1998-03-18 14:42:25 +00:00
|
|
|
/* Startup code for ARM & ELF
|
|
|
|
|
Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
|
|
|
|
|
published by the Free Software Foundation; either version 2 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
|
|
|
|
|
Library General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
|
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
|
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
|
|
|
|
/* 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
|
|
|
|
|
|
|
|
|
|
|
1998-04-01 09:15:07 +00:00
|
|
|
At this entry point, most registers' values are unspecified, except:
|
1998-03-18 14:42:25 +00:00
|
|
|
|
1998-04-01 09:15:07 +00:00
|
|
|
a1 Contains a function pointer to be registered with `atexit'.
|
1998-03-18 14:42:25 +00:00
|
|
|
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:
|
1998-04-01 09:15:07 +00:00
|
|
|
0(sp) argc
|
|
|
|
|
4(sp) argv[0]
|
1998-03-18 14:42:25 +00:00
|
|
|
...
|
1998-04-01 09:15:07 +00:00
|
|
|
(4*argc)(sp) NULL
|
|
|
|
|
(4*(argc+1))(sp) envp[0]
|
1998-03-18 14:42:25 +00:00
|
|
|
...
|
|
|
|
|
NULL
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
.text
|
|
|
|
|
.globl _start
|
|
|
|
|
_start:
|
1998-04-01 09:15:07 +00:00
|
|
|
/* Clear the frame pointer since this is the outermost frame. */
|
1998-03-18 14:42:25 +00:00
|
|
|
mov fp, #0
|
|
|
|
|
|
1998-04-01 09:15:07 +00:00
|
|
|
/* Pop argc off the stack and save a pointer to argv */
|
|
|
|
|
ldmfd sp!, {a2}
|
|
|
|
|
mov a3, sp
|
|
|
|
|
|
|
|
|
|
/* Push the last arguments to main() onto the stack */
|
|
|
|
|
stmfd sp!, {a1}
|
|
|
|
|
ldr a1, =_fini
|
|
|
|
|
stmfd sp!, {a1}
|
|
|
|
|
|
|
|
|
|
/* Set up the other arguments for main() that go in registers */
|
|
|
|
|
ldr a1, =main
|
|
|
|
|
ldr a4, =_init
|
|
|
|
|
|
|
|
|
|
/* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */
|
|
|
|
|
|
|
|
|
|
/* Let the libc call main and exit with its return code. */
|
|
|
|
|
bl __libc_start_main
|
1998-03-18 14:42:25 +00:00
|
|
|
/* 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
|
