libc: runtime: add more required runtime objects

lib/libc/runtime/x86_64/Scrt1.s

@@ -0,0 +1,22 @@
+.code64
+
+.global _start
+.type _start, @function
+
+.extern __libc_init
+.type __libc_init, @function
+
+_start:
+	# %rdi: (struct rosetta_bootstrap *)bs_info
+	mov %rdi, %rbx
+	call __libc_init
+
+	mov 0(%rbx), %rdi # argc
+	mov 8(%rbx), %rsi # argv
+	mov 24(%rbx), %rdx # envp
+	call main
+
+	mov %rax, %rdi
+	mov $9, %rax
+	syscall
+1:	jmp 1b

lib/libc/runtime/x86_64/crt0.s

@@ -1,24 +1 @@
 .code64
-
-.global _start
-.type _start, @function
-
-.extern __libc_init
-.type __libc_init, @function
-
-.extern task_exit
-.type task_exit, @function
-
-_start:
-	# %rdi: (struct rosetta_bootstrap *)bs_info
-	mov %rdi, %rbx
-	call __libc_init
-
-	mov 0(%rbx), %rdi # argc
-	mov 8(%rbx), %rsi # argv
-	mov 24(%rbx), %rdx # envp
-	call main
-
-	mov %rax, %rdi
-	call task_exit
-1:	jmp 1b

lib/libc/runtime/x86_64/crt1.s

@@ -0,0 +1,22 @@
+.code64
+
+.global _start
+.type _start, @function
+
+.extern __libc_init
+.type __libc_init, @function
+
+_start:
+	# %rdi: (struct rosetta_bootstrap *)bs_info
+	mov %rdi, %rbx
+	call __libc_init
+
+	mov 0(%rbx), %rdi # argc
+	mov 8(%rbx), %rsi # argv
+	mov 24(%rbx), %rdx # envp
+	call main
+
+	mov %rax, %rdi
+	mov $9, %rax
+	syscall
+1:	jmp 1b

lib/libc/runtime/x86_64/crtbeginS.s

@@ -0,0 +1,7 @@
+.code64
+
+.global _crtbeginS
+.type _crtbeginS, @function
+
+_crtbeginS:
+	ret

lib/libc/runtime/x86_64/crtendS.s

@@ -0,0 +1,7 @@
+.code64
+
+.global _crtendS
+.type _crtendS, @function
+
+_crtendS:
+	ret