| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <176398104154.498.14035591969424868341.tip-bot2@tip-bot2>
Date: Mon, 24 Nov 2025 10:44:01 -0000
From: "tip-bot2 for Alexandre Chartre" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Alexandre Chartre <alexandre.chartre@...cle.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject:
[tip: objtool/core] objtool: Function to get the name of a CPU feature
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: afff4e5820e9a0d609740a83c366f3f0335db342
Gitweb: https://git.kernel.org/tip/afff4e5820e9a0d609740a83c366f3f0335db342
Author: Alexandre Chartre <alexandre.chartre@...cle.com>
AuthorDate: Fri, 21 Nov 2025 10:53:36 +01:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 24 Nov 2025 11:35:06 +01:00
objtool: Function to get the name of a CPU feature
Add a function to get the name of a CPU feature. The function is
architecture dependent and currently only implemented for x86. The
feature names are automatically generated from the cpufeatures.h
include file.
Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>
Link: https://patch.msgid.link/20251121095340.464045-27-alexandre.chartre@oracle.com
---
tools/arch/x86/tools/gen-cpu-feature-names-x86.awk | 33 +++++++++++++-
tools/objtool/.gitignore | 1 +-
tools/objtool/Makefile | 1 +-
tools/objtool/arch/loongarch/special.c | 5 ++-
tools/objtool/arch/powerpc/special.c | 5 ++-
tools/objtool/arch/x86/Build | 13 ++++-
tools/objtool/arch/x86/special.c | 10 ++++-
tools/objtool/include/objtool/special.h | 2 +-
8 files changed, 69 insertions(+), 1 deletion(-)
create mode 100644 tools/arch/x86/tools/gen-cpu-feature-names-x86.awk
diff --git a/tools/arch/x86/tools/gen-cpu-feature-names-x86.awk b/tools/arch/x86/tools/gen-cpu-feature-names-x86.awk
new file mode 100644
index 0000000..1b1c1d8
--- /dev/null
+++ b/tools/arch/x86/tools/gen-cpu-feature-names-x86.awk
@@ -0,0 +1,33 @@
+#!/bin/awk -f
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2025, Oracle and/or its affiliates.
+#
+# Usage: awk -f gen-cpu-feature-names-x86.awk cpufeatures.h > cpu-feature-names.c
+#
+
+BEGIN {
+ print "/* cpu feature name array generated from cpufeatures.h */"
+ print "/* Do not change this code. */"
+ print
+ print "static const char *cpu_feature_names[(NCAPINTS+NBUGINTS)*32] = {"
+
+ feature_expr = "(X86_FEATURE_[A-Z0-9_]+)\\s+\\(([0-9*+ ]+)\\)"
+ debug_expr = "(X86_BUG_[A-Z0-9_]+)\\s+X86_BUG\\(([0-9*+ ]+)\\)"
+}
+
+/^#define X86_FEATURE_/ {
+ if (match($0, feature_expr, m)) {
+ print "\t[" m[2] "] = \"" m[1] "\","
+ }
+}
+
+/^#define X86_BUG_/ {
+ if (match($0, debug_expr, m)) {
+ print "\t[NCAPINTS*32+(" m[2] ")] = \"" m[1] "\","
+ }
+}
+
+END {
+ print "};"
+}
diff --git a/tools/objtool/.gitignore b/tools/objtool/.gitignore
index 7593036..73d8831 100644
--- a/tools/objtool/.gitignore
+++ b/tools/objtool/.gitignore
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
+arch/x86/lib/cpu-feature-names.c
arch/x86/lib/inat-tables.c
/objtool
feature
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index df793ca..66397d7 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -125,6 +125,7 @@ $(LIBSUBCMD)-clean:
clean: $(LIBSUBCMD)-clean
$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
