Commit a7f0fda0 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Arnaldo Carvalho de Melo
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perf unwind: Support for powerpc 



Porting PPC to libdw only needs an architecture-specific hook to move
the register state from perf to libdw.

The ARM and x86 architectures already use libdw, and it is useful to
have as much common code for the unwinder as possible.  Mark Wielaard
has contributed a frame-based unwinder to libdw, so that unwinding works
even for binaries that do not have CFI information.  In addition,
libunwind is always preferred to libdw by the build machinery so this
cannot introduce regressions on machines that have both libunwind and
libdw installed.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Acked-by: default avatarMilian Wolff <milian.wolff@kdab.com>
Acked-by: default avatarRavi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1496312681-20133-1-git-send-email-pbonzini@redhat.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent daefd0bc

tools/perf/Makefile.config

+1 −1
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ endif 
# Disable it on all other architectures in case libdw unwind

# support is detected in system. Add supported architectures

# to the check.

ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm))

ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm powerpc))

  NO_LIBDW_DWARF_UNWIND := 1

endif

tools/perf/arch/powerpc/util/Build

+2 −0
Original line number Diff line number Diff line
@@ -5,4 +5,6 @@ libperf-y += perf_regs.o 


libperf-$(CONFIG_DWARF) += dwarf-regs.o

libperf-$(CONFIG_DWARF) += skip-callchain-idx.o



libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind.o

libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

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

0 → 100644
+73 −0
Original line number Diff line number Diff line 
#include <elfutils/libdwfl.h>

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

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

#include "../../util/event.h"



/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils.  */

static const int special_regs[3][2] = {

	{ 65, PERF_REG_POWERPC_LINK },

	{ 101, PERF_REG_POWERPC_XER },

	{ 109, PERF_REG_POWERPC_CTR },

};



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[32], dwarf_nip;

	size_t i;



#define REG(r) ({						\

	Dwarf_Word val = 0;					\

	perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##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(R11);

	dwarf_regs[12] = REG(R12);

	dwarf_regs[13] = REG(R13);

	dwarf_regs[14] = REG(R14);

	dwarf_regs[15] = REG(R15);

	dwarf_regs[16] = REG(R16);

	dwarf_regs[17] = REG(R17);

	dwarf_regs[18] = REG(R18);

	dwarf_regs[19] = REG(R19);

	dwarf_regs[20] = REG(R20);

	dwarf_regs[21] = REG(R21);

	dwarf_regs[22] = REG(R22);

	dwarf_regs[23] = REG(R23);

	dwarf_regs[24] = REG(R24);

	dwarf_regs[25] = REG(R25);

	dwarf_regs[26] = REG(R26);

	dwarf_regs[27] = REG(R27);

	dwarf_regs[28] = REG(R28);

	dwarf_regs[29] = REG(R29);

	dwarf_regs[30] = REG(R30);

	dwarf_regs[31] = REG(R31);

	if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))

		return false;



	dwarf_nip = REG(NIP);

	dwfl_thread_state_register_pc(thread, dwarf_nip);

	for (i = 0; i < ARRAY_SIZE(special_regs); i++) {

		Dwarf_Word val = 0;

		perf_reg_value(&val, user_regs, special_regs[i][1]);

		if (!dwfl_thread_state_registers(thread,

						 special_regs[i][0], 1,

						 &val))

			return false;

	}



	return true;

}

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