2012-03-27 23:13:14 +00:00
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! crt1.s for sparc & sparcv9 (SunOS 5)
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2017-10-07 00:16:47 +00:00
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! Copyright (C) 1992-2017 Free Software Foundation, Inc.
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2012-03-27 23:13:14 +00:00
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! Written By David Vinayak Henkel-Wallace, June 1992
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!
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! This file is free software; you can redistribute it and/or modify it
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! under the terms of the GNU General Public License as published by the
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! Free Software Foundation; either version 3, or (at your option) any
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! later version.
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!
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! This file is distributed in the hope that it will be useful, but
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! WITHOUT ANY WARRANTY; without even the implied warranty of
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! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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! General Public License for more details.
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!
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! Under Section 7 of GPL version 3, you are granted additional
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! permissions described in the GCC Runtime Library Exception, version
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! 3.1, as published by the Free Software Foundation.
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!
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! You should have received a copy of the GNU General Public License and
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! a copy of the GCC Runtime Library Exception along with this program;
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! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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! <http://www.gnu.org/licenses/>.
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! This file takes control of the process from the kernel, as specified
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! in section 3 of the SVr4 ABI.
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! This file is the first thing linked into any executable.
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#ifdef __sparcv9
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#define CPTRSIZE 8
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#define CPTRSHIFT 3
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#define STACK_BIAS 2047
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#define ldn ldx
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#define stn stx
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#define setn(s, scratch, dst) setx s, scratch, dst
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#else
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#define CPTRSIZE 4
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#define CPTRSHIFT 2
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#define STACK_BIAS 0
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#define ldn ld
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#define stn st
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#define setn(s, scratch, dst) set s, dst
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#endif
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.section ".text"
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.proc 022
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.global _start
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_start:
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mov 0, %fp ! Mark bottom frame pointer
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ldn [%sp + (16 * CPTRSIZE) + STACK_BIAS], %l0 ! argc
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add %sp, (17 * CPTRSIZE) + STACK_BIAS, %l1 ! argv
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! Leave some room for a call. Sun leaves 32 octets (to sit on
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! a cache line?) so we do too.
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#ifdef __sparcv9
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sub %sp, 48, %sp
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#else
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sub %sp, 32, %sp
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#endif
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! %g1 may contain a function to be registered w/atexit
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orcc %g0, %g1, %g0
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#ifdef __sparcv9
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be %xcc, .nope
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#else
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be .nope
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#endif
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mov %g1, %o0
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call atexit
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nop
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.nope:
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! Now make sure constructors and destructors are handled.
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setn(_fini, %o1, %o0)
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call atexit, 1
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nop
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call _init, 0
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nop
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! We ignore the auxiliary vector; there is no defined way to
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! access those data anyway. Instead, go straight to main:
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mov %l0, %o0 ! argc
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mov %l1, %o1 ! argv
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#ifdef GCRT1
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setn(___Argv, %o4, %o3)
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stn %o1, [%o3] ! *___Argv
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#endif
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! Skip argc words past argv, to env:
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sll %l0, CPTRSHIFT, %o2
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add %o2, CPTRSIZE, %o2
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add %l1, %o2, %o2 ! env
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setn(_environ, %o4, %o3)
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stn %o2, [%o3] ! *_environ
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call main, 4
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nop
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call exit, 0
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nop
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call _exit, 0
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nop
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! We should never get here.
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.type _start,#function
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.size _start,.-_start
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