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Message-ID: <08657a8071475e802dd63e3392338a8f950b61bb.1725334260.git.jpoimboe@kernel.org>
Date: Mon, 2 Sep 2024 20:59:56 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: live-patching@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
x86@...nel.org,
Miroslav Benes <mbenes@...e.cz>,
Petr Mladek <pmladek@...e.com>,
Joe Lawrence <joe.lawrence@...hat.com>,
Jiri Kosina <jikos@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Marcos Paulo de Souza <mpdesouza@...e.com>,
Song Liu <song@...nel.org>
Subject: [RFC 13/31] objtool: Support references to all symbol types in special sections
Make the code simpler and more flexible.
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
tools/objtool/check.c | 74 +++++++++----------------------------------
1 file changed, 15 insertions(+), 59 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 92171ce458ec..9212b5edffc8 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -595,15 +595,7 @@ static int add_dead_ends(struct objtool_file *file)
goto reachable;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type == STT_SECTION) {
- offset = reloc_addend(reloc);
- } else if (reloc->sym->local_label) {
- offset = reloc->sym->offset;
- } else {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
-
+ offset = reloc->sym->offset + reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
@@ -635,15 +627,7 @@ static int add_dead_ends(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type == STT_SECTION) {
- offset = reloc_addend(reloc);
- } else if (reloc->sym->local_label) {
- offset = reloc->sym->offset;
- } else {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
-
+ offset = reloc->sym->offset + reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, offset);
if (insn)
insn = prev_insn_same_sec(file, insn);
@@ -1274,12 +1258,9 @@ static int add_ignore_alternatives(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.ignore_alts entry");
return -1;
@@ -2255,15 +2236,7 @@ static int read_unwind_hints(struct objtool_file *file)
return -1;
}
- if (reloc->sym->type == STT_SECTION) {
- offset = reloc_addend(reloc);
- } else if (reloc->sym->local_label) {
- offset = reloc->sym->offset;
- } else {
- WARN("unexpected relocation symbol type in %s", sec->rsec->name);
- return -1;
- }
-
+ offset = reloc->sym->offset + reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("can't find insn for unwind_hints[%d]", i);
@@ -2356,12 +2329,9 @@ static int read_retpoline_hints(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.retpoline_safe entry");
return -1;
@@ -2392,12 +2362,9 @@ static int read_instr_hints(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.instr_end entry");
return -1;
@@ -2411,12 +2378,9 @@ static int read_instr_hints(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.instr_begin entry");
return -1;
@@ -2439,12 +2403,9 @@ static int read_validate_unret_hints(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.instr_end entry");
return -1;
@@ -2468,14 +2429,9 @@ static int read_intra_function_calls(struct objtool_file *file)
for_each_reloc(rsec, reloc) {
unsigned long dest_off;
+ unsigned long offset = reloc->sym->offset + reloc_addend(reloc);
- if (!is_section_symbol(reloc->sym)) {
- WARN("unexpected relocation symbol type in %s",
- rsec->name);
- return -1;
- }
-
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
+ insn = find_insn(file, reloc->sym->sec, offset);
if (!insn) {
WARN("bad .discard.intra_function_call entry");
return -1;
--
2.45.2
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