x86/unwind: Read stack return address in update_stack_state()
authorJosh Poimboeuf <jpoimboe@redhat.com>
Wed, 12 Apr 2017 18:47:11 +0000 (13:47 -0500)
committerIngo Molnar <mingo@kernel.org>
Fri, 14 Apr 2017 08:19:59 +0000 (10:19 +0200)
commit6bcdf9d51b9892dd5c6892d50cf5e9628efb8062
tree79cc242c58b542dba3ecac6ec9255a014014bf5e
parent5ed8d8bb38c5dcd78de540182cedb0fb19399aab
x86/unwind: Read stack return address in update_stack_state()

Instead of reading the return address when unwind_get_return_address()
is called, read it from update_stack_state() and store it in the unwind
state.  This enables the next patch to check the return address from
unwind_next_frame() so it can detect an entry code frame.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/af0c5e4560c49c0343dca486ea26c4fa92bc4e35.1492020577.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/unwind.h
arch/x86/kernel/unwind_frame.c