x86/dumpstack: Add get_stack_pointer() and get_frame_pointer()

[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / stacktrace.h

diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
index 7646fb2772f801a0950ec7c9ecbbcf4122e9ebcd..3552f5e7189e74b54ada5bee83dcc4dc47a155f0 100644 (file)
--- a/arch/x86/include/asm/stacktrace.h
+++ b/arch/x86/include/asm/stacktrace.h
@@ -50,36 +50,41 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
 
 #ifdef CONFIG_X86_32
 #define STACKSLOTS_PER_LINE 8
-#define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
 #else
 #define STACKSLOTS_PER_LINE 4
-#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
 #endif
 
 #ifdef CONFIG_FRAME_POINTER
-static inline unsigned long
-stack_frame(struct task_struct *task, struct pt_regs *regs)
+static inline unsigned long *
+get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
 {
-       unsigned long bp;
-
        if (regs)
-               return regs->bp;
+               return (unsigned long *)regs->bp;
 
-       if (task == current) {
-               /* Grab bp right from our regs */
-               get_bp(bp);
-               return bp;
-       }
+       if (!task || task == current)
+               return __builtin_frame_address(0);
 
-       return ((struct inactive_task_frame *)task->thread.sp)->bp;
+       return (unsigned long *)((struct inactive_task_frame *)task->thread.sp)->bp;
 }
 #else
-static inline unsigned long
-stack_frame(struct task_struct *task, struct pt_regs *regs)
+static inline unsigned long *
+get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
 {
-       return 0;
+       return NULL;
+}
+#endif /* CONFIG_FRAME_POINTER */
+
+static inline unsigned long *
+get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
+{
+       if (regs)
+               return (unsigned long *)kernel_stack_pointer(regs);
+
+       if (!task || task == current)
+               return __builtin_frame_address(0);
+
+       return (unsigned long *)task->thread.sp;
 }
-#endif
 
 extern void
 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
@@ -106,7 +111,7 @@ static inline unsigned long caller_frame_pointer(void)
 {
        struct stack_frame *frame;
 
-       get_bp(frame);
+       frame = __builtin_frame_address(0);
 
 #ifdef CONFIG_FRAME_POINTER
        frame = frame->next_frame;