linux_exec_aout.c revision 1.33
1 /* $NetBSD: linux_exec_aout.c,v 1.33 1998/10/04 00:02:32 fvdl 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 #include <vm/vm_param.h> 59 #include <vm/vm_map.h> 60 61 #include <machine/cpu.h> 62 #include <machine/reg.h> 63 64 #include <compat/linux/common/linux_types.h> 65 #include <compat/linux/common/linux_signal.h> 66 #include <compat/linux/common/linux_siginfo.h> 67 #include <compat/linux/common/linux_util.h> 68 #include <compat/linux/common/linux_exec.h> 69 #include <compat/linux/common/linux_machdep.h> 70 71 #include <compat/linux/linux_syscallargs.h> 72 #include <compat/linux/linux_syscall.h> 73 74 75 static void *linux_aout_copyargs __P((struct exec_package *, 76 struct ps_strings *, void *, void *)); 77 78 #define LINUX_AOUT_AUX_ARGSIZ 2 79 80 extern int linux_error[]; 81 extern char linux_sigcode[], linux_esigcode[]; 82 extern struct sysent linux_sysent[]; 83 extern char *linux_syscallnames[]; 84 85 int exec_linux_aout_prep_zmagic __P((struct proc *, struct exec_package *)); 86 int exec_linux_aout_prep_nmagic __P((struct proc *, struct exec_package *)); 87 int exec_linux_aout_prep_omagic __P((struct proc *, struct exec_package *)); 88 int exec_linux_aout_prep_qmagic __P((struct proc *, struct exec_package *)); 89 90 struct emul emul_linux_aout = { 91 "linux", 92 linux_error, 93 linux_sendsig, 94 LINUX_SYS_syscall, 95 LINUX_SYS_MAXSYSCALL, 96 linux_sysent, 97 linux_syscallnames, 98 LINUX_AOUT_AUX_ARGSIZ, 99 linux_aout_copyargs, 100 linux_setregs, 101 linux_sigcode, 102 linux_esigcode, 103 }; 104 105 static void * 106 linux_aout_copyargs(pack, arginfo, stack, argp) 107 struct exec_package *pack; 108 struct ps_strings *arginfo; 109 void *stack; 110 void *argp; 111 { 112 char **cpp = stack; 113 char **stk = stack; 114 char *dp, *sp; 115 size_t len; 116 void *nullp = NULL; 117 int argc = arginfo->ps_nargvstr; 118 int envc = arginfo->ps_nenvstr; 119 120 if (copyout(&argc, cpp++, sizeof(argc))) 121 return NULL; 122 123 /* leave room for envp and argv */ 124 cpp += 2; 125 if (copyout(&cpp, &stk[1], sizeof (cpp))) 126 return NULL; 127 128 dp = (char *) (cpp + argc + envc + 2); 129 sp = argp; 130 131 /* XXX don't copy them out, remap them! */ 132 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 133 134 for (; --argc >= 0; sp += len, dp += len) 135 if (copyout(&dp, cpp++, sizeof(dp)) || 136 copyoutstr(sp, dp, ARG_MAX, &len)) 137 return NULL; 138 139 if (copyout(&nullp, cpp++, sizeof(nullp))) 140 return NULL; 141 142 if (copyout(&cpp, &stk[2], sizeof (cpp))) 143 return NULL; 144 145 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 146 147 for (; --envc >= 0; sp += len, dp += len) 148 if (copyout(&dp, cpp++, sizeof(dp)) || 149 copyoutstr(sp, dp, ARG_MAX, &len)) 150 return NULL; 151 152 if (copyout(&nullp, cpp++, sizeof(nullp))) 153 return NULL; 154 155 return cpp; 156 } 157 158 int 159 exec_linux_aout_makecmds(p, epp) 160 struct proc *p; 161 struct exec_package *epp; 162 { 163 struct exec *linux_ep = epp->ep_hdr; 164 int machtype, magic; 165 int error = ENOEXEC; 166 167 magic = LINUX_N_MAGIC(linux_ep); 168 machtype = LINUX_N_MACHTYPE(linux_ep); 169 170 171 if (machtype != LINUX_MID_MACHINE) 172 return (ENOEXEC); 173 174 switch (magic) { 175 case QMAGIC: 176 error = exec_linux_aout_prep_qmagic(p, epp); 177 break; 178 case ZMAGIC: 179 error = exec_linux_aout_prep_zmagic(p, epp); 180 break; 181 case NMAGIC: 182 error = exec_linux_aout_prep_nmagic(p, epp); 183 break; 184 case OMAGIC: 185 error = exec_linux_aout_prep_omagic(p, epp); 186 break; 187 } 188 if (error == 0) 189 epp->ep_emul = &emul_linux_aout; 190 return error; 191 } 192 193 /* 194 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 195 * is very likely not page aligned on most architectures, it is treated 196 * as an NMAGIC here. XXX 197 */ 198 199 int 200 exec_linux_aout_prep_zmagic(p, epp) 201 struct proc *p; 202 struct exec_package *epp; 203 { 204 struct exec *execp = epp->ep_hdr; 205 206 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 