Implement 'wao jinf' to assemble infinite loop instruction ##asm

* Done for x86, arm16, arm32 and arm64

libr/core/hack.c

@@ -1,4 +1,4 @@
-/* radare - LGPL - Copyright 2011-2012 - pancake */
+/* radare - LGPL - Copyright 2011-2019 - pancake */
 
 #include <r_core.h>
 
@@ -11,6 +11,7 @@ void r_core_hack_help(const RCore *core) {
 	const char* help_msg[] = {
 		"wao", " [op]", "performs a modification on current opcode",
 		"wao", " nop", "nop current opcode",
+		"wao", " jinf", "assemble an infinite loop",
 		"wao", " jz", "make current opcode conditional (zero)",
 		"wao", " jnz", "make current opcode conditional (not zero)",
 		"wao", " ret1", "make the current opcode return 1",
@@ -35,6 +36,8 @@ R_API bool r_core_hack_arm64(RCore *core, const char *op, const RAnalOp *analop)
 	} else if (!strcmp (op, "jz")) {
 		eprintf ("ARM jz hack not supported\n");
 		return false;
+	} else if (!strcmp (op, "jinf")) {
+		r_core_cmdf (core, "wx 00000014");
 	} else if (!strcmp (op, "jnz")) {
 		eprintf ("ARM jnz hack not supported\n");
 		return false;
@@ -82,6 +85,8 @@ R_API bool r_core_hack_arm(RCore *core, const char *op, const RAnalOp *analop) {
 		str[len*2] = '\0';
 		r_core_cmdf (core, "wx %s\n", str);
 		free (str);
+	} else if (!strcmp (op, "jinf")) {
+		r_core_cmdf (core, "wx %s\n", (bits==16)? "fee7": "feffffea");
 	} else if (!strcmp (op, "trap")) {
 		const char* trapcode = (bits==16)? "bebe": "fedeffe7";
 		r_core_cmdf (core, "wx %s\n", trapcode);
@@ -199,6 +204,8 @@ R_API bool r_core_hack_x86(RCore *core, const char *op, const RAnalOp *analop) {
 			eprintf ("Current opcode is not conditional\n");
 			return false;
 		}
+	} else if (!strcmp (op, "jinf")) {
+		r_core_cmd0 (core, "wx ebfe\n");
 	} else if (!strcmp (op, "jnz")) {
 		if (b[0] == 0x74) {
 			r_core_cmd0 (core, "wx 75\n");