linux_exec_aout.c revision 1.46
1 /* $NetBSD: linux_exec_aout.c,v 1.46 2001/10/30 15:32:02 thorpej 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/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 #include <sys/exec_elf.h> 53 54 #include <sys/mman.h> 55 #include <sys/syscallargs.h> 56 57 #include <machine/cpu.h> 58 #include <machine/reg.h> 59 60 #include <compat/linux/common/linux_types.h> 61 #include <compat/linux/common/linux_signal.h> 62 #include <compat/linux/common/linux_util.h> 63 #include <compat/linux/common/linux_exec.h> 64 #include <compat/linux/common/linux_machdep.h> 65 66 #include <compat/linux/linux_syscallargs.h> 67 #include <compat/linux/linux_syscall.h> 68 69 int linux_aout_copyargs __P((struct exec_package *, struct ps_strings *, 70 char **, void *)); 71 72 static int exec_linux_aout_prep_zmagic __P((struct proc *, 73 struct exec_package *)); 74 static int exec_linux_aout_prep_nmagic __P((struct proc *, 75 struct exec_package *)); 76 static int exec_linux_aout_prep_omagic __P((struct proc *, 77 struct exec_package *)); 78 static int exec_linux_aout_prep_qmagic __P((struct proc *, 79 struct exec_package *)); 80 81 int 82 linux_aout_copyargs(pack, arginfo, stackp, argp) 83 struct exec_package *pack; 84 struct ps_strings *arginfo; 85 char **stackp; 86 void *argp; 87 { 88 char **cpp = (char **)*stackp; 89 char **stk = (char **)*stackp; 90 char *dp, *sp; 91 size_t len; 92 void *nullp = NULL; 93 int argc = arginfo->ps_nargvstr; 94 int envc = arginfo->ps_nenvstr; 95 int error; 96 97 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 98 return error; 99 100 /* leave room for envp and argv */ 101 cpp += 2; 102 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 103 return error; 104 105 dp = (char *) (cpp + argc + envc + 2); 106 sp = argp; 107 108 /* XXX don't copy them out, remap them! */ 109 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 110 111 for (; --argc >= 0; sp += len, dp += len) 112 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 113 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 114 return error; 115 116 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 117 return error; 118 119 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 120 return error; 121 122 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 123 124 for (; --envc >= 0; sp += len, dp += len) 125 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 126 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 127 return error; 128 129 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 130 return error; 131 132 *stackp = (char *)cpp; 133 return 0; 134 } 135 136 int 137 exec_linux_aout_makecmds(p, epp) 138 struct proc *p; 139 struct exec_package *epp; 140 { 141 struct exec *linux_ep = epp->ep_hdr; 142 int machtype, magic; 143 int error = ENOEXEC; 144 145 magic = LINUX_N_MAGIC(linux_ep); 146 machtype = LINUX_N_MACHTYPE(linux_ep); 147 148 149 if (machtype != LINUX_MID_MACHINE) 150 return (ENOEXEC); 151 152 switch (magic) { 153 case QMAGIC: 154 error = exec_linux_aout_prep_qmagic(p, epp); 155 break; 156 case ZMAGIC: 157 error = exec_linux_aout_prep_zmagic(p, epp); 158 break; 159 case NMAGIC: 160 error = exec_linux_aout_prep_nmagic(p, epp); 161 break; 162 case OMAGIC: 163 error = exec_linux_aout_prep_omagic(p, epp); 164 break; 165 } 166 return error; 167 } 168 169 /* 170 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 171 * is very likely not page aligned on most architectures, it is treated 172 * as an NMAGIC here. XXX 173 */ 174 175 static int 176 exec_linux_aout_prep_zmagic(p, epp) 177 struct proc *p; 178 struct exec_package *epp; 179 { 180 struct exec *execp = epp->ep_hdr; 181 182 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 183 epp->ep_tsize = execp->a_text; 184 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 185 epp->ep_dsize = execp->a_data + execp->a_bss; 186 epp->ep_entry = execp->a_entry; 187 188 /* set up command for text segment */ 189 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 190 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 191 VM_PROT_READ|VM_PROT_EXECUTE); 192 193 /* set up command for data segment */ 194 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 195 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 196 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 197 198 /* set up command for bss segment */ 199 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 200 epp->ep_daddr + execp->a_data, NULLVP, 0, 201 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 202 203 return exec_aout_setup_stack(p, epp); 204 } 205 206 /* 207 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 208 * Not different from the normal stuff. 