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 <[email protected]> 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. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
