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Subject[PATCH v6 10/11] perf callchain: Support x86 target platform
Date
Support x86(32-bit) cross platform callchain unwind.

Signed-off-by: He Kuang <hekuang@huawei.com>
---
tools/perf/arch/Build | 1 +
tools/perf/arch/x86/util/unwind-libunwind.c | 7 ++++---
tools/perf/arch/x86/util/unwind-libunwind_x86_32.c | 21 +++++++++++++++++++++
tools/perf/util/unwind-libunwind-local.c | 4 ++++
tools/perf/util/unwind-libunwind.c | 19 +++++++++++++------
tools/perf/util/unwind.h | 10 ++++++++++
6 files changed, 53 insertions(+), 9 deletions(-)
create mode 100644 tools/perf/arch/x86/util/unwind-libunwind_x86_32.c

diff --git a/tools/perf/arch/Build b/tools/perf/arch/Build
index 109eb75..3fc4af1 100644
--- a/tools/perf/arch/Build
+++ b/tools/perf/arch/Build
@@ -1,2 +1,3 @@
libperf-y += common.o
libperf-y += $(ARCH)/
+libperf-$(CONFIG_LIBUNWIND_X86) += x86/util/unwind-libunwind_x86_32.o
diff --git a/tools/perf/arch/x86/util/unwind-libunwind.c b/tools/perf/arch/x86/util/unwind-libunwind.c
index db25e93..3b0be69 100644
--- a/tools/perf/arch/x86/util/unwind-libunwind.c
+++ b/tools/perf/arch/x86/util/unwind-libunwind.c
@@ -1,12 +1,13 @@
-
+#ifndef REMOTE_UNWIND_LIBUNWIND
#include <errno.h>
#include <libunwind.h>
#include "perf_regs.h"
#include "../../util/unwind.h"
#include "../../util/debug.h"
+#endif

#ifdef HAVE_ARCH_X86_64_SUPPORT
-int libunwind__arch_reg_id(int regnum)
+int LIBUNWIND__ARCH_REG_ID(int regnum)
{
int id;

@@ -70,7 +71,7 @@ int libunwind__arch_reg_id(int regnum)
return id;
}
#else
-int libunwind__arch_reg_id(int regnum)
+int LIBUNWIND__ARCH_REG_ID(int regnum)
{
int id;

diff --git a/tools/perf/arch/x86/util/unwind-libunwind_x86_32.c b/tools/perf/arch/x86/util/unwind-libunwind_x86_32.c
new file mode 100644
index 0000000..9d5359e
--- /dev/null
+++ b/tools/perf/arch/x86/util/unwind-libunwind_x86_32.c
@@ -0,0 +1,21 @@
+#define REMOTE_UNWIND_LIBUNWIND
+
+#define LIBUNWIND__ARCH_REG_ID libunwind__x86_reg_id
+
+#include "unwind.h"
+#include "debug.h"
+#include "libunwind-x86.h"
+#include <../../../../../arch/x86/include/uapi/asm/perf_regs.h>
+
+#undef HAVE_ARCH_X86_64_SUPPORT
+#include "unwind-libunwind.c"
+
+#undef NO_LIBUNWIND_DEBUG_FRAME
+#define NO_LIBUNWIND_DEBUG_FRAME
+#include "util/unwind-libunwind-local.c"
+
+int register_x86_32_unwind_libunwind_ops(struct thread *thread)
+{
+ thread->unwind_libunwind_ops = &_unwind_libunwind_ops;
+ return 0;
+}
diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
index b391e3e..849fec1 100644
--- a/tools/perf/util/unwind-libunwind-local.c
+++ b/tools/perf/util/unwind-libunwind-local.c
@@ -5,7 +5,9 @@
#include <unistd.h>
#include <sys/mman.h>
#include <linux/list.h>
+#ifndef REMOTE_UNWIND_LIBUNWIND
#include <libunwind.h>
+#endif
#include "callchain.h"
#include "thread.h"
#include "session.h"
@@ -671,7 +673,9 @@ _unwind_libunwind_ops = {
.get_entries = _unwind__get_entries,
};

+#ifndef REMOTE_UNWIND_LIBUNWIND
void register_local_unwind_libunwind_ops(struct thread *thread)
{
thread->unwind_libunwind_ops = &_unwind_libunwind_ops;
}
+#endif
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 037ee72..c1d9d36 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -8,6 +8,9 @@ int unwind__prepare_access(struct thread *thread, struct map *map)
{
const char *arch;
enum dso_type dso_type;
+ int use_local_unwind = 1;
+ int ret;
+ int (*register_func)(struct thread *thread) = NULL;

if (!thread->mg->machine->env)
return -1;
@@ -22,16 +25,20 @@ int unwind__prepare_access(struct thread *thread, struct map *map)

arch = normalize_arch(thread->mg->machine->env->arch);

- if (!strcmp(arch, "x86")) {
+ if (!strcmp(arch, "x86"))
if (dso_type != DSO__TYPE_64BIT)
-#ifdef HAVE_LIBUNWIND_X86_SUPPORT
- pr_err("unwind: target platform=%s is not implemented\n", arch);
-#else
+ register_func = register_x86_32_unwind_libunwind_ops;
+
+ if (register_func) {
+ ret = register_func(thread);
+ if (!ret)
+ use_local_unwind = 0;
+ else
pr_err("unwind: target platform=%s is not supported\n", arch);
-#endif
}

- register_local_unwind_libunwind_ops(thread);
+ if (use_local_unwind)
+ register_local_unwind_libunwind_ops(thread);

return thread->unwind_libunwind_ops->prepare_access(thread);
}
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index 9e4f545..43f9f66 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -46,6 +46,16 @@ static inline void
register_local_unwind_libunwind_ops(struct thread *thread __maybe_unused) {}
#endif

+#ifdef HAVE_LIBUNWIND_X86_SUPPORT
+int register_x86_32_unwind_libunwind_ops(struct thread *thread);
+#else
+static inline int
+register_x86_32_unwind_libunwind_ops(struct thread *thread __maybe_unused)
+{
+ return -1;
+}
+#endif
+
#else
static inline int
unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
--
1.8.5.2
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