+ $(Q)$(RM) $(OUTPUT)arch/x86/lib/cpu-feature-names.c $(OUTPUT)fixdep
$(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep
$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.objtool
$(Q)$(RM) -r -- $(OUTPUT)feature
diff --git a/tools/objtool/arch/loongarch/special.c b/tools/objtool/arch/loongarch/special.c
index a80b75f..aba7741 100644
--- a/tools/objtool/arch/loongarch/special.c
+++ b/tools/objtool/arch/loongarch/special.c
@@ -194,3 +194,8 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
return rodata_reloc;
}
+
+const char *arch_cpu_feature_name(int feature_number)
+{
+ return NULL;
+}
diff --git a/tools/objtool/arch/powerpc/special.c b/tools/objtool/arch/powerpc/special.c
index 5161068..8f9bf61 100644
--- a/tools/objtool/arch/powerpc/special.c
+++ b/tools/objtool/arch/powerpc/special.c
@@ -18,3 +18,8 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
{
exit(-1);
}
+
+const char *arch_cpu_feature_name(int feature_number)
+{
+ return NULL;
+}
diff --git a/tools/objtool/arch/x86/Build b/tools/objtool/arch/x86/Build
index 3dedb2f..febee0b 100644
--- a/tools/objtool/arch/x86/Build
+++ b/tools/objtool/arch/x86/Build
@@ -1,5 +1,5 @@
-objtool-y += special.o
objtool-y += decode.o
+objtool-y += special.o
objtool-y += orc.o
inat_tables_script = ../arch/x86/tools/gen-insn-attr-x86.awk
@@ -12,3 +12,14 @@ $(OUTPUT)arch/x86/lib/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
$(OUTPUT)arch/x86/decode.o: $(OUTPUT)arch/x86/lib/inat-tables.c
CFLAGS_decode.o += -I$(OUTPUT)arch/x86/lib
+
+cpu_features = ../arch/x86/include/asm/cpufeatures.h
+cpu_features_script = ../arch/x86/tools/gen-cpu-feature-names-x86.awk
+
+$(OUTPUT)arch/x86/lib/cpu-feature-names.c: $(cpu_features_script) $(cpu_features)
+ $(call rule_mkdir)
+ $(Q)$(call echo-cmd,gen)$(AWK) -f $(cpu_features_script) $(cpu_features) > $@
+
+$(OUTPUT)arch/x86/special.o: $(OUTPUT)arch/x86/lib/cpu-feature-names.c
+
+CFLAGS_special.o += -I$(OUTPUT)arch/x86/lib
diff --git a/tools/objtool/arch/x86/special.c b/tools/objtool/arch/x86/special.c
index 0930076..e817a3f 100644
--- a/tools/objtool/arch/x86/special.c
+++ b/tools/objtool/arch/x86/special.c
@@ -4,6 +4,10 @@
#include <objtool/special.h>
#include <objtool/builtin.h>
#include <objtool/warn.h>
+#include <asm/cpufeatures.h>
+
+/* cpu feature name array generated from cpufeatures.h */
+#include "cpu-feature-names.c"
void arch_handle_alternative(struct special_alt *alt)
{
@@ -134,3 +138,9 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
*table_size = 0;
return rodata_reloc;
}
+
+const char *arch_cpu_feature_name(int feature_number)
+{
+ return (feature_number < ARRAY_SIZE(cpu_feature_names)) ?
+ cpu_feature_names[feature_number] : NULL;
+}
diff --git a/tools/objtool/include/objtool/special.h b/tools/objtool/include/objtool/special.h
index b224107..121c376 100644
--- a/tools/objtool/include/objtool/special.h
+++ b/tools/objtool/include/objtool/special.h
@@ -38,4 +38,6 @@ bool arch_support_alt_relocation(struct special_alt *special_alt,
struct reloc *arch_find_switch_table(struct objtool_file *file,
struct instruction *insn,
unsigned long *table_size);
+const char *arch_cpu_feature_name(int feature_number);
+
#endif /* _SPECIAL_H */
Powered by blists - more mailing lists