Annotation of sys/compat/linux/linux_exec.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: linux_exec.c,v 1.25 2006/01/19 17:54:52 mickey Exp $ */
! 2: /* $NetBSD: linux_exec.c,v 1.13 1996/04/05 00:01:10 christos Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1994, 1995, 1998, 2000 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
! 10: * Thor Lancelot Simon.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: #include <sys/param.h>
! 42: #include <sys/systm.h>
! 43: #include <sys/kernel.h>
! 44: #include <sys/proc.h>
! 45: #include <sys/malloc.h>
! 46: #include <sys/namei.h>
! 47: #include <sys/vnode.h>
! 48: #include <sys/mount.h>
! 49: #include <sys/exec.h>
! 50: #include <sys/exec_elf.h>
! 51: #include <sys/exec_olf.h>
! 52:
! 53: #include <sys/mman.h>
! 54: #include <sys/syscallargs.h>
! 55:
! 56: #include <uvm/uvm_extern.h>
! 57:
! 58: #include <machine/cpu.h>
! 59: #include <machine/reg.h>
! 60: #include <machine/linux_machdep.h>
! 61:
! 62: #include <compat/linux/linux_types.h>
! 63: #include <compat/linux/linux_syscall.h>
! 64: #include <compat/linux/linux_signal.h>
! 65: #include <compat/linux/linux_syscallargs.h>
! 66: #include <compat/linux/linux_util.h>
! 67: #include <compat/linux/linux_exec.h>
! 68: #include <compat/linux/linux_emuldata.h>
! 69:
! 70: static void *linux_aout_copyargs(struct exec_package *,
! 71: struct ps_strings *, void *, void *);
! 72:
! 73: #define LINUX_AOUT_AUX_ARGSIZ 2
! 74: #define LINUX_ELF_AUX_ARGSIZ (sizeof(AuxInfo) * 8 / sizeof(char *))
! 75:
! 76:
! 77: const char linux_emul_path[] = "/emul/linux";
! 78: extern int linux_error[];
! 79: extern char linux_sigcode[], linux_esigcode[];
! 80: extern struct sysent linux_sysent[];
! 81: #ifdef SYSCALL_DEBUG
! 82: extern char *linux_syscallnames[];
! 83: #endif
! 84:
! 85: int exec_linux_aout_prep_zmagic(struct proc *, struct exec_package *);
! 86: int exec_linux_aout_prep_nmagic(struct proc *, struct exec_package *);
! 87: int exec_linux_aout_prep_omagic(struct proc *, struct exec_package *);
! 88: int exec_linux_aout_prep_qmagic(struct proc *, struct exec_package *);
! 89:
! 90: void linux_e_proc_exec(struct proc *, struct exec_package *);
! 91: void linux_e_proc_fork(struct proc *, struct proc *);
! 92: void linux_e_proc_exit(struct proc *);
! 93: void linux_e_proc_init(struct proc *, struct vmspace *);
! 94:
! 95: struct emul emul_linux_aout = {
! 96: "linux",
! 97: linux_error,
! 98: linux_sendsig,
! 99: LINUX_SYS_syscall,
! 100: LINUX_SYS_MAXSYSCALL,
! 101: linux_sysent,
! 102: #ifdef SYSCALL_DEBUG
! 103: linux_syscallnames,
! 104: #else
! 105: NULL,
! 106: #endif
! 107: LINUX_AOUT_AUX_ARGSIZ,
! 108: linux_aout_copyargs,
! 109: setregs,
! 110: NULL,
! 111: linux_sigcode,
! 112: linux_esigcode,
! 113: 0,
! 114: NULL,
! 115: linux_e_proc_exec,
! 116: linux_e_proc_fork,
! 117: linux_e_proc_exit,
! 118: };
! 119:
! 120: struct emul emul_linux_elf = {
! 121: "linux",
! 122: linux_error,
! 123: linux_sendsig,
! 124: LINUX_SYS_syscall,
! 125: LINUX_SYS_MAXSYSCALL,
! 126: linux_sysent,
! 127: #ifdef SYSCALL_DEBUG
! 128: linux_syscallnames,
! 129: #else
! 130: NULL,
! 131: #endif
! 132: LINUX_ELF_AUX_ARGSIZ,
! 133: elf32_copyargs,
! 134: setregs,
! 135: exec_elf32_fixup,
! 136: linux_sigcode,
! 137: linux_esigcode,
! 138: 0,
! 139: NULL,
! 140: linux_e_proc_exec,
! 141: linux_e_proc_fork,
! 142: linux_e_proc_exit,
! 143: };
! 144:
! 145: /*
! 146: * Allocate per-process structures. Called when executing Linux
! 147: * process. We can reuse the old emuldata - if it's not null,
! 148: * the executed process is of same emulation as original forked one.
