From 0f52c02435b9861b9e7c4d46c2d8705408ea8aeb Mon Sep 17 00:00:00 2001
From: antifallobst <antifallobst@systemausfall.org>
Date: Thu, 20 Apr 2023 23:16:17 +0200
Subject: [PATCH] feature (build system): setup a build system

---
 .gitignore          |  2 ++
 CMakeLists.txt      | 25 ++++++++++++++++++++++
 build.sh            | 52 +++++++++++++++++++++++++++++++++++++++++++++
 src/asm/syscall.asm | 18 ++++++++++++++++
 src/libc.c          |  1 +
 5 files changed, 98 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100755 build.sh
 create mode 100644 src/asm/syscall.asm
 create mode 100644 src/libc.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8ccba53
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+cmake-build-debug
+build
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..7ad14b4
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.00)
+project(libc)
+set(C 99)
+
+set(CMAKE_NASM_COMPILE_OBJECT "nasm <INCLUDES> <FLAGS> -o <OBJECT> <SOURCE>")
+
+
+add_library(libc)
+add_library(libc_asm OBJECT)
+target_include_directories(libc PRIVATE inc)
+file(GLOB_RECURSE libc_src_c   "src/**/*.c")
+file(GLOB_RECURSE libc_inc     "inc/**/*.h")
+file(GLOB_RECURSE libc_src_asm "src/**/*.asm")
+
+
+target_compile_options(libc PRIVATE "-g -fno-stack-protector -fno-stack-check -ffreestanding -m64 -march=x86-64 -mabi=sysv")
+target_link_options(libc PRIVATE "-Bsymbolic -nostdlib -shared -fno-stack-protector")
+
+enable_language(ASM_NASM)
+set(CAN_USE_ASSEMBLER TRUE)
+set_target_properties(libc PROPERTIES PREFIX "")
+set_target_properties(libc PROPERTIES SUFFIX ".so")
+
+target_sources(libc_asm PRIVATE ${libc_src_asm})
+target_sources(libc     PRIVATE ${libc_src_c} ${libc_inc} $<TARGET_OBJECTS:libc_asm>)
\ No newline at end of file
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..c526dd2
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,52 @@
+#!/usr/bin/bash
+
+# This file is part of noxos and licensed under the MIT open source license
+
+set -e
+
+workspace_setup() {
+    echo "  --> Setting up workspace"
+    mkdir -pv build
+    mkdir -pv build/cmake
+    echo ""
+}
+
+check_toolchain() {
+  echo "  --> Checking Toolchain"
+  hash gcc
+  echo "   |--> found gcc"
+  hash ld
+  echo "   |--> found ld"
+  hash nasm
+  echo "   |--> found nasm"
+  hash cmake
+  echo "   |--> found cmake"
+
+  echo "  --> All checks passed"
+}
+
+
+libc_build() {
+    echo "  --> Building the noxos standard library"
+    cd build/cmake
+    cmake -S ../.. -B .
+    make
+    cd ../..
+    echo ""
+}
+
+
+echo "!=====[ NoxOS libc build script ]=====!"
+
+case $1 in
+    "check")
+        check_toolchain
+        ;;
+    *)
+        workspace_setup
+        libc_build
+        ;;
+esac
+
+echo "!=====[ Finished ]=====!"
+
diff --git a/src/asm/syscall.asm b/src/asm/syscall.asm
new file mode 100644
index 0000000..ea15ccc
--- /dev/null
+++ b/src/asm/syscall.asm
@@ -0,0 +1,18 @@
+; This file is part of noxos and licensed under the MIT open source license
+
+syscall_perform:
+    ; set the interrupt ID
+    mov rax, rdi
+
+    ; set the arguments
+    mov rdi, rsi
+    mov rsi, rdx
+    mov rdx, rcx
+    mov rcx, r8
+
+    int 0x80
+
+    ; the return value is already set in RAX
+
+    ret
+GLOBAL syscall_perform
\ No newline at end of file
diff --git a/src/libc.c b/src/libc.c
new file mode 100644
index 0000000..b92bff6
--- /dev/null
+++ b/src/libc.c
@@ -0,0 +1 @@
+// This file is part of noxos and licensed under the MIT open source license