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/* Copyright (C) 1995-2015 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/>. */
/* 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 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 x1, [sp, #0]
add x2, sp, #8
/* Setup stack limit in argument register */
mov x6, sp
#ifdef SHARED
adrp x0, :got:main
ldr x0, [x0, #:got_lo12:main]
adrp x3, :got:__libc_csu_init
ldr x3, [x3, #:got_lo12:__libc_csu_init]
adrp x4, :got:__libc_csu_fini
ldr x4, [x4, #:got_lo12:__libc_csu_fini]
#else
/* Set up the other arguments in registers */
ldr x0, =main
ldr x3, =__libc_csu_init
ldr x4, =__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
/* 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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