pkgs/development/libraries/glibc/fix-x64-abi.patch

   1 From 3288c6da64add3b4561b8c10fff522027caea01c Mon Sep 17 00:00:00 2001
   2 From: Nicholas Miell <nmiell@gmail.com>
   3 Date: Sat, 17 Jun 2017 18:21:07 -0700
   4 Subject: [PATCH] Align the stack on entry to __tls_get_addr()
   5
   6 Old versions of gcc (4 & 5) didn't align the stack according to the
   7 AMD64 psABI when calling __tls_get_addr(). Apparently new versions of
   8 gcc (7) got much more aggressive about vectorizing and generating MOVAPS
   9 instructions, which means old binaries built with the buggy versions of
  10 gcc are much more likely to crash when using versions of glibc built
  11 using gcc 7.
  12
  13 For example, a large number of Linux games built using the Unity game
  14 engine and available for purchase on Steam.
  15 ---
  16  elf/dl-tls.c | 4 ++++
  17  1 file changed, 4 insertions(+)
  18
  19 diff --git a/elf/dl-tls.c b/elf/dl-tls.c
  20 index 5aba33b3fa..3f3cb917de 100644
  21 --- a/elf/dl-tls.c
  22 +++ b/elf/dl-tls.c
  23 @@ -827,6 +827,10 @@ rtld_hidden_proto (__tls_get_addr)
  24  rtld_hidden_def (__tls_get_addr)
  25  #endif
  26
  27 +#ifdef __x86_64__
  28 +/* Old versions of gcc didn't align the stack. */
  29 +__attribute__((force_align_arg_pointer))
  30 +#endif
  31  /* The generic dynamic and local dynamic model cannot be used in
  32     statically linked applications.  */
  33  void *
  34 --
  35 2.13.0