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-rw-r--r--include/linux/sched/task_stack.h121
1 files changed, 121 insertions, 0 deletions
diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
new file mode 100644
index 000000000000..df6ea6665b31
--- /dev/null
+++ b/include/linux/sched/task_stack.h
@@ -0,0 +1,121 @@
+#ifndef _LINUX_SCHED_TASK_STACK_H
+#define _LINUX_SCHED_TASK_STACK_H
+
+/*
+ * task->stack (kernel stack) handling interfaces:
+ */
+
+#include <linux/sched.h>
+#include <linux/magic.h>
+
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+
+/*
+ * When accessing the stack of a non-current task that might exit, use
+ * try_get_task_stack() instead. task_stack_page will return a pointer
+ * that could get freed out from under you.
+ */
+static inline void *task_stack_page(const struct task_struct *task)
+{
+ return task->stack;
+}
+
+#define setup_thread_stack(new,old) do { } while(0)
+
+static inline unsigned long *end_of_stack(const struct task_struct *task)
+{
+ return task->stack;
+}
+
+#elif !defined(__HAVE_THREAD_FUNCTIONS)
+
+#define task_stack_page(task) ((void *)(task)->stack)
+
+static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
+{
+ *task_thread_info(p) = *task_thread_info(org);
+ task_thread_info(p)->task = p;
+}
+
+/*
+ * Return the address of the last usable long on the stack.
+ *
+ * When the stack grows down, this is just above the thread
+ * info struct. Going any lower will corrupt the threadinfo.
+ *
+ * When the stack grows up, this is the highest address.
+ * Beyond that position, we corrupt data on the next page.
+ */
+static inline unsigned long *end_of_stack(struct task_struct *p)
+{
+#ifdef CONFIG_STACK_GROWSUP
+ return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
+#else
+ return (unsigned long *)(task_thread_info(p) + 1);
+#endif
+}
+
+#endif
+
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+static inline void *try_get_task_stack(struct task_struct *tsk)
+{
+ return atomic_inc_not_zero(&tsk->stack_refcount) ?
+ task_stack_page(tsk) : NULL;
+}
+
+extern void put_task_stack(struct task_struct *tsk);
+#else
+static inline void *try_get_task_stack(struct task_struct *tsk)
+{
+ return task_stack_page(tsk);
+}
+
+static inline void put_task_stack(struct task_struct *tsk) {}
+#endif
+
+#define task_stack_end_corrupted(task) \
+ (*(end_of_stack(task)) != STACK_END_MAGIC)
+
+static inline int object_is_on_stack(void *obj)
+{
+ void *stack = task_stack_page(current);
+
+ return (obj >= stack) && (obj < (stack + THREAD_SIZE));
+}
+
+extern void thread_stack_cache_init(void);
+
+#ifdef CONFIG_DEBUG_STACK_USAGE
+static inline unsigned long stack_not_used(struct task_struct *p)
+{
+ unsigned long *n = end_of_stack(p);
+
+ do { /* Skip over canary */
+# ifdef CONFIG_STACK_GROWSUP
+ n--;
+# else
+ n++;
+# endif
+ } while (!*n);
+
+# ifdef CONFIG_STACK_GROWSUP
+ return (unsigned long)end_of_stack(p) - (unsigned long)n;
+# else
+ return (unsigned long)n - (unsigned long)end_of_stack(p);
+# endif
+}
+#endif
+extern void set_task_stack_end_magic(struct task_struct *tsk);
+
+#ifndef __HAVE_ARCH_KSTACK_END
+static inline int kstack_end(void *addr)
+{
+ /* Reliable end of stack detection:
+ * Some APM bios versions misalign the stack
+ */
+ return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
+}
+#endif
+
+#endif /* _LINUX_SCHED_TASK_STACK_H */