From: Mohammed Gamal <[email protected]>
Signed-off-by: Mohammed Gamal <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
diff --git a/x86/realmode.c b/x86/realmode.c
index 7c358f9..77fc1e1 100644
--- a/x86/realmode.c
+++ b/x86/realmode.c
@@ -1546,6 +1546,63 @@ static void test_das(void)
print_serial("DAS Test: PASS\n");
}
+void test_cwd_cdq()
+{
+ struct regs inregs = { 0 }, outregs;
+
+ /* Sign-bit set */
+ MK_INSN(cwd_1, "mov $0x8000, %ax\n\t"
+ "cwd\n\t");
+
+ /* Sign-bit not set */
+ MK_INSN(cwd_2, "mov $0x1000, %ax\n\t"
+ "cwd\n\t");
+
+ /* Sign-bit set */
+ MK_INSN(cdq_1, "mov $0x80000000, %eax\n\t"
+ "cdq\n\t");
+
+ /* Sign-bit not set */
+ MK_INSN(cdq_2, "mov $0x10000000, %eax\n\t"
+ "cdq\n\t");
+
+ exec_in_big_real_mode(&inregs, &outregs,
+ insn_cwd_1,
+ insn_cwd_1_end - insn_cwd_1);
+
+ if (!regs_equal(&inregs, &outregs, R_AX | R_DX) || outregs.eax !=
0x8000 || outregs.edx != 0xffff)
+ print_serial("cwd Test 1: FAIL\n");
+ else
+ print_serial("cwd Test 1: PASS\n");
+
+ exec_in_big_real_mode(&inregs, &outregs,
+ insn_cwd_2,
+ insn_cwd_2_end - insn_cwd_2);
+
+ if (!regs_equal(&inregs, &outregs, R_AX | R_DX) || outregs.eax !=
0x1000 || outregs.edx != 0)
+ print_serial("cwd Test 2: FAIL\n");
+ else
+ print_serial("cwd Test 2: PASS\n");
+
+ exec_in_big_real_mode(&inregs, &outregs,
+ insn_cdq_1,
+ insn_cdq_1_end - insn_cdq_1);
+
+ if (!regs_equal(&inregs, &outregs, R_AX | R_DX) || outregs.eax !=
0x80000000 || outregs.edx != 0xffffffff)
+ print_serial("cdq Test 1: FAIL\n");
+ else
+ print_serial("cdq Test 1: PASS\n");
+
+ exec_in_big_real_mode(&inregs, &outregs,
+ insn_cdq_2,
+ insn_cdq_2_end - insn_cdq_2);
+
+ if (!regs_equal(&inregs, &outregs, R_AX | R_DX) || outregs.eax !=
0x10000000 || outregs.edx != 0)
+ print_serial("cdq Test 2: FAIL\n");
+ else
+ print_serial("cdq Test 2: PASS\n");
+}
+
void realmode_start(void)
{
test_null();
@@ -1575,6 +1632,7 @@ void realmode_start(void)
test_idiv();
test_loopcc();
test_cbw();
+ test_cwd_cdq();
test_das();
exit(0);
--
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