cmov instruction on 64-bit with dword destination register operand should clear
bits [63:32]. This test checks this behavior due to previous KVM bug.
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
x86/emulator.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/x86/emulator.c b/x86/emulator.c
index 460949f..1fd0ca6 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -710,6 +710,18 @@ static void test_shld_shrd(u32 *mem)
report("shrd (cl)", *mem == ((0x12345678 >> 3) | (5u << 29)));
}
+static void test_cmov(u32 *mem)
+{
+ u64 val;
+ *mem = 0xabcdef12u;
+ asm ("movq $0x1234567812345678, %%rax\n\t"
+ "cmpl %%eax, %%eax\n\t"
+ "cmovnel (%[mem]), %%eax\n\t"
+ "movq %%rax, %[val]\n\t"
+ : [val]"=r"(val) : [mem]"r"(mem) : "%rax", "cc");
+ report("cmovnel", val == 0x12345678ul);
+}
+
#define INSN_XCHG_ALL \
"xchg %rax, 0+save \n\t" \
"xchg %rbx, 8+save \n\t" \
@@ -1054,12 +1066,12 @@ int main()
test_sreg(mem);
test_lldt(mem);
test_ltr(mem);
+ test_cmov(mem);
test_mmx_movq_mf(mem, insn_page, alt_insn_page, insn_ram);
test_movabs(mem, insn_page, alt_insn_page, insn_ram);
test_smsw_reg(mem, insn_page, alt_insn_page, insn_ram);
test_nop(mem, insn_page, alt_insn_page, insn_ram);
-
test_crosspage_mmio(mem);
test_string_io_mmio(mem);
--
1.9.1
--
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