diff options
Diffstat (limited to 'sysdeps/unix/arm')
-rw-r--r-- | sysdeps/unix/arm/start.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/sysdeps/unix/arm/start.c b/sysdeps/unix/arm/start.c new file mode 100644 index 0000000000..772384727a --- /dev/null +++ b/sysdeps/unix/arm/start.c @@ -0,0 +1,85 @@ +/* Special startup code for ARM a.out binaries. + Copyright (C) 1998 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> +#include <sysdep.h> + +/* The first piece of initialized data. */ +int __data_start = 0; +#ifdef HAVE_WEAK_SYMBOLS +weak_alias (__data_start, data_start) +#endif + +#ifndef errno +volatile int __errno; +strong_alias (__errno, errno) +#endif + +extern void __libc_init __P ((int argc, char **argv, char **envp)); +extern int main __P ((int argc, char **argv, char **envp)); + +/* N.B.: It is important that this be the first function. + This file is the first thing in the text section. */ + +/* If this was in C it might create its own stack frame and + screw up the arguments. */ +#ifdef NO_UNDERSCORES +asm (".text; .globl _start; _start: B start1"); +#else +asm (".text; .globl __start; __start: B _start1"); + +/* Make an alias called `start' (no leading underscore, so it can't + conflict with C symbols) for `_start'. This is the name vendor crt0.o's + tend to use, and thus the name most linkers expect. */ +asm (".set start, __start"); +#endif + +/* Fool gcc into thinking that more args are passed. This makes it look + on the stack (correctly) for the real arguments. It causes somewhat + strange register usage in start1(), but we aren't too bothered about + that at the moment. */ +#define DUMMIES a1, a2, a3, a4 + +#ifdef DUMMIES +#define ARG_DUMMIES DUMMIES, +#define DECL_DUMMIES int DUMMIES; +#else +#define ARG_DUMMIES +#define DECL_DUMMIES +#endif + +/* ARGSUSED */ +static void +start1 (ARG_DUMMIES argc, argv, envp) + DECL_DUMMIES + int argc; + char **argv; + char **envp; +{ + /* Store a pointer to the environment. */ + __environ = envp; + + /* Do C library initializations. */ + __libc_init (argc, argv, __environ); + + /* Call the user program. */ + exit (main (argc, argv, __environ)); +} |