User stack dump feature is recently added for powerpc. But there was no
test case available to test it. This test works same as other on arch by
preparing stack frame on perf test thread and comparing each frame by
unwinding it.
$ ./perf test 50
50: Test dwarf unwind : Ok
User stack dump for powerpc: https://lkml.org/lkml/2016/4/28/482
Signed-off-by: Ravi Bangoria <ravi.bango...@linux.vnet.ibm.com>
---
tools/perf/arch/powerpc/Build | 1 +
tools/perf/arch/powerpc/include/arch-tests.h | 13 ++++
tools/perf/arch/powerpc/include/perf_regs.h | 2 +
tools/perf/arch/powerpc/tests/Build | 4 ++
tools/perf/arch/powerpc/tests/arch-tests.c | 15 +++++
tools/perf/arch/powerpc/tests/dwarf-unwind.c | 62 ++++++++++++++++++
tools/perf/arch/powerpc/tests/regs_load.S | 94 ++++++++++++++++++++++++++++
tools/perf/tests/Build | 2 +-
tools/perf/tests/dwarf-unwind.c | 2 +-
9 files changed, 193 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/arch/powerpc/include/arch-tests.h
create mode 100644 tools/perf/arch/powerpc/tests/Build
create mode 100644 tools/perf/arch/powerpc/tests/arch-tests.c
create mode 100644 tools/perf/arch/powerpc/tests/dwarf-unwind.c
create mode 100644 tools/perf/arch/powerpc/tests/regs_load.S
diff --git a/tools/perf/arch/powerpc/Build b/tools/perf/arch/powerpc/Build
index 54afe4a..db52fa2 100644
--- a/tools/perf/arch/powerpc/Build
+++ b/tools/perf/arch/powerpc/Build
@@ -1 +1,2 @@
libperf-y += util/
+libperf-y += tests/
diff --git a/tools/perf/arch/powerpc/include/arch-tests.h
b/tools/perf/arch/powerpc/include/arch-tests.h
new file mode 100644
index 0000000..84d8ded
--- /dev/null
+++ b/tools/perf/arch/powerpc/include/arch-tests.h
@@ -0,0 +1,13 @@
+#ifndef ARCH_TESTS_H
+#define ARCH_TESTS_H
+
+#ifdef HAVE_DWARF_UNWIND_SUPPORT
+struct thread;
+struct perf_sample;
+int test__arch_unwind_sample(struct perf_sample *sample,
+ struct thread *thread);
+#endif
+
+extern struct test arch_tests[];
+
+#endif
diff --git a/tools/perf/arch/powerpc/include/perf_regs.h
b/tools/perf/arch/powerpc/include/perf_regs.h
index 75de0e9..c12f4e8 100644
--- a/tools/perf/arch/powerpc/include/perf_regs.h
+++ b/tools/perf/arch/powerpc/include/perf_regs.h
@@ -5,6 +5,8 @@
#include <linux/types.h>
#include <asm/perf_regs.h>
+void perf_regs_load(u64 *regs);
+
#define PERF_REGS_MASK ((1ULL << PERF_REG_POWERPC_MAX) - 1)
#define PERF_REGS_MAX PERF_REG_POWERPC_MAX
#ifdef __powerpc64__
diff --git a/tools/perf/arch/powerpc/tests/Build
b/tools/perf/arch/powerpc/tests/Build
new file mode 100644
index 0000000..d827ef3
--- /dev/null
+++ b/tools/perf/arch/powerpc/tests/Build
@@ -0,0 +1,4 @@
+libperf-$(CONFIG_DWARF_UNWIND) += regs_load.o
+libperf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
+
+libperf-y += arch-tests.o
diff --git a/tools/perf/arch/powerpc/tests/arch-tests.c
b/tools/perf/arch/powerpc/tests/arch-tests.c
new file mode 100644
index 0000000..e24f462
--- /dev/null
+++ b/tools/perf/arch/powerpc/tests/arch-tests.c
@@ -0,0 +1,15 @@
+#include <string.h>
+#include "tests/tests.h"
+#include "arch-tests.h"
+
+struct test arch_tests[] = {
+#ifdef HAVE_DWARF_UNWIND_SUPPORT
+ {
+ .desc = "Test dwarf unwind",
+ .func = test__dwarf_unwind,
+ },
+#endif
+ {
