69b8756d3d
explicit process at fork trampoline path instead of eventhadler(schedtail) invocation for each child process. Remove eventhandler(schedtail) code and change linux ABI to use newly added sysvec method. While here replace explicit comparing of module sysentvec structure with the newly created process sysentvec to detect the linux ABI. Discussed with: kib MFC after: 2 Week
315 lines
8.6 KiB
C
315 lines
8.6 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* XXX we use functions that might not exist. */
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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#include <sys/fcntl.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/socket.h>
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#include <sys/syscallsubr.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <sys/exec.h>
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#include <sys/kernel.h>
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#include <machine/cpu.h>
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#include <netinet/in.h>
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#include <compat/svr4/svr4.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_syscall.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_socket.h>
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#include <compat/svr4/svr4_sockio.h>
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#include <compat/svr4/svr4_errno.h>
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#include <compat/svr4/svr4_proto.h>
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#include <compat/svr4/svr4_siginfo.h>
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#include <compat/svr4/svr4_util.h>
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int bsd_to_svr4_errno[ELAST+1] = {
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0,
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SVR4_EPERM,
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SVR4_ENOENT,
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SVR4_ESRCH,
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SVR4_EINTR,
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SVR4_EIO,
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SVR4_ENXIO,
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SVR4_E2BIG,
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SVR4_ENOEXEC,
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SVR4_EBADF,
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SVR4_ECHILD,
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SVR4_EDEADLK,
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SVR4_ENOMEM,
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SVR4_EACCES,
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SVR4_EFAULT,
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SVR4_ENOTBLK,
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SVR4_EBUSY,
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SVR4_EEXIST,
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SVR4_EXDEV,
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SVR4_ENODEV,
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SVR4_ENOTDIR,
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SVR4_EISDIR,
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SVR4_EINVAL,
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SVR4_ENFILE,
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SVR4_EMFILE,
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SVR4_ENOTTY,
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SVR4_ETXTBSY,
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SVR4_EFBIG,
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SVR4_ENOSPC,
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SVR4_ESPIPE,
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SVR4_EROFS,
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SVR4_EMLINK,
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SVR4_EPIPE,
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SVR4_EDOM,
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SVR4_ERANGE,
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SVR4_EAGAIN,
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SVR4_EINPROGRESS,
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SVR4_EALREADY,
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SVR4_ENOTSOCK,
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SVR4_EDESTADDRREQ,
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SVR4_EMSGSIZE,
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SVR4_EPROTOTYPE,
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SVR4_ENOPROTOOPT,
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SVR4_EPROTONOSUPPORT,
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SVR4_ESOCKTNOSUPPORT,
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SVR4_EOPNOTSUPP,
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SVR4_EPFNOSUPPORT,
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SVR4_EAFNOSUPPORT,
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SVR4_EADDRINUSE,
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SVR4_EADDRNOTAVAIL,
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SVR4_ENETDOWN,
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SVR4_ENETUNREACH,
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SVR4_ENETRESET,
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SVR4_ECONNABORTED,
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SVR4_ECONNRESET,
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SVR4_ENOBUFS,
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SVR4_EISCONN,
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SVR4_ENOTCONN,
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SVR4_ESHUTDOWN,
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SVR4_ETOOMANYREFS,
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SVR4_ETIMEDOUT,
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SVR4_ECONNREFUSED,
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SVR4_ELOOP,
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SVR4_ENAMETOOLONG,
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SVR4_EHOSTDOWN,
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SVR4_EHOSTUNREACH,
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SVR4_ENOTEMPTY,
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SVR4_EPROCLIM,
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SVR4_EUSERS,
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SVR4_EDQUOT,
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SVR4_ESTALE,
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SVR4_EREMOTE,
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SVR4_EBADRPC,
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SVR4_ERPCMISMATCH,
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SVR4_EPROGUNAVAIL,
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SVR4_EPROGMISMATCH,
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SVR4_EPROCUNAVAIL,
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SVR4_ENOLCK,
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SVR4_ENOSYS,
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SVR4_EFTYPE,
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SVR4_EAUTH,
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SVR4_ENEEDAUTH,
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SVR4_EIDRM,
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SVR4_ENOMSG,
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};
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static int svr4_fixup(register_t **stack_base, struct image_params *imgp);
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extern struct sysent svr4_sysent[];
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#undef szsigcode
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#undef sigcode
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extern int svr4_szsigcode;
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extern char svr4_sigcode[];
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struct sysentvec svr4_sysvec = {
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.sv_size = SVR4_SYS_MAXSYSCALL,
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.sv_table = svr4_sysent,
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.sv_mask = 0xff,
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.sv_sigsize = SVR4_NSIG-1, /* NB: signal trans table indexed with signno-1 */
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.sv_sigtbl = bsd_to_svr4_sig+1,
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.sv_errsize = ELAST, /* ELAST */
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.sv_errtbl = bsd_to_svr4_errno,
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.sv_transtrap = NULL,
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.sv_fixup = svr4_fixup,
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.sv_sendsig = svr4_sendsig,
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.sv_sigcode = svr4_sigcode,
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.sv_szsigcode = &svr4_szsigcode,
