sys/compat/netbsd32/netbsd32_exec_aout.c

   1 /*      $NetBSD: netbsd32_exec_aout.c,v 1.23 2007/12/08 18:36:18 dsl Exp $      */
   2 /*      from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
   3
   4 /*
   5  * Copyright (c) 1998, 2001 Matthew R. Green.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * Copyright (c) 1993, 1994 Christopher G. Demetriou
  31  * All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by Christopher G. Demetriou.
  44  * 4. The name of the author may not be used to endorse or promote products
  45  *    derived from this software without specific prior written permission
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  48  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  49  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  50  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  51  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  52  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  53  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  54  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  55  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  56  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  57  */
  58
  59 #include <sys/cdefs.h>
  60 __KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_aout.c,v 1.23 2007/12/08 18:36:18 dsl Exp $");
  61
  62 #include <sys/param.h>
  63 #include <sys/systm.h>
  64 #include <sys/proc.h>
  65 #include <sys/malloc.h>
  66 #include <sys/vnode.h>
  67 #include <sys/exec.h>
  68 #include <sys/exec_aout.h>
  69 #include <sys/resourcevar.h>
  70 #include <sys/signal.h>
  71 #include <sys/signalvar.h>
  72
  73 #include <compat/netbsd32/netbsd32.h>
  74 #ifndef EXEC_AOUT
  75 #define EXEC_AOUT
  76 #endif
  77 #include <compat/netbsd32/netbsd32_exec.h>
  78
  79 #include <machine/frame.h>
  80 #include <machine/netbsd32_machdep.h>
  81
  82 int netbsd32_copyinargs(struct exec_package *, struct ps_strings *,
  83                              void *, size_t, const void *, const void *);
  84
  85 /*
  86  * exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format
  87  * executable.
  88  *
  89  * Given a lwp pointer and an exec package pointer, see if the referent
  90  * of the epp is in netbsd32 a.out format.  Check 'standard' magic
  91  * numbers for this architecture.
  92  *
  93  * This function, in the former case, or the hook, in the latter, is
  94  * responsible for creating a set of vmcmds which can be used to build
  95  * the process's vm space and inserting them into the exec package.
  96  */
  97
  98 int
  99 exec_netbsd32_makecmds(struct lwp *l, struct exec_package *epp)
 100 {
 101         netbsd32_u_long midmag, magic;
 102         u_short mid;
 103         int error;
 104         struct netbsd32_exec *execp = epp->ep_hdr;
 105
 106         if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec))
 107                 return ENOEXEC;
 108
 109         midmag = (netbsd32_u_long)ntohl(execp->a_midmag);
 110         mid = (midmag >> 16) & 0x3ff;
 111         magic = midmag & 0xffff;
 112
 113         midmag = mid << 16 | magic;
 114
 115         /* this is already needed by setup_stack() */
 116         epp->ep_flags |= EXEC_32;
 117
 118         switch (midmag) {
 119         case (NETBSD32_MID_MACHINE << 16) | ZMAGIC:
 120                 error = netbsd32_exec_aout_prep_zmagic(l, epp);
 121                 break;
 122         case (NETBSD32_MID_MACHINE << 16) | NMAGIC:
 123                 error = netbsd32_exec_aout_prep_nmagic(l, epp);
 124                 break;
 125         case (NETBSD32_MID_MACHINE << 16) | OMAGIC:
 126                 error = netbsd32_exec_aout_prep_omagic(l, epp);
 127                 break;
 128         default:
 129                 /* Invalid magic */
 130                 error = ENOEXEC;
 131                 break;
 132         }
 133
 134         if (error) {
 135                 kill_vmcmds(&epp->ep_vmcmds);
 136                 epp->ep_flags &= ~EXEC_32;
 137         }
 138         return error;
 139 }
 140
 141 /*
 142  * netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's
 143  * exec package
 144  *
 145  * First, set of the various offsets/lengths in the exec package.
