From: Peter Zijlstra <peterz@infradead.org>
To: x86@kernel.org, jpoimboe@redhat.com, jgross@suse.com, mbenes@suze.cz
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org
Subject: [PATCH 3/9] objtool: Per arch retpoline naming
Date: Fri, 12 Mar 2021 18:16:16 +0100 [thread overview]
Message-ID: <20210312171653.527760836@infradead.org> (raw)
In-Reply-To: 20210312171613.533405394@infradead.org
The __x86_indirect_ naming is obviously not generic. Shorten to allow
matching some additional magic names later.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
tools/objtool/arch/x86/decode.c | 5 +++++
tools/objtool/check.c | 9 +++++++--
tools/objtool/include/objtool/arch.h | 2 ++
3 files changed, 14 insertions(+), 2 deletions(-)
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -690,3 +690,8 @@ int arch_decode_hint_reg(struct instruct
return 0;
}
+
+bool arch_is_retpoline(struct symbol *sym)
+{
+ return !strncmp(sym->name, "__x86_indirect_", 15);
+}
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -850,6 +850,11 @@ static int add_ignore_alternatives(struc
return 0;
}
+__weak bool arch_is_retpoline(struct symbol *sym)
+{
+ return false;
+}
+
/*
* Find the destination instructions for all jumps.
*/
@@ -872,7 +877,7 @@ static int add_jump_destinations(struct
} else if (reloc->sym->type == STT_SECTION) {
dest_sec = reloc->sym->sec;
dest_off = arch_dest_reloc_offset(reloc->addend);
- } else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) {
+ } else if (arch_is_retpoline(reloc->sym)) {
/*
* Retpoline jumps are really dynamic jumps in
* disguise, so convert them accordingly.
@@ -1026,7 +1031,7 @@ static int add_call_destinations(struct
return -1;
}
- } else if (!strncmp(reloc->sym->name, "__x86_indirect_thunk_", 21)) {
+ } else if (arch_is_retpoline(reloc->sym)) {
/*
* Retpoline calls are really dynamic calls in
* disguise, so convert them accodingly.
--- a/tools/objtool/include/objtool/arch.h
+++ b/tools/objtool/include/objtool/arch.h
@@ -85,4 +85,6 @@ const char *arch_nop_insn(int len);
int arch_decode_hint_reg(struct instruction *insn, u8 sp_reg);
+bool arch_is_retpoline(struct symbol *sym);
+
#endif /* _ARCH_H */
next prev parent reply other threads:[~2021-03-12 17:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 17:16 [PATCH 0/9] x86,objtool: Optimize !RETPOLINE Peter Zijlstra
2021-03-12 17:16 ` [PATCH 1/9] x86/retpoline: Simplify retpolines Peter Zijlstra
2021-03-12 17:16 ` [PATCH 2/9] objtool: Correctly handle retpoline thunk calls Peter Zijlstra
2021-03-16 21:19 ` Josh Poimboeuf
2021-03-12 17:16 ` Peter Zijlstra [this message]
2021-03-12 17:16 ` [PATCH 4/9] objtool: Fix static_call list generation Peter Zijlstra
2021-03-17 3:18 ` Josh Poimboeuf
2021-03-12 17:16 ` [PATCH 5/9] objtool: Rework rebuild_reloc logic Peter Zijlstra
2021-03-17 3:34 ` Josh Poimboeuf
2021-03-17 8:12 ` Peter Zijlstra
2021-03-18 0:49 ` Josh Poimboeuf
2021-03-18 12:57 ` Peter Zijlstra
2021-03-18 16:36 ` Josh Poimboeuf
2021-03-18 17:04 ` Peter Zijlstra
2021-03-18 17:38 ` Josh Poimboeuf
2021-03-19 0:19 ` Josh Poimboeuf
2021-03-19 9:22 ` Peter Zijlstra
2021-03-19 15:15 ` Josh Poimboeuf
2021-03-12 17:16 ` [PATCH 6/9] objtool: Add elf_create_undef_symbol() Peter Zijlstra
2021-03-17 13:52 ` Miroslav Benes
2021-03-17 14:13 ` Peter Zijlstra
2021-03-17 14:39 ` Miroslav Benes
2021-03-17 15:08 ` Sami Tolvanen
2021-03-18 0:46 ` Josh Poimboeuf
2021-03-18 7:56 ` Peter Zijlstra
2021-03-12 17:16 ` [PATCH 7/9] objtool: Allow archs to rewrite retpolines Peter Zijlstra
2021-03-12 17:16 ` [PATCH 8/9] objtool: Skip magical retpoline .altinstr_replacement Peter Zijlstra
2021-03-12 17:16 ` [PATCH 9/9] objtool,x86: Rewrite retpoline thunk calls Peter Zijlstra
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