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/* Startup code for SH & ELF.
Copyright (C) 1999 Free Software Foundation, Inc.
Copyright (C) 2001 Hewlett-Packard Australia
Copyright (C) 2002 Stefan Allius
This program 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.
This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
*/
/* This is the canonical entry point, usually the first thing in the text
segment.
At this entry point, most registers' values are unspecified, except:
r4 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
*/
#include <features.h>
.text
.globl _start
.type _start,%function
.type main,%function
_start:
/* Clear the frame pointer since this is the outermost frame. */
mov #0, r14
/* Pop argc off the stack and save a pointer to argv */
mov.l @r15+,r5
mov r15, r6
/* Push the stack_end, rtld_fini and fini func onto the stack */
mov.l r6,@-r15
mov.l r4,@-r15
#ifdef __PIC__
mova L_got, r0
mov.l L_got, r12
add r0, r12
mov.l L_fini,r0
add r12, r0
mov.l r0,@-r15
/* Set up the main/init funcs that go in registers */
mov.l L_main, r4
add r12, r4
mov.l L_init, r7
add r12, r7
/* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
/* Let the libc call main and exit with its return code. */
mov.l L_uClibc_main,r0
mov.l @(r0,r12),r1
jsr @r1
nop
/* We should not get here. */
mov.l L_abort,r0
mov.l @(r0,r12),r1
jsr @r1
nop
#else
mov.l L_fini,r0
mov.l r0,@-r15
/* Set up the main/init funcs that go in registers */
mov.l L_main,r4
mov.l L_init,r7
/* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
/* Let the libc call main and exit with its return code. */
mov.l L_uClibc_main,r1
jsr @r1
nop
/* We should not get here. */
mov.l L_abort,r1
jmp @r1
nop
#endif
.size _start,.-_start
.align 2
#ifdef __PIC__
L_got:
.long _GLOBAL_OFFSET_TABLE_
L_main:
.long main@GOTOFF
L_init:
.long _init@GOTOFF
L_fini:
.long _fini@GOTOFF
L_uClibc_main:
.long __uClibc_main@GOT
L_abort:
.long abort@GOT
#else
L_main:
.long main
L_init:
.long _init
L_fini:
.long _fini
L_uClibc_main:
.long __uClibc_main
L_abort:
.long abort
#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
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