diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index ba29a0613e66ffa83162692f05e367e7dd129d82..a24340b3e9e142766fe65cb03394132a73cd3d7f 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -3,11 +3,26 @@
#define __LINUX_STACKTRACE_H
#include <linux/types.h>
+#include <asm/errno.h>
struct task_struct;
struct pt_regs;
#ifdef CONFIG_STACKTRACE
+void stack_trace_print(unsigned long *trace, unsigned int nr_entries,
+ int spaces);
+int stack_trace_snprint(char *buf, size_t size, unsigned long *entries,
+ unsigned int nr_entries, int spaces);
+unsigned int stack_trace_save(unsigned long *store, unsigned int size,
+ unsigned int skipnr);
+unsigned int stack_trace_save_tsk(struct task_struct *task,
+ unsigned long *store, unsigned int size,
+ unsigned int skipnr);
+unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
+ unsigned int size, unsigned int skipnr);
+unsigned int stack_trace_save_user(unsigned long *store, unsigned int size);
+
+/* Internal interfaces. Do not use in generic code */
struct stack_trace {
unsigned int nr_entries, max_entries;
unsigned long *entries;
@@ -41,4 +56,16 @@ extern void save_stack_trace_user(struct stack_trace *trace);
# define save_stack_trace_tsk_reliable(tsk, trace) ({ -ENOSYS; })
#endif /* CONFIG_STACKTRACE */
+#if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE)
+int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
+ unsigned int size);
+#else
+static inline int stack_trace_save_tsk_reliable(struct task_struct *tsk,
+ unsigned long *store,
+ unsigned int size)
+{
+ return -ENOSYS;
+}
+#endif
+
#endif /* __LINUX_STACKTRACE_H */
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index f8edee9c792de527cfb968664cc1ae91ea062d1f..b38333b3bc181f2d33db80b2c1c75fa92550ca95 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -11,35 +11,54 @@
#include <linux/kallsyms.h>
#include <linux/stacktrace.h>
-void print_stack_trace(struct stack_trace *trace, int spaces)
+/**
+ * stack_trace_print - Print the entries in the stack trace
+ * @entries: Pointer to storage array
+ * @nr_entries: Number of entries in the storage array
+ * @spaces: Number of leading spaces to print
+ */
+void stack_trace_print(unsigned long *entries, unsigned int nr_entries,
+ int spaces)
{
- int i;
+ unsigned int i;
- if (WARN_ON(!trace->entries))
+ if (WARN_ON(!entries))
return;
- for (i = 0; i < trace->nr_entries; i++)
- printk("%*c%pS\n", 1 + spaces, ' ', (void *)trace->entries[i]);
+ for (i = 0; i < nr_entries; i++)
+ printk("%*c%pS\n", 1 + spaces, ' ', (void *)entries[i]);
+}
+EXPORT_SYMBOL_GPL(stack_trace_print);
+
+void print_stack_trace(struct stack_trace *trace, int spaces)
+{
+ stack_trace_print(trace->entries, trace->nr_entries, spaces);
}
EXPORT_SYMBOL_GPL(print_stack_trace);
-int snprint_stack_trace(char *buf, size_t size,
- struct stack_trace *trace, int spaces)
+/**
+ * stack_trace_snprint - Print the entries in the stack trace into a buffer
+ * @buf: Pointer to the print buffer
+ * @size: Size of the print buffer
+ * @entries: Pointer to storage array
+ * @nr_entries: Number of entries in the storage array
+ * @spaces: Number of leading spaces to print
+ *
+ * Return: Number of bytes printed.
