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/* Startup code for SH & ELF.
Copyright (C) 1999 Free Software Foundation, Inc.
Copyright (C) 2001 Hewlett-Packard Australia
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, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Derived in part from the Linux-8086 C library, the GNU C Library, and several
other sundry sources. Files within this library are copyright by their
respective copyright holders.
*/
/* 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.
WARNING: At that stage only static linker is supported. For
uCLinux we won't bother with r4.
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
_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+,r4
mov r15, r5
/* set up the value for the environment pointer
r6 = (argc+1)*4+argv
*/
mov r4,r6
add #1,r6
shll2 r6
add r5,r6
! Clear BSS area
mov.l 3f, r1
add #4, r1
mov.l 4f, r2
mov #0, r0
9: cmp/hs r2, r1
bf/s 9b ! while (r1 < r2)
mov.l r0,@-r2
/* call main */
mov.l L_main,r1
jsr @r1
nop
/* should never get here....*/
mov.l L_abort,r1
jsr @r1
nop
.align 2
3: .long __bss_start
4: .long _end
L_main:
.long __uClibc_main
L_abort:
.long abort
.data
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