259 lines
7.4 KiB
C
259 lines
7.4 KiB
C
/* $NetBSD: linux32_exec_elf32.c,v 1.7 2007/04/22 08:29:57 dsl Exp $ */
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/*-
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* Copyright (c) 1995, 1998, 2000, 2001,2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
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* Emmanuel Dreyfus.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.7 2007/04/22 08:29:57 dsl Exp $");
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#define ELFSIZE 32
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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/malloc.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <sys/kauth.h>
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#include <sys/kernel.h>
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#include <sys/resourcevar.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <compat/linux/common/linux_exec.h>
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#include <compat/netbsd32/netbsd32.h>
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#include <compat/netbsd32/netbsd32_exec.h>
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#include <compat/linux32/common/linux32_exec.h>
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#include <machine/frame.h>
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#ifdef DEBUG_LINUX
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#define DPRINTF(a) uprintf a
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#else
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#define DPRINTF(a)
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#endif
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int linux32_copyinargs(struct exec_package *, struct ps_strings *,
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void *, size_t, const void *, const void *);
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int
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ELFNAME2(linux32,probe)(l, epp, eh, itp, pos)
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struct lwp *l;
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struct exec_package *epp;
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void *eh;
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char *itp;
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vaddr_t *pos;
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{
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int error;
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if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) &&
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#ifdef LINUX32_GCC_SIGNATURE
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((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) &&
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#endif
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#ifdef LINUX32_ATEXIT_SIGNATURE
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((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) &&
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#endif
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#ifdef LINUX32_DEBUGLINK_SIGNATURE
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((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) &&
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#endif
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1)
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return error;
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if (itp) {
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if ((error = emul_find_interp(l, epp, itp)))
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return (error);
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}
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#if 0
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DPRINTF(("linux32_probe: returning 0\n"));
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#endif
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epp->ep_flags |= EXEC_32;
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epp->ep_vm_minaddr = VM_MIN_ADDRESS;
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epp->ep_vm_maxaddr = USRSTACK32;
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return 0;
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}
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/* round up and down to page boundaries. */
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#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
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#define ELF_TRUNC(a, b) ((a) & ~((b) - 1))
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/*
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* Copy arguments onto the stack in the normal way, but add some
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* extra information in case of dynamic binding.
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*/
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int
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linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack,
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struct ps_strings *arginfo, char **stackp, void *argp)
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{
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struct linux32_extra_stack_data *esdp, esd;
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struct elf_args *ap;
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struct vattr *vap;
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Elf_Ehdr *eh;
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Elf_Phdr *ph;
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Elf_Addr phdr = 0;
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u_long phsize;
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int error;
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int i;
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if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0)
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return error;
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/*
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* Push extra arguments on the stack needed by dynamically
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* linked binaries and static binaries as well.
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*/
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memset(&esd, 0, sizeof(esd));
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esdp = (struct linux32_extra_stack_data *)(*stackp);
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ap = (struct elf_args *)pack->ep_emul_arg;
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vap = pack->ep_vap;
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eh = (Elf_Ehdr *)pack->ep_hdr;
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/*
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* We forgot this, so we ned to reload it now. XXX keep track of it?
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*/
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if (ap == NULL) {
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phsize = eh->e_phnum * sizeof(Elf_Phdr);
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ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
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error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize);
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if (error != 0) {
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for (i = 0; i < eh->e_phnum; i++) {
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if (ph[i].p_type == PT_PHDR) {
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phdr = ph[i].p_vaddr;
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break;
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}
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}
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}
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free(ph, M_TEMP);
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}
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/*
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* The exec_package doesn't have a proc pointer and it's not
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* exactly trivial to add one since the credentials are
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* changing. XXX Linux uses curlwp's credentials.
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* Why can't we use them too? XXXad we do now; what's different
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* about Linux's LWP creds?
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*/
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i = 0;
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esd.ai[i].a_type = LINUX_AT_SYSINFO;
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esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]);
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esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR;
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esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr);
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esd.ai[i].a_type = LINUX_AT_HWCAP;
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esd.ai[i++].a_v = LINUX32_CPUCAP;
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esd.ai[i].a_type = AT_PAGESZ;
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esd.ai[i++].a_v = PAGE_SIZE;
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esd.ai[i].a_type = LINUX_AT_CLKTCK;
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esd.ai[i++].a_v = hz;
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esd.ai[i].a_type = AT_PHDR;
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esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr);
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esd.ai[i].a_type = AT_PHENT;
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esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize);
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esd.ai[i].a_type = AT_PHNUM;
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esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum);
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esd.ai[i].a_type = AT_BASE;
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esd.ai[i++].a_v = (ap ? ap->arg_interp : 0);
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esd.ai[i].a_type = AT_FLAGS;
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esd.ai[i++].a_v = 0;
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esd.ai[i].a_type = AT_ENTRY;
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esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry);
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esd.ai[i].a_type = LINUX_AT_EGID;
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esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ?
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vap->va_gid : kauth_cred_getegid(l->l_cred));
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esd.ai[i].a_type = LINUX_AT_GID;
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esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred);
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esd.ai[i].a_type = LINUX_AT_EUID;
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esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ?
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vap->va_uid : kauth_cred_geteuid(l->l_cred));
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esd.ai[i].a_type = LINUX_AT_UID;
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esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred);
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esd.ai[i].a_type = LINUX_AT_SECURE;
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esd.ai[i++].a_v = 0;
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esd.ai[i].a_type = LINUX_AT_PLATFORM;
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esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]);
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esd.ai[i].a_type = AT_NULL;
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esd.ai[i++].a_v = 0;
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#ifdef DEBUG_LINUX
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if (i != LINUX32_ELF_AUX_ENTRIES) {
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printf("linux32_elf32_copyargs: %d Aux entries\n", i);
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return EINVAL;
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}
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#endif
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memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall,
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sizeof(linux32_kernel_vsyscall));
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memcpy(&esd.elfhdr, eh, sizeof(*eh));
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strcpy(esd.hw_platform, LINUX32_PLATFORM);
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if (ap) {
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free((char *)ap, M_TEMP);
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pack->ep_emul_arg = NULL;
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}
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/*
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* Copy out the ELF auxiliary table and hw platform name
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*/
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if ((error = copyout(&esd, esdp, sizeof(esd))) != 0)
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return error;
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*stackp += sizeof(esd);
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return 0;
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}
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