2 files changed, 82 insertions, 0 deletions
diff --git a/rust/asm/src/main.rs b/rust/asm/src/main.rs
new file mode 100644
index 0000000..33adc16
--- /dev/null
+++ b/rust/asm/src/main.rs
@@ -0,0 +1,46 @@
+// ================================================================================================
+// Rust->assembly interop demo
+//
+// License:
+//     SPDX-License-Identifier: 0BSD
+//     Copyright (c) 2026 Hunter Kvalevog
+//
+//     Permission to use, copy, modify, and/or distribute this software for any
+//     purpose with or without fee is hereby granted.
+//
+//     THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+//     WITH REGARD TO THIS SOFTWARE.
+// ================================================================================================
+
+#[repr(C)]
+struct Vec3 {
+    x: f32,
+    y: f32,
+    z: f32,
+}
+
+impl Vec3 {
+    pub fn new(x: f32, y: f32, z: f32) -> Self {
+        Self { x, y, z }
+    }
+}
+
+unsafe extern "C" {
+    fn add_u32(a: u32, b: u32) -> u32;
+    fn dot_f32v3(a: *const Vec3, b: *const Vec3) -> f32;
+}
+
+fn test_add(a: u32, b: u32) {
+    let r = unsafe { add_u32(a, b) };
+    println!("{a} + {b} = {r}");
+}
+
+fn test_dot(a: &Vec3, b: &Vec3) {
+    let r = unsafe { dot_f32v3(a, b) };
+    println!("[{}, {}, {}] ⋅ [{}, {}, {}] = {}", a.x, a.y, a.z, b.x, b.y, b.z, r);
+}
+
+fn main() {
+    test_add(1, 2);
+    test_dot(&Vec3::new(1.0, 2.0, 3.0), &Vec3::new(4.0, 5.0, 6.0));
+}
diff --git a/rust/asm/src/main_aarch64.S b/rust/asm/src/main_aarch64.S
new file mode 100644
index 0000000..d8add76
--- /dev/null
+++ b/rust/asm/src/main_aarch64.S
@@ -0,0 +1,36 @@
+// ================================================================================================
+// Rust->assembly interop demo
+//
+// License:
+//     SPDX-License-Identifier: 0BSD
+//     Copyright (c) 2026 Hunter Kvalevog
+//
+//     Permission to use, copy, modify, and/or distribute this software for any
+//     purpose with or without fee is hereby granted.
+//
+//     THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+//     WITH REGARD TO THIS SOFTWARE.
+// ================================================================================================
+
+#include "../../../_common/aarch64/common.S"
+
+TEXT_SEGMENT
+
+.global SYM(add_u32)
+.global SYM(dot_f32v3)
+
+SYM(add_u32):
+    add w0, w0, w1
+    ret
+
+SYM(dot_f32v3):
+    ldp s1, s2, [x0]            // a.x, a.y
+    ldp s3, s4, [x1]            // b.x, b.y
+    ldr s5, [x0, #8]            // a.z
+    ldr s6, [x1, #8]            // b.z
+
+    fmul  s0, s1, s3            // a.x * b.x
+    fmadd s0, s2, s4, s0        // + a.y * b.y
+    fmadd s0, s5, s6, s0        // + a.z * b.z
+    
+    ret