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Commit 97eac381 authored by Jean Pihet's avatar Jean Pihet Committed by Jiri Olsa
Browse files

perf tools: Add libdw DWARF post unwind support for ARM 



Adding libdw DWARF post unwind support, which is part
of elfutils-devel/libdw-dev package from version 0.158.

The new code is contained in unwin-libdw.c object, and
implements unwind__get_entries unwind interface function.

Signed-off-by: default avatarJean Pihet <jean.pihet@linaro.org>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1400229672-16104-4-git-send-email-jean.pihet@linaro.org


Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
parent 90fa9deb

tools/perf/arch/arm/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -4,6 +4,11 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o 
endif

ifndef NO_LIBUNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o

endif

ifndef NO_LIBDW_DWARF_UNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o

endif

ifndef NO_DWARF_UNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o

endif

tools/perf/arch/arm/util/unwind-libdw.c

0 → 100644
+36 −0
Original line number Diff line number Diff line 
#include <elfutils/libdwfl.h>

#include "../../util/unwind-libdw.h"

#include "../../util/perf_regs.h"



bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)

{

	struct unwind_info *ui = arg;

	struct regs_dump *user_regs = &ui->sample->user_regs;

	Dwarf_Word dwarf_regs[PERF_REG_ARM_MAX];



#define REG(r) ({						\

	Dwarf_Word val = 0;					\

	perf_reg_value(&val, user_regs, PERF_REG_ARM_##r);	\

	val;							\

})



	dwarf_regs[0]  = REG(R0);

	dwarf_regs[1]  = REG(R1);

	dwarf_regs[2]  = REG(R2);

	dwarf_regs[3]  = REG(R3);

	dwarf_regs[4]  = REG(R4);

	dwarf_regs[5]  = REG(R5);

	dwarf_regs[6]  = REG(R6);

	dwarf_regs[7]  = REG(R7);

	dwarf_regs[8]  = REG(R8);

	dwarf_regs[9]  = REG(R9);

	dwarf_regs[10] = REG(R10);

	dwarf_regs[11] = REG(FP);

	dwarf_regs[12] = REG(IP);

	dwarf_regs[13] = REG(SP);

	dwarf_regs[14] = REG(LR);

	dwarf_regs[15] = REG(PC);



	return dwfl_thread_state_registers(thread, 0, PERF_REG_ARM_MAX,

					   dwarf_regs);

}