feat(sdb): support sdb

npc/utils/sdb/addrexp.l

@@ -0,0 +1,26 @@
+%{
+    #include <types.h>
+    #include <stdbool.h>
+    #include "addrexp.h"
+    static bool success = false;
+    void yyerror(word_t *result, const char *err);
+    word_t reg_str2val(const char *name, bool*);
+%}
+%option noyywrap
+
+%%
+
+0[xX][0-9a-fA-F]+ { yylval = strtoul(yytext, NULL, 16); return HEX_NUMBER; }
+[0-9]+            { yylval = strtoul(yytext, NULL, 10); return NUMBER; }
+$[asgprt$][0-9pa][0-9]?    {
+    yylval = reg_str2val(yytext + 1, &success);
+    if(!success) {
+        yyerror(NULL, "Failed to convert reg to value");
+        return YYerror;
+    }
+    return REGISTER;
+}
+[+\-*/<=()]         { return *yytext; }
+[ \t]             {  }
+.                 { printf("Unexpected character: %s\n", yytext); return YYerror; }
+%%