207 epp->ep_tsize = execp->a_text; 208 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 209 epp->ep_dsize = execp->a_data + execp->a_bss; 210 epp->ep_entry = execp->a_entry; 211 212 /* set up command for text segment */ 213 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 214 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 215 VM_PROT_READ|VM_PROT_EXECUTE); 216 217 /* set up command for data segment */ 218 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 219 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 220 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 221 222 /* set up command for bss segment */ 223 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 224 epp->ep_daddr + execp->a_data, NULLVP, 0, 225 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 226 227 return exec_aout_setup_stack(p, epp); 228 } 229 230 /* 231 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 232 * Not different from the normal stuff. 233 */ 234 235 int 236 exec_linux_aout_prep_nmagic(p, epp) 237 struct proc *p; 238 struct exec_package *epp; 239 { 240 struct exec *execp = epp->ep_hdr; 241 long bsize, baddr; 242 243 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 244 epp->ep_tsize = execp->a_text; 245 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 246 epp->ep_dsize = execp->a_data + execp->a_bss; 247 epp->ep_entry = execp->a_entry; 248 249 /* set up command for text segment */ 250 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 251 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 252 VM_PROT_READ|VM_PROT_EXECUTE); 253 254 /* set up command for data segment */ 255 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 256 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 257 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 258 259 /* set up command for bss segment */ 260 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 261 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 262 if (bsize > 0) 263 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 264 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 265 266 return exec_aout_setup_stack(p, epp); 267 } 268 269 /* 270 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 271 * Business as usual. 272 */ 273 274 int 275 exec_linux_aout_prep_omagic(p, epp) 276 struct proc *p; 277 struct exec_package *epp; 278 { 279 struct exec *execp = epp->ep_hdr; 280 long dsize, bsize, baddr; 281 282 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 283 epp->ep_tsize = execp->a_text; 284 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 285 epp->ep_dsize = execp->a_data + execp->a_bss; 286 epp->ep_entry = execp->a_entry; 287 288 /* set up command for text and data segments */ 289 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 290 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 291 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 292 293 /* set up command for bss segment */ 294 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 295 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 296 if (bsize > 0) 297 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 298 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 299 300 /* 301 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 302 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 303 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 304 * respectively to page boundaries. 