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commit e7ca2a475cf2e7ffc987b8d08e1a40337840b500
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon May 9 18:15:16 2022 +0200
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Linux: Implement a useful version of _startup_fatal
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On i386 and ia64, the TCB is not available at this point.
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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(cherry picked from commit a2a6bce7d7e52c1c34369a7da62c501cc350bc31)
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diff --git a/sysdeps/unix/sysv/linux/i386/startup.h b/sysdeps/unix/sysv/linux/i386/startup.h
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index 192c765361c17ed1..213805d7d2d459be 100644
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--- a/sysdeps/unix/sysv/linux/i386/startup.h
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+++ b/sysdeps/unix/sysv/linux/i386/startup.h
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@@ -1,5 +1,5 @@
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/* Linux/i386 definitions of functions used by static libc main startup.
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- Copyright (C) 2017-2021 Free Software Foundation, Inc.
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+ Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@@ -16,22 +16,7 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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-#if BUILD_PIE_DEFAULT
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-/* Can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE. */
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-# define I386_USE_SYSENTER 0
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+/* Can't use "call *%gs:SYSINFO_OFFSET" during startup. */
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+#define I386_USE_SYSENTER 0
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-# include <sysdep.h>
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-# include <abort-instr.h>
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-
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-__attribute__ ((__noreturn__))
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-static inline void
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-_startup_fatal (const char *message __attribute__ ((unused)))
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-{
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- /* This is only called very early during startup in static PIE.
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- FIXME: How can it be improved? */
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- ABORT_INSTRUCTION;
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- __builtin_unreachable ();
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-}
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-#else
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-# include_next <startup.h>
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-#endif
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+#include_next <startup.h>
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diff --git a/sysdeps/unix/sysv/linux/ia64/startup.h b/sysdeps/unix/sysv/linux/ia64/startup.h
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new file mode 100644
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index 0000000000000000..77f29f15a2103ed5
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/ia64/startup.h
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@@ -0,0 +1,22 @@
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+/* Linux/ia64 definitions of functions used by static libc main startup.
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+ Copyright (C) 2022 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+/* This code is used before the TCB is set up. */
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+#define IA64_USE_NEW_STUB 0
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+
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+#include_next <startup.h>
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diff --git a/sysdeps/unix/sysv/linux/startup.h b/sysdeps/unix/sysv/linux/startup.h
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new file mode 100644
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index 0000000000000000..39859b404a84798b
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/startup.h
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@@ -0,0 +1,39 @@
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+/* Linux definitions of functions used by static libc main startup.
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+ Copyright (C) 2017-2022 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifdef SHARED
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+# include_next <startup.h>
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+#else
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+# include <sysdep.h>
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+
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+/* Avoid a run-time invocation of strlen. */
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+#define _startup_fatal(message) \
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+ do \
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+ { \
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+ size_t __message_length = __builtin_strlen (message); \
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+ if (! __builtin_constant_p (__message_length)) \
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+ { \
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+ extern void _startup_fatal_not_constant (void); \
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+ _startup_fatal_not_constant (); \
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+ } \
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+ INTERNAL_SYSCALL_CALL (write, STDERR_FILENO, (message), \
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+ __message_length); \
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+ INTERNAL_SYSCALL_CALL (exit_group, 127); \
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+ } \
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+ while (0)
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+#endif /* !SHARED */
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