/* * 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) /* 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