linux-kernel - [PATCH v2 4/8] objtool: introduce function elf_reloc_set

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Message-Id: <20221216-objtool-memory-v2-4-17968f85a464@weissschuh.net>
Date:   Tue, 27 Dec 2022 16:01:00 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 4/8] objtool: introduce function elf_reloc_set_type

An upcoming patch needs to perform validation when setting reloc->type
so introduce a helper to contain this validation.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/objtool/check.c               |  6 +++---
 tools/objtool/elf.c                 | 11 ++++++++---
 tools/objtool/include/objtool/elf.h |  2 ++
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4350be739f4f..971ee6826de7 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1355,7 +1355,7 @@ static void annotate_call_site(struct objtool_file *file,
 	 */
 	if (opts.hack_noinstr && insn->sec->noinstr && sym->profiling_func) {
 		if (reloc) {
-			reloc->type = R_NONE;
+			elf_reloc_set_type(reloc, R_NONE);
 			elf_write_reloc(file->elf, reloc);
 		}
 
@@ -1384,7 +1384,7 @@ static void annotate_call_site(struct objtool_file *file,
 			WARN_FUNC("Tail call to __fentry__ !?!?", insn->sec, insn->offset);
 		if (opts.mnop) {
 			if (reloc) {
-				reloc->type = R_NONE;
+				elf_reloc_set_type(reloc, R_NONE);
 				elf_write_reloc(file->elf, reloc);
 			}
 
@@ -1863,7 +1863,7 @@ static int handle_jump_alt(struct objtool_file *file,
 		struct reloc *reloc = insn_reloc(file, orig_insn);
 
 		if (reloc) {
-			reloc->type = R_NONE;
+			elf_reloc_set_type(reloc, R_NONE);
 			elf_write_reloc(file->elf, reloc);
 		}
 		elf_write_insn(file->elf, orig_insn->sec,
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 9c326efb8cd9..ee355beb0d82 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -555,7 +555,7 @@ int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
 
 	reloc->sec = sec->reloc;
 	reloc->offset = offset;
-	reloc->type = type;
+	elf_reloc_set_type(reloc, type);
 	reloc->sym = sym;
 	reloc->addend = addend;
 
@@ -872,7 +872,7 @@ static int read_rel_reloc(struct section *sec, int i, struct reloc *reloc, unsig
 		WARN_ELF("gelf_getrel");
 		return -1;
 	}
-	reloc->type = GELF_R_TYPE(reloc->rel.r_info);
+	elf_reloc_set_type(reloc, GELF_R_TYPE(reloc->rel.r_info));
 	reloc->addend = 0;
 	reloc->offset = reloc->rel.r_offset;
 	*symndx = GELF_R_SYM(reloc->rel.r_info);
@@ -885,7 +885,7 @@ static int read_rela_reloc(struct section *sec, int i, struct reloc *reloc, unsi
 		WARN_ELF("gelf_getrela");
 		return -1;
 	}
-	reloc->type = GELF_R_TYPE(reloc->rela.r_info);
+	elf_reloc_set_type(reloc, GELF_R_TYPE(reloc->rela.r_info));
 	reloc->addend = reloc->rela.r_addend;
 	reloc->offset = reloc->rela.r_offset;
 	*symndx = GELF_R_SYM(reloc->rela.r_info);
@@ -1471,3 +1471,8 @@ void elf_close(struct elf *elf)
 	free(elf->section_data);
 	free(elf);
 }
+
+void elf_reloc_set_type(struct reloc *reloc, int type)
+{
+	reloc->type = type;
+}
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 1c90f0ac0d53..33ec6cf72325 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -83,6 +83,8 @@ struct reloc {
 	bool jump_table_start;
 };
 
+void elf_reloc_set_type(struct reloc *reloc, int type);
+
 #define ELF_HASH_BITS	20
 
 struct elf {

-- 
2.39.0