FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_exec_aout.c

     /*      $NetBSD: linux_exec_aout.c,v 1.55 2003/08/08 18:57:06 christos 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the NetBSD
     *      Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * 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 1.55 2003/08/08 18:57:06 christos Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/namei.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/exec.h>
    #include <sys/exec_elf.h>
    
    #include <sys/mman.h>
    #include <sys/sa.h>
    #include <sys/syscallargs.h>
    
    #include <machine/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 __P((struct proc *, struct exec_package *,
        struct ps_strings *, char **, void *));
    
    static int exec_linux_aout_prep_zmagic __P((struct proc *,
        struct exec_package *));
    static int exec_linux_aout_prep_nmagic __P((struct proc *,
        struct exec_package *));
    static int exec_linux_aout_prep_omagic __P((struct proc *,
        struct exec_package *));
    static int exec_linux_aout_prep_qmagic __P((struct proc *,
        struct exec_package *));
    
    int
    linux_aout_copyargs(p, pack, arginfo, stackp, argp)
            struct proc *p;
            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(p, epp)
           struct proc *p;
           struct exec_package *epp;
   {
           struct exec *linux_ep = epp->ep_hdr;
           int machtype, magic;
           int error = 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(p, epp);
                   break;
           case ZMAGIC:
                   error = exec_linux_aout_prep_zmagic(p, epp);
                   break;
           case NMAGIC:
                   error = exec_linux_aout_prep_nmagic(p, epp);
                   break;
           case OMAGIC:
                   error = exec_linux_aout_prep_omagic(p, 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(p, epp)
           struct proc *p;
           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 */
           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)(p, epp);
   }
   
   /*
    * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
    * Not different from the normal stuff.
    */
   
   static int
   exec_linux_aout_prep_nmagic(p, epp)
           struct proc *p;
           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)(p, epp);
   }
   
   /*
    * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
    * Business as usual.
    */
   
   static int
   exec_linux_aout_prep_omagic(p, epp)
           struct proc *p;
           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)(p, epp);
   }
   
   static int
   exec_linux_aout_prep_qmagic(p, epp)
           struct proc *p;
           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 */
           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)(p, epp);
   }

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