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/*
 * libc/sysdeps/linux/microblaze/crt0.S -- Initial program entry point for linux/microblaze
 *
 *  Copyright (C) 2003       John Williams <jwilliams@itee.uq.edu.au>
 *  Copyright (C) 2001,2002  NEC Corporation
 *  Copyright (C) 2001,2002  Miles Bader <miles@gnu.org>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License.  See the file COPYING.LIB in the main
 * directory of this archive for more details.
 * 
 * Written by Miles Bader <miles@gnu.org>
 */

#include <clinkage.h>

/* Upon entry, the stack contains the following data:
        argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
*/

        .text
C_ENTRY(_start):        
        lw      r5, r0, r1              // Arg 0: argc

        addi    r6, r1, 4               // Arg 1: argv

                                        // Arg 2: envp
        addi    r3, r5, 1               // skip argc elements to get envp start
                                        // ...plus the NULL at the end of argv
        add     r3, r3, r3              // Make word offset
        add     r3, r3, r3
        add     r7, r6, r3              // add to argv to get offset

        // Load SDAs
        la      r2, r0, C_SYMBOL_NAME(_SDA_BASE_)
        la      r13, r0, C_SYMBOL_NAME(_SDA2_BASE_)

        // tail-call uclibc's startup routine
        brid    C_SYMBOL_NAME(__uClibc_main)
        nop


/* Stick in a dummy reference to `main', so that if an application
   is linking when the `main' function is in a static library (.a)
   we can be sure that `main' actually gets linked in.  */
L_dummy_main_reference:
        .long   C_SYMBOL_NAME(main)