stage1 修复bug 删除递归测试

stage0/spl_syscall.c

@@ -118,6 +118,10 @@ static spl_val_t vm_fsize(int nargs, spl_val_t *args) {
     return (spl_val_t)(uintptr_t)sz;
 }
 
+SYSCALL_0(vm_stdin, stdin)
+SYSCALL_0(vm_stdout, stdout)
+SYSCALL_0(vm_stderr, stderr)
+
 /* vm_read_file — read entire file into a malloc'd, null-terminated buffer */
 static spl_val_t vm_read_file(int nargs, spl_val_t *args) {
     CHECK_NARGS("vm_read_file", 1);
@@ -357,6 +361,9 @@ void spl_syscall_register(spl_prog_t *prog) {
         {"vm_fread", 0, vm_fread},
         {"vm_fwrite", 0, vm_fwrite},
         {"vm_fsize", 0, vm_fsize},
+        {"vm_stdin", 0, vm_stdin},
+        {"vm_stdout", 0, vm_stdout},
+        {"vm_stderr", 0, vm_stderr},
         {"vm_read_file", 0, vm_read_file},
         {"vm_alloc", 0, vm_alloc},
         {"vm_free", 0, vm_free},