linux-kernel - [PATCH v2 14/16] objtool: Add arch specific function arch_ftrace

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Message-Id: <20220829055223.24767-15-sv@linux.ibm.com>
Date:   Mon, 29 Aug 2022 11:22:21 +0530
From:   Sathvika Vasireddy <sv@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, aik@...abs.ru, mpe@...erman.id.au,
        mingo@...hat.com, christophe.leroy@...roup.eu, rostedt@...dmis.org,
        mbenes@...e.cz, npiggin@...il.com, chenzhongjin@...wei.com,
        naveen.n.rao@...ux.vnet.ibm.com, sv@...ux.ibm.com
Subject: [PATCH v2 14/16] objtool: Add arch specific function arch_ftrace_match()

Add architecture specific function to look for
relocation records pointing to arch specific
symbols.

Suggested-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Sathvika Vasireddy <sv@...ux.ibm.com>
---
 tools/objtool/arch/x86/decode.c      | 8 ++++++++
 tools/objtool/check.c                | 2 +-
 tools/objtool/include/objtool/arch.h | 2 ++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index c260006106be..025598b6b703 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -23,6 +23,14 @@
 #include <objtool/builtin.h>
 #include <arch/elf.h>
 
+bool arch_ftrace_match(char *name)
+{
+	if (!strcmp(name, "__fentry__"))
+		return true;
+
+	return false;
+}
+
 static int is_x86_64(const struct elf *elf)
 {
 	switch (elf->ehdr.e_machine) {
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index f1d055467926..01ff7504f18d 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2294,7 +2294,7 @@ static int classify_symbols(struct objtool_file *file)
 			if (arch_is_rethunk(func))
 				func->return_thunk = true;
 
-			if (!strcmp(func->name, "__fentry__"))
+			if (arch_ftrace_match(func->name))
 				func->fentry = true;
 
 			if (is_profiling_func(func->name))
diff --git a/tools/objtool/include/objtool/arch.h b/tools/objtool/include/objtool/arch.h
index beb2f3aa94ff..2ba4b9897285 100644
--- a/tools/objtool/include/objtool/arch.h
+++ b/tools/objtool/include/objtool/arch.h
@@ -69,6 +69,8 @@ struct stack_op {
 
 struct instruction;
 
+bool arch_ftrace_match(char *name);
+
 void arch_initial_func_cfi_state(struct cfi_init_state *state);
 
 int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
-- 
2.31.1