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From:   Josh Poimboeuf <jpoimboe@kernel.org>
To:     x86@kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Miroslav Benes <mbenes@suse.cz>
Subject: [PATCH 15/22] objtool: Get rid of reloc->type
Date:   Tue, 30 May 2023 10:21:07 -0700
Message-Id: <d1c1f8da31e4f052a2478aea585fcf355cacc53a.1685464332.git.jpoimboe@kernel.org>
In-Reply-To: <cover.1685464332.git.jpoimboe@kernel.org>
References: <cover.1685464332.git.jpoimboe@kernel.org>
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Get the type from the embedded GElf_Rel[a] struct.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 tools/objtool/arch/x86/decode.c     |  2 +-
 tools/objtool/arch/x86/special.c    |  4 ++--
 tools/objtool/check.c               | 11 ++++++-----
 tools/objtool/elf.c                 |  6 ++----
 tools/objtool/include/objtool/elf.h | 11 ++++++++++-
 5 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 9ef024fd648c..ffb12e83b238 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -84,7 +84,7 @@ bool arch_pc_relative_reloc(struct reloc *reloc)
 	 * All relocation types where P (the address of the target)
 	 * is included in the computation.
 	 */
-	switch (reloc->type) {
+	switch (reloc_type(reloc)) {
 	case R_X86_64_PC8:
 	case R_X86_64_PC16:
 	case R_X86_64_PC32:
diff --git a/tools/objtool/arch/x86/special.c b/tools/objtool/arch/x86/special.c
index 7c97b7391279..1a54a249cb50 100644
--- a/tools/objtool/arch/x86/special.c
+++ b/tools/objtool/arch/x86/special.c
@@ -108,7 +108,7 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
 	table_offset = text_reloc->addend;
 	table_sec = text_reloc->sym->sec;
 
-	if (text_reloc->type == R_X86_64_PC32)
+	if (reloc_type(text_reloc) == R_X86_64_PC32)
 		table_offset += 4;
 
 	/*
@@ -138,7 +138,7 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
 	 * indicates a rare GCC quirk/bug which can leave dead
 	 * code behind.
 	 */
-	if (text_reloc->type == R_X86_64_PC32)
+	if (reloc_type(text_reloc) == R_X86_64_PC32)
 		file->ignore_unreachables = true;
 
 	return rodata_reloc;
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 440c326121d4..1d794d15bc53 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -957,7 +957,7 @@ static int create_mcount_loc_sections(struct objtool_file *file)
 		if (!reloc)
 			return -1;
 
-		reloc->type = addr_size == 8 ? R_ABS64 : R_ABS32;
+		set_reloc_type(reloc, addr_size == 8 ? R_ABS64 : R_ABS32);
 
 		idx++;
 	}
@@ -1353,7 +1353,7 @@ 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;
+			set_reloc_type(reloc, R_NONE);
 			elf_write_reloc(file->elf, reloc);
 		}
 
@@ -1382,7 +1382,7 @@ static void annotate_call_site(struct objtool_file *file,
 			WARN_INSN(insn, "tail call to __fentry__ !?!?");
 		if (opts.mnop) {
 			if (reloc) {
-				reloc->type = R_NONE;
+				set_reloc_type(reloc, R_NONE);
 				elf_write_reloc(file->elf, reloc);
 			}
 
@@ -1864,7 +1864,7 @@ static int handle_jump_alt(struct objtool_file *file,
 		struct reloc *reloc = insn_reloc(file, orig_insn);
 
 		if (reloc) {
-			reloc->type = R_NONE;
+			set_reloc_type(reloc, R_NONE);
 			elf_write_reloc(file->elf, reloc);
 		}
 		elf_write_insn(file->elf, orig_insn->sec,
@@ -4268,7 +4268,8 @@ static int validate_ibt_insn(struct objtool_file *file, struct instruction *insn
 			continue;
 
 		off = reloc->sym->offset;
-		if (reloc->type == R_X86_64_PC32 || reloc->type == R_X86_64_PLT32)
+		if (reloc_type(reloc) == R_X86_64_PC32 ||
+		    reloc_type(reloc) == R_X86_64_PLT32)
 			off += arch_dest_reloc_offset(reloc->addend);
 		else
 			off += reloc->addend;
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 2b45460225d1..be9d24dcdf56 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -541,6 +541,7 @@ static int elf_update_sym_relocs(struct elf *elf, struct symbol *sym)
 	struct reloc *reloc;
 
 	list_for_each_entry(reloc, &sym->reloc_list, sym_reloc_entry) {
+		reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc_type(reloc));
 		if (elf_write_reloc(elf, reloc))
 			return -1;
 	}
@@ -831,11 +832,11 @@ static struct reloc *elf_init_reloc(struct elf *elf, struct section *rsec,
 	}
 
 	reloc->sec = rsec;
-	reloc->type = type;
 	reloc->sym = sym;
 	reloc->addend = addend;
 
 	reloc->rel.r_offset = offset;
+	reloc->rel.r_info = GELF_R_INFO(sym->idx, type);
 
 	if (elf_write_reloc(elf, reloc))
 		return NULL;
@@ -910,7 +911,6 @@ static int read_reloc(struct section *rsec, int i, struct reloc *reloc)
 		return -1;
 	}
 
-	reloc->type = GELF_R_TYPE(reloc->rel.r_info);
 	reloc->addend = rela ? reloc->rela.r_addend : 0;
 
 	return 0;
@@ -1231,8 +1231,6 @@ int elf_write_reloc(struct elf *elf, struct reloc *reloc)
 	struct section *rsec = reloc->sec;
 	int ret;
 
-	reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
-
 	if (rsec->sh.sh_type == SHT_RELA) {
 		reloc->rela.r_addend = reloc->addend;
 		ret = gelf_update_rela(rsec->data, reloc_idx(reloc), &reloc->rela);
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 2070860a099e..41d2149f8bb8 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -76,7 +76,6 @@ struct reloc {
 	struct symbol *sym;
 	struct list_head sym_reloc_entry;
 	s64 addend;
-	unsigned int type;
 	bool jump_table_start;
 };
 
@@ -208,6 +207,16 @@ static inline unsigned long reloc_offset(struct reloc *reloc)
 	return reloc->rel.r_offset;
 }
 
+static inline unsigned int reloc_type(struct reloc *reloc)
+{
+	return GELF_R_TYPE(reloc->rel.r_info);
+}
+
+static inline void set_reloc_type(struct reloc *reloc, int type)
+{
+	reloc->rel.r_info = GELF_R_INFO(GELF_R_SYM(reloc->rel.r_info), type);
+}
+
 #define for_each_sec(file, sec)						\
 	list_for_each_entry(sec, &file->elf->sections, list)
 
-- 
2.40.1