Implement linkerscript parser

Signed-off-by: AntonioND <antonio_nd@outlook.com>
2025-11-25 04:22:07 +00:00 · 2017-03-20 23:13:29 +00:00
parent dfb99618f5
commit 22d4a10cb6
9 changed files with 527 additions and 1 deletions
--- a/src/link/parser.y
+++ b/src/link/parser.y
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+%{
+#include <stdio.h>
+
+#include "extern/err.h"
+#include "link/script.h"
+
+int yylex();
+void yyerror(char *);
+
+static int nline = 1;
+%}
+
+%union { int i; char s[512]; }
+
+%token<i> INTEGER
+%token<s> STRING
+
+%token<s> SECTION_NONBANKED
+%token<s> SECTION_BANKED
+
+%token COMMAND_ALIGN
+%token COMMAND_ORG
+
+%token NEWLINE
+
+%start lines
+
+%%
+
+lines:
+      /* empty */
+    | lines line NEWLINE
+    ;
+
+line:
+      /* empty */       { nline++; }
+    | statement         { nline++; }
+    ;
+
+statement:
+    /* Statements to set the current section */
+      SECTION_NONBANKED {
+        script_SetCurrentSectionType($1, 0);
+    }
+    | SECTION_NONBANKED INTEGER {
+        errx(1, "%d:Trying to assign a bank to a non-banked section.\n", nline);
+    }
+
+    | SECTION_BANKED {
+        errx(1, "%d:Banked section without assigned bank.\n", nline);
+    }
+    | SECTION_BANKED INTEGER {
+        script_SetCurrentSectionType($1, $2);
+    }
+
+    /* Commands to adjust the address inside the current section */
+    | COMMAND_ALIGN INTEGER {
+        script_SetAlignment($2);
+    }
+    | COMMAND_ALIGN {
+        errx(1, "%d:ALIGN keyword needs an argument.\n", nline);
+    }
+    | COMMAND_ORG INTEGER {
+        script_SetAddress($2);
+    }
+    | COMMAND_ORG {
+        errx(1, "%d:ORG keyword needs an argument.\n", nline);
+    }
+
+    /* Section name */
+    | STRING {
+        script_OutputSection($1);
+    }
+
+    /* End */
+    ;
+
+%%
+
+extern int yylex();
+extern int yyparse();
+
+extern FILE *yyin;
+
+void yyerror(char *s)
+{
+    errx(1, "%d:Linkerscript parse error: \"%s\"\n", nline, s);
+}
+
+void script_Parse(const char *path)
+{
+    script_InitSections();
+
+    FILE *f = fopen(path, "r");
+
+    if (!f)
+        errx(1, "Error opening file! \"%s\"\n", path);
+
+    yyin = f;
+
+    do {
+        yyparse();
+    } while (!feof(yyin));
+
+    fclose(f);
+}
+