+ .func = NULL,
+ },
+};
diff --git a/tools/perf/arch/powerpc/tests/dwarf-unwind.c
b/tools/perf/arch/powerpc/tests/dwarf-unwind.c
new file mode 100644
index 0000000..0bac313
--- /dev/null
+++ b/tools/perf/arch/powerpc/tests/dwarf-unwind.c
@@ -0,0 +1,62 @@
+#include <string.h>
+#include "perf_regs.h"
+#include "thread.h"
+#include "map.h"
+#include "event.h"
+#include "debug.h"
+#include "tests/tests.h"
+#include "arch-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_POWERPC_R1];
+
+ 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/powerpc/tests/regs_load.S
b/tools/perf/arch/powerpc/tests/regs_load.S
new file mode 100644
index 0000000..d76c9a3
--- /dev/null
+++ b/tools/perf/arch/powerpc/tests/regs_load.S
@@ -0,0 +1,94 @@
+#include <linux/linkage.h>
+
+/* Offset is based on macros from arch/powerpc/include/uapi/asm/ptrace.h. */
+#define R0 0
+#define R1 1 * 8
+#define R2 2 * 8
+#define R3 3 * 8
+#define R4 4 * 8
+#define R5 5 * 8
+#define R6 6 * 8
+#define R7 7 * 8
+#define R8 8 * 8
+#define R9 9 * 8
+#define R10 10 * 8
+#define R11 11 * 8
+#define R12 12 * 8
+#define R13 13 * 8
+#define R14 14 * 8
+#define R15 15 * 8
+#define R16 16 * 8
+#define R17 17 * 8
+#define R18 18 * 8
+#define R19 19 * 8
+#define R20 20 * 8
+#define R21 21 * 8
+#define R22 22 * 8
+#define R23 23 * 8
+#define R24 24 * 8
+#define R25 25 * 8
+#define R26 26 * 8
+#define R27 27 * 8
+#define R28 28 * 8
+#define R29 29 * 8
+#define R30 30 * 8
+#define R31 31 * 8
+#define NIP 32 * 8
+#define CTR 35 * 8
+#define LINK 36 * 8
+#define XER 37 * 8
+
+.globl perf_regs_load
+perf_regs_load:
+ std 0, R0(3)
+ std 1, R1(3)
+ std 2, R2(3)
+ std 3, R3(3)
+ std 4, R4(3)
+ std 5, R5(3)
+ std 6, R6(3)
+ std 7, R7(3)
+ std 8, R8(3)
+ std 9, R9(3)
+ std 10, R10(3)
+ std 11, R11(3)
+ std 12, R12(3)
+ std 13, R13(3)
+ std 14, R14(3)
+ std 15, R15(3)
+ std 16, R16(3)
+ std 17, R17(3)
+ std 18, R18(3)
+ std 19, R19(3)
+ std 20, R20(3)
+ std 21, R21(3)
+ std 22, R22(3)
+ std 23, R23(3)
+ std 24, R24(3)
+ std 25, R25(3)
+ std 26, R26(3)
+ std 27, R27(3)
+ std 28, R28(3)
+ std 29, R29(3)
+ std 30, R30(3)
+ std 31, R31(3)
+
+ /* store NIP */
+ mflr 4
+ std 4, NIP(3)
+
+ /* Store LR */
+ std 4, LINK(3)
+
+ /* Store XER */
+ mfxer 4
+ std 4, XER(3)
+
+ /* Store CTR */
+ mfctr 4
+ std 4, CTR(3)
+
+ /* Restore original value of r4 */
+ ld 4, R4(3)
+
+ blr
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index dc51bc5..8a4ce49 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -71,7 +71,7 @@ $(OUTPUT)tests/llvm-src-relocation.c:
tests/bpf-script-test-relocation.c tests/B
$(Q)sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
$(Q)echo ';' >> $@
-ifeq ($(ARCH),$(filter $(ARCH),x86 arm arm64))
+ifeq ($(ARCH),$(filter $(ARCH),x86 arm arm64 powerpc))
perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
endif
diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index 8f6eb85..1046491 100644
--- a/tools/perf/tests/dwarf-unwind.c
+++ b/tools/perf/tests/dwarf-unwind.c
@@ -11,7 +11,7 @@
#include "thread.h"
#include "callchain.h"
-#if defined (__x86_64__) || defined (__i386__)
+#if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__)
#include "arch-tests.h"
#endif
--
1.8.5.6
