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/* $OpenBSD: crt0.c,v 1.4 2002/02/16 21:27:20 millert Exp $ */
/* $NetBSD: crt0.c,v 1.15 1995/06/15 21:41:55 pk Exp $ */
/*
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
* 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:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: crt0.c,v 1.4 2002/02/16 21:27:20 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <stdlib.h>
#include "common.h"
extern unsigned char etext;
extern unsigned char eprol asm ("eprol");
extern void start(void) asm("start");
#if defined(sun) && defined(sparc)
static void __call(void);
#endif
#ifdef BSD
#undef mmap
#define mmap(addr, len, prot, flags, fd, off) \
__syscall2((quad_t)SYS_mmap, (addr), (len), (prot), (flags), \
(fd), 0, (off_t)(off))
extern int __syscall2(quad_t, ...);
#endif
asm (" .global start");
asm (" .text");
asm (" start:");
/* Set up `argc', `argv', and `envp' into local registers (from GNU Emacs). */
asm (" mov 0, %fp");
asm (" ld [%sp + 64], %l0"); /* argc */
asm (" add %sp, 68, %l1"); /* argv */
asm (" sll %l0, 2, %l2"); /**/
asm (" add %l2, 4, %l2"); /* envp = argv + (argc << 2) + 4 */
asm (" add %l1, %l2, %l2"); /**/
asm (" sethi %hi(_environ), %l3");
asm (" st %l2, [%l3+%lo(_environ)]"); /* *environ = l2 */
/* Finish diddling with stack. */
asm (" andn %sp, 7, %sp");
asm (" sub %sp, 24, %sp");
/*
* Set __progname:
* if (argv[0])
* if ((__progname = _strrchr(argv[0], '/')) == NULL)
* __progname = argv[0];
* else
* ++__progname;
*/
asm (" ld [%l1], %o0");
asm (" cmp %o0, 0");
asm (" mov %o0, %l6");
asm (" be 1f");
asm (" sethi %hi(___progname), %l7");
#ifdef DYNAMIC
asm (" call __strrchr");
#else
asm (" call _strrchr");
#endif
asm (" mov 47, %o1");
asm (" cmp %o0, 0");
asm (" be,a 1f");
asm (" st %l6, [%l7+%lo(___progname)]");
asm (" add %o0, 1, %o0");
asm (" st %o0, [%l7+%lo(___progname)]");
asm ("1:");
#ifdef DYNAMIC
/* Resolve symbols in dynamic libraries */
asm (" sethi %hi(__DYNAMIC), %o0");
asm (" orcc %o0, %lo(__DYNAMIC), %o0");
asm (" be 1f");
asm (" nop");
asm (" call ___load_rtld");
asm (" nop");
asm ("1:");
#endif
/* From here, all symbols should have been resolved, so we can use libc */
#ifdef MCRT0
/*
* atexit(_mcleanup);
* monstartup((u_long)&eprol, (u_long)&etext);
*/
asm (" sethi %hi(__mcleanup), %o0");
asm (" call _atexit");
asm (" or %o0, %lo(__mcleanup), %o0");
asm (" sethi %hi(_eprol), %o0");
asm (" or %o0, %lo(_eprol), %o0");
asm (" sethi %hi(_etext), %o1");
asm (" call _monstartup");
asm (" or %o1, %lo(_etext), %o1");
#endif
#ifdef sun
/* SunOS compatibility */
asm (" call start_float");
asm (" nop");
#endif
/* Move `argc', `argv', and `envp' from locals to parameters for `main'. */
asm (" mov %l0,%o0");
asm (" mov %l1,%o1");
asm ("__callmain:"); /* Defined for the benefit of debuggers */
asm (" call _main");
asm (" mov %l2,%o2");
asm (" call _exit");
asm (" nop");
#ifdef DYNAMIC
/* System call entry */
asm(" .set SYSCALL_G2RFLAG, 0x400");
asm(" .set SYS___syscall, 198");
asm("___syscall2:");
asm(" sethi %hi(SYS___syscall), %g1"); /* `SYS___syscall' */
asm(" ba 1f");
asm(" or %g1, %lo(SYS___syscall), %g1");
asm("___syscall:");
asm(" clr %g1"); /* `SYS_syscall' */
asm("1:");
asm(" or %g1, SYSCALL_G2RFLAG, %g1"); /* Use quick return */
asm(" add %o7, 8, %g2");
asm(" ta %g0");
asm(" mov -0x1, %o0"); /* Note: no `errno' */
asm(" jmp %o7 + 0x8");
asm(" mov -0x1, %o1");
#endif
#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");
asm("mov %i1, %o1");
asm("call %i2");
asm("sub %o1, %sp, %o1");
/*NOTREACHED, control is transferred directly to our caller */
}
#endif
#include "common.c"
#ifdef MCRT0
asm (" .text");
asm ("_eprol:");
#endif
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