[RFC,07/10] unwind/x86: Add HAVE_USER_UNWIND
Commit Message
Use ARCH_INIT_USER_FP_FRAME to describe how frame pointers are unwound
on x86, and enable HAVE_USER_UNWIND accordinlgy so the user unwind
interfaces can be used.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
arch/x86/Kconfig | 1 +
arch/x86/include/asm/user_unwind.h | 11 +++++++++++
2 files changed, 12 insertions(+)
create mode 100644 arch/x86/include/asm/user_unwind.h
@@ -278,6 +278,7 @@ config X86
select HAVE_UACCESS_VALIDATION if HAVE_OBJTOOL
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_USER_RETURN_NOTIFIER
+ select HAVE_USER_UNWIND
select HAVE_GENERIC_VDSO
select HOTPLUG_PARALLEL if SMP && X86_64
select HOTPLUG_SMT if SMP
new file mode 100644
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_USER_UNWIND_H
+#define _ASM_X86_USER_UNWIND_H
+
+#define ARCH_INIT_USER_FP_FRAME \
+ .ra_off = sizeof(long) * -1, \
+ .cfa_off = sizeof(long) * 2, \
+ .fp_off = sizeof(long) * -2, \
+ .use_fp = true,
+
+#endif /* _ASM_X86_USER_UNWIND_H */