The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/compat/sunos/sunos_exec_aout.c

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    1 /*      $NetBSD: sunos_exec_aout.c,v 1.17 2007/12/08 18:36:23 dsl Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1993 Theo de Raadt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __KERNEL_RCSID(0, "$NetBSD: sunos_exec_aout.c,v 1.17 2007/12/08 18:36:23 dsl Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/filedesc.h>
   36 #include <sys/kernel.h>
   37 #include <sys/proc.h>
   38 #include <sys/mount.h>
   39 #include <sys/malloc.h>
   40 #include <sys/namei.h>
   41 #include <sys/signalvar.h>
   42 #include <sys/vnode.h>
   43 #include <sys/file.h>
   44 #include <sys/exec.h>
   45 #include <sys/resourcevar.h>
   46 #include <sys/wait.h>
   47 
   48 #include <sys/mman.h>
   49 
   50 #include <sys/cpu.h>
   51 #include <machine/reg.h>
   52 
   53 #include <compat/sunos/sunos.h>
   54 #include <compat/sunos/sunos_exec.h>
   55 #include <compat/sunos/sunos_syscall.h>
   56 
   57 #ifdef __sparc__
   58 #define sunos_exec_aout_prep_zmagic exec_aout_prep_zmagic
   59 #define sunos_exec_aout_prep_nmagic exec_aout_prep_nmagic
   60 #define sunos_exec_aout_prep_omagic exec_aout_prep_omagic
   61 #endif
   62 
   63 int sunos_exec_aout_prep_zmagic(struct lwp *, struct exec_package *);
   64 int sunos_exec_aout_prep_nmagic(struct lwp *, struct exec_package *);
   65 int sunos_exec_aout_prep_omagic(struct lwp *, struct exec_package *);
   66 
   67 int
   68 exec_sunos_aout_makecmds(struct lwp *l, struct exec_package *epp)
   69 {
   70         struct sunos_exec *sunmag = epp->ep_hdr;
   71         int error = ENOEXEC;
   72 
   73         if (!SUNOS_M_NATIVE(sunmag->a_machtype))
   74                 return (ENOEXEC);
   75 
   76         switch (sunmag->a_magic) {
   77         case ZMAGIC:
   78                 error = sunos_exec_aout_prep_zmagic(l, epp);
   79                 break;
   80         case NMAGIC:
   81                 error = sunos_exec_aout_prep_nmagic(l, epp);
   82                 break;
   83         case OMAGIC:
   84                 error = sunos_exec_aout_prep_omagic(l, epp);
   85                 break;
   86         }
   87         return error;
   88 }
   89 
   90 /*
   91  * the code below is only needed for sun2/sun3 emulation.
   92  */
   93 #ifndef __sparc__
   94 
   95 /* suns keep data seg aligned to SEGSIZ because of sun custom mmu */
   96 #define SEGSIZ          0x20000
   97 #define SUNOS_N_TXTADDR(x,m)    0x2000
   98 #define SUNOS_N_DATADDR(x,m)    (((m)==OMAGIC) ? \
   99         (SUNOS_N_TXTADDR(x,m) + (x).a_text) : \
  100         (SEGSIZ + ((SUNOS_N_TXTADDR(x,m) + (x).a_text - 1) & ~(SEGSIZ-1))))
  101 #define SUNOS_N_BSSADDR(x,m)    (SUNOS_N_DATADDR(x,m)+(x).a_data)
  102 
  103 #define SUNOS_N_TXTOFF(x,m)     ((m)==ZMAGIC ? 0 : sizeof (struct exec))
  104 #define SUNOS_N_DATOFF(x,m)     (SUNOS_N_TXTOFF(x,m) + (x).a_text)
  105 
  106 /*
  107  * sunos_exec_aout_prep_zmagic(): Prepare a SunOS ZMAGIC binary's exec package
  108  *
  109  * First, set of the various offsets/lengths in the exec package.
