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perf tools: Add ARM64 perf_regs_load to support libunwind and enable testing

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Newest libunwind does support ARM64, and perf is able to utilize it
also.

This patch enables the perf test dwarf unwind for arm64.

 Test result:
  # ./perf test unwind
  25: Test dwarf unwind                                      : Ok

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1427461681-72971-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-03-27 13:08:01 +00:00 committed by Arnaldo Carvalho de Melo
parent b236512280
commit 3237f28188
8 changed files with 116 additions and 3 deletions
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1
tools/perf/arch/arm64/Build
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@ -1 +1,2 @@
libperf-y += util/
libperf-$(CONFIG_DWARF_UNWIND) += tests/

3
tools/perf/arch/arm64/include/perf_regs.h
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@ -5,8 +5,11 @@
#include <linux/types.h>
#include <asm/perf_regs.h>
void perf_regs_load(u64 *regs);
#define PERF_REGS_MASK ((1ULL << PERF_REG_ARM64_MAX) - 1)
#define PERF_REGS_MAX PERF_REG_ARM64_MAX
#define PERF_SAMPLE_REGS_ABI PERF_SAMPLE_REGS_ABI_64
#define PERF_REG_IP PERF_REG_ARM64_PC
#define PERF_REG_SP PERF_REG_ARM64_SP

2
tools/perf/arch/arm64/tests/Build Normal file
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@ -0,0 +1,2 @@
libperf-y += regs_load.o
libperf-y += dwarf-unwind.o

61
tools/perf/arch/arm64/tests/dwarf-unwind.c Normal file
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@ -0,0 +1,61 @@
#include <string.h>
#include "perf_regs.h"
#include "thread.h"
#include "map.h"
#include "event.h"
#include "debug.h"
#include "tests/tests.h"
#define STACK_SIZE 8192
static int sample_ustack(struct perf_sample *sample,
struct thread *thread, u64 *regs)
{
struct stack_dump *stack = &sample->user_stack;
struct map *map;
unsigned long sp;
u64 stack_size, *buf;
buf = malloc(STACK_SIZE);
if (!buf) {
pr_debug("failed to allocate sample uregs data\n");
return -1;
}
sp = (unsigned long) regs[PERF_REG_ARM64_SP];
map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);
if (!map) {
pr_debug("failed to get stack map\n");
free(buf);
return -1;
}
stack_size = map->end - sp;
stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
memcpy(buf, (void *) sp, stack_size);
stack->data = (char *) buf;
stack->size = stack_size;
return 0;
}
int test__arch_unwind_sample(struct perf_sample *sample,
struct thread *thread)
{
struct regs_dump *regs = &sample->user_regs;
u64 *buf;
buf = calloc(1, sizeof(u64) * PERF_REGS_MAX);
if (!buf) {
pr_debug("failed to allocate sample uregs data\n");
return -1;
}
perf_regs_load(buf);
regs->abi = PERF_SAMPLE_REGS_ABI;
regs->regs = buf;
regs->mask = PERF_REGS_MASK;
return sample_ustack(sample, thread, buf);
}

46
tools/perf/arch/arm64/tests/regs_load.S Normal file
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@ -0,0 +1,46 @@
#include <linux/linkage.h>
.text
.type perf_regs_load,%function
#define STR_REG(r) str x##r, [x0, 8 * r]
#define LDR_REG(r) ldr x##r, [x0, 8 * r]
#define SP (8 * 31)
#define PC (8 * 32)
ENTRY(perf_regs_load)
STR_REG(0)
STR_REG(1)
STR_REG(2)
STR_REG(3)
STR_REG(4)
STR_REG(5)
STR_REG(6)
STR_REG(7)
STR_REG(8)
STR_REG(9)
STR_REG(10)
STR_REG(11)
STR_REG(12)
STR_REG(13)
STR_REG(14)
STR_REG(15)
STR_REG(16)
STR_REG(17)
STR_REG(18)
STR_REG(19)
STR_REG(20)
STR_REG(21)
STR_REG(22)
STR_REG(23)
STR_REG(24)
STR_REG(25)
STR_REG(26)
STR_REG(27)
STR_REG(28)
STR_REG(29)
STR_REG(30)
mov x1, sp
str x1, [x0, #SP]
str x30, [x0, #PC]
LDR_REG(1)
ret
ENDPROC(perf_regs_load)

2
tools/perf/tests/Build
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@ -34,7 +34,7 @@ perf-y += kmod-path.o
perf-$(CONFIG_X86) += perf-time-to-tsc.o
ifeq ($(ARCH),$(filter $(ARCH),x86 arm))
ifeq ($(ARCH),$(filter $(ARCH),x86 arm arm64))
perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
endif

2
tools/perf/tests/builtin-test.c
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@ -126,7 +126,7 @@ static struct test {
.desc = "Test parsing with no sample_id_all bit set",
.func = test__parse_no_sample_id_all,
},
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
{
.desc = "Test dwarf unwind",

2
tools/perf/tests/tests.h
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@ -62,7 +62,7 @@ int test__fdarray__filter(void);
int test__fdarray__add(void);
int test__kmod_path__parse(void);
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
struct thread;
struct perf_sample;