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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/unix/start.c
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initial import
Diffstat (limited to 'sysdeps/unix/start.c')
-rw-r--r--sysdeps/unix/start.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/unix/start.c b/sysdeps/unix/start.c
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+/* Copyright (C) 1991, 1993, 1995 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU C Library; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sysdep.h> /* In case it wants to define anything. */
+
+/* The first piece of initialized data. */
+int __data_start = 0;
+#ifdef HAVE_WEAK_SYMBOLS
+weak_alias (__data_start, data_start)
+#endif
+
+#ifdef DUMMIES
+#define ARG_DUMMIES DUMMIES,
+#define DECL_DUMMIES int DUMMIES;
+#else
+#define ARG_DUMMIES
+#define DECL_DUMMIES
+#endif
+
+VOLATILE int errno;
+
+#ifdef HAVE_WEAK_SYMBOLS
+weak_alias (__environ, environ)
+#else
+#undef environ
+#define __environ environ
+#endif
+
+char **__environ;
+
+extern void EXFUN(__libc_init, (int argc, char **argv, char **envp));
+extern int EXFUN(main, (int argc, char **argv, char **envp));
+
+
+/* Not a prototype because it gets called strangely. */
+static void start1();
+
+#ifndef HAVE__start
+
+#if !defined (NO_UNDERSCORES) && defined (__GNUC__)
+/* Declare _start with an explicit assembly symbol name of `start'
+ (note no leading underscore). This is the name vendor crt0.o's
+ tend to use, and thus the name most linkers expect. */
+void _start (void) asm ("start");
+#endif
+
+/* N.B.: It is important that this be the first function.
+ This file is the first thing in the text section. */
+void
+DEFUN_VOID(_start)
+{
+ start1();
+}
+
+#if !defined (NO_UNDERSCORES) && defined (HAVE_GNU_LD) && !defined (__GNUC__)
+/* Make an alias called `start' (no leading underscore,
+ so it can't conflict with C symbols) for `_start'. */
+asm(".stabs \"start\",11,0,0,0");
+asm(".stabs \"__start\",1,0,0,0");
+#endif
+
+#endif
+
+/* ARGSUSED */
+static void
+start1(ARG_DUMMIES argc, argp)
+ DECL_DUMMIES
+ int argc;
+ char *argp;
+{
+ char **argv = &argp;
+
+ /* The environment starts just after ARGV. */
+ __environ = &argv[argc + 1];
+
+ /* If the first thing after ARGV is the arguments
+ themselves, there is no environment. */
+ if ((char *) __environ == *argv)
+ /* The environment is empty. Make __environ
+ point at ARGV[ARGC], which is NULL. */
+ --__environ;
+
+ /* Do C library initializations. */
+ __libc_init (argc, argv, __environ);
+
+ /* Call the user program. */
+ exit(main(argc, argv, __environ));
+}