51015e6d0f
Why? Most trivial point, it shaves around 600 bytes from the dynamic binaries on amd64. Less trivial, the removed code is no longer part of the ABI, and we can ship updates to it with libc updates. Right now most of the csu is linked into the binaries and require us to do somewhat tricky ABI compat when it needs to change. For instance, the init_array change would be much simpler and does not require note tagging if we have init calling code in libc. This could be improved more, by splitting dynamic and static initialization. For instance, &_DYNAMIC tests can be removed then. Such change, nonetheless, would require building libc three times. I left this for later, after this change stabilizes, if ever. Reviewed by: markj Discussed with: jrtc27 (some objections, see the review), imp Tested by: markj (aarch64) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D37220
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/* LINTLIBRARY */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright 2001 David E. O'Brien.
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* All rights reserved.
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* Copyright 1996-1998 John D. Polstra.
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* All rights reserved.
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* Copyright (c) 1997 Jason R. Thorpe.
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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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* FreeBSD Project. See https://www.freebsd.org/ for
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* information about FreeBSD.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdlib.h>
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#include "libc_private.h"
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#include "csu_common.h"
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struct Struct_Obj_Entry;
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struct ps_strings;
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struct ps_strings *__ps_strings;
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void _start(int, char **, char **, const struct Struct_Obj_Entry *,
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void (*)(void), struct ps_strings *) __dead2;
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/* The entry function. */
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/*
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* First 5 arguments are specified by the PowerPC SVR4 ABI.
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* The last argument, ps_strings, is a BSD extension.
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*/
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/* ARGSUSED */
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void
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_start(int argc, char **argv, char **env,
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const struct Struct_Obj_Entry *obj __unused, void (*cleanup)(void),
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struct ps_strings *ps_strings)
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{
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if (ps_strings != (struct ps_strings *)0)
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__ps_strings = ps_strings;
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#ifdef GCRT
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__libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext);
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#else
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__libc_start1(argc, argv, env, cleanup, main);
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#endif
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}
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#ifdef GCRT
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__asm__(".text");
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__asm__("eprol:");
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__asm__(".previous");
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#endif
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#ifndef PIC
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__asm__(".text\n"
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"\t.global _GLOBAL_OFFSET_TABLE_\n"
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"\t.reloc 0, R_PPC_NONE, _GLOBAL_OFFSET_TABLE_");
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#endif
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