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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.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2022-05-09 18:15:16 +02:00
parent 18bd9c3d3b
commit a2a6bce7d7
3 changed files with 65 additions and 19 deletions
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23
sysdeps/unix/sysv/linux/i386/startup.h
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@ -1,5 +1,5 @@
/* Linux/i386 definitions of functions used by static libc main startup.
Copyright (C) 2017-2022 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>

22
sysdeps/unix/sysv/linux/ia64/startup.h Normal file
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@ -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>

39
sysdeps/unix/sysv/linux/startup.h Normal file
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@ -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 */