Move generic start code and memset into arch/generic.h

arch/aarch64.c

@@ -1,6 +1,8 @@
 #if defined(__aarch64__)
 #include "../int.h"
 
+#include "generic.h"
+
 void exit(int8_t status){
   asm ( "mov x0, %0\n"        // Move the exit status into register x0
         "mov x8, #93\n"       // Syscall number for 'exit' is 93 in AArch64

arch/generic.h

@@ -0,0 +1,31 @@
+/*
+ * This file is not meant to be included by user applications
+ * It contains generic arch agnostic implementations of helper functions
+ * and start code that can be included in <arch>.c when an architecture
+ * specific version is not nessisary.
+ *
+ * Copyright (c) 2025 Lucas Schumacher. All Rights Reserved.
+ */
+
+#ifndef MEMSET_DEFINED
+#define MEMSET_DEFINED
+// Generic memset implementation
+void *memset(void* s, int c, unsigned long n) {
+  int8_t* mem = s;
+  for(long int i = 0; i < n; ++i) mem[i] = c;
+  return s;
+}
+#endif // !MEMSET_DEFINED
+
+#ifndef _START_DEFINED
+#define _START_DEFINED
+// Generic _start implementation. Can't access any args
+extern void exit(int8_t status);
+extern int main(int argc, char** argv);
+void _start() {
+  exit(main(0, 0));
+}
+void __start() {
+  exit(main(0, 0));
+}
+#endif // !_START_DEFINED

arch/mips.c

@@ -1,6 +1,8 @@
 #if defined(__mips__)
 #include "../int.h"
 
+#include "generic.h"
+
 void exit(int8_t status){
   asm ( 
     "move $a0, %0\n"

arch/x86_64.c

@@ -1,6 +1,8 @@
 #if defined(__x86_64__)
 #include "../int.h"
 
+#include "generic.h"
+
 #define SYS_EXIT 60
 void exit(int8_t status) {
   asm volatile(

buildtest.c

@@ -60,13 +60,3 @@ int main() {
 
   return 69;
 }
-
-void __libc_start_main() {exit(main());}
-
-void _start() {
-  __libc_start_main();
-}
-
-void __start() {
-  _start();
-}

socktest.c

@@ -25,7 +25,7 @@ int main() {
 
 	// Set socket options
 	int opt = 1;
-	if(0 > setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(optlen))) {
+	if(0 > setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) {
 		write(STDERR, "Socket error\n", 13);
 		close(socket_fd);
 		return 2;
@@ -89,10 +89,3 @@ int main() {
 	close(socket_fd);
 	return 0;
 }
-
-void _start() {
-  exit(main());
-}
-void __start() {
-  exit(main());
-}

sys.h

@@ -142,11 +142,6 @@ int clock_nanosleep(clockid_t clockid, int flags, const struct timespec *t, stru
 
 uint32_t fork();
 
-// Provide memset for clang
-// TODO: move this (and start code?) to separate .c file
-void *memset(void* s, int c, unsigned long n) {
-  int8_t* mem = s;
-  for(long int i = 0; i < n; ++i) mem[i] = c;
-  return s;
-}
+void *memset(void* s, int c, unsigned long n);
+
 #endif // !MINIMALSYS_H