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/*
* libc/sysdeps/linux/nios2/crt0.S -- entry point for linux/nios2
*
* Copyright (C) 2004,05,06 Microtronix Datacom Ltd
*
* 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 Wentao Xu <wentao@microtronix.com>
* Updated by Thomas Chou <thomas@wytron.com.tw> for crt1.S
*
*/
#include <features.h>
#include <asm/unistd.h>
.global _start
.type __start,@function
.weak _init
.weak _fini
.type main,@function
.type __uClibc_main,@function
.type __h_errno_location, @function
.type _stdio_init, @function
.type _stdio_term, @function
.text
.balign 4
_start:
nop
br 0f
.long _stext /* start address of .text + 4 */
.long _etext /* start address of .data */
.long _edata /* start address of .bss */
0:
/* load gp */
movhi gp, %hiadj(_gp)
addi gp, gp, %lo(_gp)
/* load main, argc, argv from stack */
movhi r4, %hi(main)
ori r4, r4, %lo(main) /* main */
ldw r5, 0(sp) /* argc */
ldw r6, 4(sp) /* argv */
/* load the 4th arg */
movhi r7, %hi(_init)
ori r7, r7, %lo(_init)
/* Allocate space on the stack for 6-7th arg, reuse 5th space */
addi sp,sp,-8
/* push 5-7th args on stack */
movhi r8, %hi(_fini)
ori r8, r8, %lo(_fini)
stw r8, 0(sp)
stw r2, 4(sp) /* rtld_fini */
stw sp, 8(sp) /* stack_end */
/* call uClibc_main, shouldn't return */
#ifdef __PIC__
/* just pray 16 bit offset is enough */
br __uClibc_main
#else
call __uClibc_main
#endif
/* crash in the event of return */
__exit:
movui r2, TRAP_ID_SYSCALL
movui r3, __NR_exit
trap
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