* Removed startup code patches in lib/csu regarding kernel to userland ABI. * Aligned stack layout on NetBSD stack layout. * Generate valid stack pointers instead of offsets by taking into account _minix_kerninfo->kinfo->user_sp. * Refactored stack generation, by moving part of execve in two functions {minix_stack_params(), minix_stack_fill()} and using them in execve(), rs and vm. * Changed load offset of rtld (ld.so) to: execi.args.stack_high - execi.args.stack_size - 0xa00000 which is 10MB below the main executable stack. Change-Id: I839daf3de43321cded44105634102d419cb36cec
172 lines
5.1 KiB
C
172 lines
5.1 KiB
C
/* $NetBSD: crt0-common.c,v 1.9 2012/08/13 02:15:35 matt Exp $ */
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/*
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* Copyright (c) 1998 Christos Zoulas
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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 <sys/cdefs.h>
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__RCSID("$NetBSD: crt0-common.c,v 1.9 2012/08/13 02:15:35 matt Exp $");
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#include <sys/types.h>
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#include <sys/exec.h>
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#ifndef __minix
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#include <sys/syscall.h>
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#else
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#include <string.h>
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#endif
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#include <machine/profile.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "rtld.h"
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extern int main(int, char **, char **);
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#ifndef HAVE_INITFINI_ARRAY
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extern void _init(void);
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extern void _fini(void);
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#endif
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extern void _libc_init(void);
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/*
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* Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
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* as being at address zero, unless something else defines it). That way,
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* if we happen to be compiling without -static but with without any
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* shared libs present, things will still work.
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*/
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__weakref_visible int rtld_DYNAMIC __weak_reference(_DYNAMIC);
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#ifdef MCRT0
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extern void monstartup(u_long, u_long);
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extern void _mcleanup(void);
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extern unsigned char __etext, __eprol;
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#endif /* MCRT0 */
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char **environ;
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struct ps_strings *__ps_strings = 0;
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static char empty_string[] = "";
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char *__progname = empty_string;
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__dead __dso_hidden void ___start(void (*)(void), const Obj_Entry *,
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struct ps_strings *);
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#ifndef __minix
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#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
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#else
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#define write(fd, s, n) /* NO write() from here on minix */
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#endif
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#define _FATAL(str) \
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do { \
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write(2, str, sizeof(str)-1); \
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_exit(1); \
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} while (0)
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#ifdef HAVE_INITFINI_ARRAY
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/*
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* If we are using INIT_ARRAY/FINI_ARRAY and we are linked statically,
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* we have to process these instead of relying on RTLD to do it for us.
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*
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* Since we don't need .init or .fini sections, just code them in C
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* to make life easier.
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*/
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static const fptr_t init_array_start[] __weak_reference(__init_array_start);
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static const fptr_t init_array_end[] __weak_reference(__init_array_end);
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static const fptr_t fini_array_start[] __weak_reference(__fini_array_start);
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static const fptr_t fini_array_end[] __weak_reference(__fini_array_end);
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static inline void
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_init(void)
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{
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for (const fptr_t *f = init_array_start; f < init_array_end; f++) {
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(*f)();
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}
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}
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static void
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_fini(void)
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{
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for (const fptr_t *f = fini_array_start; f < fini_array_end; f++) {
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(*f)();
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}
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}
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#endif /* HAVE_INITFINI_ARRAY */
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void
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___start(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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if (ps_strings == NULL)
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_FATAL("ps_strings missing\n");
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__ps_strings = ps_strings;
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environ = ps_strings->ps_envstr;
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if (ps_strings->ps_argvstr[0] != NULL) {
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char *c;
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__progname = ps_strings->ps_argvstr[0];
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for (c = ps_strings->ps_argvstr[0]; *c; ++c) {
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if (*c == '/')
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__progname = c + 1;
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}
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} else {
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__progname = empty_string;
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}
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if (&rtld_DYNAMIC != NULL) {
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if (obj == NULL)
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_FATAL("NULL Obj_Entry pointer in GOT\n");
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if (obj->magic != RTLD_MAGIC)
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_FATAL("Corrupt Obj_Entry pointer in GOT\n");
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if (obj->version != RTLD_VERSION)
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_FATAL("Dynamic linker version mismatch\n");
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atexit(cleanup);
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}
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_libc_init();
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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(ps_strings->ps_nargvstr, ps_strings->ps_argvstr, environ));
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}
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