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authorMichal Simek <monstr@monstr.eu>2009-11-10 15:57:01 +0100
committerMichal Simek <monstr@monstr.eu>2009-12-14 08:40:09 +0100
commit24b45a12c21132e78e14f3aedf74bb1297228072 (patch)
treedd06c0079e64f00e9e52caed191a84705c9552e3
parent7cf79d59ea650ae82868a99cc2954871d2a239bf (diff)
microblaze: Stack trace support
This is working implemetation but the problem is that Microblaze misses frame pointer that's why is there big loop which trace and show all addresses which are in text. It shows addresses which are in registers, etc. This is problem and this is the reason why all Microblaze traces are wrong. There is an option to do hacks and trace the kernel code but this is too complicated. Signed-off-by: Michal Simek <monstr@monstr.eu>
-rw-r--r--arch/microblaze/Kconfig3
-rw-r--r--arch/microblaze/kernel/Makefile1
-rw-r--r--arch/microblaze/kernel/stacktrace.c65
3 files changed, 69 insertions, 0 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index bbd8327f1890..8e1c4f7d3e6e 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -57,6 +57,9 @@ config GENERIC_GPIO
config GENERIC_CSUM
def_bool y
+config STACKTRACE_SUPPORT
+ def_bool y
+
config PCI
def_bool n
diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index fddd0c403d40..c465a5c4669c 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -16,5 +16,6 @@ obj-$(CONFIG_SELFMOD) += selfmod.o
obj-$(CONFIG_HEART_BEAT) += heartbeat.o
obj-$(CONFIG_MODULES) += microblaze_ksyms.o module.o
obj-$(CONFIG_MMU) += misc.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += entry$(MMU).o
diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
new file mode 100644
index 000000000000..123692f22647
--- /dev/null
+++ b/arch/microblaze/kernel/stacktrace.c
@@ -0,0 +1,65 @@
+/*
+ * Stack trace support for Microblaze.
+ *
+ * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2009 PetaLogix
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <linux/ptrace.h>
+#include <linux/module.h>
+
+/* FIXME initial support */
+void save_stack_trace(struct stack_trace *trace)
+{
+ unsigned long *sp;
+ unsigned long addr;
+ asm("addik %0, r1, 0" : "=r" (sp));
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr)) {
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = addr;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+ unsigned int *sp;
+ unsigned long addr;
+
+ struct thread_info *ti = task_thread_info(tsk);
+
+ if (tsk == current)
+ asm("addik %0, r1, 0" : "=r" (sp));
+ else
+ sp = (unsigned int *)ti->cpu_context.r1;
+
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr)) {
+ if (trace->skip > 0)
+ trace->skip--;
+ else
+ trace->entries[trace->nr_entries++] = addr;
+
+ if (trace->nr_entries >= trace->max_entries)
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);