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[PATCH v3 14/51] x86/asm/head: put real return address on idle task stack

From Josh Poimboeuf <jpoimboe@redhat.com>
Newsgroups linux.kernel
Subject [PATCH v3 14/51] x86/asm/head: put real return address on idle task stack
Date 2016-08-12 16:40 +0200
Message-ID <s5lMT-2Ra-67@gated-at.bofh.it> (permalink)
References <s5lMR-2Ra-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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The frame at the end of each idle task stack has a zeroed return
address.  This is inconsistent with real task stacks, which have a real
return address at that spot.  This inconsistency can be confusing for
stack unwinders.

Make it a real address by using the side effect of a call instruction to
push the instruction pointer on the stack.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
 arch/x86/kernel/head_64.S | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 3621ad2..c90f481 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -298,8 +298,9 @@ ENTRY(start_cpu)
 	 *	REX.W + FF /5 JMP m16:64 Jump far, absolute indirect,
 	 *		address given in m16:64.
 	 */
-	movq	initial_code(%rip),%rax
-	pushq	$0		# fake return address to stop unwinder
+	call	1f		# put return address on stack for unwinder
+1:	xorq	%rbp, %rbp	# clear frame pointer
+	movq	initial_code(%rip), %rax
 	pushq	$__KERNEL_CS	# set correct cs
 	pushq	%rax		# target address in negative space
 	lretq
-- 
2.7.4

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[PATCH v3 00/51] x86/dumpstack: rewrite x86 stack dump code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 49/51] x86/dumpstack: warn on stack recursion Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 36/51] perf/x86: convert perf_callchain_kernel() to use the new unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 26/51] ftrace: add ftrace_graph_ret_addr() stack unwinding helpers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 33/51] x86/dumpstack: add get_stack_info() interface Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 48/51] x86/unwind: warn if stack grows up Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 48/51] x86/unwind: warn if stack grows up Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
      Re: [PATCH v3 48/51] x86/unwind: warn if stack grows up Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 18:30 +0200
  [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 19:40 +0200
      Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to  usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 21:20 +0200
        Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 22:10 +0200
          Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to  usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 22:40 +0200
            Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 22:50 +0200
  [PATCH v3 44/51] x86/dumpstack: print any pt_regs found on the stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 44/51] x86/dumpstack: print any pt_regs found on the stack Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
  [PATCH v3 12/51] x86: move _stext marker to before head code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
      Re: [PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
  [PATCH v3 14/51] x86/asm/head:  put real return address on idle task stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle  task stack Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
    Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle  task stack Nilay Vaish <nilayvaish@gmail.com> - 2016-08-17 22:40 +0200
      Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle  task stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-17 23:20 +0200
  [PATCH v3 16/51] x86/32: put real return address on stack in entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
      Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:10 +0200
        Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code "H. Peter Anvin" <hpa@zytor.com> - 2016-08-15 20:10 +0200
          Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 20:30 +0200
            Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code "H. Peter Anvin" <hpa@zytor.com> - 2016-08-15 21:30 +0200
              Re: [PATCH v3 16/51] x86/32: put real return address on stack in  entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 22:10 +0200
  [PATCH v3 18/51] x86/entry/head/32: use local labels Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 30/51] x86/dumpstack/ftrace: don't print unreliable addresses in print_context_stack_bp() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 42/51] x86/unwind: create stack frames for saved syscall registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 42/51] x86/unwind: create stack frames for saved  syscall registers Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
      Re: [PATCH v3 42/51] x86/unwind: create stack frames for saved  syscall registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 19:00 +0200
  [PATCH v3 28/51] ftrace/x86: implement HAVE_FUNCTION_GRAPH_RET_ADDR_PTR Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 31/51] x86/dumpstack: allow preemption in show_stack_log_lvl() and dump_trace() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 31/51] x86/dumpstack: allow preemption in  show_stack_log_lvl() and dump_trace() Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
      Re: [PATCH v3 31/51] x86/dumpstack: allow preemption in  show_stack_log_lvl() and dump_trace() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
  [PATCH v3 41/51] x86/entry/unwind: create stack frames for saved interrupt registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
    Re: [PATCH v3 41/51] x86/entry/unwind: create stack frames for saved  interrupt registers Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
      Re: [PATCH v3 41/51] x86/entry/unwind: create stack frames for saved  interrupt registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 18:40 +0200
  [PATCH v3 37/51] x86/stacktrace: convert save_stack_trace_*() to use the new unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 05/51] x86/dumpstack: make printk_stack_address() more generally useful Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 43/51] x86/dumpstack: print stack identifier on its own line Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 24/51] ftrace: only allocate the ret_stack 'fp' field when needed Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 29/51] x86/dumpstack/ftrace: mark function graph handler function as unreliable Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
  [PATCH v3 03/51] x86/asm/head: rename 'stack_start' -> 'initial_stack' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
    Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer()  previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
      Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer()  previous stack access Brian Gerst <brgerst@gmail.com> - 2016-08-14 15:00 +0200
        Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer()  previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-14 15:50 +0200
      Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32  kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:10 +0200
        Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32  kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 19:30 +0200
          Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer()  previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-15 22:10 +0200
  [PATCH v3 13/51] x86/asm/head: remove useless zeroed word Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 21/51] oprofile/x86: add regs->ip to oprofile trace Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 10/51] x86/dumpstack: add get_stack_pointer() and get_frame_pointer() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 07/51] x86/dumpstack: remove extra brackets around "<EOE>" Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 17/51] x86/smp: fix initial idle stack location on 32-bit Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 08/51] x86/dumpstack: fix irq stack bounds calculation in show_stack_log_lvl() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 15/51] x86/asm/head: standardize the end of the stack for idle tasks Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
    Re: [PATCH v3 15/51] x86/asm/head: standardize the end of the stack  for idle tasks Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
  [PATCH v3 19/51] x86/entry/32: rename 'error_code' to 'common_exception' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
    Re: [PATCH v3 19/51] x86/entry/32: rename 'error_code' to 'common_exception' Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
      Re: [PATCH v3 19/51] x86/entry/32: rename 'error_code' to  'common_exception' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
  [PATCH v3 23/51] ftrace: remove CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST from config Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
  [PATCH v3 11/51] x86/dumpstack: remove unnecessary stack pointer arguments Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 17:10 +0200

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