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/* $OpenBSD: boot.c,v 1.2 1997/07/21 06:58:12 pefo Exp $ */
/*
* Copyright (c) 1997 Per Fogelstrom
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed under OpenBSD by
* Per Fogelstrom.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <stand.h>
#include <errno.h>
void gets __P((char *));
ssize_t read __P((int, void *, size_t));
int close __P((int));
void prom_write __P((int, char *, int));
void main __P((int, char **));
int loadfile __P((char *));
/*
*/
void
main(argc, argv)
int argc;
char **argv;
{
static char boot[] = {"Boot:"};
char *cp = boot;
int ask, entry;
char line[1024];
ask = 1;
if(strcmp(argv[0], "man") != 0) {
cp = argv[0];
ask = 0;
}
while(1) {
do {
printf("%s\n", cp);
if (ask) {
gets(line);
cp = line;
argv[0] = cp;
argc = 1;
}
} while(ask && line[0] == '\0');
entry = loadfile(cp);
if (entry != -1) {
((void (*)())entry)(argc, argv, 0, 0);
}
ask = 1;
cp = boot;
}
}
/*
* Open 'filename', read in program and return the entry point or -1 if error.
*/
int
loadfile(fname)
register char *fname;
{
int fd, i;
Elf32_Ehdr eh;
Elf32_Phdr *ph;
u_long phsize;
char *errs = 0;
if ((fd = oopen(fname, 0)) < 0) {
errs="open(%s) err: %d\n";
goto err;
}
/* read the elf header */
if(oread(fd, (char *)&eh, sizeof(eh)) != sizeof(eh)) {
goto serr;
}
phsize = eh.e_phnum * sizeof(Elf32_Phdr);
ph = (Elf32_Phdr *) alloc(phsize);
olseek(fd, eh.e_phoff, 0);
if(oread(fd, (char *)ph, phsize) != phsize) {
goto serr;
}
for(i = 0; i < eh.e_phnum; i++, ph++) {
if(ph->p_type == PT_LOAD) {
olseek(fd, ph->p_offset, 0);
if(oread(fd, (char *)ph->p_paddr, ph->p_filesz) != ph->p_filesz) {
goto serr;
}
}
}
return(eh.e_entry);
serr:
errs = "rd(%s) sz err\n";
err:
printf(errs, fname, errno);
return (-1);
}
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