! 149: */
! 150: void
! 151: linux_e_proc_init(p, vmspace)
! 152: struct proc *p;
! 153: struct vmspace *vmspace;
! 154: {
! 155: if (!p->p_emuldata) {
! 156: /* allocate new Linux emuldata */
! 157: MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata),
! 158: M_EMULDATA, M_WAITOK);
! 159: }
! 160:
! 161: memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata));
! 162:
! 163: /* Set the process idea of the break to the real value */
! 164: ((struct linux_emuldata *)(p->p_emuldata))->p_break =
! 165: vmspace->vm_daddr + ctob(vmspace->vm_dsize);
! 166: }
! 167:
! 168: void
! 169: linux_e_proc_exec(p, epp)
! 170: struct proc *p;
! 171: struct exec_package *epp;
! 172: {
! 173: /* exec, use our vmspace */
! 174: linux_e_proc_init(p, p->p_vmspace);
! 175: }
! 176:
! 177: /*
! 178: * Emulation per-process exit hook.
! 179: */
! 180: void
! 181: linux_e_proc_exit(p)
! 182: struct proc *p;
! 183: {
! 184: /* free Linux emuldata and set the pointer to null */
! 185: FREE(p->p_emuldata, M_EMULDATA);
! 186: p->p_emuldata = NULL;
! 187: }
! 188:
! 189: /*
! 190: * Emulation fork hook.
! 191: */
! 192: void
! 193: linux_e_proc_fork(p, parent)
! 194: struct proc *p, *parent;
! 195: {
! 196: /*
! 197: * It could be desirable to copy some stuff from parent's
! 198: * emuldata. We don't need anything like that for now.
! 199: * So just allocate new emuldata for the new process.
! 200: */
! 201: p->p_emuldata = NULL;
! 202:
! 203: /* fork, use parent's vmspace (our vmspace may not be setup yet) */
! 204: linux_e_proc_init(p, parent->p_vmspace);
! 205: }
! 206:
! 207: static void *
! 208: linux_aout_copyargs(pack, arginfo, stack, argp)
! 209: struct exec_package *pack;
! 210: struct ps_strings *arginfo;
! 211: void *stack;
! 212: void *argp;
! 213: {
! 214: char **cpp = stack;
! 215: char **stk = stack;
! 216: char *dp, *sp;
! 217: size_t len;
! 218: void *nullp = NULL;
! 219: int argc = arginfo->ps_nargvstr;
! 220: int envc = arginfo->ps_nenvstr;
! 221:
! 222: if (copyout(&argc, cpp++, sizeof(argc)))
! 223: return (NULL);
! 224:
! 225: /* leave room for envp and argv */
! 226: cpp += 2;
! 227: if (copyout(&cpp, &stk[1], sizeof (cpp)))
! 228: return (NULL);
! 229:
! 230: dp = (char *)(cpp + argc + envc + 2);
! 231: sp = argp;
! 232:
! 233: /* XXX don't copy them out, remap them! */
! 234: arginfo->ps_argvstr = cpp; /* remember location of argv for later */
! 235:
! 236: for (; --argc >= 0; sp += len, dp += len)
! 237: if (copyout(&dp, cpp++, sizeof(dp)) ||
! 238: copyoutstr(sp, dp, ARG_MAX, &len))
! 239: return (NULL);
! 240:
! 241: if (copyout(&nullp, cpp++, sizeof(nullp)))
! 242: return (NULL);
! 243:
! 244: if (copyout(&cpp, &stk[2], sizeof (cpp)))
! 245: return (NULL);
! 246:
! 247: arginfo->ps_envstr = cpp; /* remember location of envp for later */
! 248:
! 249: for (; --envc >= 0; sp += len, dp += len)
! 250: if (copyout(&dp, cpp++, sizeof(dp)) ||
! 251: copyoutstr(sp, dp, ARG_MAX, &len))
! 252: return (NULL);
! 253:
! 254: if (copyout(&nullp, cpp++, sizeof(nullp)))
! 255: return (NULL);
! 256:
! 257: return (cpp);
! 258: }
! 259:
! 260: int
! 261: exec_linux_aout_makecmds(p, epp)
! 262: struct proc *p;
! 263: struct exec_package *epp;
! 264: {
! 265: struct exec *linux_ep = epp->ep_hdr;
! 266: int machtype, magic;
! 267: int error = ENOEXEC;
! 268:
