linux_exec_aout.c revision 1.44.2.2
1 /* $NetBSD: linux_exec_aout.c,v 1.44.2.2 2001/11/14 19:13:09 nathanw 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * based on exec_aout.c, sunos_exec.c and svr4_exec.c 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.44.2.2 2001/11/14 19:13:09 nathanw Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/malloc.h> 51 #include <sys/namei.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/exec.h> 55 #include <sys/exec_elf.h> 56 57 #include <sys/mman.h> 58 #include <sys/syscallargs.h> 59 60 #include <machine/cpu.h> 61 #include <machine/reg.h> 62 63 #include <compat/linux/common/linux_types.h> 64 #include <compat/linux/common/linux_signal.h> 65 #include <compat/linux/common/linux_util.h> 66 #include <compat/linux/common/linux_exec.h> 67 #include <compat/linux/common/linux_machdep.h> 68 69 #include <compat/linux/linux_syscallargs.h> 70 #include <compat/linux/linux_syscall.h> 71 72 int linux_aout_copyargs __P((struct exec_package *, struct ps_strings *, 73 char **, void *)); 74 75 static int exec_linux_aout_prep_zmagic __P((struct proc *, 76 struct exec_package *)); 77 static int exec_linux_aout_prep_nmagic __P((struct proc *, 78 struct exec_package *)); 79 static int exec_linux_aout_prep_omagic __P((struct proc *, 80 struct exec_package *)); 81 static int exec_linux_aout_prep_qmagic __P((struct proc *, 82 struct exec_package *)); 83 84 int 85 linux_aout_copyargs(pack, arginfo, stackp, argp) 86 struct exec_package *pack; 87 struct ps_strings *arginfo; 88 char **stackp; 89 void *argp; 90 { 91 char **cpp = (char **)*stackp; 92 char **stk = (char **)*stackp; 93 char *dp, *sp; 94 size_t len; 95 void *nullp = NULL; 96 int argc = arginfo->ps_nargvstr; 97 int envc = arginfo->ps_nenvstr; 98 int error; 99 100 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 101 return error; 102 103 /* leave room for envp and argv */ 104 cpp += 2; 105 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 106 return error; 107 108 dp = (char *) (cpp + argc + envc + 2); 109 sp = argp; 110 111 /* XXX don't copy them out, remap them! */ 112 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 113 114 for (; --argc >= 0; sp += len, dp += len) 115 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 116 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 117 return error; 118 119 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 120 return error; 121 122 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 123 return error; 124 125 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 126 127 for (; --envc >= 0; sp += len, dp += len) 128 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 129 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 130 return error; 131 132 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 133 return error; 134 135 *stackp = (char *)cpp; 136 return 0; 137 } 138 139 int 140 exec_linux_aout_makecmds(p, epp) 141 struct proc *p; 142 struct exec_package *epp; 143 { 144 struct exec *linux_ep = epp->ep_hdr; 145 int machtype, magic; 146 int error = ENOEXEC; 147 148 magic = LINUX_N_MAGIC(linux_ep); 149 machtype = LINUX_N_MACHTYPE(linux_ep); 150 151 152 if (machtype != LINUX_MID_MACHINE) 153 return (ENOEXEC); 154 155 switch (magic) { 156 case QMAGIC: 157 error = exec_linux_aout_prep_qmagic(p, epp); 158 break; 159 case ZMAGIC: 160 error = exec_linux_aout_prep_zmagic(p, epp); 161 break; 162 case NMAGIC: 163 error = exec_linux_aout_prep_nmagic(p, epp); 164 break; 165 case OMAGIC: 166 error = exec_linux_aout_prep_omagic(p, epp); 167 break; 168 } 169 return error; 170 } 171 172 /* 173 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 174 * is very likely not page aligned on most architectures, it is treated 175 * as an NMAGIC here. XXX 176 */ 177 178 static int 179 exec_linux_aout_prep_zmagic(p, epp) 180 struct proc *p; 181 struct exec_package *epp; 182 { 183 struct exec *execp = epp->ep_hdr; 184 185 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 186 epp->ep_tsize = execp->a_text; 187 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 188 epp->ep_dsize = execp->a_data + execp->a_bss; 189 epp->ep_entry = execp->a_entry; 190 191 /* set up command for text segment */ 192 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 193 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 194 VM_PROT_READ|VM_PROT_EXECUTE); 195 196 /* set up command for data segment */ 197 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 198 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 199 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 200 201 /* set up command for bss segment */ 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 203 epp->ep_daddr + execp->a_data, NULLVP, 0, 204 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 205 206 return exec_aout_setup_stack(p, epp); 207 } 208 209 /* 210 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 211 * Not different from the normal stuff. 