/* Startup code for ARM & ELF

   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.

   In addition to the permissions in the GNU Lesser General Public

   License, the Free Software Foundation gives you unlimited

   permission to link the compiled version of this file with other

   programs, and to distribute those programs without any restriction

   coming from the use of this file. (The GNU Lesser General Public

   License restrictions do apply in other respects; for example, they

   cover modification of the file, and distribution when not linked

   into another program.)

   Note that people who make modified versions of this file are not

   obligated to grant this special exception for their modified

   versions; it is their choice whether to do so. The GNU Lesser

   General Public License gives permission to release a modified

   version without this exception; this exception also makes it

   possible to release a modified version which carries forward this

   exception.

   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/>.  */

/* 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:

   a1		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

		4(sp)			argv[0]

		...

		(4*argc)(sp)		NULL

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

		...

					NULL

*/

/* Tag_ABI_align8_preserved: This code preserves 8-byte

   alignment in any callee.  */

	.eabi_attribute 25, 1

/* Tag_ABI_align8_needed: This code may require 8-byte alignment from

   the caller.  */

	.eabi_attribute 24, 1

#if defined(__thumb2__)

	.thumb

	.syntax unified

#endif

	.text

	.globl _start

	.type _start,#function

_start:

       /* Protect against unhandled exceptions.  */

       .fnstart

	/* Clear the frame pointer and link register since this is the outermost frame. */

	mov fp, #0

	mov lr, #0

	/* Pop argc off the stack and save a pointer to argv */

	pop { a2 }

	mov a3, sp

	/* Push stack limit */

	push { a3 }

	/* Push rtld_fini */

	push { a1 }

#ifdef PIC

	ldr sl, .L_GOT

	adr a4, .L_GOT

	add sl, sl, a4

	ldr ip, .L_GOT+4	/* __libc_csu_fini */

	ldr ip, [sl, ip]

	push { ip }		/* Push __libc_csu_fini */

	ldr a4, .L_GOT+8	/* __libc_csu_init */

	ldr a4, [sl, a4]

	ldr a1, .L_GOT+12	/* main */

	ldr a1, [sl, a1]

	/* __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(PLT)

#else

	/* Fetch address of __libc_csu_fini */

	ldr ip, =__libc_csu_fini

	/* Push __libc_csu_fini */

	push { ip }

	/* Set up the other arguments in registers */

	ldr a1, =main

	ldr a4, =__libc_csu_init

	/* __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

#endif

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

	bl abort

#ifdef PIC

	.align 2

.L_GOT:

	.word _GLOBAL_OFFSET_TABLE_ - .L_GOT

	.word __libc_csu_fini(GOT)

	.word __libc_csu_init(GOT)

	.word main(GOT)

#endif

       .cantunwind

       .fnend

/* 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