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! crt1.s for sparc & sparcv9 (SunOS 5)
! Copyright (C) 1992-2021 Free Software Foundation, Inc.
! Written By David Vinayak Henkel-Wallace, June 1992
!
! This file 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 3, or (at your option) any
! later version.
!
! This file 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.
!
! Under Section 7 of GPL version 3, you are granted additional
! permissions described in the GCC Runtime Library Exception, version
! 3.1, as published by the Free Software Foundation.
!
! You should have received a copy of the GNU General Public License and
! a copy of the GCC Runtime Library Exception along with this program;
! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
! <http://www.gnu.org/licenses/>.
! This file takes control of the process from the kernel, as specified
! in section 3 of the SVr4 ABI.
! This file is the first thing linked into any executable.
#ifdef __sparcv9
#define CPTRSIZE 8
#define CPTRSHIFT 3
#define STACK_BIAS 2047
#define ldn ldx
#define stn stx
#define setn(s, scratch, dst) setx s, scratch, dst
#else
#define CPTRSIZE 4
#define CPTRSHIFT 2
#define STACK_BIAS 0
#define ldn ld
#define stn st
#define setn(s, scratch, dst) set s, dst
#endif
.section ".text"
.proc 022
.global _start
_start:
mov 0, %fp ! Mark bottom frame pointer
ldn [%sp + (16 * CPTRSIZE) + STACK_BIAS], %l0 ! argc
add %sp, (17 * CPTRSIZE) + STACK_BIAS, %l1 ! argv
! Leave some room for a call. Sun leaves 32 octets (to sit on
! a cache line?) so we do too.
#ifdef __sparcv9
sub %sp, 48, %sp
#else
sub %sp, 32, %sp
#endif
! %g1 may contain a function to be registered w/atexit
orcc %g0, %g1, %g0
#ifdef __sparcv9
be %xcc, .nope
#else
be .nope
#endif
mov %g1, %o0
call atexit
nop
.nope:
! Now make sure constructors and destructors are handled.
setn(_fini, %o1, %o0)
call atexit, 1
nop
call _init, 0
nop
! We ignore the auxiliary vector; there is no defined way to
! access those data anyway. Instead, go straight to main:
mov %l0, %o0 ! argc
mov %l1, %o1 ! argv
#ifdef GCRT1
setn(___Argv, %o4, %o3)
stn %o1, [%o3] ! *___Argv
#endif
! Skip argc words past argv, to env:
sll %l0, CPTRSHIFT, %o2
add %o2, CPTRSIZE, %o2
add %l1, %o2, %o2 ! env
setn(_environ, %o4, %o3)
stn %o2, [%o3] ! *_environ
call main, 4
nop
call exit, 0
nop
call _exit, 0
nop
! We should never get here.
.type _start,#function
.size _start,.-_start
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