LOCK instruction: ensure it is always illegal on opcodes 90h and ECh.

2025-05-18 02:20:18 +02:00
parent 30d7c8f51c
commit b3147ee473
4 changed files with 36 additions and 5 deletions
--- a/src/cpu/x86_ops_misc.h
+++ b/src/cpu/x86_ops_misc.h
@@ -753,7 +753,7 @@ opLOCK(uint32_t fetchdat)
        return 0;
    cpu_state.pc++;

-    ILLEGAL_ON((fetchdat & 0xff) == 0x90);
+    ILLEGAL_ON(((fetchdat & 0xff) == 0x90) || ((fetchdat & 0xff) == 0xec));

    CLOCK_CYCLES(4);
    PREFETCH_PREFIX();