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2a072de4a1
* sysdeps/unix/sysv/linux/Makefile [$(subdir)=math] (sysdep_routines): Append setfpucw. (extra-objs): Append ieee-fpucw.o. (install-lib): Append libieee.a. (libieee.a): New target. * sysdeps/unix/sysv/linux/ieee-fpucw.c: New file. * sysdeps/unix/sysv/linux/i386/fpu_control.h (_FPU_GETCW, _FPU_SETCW): New macros. (fpu_control_t): New typedef. (__setfpucw): Use fpu_control_t for argument type. * sysdeps/unix/sysv/linux/fpu_control.c: Moved from linux/i386. * sysdeps/unix/sysv/linux/init-first.c: Moved from linux/i386. * sysdeps/unix/sysv/linux/Makefile [$(subdir)=math] (sysdep_routines): Append setfpucw. (extra-objs): Append ieee-fpucw.o. (install-lib): Append libieee.a. (libieee.a): New target. * sysdeps/unix/sysv/linux/ieee-fpucw.c: New file. * sysdeps/unix/sysv/linux/i386/fpu_control.h (_FPU_GETCW, _FPU_SETCW): New macros. (fpu_control_t): New typedef. (__setfpucw): Use fpu_control_t for argument type. * sysdeps/unix/sysv/linux/fpu_control.c: Moved from linux/i386. * sysdeps/unix/sysv/linux/init-first.c: Moved from linux/i386.
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux version.
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Copyright (C) 1995, 1996 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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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <unistd.h>
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#include <sysdep.h>
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#include "fpu_control.h"
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/* This code is mostly the same for all machines. This version works at
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least for i386 and m68k, and probably any CISCy machine with a normal
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stack arrangement. */
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extern void __libc_init (int, char **, char **);
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extern void __libc_global_ctors (void);
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static void
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init (int *data)
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{
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int argc = *data;
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char **argv = (void *) (data + 1);
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char **envp = &argv[argc + 1];
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#ifdef __i386__
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/* Make sure we are not using the iBSC2 personality. The `personality'
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syscall takes one argument; zero means the Linux personality. The
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argument arrives in %ebx; we have to save and restore %ebx by hand
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here, because GCC (as of 2.7.0) cannot handle saving and restoring it
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for us when it is the dedicated GOT register for PIC. */
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asm ("pushl %%ebx\n"
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"xorl %%ebx, %%ebx\n"
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"int $0x80 # syscall no %0\n"
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"popl %%ebx"
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: : "a" (SYS_ify (personality)));
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#endif
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/* Set the FPU control word to the proper default value. */
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__setfpucw (__fpu_control);
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__environ = envp;
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__libc_init (argc, argv, envp);
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}
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#ifdef PIC
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/* This function is called to initialize the shared C library.
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It is called just before the user _start code from i386/elf/start.S,
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with the stack set up as that code gets it. */
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/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT
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pointer in the dynamic section based solely on that. It is convention
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for this function to be in the `.init' section, but the symbol name is
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the only thing that really matters!! */
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/*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/
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void
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_init (int argc, ...)
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{
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init (&argc);
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__libc_global_ctors ();
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}
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#endif
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void
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__libc_init_first (int argc __attribute__ ((unused)), ...)
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{
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#ifndef PIC
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init (&argc);
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#endif
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}
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