  110  *
  111  * Then, mark the text image busy (so it can be demand paged) or error
  112  * out if this is not possible.  Finally, set up vmcmds for the
  113  * text, data, bss, and stack segments.
  114  */
  115 int
  116 sunos_exec_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
  117 {
  118         struct exec *execp = epp->ep_hdr;
  119         int error;
  120 
  121         epp->ep_taddr = SUNOS_N_TXTADDR(*execp, ZMAGIC);
  122         epp->ep_tsize = execp->a_text;
  123         epp->ep_daddr = SUNOS_N_DATADDR(*execp, ZMAGIC);
  124         epp->ep_dsize = execp->a_data + execp->a_bss;
  125         epp->ep_entry = execp->a_entry;
  126 
  127         error = vn_marktext(epp->ep_vp);
  128         if (error)
  129                 return (error);
  130 
  131         /* set up command for text segment */
  132         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
  133             epp->ep_taddr, epp->ep_vp, SUNOS_N_TXTOFF(*execp, ZMAGIC),
  134             VM_PROT_READ|VM_PROT_EXECUTE);
  135 
  136         /* set up command for data segment */
  137         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
  138             epp->ep_daddr, epp->ep_vp, SUNOS_N_DATOFF(*execp, ZMAGIC),
  139             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  140 
  141         /* set up command for bss segment */
  142         if (execp->a_bss)
  143                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
  144                     epp->ep_daddr + execp->a_data, NULLVP, 0,
  145                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  146 
  147         return (*epp->ep_esch->es_setup_stack)(l, epp);
  148 }
  149 
  150 /*
  151  * sunos_exec_aout_prep_nmagic(): Prepare a SunOS NMAGIC binary's exec package
  152  */
  153 int
  154 sunos_exec_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
  155 {
  156         struct exec *execp = epp->ep_hdr;
  157         long bsize, baddr;
  158 
  159         epp->ep_taddr = SUNOS_N_TXTADDR(*execp, NMAGIC);
  160         epp->ep_tsize = execp->a_text;
  161         epp->ep_daddr = SUNOS_N_DATADDR(*execp, NMAGIC);
  162         epp->ep_dsize = execp->a_data + execp->a_bss;
  163         epp->ep_entry = execp->a_entry;
  164 
  165         /* set up command for text segment */
  166         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
  167             epp->ep_taddr, epp->ep_vp, SUNOS_N_TXTOFF(*execp, NMAGIC),
  168             VM_PROT_READ|VM_PROT_EXECUTE);
  169 
  170         /* set up command for data segment */
  171         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
  172             epp->ep_daddr, epp->ep_vp, SUNOS_N_DATOFF(*execp, NMAGIC),
  173             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  174 
  175         /* set up command for bss segment */
  176         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
  177         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  178         if (bsize > 0)
  179                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  180                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  181 
  182         return (*epp->ep_esch->es_setup_stack)(l, epp);
  183 }
  184 
  185 /*
  186  * sunos_exec_aout_prep_omagic(): Prepare a SunOS OMAGIC binary's exec package
  187  */
  188 int
  189 sunos_exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
  190 {
  191         struct exec *execp = epp->ep_hdr;
  192         long bsize, baddr;
  193 
  194         epp->ep_taddr = SUNOS_N_TXTADDR(*execp, OMAGIC);
  195         epp->ep_tsize = execp->a_text;
  196         epp->ep_daddr = SUNOS_N_DATADDR(*execp, OMAGIC);
  197         epp->ep_dsize = execp->a_data + execp->a_bss;
  198         epp->ep_entry = execp->a_entry;
  199 
  200         /* set up command for text and data segments */
  201         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
  202             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
  203             SUNOS_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  204 
  205         /* set up command for bss segment */
  206         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
  207         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  208         if (bsize > 0)
  209                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  210                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  211 
  212         return (*epp->ep_esch->es_setup_stack)(l, epp);
  213 }
  214 #endif /* !sparc */

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