compiler-rt/0001-sanitizer-Remove-rsp-from-the-clobber-list-in-intern.patch
serge-sans-paille 80b9904ccd GCC-9 compatibility patch
Backport rsp-in-clobber-list patch
2019-01-18 09:37:05 +00:00

58 lines
2.1 KiB
Diff

From 4e657713e97a0e0b0ea907d5f8348fc3fedad70a Mon Sep 17 00:00:00 2001
From: cryptoad <cryptoad@91177308-0d34-0410-b5e6-96231b3b80d8>
Date: Thu, 9 Aug 2018 20:01:11 +0000
Subject: [PATCH] [sanitizer] Remove rsp from the clobber list in
internal_clone
Summary:
When compiling with WERROR=ON, a new fatal warning started popping up recently
(due to -Werror,-Winline-asm):
```
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: error: inline asm clobber list contains reserved registers: RSP [-Werror,-Winline-asm]
"syscall\n"
^
<inline asm>:1:1: note: instantiated into assembly here
syscall
^
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
"syscall\n"
^
<inline asm>:1:1: note: instantiated into assembly here
syscall
^
```
Removing `rsp` from the clobber list makes the warning go away, and does not
appear to have a functional impact. If there is another way to solve this, let
me know.
Reviewers: eugenis, vitalybuka
Reviewed By: eugenis
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D50519
git-svn-id: http://llvm.org/svn/llvm-project/compiler-rt/trunk@339370 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/sanitizer_common/sanitizer_linux.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/sanitizer_common/sanitizer_linux.cc b/lib/sanitizer_common/sanitizer_linux.cc
index 6b8b9fd2e..8d39c4d90 100644
--- a/lib/sanitizer_common/sanitizer_linux.cc
+++ b/lib/sanitizer_common/sanitizer_linux.cc
@@ -1244,7 +1244,7 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
"d"(parent_tidptr),
"r"(r8),
"r"(r10)
- : "rsp", "memory", "r11", "rcx");
+ : "memory", "r11", "rcx");
return res;
}
#elif defined(__mips__)
--
2.19.2