3 files changed, 92 insertions, 0 deletions

diff --git a/aarch64/kusswurm_ch11.S b/aarch64/kusswurm_ch11.S
new file mode 100644
index 0000000..0407e92
--- /dev/null
+++ b/aarch64/kusswurm_ch11.S
@@ -0,0 +1,65 @@
+// ================================================================================================
+// Code written while reading chapter 11 of Modern Arm Assembly Language Programming
+//
+// 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.S"
+
+TEXT_SEGMENT
+
+// example 1
+
+.global SYM(i32_add_sub)
+.global SYM(i64_add_sub)
+
+SYM(i32_add_sub):
+    // w0: a
+    // w1: b
+    // w2: c
+#if 0
+    add w3, w0, w1
+    sub w0, w3, w2
+#else
+    add w0, w0, w1
+    sub w0, w0, w2
+#endif
+    // w0: return
+    ret
+
+SYM(i64_add_sub):
+    // x0: a
+    // x1: b
+    // x2: c
+    add x3, x0, x1
+    sub x0, x3, x2
+    // x0: return
+    ret
+
+// example 2
+
+.global SYM(i32_mul)
+.global SYM(i32_mul_safe)
+
+SYM(i32_mul):
+    // w0: a
+    // w1: b
+    mul w0, w0, w1
+    // w0: return
+    ret
+
+SYM(i32_mul_safe):
+    // w0: a
+    // w1: b
+    smull x0, w0, w1
+    // x0: ret
+    ret
+
diff --git a/aarch64/kusswurm_ch11.c b/aarch64/kusswurm_ch11.c
new file mode 100644
index 0000000..4edfba0
--- /dev/null
+++ b/aarch64/kusswurm_ch11.c
@@ -0,0 +1,26 @@
+#include <stdint.h>
+#include <stdio.h>
+
+// example 1
+int32_t i32_add_sub(int32_t a, int32_t b, int32_t c);
+int64_t i64_add_sub(int64_t a, int64_t b, int64_t c);
+
+// example 2
+int32_t i32_mul(int32_t a, int32_t b);
+int64_t i32_mul_safe(int32_t a, int32_t b);
+
+#define PRINT_LOG(FMT, CODE) printf(#CODE ": " FMT "\n", CODE)
+
+int main(int argc, const char* argv[])
+{
+    // example 1
+    PRINT_LOG("%d", i32_add_sub(5, 3, 1));
+    PRINT_LOG("%lld", i64_add_sub(5, 3, 1));
+
+    // example 2
+    PRINT_LOG("%d", i32_mul(5, 6));
+    PRINT_LOG("%d", i32_mul(2000000000, 4));
+    PRINT_LOG("%lld", i32_mul_safe(5, 6));
+    PRINT_LOG("%lld", i32_mul_safe(2000000000, 4));
+}
+
diff --git a/aarch64/meson.build b/aarch64/meson.build
index aea3a3f..c664858 100644
--- a/aarch64/meson.build
+++ b/aarch64/meson.build
@@ -1,4 +1,5 @@
 project('aarch64', 'c')
 
+executable('kusswurm_ch11', [ 'kusswurm_ch11.c', 'kusswurm_ch11.S' ])
 executable('mariokartwii_ch07', 'mariokartwii_ch07.S')
 executable('mariokartwii_ch08', 'mariokartwii_ch08.S')