1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h
new file mode 100644
index 000000000000..6e469044e4de
--- /dev/null
+++ b/arch/x86/include/asm/unwind_user.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_UNWIND_USER_H
+#define _ASM_X86_UNWIND_USER_H
+
+#ifdef CONFIG_UNWIND_USER
+
+#include <asm/ptrace.h>
+#include <asm/uprobes.h>
+
+static inline int unwind_user_word_size(struct pt_regs *regs)
+{
+	/* We can't unwind VM86 stacks */
+	if (regs->flags & X86_VM_MASK)
+		return 0;
+	return user_64bit_mode(regs) ? 8 : 4;
+}
+
+#endif /* CONFIG_UNWIND_USER */
+
+#ifdef CONFIG_HAVE_UNWIND_USER_FP
+
+#define ARCH_INIT_USER_FP_FRAME(ws)			\
+	.cfa_off	=  2*(ws),			\
+	.ra_off		= -1*(ws),			\
+	.fp_off		= -2*(ws),			\
+	.use_fp		= true,
+
+#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws)		\
+	.cfa_off	=  1*(ws),			\
+	.ra_off		= -1*(ws),			\
+	.fp_off		= 0,				\
+	.use_fp		= false,
+
+static inline bool unwind_user_at_function_start(struct pt_regs *regs)
+{
+	return is_uprobe_at_func_entry(regs);
+}
+#define unwind_user_at_function_start unwind_user_at_function_start
+
+#endif /* CONFIG_HAVE_UNWIND_USER_FP */
+
+#endif /* _ASM_X86_UNWIND_USER_H */