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Message-ID: <158759427538.28353.1463637182355148220.tip-bot2@tip-bot2>
Date: Wed, 22 Apr 2020 22:24:35 -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>,
Miroslav Benes <mbenes@...e.cz>,
Alexandre Chartre <alexandre.chartre@...cle.com>,
Josh Poimboeuf <jpoimboe@...hat.com>, x86 <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/core] objtool: Remove SAVE/RESTORE hints
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: 4dde773748d737bae48f21768fc511e7c1c02a97
Gitweb: https://git.kernel.org/tip/4dde773748d737bae48f21768fc511e7c1c02a97
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed, 01 Apr 2020 16:54:26 +02:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 22 Apr 2020 23:10:06 +02:00
objtool: Remove SAVE/RESTORE hints
The SAVE/RESTORE hints are now unused; remove them.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lkml.kernel.org/r/20200416115118.926738768@infradead.org
---
arch/x86/include/asm/orc_types.h | 4 +--
arch/x86/include/asm/unwind_hints.h | 27 +----------------
tools/arch/x86/include/asm/orc_types.h | 4 +--
tools/objtool/check.c | 42 +------------------------
tools/objtool/check.h | 2 +-
5 files changed, 6 insertions(+), 73 deletions(-)
diff --git a/arch/x86/include/asm/orc_types.h b/arch/x86/include/asm/orc_types.h
index 5f18ca7..d255349 100644
--- a/arch/x86/include/asm/orc_types.h
+++ b/arch/x86/include/asm/orc_types.h
@@ -58,9 +58,7 @@
#define ORC_TYPE_CALL 0
#define ORC_TYPE_REGS 1
#define ORC_TYPE_REGS_IRET 2
-#define UNWIND_HINT_TYPE_SAVE 3
-#define UNWIND_HINT_TYPE_RESTORE 4
-#define UNWIND_HINT_TYPE_RET_OFFSET 5
+#define UNWIND_HINT_TYPE_RET_OFFSET 3
#ifndef __ASSEMBLY__
/*
diff --git a/arch/x86/include/asm/unwind_hints.h b/arch/x86/include/asm/unwind_hints.h
index aabf7ac..7d903fd 100644
--- a/arch/x86/include/asm/unwind_hints.h
+++ b/arch/x86/include/asm/unwind_hints.h
@@ -86,15 +86,6 @@
UNWIND_HINT sp_offset=\sp_offset
.endm
-.macro UNWIND_HINT_SAVE
- UNWIND_HINT type=UNWIND_HINT_TYPE_SAVE
-.endm
-
-.macro UNWIND_HINT_RESTORE
- UNWIND_HINT type=UNWIND_HINT_TYPE_RESTORE
-.endm
-
-
/*
* RET_OFFSET: Used on instructions that terminate a function; mostly RETURN
* and sibling calls. On these, sp_offset denotes the expected offset from
@@ -104,24 +95,6 @@
UNWIND_HINT type=UNWIND_HINT_TYPE_RET_OFFSET sp_offset=\sp_offset
.endm
-#else /* !__ASSEMBLY__ */
-
-#define UNWIND_HINT(sp_reg, sp_offset, type, end) \
- "987: \n\t" \
- ".pushsection .discard.unwind_hints\n\t" \
- /* struct unwind_hint */ \
- ".long 987b - .\n\t" \
- ".short " __stringify(sp_offset) "\n\t" \
- ".byte " __stringify(sp_reg) "\n\t" \
- ".byte " __stringify(type) "\n\t" \
- ".byte " __stringify(end) "\n\t" \
- ".balign 4 \n\t" \
- ".popsection\n\t"
-
-#define UNWIND_HINT_SAVE UNWIND_HINT(0, 0, UNWIND_HINT_TYPE_SAVE, 0)
-
-#define UNWIND_HINT_RESTORE UNWIND_HINT(0, 0, UNWIND_HINT_TYPE_RESTORE, 0)
-
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_UNWIND_HINTS_H */
diff --git a/tools/arch/x86/include/asm/orc_types.h b/tools/arch/x86/include/asm/orc_types.h
index 5f18ca7..d255349 100644
--- a/tools/arch/x86/include/asm/orc_types.h
+++ b/tools/arch/x86/include/asm/orc_types.h
@@ -58,9 +58,7 @@
#define ORC_TYPE_CALL 0
#define ORC_TYPE_REGS 1
#define ORC_TYPE_REGS_IRET 2
-#define UNWIND_HINT_TYPE_SAVE 3
-#define UNWIND_HINT_TYPE_RESTORE 4
-#define UNWIND_HINT_TYPE_RET_OFFSET 5
+#define UNWIND_HINT_TYPE_RET_OFFSET 3
#ifndef __ASSEMBLY__
/*
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index fe6ae45..7e67bdb 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1270,15 +1270,7 @@ static int read_unwind_hints(struct objtool_file *file)
cfa = &insn->state.cfa;
- if (hint->type == UNWIND_HINT_TYPE_SAVE) {
- insn->save = true;
- continue;
-
- } else if (hint->type == UNWIND_HINT_TYPE_RESTORE) {
- insn->restore = true;
- insn->hint = true;
-
- } else if (hint->type == UNWIND_HINT_TYPE_RET_OFFSET) {
+ if (hint->type == UNWIND_HINT_TYPE_RET_OFFSET) {
insn->ret_offset = hint->sp_offset;
continue;
}
@@ -2129,37 +2121,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
return 0;
}
- if (insn->hint) {
- if (insn->restore) {
- struct instruction *save_insn, *i;
-
- i = insn;
- save_insn = NULL;
- sym_for_each_insn_continue_reverse(file, func, i) {
- if (i->save) {
- save_insn = i;
- break;
- }
- }
-
- if (!save_insn) {
- WARN_FUNC("no corresponding CFI save for CFI restore",
- sec, insn->offset);
- return 1;
- }
-
- if (!save_insn->visited) {
- WARN_FUNC("objtool isn't smart enough to handle this CFI save/restore combo",
- sec, insn->offset);
- return 1;
- }
-
- insn->state = save_insn->state;
- }
-
+ if (insn->hint)
state = insn->state;
-
- } else
+ else
insn->state = state;
insn->visited |= visited;
diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index 81ce27e..7c30760 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -34,7 +34,7 @@ struct instruction {
enum insn_type type;
unsigned long immediate;
bool alt_group, dead_end, ignore, ignore_alts;
- bool hint, save, restore;
+ bool hint;
bool retpoline_safe;
u8 visited;
u8 ret_offset;
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