x86: print offset value in memory reference instruction properly when offset is negative. bug reported by Le Dinh Long

arch/X86/X86ATTInstPrinter.c

@@ -435,10 +435,7 @@ static void printMemReference(MCInst *MI, unsigned Op, SStream *O)
 			MI->flat_insn.x86.operands[MI->flat_insn.x86.op_count].mem.disp = DispVal;
 		if (DispVal || (!MCOperand_getReg(IndexReg) && !MCOperand_getReg(BaseReg))) {
 			if (DispVal < 0) {
-				if (DispVal < -HEX_THRESHOLD)
-					SStream_concat(O, "-0x%"PRIx64, -DispVal);
-				else
-					SStream_concat(O, "-%"PRIu64, -DispVal);
+				SStream_concat(O, "0x%"PRIx64, ((1L << (8*MI->csh->mode)) - 1) & DispVal);
 			} else {
 				if (DispVal > HEX_THRESHOLD)
 					SStream_concat(O, "0x%"PRIx64, DispVal);

arch/X86/X86IntelInstPrinter.c

@@ -449,7 +449,7 @@ static void _printOperand(MCInst *MI, unsigned OpNo, SStream *O)
 	}
 }
 
-static void printMemReference(MCInst *MI, unsigned Op, SStream *O)	// qqq
+static void printMemReference(MCInst *MI, unsigned Op, SStream *O)
 {
 	MCOperand *BaseReg  = MCInst_getOperand(MI, Op);
 	uint64_t ScaleVal = MCOperand_getImm(MCInst_getOperand(MI, Op+1));
@@ -496,18 +496,11 @@ static void printMemReference(MCInst *MI, unsigned Op, SStream *O)	// qqq
 			MI->flat_insn.x86.operands[MI->flat_insn.x86.op_count].mem.disp = DispVal;
 		if (DispVal || (!MCOperand_getReg(IndexReg) && !MCOperand_getReg(BaseReg))) {
 			if (NeedPlus) {
-				if (DispVal > 0)
-					SStream_concat(O, " + ");
-				else {
-					SStream_concat(O, " - ");
-					DispVal = -DispVal;
-				}
+				SStream_concat(O, " + ");
 			}
+
 			if (DispVal < 0) {
-				if (DispVal < -HEX_THRESHOLD)
-					SStream_concat(O, "-0x%"PRIx64, -DispVal);
-				else
-					SStream_concat(O, "-%"PRIu64, -DispVal);
+				SStream_concat(O, "0x%"PRIx64, ((1L << (8*MI->csh->mode)) - 1) & DispVal);
 			} else {
 				if (DispVal > HEX_THRESHOLD)
 					SStream_concat(O, "0x%"PRIx64, DispVal);