+ */
+int stack_trace_snprint(char *buf, size_t size, unsigned long *entries,
+ unsigned int nr_entries, int spaces)
{
- int i;
- int generated;
- int total = 0;
+ unsigned int generated, i, total = 0;
- if (WARN_ON(!trace->entries))
+ if (WARN_ON(!entries))
return 0;
- for (i = 0; i < trace->nr_entries; i++) {
+ for (i = 0; i < nr_entries && size; i++) {
generated = snprintf(buf, size, "%*c%pS\n", 1 + spaces, ' ',
- (void *)trace->entries[i]);
+ (void *)entries[i]);
total += generated;
-
- /* Assume that generated isn't a negative number */
if (generated >= size) {
buf += size;
size = 0;
@@ -51,6 +70,14 @@ int snprint_stack_trace(char *buf, size_t size,
return total;
}
+EXPORT_SYMBOL_GPL(stack_trace_snprint);
+
+int snprint_stack_trace(char *buf, size_t size,
+ struct stack_trace *trace, int spaces)
+{
+ return stack_trace_snprint(buf, size, trace->entries,
+ trace->nr_entries, spaces);
+}
EXPORT_SYMBOL_GPL(snprint_stack_trace);
/*
@@ -77,3 +104,116 @@ save_stack_trace_tsk_reliable(struct task_struct *tsk,
WARN_ONCE(1, KERN_INFO "save_stack_tsk_reliable() not implemented yet.\n");
return -ENOSYS;
}
+
+/**
+ * stack_trace_save - Save a stack trace into a storage array
+ * @store: Pointer to storage array
+ * @size: Size of the storage array
+ * @skipnr: Number of entries to skip at the start of the stack trace
+ *
+ * Return: Number of trace entries stored
+ */
+unsigned int stack_trace_save(unsigned long *store, unsigned int size,
+ unsigned int skipnr)
+{
+ struct stack_trace trace = {
+ .entries = store,
+ .max_entries = size,
+ .skip = skipnr + 1,
+ };
+
+ save_stack_trace(&trace);
+ return trace.nr_entries;
+}
+EXPORT_SYMBOL_GPL(stack_trace_save);
+
+/**
+ * stack_trace_save_tsk - Save a task stack trace into a storage array
+ * @task: The task to examine
+ * @store: Pointer to storage array
+ * @size: Size of the storage array
+ * @skipnr: Number of entries to skip at the start of the stack trace
+ *
+ * Return: Number of trace entries stored
+ */
+unsigned int stack_trace_save_tsk(struct task_struct *task,
+ unsigned long *store, unsigned int size,
+ unsigned int skipnr)
+{
+ struct stack_trace trace = {
+ .entries = store,
+ .max_entries = size,
+ .skip = skipnr + 1,
+ };
+
+ save_stack_trace_tsk(task, &trace);
+ return trace.nr_entries;
+}
+
+/**
+ * stack_trace_save_regs - Save a stack trace based on pt_regs into a storage array
+ * @regs: Pointer to pt_regs to examine
+ * @store: Pointer to storage array
+ * @size: Size of the storage array
+ * @skipnr: Number of entries to skip at the start of the stack trace
+ *
+ * Return: Number of trace entries stored
+ */
+unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
+ unsigned int size, unsigned int skipnr)
+{
+ struct stack_trace trace = {
+ .entries = store,
+ .max_entries = size,
+ .skip = skipnr,
+ };
+
+ save_stack_trace_regs(regs, &trace);
+ return trace.nr_entries;
+}
+
+#ifdef CONFIG_HAVE_RELIABLE_STACKTRACE
+/**
+ * stack_trace_save_tsk_reliable - Save task stack with verification
+ * @tsk: Pointer to the task to examine
+ * @store: Pointer to storage array
+ * @size: Size of the storage array
+ *
+ * Return: An error if it detects any unreliable features of the
+ * stack. Otherwise it guarantees that the stack trace is
+ * reliable and returns the number of entries stored.
+ *
+ * If the task is not 'current', the caller *must* ensure the task is inactive.
+ */
+int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
+ unsigned int size)
+{
+ struct stack_trace trace = {
+ .entries = store,
+ .max_entries = size,
+ };
+ int ret = save_stack_trace_tsk_reliable(tsk, &trace);
+
+ return ret ? ret : trace.nr_entries;
+}
+#endif
+
+#ifdef CONFIG_USER_STACKTRACE_SUPPORT
+/**
+ * stack_trace_save_user - Save a user space stack trace into a storage array
+ * @store: Pointer to storage array
+ * @size: Size of the storage array
+ *
+ * Return: Number of trace entries stored
+ */
+unsigned int stack_trace_save_user(unsigned long *store, unsigned int size)
+{
+ struct stack_trace trace = {
+ .entries = store,
+ .max_entries = size,
+ };
+
+ save_stack_trace_user(&trace);
+ return trace.nr_entries;
+}
+#endif /* CONFIG_USER_STACKTRACE_SUPPORT */