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

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>

diff --git a/tools/perf/arch/arm64/Build b/tools/perf/arch/arm64/Build
index 54afe4a..41bf61d 100644 (file)
--- a/tools/perf/arch/arm64/Build
+++ b/tools/perf/arch/arm64/Build
@@ -1 +1,2 @@
 libperf-y += util/
+libperf-$(CONFIG_DWARF_UNWIND) += tests/

diff --git a/tools/perf/arch/arm64/include/perf_regs.h b/tools/perf/arch/arm64/include/perf_regs.h
index 1d3f39c..4e5af27 100644 (file)
--- a/tools/perf/arch/arm64/include/perf_regs.h
+++ b/tools/perf/arch/arm64/include/perf_regs.h
@@ -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

diff --git a/tools/perf/arch/arm64/tests/Build b/tools/perf/arch/arm64/tests/Build
new file mode 100644 (file)
index 0000000..b30eff9
--- /dev/null
+++ b/tools/perf/arch/arm64/tests/Build
@@ -0,0 +1,2 @@
+libperf-y += regs_load.o
+libperf-y += dwarf-unwind.o

diff --git a/tools/perf/arch/arm64/tests/dwarf-unwind.c b/tools/perf/arch/arm64/tests/dwarf-unwind.c
new file mode 100644 (file)
index 0000000..cf04a4c
--- /dev/null
+++ b/tools/perf/arch/arm64/tests/dwarf-unwind.c
@@ -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);
+}

diff --git a/tools/perf/arch/arm64/tests/regs_load.S b/tools/perf/arch/arm64/tests/regs_load.S
new file mode 100644 (file)
index 0000000..025b46e
--- /dev/null
+++ b/tools/perf/arch/arm64/tests/regs_load.S
@@ -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)

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 6a8801b..67f48e6 100644 (file)
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -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
 

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index f42af98..b5b87a2 100644 (file)
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -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",

diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index a10eaf5..87bcaf1 100644 (file)
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -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;