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/* $OpenBSD: loadfile_subr.c,v 1.3 2013/03/21 21:50:59 deraadt Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <lib/libkern/libkern.h>
#include <sys/exec_elf.h>
#include <lib/libsa/loadfile.h>
#include <machine/alpha_cpu.h>
#include <machine/rpb.h>
#define ptoa(a) ((a) << PAGE_SHIFT)
/*
* Prevent loading a kernel if it would overlap the SRM.
*/
int
check_phdr(void *hdr)
{
Elf64_Phdr *phdr = (Elf64_Phdr *)hdr;
struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
struct mddt *mddtp;
struct mddt_cluster *memc;
u_int64_t cstart, cend;
u_int64_t i;
mddtp = (struct mddt *)(((caddr_t)hwrpb) + hwrpb->rpb_memdat_off);
for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
memc = &mddtp->mddt_clusters[i];
if (memc->mddt_usage & MDDT_PALCODE) {
cstart = ALPHA_PHYS_TO_K0SEG(ptoa(memc->mddt_pfn));
cend = cstart + ptoa(memc->mddt_pg_cnt);
if (phdr->p_vaddr + phdr->p_memsz <= cstart ||
phdr->p_vaddr >= cend)
continue;
printf("SRM console and kernel image would overlap.\n"
"Please report this to <alpha@openbsd.org>, "
"with the following values:\n"
"SRM range: %p-%p\n"
"kernel range: %p-%p\n",
cstart, cend, phdr->p_vaddr,
phdr->p_vaddr + phdr->p_memsz);
return 1;
}
}
return 0;
}
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