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author | Roland McGrath <roland@gnu.org> | 1996-02-13 11:07:05 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 1996-02-13 11:07:05 +0000 |
commit | 2a072de4a1b78ae6e7cfe7d6be4cd837f3cafaf5 (patch) | |
tree | 068c2612fa620e39dc67496386861e385f1643a8 /sysdeps/unix/sysv/linux/init-first.c | |
parent | 363113d02a48598cf903c5b5409f71fe2a16ba13 (diff) | |
download | glibc-2a072de4a1b78ae6e7cfe7d6be4cd837f3cafaf5.zip glibc-2a072de4a1b78ae6e7cfe7d6be4cd837f3cafaf5.tar.gz glibc-2a072de4a1b78ae6e7cfe7d6be4cd837f3cafaf5.tar.bz2 |
Tue Feb 13 05:12:02 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>
* 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.
Diffstat (limited to 'sysdeps/unix/sysv/linux/init-first.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/init-first.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/init-first.c b/sysdeps/unix/sysv/linux/init-first.c new file mode 100644 index 0000000..9d7774a --- /dev/null +++ b/sysdeps/unix/sysv/linux/init-first.c @@ -0,0 +1,86 @@ +/* Initialization code run first thing by the ELF startup code. Linux version. +Copyright (C) 1995, 1996 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 Library General Public License as +published by the Free Software Foundation; either version 2 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 +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <unistd.h> +#include <sysdep.h> +#include "fpu_control.h" + +/* This code is mostly the same for all machines. This version works at + least for i386 and m68k, and probably any CISCy machine with a normal + stack arrangement. */ + +extern void __libc_init (int, char **, char **); +extern void __libc_global_ctors (void); + + +static void +init (int *data) +{ + int argc = *data; + char **argv = (void *) (data + 1); + char **envp = &argv[argc + 1]; + +#ifdef __i386__ + /* Make sure we are not using the iBSC2 personality. The `personality' + syscall takes one argument; zero means the Linux personality. The + argument arrives in %ebx; we have to save and restore %ebx by hand + here, because GCC (as of 2.7.0) cannot handle saving and restoring it + for us when it is the dedicated GOT register for PIC. */ + asm ("pushl %%ebx\n" + "xorl %%ebx, %%ebx\n" + "int $0x80 # syscall no %0\n" + "popl %%ebx" + : : "a" (SYS_ify (personality))); +#endif + + /* Set the FPU control word to the proper default value. */ + __setfpucw (__fpu_control); + + __environ = envp; + __libc_init (argc, argv, envp); +} + +#ifdef PIC +/* This function is called to initialize the shared C library. + It is called just before the user _start code from i386/elf/start.S, + with the stack set up as that code gets it. */ + +/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT + pointer in the dynamic section based solely on that. It is convention + for this function to be in the `.init' section, but the symbol name is + the only thing that really matters!! */ +/*void _init (int argc, ...) __attribute__ ((unused, section (".init")));*/ + +void +_init (int argc, ...) +{ + init (&argc); + + __libc_global_ctors (); +} +#endif + + +void +__libc_init_first (int argc __attribute__ ((unused)), ...) +{ +#ifndef PIC + init (&argc); +#endif +} |