feat(sdb): support sdb

npc/utils/sdb/addrexp.y

@@ -0,0 +1,58 @@
+%code requires {
+    #include <types.h>
+    #include <stdio.h>
+    #include <stdlib.h>
+    extern int yylex(void);
+}
+%{
+    #include <types.h>
+    #include <stdio.h>
+    #include <stdlib.h>
+    void yyerror(word_t *result, const char *err) {
+      fprintf(stderr, "%s", err);
+    }
+    int pmem_read(int raddr);
+%}
+
+%token NUMBER HEX_NUMBER
+%token REGISTER
+%locations
+%start input
+%define api.value.type { word_t }
+%parse-param { uint32_t *result }
+%left '-' '+'
+%left '*' '/'
+
+%%
+input
+    : expression { *result = $1; }
+    ;
+
+expression
+    : number { $$ = $1; }
+    | expression '>' '=' expression { $$ = ($1 >= $4); }
+    | expression '<' '=' expression { $$ = ($1 <= $4); }
+    | expression '=' '=' expression { $$ = ($1 == $4); }
+    | expression '!' '=' expression { $$ = ($1 == $4); }
+    | expression '>' expression { $$ = ($1 > $3); }
+    | expression '<' expression { $$ = ($1 < $3); }
+    | expression '+' expression { $$ = $1 + $3; }
+    | expression '-' expression { $$ = $1 - $3; }
+    | expression '*' expression { $$ = $1 * $3; }
+    | expression '/' expression {
+        if($3 == 0) {
+          fprintf(stderr, "Error: divide by zero at" FMT_WORD " / " FMT_WORD "\n", $1, $3);
+          YYABORT;
+        };
+        $$ = $1 / $3;
+      }
+    | '-' number { $$ = -$2; }
+    | '*' expression { $$ = pmem_read($2); }
+    | '(' expression ')' { $$ = $2; }
+
+number
+    : REGISTER
+    | NUMBER
+    | HEX_NUMBER
+
+%%