x86/cpu/bugs: Use __initconst for 'const' init data

[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / unwind.h

diff --git a/arch/x86/include/asm/unwind.h b/arch/x86/include/asm/unwind.h
index e9cc6fe1fc6f953c38ddcc61fcf06fd90d72ab04..499578f7e6d7bb5020fe0c503c70b1be0f5b95f1 100644 (file)
--- a/arch/x86/include/asm/unwind.h
+++ b/arch/x86/include/asm/unwind.h
@@ -7,6 +7,9 @@
 #include <asm/ptrace.h>
 #include <asm/stacktrace.h>
 
+#define IRET_FRAME_OFFSET (offsetof(struct pt_regs, ip))
+#define IRET_FRAME_SIZE   (sizeof(struct pt_regs) - IRET_FRAME_OFFSET)
+
 struct unwind_state {
        struct stack_info stack_info;
        unsigned long stack_mask;
@@ -20,6 +23,12 @@ struct unwind_state {
 #elif defined(CONFIG_UNWINDER_FRAME_POINTER)
        bool got_irq;
        unsigned long *bp, *orig_sp, ip;
+       /*
+        * If non-NULL: The current frame is incomplete and doesn't contain a
+        * valid BP. When looking for the next frame, use this instead of the
+        * non-existent saved BP.
+        */
+       unsigned long *next_bp;
        struct pt_regs *regs;
 #else
        unsigned long *sp;
@@ -52,15 +61,28 @@ void unwind_start(struct unwind_state *state, struct task_struct *task,
 }
 
 #if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER)
-static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
+/*
+ * If 'partial' returns true, only the iret frame registers are valid.
+ */
+static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state,
+                                                   bool *partial)
 {
        if (unwind_done(state))
                return NULL;
 
+       if (partial) {
+#ifdef CONFIG_UNWINDER_ORC
+               *partial = !state->full_regs;
+#else
+               *partial = false;
+#endif
+       }
+
        return state->regs;
 }
 #else
-static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
+static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state,
+                                                   bool *partial)
 {
        return NULL;
 }