sys/compat/linux/common/linux_exec_aout.c

   1 /*      $NetBSD: linux_exec_aout.c,v 1.65 2008/04/28 20:23:43 martin Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * based on exec_aout.c, sunos_exec.c and svr4_exec.c
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.65 2008/04/28 20:23:43 martin Exp $");
  38
  39 #ifdef _KERNEL_OPT
  40 #include "opt_execfmt.h"
  41 #endif
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/kernel.h>
  46 #include <sys/proc.h>
  47 #include <sys/malloc.h>
  48 #include <sys/namei.h>
  49 #include <sys/vnode.h>
  50 #include <sys/mount.h>
  51 #include <sys/exec.h>
  52
  53 #include <sys/mman.h>
  54 #include <sys/syscallargs.h>
  55
  56 #include <sys/cpu.h>
  57 #include <machine/reg.h>
  58
  59 #include <compat/linux/common/linux_types.h>
  60 #include <compat/linux/common/linux_signal.h>
  61 #include <compat/linux/common/linux_util.h>
  62 #include <compat/linux/common/linux_exec.h>
  63 #include <compat/linux/common/linux_machdep.h>
  64
  65 #include <compat/linux/linux_syscallargs.h>
  66 #include <compat/linux/linux_syscall.h>
  67
  68 int linux_aout_copyargs(struct lwp *, struct exec_package *,
  69     struct ps_strings *, char **, void *);
  70
  71 static int exec_linux_aout_prep_zmagic(struct lwp *,
  72     struct exec_package *);
  73 static int exec_linux_aout_prep_nmagic(struct lwp *,
  74     struct exec_package *);
  75 static int exec_linux_aout_prep_omagic(struct lwp *,
  76     struct exec_package *);
  77 static int exec_linux_aout_prep_qmagic(struct lwp *,
  78     struct exec_package *);
  79
  80 int
  81 linux_aout_copyargs(struct lwp *l, struct exec_package *pack,
  82     struct ps_strings *arginfo, char **stackp, void *argp)
  83 {
  84         char **cpp = (char **)*stackp;
  85         char **stk = (char **)*stackp;
  86         char *dp, *sp;
  87         size_t len;
  88         void *nullp = NULL;
  89         int argc = arginfo->ps_nargvstr;
  90         int envc = arginfo->ps_nenvstr;
  91         int error;
  92
  93         if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0)
  94                 return error;
  95
  96         /* leave room for envp and argv */
  97         cpp += 2;
  98         if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0)
  99                 return error;
 100
 101         dp = (char *) (cpp + argc + envc + 2);
 102         sp = argp;
 103
 104         /* XXX don't copy them out, remap them! */
 105         arginfo->ps_argvstr = cpp; /* remember location of argv for later */
 106
 107         for (; --argc >= 0; sp += len, dp += len)
 108                 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 ||
 109                     (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0)
 110                         return error;
 111
 112         if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0)
 113                 return error;
 114
 115         if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0)
 116                 return error;
 117
 118         arginfo->ps_envstr = cpp; /* remember location of envp for later */
 119
 120         for (; --envc >= 0; sp += len, dp += len)
 121                 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 ||
 122                     (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0)
 123                         return error;
 124
 125         if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0)
 126                 return error;
 127
 128         *stackp = (char *)cpp;
 129         return 0;
 130 }
 131
 132 int
 133 exec_linux_aout_makecmds(struct lwp *l, struct exec_package *epp)
 134 {
 135         struct exec *linux_ep = epp->ep_hdr;
 136         int machtype, magic;
 137         int error = ENOEXEC;
 138
 139         magic = LINUX_N_MAGIC(linux_ep);
 140         machtype = LINUX_N_MACHTYPE(linux_ep);
 141
 142
 143         if (machtype != LINUX_MID_MACHINE)
 144                 return (ENOEXEC);
 145
 146         switch (magic) {
 147         case QMAGIC:
 148                 error = exec_linux_aout_prep_qmagic(l, epp);
 149                 break;
 150         case ZMAGIC:
 151                 error = exec_linux_aout_prep_zmagic(l, epp);
 152                 break;
 153         case NMAGIC:
 154                 error = exec_linux_aout_prep_nmagic(l, epp);
 155                 break;
 156         case OMAGIC:
 157                 error = exec_linux_aout_prep_omagic(l, epp);
 158                 break;
 159         }
 160         return error;
 161 }
 162
 163 /*
 164  * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
 165  * is very likely not page aligned on most architectures, it is treated
 166  * as an NMAGIC here. XXX
 167  */
 168
 169 static int
 170 exec_linux_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
 171 {
 172         struct exec *execp = epp->ep_hdr;
 173
 174         epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
 175         epp->ep_tsize = execp->a_text;
 176         epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
 177         epp->ep_dsize = execp->a_data + execp->a_bss;
 178         epp->ep_entry = execp->a_entry;
 179
 180         /* set up command for text segment */
 181         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
 182             epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
 183             VM_PROT_READ|VM_PROT_EXECUTE);
 184
 185         /* set up command for data segment */
 186         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
 187             epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
 188             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 189
 190         /* set up command for bss segment */
 191         if (execp->a_bss)
 192                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
 193                     epp->ep_daddr + execp->a_data, NULLVP, 0,
 194                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 195
 196         return (*epp->ep_esch->es_setup_stack)(l, epp);
 197 }
 198
 199 /*
 200  * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
 201  * Not different from the normal stuff.
