From 9d3030763b002989135b4595a143ae9c2af793d5 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Mon, 19 Sep 2022 20:54:05 +0200
Subject: [PATCH] We can fetch a symbol's name from its address!!

---
 kernel/include/trace/Resolve.h |  4 ++++
 kernel/src/trace/Resolve.cpp   | 38 ++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 kernel/include/trace/Resolve.h
 create mode 100644 kernel/src/trace/Resolve.cpp

diff --git a/kernel/include/trace/Resolve.h b/kernel/include/trace/Resolve.h
new file mode 100644
index 00000000..3cb35921
--- /dev/null
+++ b/kernel/include/trace/Resolve.h
@@ -0,0 +1,4 @@
+#pragma once
+#include <stdint.h>
+
+void get_symbol_name(uintptr_t address, char* buffer);
\ No newline at end of file
diff --git a/kernel/src/trace/Resolve.cpp b/kernel/src/trace/Resolve.cpp
new file mode 100644
index 00000000..23e1f0cb
--- /dev/null
+++ b/kernel/src/trace/Resolve.cpp
@@ -0,0 +1,38 @@
+#include "trace/Resolve.h"
+#include "init/InitRD.h"
+#include "std/stdlib.h"
+#include "std/string.h"
+#include <stddef.h>
+
+extern int kernel_start;
+extern int kernel_end;
+
+static InitRD::File symbol_map = {"", 0, 0, 0};
+
+static size_t symbol_strlen(const char* symbol)
+{
+    const char* i = symbol;
+    for (; *i != '\n'; ++i)
+        ;
+    return (i - symbol);
+}
+
+void get_symbol_name(uintptr_t address, char* buffer)
+{
+    if (!symbol_map.addr) { symbol_map = InitRD::open("sys/moon.sym"); }
+    while (address >= (uintptr_t)&kernel_start && address <= (uintptr_t)&kernel_end)
+    {
+        char addr_as_str[60];
+        ultoa(address, addr_as_str, 16);
+        char* symbol = strstr((char*)symbol_map.addr, addr_as_str);
+        if (symbol)
+        {
+            symbol += 19;
+            size_t symlen = symbol_strlen(symbol);
+            memcpy(buffer, symbol, symlen);
+            buffer[symlen] = 0;
+            return;
+        }
+        address--;
+    }
+}
\ No newline at end of file