Commit 6a40cd90 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add libunwind dependency for DWARF CFI unwinding 



Adding libunwind to be linked with perf if available. It's required
for the to get dwarf cfi unwinding support.

Also building perf with the dwarf call frame informations by default,
so that we can unwind callchains in perf itself.

Adding LIBUNWIND_DIR Makefile variable allowing user to specify
the directory with libunwind to be linked. This is used for
debug purposes.

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Original-patch-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1344345647-11536-10-git-send-email-jolsa@redhat.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 2bcd355b

tools/perf/Makefile

+28 −1
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ include config/utilities.mak 
#

# Define NO_LIBELF if you do not want libelf dependency (e.g. cross-builds)

#

# Define NO_LIBUNWIND if you do not want libunwind dependency for dwarf

# backtrace post unwind.



$(OUTPUT)PERF-VERSION-FILE: .FORCE-PERF-VERSION-FILE

	@$(SHELL_PATH) util/PERF-VERSION-GEN $(OUTPUT)
@@ -64,6 +66,7 @@ AR = $(CROSS_COMPILE)ar 
ifeq ($(ARCH),i386)

	ARCH := x86

	NO_PERF_REGS := 0

	LIBUNWIND_LIBS = -lunwind -lunwind-x86

endif

ifeq ($(ARCH),x86_64)

	ARCH := x86
@@ -77,6 +80,7 @@ ifeq ($(ARCH),x86_64) 
		ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S

	endif

	NO_PERF_REGS := 0

	LIBUNWIND_LIBS = -lunwind -lunwind-x86_64

endif



# Treat warnings as errors unless directed not to
@@ -97,7 +101,7 @@ ifdef PARSER_DEBUG 
	PARSER_DEBUG_CFLAGS := -DPARSER_DEBUG

endif



CFLAGS = -fno-omit-frame-pointer -ggdb3 -Wall -Wextra -std=gnu99 $(CFLAGS_WERROR) $(CFLAGS_OPTIMIZE) $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) $(PARSER_DEBUG_CFLAGS)

CFLAGS = -fno-omit-frame-pointer -ggdb3 -funwind-tables -Wall -Wextra -std=gnu99 $(CFLAGS_WERROR) $(CFLAGS_OPTIMIZE) $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) $(PARSER_DEBUG_CFLAGS)

EXTLIBS = -lpthread -lrt -lelf -lm

ALL_CFLAGS = $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE

ALL_LDFLAGS = $(LDFLAGS)
@@ -476,6 +480,21 @@ ifneq ($(call try-cc,$(SOURCE_LIBELF),$(FLAGS_LIBELF)),y) 
endif

endif # NO_LIBELF



ifndef NO_LIBUNWIND

# for linking with debug library, run like:

# make DEBUG=1 LIBUNWIND_DIR=/opt/libunwind/

ifdef LIBUNWIND_DIR

	LIBUNWIND_CFLAGS  := -I$(LIBUNWIND_DIR)/include

	LIBUNWIND_LDFLAGS := -L$(LIBUNWIND_DIR)/lib

endif



FLAGS_UNWIND=$(LIBUNWIND_CFLAGS) $(ALL_CFLAGS) $(LIBUNWIND_LDFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) $(LIBUNWIND_LIBS)

ifneq ($(call try-cc,$(SOURCE_LIBUNWIND),$(FLAGS_UNWIND)),y)

	msg := $(warning No libunwind found. Please install libunwind >= 0.99);

	NO_LIBUNWIND := 1

endif # Libunwind support

endif # NO_LIBUNWIND



-include arch/$(ARCH)/Makefile



ifneq ($(OUTPUT),)
@@ -522,6 +541,14 @@ endif # PERF_HAVE_DWARF_REGS 
endif # NO_DWARF

endif # NO_LIBELF



ifdef NO_LIBUNWIND

	BASIC_CFLAGS += -DNO_LIBUNWIND_SUPPORT

else

	EXTLIBS += $(LIBUNWIND_LIBS)

	BASIC_CFLAGS := $(LIBUNWIND_CFLAGS) $(BASIC_CFLAGS)

	BASIC_LDFLAGS := $(LIBUNWIND_LDFLAGS) $(BASIC_LDFLAGS)

endif



ifdef NO_NEWT

	BASIC_CFLAGS += -DNO_NEWT_SUPPORT

else

tools/perf/config/feature-tests.mak

+25 −0
Original line number Diff line number Diff line
@@ -154,3 +154,28 @@ int main(void) 
	return 0;

}

endef



ifndef NO_LIBUNWIND

define SOURCE_LIBUNWIND

#include <libunwind.h>

#include <stdlib.h>



extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,

                                      unw_word_t ip,

                                      unw_dyn_info_t *di,

                                      unw_proc_info_t *pi,

                                      int need_unwind_info, void *arg);





#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)



int main(void)

{

	unw_addr_space_t addr_space;

	addr_space = unw_create_addr_space(NULL, 0);

	unw_init_remote(NULL, addr_space, NULL);

	dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);

	return 0;

}

endef

endif

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