Add test for fninit/fnstsw/fnstcw instructions emulation. This exact
code sequence is executed by Linux kernel during boot and sometimes gets
emulated by KVM.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
diff --git a/x86/realmode.c b/x86/realmode.c
index 549b36a..f5426e0 100644
--- a/x86/realmode.c
+++ b/x86/realmode.c
@@ -1384,6 +1384,18 @@ static void test_aad(void)
report("aad", R_AX, outregs.eax == 0x123400d4);
}
+static void test_fninit(void)
+{
+ u16 fcw = -1, fsw = -1;
+ MK_INSN(fninit, "fninit ; fnstsw (%eax) ; fnstcw (%ebx)");
+
+ inregs.eax = (u32)&fsw;
+ inregs.ebx = (u32)&fcw;
+
+ exec_in_big_real_mode(&insn_fninit);
+ report("fninit", 0, fsw == 0 && (fcw & 0x103f) == 0x003f);
+}
+
void realmode_start(void)
{
test_null();
@@ -1424,6 +1436,7 @@ void realmode_start(void)
test_movzx_movsx();
test_bswap();
test_aad();
+ test_fninit();
exit(0);
}
--
Gleb.
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