| # |
| # crt0.S, part of the i960 support for the uClibc library. |
| # |
| # Copyright (C) 2002 by Okiok Data Ltd. http://www.okiok.com/ |
| # |
| # This program 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. |
| # |
| # This program 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 this program; if not, write to the Free Software Foundation, Inc., |
| # at 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| # |
| |
| /* |
| * |
| * The behavior in this file is tightly coupled with how the linux kernel sets things up |
| * on the stack before calling us. |
| * |
| * Currently fs/binfmt_flat.c (for STACK_GROWS_UP) and arch/i960/kernel/process.c |
| * build things so that a pointer to argc is left in g13 by start_thread(). |
| * |
| * ^ |
| * | <- sp somewhere around here, after being aligned. |
| * | |
| * |envp -> envp[0] |
| * |argv -> argv[0] |
| * |argc <- g13 |
| * |
| * A complete picture of how things are set up can be seen in the comments of |
| * create_flat_tables_stack_grows_up in fs/binfmt_flat.c |
| * |
| * I believe having to use this register could probably be avoided. |
| * |
| */ |
| |
| .globl start |
| start: |
| mov g13, r3 |
| ldt (r3), g0 |
| callx ___uClibc_main |
| |
| /* We might want to add some instruction so that it crashes if main returns */ |
| |
| /* Define a symbol for the first piece of initialized data. */ |
| .data |
| .globl __data_start |
| __data_start: |
| .long 0 |
| .weak data_start |
| data_start = __data_start |
| |