209 */ 210 211 static int 212 exec_linux_aout_prep_nmagic(p, epp) 213 struct proc *p; 214 struct exec_package *epp; 215 { 216 struct exec *execp = epp->ep_hdr; 217 long bsize, baddr; 218 219 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 220 epp->ep_tsize = execp->a_text; 221 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 222 epp->ep_dsize = execp->a_data + execp->a_bss; 223 epp->ep_entry = execp->a_entry; 224 225 /* set up command for text segment */ 226 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 227 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 228 VM_PROT_READ|VM_PROT_EXECUTE); 229 230 /* set up command for data segment */ 231 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 232 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 233 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 234 235 /* set up command for bss segment */ 236 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 237 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 238 if (bsize > 0) 239 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 240 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 241 242 return exec_aout_setup_stack(p, epp); 243 } 244 245 /* 246 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 247 * Business as usual. 248 */ 249 250 static int 251 exec_linux_aout_prep_omagic(p, epp) 252 struct proc *p; 253 struct exec_package *epp; 254 { 255 struct exec *execp = epp->ep_hdr; 256 long dsize, bsize, baddr; 257 258 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 259 epp->ep_tsize = execp->a_text; 260 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 261 epp->ep_dsize = execp->a_data + execp->a_bss; 262 epp->ep_entry = execp->a_entry; 263 264 /* set up command for text and data segments */ 265 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 266 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 267 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 268 269 /* set up command for bss segment */ 270 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 271 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 272 if (bsize > 0) 273 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 274 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 275 276 /* 277 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 278 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 279 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 280 * respectively to page boundaries. 281 * Compensate `ep_dsize' for the amount of data covered by the last 282 * text page. 283 */ 284 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 285 epp->ep_dsize = (dsize > 0) ? dsize : 0; 286 return exec_aout_setup_stack(p, epp); 287 } 288 289 static int 290 exec_linux_aout_prep_qmagic(p, epp) 291 struct proc *p; 292 struct exec_package *epp; 293 { 294 struct exec *execp = epp->ep_hdr; 295 296 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 297 epp->ep_tsize = execp->a_text; 298 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 299 epp->ep_dsize = execp->a_data + execp->a_bss; 300 epp->ep_entry = execp->a_entry; 301 302 /* 303 * check if vnode is in open for writing, because we want to 304 * demand-page out of it. if it is, don't do it, for various 305 * reasons 306 */ 307 if ((execp->a_text != 0 || execp->a_data != 0) && 308 epp->ep_vp->v_writecount != 0) { 309 #ifdef DIAGNOSTIC 310 if (epp->ep_vp->v_flag & VTEXT) 311 panic("exec: a VTEXT vnode has writecount != 0\n"); 312 #endif 313 return ETXTBSY; 314 } 315 epp->ep_vp->v_flag |= VTEXT; 316 317 /* set up command for text segment */ 318 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 319 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 320 VM_PROT_READ|VM_PROT_EXECUTE); 321 322 /* set up command for data segment */ 323 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 324 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 325 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 326 327 /* set up command for bss segment */ 328 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 329 epp->ep_daddr + execp->a_data, NULLVP, 0, 330 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 331 332 return exec_aout_setup_stack(p, epp); 333 } 334
Indexes created Tue Sep 23 14:10:03 GMT 2025