x86: disable SSE on 32-bit hosts
On 64-bit hosts we are disabling SSE and SSE2. Depending on the
compiler however it may use movq instructions for 64-bit transfers
even when targeting 32-bit processors; when CR4.OSFXSR is not set,
this results in an undefined opcode exception, so tell the compiler
to avoid those instructions on 32-bit hosts as well.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200616140217.104362-1-pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/x86/Makefile.i386 b/x86/Makefile.i386
index d801b80..be9d6bc 100644
--- a/x86/Makefile.i386
+++ b/x86/Makefile.i386
@@ -1,6 +1,7 @@
cstart.o = $(TEST_DIR)/cstart.o
bits = 32
ldarch = elf32-i386
+COMMON_CFLAGS += -mno-sse -mno-sse2
cflatobjs += lib/x86/setjmp32.o
