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Message-ID: <d6dc160104731b30b364d9f9fb78261736f44d4e.1586468801.git.mhelsley@vmware.com>
Date: Fri, 10 Apr 2020 12:35:29 -0700
From: Matt Helsley <mhelsley@...are.com>
To: <linux-kernel@...r.kernel.org>
CC: Josh Poimboeuf <jpoimboe@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Julien Thierry <jthierry@...hat.com>,
Ingo Molnar <mingo@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Miroslav Benes <mbenes@...e.cz>,
Matt Helsley <mhelsley@...are.com>
Subject: [RFC][PATCH 06/36] objtool: Prepare to merge recordmcount
Move recordmcount into the objtool directory. We keep this step separate
so changes which turn recordmcount into a subcommand of objtool don't
get obscured.
Signed-off-by: Matt Helsley <mhelsley@...are.com>
---
Documentation/trace/ftrace-design.rst | 4 ++--
Documentation/trace/ftrace.rst | 2 +-
scripts/.gitignore | 1 -
scripts/Makefile | 1 -
scripts/Makefile.build | 11 ++++++-----
tools/objtool/.gitignore | 1 +
tools/objtool/Build | 2 ++
tools/objtool/Makefile | 13 ++++++++++++-
{scripts => tools/objtool}/recordmcount.c | 0
{scripts => tools/objtool}/recordmcount.h | 0
{scripts => tools/objtool}/recordmcount.pl | 0
11 files changed, 24 insertions(+), 11 deletions(-)
rename {scripts => tools/objtool}/recordmcount.c (100%)
rename {scripts => tools/objtool}/recordmcount.h (100%)
rename {scripts => tools/objtool}/recordmcount.pl (100%)
diff --git a/Documentation/trace/ftrace-design.rst b/Documentation/trace/ftrace-design.rst
index a8e22e0db63c..dea8db5e79d0 100644
--- a/Documentation/trace/ftrace-design.rst
+++ b/Documentation/trace/ftrace-design.rst
@@ -261,7 +261,7 @@ You need very few things to get the syscalls tracing in an arch.
HAVE_FTRACE_MCOUNT_RECORD
-------------------------
-See scripts/recordmcount.pl for more info. Just fill in the arch-specific
+See tools/objtool/recordmcount.pl for more info. Just fill in the arch-specific
details for how to locate the addresses of mcount call sites via objdump.
This option doesn't make much sense without also implementing dynamic ftrace.
@@ -379,7 +379,7 @@ linux/ftrace.h for the functions::
ftrace_make_call()
The rec->ip value is the address of the mcount call site that was collected
-by the scripts/recordmcount.pl during build time.
+by the tools/objtool/recordmcount.pl during build time.
The last function is used to do runtime patching of the active tracer. This
will be modifying the assembly code at the location of the ftrace_call symbol
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 3b5614b1d1a5..9adefcc3c7a8 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -2685,7 +2685,7 @@ starts of pointing to a simple return. (Enabling FTRACE will
include the -pg switch in the compiling of the kernel.)
At compile time every C file object is run through the
-recordmcount program (located in the scripts directory). This
+recordmcount program (located in the tools/objtool directory). This
program will parse the ELF headers in the C object to find all
the locations in the .text section that call mcount. Starting
with gcc version 4.6, the -mfentry has been added for x86, which
diff --git a/scripts/.gitignore b/scripts/.gitignore
index 0d1c8e217cd7..dafda6d2c306 100644
--- a/scripts/.gitignore
+++ b/scripts/.gitignore
@@ -2,7 +2,6 @@
bin2c
kallsyms
unifdef
-recordmcount
sorttable
asn1_compiler
extract-cert
diff --git a/scripts/Makefile b/scripts/Makefile
index 5e75802b1a44..f0f869364e5a 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -9,7 +9,6 @@ HOST_EXTRACFLAGS += -I$(srctree)/tools/include
always-$(CONFIG_BUILD_BIN2C) += bin2c
always-$(CONFIG_KALLSYMS) += kallsyms
-always-$(BUILD_C_RECORDMCOUNT) += recordmcount
always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable
always-$(CONFIG_ASN1) += asn1_compiler
always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a1730d42e5f3..5bc668dbfb61 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -175,18 +175,19 @@ endif
