52b05d6607
When ifuncs are used in statically linked binaries, the C runtime must perform the needed dynamic relocations, to make calls to ifuncs work correctly. Reviewed by: jhibbits Differential Revision: https://reviews.freebsd.org/D21070
136 lines
3.9 KiB
C
136 lines
3.9 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 <stdint.h>
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#include <sys/elf.h>
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static uint32_t cpu_features;
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static uint32_t cpu_features2;
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#include "libc_private.h"
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#include "crtbrand.c"
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#include "ignore_init.c"
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struct Struct_Obj_Entry;
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struct ps_strings;
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extern void _start(int, char **, char **, const struct Struct_Obj_Entry *,
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void (*)(void), struct ps_strings *);
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#ifdef GCRT
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extern void _mcleanup(void);
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extern void monstartup(void *, void *);
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extern int eprol;
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extern int etext;
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#endif
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struct ps_strings *__ps_strings;
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static void
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init_cpu_features(char **env)
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{
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const Elf_Auxinfo *aux;
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/* Find the auxiliary vector on the stack. */
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while (*env++ != 0) /* Skip over environment, and NULL terminator */
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;
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aux = (const Elf_Auxinfo *)env;
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/* Digest the auxiliary vector. */
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for (; aux->a_type != AT_NULL; aux++) {
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switch (aux->a_type) {
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case AT_HWCAP:
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cpu_features = (uint32_t)aux->a_un.a_val;
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break;
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case AT_HWCAP2:
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cpu_features2 = (uint32_t)aux->a_un.a_val;
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break;
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}
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}
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}
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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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handle_argv(argc, argv, env);
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if (ps_strings != (struct ps_strings *)0)
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__ps_strings = ps_strings;
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if (&_DYNAMIC != NULL)
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atexit(cleanup);
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else {
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init_cpu_features(env);
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process_irelocs();
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_init_tls();
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}
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#ifdef GCRT
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atexit(_mcleanup);
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monstartup(&eprol, &etext);
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#endif
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handle_static_init(argc, argv, env);
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exit(main(argc, argv, env));
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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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