[PATCH] Test case of emulating multibyte NOP

[yzt356@gmail.com]

From: Arthur Chunqi Li <yzt356@gmail.com>

Add multibyte NOP test case to kvm-unit-tests. This version adds test cases into x86/realmode.c. This can test one of bugs when booting RHEL5.9 64-bit.

Signed-off-by: Arthur Chunqi Li <yzt356@gmail.com>
---
 x86/realmode.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/x86/realmode.c b/x86/realmode.c
index 981be08..e103ca6 100644
--- a/x86/realmode.c
+++ b/x86/realmode.c
@@ -1504,6 +1504,29 @@ static void test_fninit(void)
 	report("fninit", 0, fsw == 0 && (fcw & 0x103f) == 0x003f);
 }
 
+static void test_nopl(void)
+{
+	MK_INSN(nopl1, ".byte 0x90\n\r"); // 1 byte nop
+	MK_INSN(nopl2, ".byte 0x66, 0x90\n\r"); // 2 bytes nop
+	MK_INSN(nopl3, ".byte 0x0f, 0x1f, 0x00\n\r"); // 3 bytes nop
+	MK_INSN(nopl4, ".byte 0x0f, 0x1f, 0x40, 0x00\n\r"); // 4 bytes nop
+	MK_INSN(nopl5, ".byte 0x0f, 0x1f, 0x44, 0x00, 0x00\n\r"); // 5 bytes nop
+	MK_INSN(nopl6, ".byte 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00\n\r"); // 6 bytes nop
+	MK_INSN(nopl7, ".byte 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00\n\r"); // 7 bytes nop
+	MK_INSN(nopl8, ".byte 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00\n\r"); // 8 bytes nop
+	MK_INSN(nopl9, ".byte 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00\n\r"); // 9 bytes nop
+	exec_in_big_real_mode(&insn_nopl1);
+	exec_in_big_real_mode(&insn_nopl2);
+	exec_in_big_real_mode(&insn_nopl3);
+	exec_in_big_real_mode(&insn_nopl4);
+	exec_in_big_real_mode(&insn_nopl5);
+	exec_in_big_real_mode(&insn_nopl6);
+	exec_in_big_real_mode(&insn_nopl7);
+	exec_in_big_real_mode(&insn_nopl8);
+	exec_in_big_real_mode(&insn_nopl9);
+	report("nopl", 0, 1);
+}
+
 void realmode_start(void)
 {
 	test_null();
@@ -1548,6 +1571,7 @@ void realmode_start(void)
 	test_xlat();
 	test_salc();
 	test_fninit();
+	test_nopl();
 
 	exit(0);
 }
-- 
1.7.9.5