/*      $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;
       }
}

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