Commit 744e9a91 authored by Kim Phillips's avatar Kim Phillips Committed by Arnaldo Carvalho de Melo

perf tools arm64: Add libdw DWARF post unwind support for ARM64

Based on prior work:

  https://lkml.org/lkml/2014/5/6/395

and on how other arches add libdw unwind support.  Includes support for
running the unwind test, e.g., on a system with only elfutils' libdw
0.170, the test now runs, and successfully:

  $ ./perf test unwind
  56: Test dwarf unwind                 : Ok
Originally-by: default avatarJean Pihet <jean.pihet@linaro.org>
Reported-by: default avatarChristian Hansen <chansen3@cisco.com>
Signed-off-by: default avatarKim Phillips <kim.phillips@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180308211030.4ee4a0d6ff6dc5cda1b567d4@arm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 03d9fcb7
...@@ -75,7 +75,7 @@ endif ...@@ -75,7 +75,7 @@ endif
# Disable it on all other architectures in case libdw unwind # Disable it on all other architectures in case libdw unwind
# support is detected in system. Add supported architectures # support is detected in system. Add supported architectures
# to the check. # to the check.
ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm powerpc s390)) ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm arm64 powerpc s390))
NO_LIBDW_DWARF_UNWIND := 1 NO_LIBDW_DWARF_UNWIND := 1
endif endif
......
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ARCH_TESTS_H
#define ARCH_TESTS_H
#ifdef HAVE_DWARF_UNWIND_SUPPORT
struct thread;
struct perf_sample;
#endif
extern struct test arch_tests[];
#endif
libperf-y += regs_load.o libperf-y += regs_load.o
libperf-y += dwarf-unwind.o libperf-y += dwarf-unwind.o
libperf-y += arch-tests.o
// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include "tests/tests.h"
#include "arch-tests.h"
struct test arch_tests[] = {
#ifdef HAVE_DWARF_UNWIND_SUPPORT
{
.desc = "DWARF unwind",
.func = test__dwarf_unwind,
},
#endif
{
.func = NULL,
},
};
...@@ -2,6 +2,7 @@ libperf-y += header.o ...@@ -2,6 +2,7 @@ libperf-y += header.o
libperf-y += sym-handling.o libperf-y += sym-handling.o
libperf-$(CONFIG_DWARF) += dwarf-regs.o libperf-$(CONFIG_DWARF) += dwarf-regs.o
libperf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o libperf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
libperf-$(CONFIG_AUXTRACE) += ../../arm/util/pmu.o \ libperf-$(CONFIG_AUXTRACE) += ../../arm/util/pmu.o \
../../arm/util/auxtrace.o \ ../../arm/util/auxtrace.o \
......
// SPDX-License-Identifier: GPL-2.0
#include <elfutils/libdwfl.h>
#include "../../util/unwind-libdw.h"
#include "../../util/perf_regs.h"
#include "../../util/event.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_ARM64_MAX], dwarf_pc;
#define REG(r) ({ \
Dwarf_Word val = 0; \
perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r); \
val; \
})
dwarf_regs[0] = REG(X0);
dwarf_regs[1] = REG(X1);
dwarf_regs[2] = REG(X2);
dwarf_regs[3] = REG(X3);
dwarf_regs[4] = REG(X4);
dwarf_regs[5] = REG(X5);
dwarf_regs[6] = REG(X6);
dwarf_regs[7] = REG(X7);
dwarf_regs[8] = REG(X8);
dwarf_regs[9] = REG(X9);
dwarf_regs[10] = REG(X10);
dwarf_regs[11] = REG(X11);
dwarf_regs[12] = REG(X12);
dwarf_regs[13] = REG(X13);
dwarf_regs[14] = REG(X14);
dwarf_regs[15] = REG(X15);
dwarf_regs[16] = REG(X16);
dwarf_regs[17] = REG(X17);
dwarf_regs[18] = REG(X18);
dwarf_regs[19] = REG(X19);
dwarf_regs[20] = REG(X20);
dwarf_regs[21] = REG(X21);
dwarf_regs[22] = REG(X22);
dwarf_regs[23] = REG(X23);
dwarf_regs[24] = REG(X24);
dwarf_regs[25] = REG(X25);
dwarf_regs[26] = REG(X26);
dwarf_regs[27] = REG(X27);
dwarf_regs[28] = REG(X28);
dwarf_regs[29] = REG(X29);
dwarf_regs[30] = REG(LR);
dwarf_regs[31] = REG(SP);
if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
dwarf_regs))
return false;
dwarf_pc = REG(PC);
dwfl_thread_state_register_pc(thread, dwarf_pc);
return true;
}
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