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.sv_prepsyscall = NULL,
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.sv_name = "SVR4",
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.sv_coredump = elf32_coredump,
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.sv_imgact_try = NULL,
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.sv_minsigstksz = SVR4_MINSIGSTKSZ,
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.sv_pagesize = PAGE_SIZE,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS,
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = exec_copyout_strings,
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.sv_setregs = exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = cpu_set_syscall_retval,
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.sv_fetch_syscall_args = cpu_fetch_syscall_args,
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.sv_syscallnames = NULL,
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.sv_schedtail = NULL,
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};
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const char svr4_emul_path[] = "/compat/svr4";
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Elf32_Brandinfo svr4_brand = {
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.brand = ELFOSABI_SYSV,
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.machine = EM_386, /* XXX only implemented for x86 so far. */
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.compat_3_brand = "SVR4",
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.emul_path = svr4_emul_path,
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.interp_path = "/lib/libc.so.1",
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.sysvec = &svr4_sysvec,
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.interp_newpath = NULL,
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.brand_note = NULL,
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.flags = 0
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};
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static int
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svr4_fixup(register_t **stack_base, struct image_params *imgp)
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{
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Elf32_Auxargs *args;
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register_t *pos;
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KASSERT(curthread->td_proc == imgp->proc,
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("unsafe svr4_fixup(), should be curproc"));
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args = (Elf32_Auxargs *)imgp->auxargs;
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pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
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if (args->execfd != -1)
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AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
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AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
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AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
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AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
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AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
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AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
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AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
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AUXARGS_ENTRY(pos, AT_BASE, args->base);
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AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
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AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
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AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
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AUXARGS_ENTRY(pos, AT_NULL, 0);
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free(imgp->auxargs, M_TEMP);
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imgp->auxargs = NULL;
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(*stack_base)--;
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**stack_base = (register_t)imgp->args->argc;
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return 0;
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}
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/*
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* Search an alternate path before passing pathname arguments on
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* to system calls. Useful for keeping a separate 'emulation tree'.
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*
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* If cflag is set, we check if an attempt can be made to create
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* the named file, i.e. we check if the directory it should
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* be in exists.
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*/
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int
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svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg,
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char **pbuf, int create)
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{
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return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf,
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create, AT_FDCWD));
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}
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static int
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svr4_elf_modevent(module_t mod, int type, void *data)
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{
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int error;
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error = 0;
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switch(type) {
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case MOD_LOAD:
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if (elf32_insert_brand_entry(&svr4_brand) < 0) {
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printf("cannot insert svr4 elf brand handler\n");
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error = EINVAL;
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break;
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}
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if (bootverbose)
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printf("svr4 ELF exec handler installed\n");
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svr4_sockcache_init();
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break;
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case MOD_UNLOAD:
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/* Only allow the emulator to be removed if it isn't in use. */
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if (elf32_brand_inuse(&svr4_brand) != 0) {
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error = EBUSY;
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} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
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error = EINVAL;
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}
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if (error) {
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printf("Could not deinstall ELF interpreter entry (error %d)\n",
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error);
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break;
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}
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if (bootverbose)
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printf("svr4 ELF exec handler removed\n");
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svr4_sockcache_destroy();
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break;
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default:
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return (EOPNOTSUPP);
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break;
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}
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return error;
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}
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static moduledata_t svr4_elf_mod = {
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"svr4elf",
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svr4_elf_modevent,
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0
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};
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DECLARE_MODULE_TIED(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
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MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
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