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/*
* libc/sysdeps/linux/microblaze/crt1.S -- Initial program entry point for linux/microblaze
*
* Copyright (C) 2009 Meyer Sound Laboratories
* 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 <libc-symbols.h>
/* Upon entry, the stack contains the following data:
argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
*/
.text
.globl C_SYMBOL_NAME(_start)
.align 4
C_SYMBOL_NAME(_start):
/*
Preparing arguments for uClibc's startup routine.
The routine has 6 arguments, so 5 of them are placed
into registers, one on the stack
*/
la r5, r0, C_SYMBOL_NAME(main) /* Arg 1: main() */
lw r6, r0, r1 /* Arg 2: argc */
addi r7, r1, 4 /* Arg 3: argv */
la r8, r0, _init /* Arg 4: init */
la r9, r0, _fini /* Arg 5: fini */
addk r10,r0,r0 /* Arg 6: rtld_fini = NULL */
/* Reserve space for __uClibc_main to save parameters
(Microblaze ABI stack calling convention)
and for stack_end argument to __uClibc_main */
add r3, r1, r0
addi r1, r1, -32
/* tail-call uClibc's startup routine */
brid C_SYMBOL_NAME(__uClibc_main)
swi r3, r1, 28 /* Arg 7: stack end [DELAY SLOT] */
/* 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
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