summaryrefslogtreecommitdiff
path: root/arch/x86/Makefile.um
diff options
context:
space:
mode:
authorDavid Gow <davidgow@google.com>2022-12-17 07:44:35 +0300
committerRichard Weinberger <richard@nod.at>2023-02-10 23:28:25 +0300
commit8849818679478933dd1d9718741f4daa3f4e8b86 (patch)
tree9cf7727eca7cb8ea2993909f1eace565aae8f56f /arch/x86/Makefile.um
parent905a77077573056d7af508f35373f66ed8b4a39e (diff)
downloadlinux-8849818679478933dd1d9718741f4daa3f4e8b86.tar.xz
rust: arch/um: Disable FP/SIMD instruction to match x86
The kernel disables all SSE and similar FP/SIMD instructions on x86-based architectures (partly because we shouldn't be using floats in the kernel, and partly to avoid the need for stack alignment, see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 ) UML does not do the same thing, which isn't in itself a problem, but does add to the list of differences between UML and "normal" x86 builds. In addition, there was a crash bug with LLVM < 15 / rustc < 1.65 when building with SSE, so disabling it fixes rust builds with earlier compiler versions, see: https://github.com/Rust-for-Linux/linux/pull/881 Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Sergio González Collado <sergio.collado@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/x86/Makefile.um')
-rw-r--r--arch/x86/Makefile.um6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/Makefile.um b/arch/x86/Makefile.um
index b3c1ae084180..d2e95d1d4db7 100644
--- a/arch/x86/Makefile.um
+++ b/arch/x86/Makefile.um
@@ -1,6 +1,12 @@
# SPDX-License-Identifier: GPL-2.0
core-y += arch/x86/crypto/
+#
+# Disable SSE and other FP/SIMD instructions to match normal x86
+#
+KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx
+KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2
+
ifeq ($(CONFIG_X86_32),y)
START := 0x8048000