->regs);
+}
+
+#define ftrace_regs_get_argument(fregs, n) \
+	regs_get_kernel_argument(&(fregs)->regs, n)
+#define ftrace_regs_get_stack_pointer(fregs) \
+	kernel_stack_pointer(&(fregs)->regs)
+#define ftrace_regs_return_value(fregs) \
+	regs_return_value(&(fregs)->regs)
+#define ftrace_regs_set_return_value(fregs, ret) \
+	regs_set_return_value(&(fregs)->regs, ret)
+#define ftrace_override_function_with_return(fregs) \
+	override_function_with_return(&(fregs)->regs)
+#define ftrace_regs_query_register_offset(name) \
+
 #define ftrace_graph_func ftrace_graph_func
 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 		       struct ftrace_ops *op, struct ftrace_regs *fregs);
-- 
2.37.1