! 269: if (epp->ep_hdrvalid < sizeof(struct exec))
! 270: return (ENOEXEC);
! 271:
! 272: magic = LINUX_N_MAGIC(linux_ep);
! 273: machtype = LINUX_N_MACHTYPE(linux_ep);
! 274:
! 275:
! 276: if (machtype != LINUX_MID_MACHINE)
! 277: return (ENOEXEC);
! 278:
! 279: switch (magic) {
! 280: case QMAGIC:
! 281: error = exec_linux_aout_prep_qmagic(p, epp);
! 282: break;
! 283: case ZMAGIC:
! 284: error = exec_linux_aout_prep_zmagic(p, epp);
! 285: break;
! 286: case NMAGIC:
! 287: error = exec_linux_aout_prep_nmagic(p, epp);
! 288: break;
! 289: case OMAGIC:
! 290: error = exec_linux_aout_prep_omagic(p, epp);
! 291: break;
! 292: }
! 293: if (error == 0)
! 294: epp->ep_emul = &emul_linux_aout;
! 295: return (error);
! 296: }
! 297:
! 298: /*
! 299: * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
! 300: * is very likely not page aligned on most architectures, it is treated
! 301: * as an NMAGIC here. XXX
! 302: */
! 303:
! 304: int
! 305: exec_linux_aout_prep_zmagic(p, epp)
! 306: struct proc *p;
! 307: struct exec_package *epp;
! 308: {
! 309: struct exec *execp = epp->ep_hdr;
! 310:
! 311: epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
! 312: epp->ep_tsize = execp->a_text;
! 313: epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
! 314: epp->ep_dsize = execp->a_data + execp->a_bss;
! 315: epp->ep_entry = execp->a_entry;
! 316:
! 317: /* set up command for text segment */
! 318: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
! 319: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
! 320: VM_PROT_READ|VM_PROT_EXECUTE);
! 321:
! 322: /* set up command for data segment */
! 323: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
! 324: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
! 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_setup_stack(p, epp));
! 333: }
! 334:
! 335: /*
! 336: * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
! 337: * Not different from the normal stuff.
! 338: */
! 339:
! 340: int
! 341: exec_linux_aout_prep_nmagic(p, epp)
! 342: struct proc *p;
! 343: struct exec_package *epp;
! 344: {
! 345: struct exec *execp = epp->ep_hdr;
! 346: long bsize, baddr;
! 347:
! 348: epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
! 349: epp->ep_tsize = execp->a_text;
! 350: epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
! 351: epp->ep_dsize = execp->a_data + execp->a_bss;
! 352: epp->ep_entry = execp->a_entry;
! 353:
! 354: /* set up command for text segment */
! 355: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
! 356: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
! 357: VM_PROT_READ|VM_PROT_EXECUTE);
! 358:
! 359: /* set up command for data segment */
! 360: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
! 361: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
! 362: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 363:
! 364: /* set up command for bss segment */
! 365: baddr = round_page(epp->ep_daddr + execp->a_data);
! 366: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 367: if (bsize > 0)
! 368: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 369: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 370:
! 371: return (exec_setup_stack(p, epp));
! 372: }
! 373:
! 374: /*
! 375: * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
! 376: * Business as usual.
