linux_exec_aout.c revision 1.39
1 /* $NetBSD: linux_exec_aout.c,v 1.39 2000/06/26 14:38:57 mrg 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 <vm/vm.h> 58 59 #include <machine/cpu.h> 60 #include <machine/reg.h> 61 62 #include <compat/linux/common/linux_types.h> 63 #include <compat/linux/common/linux_signal.h> 64 #include <compat/linux/common/linux_util.h> 65 #include <compat/linux/common/linux_exec.h> 66 #include <compat/linux/common/linux_machdep.h> 67 #include <compat/linux/common/linux_errno.h> 68 69 #include <compat/linux/linux_syscallargs.h> 70 #include <compat/linux/linux_syscall.h> 71 72 73 static void *linux_aout_copyargs __P((struct exec_package *, 74 struct ps_strings *, void *, void *)); 75 76 #define LINUX_AOUT_AUX_ARGSIZ 2 77 78 extern char linux_sigcode[], linux_esigcode[]; 79 extern struct sysent linux_sysent[]; 80 extern char *linux_syscallnames[]; 81 82 int exec_linux_aout_prep_zmagic __P((struct proc *, struct exec_package *)); 83 int exec_linux_aout_prep_nmagic __P((struct proc *, struct exec_package *)); 84 int exec_linux_aout_prep_omagic __P((struct proc *, struct exec_package *)); 85 int exec_linux_aout_prep_qmagic __P((struct proc *, struct exec_package *)); 86 87 struct emul emul_linux_aout = { 88 "linux", 89 native_to_linux_errno, 90 linux_sendsig, 91 LINUX_SYS_syscall, 92 LINUX_SYS_MAXSYSCALL, 93 linux_sysent, 94 linux_syscallnames, 95 LINUX_AOUT_AUX_ARGSIZ, 96 linux_aout_copyargs, 97 linux_setregs, 98 linux_sigcode, 99 linux_esigcode, 100 }; 101 102 static void * 103 linux_aout_copyargs(pack, arginfo, stack, argp) 104 struct exec_package *pack; 105 struct ps_strings *arginfo; 106 void *stack; 107 void *argp; 108 { 109 char **cpp = stack; 110 char **stk = stack; 111 char *dp, *sp; 112 size_t len; 113 void *nullp = NULL; 114 int argc = arginfo->ps_nargvstr; 115 int envc = arginfo->ps_nenvstr; 116 117 if (copyout(&argc, cpp++, sizeof(argc))) 118 return NULL; 119 120 /* leave room for envp and argv */ 121 cpp += 2; 122 if (copyout(&cpp, &stk[1], sizeof (cpp))) 123 return NULL; 124 125 dp = (char *) (cpp + argc + envc + 2); 126 sp = argp; 127 128 /* XXX don't copy them out, remap them! */ 129 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 130 131 for (; --argc >= 0; sp += len, dp += len) 132 if (copyout(&dp, cpp++, sizeof(dp)) || 133 copyoutstr(sp, dp, ARG_MAX, &len)) 134 return NULL; 135 136 if (copyout(&nullp, cpp++, sizeof(nullp))) 137 return NULL; 138 139 if (copyout(&cpp, &stk[2], sizeof (cpp))) 140 return NULL; 141 142 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 143 144 for (; --envc >= 0; sp += len, dp += len) 145 if (copyout(&dp, cpp++, sizeof(dp)) || 146 copyoutstr(sp, dp, ARG_MAX, &len)) 147 return NULL; 148 149 if (copyout(&nullp, cpp++, sizeof(nullp))) 150 return NULL; 151 152 return cpp; 153 } 154 155 int 156 exec_linux_aout_makecmds(p, epp) 157 struct proc *p; 158 struct exec_package *epp; 159 { 160 struct exec *linux_ep = epp->ep_hdr; 161 int machtype, magic; 162 int error = ENOEXEC; 163 164 magic = LINUX_N_MAGIC(linux_ep); 165 machtype = LINUX_N_MACHTYPE(linux_ep); 166 167 168 if (machtype != LINUX_MID_MACHINE) 169 return (ENOEXEC); 170 171 switch (magic) { 172 case QMAGIC: 173 error = exec_linux_aout_prep_qmagic(p, epp); 174 break; 175 case ZMAGIC: 176 error = exec_linux_aout_prep_zmagic(p, epp); 177 break; 178 case NMAGIC: 179 error = exec_linux_aout_prep_nmagic(p, epp); 180 break; 181 case OMAGIC: 182 error = exec_linux_aout_prep_omagic(p, epp); 183 break; 184 } 185 if (error == 0) 186 epp->ep_emul = &emul_linux_aout; 187 return error; 188 } 189 190 /* 191 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 192 * is very likely not page aligned on most architectures, it is treated 193 * as an NMAGIC here. XXX 194 */ 195 196 int 197 exec_linux_aout_prep_zmagic(p, epp) 198 struct proc *p; 199 struct exec_package *epp; 200 { 201 struct exec *execp = epp->ep_hdr; 202 203 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 204 epp->ep_tsize = execp->a_text; 