305 * Compensate `ep_dsize' for the amount of data covered by the last 306 * text page. 307 */ 308 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 309 epp->ep_dsize = (dsize > 0) ? dsize : 0; 310 return exec_aout_setup_stack(p, epp); 311 } 312 313 int 314 exec_linux_aout_prep_qmagic(p, epp) 315 struct proc *p; 316 struct exec_package *epp; 317 { 318 struct exec *execp = epp->ep_hdr; 319 320 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 321 epp->ep_tsize = execp->a_text; 322 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 323 epp->ep_dsize = execp->a_data + execp->a_bss; 324 epp->ep_entry = execp->a_entry; 325 326 /* 327 * check if vnode is in open for writing, because we want to 328 * demand-page out of it. if it is, don't do it, for various 329 * reasons 330 */ 331 if ((execp->a_text != 0 || execp->a_data != 0) && 332 epp->ep_vp->v_writecount != 0) { 333 #ifdef DIAGNOSTIC 334 if (epp->ep_vp->v_flag & VTEXT) 335 panic("exec: a VTEXT vnode has writecount != 0\n"); 336 #endif 337 return ETXTBSY; 338 } 339 epp->ep_vp->v_flag |= VTEXT; 340 341 /* set up command for text segment */ 342 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 343 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 344 VM_PROT_READ|VM_PROT_EXECUTE); 345 346 /* set up command for data segment */ 347 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 348 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 349 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 350 351 /* set up command for bss segment */ 352 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 353 epp->ep_daddr + execp->a_data, NULLVP, 0, 354 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 355 356 return exec_aout_setup_stack(p, epp); 357 } 358 359 /* 360 * The Linux system call to load shared libraries, a.out version. The 361 * a.out shared libs are just files that are mapped onto a fixed 362 * address in the process' address space. The address is given in 363 * a_entry. Read in the header, set up some VM commands and run them. 364 * 365 * Yes, both text and data are mapped at once, so we're left with 366 * writeable text for the shared libs. The Linux crt0 seemed to break 367 * sometimes when data was mapped seperately. It munmapped a uselib() 368 * of ld.so by hand, which failed with shared text and data for ld.so 369 * Yuck. 370 * 371 * Because of the problem with ZMAGIC executables (text starts 372 * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC 373 * shared libs are not handled very efficiently :-( 374 */ 375 376 int 377 linux_sys_uselib(p, v, retval) 378 struct proc *p; 379 void *v; 380 register_t *retval; 381 { 382 struct linux_sys_uselib_args /* { 383 syscallarg(char *) path; 384 } */ *uap = v; 385 caddr_t sg; 386 long bsize, dsize, tsize, taddr, baddr, daddr; 387 struct nameidata ni; 388 struct vnode *vp; 389 struct exec hdr; 390 struct exec_vmcmd_set vcset; 391 int i, magic, error; 392 size_t rem; 393 394 sg = stackgap_init(p->p_emul); 395 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 396 397 NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); 398 399 if ((error = namei(&ni))) 400 return error; 401 402 vp = ni.ni_vp; 403 404 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE, 405 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, 406 &rem, p))) { 407 vrele(vp); 408 return error; 409 } 410 411 if (rem != 0) { 412 vrele(vp); 413 return ENOEXEC; 414 } 415 416 if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE) 417 return ENOEXEC; 418 419 magic = LINUX_N_MAGIC(&hdr); 420 taddr = hdr.a_entry & (~(NBPG - 1)); 421 tsize = hdr.a_text; 422 daddr = taddr + tsize; 423 dsize = hdr.a_data + hdr.a_bss; 424 425 if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) { 426 vrele(vp); 427 return ETXTBSY; 428 } 429 vp->v_flag |= VTEXT; 430 431 vcset.evs_cnt = 0; 432 vcset.evs_used = 0; 433 434 NEW_VMCMD(&vcset, 435 magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn, 436 hdr.a_text + hdr.a_data, taddr, 437 vp, LINUX_N_TXTOFF(hdr, magic), 438 VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE); 439 440 baddr = roundup(daddr + hdr.a_data, NBPG); 441 bsize = daddr + dsize - baddr; 442 if (bsize > 0) { 443 NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr, 444 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 445 } 446 447 for (i = 0; i < vcset.evs_used && !error; i++) { 448 struct exec_vmcmd *vcp; 449 450 vcp = &vcset.evs_cmds[i]; 451 error = (*vcp->ev_proc)(p, vcp); 452 } 453 454 kill_vmcmds(&vcset); 455 456 vrele(vp); 457 458 return error; 459 } 460
Indexes created Tue Sep 23 20:09:58 GMT 2025