Linux: Implement a useful version of _startup_fatal

On i386 and ia64, the TCB is not available at this point.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/startup.h b/sysdeps/unix/sysv/linux/startup.h
new file mode 100644
index 0000000000..39859b404a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/startup.h
@@ -0,0 +1,39 @@
+/* Linux definitions of functions used by static libc main startup.
+   Copyright (C) 2017-2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifdef SHARED
+# include_next <startup.h>
+#else
+# include <sysdep.h>
+
+/* Avoid a run-time invocation of strlen.  */
+#define _startup_fatal(message)                                         \
+  do                                                                    \
+    {                                                                   \
+      size_t __message_length = __builtin_strlen (message);             \
+      if (! __builtin_constant_p (__message_length))                    \
+        {                                                               \
+          extern void _startup_fatal_not_constant (void);               \
+          _startup_fatal_not_constant ();                               \
+        }                                                               \
+      INTERNAL_SYSCALL_CALL (write, STDERR_FILENO, (message),           \
+                             __message_length);                         \
+      INTERNAL_SYSCALL_CALL (exit_group, 127);                          \
+    }                                                                   \
+  while (0)
+#endif  /* !SHARED */