! 377: */
! 378:
! 379: int
! 380: exec_linux_aout_prep_omagic(p, epp)
! 381: struct proc *p;
! 382: struct exec_package *epp;
! 383: {
! 384: struct exec *execp = epp->ep_hdr;
! 385: long dsize, bsize, baddr;
! 386:
! 387: epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
! 388: epp->ep_tsize = execp->a_text;
! 389: epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
! 390: epp->ep_dsize = execp->a_data + execp->a_bss;
! 391: epp->ep_entry = execp->a_entry;
! 392:
! 393: /* set up command for text and data segments */
! 394: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
! 395: execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
! 396: LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 397:
! 398: /* set up command for bss segment */
! 399: baddr = round_page(epp->ep_daddr + execp->a_data);
! 400: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 401: if (bsize > 0)
! 402: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 403: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 404:
! 405: /*
! 406: * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
! 407: * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
! 408: * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
! 409: * respectively to page boundaries.
! 410: * Compensate `ep_dsize' for the amount of data covered by the last
! 411: * text page.
! 412: */
! 413: dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
! 414: epp->ep_dsize = (dsize > 0) ? dsize : 0;
! 415: return (exec_setup_stack(p, epp));
! 416: }
! 417:
! 418: int
! 419: exec_linux_aout_prep_qmagic(p, epp)
! 420: struct proc *p;
! 421: struct exec_package *epp;
! 422: {
! 423: struct exec *execp = epp->ep_hdr;
! 424:
! 425: epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
! 426: epp->ep_tsize = execp->a_text;
! 427: epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
! 428: epp->ep_dsize = execp->a_data + execp->a_bss;
! 429: epp->ep_entry = execp->a_entry;
! 430:
! 431: /*
! 432: * check if vnode is in open for writing, because we want to
! 433: * demand-page out of it. if it is, don't do it, for various
! 434: * reasons
! 435: */
! 436: if ((execp->a_text != 0 || execp->a_data != 0) &&
! 437: epp->ep_vp->v_writecount != 0) {
! 438: #ifdef DIAGNOSTIC
! 439: if (epp->ep_vp->v_flag & VTEXT)
! 440: panic("exec: a VTEXT vnode has writecount != 0");
! 441: #endif
! 442: return (ETXTBSY);
! 443: }
! 444: vn_marktext(epp->ep_vp);
! 445:
! 446: /* set up command for text segment */
! 447: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
! 448: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
! 449: VM_PROT_READ|VM_PROT_EXECUTE);
! 450:
! 451: /* set up command for data segment */
! 452: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
! 453: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
! 454: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 455:
! 456: /* set up command for bss segment */
! 457: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
! 458: epp->ep_daddr + execp->a_data, NULLVP, 0,
! 459: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 460:
! 461: return (exec_setup_stack(p, epp));
! 462: }
! 463:
! 464: int
! 465: exec_linux_elf32_makecmds(struct proc *p, struct exec_package *epp)
! 466: {
! 467: if (!(emul_linux_elf.e_flags & EMUL_ENABLED))
! 468: return (ENOEXEC);
! 469: return exec_elf32_makecmds(p, epp);
! 470: }
! 471:
! 472: int
! 473: linux_elf_probe(p, epp, itp, pos, os)
! 474: struct proc *p;
! 475: struct exec_package *epp;
! 476: char *itp;
! 477: u_long *pos;
! 478: u_int8_t *os;
! 479: {
! 480: Elf32_Ehdr *eh = epp->ep_hdr;
! 481: char *bp, *brand;
! 482: int error;
! 483: size_t len;
! 484:
! 485: brand = elf32_check_brand(eh);
! 486: if (brand && strcmp(brand, "Linux"))
! 487: return (EINVAL);
! 488: if (itp) {
! 489: if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
! 490: return (error);
! 491: if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
! 492: return (error);
! 493: free(bp, M_TEMP);
! 494: }
! 495: epp->ep_emul = &emul_linux_elf;
! 496: *pos = ELF32_NO_ADDR;
! 497: if (*os == OOS_NULL)
! 498: *os = OOS_LINUX;
! 499: return (0);
! 500: }
! 501:
! 502: /*
! 503: * The Linux system call to load shared libraries, a.out version. The
! 504: * a.out shared libs are just files that are mapped onto a fixed
! 505: * address in the process' address space. The address is given in
! 506: * a_entry. Read in the header, set up some VM commands and run them.
