187 lines
5.2 KiB
C
187 lines
5.2 KiB
C
/* $NetBSD: crt0.c,v 1.16 1996/10/18 05:36:58 thorpej 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[] = "$NetBSD: crt0.c,v 1.16 1996/10/18 05:36:58 thorpej 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 __P((void)) asm("start");
|
|
|
|
#if defined(sun) && defined(sparc)
|
|
static void __call __P((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 __P((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
|