 202  */
 203
 204 static int
 205 exec_linux_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
 206 {
 207         struct exec *execp = epp->ep_hdr;
 208         long bsize, baddr;
 209
 210         epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
 211         epp->ep_tsize = execp->a_text;
 212         epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
 213         epp->ep_dsize = execp->a_data + execp->a_bss;
 214         epp->ep_entry = execp->a_entry;
 215
 216         /* set up command for text segment */
 217         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
 218             epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
 219             VM_PROT_READ|VM_PROT_EXECUTE);
 220
 221         /* set up command for data segment */
 222         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
 223             epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
 224             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 225
 226         /* set up command for bss segment */
 227         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 228         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 229         if (bsize > 0)
 230                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 231                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 232
 233         return (*epp->ep_esch->es_setup_stack)(l, epp);
 234 }
 235
 236 /*
 237  * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
 238  * Business as usual.
 239  */
 240
 241 static int
 242 exec_linux_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
 243 {
 244         struct exec *execp = epp->ep_hdr;
 245         long dsize, bsize, baddr;
 246
 247         epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
 248         epp->ep_tsize = execp->a_text;
 249         epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
 250         epp->ep_dsize = execp->a_data + execp->a_bss;
 251         epp->ep_entry = execp->a_entry;
 252
 253         /* set up command for text and data segments */
 254         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
 255             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
 256             LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 257
 258         /* set up command for bss segment */
 259         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 260         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 261         if (bsize > 0)
 262                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 263                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 264
 265         /*
 266          * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
 267          * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
 268          * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
 269          * respectively to page boundaries.
 270          * Compensate `ep_dsize' for the amount of data covered by the last
 271          * text page.
 272          */
 273         dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
 274                                                         PAGE_SIZE);
 275         epp->ep_dsize = (dsize > 0) ? dsize : 0;
 276         return (*epp->ep_esch->es_setup_stack)(l, epp);
 277 }
 278
 279 static int
 280 exec_linux_aout_prep_qmagic(struct lwp *l, struct exec_package *epp)
 281 {
 282         struct exec *execp = epp->ep_hdr;
 283         int error;
 284
 285         epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
 286         epp->ep_tsize = execp->a_text;
 287         epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
 288         epp->ep_dsize = execp->a_data + execp->a_bss;
 289         epp->ep_entry = execp->a_entry;
 290
 291         error = vn_marktext(epp->ep_vp);
 292         if (error)
 293                 return (error);
 294
 295         /* set up command for text segment */
 296         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
 297             epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
 298             VM_PROT_READ|VM_PROT_EXECUTE);
 299
 300         /* set up command for data segment */
 301         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
 302             epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
 303             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 304
 305         /* set up command for bss segment */
 306         if (execp->a_bss)
 307                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
 308                     epp->ep_daddr + execp->a_data, NULLVP, 0,
 309                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 310
 311         return (*epp->ep_esch->es_setup_stack)(l, epp);
 312 }