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-rw-r--r--arch/x86/Makefile.um61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/x86/Makefile.um b/arch/x86/Makefile.um
new file mode 100644
index 0000000000..2106a2bd15
--- /dev/null
+++ b/arch/x86/Makefile.um
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: GPL-2.0
+core-y += arch/x86/crypto/
+
+#
+# Disable SSE and other FP/SIMD instructions to match normal x86
+# This is required to work around issues in older LLVM versions, but breaks
+# GCC versions < 11. See:
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99652
+#
+ifeq ($(CONFIG_CC_IS_CLANG),y)
+KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx
+KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2
+endif
+
+ifeq ($(CONFIG_X86_32),y)
+START := 0x8048000
+
+KBUILD_LDFLAGS += -m elf_i386
+ELF_ARCH := i386
+ELF_FORMAT := elf32-i386
+CHECKFLAGS += -D__i386__
+
+KBUILD_CFLAGS += $(call cc-option,-m32)
+KBUILD_AFLAGS += $(call cc-option,-m32)
+LINK-y += $(call cc-option,-m32)
+
+LDS_EXTRA := -Ui386
+export LDS_EXTRA
+
+# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
+include $(srctree)/arch/x86/Makefile_32.cpu
+
+# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
+cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
+
+# Prevent sprintf in nfsd from being converted to strcpy and resulting in
+# an unresolved reference.
+cflags-y += -ffreestanding
+
+KBUILD_CFLAGS += $(cflags-y)
+
+else
+
+START := 0x60000000
+
+KBUILD_CFLAGS += -fno-builtin -m64
+
+CHECKFLAGS += -m64 -D__x86_64__
+KBUILD_AFLAGS += -m64
+KBUILD_LDFLAGS += -m elf_x86_64
+KBUILD_CPPFLAGS += -m64
+
+ELF_ARCH := i386:x86-64
+ELF_FORMAT := elf64-x86-64
+
+# Not on all 64-bit distros /lib is a symlink to /lib64. PLD is an example.
+
+LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib64
+LINK-y += -m64
+
+endif