212 */ 213 214 static int 215 exec_linux_aout_prep_nmagic(p, epp) 216 struct proc *p; 217 struct exec_package *epp; 218 { 219 struct exec *execp = epp->ep_hdr; 220 long bsize, baddr; 221 222 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 223 epp->ep_tsize = execp->a_text; 224 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 225 epp->ep_dsize = execp->a_data + execp->a_bss; 226 epp->ep_entry = execp->a_entry; 227 228 /* set up command for text segment */ 229 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 230 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 231 VM_PROT_READ|VM_PROT_EXECUTE); 232 233 /* set up command for data segment */ 234 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 235 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 236 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 237 238 /* set up command for bss segment */ 239 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 240 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 241 if (bsize > 0) 242 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 243 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 244 245 return exec_aout_setup_stack(p, epp); 246 } 247 248 /* 249 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 250 * Business as usual. 251 */ 252 253 static int 254 exec_linux_aout_prep_omagic(p, epp) 255 struct proc *p; 256 struct exec_package *epp; 257 { 258 struct exec *execp = epp->ep_hdr; 259 long dsize, bsize, baddr; 260 261 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 262 epp->ep_tsize = execp->a_text; 263 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 264 epp->ep_dsize = execp->a_data + execp->a_bss; 265 epp->ep_entry = execp->a_entry; 266 267 /* set up command for text and data segments */ 268 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 269 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 270 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 271 272 /* set up command for bss segment */ 273 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 274 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 275 if (bsize > 0) 276 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 277 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 278 279 /* 280 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 281 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 282 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 283 * respectively to page boundaries. 284 * Compensate `ep_dsize' for the amount of data covered by the last 285 * text page. 286 */ 287 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 288 epp->ep_dsize = (dsize > 0) ? dsize : 0; 289 return exec_aout_setup_stack(p, epp); 290 } 291 292 static int 293 exec_linux_aout_prep_qmagic(p, epp) 294 struct proc *p; 295 struct exec_package *epp; 296 { 297 struct exec *execp = epp->ep_hdr; 298 299 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 300 epp->ep_tsize = execp->a_text; 301 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 302 epp->ep_dsize = execp->a_data + execp->a_bss; 303 epp->ep_entry = execp->a_entry; 304 305 /* 306 * check if vnode is in open for writing, because we want to 307 * demand-page out of it. if it is, don't do it, for various 308 * reasons 309 */ 310 if ((execp->a_text != 0 || execp->a_data != 0) && 311 epp->ep_vp->v_writecount != 0) { 312 #ifdef DIAGNOSTIC 313 if (epp->ep_vp->v_flag & VTEXT) 314 panic("exec: a VTEXT vnode has writecount != 0\n"); 315 #endif 316 return ETXTBSY; 317 } 318 epp->ep_vp->v_flag |= VTEXT; 319 320 /* set up command for text segment */ 321 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 322 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 323 VM_PROT_READ|VM_PROT_EXECUTE); 324 325 /* set up command for data segment */ 326 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 327 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 328 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 329 330 /* set up command for bss segment */ 331 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 332 epp->ep_daddr + execp->a_data, NULLVP, 0, 333 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 334 335 return exec_aout_setup_stack(p, epp); 336 } 337
Indexes created Tue Sep 23 20:09:58 GMT 2025