glibc/sysdeps/arm/elf/start.S
Ulrich Drepper e361ccd999 Update.
2002-12-20  Art Haas  <ahaas@airmail.net>

	* sysdeps/gnu/siglist.c: Convert GCC extension initializer
	syntax to C99.

2002-12-21  Philip Blundell  <philb@gnu.org>

	* sysdeps/arm/elf/start.S (_start): Optimise a little.  Push stack
	top as seventh arg to __libc_start_main.
	Reported by paulnash@wildseed.com.

	* sysdeps/unix/sysv/linux/arm/clone.S: Small optimisation.

	* sysdeps/unix/sysv/linux/arm/sigcontextinfo.h: Elide
	compatibility cruft when new enough kernel is assumed.
2002-12-21 18:53:25 +00:00

86 lines
2.4 KiB
ArmAsm

/* Startup code for ARM & ELF
Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002 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, 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
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
*/
.text
.globl _start
.type _start,#function
_start:
/* Fetch address of fini */
ldr ip, =__libc_csu_fini
/* Clear the frame pointer since this is the outermost frame. */
mov fp, #0
/* Pop argc off the stack and save a pointer to argv */
ldr a2, [sp], #4
mov a3, sp
/* Push stack limit */
str a3, [sp, #-4]!
/* Push rtld_fini */
str a1, [sp, #-4]!
/* Set up the other arguments in registers */
ldr a1, =main
ldr a4, =__libc_csu_init
/* Push fini */
str ip, [sp, #-4]!
/* __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