From: Peter Zijlstra <peterz@infradead.org>
To: jpoimboe@redhat.com, alexandre.chartre@oracle.com
Cc: linux-kernel@vger.kernel.org, jthierry@redhat.com,
tglx@linutronix.de, x86@kernel.org, mbenes@suse.cz
Subject: [PATCH v2.1 01-B/14] objtool: Uniquely identify alternative instruction groups
Date: Wed, 29 Apr 2020 12:21:01 +0200 [thread overview]
Message-ID: <20200429102101.GK13592@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200428191101.886208539@infradead.org>
Subject: objtool: Uniquely identify alternative instruction groups
From: Alexandre Chartre <alexandre.chartre@oracle.com>
Date: Tue, 14 Apr 2020 12:36:11 +0200
From: Alexandre Chartre <alexandre.chartre@oracle.com>
Assign a unique identifier to every alternative instruction group in
order to be able to tell which instructions belong to what
alternative.
[peterz: extracted from a larger patch]
Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
tools/objtool/check.c | 26 ++++++++++++++++++++------
tools/objtool/check.h | 3 ++-
2 files changed, 22 insertions(+), 7 deletions(-)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -770,7 +770,9 @@ static int handle_group_alt(struct objto
struct instruction *orig_insn,
struct instruction **new_insn)
{
+ static unsigned int alt_group_next_index = 1;
struct instruction *last_orig_insn, *last_new_insn, *insn, *fake_jump = NULL;
+ unsigned int alt_group = alt_group_next_index++;
unsigned long dest_off;
last_orig_insn = NULL;
@@ -779,7 +781,7 @@ static int handle_group_alt(struct objto
if (insn->offset >= special_alt->orig_off + special_alt->orig_len)
break;
- insn->alt_group = true;
+ insn->alt_group = alt_group;
last_orig_insn = insn;
}
@@ -813,6 +815,7 @@ static int handle_group_alt(struct objto
}
last_new_insn = NULL;
+ alt_group = alt_group_next_index++;
insn = *new_insn;
sec_for_each_insn_from(file, insn) {
if (insn->offset >= special_alt->new_off + special_alt->new_len)
@@ -822,6 +825,7 @@ static int handle_group_alt(struct objto
insn->ignore = orig_insn->ignore_alts;
insn->func = orig_insn->func;
+ insn->alt_group = alt_group;
/*
* Since alternative replacement code is copy/pasted by the
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -30,12 +30,13 @@ struct instruction {
unsigned int len;
enum insn_type type;
unsigned long immediate;
- bool alt_group, dead_end, ignore, ignore_alts;
+ bool dead_end, ignore, ignore_alts;
bool hint;
bool retpoline_safe;
s8 instr;
u8 visited;
u8 ret_offset;
+ int alt_group;
struct symbol *call_dest;
struct instruction *jump_dest;
struct instruction *first_jump_src;
next prev parent reply other threads:[~2020-04-29 10:21 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 19:11 [PATCH v2 00/14] objtool vs retpoline Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 01/14] objtool: Allow branches within the same alternative Peter Zijlstra
2020-04-28 19:53 ` Josh Poimboeuf
2020-04-28 19:11 ` [PATCH v2 02/14] objtool: Fix ORC vs alternatives Peter Zijlstra
2020-04-28 19:55 ` Josh Poimboeuf
2020-04-29 14:33 ` Miroslav Benes
2020-04-29 15:51 ` Peter Zijlstra
2020-04-29 16:41 ` Miroslav Benes
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 03/14] x86,smap: Fix smap_{save,restore}() alternatives Peter Zijlstra
2020-04-29 0:54 ` Brian Gerst
2020-04-29 8:30 ` Peter Zijlstra
2020-04-29 10:18 ` Peter Zijlstra
2020-04-29 12:12 ` Brian Gerst
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 04/14] objtool: is_fentry_call() crashes if call has no destination Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 05/14] objtool: UNWIND_HINT_RET_OFFSET should not check registers Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 06/14] objtool: Rework allocating stack_ops on decode Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 07/14] objtool: Make handle_insn_ops() unconditional Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-05-07 12:38 ` Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 08/14] objtool: Remove INSN_STACK Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 09/14] objtool: Move the IRET hack into the arch decoder Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Miroslav Benes
2020-04-28 19:11 ` [PATCH v2 10/14] objtool: Add support for intra-function calls Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 11/14] x86/speculation: Change FILL_RETURN_BUFFER to work with objtool Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 12/14] x86: Simplify retpoline declaration Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 13/14] x86: Change {JMP,CALL}_NOSPEC argument Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 19:11 ` [PATCH v2 14/14] x86/retpoline: Fix retpoline unwind Peter Zijlstra
2020-05-01 18:22 ` [tip: objtool/core] " tip-bot2 for Peter Zijlstra
2020-04-28 20:17 ` [PATCH v2 00/14] objtool vs retpoline Josh Poimboeuf
2020-04-29 10:19 ` [PATCH v2.1 01-A/14] objtool: Remove check preventing branches within alternative Peter Zijlstra
2020-04-29 10:21 ` Peter Zijlstra [this message]
2020-04-29 16:46 ` [PATCH v2 00/14] objtool vs retpoline Miroslav Benes
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