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/* Startup code compliant to the ELF PowerPC ABI.
Copyright (C) 1997 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. */
/* This is SVR4/PPC ABI compliant, and works under Linux when
statically linked. */
#include <unistd.h>
#include <stdlib.h>
/* Just a little assembler stub before gcc gets its hands on our
stack pointer... */
asm ("\
.text
.globl _start
_start:
# save the stack pointer, in case we're statically linked under Linux
mr 8,1
# set up an initial stack frame, and clear the LR
addi 1,1,-16
clrrwi 1,1,4
li 0,0
stw 0,0(1)
mtlr 0
# set r13 to point at the 'small data area'
lis 13,_SDA_BASE_@ha
addi 13,13,_SDA_BASE_@l
# and continue below.
b __start1
");
/* Define a symbol for the first piece of initialized data. */
int __data_start = 0;
weak_alias (__data_start, data_start)
/* these probably should go, at least go somewhere else
(sysdeps/mach/something?). */
void (*_mach_init_routine) (void);
void (*_thread_init_routine) (void);
void __libc_init_first (int argc, char **argv, char **envp);
int main (int argc, char **argv, char **envp, void *auxvec);
#ifdef HAVE_INITFINI
void _init (void);
void _fini (void);
#endif
static void __start1(int argc, char **argv, char **envp,
void *auxvec, void (*exitfn) (void), char **arguments)
__attribute__ ((unused));
static void
__start1(int argc, char **argv, char **envp,
void *auxvec, void (*exitfn) (void),
char **arguments)
{
/* the PPC SVR4 ABI says that the top thing on the stack will
be a NULL pointer, so if not we assume that we're being called
as a statically-linked program by Linux. */
int abi_compliant_startup = *arguments == NULL;
if (!abi_compliant_startup)
{
argc = *(int *) arguments;
argv = arguments+1;
envp = argv+argc+1;
auxvec = envp;
while (auxvec != NULL)
auxvec++;
auxvec++;
exitfn = NULL;
}
if (exitfn != NULL)
atexit (exitfn);
/* libc init routine, in case we are statically linked
(otherwise ld.so will have called it when it loaded libc, but
calling it twice doesn't hurt). */
__libc_init_first (argc, argv, envp);
#ifdef HAVE_INITFINI
/* ELF constructors/destructors */
atexit (_fini);
_init ();
#endif
/* Stuff so we can build Mach/Linux executables (like vmlinux). */
if (_mach_init_routine != 0)
_mach_init_routine ();
if (_thread_init_routine != 0)
_thread_init_routine ();
/* the rest of the program */
exit (main (argc, argv, envp, auxvec));
}
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