187 lines
5.2 KiB
C
187 lines
5.2 KiB
C
/* $NetBSD: crt0.c,v 1.15 1995/06/15 21:41:55 pk Exp $ */
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Erasmus) %G%";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <stdlib.h>
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#include "common.h"
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extern unsigned char etext;
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extern unsigned char eprol asm ("eprol");
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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));
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#endif
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#ifdef BSD
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#undef mmap
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#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, ...));
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#endif
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asm (" .global start");
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asm (" .text");
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asm (" start:");
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/* Set up `argc', `argv', and `envp' into local registers (from GNU Emacs). */
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asm (" mov 0, %fp");
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asm (" ld [%sp + 64], %l0"); /* argc */
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asm (" add %sp, 68, %l1"); /* argv */
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asm (" sll %l0, 2, %l2"); /**/
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asm (" add %l2, 4, %l2"); /* envp = argv + (argc << 2) + 4 */
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asm (" add %l1, %l2, %l2"); /**/
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asm (" sethi %hi(_environ), %l3");
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asm (" st %l2, [%l3+%lo(_environ)]"); /* *environ = l2 */
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/* Finish diddling with stack. */
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asm (" andn %sp, 7, %sp");
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asm (" sub %sp, 24, %sp");
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/*
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* Set __progname:
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* if (argv[0])
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* if ((__progname = _strrchr(argv[0], '/')) == NULL)
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* __progname = argv[0];
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* else
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* ++__progname;
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*/
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asm (" ld [%l1], %o0");
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asm (" cmp %o0, 0");
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asm (" mov %o0, %l6");
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asm (" be 1f");
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asm (" sethi %hi(___progname), %l7");
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#ifdef DYNAMIC
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asm (" call __strrchr");
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#else
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asm (" call _strrchr");
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#endif
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asm (" mov 47, %o1");
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asm (" cmp %o0, 0");
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asm (" be,a 1f");
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asm (" st %l6, [%l7+%lo(___progname)]");
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asm (" add %o0, 1, %o0");
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asm (" st %o0, [%l7+%lo(___progname)]");
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asm ("1:");
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#ifdef DYNAMIC
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/* Resolve symbols in dynamic libraries */
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asm (" sethi %hi(__DYNAMIC), %o0");
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asm (" orcc %o0, %lo(__DYNAMIC), %o0");
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asm (" be 1f");
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asm (" nop");
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asm (" call ___load_rtld");
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asm (" nop");
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asm ("1:");
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#endif
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/* From here, all symbols should have been resolved, so we can use libc */
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#ifdef MCRT0
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/*
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* atexit(_mcleanup);
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* monstartup((u_long)&eprol, (u_long)&etext);
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*/
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asm (" sethi %hi(__mcleanup), %o0");
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asm (" call _atexit");
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asm (" or %o0, %lo(__mcleanup), %o0");
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asm (" sethi %hi(_eprol), %o0");
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asm (" or %o0, %lo(_eprol), %o0");
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asm (" sethi %hi(_etext), %o1");
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asm (" call _monstartup");
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asm (" or %o1, %lo(_etext), %o1");
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#endif
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#ifdef sun
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/* SunOS compatibility */
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asm (" call start_float");
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asm (" nop");
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#endif
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/* Move `argc', `argv', and `envp' from locals to parameters for `main'. */
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asm (" mov %l0,%o0");
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asm (" mov %l1,%o1");
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asm ("__callmain:"); /* Defined for the benefit of debuggers */
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asm (" call _main");
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asm (" mov %l2,%o2");
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asm (" call _exit");
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asm (" nop");
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#ifdef DYNAMIC
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/* System call entry */
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asm(" .set SYSCALL_G2RFLAG, 0x400");
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asm(" .set SYS___syscall, 198");
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asm("___syscall2:");
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asm(" sethi %hi(SYS___syscall), %g1"); /* `SYS___syscall' */
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asm(" ba 1f");
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asm(" or %g1, %lo(SYS___syscall), %g1");
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asm("___syscall:");
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asm(" clr %g1"); /* `SYS_syscall' */
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asm("1:");
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asm(" or %g1, SYSCALL_G2RFLAG, %g1"); /* Use quick return */
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asm(" add %o7, 8, %g2");
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asm(" ta %g0");
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asm(" mov -0x1, %o0"); /* Note: no `errno' */
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asm(" jmp %o7 + 0x8");
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asm(" mov -0x1, %o1");
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#endif
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#ifdef sun
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static
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__call()
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{
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/*
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* adjust the C generated pointer to the crt struct to the
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* likings of ld.so, which is an offset relative to its %fp
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*/
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asm("mov %i0, %o0");
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asm("mov %i1, %o1");
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asm("call %i2");
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asm("sub %o1, %sp, %o1");
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/*NOTREACHED, control is transferred directly to our caller */
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}
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#endif
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#include "common.c"
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#ifdef MCRT0
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asm (" .text");
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asm ("_eprol:");
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#endif
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