e83f7ba2c9
. file- and functionality-compatible with previous situation
(FreeBSD csu) (with a crt1.o -> crt0.o symlink in /usr/lib)
. harmonizes source with netbsd
. harmonizes linker invocation (e.g. clang) with netbsd
. helpful to get some arm code in there for the arm port project
120 lines
3.9 KiB
C
120 lines
3.9 KiB
C
/* $NetBSD: crt0.c,v 1.24 2005/12/24 21:38:40 perry Exp $ */
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/*
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* Copyright (c) 1995 Christopher G. Demetriou
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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 for the
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* NetBSD Project. See http://www.NetBSD.org/ for
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* information about NetBSD.
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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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* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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*/
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#include "common.h"
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/*
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* __start needs to gather up argc, argv, env_p, ps_strings, the termination
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* routine passed in %g1 and call ___start to finish up the startup processing.
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*
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* NB: We are violating the ELF spec by passing a pointer to the ps strings in
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* %g1 instead of a termination routine.
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*/
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__asm("\n\
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.data\n\
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__data_start: ! Start of data section\n\
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.text\n\
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.align 4\n\
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.global _start\n\
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.global __start\n\
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.register %g3,#scratch\n\
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.register %g2,#scratch\n\
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_start:\n\
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__start:\n\
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setx __data_start, %o0, %g4 ! Point %g4 to start of data section\n\
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clr %g4 ! egcs thinks this is zero. XXX\n\
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clr %fp\n\
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add %sp, 8*16 + 0x7ff, %o0 ! start of stack\n\
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mov %g1, %o1 ! Cleanup routine\n\
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mov %g3, %o1 ! XXXX our rtld uses %g3\n\
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mov %g2, %o2 ! XXXX obj from rtld.\n\
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ba,pt %icc, ___start ! XXXX jump over the retl egcs 2.96 inserts\n\
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mov %g1, %o3 ! ps_strings XXXX\n\
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");
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void ___start(char **, void (*cleanup)(void), const Obj_Entry *,
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struct ps_strings *);
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void
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___start(char **sp,
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void (*cleanup)(void), /* from shared loader */
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const Obj_Entry *obj, /* from shared loader */
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struct ps_strings *ps_strings)
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{
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long argc;
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char **argv, *namep;
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argc = *(long *)sp;
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argv = sp + 1;
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environ = sp + 2 + argc; /* 2: argc + NULL ending argv */
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if ((namep = argv[0]) != NULL) { /* NULL ptr if argc = 0 */
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if ((__progname = _strrchr(namep, '/')) == NULL)
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__progname = namep;
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else
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__progname++;
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}
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if (ps_strings != (struct ps_strings *)0 &&
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ps_strings != (struct ps_strings *)0xbabefacedeadbeef)
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__ps_strings = ps_strings;
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#ifdef DYNAMIC
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if (&_DYNAMIC != NULL)
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_rtld_setup(cleanup, obj);
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#endif
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#ifdef MCRT0
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atexit(_mcleanup);
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monstartup((u_long)&_eprol, (u_long)&_etext);
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#endif
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atexit(_fini);
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_init();
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exit(main(argc, argv, environ));
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}
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/*
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* NOTE: Leave the RCS ID _after_ _start(), in case it gets placed in .text.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: crt0.c,v 1.24 2005/12/24 21:38:40 perry Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "common.c"
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