Support x86(32-bit) cross platform callchain unwind.
Signed-off-by: He Kuang <heku...@huawei.com>
---
.../arch/x86/include/libunwind/libunwind-arch.h | 18 ++++++++++
tools/perf/arch/x86/util/unwind-libunwind.c | 42 ++++++++++++++++++++++
tools/perf/util/Build | 6 ++++
tools/perf/util/unwind-libunwind.c | 2 +-
tools/perf/util/unwind-libunwind_common.c | 7 ++--
tools/perf/util/unwind.h | 5 +++
6 files changed, 76 insertions(+), 4 deletions(-)
create mode 100644 tools/perf/arch/x86/include/libunwind/libunwind-arch.h
diff --git a/tools/perf/arch/x86/include/libunwind/libunwind-arch.h
b/tools/perf/arch/x86/include/libunwind/libunwind-arch.h
new file mode 100644
index 0000000..265f14d
--- /dev/null
+++ b/tools/perf/arch/x86/include/libunwind/libunwind-arch.h
@@ -0,0 +1,18 @@
+#ifndef _LIBUNWIND_ARCH_H
+#define _LIBUNWIND_ARCH_H
+
+#include <libunwind-x86.h>
+#include <../perf_regs.h>
+#include <../../../../../../arch/x86/include/uapi/asm/perf_regs.h>
+
+#define LIBUNWIND_X86_32
+int libunwind__x86_reg_id(int regnum);
+
+#include <../../../x86/util/unwind-libunwind.c>
+
+#define LIBUNWIND__ARCH_REG_ID libunwind__x86_reg_id
+
+#define UNWT_PREFIX UNW_PASTE(UNW_PASTE(_U, x86), _)
+#define UNWT_OBJ(fn) UNW_PASTE(UNWT_PREFIX, fn)
+
+#endif /* _LIBUNWIND_ARCH_H */
diff --git a/tools/perf/arch/x86/util/unwind-libunwind.c
b/tools/perf/arch/x86/util/unwind-libunwind.c
index db25e93..d422fbf 100644
--- a/tools/perf/arch/x86/util/unwind-libunwind.c
+++ b/tools/perf/arch/x86/util/unwind-libunwind.c
@@ -5,6 +5,7 @@
#include "../../util/unwind.h"
#include "../../util/debug.h"
+#ifndef LIBUNWIND_X86_32
#ifdef HAVE_ARCH_X86_64_SUPPORT
int libunwind__arch_reg_id(int regnum)
{
@@ -110,3 +111,44 @@ int libunwind__arch_reg_id(int regnum)
return id;
}
#endif /* HAVE_ARCH_X86_64_SUPPORT */
+#else
+int libunwind__x86_reg_id(int regnum)
+{
+ int id;
+
+ switch (regnum) {
+ case UNW_X86_EAX:
+ id = PERF_REG_X86_AX;
+ break;
+ case UNW_X86_EDX:
+ id = PERF_REG_X86_DX;
+ break;
+ case UNW_X86_ECX:
+ id = PERF_REG_X86_CX;
+ break;
+ case UNW_X86_EBX:
+ id = PERF_REG_X86_BX;
+ break;
+ case UNW_X86_ESI:
+ id = PERF_REG_X86_SI;
+ break;
+ case UNW_X86_EDI:
+ id = PERF_REG_X86_DI;
+ break;
+ case UNW_X86_EBP:
+ id = PERF_REG_X86_BP;
+ break;
+ case UNW_X86_ESP:
+ id = PERF_REG_X86_SP;
+ break;
+ case UNW_X86_EIP:
+ id = PERF_REG_X86_IP;
+ break;
+ default:
+ pr_err("unwind: invalid reg id %d\n", regnum);
+ return -EINVAL;
+ }
+
+ return id;
+}
+#endif /* LIBUNWIND_X86_32 */
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 2e21529..2dd3939 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -1,3 +1,5 @@
+include ../scripts/Makefile.include
+
libperf-y += alias.o
libperf-y += annotate.o
libperf-y += build-id.o
@@ -99,6 +101,10 @@ libperf-$(CONFIG_DWARF) += dwarf-aux.o
libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
libperf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind_common.o
+libperf-$(CONFIG_LIBUNWIND_X86) += unwind-libunwind_x86_32.o
+
+$(OUTPUT)util/unwind-libunwind_x86_32.o: util/unwind-libunwind.c
arch/x86/util/unwind-libunwind.c
+ $(QUIET_CC)$(CC) $(CFLAGS) -DARCH_UNWIND_LIBUNWIND
-Iarch/x86/include/libunwind -c -o $@ util/unwind-libunwind.c
libperf-$(CONFIG_LIBBABELTRACE) += data-convert-bt.o
diff --git a/tools/perf/util/unwind-libunwind.c
b/tools/perf/util/unwind-libunwind.c
index 2a8d24e..1844431 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -527,7 +527,7 @@ static int access_reg(unw_addr_space_t __maybe_unused as,
return 0;
}
- id = libunwind__arch_reg_id(regnum);
+ id = LIBUNWIND__ARCH_REG_ID(regnum);
if (id < 0)
return -EINVAL;
diff --git a/tools/perf/util/unwind-libunwind_common.c
b/tools/perf/util/unwind-libunwind_common.c
index 4bdd3b9..d0128f0 100644
--- a/tools/perf/util/unwind-libunwind_common.c
+++ b/tools/perf/util/unwind-libunwind_common.c
@@ -82,10 +82,11 @@ void unwind__get_arch(struct thread *thread, struct map
*map)
pr_debug("unwind: thread map is X86, 64bit is %d\n", is_64_bit);
if (!is_64_bit) {
#ifdef HAVE_LIBUNWIND_X86_SUPPORT
- pr_err("unwind: target platform=%s is not
implemented\n",
- arch);
-#endif
+ register_unwind_libunwind_ops(
+ &_Ux86_unwind_libunwind_ops, thread);
+#else
register_null_unwind_libunwind_ops(thread);
+#endif
} else
use_local_unwind = 1;
} else {
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index e045600..8f7c4357 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -54,6 +54,11 @@ static inline void unwind__get_arch(struct thread *thread
__maybe_unused,
static inline void
register_null_unwind_libunwind_ops(struct thread *thread __maybe_unused) {}
#endif
+
+#ifdef HAVE_LIBUNWIND_X86_SUPPORT
+extern struct unwind_libunwind_ops _Ux86_unwind_libunwind_ops;
+#endif
+
#else
static inline int
unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
--
1.8.5.2