# files, including recordmcount.
sub_cmd_record_mcount = \
if [ $(@) != "scripts/mod/empty.o" ]; then \
- $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
+ $(objtree)/tools/objtool/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
fi;
-recordmcount_source := $(srctree)/scripts/recordmcount.c \
- $(srctree)/scripts/recordmcount.h
+
+recordmcount_source := $(srctree)/tools/objtool/recordmcount.c \
+ $(srctree)/tools/objtool/recordmcount.h
else
-sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
+sub_cmd_record_mcount = perl $(srctree)/tools/objtool/recordmcount.pl "$(ARCH)" \
"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
"$(if $(CONFIG_64BIT),64,32)" \
"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
"$(if $(part-of-module),1,0)" "$(@)";
-recordmcount_source := $(srctree)/scripts/recordmcount.pl
+recordmcount_source := $(srctree)/tools/objtool/recordmcount.pl
endif # BUILD_C_RECORDMCOUNT
cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
$(sub_cmd_record_mcount))
diff --git a/tools/objtool/.gitignore b/tools/objtool/.gitignore
index 45cefda24c7b..ea441abcd1d3 100644
--- a/tools/objtool/.gitignore
+++ b/tools/objtool/.gitignore
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
arch/x86/lib/inat-tables.c
objtool
+recordmcount
fixdep
diff --git a/tools/objtool/Build b/tools/objtool/Build
index e372cddd86e0..35385b1bf313 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -27,3 +27,5 @@ $(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
$(OUTPUT)librbtree.o: ../lib/rbtree.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
+
+recordmcount-y += recordmcount.o
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index ee08aeff30a1..e9cbf8728e67 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -25,6 +25,12 @@ OBJTOOL_IN := $(OBJTOOL)-in.o
LIBELF_FLAGS := $(shell pkg-config libelf --cflags 2>/dev/null)
LIBELF_LIBS := $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
+RECORDMCOUNT := $(OUTPUT)recordmcount
+RECORDMCOUNT_IN := $(RECORDMCOUNT)-in.o
+ifeq ($(BUILD_C_RECORDMCOUNT),y)
+all: $(RECORDMCOUNT)
+endif
+
all: $(OBJTOOL)
INCLUDES := -I$(srctree)/tools/include \
@@ -45,16 +51,21 @@ include $(srctree)/tools/build/Makefile.include
$(OBJTOOL_IN): fixdep FORCE
@$(MAKE) $(build)=objtool
+$(RECORDMCOUNT_IN): fixdep FORCE
+ @$(MAKE) $(build)=recordmcount
+
$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
@$(CONFIG_SHELL) ./sync-check.sh
$(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@
+$(RECORDMCOUNT): $(RECORDMCOUNT_IN)
+ $(QUIET_LINK)$(CC) $(RECORDMCOUNT_IN) $(KBUILD_HOSTLDFLAGS) -o $@
$(LIBSUBCMD): fixdep FORCE
$(Q)$(MAKE) -C $(SUBCMD_SRCDIR) OUTPUT=$(LIBSUBCMD_OUTPUT)
clean:
- $(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
+ $(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL) $(RECORDMCOUNT)
$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
$(Q)$(RM) $(OUTPUT)arch/x86/inat-tables.c $(OUTPUT)fixdep
diff --git a/scripts/recordmcount.c b/tools/objtool/recordmcount.c
similarity index 100%
rename from scripts/recordmcount.c
rename to tools/objtool/recordmcount.c
diff --git a/scripts/recordmcount.h b/tools/objtool/recordmcount.h
similarity index 100%
rename from scripts/recordmcount.h
rename to tools/objtool/recordmcount.h
diff --git a/scripts/recordmcount.pl b/tools/objtool/recordmcount.pl
similarity index 100%
rename from scripts/recordmcount.pl
rename to tools/objtool/recordmcount.pl
--
2.20.1
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