# # 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, see <http://www.gnu.org/licenses/>. # /* * * 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