From ae9bb92ccc2b4a9a75b09c59e1351a78e6a6da53 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Fri, 4 May 2001 17:03:47 +0000 Subject: Initial sparc port, thanks to Mathew Bosworth , who sent this to me a month ago and I forgot to check it in. Oops. Better late then never. -Erik --- libc/sysdeps/linux/sparc/crt0.S | 90 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 libc/sysdeps/linux/sparc/crt0.S (limited to 'libc/sysdeps/linux/sparc/crt0.S') diff --git a/libc/sysdeps/linux/sparc/crt0.S b/libc/sysdeps/linux/sparc/crt0.S new file mode 100644 index 000000000..7910131db --- /dev/null +++ b/libc/sysdeps/linux/sparc/crt0.S @@ -0,0 +1,90 @@ +/* + * 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 + + + -- cgit v1.2.3