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authorRoland McGrath <roland@gnu.org>1996-02-13 11:07:05 +0000
committerRoland McGrath <roland@gnu.org>1996-02-13 11:07:05 +0000
commit2a072de4a1b78ae6e7cfe7d6be4cd837f3cafaf5 (patch)
tree068c2612fa620e39dc67496386861e385f1643a8 /sysdeps/unix/sysv/linux/init-first.c
parent363113d02a48598cf903c5b5409f71fe2a16ba13 (diff)
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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.c86
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 0000000000..9d7774a19e
--- /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
+}