NetBSD/lib/csu/sparc/crt0.c

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/* $NetBSD: crt0.c,v 1.26 1998/09/05 13:20:08 pk Exp $ */
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/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
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* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
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#include "common.h"
extern unsigned char etext;
extern unsigned char eprol __asm__ ("eprol");
extern void start __P((void)) __asm__ ("start");
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#if defined(sun) && defined(sparc)
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static void __call __P((void));
#endif
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#ifdef __NetBSD__
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#undef mmap
#define mmap(addr, len, prot, flags, fd, off) \
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__syscall2((quad_t)SYS_mmap, (addr), (len), (prot), (flags), \
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(fd), 0, (off_t)(off))
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extern int __syscall2 __P((quad_t, ...));
#endif
__asm__("
.text
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.align 4
.global start
start:
");
/*
* Set up `argc', `argv', and `envp' into local registers.
*/
__asm__("
mov 0, %fp
ld [%sp + 64], %l0 ! get argc
add %sp, 68, %l1 ! get argv
sll %l0, 2, %l2 !
add %l2, 4, %l2 ! envp = argv + (argc << 2) + 4
add %l1, %l2, %l2 !
sethi %hi(_environ), %l3
st %l2, [%l3+%lo(_environ)] ! *environ = l2
");
/*
* We get a pointer to PSSTRINGS in %g1.
*/
__asm__("
cmp %g1, 0
be 1f
sethi %hi(___ps_strings), %l3
st %g1, [%l3+%lo(___ps_strings)]
1:
");
/*
* Finish diddling with stack.
*/
__asm__("
andn %sp, 7, %sp ! align
sub %sp, 24, %sp ! expand to standard stack frame size
");
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/*
* Set __progname:
* if (argv[0])
* if ((__progname = _strrchr(argv[0], '/')) == NULL)
* __progname = argv[0];
* else
* ++__progname;
*/
__asm__("
ld [%l1], %o0
cmp %o0, 0
mov %o0, %l6
be 1f
sethi %hi(___progname), %l7
");
#ifdef DYNAMIC
__asm__("call __strrchr");
#else
__asm__("call _strrchr");
#endif
__asm__("
mov 47, %o1
cmp %o0, 0
be,a 1f
st %l6, [%l7+%lo(___progname)]
add %o0, 1, %o0
st %o0, [%l7+%lo(___progname)]
1:
");
#ifdef DYNAMIC
/* Resolve symbols in dynamic libraries */
__asm__("
sethi %hi(__DYNAMIC), %o0
orcc %o0, %lo(__DYNAMIC), %o0
be 1f
nop
call ___load_rtld
nop
1:
");
#endif
/* From here, all symbols should have been resolved, so we can use libc */
#ifdef MCRT0
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/*
* atexit(_mcleanup);
* monstartup((u_long)&eprol, (u_long)&etext);
*/
__asm__("
sethi %hi(__mcleanup), %o0
call _atexit
or %o0, %lo(__mcleanup), %o0
sethi %hi(_eprol), %o0
or %o0, %lo(_eprol), %o0
sethi %hi(_etext), %o1
call _monstartup
or %o1, %lo(_etext), %o1
");
#endif
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#ifdef sun
/*
* SunOS compatibility
*/
__asm__("
call start_float
nop
");
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#endif
/*
* Move `argc', `argv', and `envp' from locals to parameters for `main'.
*/
__asm__("
mov %l0,%o0
mov %l1,%o1
__callmain:
call _main
mov %l2,%o2
call _exit
nop
");
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#ifdef DYNAMIC
/*
* System call entry
*/
__asm__("
.set SYSCALL_G2RFLAG, 0x400
.set SYS___syscall, 198
___syscall2:
sethi %hi(SYS___syscall), %g1
ba 1f
or %g1, %lo(SYS___syscall), %g1
___syscall:
clr %g1
1:
or %g1, SYSCALL_G2RFLAG, %g1
add %o7, 8, %g2
ta %g0
mov -0x1, %o0
jmp %o7 + 0x8
mov -0x1, %o1
");
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#endif
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#ifdef sun
static
__call()
{
/*
* adjust the C generated pointer to the crt struct to the
* likings of ld.so, which is an offset relative to its %fp
*/
__asm__("
mov %i0, %o0
mov %i1, %o1
call %i2
sub %o1, %sp, %o1
");
/*NOTREACHED, control is transferred directly to our caller */
}
#endif
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#include "common.c"
#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: crt0.c,v 1.26 1998/09/05 13:20:08 pk Exp $");
#endif /* LIBC_SCCS and not lint */
#ifdef MCRT0
__asm__ ("
.text
_eprol:
");
#endif