/* $NetBSD: netbsd32_mod.c,v 1.23 2020/08/08 19:08:48 christos Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* Copyright (c) 1998, 2000, 2017 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum, and by Maxime Villard.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netbsd32_mod.c,v 1.23 2020/08/08 19:08:48 christos Exp $");
#ifdef _KERNEL_OPT
#include "opt_execfmt.h"
#endif
#ifndef ELFSIZE
#define ELFSIZE ARCH_ELFSIZE
#endif
#include <sys/param.h>
#include <sys/module.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/module_hook.h>
#include <sys/compat_stub.h>
#include <compat/netbsd32/netbsd32_sysctl.h>
#include <compat/netbsd32/netbsd32_kern_proc.h>
#include <compat/netbsd32/netbsd32_exec.h>
#define ELF32_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux32Info), \
sizeof(Elf32_Addr)) + MAXPATHLEN + ALIGN(1))
struct compat32_80_modctl_hook_t compat32_80_modctl_hook;
# define DEPS1 "ksem,compat_util"
#if defined(EXEC_ELF32)
# define DEPS2 ",exec_elf32"
#else
# define DEPS2 ""
#endif
MODULE(MODULE_CLASS_EXEC, compat_netbsd32, DEPS1 DEPS2);
static struct execsw netbsd32_execsw[] = {
#ifdef EXEC_AOUT
{
.es_hdrsz = sizeof(struct netbsd32_exec),
.es_makecmds = exec_netbsd32_makecmds,
.u = {
.elf_probe_func = NULL,
},
.es_emul = &emul_netbsd32,
.es_prio = EXECSW_PRIO_FIRST,
.es_arglen = 0,
.es_copyargs = netbsd32_copyargs,
.es_setregs = NULL,
.es_coredump = coredump_netbsd32,
.es_setup_stack = exec_setup_stack,
},
#endif
#ifdef EXEC_ELF32
{
.es_hdrsz = sizeof (Elf32_Ehdr),
.es_makecmds = exec_elf32_makecmds,
.u = {
.elf_probe_func = netbsd32_elf32_probe,
},
.es_emul = &emul_netbsd32,
.es_prio = EXECSW_PRIO_ANY,
.es_arglen = ELF32_AUXSIZE,
.es_copyargs = netbsd32_elf32_copyargs,
.es_setregs = NULL,
.es_coredump = coredump_elf32,
.es_setup_stack = exec_setup_stack,
},
#endif
};
#if defined(__amd64__)
#include <x86/cpu.h>
/* This code was moved here, from $SRC/arch/amd64/amd64/trap.c */
static int
amd64_oosyscall_handle(struct proc *p, struct trapframe *frame)
{
int error = EPASSTHROUGH;
#define LCALLSZ 7
/* Check for the oosyscall lcall instruction. */
if (p->p_emul == &emul_netbsd32 &&
frame->tf_rip < VM_MAXUSER_ADDRESS32 - LCALLSZ &&
(error = x86_cpu_is_lcall((void *)frame->tf_rip)) == 0)
{
/* Advance past the lcall and save instruction size. */
frame->tf_rip += LCALLSZ;
frame->tf_err = LCALLSZ;
return 0;
}
return error;
}
#endif /* defined(__amd64__) */
static int
compat_netbsd32_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = exec_add(netbsd32_execsw,
__arraycount(netbsd32_execsw));
if (error == 0) {
netbsd32_machdep_md_init();
netbsd32_kern_proc_32_init();
#if defined(__amd64__)
MODULE_HOOK_SET(amd64_oosyscall_hook,
amd64_oosyscall_handle);
#endif /* defined(__amd64__) */
}
return error;
case MODULE_CMD_FINI:
#if defined(__amd64__)
MODULE_HOOK_UNSET(amd64_oosyscall_hook);
#endif /* defined(__amd64__) */
netbsd32_machdep_md_fini();
netbsd32_sysctl_fini();
netbsd32_kern_proc_32_fini();
error = exec_remove(netbsd32_execsw,
__arraycount(netbsd32_execsw));
if (error) {
netbsd32_kern_proc_32_init();
netbsd32_machdep_md_init();
#if defined(__amd64__)
MODULE_HOOK_SET(amd64_oosyscall_hook,
amd64_oosyscall_handle);
#endif /* defined(__amd64__) */
}
return error;
default:
return ENOTTY;
}
}