 146  *
 147  * Then, mark the text image busy (so it can be demand paged) or error
 148  * out if this is not possible.  Finally, set up vmcmds for the
 149  * text, data, bss, and stack segments.
 150  */
 151
 152 int
 153 netbsd32_exec_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
 154 {
 155         struct netbsd32_exec *execp = epp->ep_hdr;
 156         int error;
 157
 158         epp->ep_taddr = AOUT_LDPGSZ;
 159         epp->ep_tsize = execp->a_text;
 160         epp->ep_daddr = epp->ep_taddr + execp->a_text;
 161         epp->ep_dsize = execp->a_data + execp->a_bss;
 162         epp->ep_entry = execp->a_entry;
 163         epp->ep_vm_minaddr = VM_MIN_ADDRESS;
 164         epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
 165
 166         error = vn_marktext(epp->ep_vp);
 167         if (error)
 168                 return (error);
 169
 170         /* set up command for text segment */
 171         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
 172             epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
 173
 174         /* set up command for data segment */
 175         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
 176             epp->ep_daddr, epp->ep_vp, execp->a_text,
 177             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 178
 179         /* set up command for bss segment */
 180         if (execp->a_bss > 0)
 181                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
 182                     epp->ep_daddr + execp->a_data, NULLVP, 0,
 183                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 184
 185         return (*epp->ep_esch->es_setup_stack)(l, epp);
 186 }
 187
 188 /*
 189  * netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's
 190  * exec package
 191  */
 192
 193 int
 194 netbsd32_exec_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
 195 {
 196         struct netbsd32_exec *execp = epp->ep_hdr;
 197         long bsize, baddr;
 198
 199         epp->ep_taddr = AOUT_LDPGSZ;
 200         epp->ep_tsize = execp->a_text;
 201         epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
 202         epp->ep_dsize = execp->a_data + execp->a_bss;
 203         epp->ep_entry = execp->a_entry;
 204         epp->ep_vm_minaddr = VM_MIN_ADDRESS;
 205         epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
 206
 207         /* set up command for text segment */
 208         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
 209             epp->ep_taddr, epp->ep_vp, sizeof(struct netbsd32_exec),
 210             VM_PROT_READ|VM_PROT_EXECUTE);
 211
 212         /* set up command for data segment */
 213         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
 214             epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct netbsd32_exec),
 215             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 216
 217         /* set up command for bss segment */
 218         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 219         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 220         if (bsize > 0)
 221                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 222                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 223
 224         return (*epp->ep_esch->es_setup_stack)(l, epp);
 225 }
 226
 227 /*
 228  * netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's
 229  * exec package
 230  */
 231
 232 int
 233 netbsd32_exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
 234 {
 235         struct netbsd32_exec *execp = epp->ep_hdr;
 236         long dsize, bsize, baddr;
 237
 238         epp->ep_taddr = AOUT_LDPGSZ;
 239         epp->ep_tsize = execp->a_text;
 240         epp->ep_daddr = epp->ep_taddr + execp->a_text;
 241         epp->ep_dsize = execp->a_data + execp->a_bss;
 242         epp->ep_entry = execp->a_entry;
 243         epp->ep_vm_minaddr = VM_MIN_ADDRESS;
 244         epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
 245
 246         /* set up command for text and data segments */
 247         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
 248             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
 249             sizeof(struct netbsd32_exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 250
 251         /* set up command for bss segment */
 252         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 253         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 254         if (bsize > 0)
 255                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 256                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 257
 258         /*
 259          * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
 260          * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
 261          * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
 262          * respectively to page boundaries.
 263          * Compensate `ep_dsize' for the amount of data covered by the last
 264          * text page.
 265          */
 266         dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
 267                                                         PAGE_SIZE);
 268         epp->ep_dsize = (dsize > 0) ? dsize : 0;
 269         return (*epp->ep_esch->es_setup_stack)(l, epp);
 270 }