/*      $NetBSD: linux_exec_aout.c,v 1.68 2015/10/18 16:59:19 maxv Exp $        */

/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz.
*
* 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.
*/

/*
* based on exec_aout.c, sunos_exec.c and svr4_exec.c
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.68 2015/10/18 16:59:19 maxv Exp $");

#ifdef _KERNEL_OPT
#include "opt_execfmt.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/exec.h>

#include <sys/mman.h>
#include <sys/syscallargs.h>

#include <sys/cpu.h>
#include <machine/reg.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_exec.h>
#include <compat/linux/common/linux_machdep.h>

#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_syscall.h>

int linux_aout_copyargs(struct lwp *, struct exec_package *,
   struct ps_strings *, char **, void *);

static int exec_linux_aout_prep_zmagic(struct lwp *,
   struct exec_package *);
static int exec_linux_aout_prep_nmagic(struct lwp *,
   struct exec_package *);
static int exec_linux_aout_prep_omagic(struct lwp *,
   struct exec_package *);
static int exec_linux_aout_prep_qmagic(struct lwp *,
   struct exec_package *);

int
linux_aout_copyargs(struct lwp *l, struct exec_package *pack,
   struct ps_strings *arginfo, char **stackp, void *argp)
{
       char **cpp = (char **)*stackp;
       char **stk = (char **)*stackp;
       char *dp, *sp;
       size_t len;
       void *nullp = NULL;
       int argc = arginfo->ps_nargvstr;
       int envc = arginfo->ps_nenvstr;
       int error;

       if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0)
               return error;

       /* leave room for envp and argv */
       cpp += 2;
       if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0)
               return error;

       dp = (char *) (cpp + argc + envc + 2);
       sp = argp;

       /* XXX don't copy them out, remap them! */
       arginfo->ps_argvstr = cpp; /* remember location of argv for later */

       for (; --argc >= 0; sp += len, dp += len)
               if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 ||
                   (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0)
                       return error;

       if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0)
               return error;

       if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0)
               return error;

       arginfo->ps_envstr = cpp; /* remember location of envp for later */

       for (; --envc >= 0; sp += len, dp += len)
               if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 ||
                   (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0)
                       return error;

       if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0)
               return error;

       *stackp = (char *)cpp;
       return 0;
}

int
exec_linux_aout_makecmds(struct lwp *l, struct exec_package *epp)
{
       struct exec *linux_ep = epp->ep_hdr;
       int machtype, magic;
       int error = ENOEXEC;

       if (epp->ep_hdrvalid < sizeof(struct exec))
               return ENOEXEC;

       magic = LINUX_N_MAGIC(linux_ep);
       machtype = LINUX_N_MACHTYPE(linux_ep);

       if (machtype != LINUX_MID_MACHINE)
               return (ENOEXEC);

       switch (magic) {
       case QMAGIC:
               error = exec_linux_aout_prep_qmagic(l, epp);
               break;
       case ZMAGIC:
               error = exec_linux_aout_prep_zmagic(l, epp);
               break;
       case NMAGIC:
               error = exec_linux_aout_prep_nmagic(l, epp);
               break;
       case OMAGIC:
               error = exec_linux_aout_prep_omagic(l, epp);
               break;
       }
       return error;
}

/*
* Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
* is very likely not page aligned on most architectures, it is treated
* as an NMAGIC here. XXX
*/

static int
exec_linux_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
{
       struct exec *execp = epp->ep_hdr;

       epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
       epp->ep_tsize = execp->a_text;
       epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
       epp->ep_dsize = execp->a_data + execp->a_bss;
       epp->ep_entry = execp->a_entry;

       /* set up command for text segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
           epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
           VM_PROT_READ|VM_PROT_EXECUTE);

       /* set up command for data segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
           epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
           VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       /* set up command for bss segment */
       if (execp->a_bss)
               NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
                   epp->ep_daddr + execp->a_data, NULLVP, 0,
                   VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       return (*epp->ep_esch->es_setup_stack)(l, epp);
}

/*
* exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
* Not different from the normal stuff.
*/

static int
exec_linux_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
{
       struct exec *execp = epp->ep_hdr;
       long bsize, baddr;

       epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
       epp->ep_tsize = execp->a_text;
       epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
       epp->ep_dsize = execp->a_data + execp->a_bss;
       epp->ep_entry = execp->a_entry;

       /* set up command for text segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
           epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
           VM_PROT_READ|VM_PROT_EXECUTE);

       /* set up command for data segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
           epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
           VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       /* set up command for bss segment */
       baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
       bsize = epp->ep_daddr + epp->ep_dsize - baddr;
       if (bsize > 0)
               NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
                   NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       return (*epp->ep_esch->es_setup_stack)(l, epp);
}

/*
* exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
* Business as usual.
*/

static int
exec_linux_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
{
       struct exec *execp = epp->ep_hdr;
       long dsize, bsize, baddr;

       epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
       epp->ep_tsize = execp->a_text;
       epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
       epp->ep_dsize = execp->a_data + execp->a_bss;
       epp->ep_entry = execp->a_entry;

       /* set up command for text and data segments */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
           execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
           LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       /* set up command for bss segment */
       baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
       bsize = epp->ep_daddr + epp->ep_dsize - baddr;
       if (bsize > 0)
               NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
                   NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       /*
        * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
        * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
        * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
        * respectively to page boundaries.
        * Compensate `ep_dsize' for the amount of data covered by the last
        * text page.
        */
       dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
                                                       PAGE_SIZE);
       epp->ep_dsize = (dsize > 0) ? dsize : 0;
       return (*epp->ep_esch->es_setup_stack)(l, epp);
}

static int
exec_linux_aout_prep_qmagic(struct lwp *l, struct exec_package *epp)
{
       struct exec *execp = epp->ep_hdr;
       int error;

       epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
       epp->ep_tsize = execp->a_text;
       epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
       epp->ep_dsize = execp->a_data + execp->a_bss;
       epp->ep_entry = execp->a_entry;

       error = vn_marktext(epp->ep_vp);
       if (error)
               return (error);

       /* set up command for text segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
           epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
           VM_PROT_READ|VM_PROT_EXECUTE);

       /* set up command for data segment */
       NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
           epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
           VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       /* set up command for bss segment */
       if (execp->a_bss)
               NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
                   epp->ep_daddr + execp->a_data, NULLVP, 0,
                   VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);

       return (*epp->ep_esch->es_setup_stack)(l, epp);
}

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