mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-24 19:08:30 +00:00
36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
|
From 3288c6da64add3b4561b8c10fff522027caea01c Mon Sep 17 00:00:00 2001
|
||
|
|
From: Nicholas Miell <nmiell@gmail.com>
|
||
|
|
Date: Sat, 17 Jun 2017 18:21:07 -0700
|
||
|
|
Subject: [PATCH] Align the stack on entry to __tls_get_addr()
|
||
|
|
|
||
|
|
Old versions of gcc (4 & 5) didn't align the stack according to the
|
||
|
|
AMD64 psABI when calling __tls_get_addr(). Apparently new versions of
|
||
|
|
gcc (7) got much more aggressive about vectorizing and generating MOVAPS
|
||
|
|
instructions, which means old binaries built with the buggy versions of
|
||
|
|
gcc are much more likely to crash when using versions of glibc built
|
||
|
|
using gcc 7.
|
||
|
|
|
||
|
|
For example, a large number of Linux games built using the Unity game
|
||
|
|
engine and available for purchase on Steam.
|
||
|
|
---
|
||
|
|
elf/dl-tls.c | 4 ++++
|
||
|
|
1 file changed, 4 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/elf/dl-tls.c b/elf/dl-tls.c
|
||
|
|
index 5aba33b3fa..3f3cb917de 100644
|
||
|
|
--- a/elf/dl-tls.c
|
||
|
|
+++ b/elf/dl-tls.c
|
||
|
|
@@ -827,6 +827,10 @@ rtld_hidden_proto (__tls_get_addr)
|
||
|
|
rtld_hidden_def (__tls_get_addr)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
+#ifdef __x86_64__
|
||
|
|
+/* Old versions of gcc didn't align the stack. */
|
||
|
|
+__attribute__((force_align_arg_pointer))
|
||
|
|
+#endif
|
||
|
|
/* The generic dynamic and local dynamic model cannot be used in
|
||
|
|
statically linked applications. */
|
||
|
|
void *
|
||
|
|
--
|
||
|
|
2.13.0
|