linux-kernel - [RFC][PATCH v5 17/51] objtool: mcount: Stop using ehdr in find_section_sym

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Message-ID: <0a0a522dcbe7038109bd97571c965a2afba0123c.1592510545.git.mhelsley@vmware.com>
Date:   Thu, 18 Jun 2020 13:38:03 -0700
From:   Matt Helsley <mhelsley@...are.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Julien Thierry <jthierry@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Matt Helsley <mhelsley@...are.com>
Subject: [RFC][PATCH v5 17/51] objtool: mcount: Stop using ehdr in find_section_sym_index

We can use the objtool GElf_Ehdr structure to access ehdr here.
This makes the function completely independent of the old
recordmcount ELF wrapper. The next step will be to promote it
to the C file.

Signed-off-by: Matt Helsley <mhelsley@...are.com>
---
 tools/objtool/recordmcount.h | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tools/objtool/recordmcount.h b/tools/objtool/recordmcount.h
index 941f96e4f74b..cf420f9f64b0 100644
--- a/tools/objtool/recordmcount.h
+++ b/tools/objtool/recordmcount.h
@@ -225,7 +225,7 @@ static uint_t *sift_rel_mcount(uint_t *mlocp,
 			       Elf_Rel **const mrelpp,
 			       const struct section * const rels,
 			       unsigned const recsym_index,
-			       uint_t const recval,
+			       unsigned long const recval,
 			       unsigned const reltype)
 {
 	uint_t *const mloc0 = mlocp;
@@ -319,9 +319,8 @@ static int nop_mcount(struct section * const rels,
  */
 static int find_section_sym_index(unsigned const txtndx,
 				char const *const txtname,
-				uint_t *const recvalp,
-				unsigned int *sym_index,
-				Elf_Ehdr const *const ehdr)
+				unsigned long *const recvalp,
+				unsigned int *sym_index)
 {
 	struct symbol *sym;
 	struct section *txts = find_section_by_index(lf, txtndx);
@@ -336,7 +335,7 @@ static int find_section_sym_index(unsigned const txtndx,
 		/* avoid symbols with weak binding */
 		if ((sym->bind == STB_LOCAL) || (sym->bind == STB_GLOBAL)) {
 			/* function symbols on ARM have quirks, avoid them */
-			if (w2(ehdr->e_machine) == EM_ARM
+			if (lf->ehdr.e_machine == EM_ARM
 			    && sym->type == STT_FUNC)
 				continue;
 
@@ -424,12 +423,12 @@ static int do_func(Elf_Ehdr *const ehdr,
 
 		txtname = has_rel_mcount(sec);
 		if (txtname && is_mcounted_section_name(txtname)) {
+			unsigned long recval = 0;
 			unsigned int recsym;
-			uint_t recval = 0;
 
 			symsec_sh_link = sec->sh.sh_link;
 			result = find_section_sym_index(sec->sh.sh_info,
-						txtname, &recval, &recsym, ehdr);
+						txtname, &recval, &recsym);
 			if (result)
 				goto out;
 
-- 
2.20.1