Check if the emulator throws #UD on illegal LEA.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Michal Luczaj <mhal@xxxxxxx>
---
v1 -> v2: Instead of racing decoder make use of force_emulation_prefix
x86/emulator.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/x86/emulator.c b/x86/emulator.c
index cd78e3c..c3898f2 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -895,6 +895,24 @@ static void test_mov_dr(uint64_t *mem)
report(rax == DR6_ACTIVE_LOW, "mov_dr6");
}
+static void illegal_lea_handler(struct ex_regs *regs)
+{
+ extern char illegal_lea_cont;
+
+ ++exceptions;
+ regs->rip = (ulong)&illegal_lea_cont;
+}
+
+static void test_illegal_lea(uint64_t *mem)
+{
+ exceptions = 0;
+ handle_exception(UD_VECTOR, illegal_lea_handler);
+ asm(KVM_FEP ".byte 0x48; .byte 0x8d; .byte 0xc0\n\t"
+ "illegal_lea_cont:" : : : "rax");
+ report(exceptions == 1, "illegal lea");
+ handle_exception(UD_VECTOR, 0);
+}
+
static void test_push16(uint64_t *mem)
{
uint64_t rsp1, rsp2;
@@ -1193,6 +1211,7 @@ int main(void)
test_smsw_reg(mem);
test_nop(mem);
test_mov_dr(mem);
+ test_illegal_lea(mem);
} else {
report_skip("skipping register-only tests, "
"use kvm.force_emulation_prefix=1 to enable");
--
2.32.0
