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Message-ID: <173313812773.412.11234992239446433826.tip-bot2@tip-bot2>
Date: Mon, 02 Dec 2024 11:15:27 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject:
[tip: objtool/core] objtool: Convert ANNOTATE_RETPOLINE_SAFE to ANNOTATE
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: bf5febebd99fddfc6226a94e937d38a8d470b24e
Gitweb: https://git.kernel.org/tip/bf5febebd99fddfc6226a94e937d38a8d470b24e
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 28 Nov 2024 10:38:54 +01:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 02 Dec 2024 12:01:41 +01:00
objtool: Convert ANNOTATE_RETPOLINE_SAFE to ANNOTATE
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>
Link: https://lore.kernel.org/r/20241128094311.145275669@infradead.org
---
arch/x86/include/asm/nospec-branch.h | 13 +------
include/linux/objtool_types.h | 1 +-
tools/include/linux/objtool_types.h | 1 +-
tools/objtool/check.c | 52 +++++++++------------------
4 files changed, 22 insertions(+), 45 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 96b410b..50340a1 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -184,12 +184,7 @@
* objtool the subsequent indirect jump/call is vouched safe for retpoline
* builds.
*/
-.macro ANNOTATE_RETPOLINE_SAFE
-.Lhere_\@:
- .pushsection .discard.retpoline_safe
- .long .Lhere_\@
- .popsection
-.endm
+#define ANNOTATE_RETPOLINE_SAFE ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE
/*
* (ab)use RETPOLINE_SAFE on RET to annotate away 'bare' RET instructions
@@ -350,11 +345,7 @@
#else /* __ASSEMBLY__ */
-#define ANNOTATE_RETPOLINE_SAFE \
- "999:\n\t" \
- ".pushsection .discard.retpoline_safe\n\t" \
- ".long 999b\n\t" \
- ".popsection\n\t"
+#define ANNOTATE_RETPOLINE_SAFE ASM_ANNOTATE(ANNOTYPE_RETPOLINE_SAFE)
typedef u8 retpoline_thunk_t[RETPOLINE_THUNK_SIZE];
extern retpoline_thunk_t __x86_indirect_thunk_array[];
diff --git a/include/linux/objtool_types.h b/include/linux/objtool_types.h
index 4884f8c..1b34836 100644
--- a/include/linux/objtool_types.h
+++ b/include/linux/objtool_types.h
@@ -58,5 +58,6 @@ struct unwind_hint {
* Annotate types
*/
#define ANNOTYPE_NOENDBR 1
+#define ANNOTYPE_RETPOLINE_SAFE 2
#endif /* _LINUX_OBJTOOL_TYPES_H */
diff --git a/tools/include/linux/objtool_types.h b/tools/include/linux/objtool_types.h
index 4884f8c..1b34836 100644
--- a/tools/include/linux/objtool_types.h
+++ b/tools/include/linux/objtool_types.h
@@ -58,5 +58,6 @@ struct unwind_hint {
* Annotate types
*/
#define ANNOTYPE_NOENDBR 1
+#define ANNOTYPE_RETPOLINE_SAFE 2
#endif /* _LINUX_OBJTOOL_TYPES_H */
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index a74ff26..c5b5230 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2373,12 +2373,12 @@ static int read_unwind_hints(struct objtool_file *file)
return 0;
}
-static int read_annotate(struct objtool_file *file, void (*func)(int type, struct instruction *insn))
+static int read_annotate(struct objtool_file *file, int (*func)(int type, struct instruction *insn))
{
struct section *sec;
struct instruction *insn;
struct reloc *reloc;
- int type;
+ int type, ret;
sec = find_section_by_name(file->elf, ".discard.annotate_insn");
if (!sec)
@@ -2406,53 +2406,37 @@ static int read_annotate(struct objtool_file *file, void (*func)(int type, struc
return -1;
}
- func(type, insn);
+ ret = func(type, insn);
+ if (ret < 0)
+ return ret;
}
return 0;
}
-static void __annotate_noendbr(int type, struct instruction *insn)
+static int __annotate_noendbr(int type, struct instruction *insn)
{
if (type != ANNOTYPE_NOENDBR)
- return;
+ return 0;
insn->noendbr = 1;
+ return 0;
}
-static int read_retpoline_hints(struct objtool_file *file)
+static int __annotate_retpoline_safe(int type, struct instruction *insn)
{
- struct section *rsec;
- struct instruction *insn;
- struct reloc *reloc;
-
- rsec = find_section_by_name(file->elf, ".rela.discard.retpoline_safe");
- if (!rsec)
+ if (type != ANNOTYPE_RETPOLINE_SAFE)
return 0;
- for_each_reloc(rsec, reloc) {
- if (reloc->sym->type != STT_SECTION) {
- WARN("unexpected relocation symbol type in %s", rsec->name);
- return -1;
- }
-
- insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
- if (!insn) {
- WARN("bad .discard.retpoline_safe entry");
- return -1;
- }
-
- if (insn->type != INSN_JUMP_DYNAMIC &&
- insn->type != INSN_CALL_DYNAMIC &&
- insn->type != INSN_RETURN &&
- insn->type != INSN_NOP) {
- WARN_INSN(insn, "retpoline_safe hint not an indirect jump/call/ret/nop");
- return -1;
- }
-
- insn->retpoline_safe = true;
+ if (insn->type != INSN_JUMP_DYNAMIC &&
+ insn->type != INSN_CALL_DYNAMIC &&
+ insn->type != INSN_RETURN &&
+ insn->type != INSN_NOP) {
+ WARN_INSN(insn, "retpoline_safe hint not an indirect jump/call/ret/nop");
+ return -1;
}
+ insn->retpoline_safe = true;
return 0;
}
@@ -2742,7 +2726,7 @@ static int decode_sections(struct objtool_file *file)
if (ret)
return ret;
- ret = read_retpoline_hints(file);
+ ret = read_annotate(file, __annotate_retpoline_safe);
if (ret)
return ret;
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