queue-4.19/parisc-regs_return_value-should-return-gpr28.patch

   1 From 45efd871bf0a47648f119d1b41467f70484de5bc Mon Sep 17 00:00:00 2001
   2 From: Sven Schnelle <svens@stackframe.org>
   3 Date: Thu, 4 Apr 2019 18:16:03 +0200
   4 Subject: parisc: regs_return_value() should return gpr28
   5
   6 From: Sven Schnelle <svens@stackframe.org>
   7
   8 commit 45efd871bf0a47648f119d1b41467f70484de5bc upstream.
   9
  10 While working on kretprobes for PA-RISC I was wondering while the
  11 kprobes sanity test always fails on kretprobes. This is caused by
  12 returning gpr20 instead of gpr28.
  13
  14 Signed-off-by: Sven Schnelle <svens@stackframe.org>
  15 Signed-off-by: Helge Deller <deller@gmx.de>
  16 Cc: stable@vger.kernel.org # 4.14+
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  arch/parisc/include/asm/ptrace.h |    2 +-
  21  1 file changed, 1 insertion(+), 1 deletion(-)
  22
  23 --- a/arch/parisc/include/asm/ptrace.h
  24 +++ b/arch/parisc/include/asm/ptrace.h
  25 @@ -22,7 +22,7 @@ unsigned long profile_pc(struct pt_regs
  26
  27  static inline unsigned long regs_return_value(struct pt_regs *regs)
  28  {
  29 -       return regs->gr[20];
  30 +       return regs->gr[28];
  31  }
  32
  33  static inline void instruction_pointer_set(struct pt_regs *regs,