From e582f2e63b87bf2dfa1b832c3d7342b7b6ef4a66 Mon Sep 17 00:00:00 2001
From: Alan Jian <alanjian85@outlook.com>
Date: Wed, 24 Jul 2024 16:52:13 +0800
Subject: [PATCH] feat: add linker script

---
 CMakeLists.txt |  4 ++--
 linker.ld      | 37 +++++++++++++++++++++++++++++++++++++
 src/init.c     |  7 +++----
 src/main.c     |  6 ------
 4 files changed, 42 insertions(+), 12 deletions(-)
 create mode 100644 linker.ld
 delete mode 100644 src/main.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 34e4174..deb858e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.29)
 project(init C)
 
-add_library(init
+add_executable(init
     src/banner.c
     src/cmd.c
     src/cmds/banner.c
@@ -14,7 +14,6 @@ add_library(init
     src/cmds/shutdown.c
     src/cmds/sleep.c
     src/init.c
-    src/main.c
     src/shell.c
 )
 
@@ -24,6 +23,7 @@ target_compile_options(init PRIVATE
     -mcmodel=medany
     -Wall
 )
+target_link_options(init PRIVATE -nostdlib -T ${PROJECT_SOURCE_DIR}/linker.ld)
 target_include_directories(init PRIVATE
     ${LIBC_INCLUDE}
     ${LUA_INCLUDE}
diff --git a/linker.ld b/linker.ld
new file mode 100644
index 0000000..23ea08f
--- /dev/null
+++ b/linker.ld
@@ -0,0 +1,37 @@
+#include <config.h>
+
+ENTRY(_start)
+SECTIONS {
+    . = 0x84000000;
+
+    .text : {
+        *(.text .text.*)
+    }
+
+    . = ALIGN(4K);
+    .rodata : {
+        *(.rodata .rodata.*)
+    }
+
+    . = ALIGN(4K);
+    .data : {
+        *(.data .data.*)
+    }
+
+    .sdata : {
+        *(.sdata .sdata.*)
+    }
+
+    . = ALIGN(8);
+    PROVIDE(__bss_start = .);
+
+    .sbss : {
+        *(.sbss .sbss.*)
+    }
+
+    .bss : {
+        *(.bss .bss.*)
+    }
+
+    PROVIDE(_end = .);
+}
diff --git a/src/init.c b/src/init.c
index 0a048c2..3638b57 100644
--- a/src/init.c
+++ b/src/init.c
@@ -2,18 +2,17 @@
 #include <errno.h>
 #include <proc.h>
 #include <reboot.h>
+#include <shell.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/wait.h>
 
-void start();
-
-void init(void) {
+int main(void) {
     printf("Booting up CargOS v%d.%d.%d...\n", VERSION_MAJOR, VERSION_MINOR,
            VERSION_PATCH);
 
     const char *argv[] = {"shell", nullptr};
-    proc(start, argv);
+    proc(shell, argv);
 
     while (true) {
         if (wait(nullptr) < 0 && errno == ECHILD) {
diff --git a/src/main.c b/src/main.c
deleted file mode 100644
index f3f6c17..0000000
--- a/src/main.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <shell.h>
-
-int main() {
-    shell();
-    return 0;
-}