commit e7ca2a475cf2e7ffc987b8d08e1a40337840b500
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon May 9 18:15:16 2022 +0200
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>
(cherry picked from commit a2a6bce7d7e52c1c34369a7da62c501cc350bc31)
diff --git a/sysdeps/unix/sysv/linux/i386/startup.h b/sysdeps/unix/sysv/linux/i386/startup.h
index 192c765361c17ed1..213805d7d2d459be 100644
--- a/sysdeps/unix/sysv/linux/i386/startup.h
+++ b/sysdeps/unix/sysv/linux/i386/startup.h
@@ -1,5 +1,5 @@
/* Linux/i386 definitions of functions used by static libc main startup.
- Copyright (C) 2017-2021 Free Software Foundation, Inc.
+ Copyright (C) 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
@@ -16,22 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#if BUILD_PIE_DEFAULT
-/* Can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE. */
-# define I386_USE_SYSENTER 0
+/* Can't use "call *%gs:SYSINFO_OFFSET" during startup. */
+#define I386_USE_SYSENTER 0
-# include <sysdep.h>
-# include <abort-instr.h>
-
-__attribute__ ((__noreturn__))
-static inline void
-_startup_fatal (const char *message __attribute__ ((unused)))
-{
- /* This is only called very early during startup in static PIE.
- FIXME: How can it be improved? */
- ABORT_INSTRUCTION;
- __builtin_unreachable ();
-}
-#else
-# include_next <startup.h>
-#endif
+#include_next <startup.h>
diff --git a/sysdeps/unix/sysv/linux/ia64/startup.h b/sysdeps/unix/sysv/linux/ia64/startup.h
new file mode 100644
index 0000000000000000..77f29f15a2103ed5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/startup.h
@@ -0,0 +1,22 @@
+/* Linux/ia64 definitions of functions used by static libc main startup.
+ Copyright (C) 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/>. */
+
+/* This code is used before the TCB is set up. */
+#define IA64_USE_NEW_STUB 0
+
+#include_next <startup.h>
diff --git a/sysdeps/unix/sysv/linux/startup.h b/sysdeps/unix/sysv/linux/startup.h
new file mode 100644
index 0000000000000000..39859b404a84798b
--- /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 */