100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. 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 Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI doscmd_loader.c,v 2.3 1996/04/08 19:32:33 bostic Exp
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <a.out.h>
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/*
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* reserve space in "low" memory for the interrupt vector table
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*/
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static const char filler[4096] = { 0, };
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#define _PATH_DOS_KERNEL_DIR "/usr/libexec/"
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#define _PATH_DOS_KERNEL "doscmd.kernel"
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int
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load_kernel(void)
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{
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FILE *fp;
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struct exec exec;
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int start_address;
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if ((fp = fopen(_PATH_DOS_KERNEL, "r")) == NULL &&
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(fp = fopen("obj/" _PATH_DOS_KERNEL, "r")) == NULL &&
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(fp = fopen(_PATH_DOS_KERNEL_DIR _PATH_DOS_KERNEL, "r")) == NULL &&
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(fp = fopen(getenv("DOS_KERNEL"), "r")) == NULL)
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err(1, "load_kernel");
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if (fread(&exec, sizeof(exec), 1, fp) != 1 || N_GETMAGIC(exec) != OMAGIC)
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errx(1, "bad kernel file format");
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start_address = exec.a_entry & (~(getpagesize() - 1));
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if (brk(start_address + exec.a_text + exec.a_data + exec.a_bss) < 0)
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err(1, "load_kernel");
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fread((char *)start_address, exec.a_text + exec.a_data, 1, fp);
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bzero((char *)(start_address + exec.a_text + exec.a_data), exec.a_bss);
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fclose(fp);
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return(exec.a_entry);
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}
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void
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main(int argc, char **argv, char **environ)
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{
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void (*entry_point)();
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#ifndef __FreeBSD__
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int fd = open("/dev/mem", 0);
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#endif
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setgid(getgid());
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setuid(getuid());
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#ifndef __FreeBSD__
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if (fd < 0)
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err(1, "/dev/mem");
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#endif
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entry_point = (void (*)()) load_kernel();
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#ifndef __FreeBSD__
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if (read(fd, 0, 0x500 != 0x500))
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err(1, "/dev/mem");
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close(fd);
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#endif
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(*entry_point)(argc, argv, environ);
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errx(1, "return from doscmd kernel???");
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}
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