Merge branch 'symtab'

1 files changed, 49 insertions, 0 deletions

diff --git a/kern/symbol.c b/kern/symbol.c
new file mode 100644
index 00000000..30df091e
--- /dev/null
+++ b/kern/symbol.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018 Agustina Arzille.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <kern/macros.h>
+#include <kern/symbol.h>
+
+const size_t symbol_table_size __weak;
+const struct symbol *symbol_table_ptr __weak;
+
+const struct symbol *
+symbol_lookup(uintptr_t addr)
+{
+    const struct symbol *symbol;
+    uintptr_t start, end;
+
+    for (size_t i = 0; i < symbol_table_size; i++) {
+        symbol = &symbol_table_ptr[i];
+
+        if (!symbol->name || (symbol->size == 0)) {
+            continue;
+        }
+
+        start = symbol->addr;
+        end = symbol->addr + symbol->size;
+
+        if ((addr >= start) && (addr < end)) {
+            return symbol;
+        }
+    }
+
+    return NULL;
+}