From 1f8f4e05410df148b7f3c3fd35f85c9b37d0401f Mon Sep 17 00:00:00 2001
From: Dario Bartussek <d.bartussek@gmail.com>
Date: Mon, 19 Apr 2021 13:50:42 +0200
Subject: Simple hello world program using libctru

---
 .gitignore  |  2 ++
 Cargo.toml  |  7 ++++---
 build.rs    |  7 -------
 compile.sh  |  6 ++++--
 package.sh  |  2 +-
 src/lib.rs  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs | 18 ------------------
 src/start.s | 22 ----------------------
 8 files changed, 57 insertions(+), 53 deletions(-)
 delete mode 100644 build.rs
 create mode 100644 src/lib.rs
 delete mode 100644 src/main.rs
 delete mode 100644 src/start.s

diff --git a/.gitignore b/.gitignore
index 4278b3b..d41151c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@
 
 Cargo.lock
 
+rust_3ds.elf
+
 rust_3ds.map
 rust_3ds.s
 
diff --git a/Cargo.toml b/Cargo.toml
index 4d2f3dd..e2fa275 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,9 @@ authors = ["Dario Bartussek <d.bartussek@gmail.com>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"
 
+[lib]
+crate-type = ["staticlib"]
+
 [profile.dev]
 panic = "abort"
 opt-level = "s"
@@ -13,7 +16,5 @@ opt-level = "s"
 panic = "abort"
 opt-level = "s"
 
-[build-dependencies]
-cc = "1.0.67"
-
 [dependencies]
+libctru = { git = "https://github.com/dbartussek/libctru-rs.git" }
diff --git a/build.rs b/build.rs
deleted file mode 100644
index 5a33378..0000000
--- a/build.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-fn main() {
-    cc::Build::new()
-        .target("arm-none-eabihf")
-        .compiler("clang")
-        .file("src/start.s")
-        .compile("start");
-}
diff --git a/compile.sh b/compile.sh
index ac7ae71..c47a7b4 100755
--- a/compile.sh
+++ b/compile.sh
@@ -1,5 +1,7 @@
 cargo fmt
 
-RUSTFLAGS="-C link-args=-T3dsx.ld -C link-args=-Map=rust_3ds.map" cargo xbuild --target 3ds.json
+cargo xbuild --target 3ds.json
 
-llvm-objdump -d -C target/3ds/debug/rust_3ds > rust_3ds.s
+arm-none-eabi-gcc -specs=3dsx.specs -g -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft -Wl,-Map,rust_3ds.map -Ltarget/3ds/debug  -LC:/devkitpro/libctru/lib -lrust_3ds -lctru -lm -o rust_3ds.elf
+
+llvm-objdump -d -C rust_3ds.elf > rust_3ds.s
diff --git a/package.sh b/package.sh
index 0446af3..b0f7221 100755
--- a/package.sh
+++ b/package.sh
@@ -1,4 +1,4 @@
 . compile.sh
 
 smdhtool --create "rust_3ds" "Description" "Author" "./icon.png" rust_3ds.smdh
-3dsxtool ./target/3ds/debug/rust_3ds rust_3ds.3dsx --smdh=rust_3ds.smdh
+3dsxtool ./rust_3ds.elf rust_3ds.3dsx --smdh=rust_3ds.smdh
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..1970dfd
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,46 @@
+#![no_std]
+
+use core::{panic::PanicInfo, ptr::null_mut};
+use libctru::raw::{
+    aptMainLoop, c_char, c_int, consoleInit, gfxExit, gfxFlushBuffers, gfxInitDefault,
+    gfxScreen_t_GFX_TOP, gfxSwapBuffers, gspWaitForEvent, hidKeysDown, hidScanInput,
+    GSPGPU_Event_GSPGPU_EVENT_VBlank0, KEY_START,
+};
+
+extern "C" {
+    fn puts(string: *const c_char);
+}
+
+#[no_mangle]
+pub extern "C" fn main(_argc: c_int, _argv: *const *const c_char) -> c_int {
+    unsafe {
+        gfxInitDefault();
+
+        consoleInit(gfxScreen_t_GFX_TOP, null_mut());
+
+        puts("Hello World from Rust".as_ptr());
+
+        while aptMainLoop() {
+            hidScanInput();
+            let keys = hidKeysDown();
+
+            if keys & (KEY_START as u32) != 0 {
+                break;
+            }
+
+            gfxFlushBuffers();
+            gfxSwapBuffers();
+
+            gspWaitForEvent(GSPGPU_Event_GSPGPU_EVENT_VBlank0, true);
+        }
+
+        gfxExit();
+    }
+
+    0
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index 6133bfd..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-#![feature(asm)]
-#![no_std]
-#![no_main]
-
-use core::panic::PanicInfo;
-
-#[no_mangle]
-pub extern "C" fn pre_main() -> ! {
-    unsafe {
-        core::ptr::null::<usize>().read_volatile();
-    }
-    loop {}
-}
-
-#[panic_handler]
-fn panic(_info: &PanicInfo) -> ! {
-    loop {}
-}
diff --git a/src/start.s b/src/start.s
deleted file mode 100644
index 158feef..0000000
--- a/src/start.s
+++ /dev/null
@@ -1,22 +0,0 @@
-.cpu mpcore
-.section ".crt0","ax"
-
-.align 2
-.arm
-
-_start:
-    b pre_main
-
-.ascii "_prm"
-__service_ptr:
-    .word 0
-__apt_appid:
-    .word 0x300
-__heap_size:
-    .word 24*1024*1024
-__linear_heap_size:
-	.word 32*1024*1024
-__system_arglist:
-    .word 0
-__system_runflags:
-	.word 0
-- 
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