v4.19.13 snapshot.
diff --git a/arch/x86/include/asm/stacktrace.h b/arch/x86/include/asm/stacktrace.h
new file mode 100644
index 0000000..f335aad
--- /dev/null
+++ b/arch/x86/include/asm/stacktrace.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
+ */
+
+#ifndef _ASM_X86_STACKTRACE_H
+#define _ASM_X86_STACKTRACE_H
+
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
+#include <asm/switch_to.h>
+
+enum stack_type {
+ STACK_TYPE_UNKNOWN,
+ STACK_TYPE_TASK,
+ STACK_TYPE_IRQ,
+ STACK_TYPE_SOFTIRQ,
+ STACK_TYPE_ENTRY,
+ STACK_TYPE_EXCEPTION,
+ STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
+};
+
+struct stack_info {
+ enum stack_type type;
+ unsigned long *begin, *end, *next_sp;
+};
+
+bool in_task_stack(unsigned long *stack, struct task_struct *task,
+ struct stack_info *info);
+
+bool in_entry_stack(unsigned long *stack, struct stack_info *info);
+
+int get_stack_info(unsigned long *stack, struct task_struct *task,
+ struct stack_info *info, unsigned long *visit_mask);
+
+const char *stack_type_name(enum stack_type type);
+
+static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
+{
+ void *begin = info->begin;
+ void *end = info->end;
+
+ return (info->type != STACK_TYPE_UNKNOWN &&
+ addr >= begin && addr < end &&
+ addr + len > begin && addr + len <= end);
+}
+
+#ifdef CONFIG_X86_32
+#define STACKSLOTS_PER_LINE 8
+#else
+#define STACKSLOTS_PER_LINE 4
+#endif
+
+#ifdef CONFIG_FRAME_POINTER
+static inline unsigned long *
+get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
+{
+ if (regs)
+ return (unsigned long *)regs->bp;
+
+ if (task == current)
+ return __builtin_frame_address(0);
+
+ return &((struct inactive_task_frame *)task->thread.sp)->bp;
+}
+#else
+static inline unsigned long *
+get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
+{
+ 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 == current)
+ return __builtin_frame_address(0);
+
+ return (unsigned long *)task->thread.sp;
+}
+
+void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, char *log_lvl);
+
+/* The form of the top of the frame on the stack */
+struct stack_frame {
+ struct stack_frame *next_frame;
+ unsigned long return_address;
+};
+
+struct stack_frame_ia32 {
+ u32 next_frame;
+ u32 return_address;
+};
+
+static inline unsigned long caller_frame_pointer(void)
+{
+ struct stack_frame *frame;
+
+ frame = __builtin_frame_address(0);
+
+#ifdef CONFIG_FRAME_POINTER
+ frame = frame->next_frame;
+#endif
+
+ return (unsigned long)frame;
+}
+
+void show_opcodes(struct pt_regs *regs, const char *loglvl);
+void show_ip(struct pt_regs *regs, const char *loglvl);
+#endif /* _ASM_X86_STACKTRACE_H */