jit-x86: fix num of register limitation about potion HOT 4 CLOSED

diff --git a/libudis86/syn-att.c b/libudis86/syn-att.c
index 7a7fc7c..f8d703e 100644
--- a/libudis86/syn-att.c
+++ b/libudis86/syn-att.c
@@ -64,10 +64,16 @@ gen_operand(struct ud* u, struct ud_operand* op)
                                mkasm(u, "-0x%x", (-op->lval.sbyte) & 0xff);
                        else    mkasm(u, "0x%x", op->lval.sbyte);
                } 
-               else if (op->offset == 16) 
-                       mkasm(u, "0x%x", op->lval.uword);
-               else if (op->offset == 32) 
-                       mkasm(u, "0x%lx", op->lval.udword);
+               else if (op->offset == 16) {
+                        if (op->lval.sword < 0) /* rurban: large negative offsets */
+                                mkasm(u, "-0x%x", (-op->lval.sword) & 0xffff);
+                       else    mkasm(u, "0x%x", op->lval.sword);
+                }
+               else if (op->offset == 32) {
+                        if (op->lval.sdword < 0) /* rurban: large negative offsets */
+                                mkasm(u, "-0x%lx", (-op->lval.sdword) & 0xffff);
+                       else    mkasm(u, "0x%lx", op->lval.udword);
+                }
                else if (op->offset == 64) 
                        mkasm(u, "0x" FMT64 "x", op->lval.uqword);