205 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 206 epp->ep_dsize = execp->a_data + execp->a_bss; 207 epp->ep_entry = execp->a_entry; 208 209 /* set up command for text segment */ 210 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 211 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 212 VM_PROT_READ|VM_PROT_EXECUTE); 213 214 /* set up command for data segment */ 215 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 216 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 217 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 218 219 /* set up command for bss segment */ 220 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 221 epp->ep_daddr + execp->a_data, NULLVP, 0, 222 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 223 224 return exec_aout_setup_stack(p, epp); 225 } 226 227 /* 228 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 229 * Not different from the normal stuff. 230 */ 231 232 int 233 exec_linux_aout_prep_nmagic(p, epp) 234 struct proc *p; 235 struct exec_package *epp; 236 { 237 struct exec *execp = epp->ep_hdr; 238 long bsize, baddr; 239 240 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 241 epp->ep_tsize = execp->a_text; 242 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 243 epp->ep_dsize = execp->a_data + execp->a_bss; 244 epp->ep_entry = execp->a_entry; 245 246 /* set up command for text segment */ 247 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 248 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 249 VM_PROT_READ|VM_PROT_EXECUTE); 250 251 /* set up command for data segment */ 252 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 253 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 254 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 255 256 /* set up command for bss segment */ 257 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 258 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 259 if (bsize > 0) 260 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 261 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 262 263 return exec_aout_setup_stack(p, epp); 264 } 265 266 /* 267 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 268 * Business as usual. 269 */ 270 271 int 272 exec_linux_aout_prep_omagic(p, epp) 273 struct proc *p; 274 struct exec_package *epp; 275 { 276 struct exec *execp = epp->ep_hdr; 277 long dsize, bsize, baddr; 278 279 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 280 epp->ep_tsize = execp->a_text; 281 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 282 epp->ep_dsize = execp->a_data + execp->a_bss; 283 epp->ep_entry = execp->a_entry; 284 285 /* set up command for text and data segments */ 286 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 287 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 288 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 289 290 /* set up command for bss segment */ 291 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 292 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 293 if (bsize > 0) 294 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 295 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 296 297 /* 298 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 299 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 300 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 301 * respectively to page boundaries. 302 * Compensate `ep_dsize' for the amount of data covered by the last 303 * text page. 304 */ 305 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 306 epp->ep_dsize = (dsize > 0) ? dsize : 0; 307 return exec_aout_setup_stack(p, epp); 308 } 309 310 int 311 exec_linux_aout_prep_qmagic(p, epp) 312 struct proc *p; 313 struct exec_package *epp; 314 { 315 struct exec *execp = epp->ep_hdr; 316 317 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 318 epp->ep_tsize = execp->a_text; 319 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 320 epp->ep_dsize = execp->a_data + execp->a_bss; 321 