NetBSD/sys/compat/linux/common/linux_uselib.c

174 lines
5.4 KiB
C

/* $NetBSD: linux_uselib.c,v 1.5 2001/11/13 02:09:01 lukem Exp $ */
/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_uselib.c,v 1.5 2001/11/13 02:09:01 lukem Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/mman.h>
#include <sys/syscallargs.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_exec.h>
#include <compat/linux/common/linux_machdep.h>
#ifndef EXEC_AOUT
/* define EXEC_AOUT to get prototype from linux_syscall.h */
#define EXEC_AOUT
#endif
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_syscall.h>
/*
* The Linux system call to load shared libraries, a.out version. The
* a.out shared libs are just files that are mapped onto a fixed
* address in the process' address space. The address is given in
* a_entry. Read in the header, set up some VM commands and run them.
*
* Yes, both text and data are mapped at once, so we're left with
* writeable text for the shared libs. The Linux crt0 seemed to break
* sometimes when data was mapped separately. It munmapped a uselib()
* of ld.so by hand, which failed with shared text and data for ld.so
* Yuck.
*
* Because of the problem with ZMAGIC executables (text starts
* at 0x400 in the file, but needs to be mapped at 0), ZMAGIC
* shared libs are not handled very efficiently :-(
*/
int
linux_sys_uselib(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uselib_args /* {
syscallarg(const char *) path;
} */ *uap = v;
caddr_t sg;
long bsize, dsize, tsize, taddr, baddr, daddr;
struct nameidata ni;
struct vnode *vp;
struct exec hdr;
struct exec_vmcmd_set vcset;
int i, magic, error;
size_t rem;
sg = stackgap_init(p->p_emul);
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&ni)))
return error;
vp = ni.ni_vp;
if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
&rem, p))) {
vrele(vp);
return error;
}
if (rem != 0) {
vrele(vp);
return ENOEXEC;
}
if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE)
return ENOEXEC;
magic = LINUX_N_MAGIC(&hdr);
taddr = hdr.a_entry & (~(NBPG - 1));
tsize = hdr.a_text;
daddr = taddr + tsize;
dsize = hdr.a_data + hdr.a_bss;
if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
vrele(vp);
return ETXTBSY;
}
vp->v_flag |= VTEXT;
vcset.evs_cnt = 0;
vcset.evs_used = 0;
NEW_VMCMD(&vcset,
magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
hdr.a_text + hdr.a_data, taddr,
vp, LINUX_N_TXTOFF(hdr, magic),
VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
baddr = roundup(daddr + hdr.a_data, NBPG);
bsize = daddr + dsize - baddr;
if (bsize > 0) {
NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
}
for (i = 0; i < vcset.evs_used && !error; i++) {
struct exec_vmcmd *vcp;
vcp = &vcset.evs_cmds[i];
error = (*vcp->ev_proc)(p, vcp);
}
kill_vmcmds(&vcset);
vrele(vp);
return error;
}