From: Peter Zijlstra <peterz@infradead.org>
Date: Fri, 26 Mar 2021 15:12:08 +0000 (+0100)
Subject: objtool: Create reloc sections implicitly
X-Git-Tag: v5.10.133~122
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=b37c439250118f6fecfd6436d8b218a452ab6fa8;p=users%2Fdwmw2%2Flinux.git

objtool: Create reloc sections implicitly

commit d0c5c4cc73da0b05b0d9e5f833f2d859e1b45f8e upstream.

Have elf_add_reloc() create the relocation section implicitly.

Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151259.880174448@infradead.org
[bwh: Backported to 5.10: drop changes in create_mcount_loc_sections()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 76a63294d64e3..2cb4098590812 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -459,9 +459,6 @@ static int create_static_call_sections(struct objtool_file *file)
 	if (!sec)
 		return -1;
 
-	if (!elf_create_reloc_section(file->elf, sec, SHT_RELA))
-		return -1;
-
 	idx = 0;
 	list_for_each_entry(insn, &file->static_call_list, static_call_node) {
 
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 973f0c481bacc..b76d687bc962d 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -498,11 +498,18 @@ err:
 	return -1;
 }
 
+static struct section *elf_create_reloc_section(struct elf *elf,
+						struct section *base,
+						int reltype);
+
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
 		  unsigned int type, struct symbol *sym, int addend)
 {
 	struct reloc *reloc;
 
+	if (!sec->reloc && !elf_create_reloc_section(elf, sec, SHT_RELA))
+		return -1;
+
 	reloc = malloc(sizeof(*reloc));
 	if (!reloc) {
 		perror("malloc");
@@ -880,7 +887,7 @@ static struct section *elf_create_rela_reloc_section(struct elf *elf, struct sec
 	return sec;
 }
 
-struct section *elf_create_reloc_section(struct elf *elf,
+static struct section *elf_create_reloc_section(struct elf *elf,
 					 struct section *base,
 					 int reltype)
 {
diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h
index 825ad326201dc..463f329f1c665 100644
--- a/tools/objtool/elf.h
+++ b/tools/objtool/elf.h
@@ -122,7 +122,6 @@ static inline u32 reloc_hash(struct reloc *reloc)
 
 struct elf *elf_open_read(const char *name, int flags);
 struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr);
-struct section *elf_create_reloc_section(struct elf *elf, struct section *base, int reltype);
 
 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
 		  unsigned int type, struct symbol *sym, int addend);
diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 57de202c51b4c..671f3b296c1ad 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -222,8 +222,6 @@ int orc_create(struct objtool_file *file)
 	sec = elf_create_section(file->elf, ".orc_unwind_ip", 0, sizeof(int), nr);
 	if (!sec)
 		return -1;
-	if (!elf_create_reloc_section(file->elf, sec, SHT_RELA))
-		return -1;
 
 	/* Write ORC entries to sections: */
 	list_for_each_entry(entry, &orc_list, list) {