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/*
* xrt0.s for ERC32.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU 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 General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 675
* Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* code taken from leonccs 1.0 leon/src/libio/crt0.S
I don't know if this is available anymore, now that LECCS
is out. And I'm not sure if this source is in the LECCS distro :(
*/
.text
! Original :
! .global __start, _main
! uC-libc version :
.global _start
.global __uClibc_main
! Start the real-time clock with a tick of 14 clocks
!
_start:
save %sp, -64, %sp
/* clear the bss */
sethi %hi(edata),%g2
or %g2,%lo(edata),%g2 ! g2 = start of bss
sethi %hi(_end),%g3
or %g3,%lo(_end),%g3 ! g3 = end of bss
mov %g0,%g1 ! so std has two zeros
zerobss:
std %g0,[%g2]
add %g2,8,%g2
cmp %g2,%g3
bleu,a zerobss
nop
/* move data segment to proper location */
relocd:
set (_endtext),%g2 ! g2 = start of data in aout file
set (_environ),%g4 ! g4 = start of where data should go
set (_edata),%g3 ! g3 = end of where data should go
subcc %g3, %g4, %g5 ! g5 = length of data
subcc %g4, %g2, %g0 ! need to relocate data ?
ble initok
ld [%g4], %g6
! subcc %g6, 1, %g0
! be initok
mvdata:
subcc %g5, 8, %g5
ldd [%g2 + %g5], %g6
bg mvdata
std %g6, [%g4 + %g5]
initok:
! call _main
call __uClibc_main
nop
! Should not return from uClibc main()
! ret
! nop
.seg "data"
.global .bdata
.bdata:
.align 8
.global _environ ! first symbol in sdata
_environ:
.word 1
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