* Denys Vlasenko <dvlas...@redhat.com> wrote:
> Signed-off-by: Denys Vlasenko <dvlas...@redhat.com>
> CC: Linus Torvalds <torva...@linux-foundation.org>
> CC: Steven Rostedt <rost...@goodmis.org>
> CC: Ingo Molnar <mi...@kernel.org>
> CC: Borislav Petkov <b...@alien8.de>
> CC: "H. Peter Anvin" <h...@zytor.com>
> CC: Andy Lutomirski <l...@amacapital.net>
> CC: Oleg Nesterov <o...@redhat.com>
> CC: Frederic Weisbecker <fweis...@gmail.com>
> CC: Alexei Starovoitov <a...@plumgrid.com>
> CC: Will Drewry <w...@chromium.org>
> CC: Kees Cook <keesc...@chromium.org>
> CC: x...@kernel.org
> CC: linux-kernel@vger.kernel.org
> ---
> arch/x86/kernel/entry_64.S | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
> index 65485b3..15261ba 100644
> --- a/arch/x86/kernel/entry_64.S
> +++ b/arch/x86/kernel/entry_64.S
> @@ -429,6 +429,7 @@ return_from_execve:
> 1:
> /* must use IRET code path (pt_regs->cs may have changed) */
> addq $8, %rsp
> + CFI_ADJUST_CFA_OFFSET -8
> ZERO_EXTRA_REGS
> movq %rax,RAX(%rsp)
> jmp int_ret_from_sys_call
So given that this is a pretty common pattern:
triton:~/tip> git grep -A 1 'addq.*%rsp' arch/x86/kernel/entry_64.S
arch/x86/kernel/entry_64.S: addq $8, %rsp
arch/x86/kernel/entry_64.S- CFI_ADJUST_CFA_OFFSET -8
--
arch/x86/kernel/entry_64.S: addq $8, %rsp
arch/x86/kernel/entry_64.S- DEFAULT_FRAME 0
--
arch/x86/kernel/entry_64.S: addq $8, %rsp
arch/x86/kernel/entry_64.S- DEFAULT_FRAME 0
--
arch/x86/kernel/entry_64.S: addq $-0x80,(%rsp) /* Adjust
vector to [-256,-1] range */
arch/x86/kernel/entry_64.S- interrupt do_IRQ
--
arch/x86/kernel/entry_64.S: addq $0x30,%rsp
arch/x86/kernel/entry_64.S- CFI_ADJUST_CFA_OFFSET -0x30
--
arch/x86/kernel/entry_64.S: addq $0x30,%rsp
arch/x86/kernel/entry_64.S- CFI_ADJUST_CFA_OFFSET -0x30
--
arch/x86/kernel/entry_64.S: addq $(6*8), %rsp
arch/x86/kernel/entry_64.S- CFI_ADJUST_CFA_OFFSET -6*8
--
arch/x86/kernel/entry_64.S: addq $(10*8), %rsp
arch/x86/kernel/entry_64.S- CFI_ADJUST_CFA_OFFSET -10*8
it might make sense to introduce addq_cfi, to further hide the dwarf
uglies?
btw., doesn't:
arch/x86/kernel/entry_64.S: addq $-0x80,(%rsp) /* Adjust
vector to [-256,-1] range */
before the do_IRQ() call need a CFI adjustment as well?
Thanks,
Ingo
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