void
rebootcmd(int argc, char *argv[])
{
Chan *c;
Exec exec;
ulong magic, text, rtext, entry, data, size;
uchar *p;
if(argc == 0)
exit(0);
c = namec(argv[0], Aopen, OEXEC, 0);
if(waserror()){
cclose(c);
nexterror();
}
readn(c, &exec, sizeof(Exec));
magic = l2be(exec.magic);
entry = l2be(exec.entry);
text = l2be(exec.text);
data = l2be(exec.data);
if(magic != AOUT_MAGIC)
error(Ebadexec);
/* round text out to page boundary */
rtext = ROUNDUP(entry+text, PGSZ)-entry;
size = rtext + data;
p = malloc(size);
if(p == nil)
error(Enomem);
if(waserror()){
free(p);
nexterror();
}
memset(p, 0, size);
readn(c, p, text);
readn(c, p + rtext, data);
ksetenv("bootfile", argv[0], 1);
setbootcmd(argc-1, argv+1);
reboot((void*)entry, p, size);
panic("return from reboot!");
}
void
rebootcmd(int argc, char *argv[])
{
Chan *c;
Exec exec;
Execvals ev;
ulong magic, text, rtext, entry, data, size;
uchar *p;
if(argc == 0)
exit(0);
c = namec(argv[0], Aopen, OEXEC, 0);
if(waserror()){
cclose(c);
nexterror();
}
readn(c, &exec, sizeof(Exec));
magic = l2be(exec.magic);
/*
* AOUT_MAGIC is sometimes defined like this:
* #define AOUT_MAGIC V_MAGIC || magic==M_MAGIC
* so we can only use it in a fairly stylized manner.
*/
if(magic == AOUT_MAGIC) {
entry = l2be(exec.entry);
text = l2be(exec.text);
data = l2be(exec.data);
} else if(parseboothdr && (*parseboothdr)(c, magic, &ev) >= 0 ||
readelfhdr(c, magic, &ev) >= 0 ||
readelf64hdr(c, magic, &ev) >= 0){
entry = ev.entry;
text = ev.textsize;
data = ev.datasize;
} else {
error(Ebadexec);
return; /* for the compiler */
}
/* round text out to page boundary */
rtext = ROUNDUP(entry+text, BY2PG) - entry;
size = rtext + data;
p = malloc(size);
if(p == nil)
error(Enomem);
if(waserror()){
free(p);
nexterror();
}
memset(p, 0, size);
readn(c, p, text);
readn(c, p + rtext, data);
ksetenv("bootfile", argv[0], 1);
setbootcmd(argc-1, argv+1);
reboot((void*)entry, p, size);
panic("return from reboot!");
}