! 507: *
! 508: * Yes, both text and data are mapped at once, so we're left with
! 509: * writeable text for the shared libs. The Linux crt0 seemed to break
! 510: * sometimes when data was mapped separately. It munmapped a uselib()
! 511: * of ld.so by hand, which failed with shared text and data for ld.so
! 512: * Yuck.
! 513: *
! 514: * Because of the problem with ZMAGIC executables (text starts
! 515: * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC
! 516: * shared libs are not handled very efficiently :-(
! 517: */
! 518:
! 519: int
! 520: linux_sys_uselib(p, v, retval)
! 521: struct proc *p;
! 522: void *v;
! 523: register_t *retval;
! 524: {
! 525: struct linux_sys_uselib_args /* {
! 526: syscallarg(char *) path;
! 527: } */ *uap = v;
! 528: caddr_t sg;
! 529: long bsize, dsize, tsize, taddr, baddr, daddr;
! 530: struct nameidata ni;
! 531: struct vnode *vp;
! 532: struct exec hdr;
! 533: struct exec_vmcmd_set vcset;
! 534: int i, magic, error;
! 535: size_t rem;
! 536:
! 537: sg = stackgap_init(p->p_emul);
! 538: LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
! 539:
! 540: NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
! 541:
! 542: if ((error = namei(&ni)))
! 543: return (error);
! 544:
! 545: vp = ni.ni_vp;
! 546:
! 547: if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
! 548: 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
! 549: &rem, p))) {
! 550: vrele(vp);
! 551: return (error);
! 552: }
! 553:
! 554: if (rem != 0) {
! 555: vrele(vp);
! 556: return (ENOEXEC);
! 557: }
! 558:
! 559: if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE)
! 560: return (ENOEXEC);
! 561:
! 562: magic = LINUX_N_MAGIC(&hdr);
! 563: taddr = trunc_page(hdr.a_entry);
! 564: tsize = hdr.a_text;
! 565: daddr = taddr + tsize;
! 566: dsize = hdr.a_data + hdr.a_bss;
! 567:
! 568: if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
! 569: vrele(vp);
! 570: return (ETXTBSY);
! 571: }
! 572: vn_marktext(vp);
! 573:
! 574: VMCMDSET_INIT(&vcset);
! 575:
! 576: NEW_VMCMD(
! 577: &vcset, magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
! 578: hdr.a_text + hdr.a_data, taddr, vp, LINUX_N_TXTOFF(hdr, magic),
! 579: VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
! 580:
! 581: baddr = round_page(daddr + hdr.a_data);
! 582: bsize = daddr + dsize - baddr;
! 583: if (bsize > 0) {
! 584: NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
! 585: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 586: }
! 587:
! 588: for (i = 0; i < vcset.evs_used && !error; i++) {
! 589: struct exec_vmcmd *vcp;
! 590:
! 591: vcp = &vcset.evs_cmds[i];
! 592: error = (*vcp->ev_proc)(p, vcp);
! 593: }
! 594:
! 595: kill_vmcmds(&vcset);
! 596:
! 597: vrele(vp);
! 598:
! 599: return (error);
! 600: }
! 601:
! 602: /*
! 603: * Execve(2). Just check the alternate emulation path, and pass it on
! 604: * to the regular execve().
! 605: */
! 606: int
! 607: linux_sys_execve(p, v, retval)
! 608: struct proc *p;
! 609: void *v;
! 610: register_t *retval;
! 611: {
! 612: struct linux_sys_execve_args /* {
! 613: syscallarg(char *) path;
! 614: syscallarg(char **) argv;
! 615: syscallarg(char **) envp;
! 616: } */ *uap = v;
! 617: struct sys_execve_args ap;
! 618: caddr_t sg;
! 619:
! 620: sg = stackgap_init(p->p_emul);
! 621: LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
! 622:
! 623: SCARG(&ap, path) = SCARG(uap, path);
! 624: SCARG(&ap, argp) = SCARG(uap, argp);
! 625: SCARG(&ap, envp) = SCARG(uap, envp);
! 626:
! 627: return (sys_execve(p, &ap, retval));
! 628: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to linux_exec.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / compat / linux