init commit

crt/crt1.c

@@ -0,0 +1,32 @@
+/* Minimal C runtime — entry point before main.
+ *
+ * Elyz process startup:
+ *   the loader transfers control here with an initial capability wallet
+ *   (CNode) and a pool of untyped memory.  No traditional syscalls exist;
+ *   all kernel interaction goes through capability invocation.
+ *
+ * Current state: STUB — the kernel ABI is under construction.
+ *   - argc/argv passed on stack (convention inherited from limine boot)
+ *   - initial memory pool not yet wired; __libc_init sets up a tiny bump
+ *     arena for development.
+ */
+
+void _start(void)
+{
+    extern int main(int, char **, char **);
+    extern void __libc_init(void);
+
+    register long *args __asm__("rsp");
+    int    argc = (int)args[0];
+    char **argv = (char **)(args + 1);
+    char **envp = argv + argc + 1;
+
+    __libc_init();
+
+    int ret = main(argc, argv, envp);
+
+    /* No _exit syscall in Elyz — send an Exit message to the PM actor.
+     * For now: infinite halt. */
+    for (;;) __asm__ volatile("hlt");
+    (void)ret;
+}