[USER] Init libc with arguments and environment

MESS - execve - Clean up and move earlier

libc/crt0.S

@@ -13,10 +13,12 @@
 
   call _init
 
-  pop rdi
   pop rsi
+  pop rdx
+  movabs rax, offset main
+  mov rdi, rax
 
-  call main
+  call __libc_start_main
 
   call _fini
 

libc/syscalls.c

@@ -46,8 +46,3 @@ long __syscall_common(long num, ...)
   while(1);
   return 0;
 }
-
-struct pthread *__pthread_self()
-{
-  return 0;
-}

libc/thread.c

@@ -0,0 +1,21 @@
+#include "syscalls.h"
+
+struct pthread *__pt;
+
+struct pthread *__pthread_self()
+{
+  return __pt;
+}
+
+SYSCALL_DEF(set_thread_area)
+{
+  SYSCALL_INIT(void *, ptr);
+  __pt = ptr;
+  return 0;
+}
+
+SYSCALL_DEF(set_tid_address)
+{
+  SYSCALL_INIT();
+  return 0;
+}