From 350776d5d1ff25789b90f5a2282042ed4c93a552 Mon Sep 17 00:00:00 2001
From: hwacha <i@hwacha.ru>
Date: Mon, 20 Apr 2026 21:30:23 +0900
Subject: [PATCH] fix: added arc4random_buf stub this fixes linking error on
 aarch64 also _seralPutchar was made public to prevent mangling

---
 Kernel/Source/IO/uart.swift   | 5 +++--
 Kernel/Source/Support/stubs.c | 6 ++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Kernel/Source/IO/uart.swift b/Kernel/Source/IO/uart.swift
index 2bd7dfd..3d9107f 100644
--- a/Kernel/Source/IO/uart.swift
+++ b/Kernel/Source/IO/uart.swift
@@ -1,7 +1,8 @@
 let kUARTBaseAddress: UInt = 0x09000000 // TODO: Make it dynamic by parsion DTB
 
 @_cdecl("putchar")
-@discardableResult func _serialPutchar(_ char: Int32) -> Int32 {
+@discardableResult
+public func _serialPutchar(_ char: Int32) -> Int32 {
     let uartFR: UInt = kUARTBaseAddress + 0x18// TXFF -- TRansmit FIFO Full for PL011 is 5 bit of FR reg (0x18)
 
     while (mmio_read32(uartFR) & (1 << 5)) != 0 {
@@ -16,4 +17,4 @@ public func kprint(_ message: StaticString) {
     for i in 0..<message.utf8CodeUnitCount {
         _serialPutchar(Int32(message.utf8Start[i]))
     }
-}
\ No newline at end of file
+}
diff --git a/Kernel/Source/Support/stubs.c b/Kernel/Source/Support/stubs.c
index 75e3e24..ca96b13 100644
--- a/Kernel/Source/Support/stubs.c
+++ b/Kernel/Source/Support/stubs.c
@@ -34,3 +34,9 @@ int posix_memalign(void** ptr, unsigned long align, unsigned long size) {
 }
 
 void free(void* ptr) { (void)ptr; }
+
+// Swift stdlib uses arc4random_buf for Hasher seed — stub with zeroes in bare-metal
+void arc4random_buf(void* buf, unsigned long nbytes) {
+    unsigned char* b = (unsigned char*)buf;
+    while (nbytes--) *b++ = 0;
+}