/* Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

/* This is the canonical entry point, usually the first thing in the text

   segment.

   Note that the code in the .init section has already been run.

   This includes _init and _libc_init

   At this entry point, most registers' values are unspecified, except:

   x0/w0	Contains a function pointer to be registered with `atexit'.

		This is how the dynamic linker arranges to have DT_FINI

		functions called for shared libraries that have been loaded

		before this code runs.

   sp		The stack contains the arguments and environment:

		0(sp)			argc

		8(sp)			argv[0]

		...

		(8*argc)(sp)		NULL

		(8*(argc+1))(sp)	envp[0]

		...

					NULL

 */

	.text

	.globl _start

	.type _start,#function

_start:

	/* Create an initial frame with 0 LR and FP */

	mov	x29, #0

	mov	x30, #0

	/* Setup rtld_fini in argument register */

	mov	x5, x0

	/* Load argc and a pointer to argv */

	ldr	PTR_REG (1), [sp, #0]

	add	x2, sp, #PTR_SIZE

	/* Setup stack limit in argument register */

	mov	x6, sp

#ifdef PIC

# ifdef SHARED

        adrp    x0, :got:main

	ldr     PTR_REG (0), [x0, #:got_lo12:main]

        adrp    x3, :got:__libc_csu_init

	ldr     PTR_REG (3), [x3, #:got_lo12:__libc_csu_init]

        adrp    x4, :got:__libc_csu_fini

	ldr     PTR_REG (4), [x4, #:got_lo12:__libc_csu_fini]

# else

	adrp	x0, __wrap_main

	add	x0, x0, :lo12:__wrap_main

	adrp	x3, __libc_csu_init

	add	x3, x3, :lo12:__libc_csu_init

	adrp	x4, __libc_csu_fini

	add	x4, x4, :lo12:__libc_csu_fini

# endif

#else

	/* Set up the other arguments in registers */

	MOVL (0, main)

	MOVL (3, __libc_csu_init)

	MOVL (4, __libc_csu_fini)

#endif

	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini,

			      stack_end) */

	/* Let the libc call main and exit with its return code.  */

	bl	__libc_start_main

	/* should never get here....*/

	bl	abort

#if defined PIC && !defined SHARED

	/* When main is not defined in the executable but in a shared library

	   then a wrapper is needed in crt1.o of the static-pie enabled libc,

	   because crt1.o and rcrt1.o share code and the later must avoid the

	   use of GOT relocations before __libc_start_main is called.  */

__wrap_main:

	b	main

#endif

	/* 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