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