epp->ep_entry = execp->a_entry; 322 323 /* 324 * check if vnode is in open for writing, because we want to 325 * demand-page out of it. if it is, don't do it, for various 326 * reasons 327 */ 328 if ((execp->a_text != 0 || execp->a_data != 0) && 329 epp->ep_vp->v_writecount != 0) { 330 #ifdef DIAGNOSTIC 331 if (epp->ep_vp->v_flag & VTEXT) 332 panic("exec: a VTEXT vnode has writecount != 0\n"); 333 #endif 334 return ETXTBSY; 335 } 336 vn_marktext(epp->ep_vp); 337 338 /* set up command for text segment */ 339 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 340 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 341 VM_PROT_READ|VM_PROT_EXECUTE); 342 343 /* set up command for data segment */ 344 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 345 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 346 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 347 348 /* set up command for bss segment */ 349 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 350 epp->ep_daddr + execp->a_data, NULLVP, 0, 351 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 352 353 return exec_aout_setup_stack(p, epp); 354 } 355 356 /* 357 * The Linux system call to load shared libraries, a.out version. The 358 * a.out shared libs are just files that are mapped onto a fixed 359 * address in the process' address space. The address is given in 360 * a_entry. Read in the header, set up some VM commands and run them. 361 * 362 * Yes, both text and data are mapped at once, so we're left with 363 * writeable text for the shared libs. The Linux crt0 seemed to break 364 * sometimes when data was mapped seperately. It munmapped a uselib() 365 * of ld.so by hand, which failed with shared text and data for ld.so 366 * Yuck. 367 * 368 * Because of the problem with ZMAGIC executables (text starts 369 * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC 370 * shared libs are not handled very efficiently :-( 371 */ 372 373 int 374 linux_sys_uselib(p, v, retval) 375 struct proc *p; 376 void *v; 377 register_t *retval; 378 { 379 struct linux_sys_uselib_args /* { 380 syscallarg(const char *) path; 381 } */ *uap = v; 382 caddr_t sg; 383 long bsize, dsize, tsize, taddr, baddr, daddr; 384 struct nameidata ni; 385 struct vnode *vp; 386 struct exec hdr; 387 struct exec_vmcmd_set vcset; 388 int i, magic, error; 389 size_t rem; 390 391 sg = stackgap_init(p->p_emul); 392 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 393 394 NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 395 396 if ((error = namei(&ni))) 397 return error; 398 399 vp = ni.ni_vp; 400 401 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE, 402 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, 403 &rem, p))) { 404 vrele(vp); 405 return error; 406 } 407 408 if (rem != 0) { 409 vrele(vp); 410 return ENOEXEC; 411 } 412 413 if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE) 414 return ENOEXEC; 415 416 magic = LINUX_N_MAGIC(&hdr); 417 taddr = hdr.a_entry & (~(NBPG - 1)); 418 tsize = hdr.a_text; 419 daddr = taddr + tsize; 420 dsize = hdr.a_data + hdr.a_bss; 421 422 if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) { 423 vrele(vp); 424 return ETXTBSY; 425 } 426 vn_marktext(vp); 427 428 vcset.evs_cnt = 0; 429 vcset.evs_used = 0; 430 431 NEW_VMCMD(&vcset, 432 magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn, 433 hdr.a_text + hdr.a_data, taddr, 434 vp, LINUX_N_TXTOFF(hdr, magic), 435 VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE); 436 437 baddr = roundup(daddr + hdr.a_data, NBPG); 438 bsize = daddr + dsize - baddr; 439 if (bsize > 0) { 440 NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr, 441 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 442 } 443 444 for (i = 0; i < vcset.evs_used && !error; i++) { 445 struct exec_vmcmd *vcp; 446 447 vcp = &vcset.evs_cmds[i]; 448 error = (*vcp->ev_proc)(p, vcp); 449 } 450 451 kill_vmcmds(&vcset); 452 453 vrele(vp); 454 455 return error; 456 } 457
Indexes created Wed Sep 24 22:09:59 GMT 2025