NetBSD-5.0.2/sys/compat/linux32/common/linux32_exec_elf32.c
/* $NetBSD: linux32_exec_elf32.c,v 1.8 2008/04/28 20:23:44 martin Exp $ */
/*-
* Copyright (c) 1995, 1998, 2000, 2001,2006 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, Eric Haszlakiewicz and
* Emmanuel Dreyfus.
*
* 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.
*
* 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: linux32_exec_elf32.c,v 1.8 2008/04/28 20:23:44 martin Exp $");
#define ELFSIZE 32
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/kauth.h>
#include <sys/kernel.h>
#include <sys/resourcevar.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <compat/linux/common/linux_exec.h>
#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_exec.h>
#include <compat/linux32/common/linux32_exec.h>
#include <machine/frame.h>
#ifdef DEBUG_LINUX
#define DPRINTF(a) uprintf a
#else
#define DPRINTF(a)
#endif
int linux32_copyinargs(struct exec_package *, struct ps_strings *,
void *, size_t, const void *, const void *);
int
ELFNAME2(linux32,probe)(l, epp, eh, itp, pos)
struct lwp *l;
struct exec_package *epp;
void *eh;
char *itp;
vaddr_t *pos;
{
int error;
if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) &&
#ifdef LINUX32_GCC_SIGNATURE
((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) &&
#endif
#ifdef LINUX32_ATEXIT_SIGNATURE
((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) &&
#endif
#ifdef LINUX32_DEBUGLINK_SIGNATURE
((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) &&
#endif
1)
return error;
if (itp) {
if ((error = emul_find_interp(l, epp, itp)))
return (error);
}
#if 0
DPRINTF(("linux32_probe: returning 0\n"));
#endif
epp->ep_flags |= EXEC_32;
epp->ep_vm_minaddr = VM_MIN_ADDRESS;
epp->ep_vm_maxaddr = USRSTACK32;
return 0;
}
/* round up and down to page boundaries. */
#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
#define ELF_TRUNC(a, b) ((a) & ~((b) - 1))
/*
* Copy arguments onto the stack in the normal way, but add some
* extra information in case of dynamic binding.
*/
int
linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack,
struct ps_strings *arginfo, char **stackp, void *argp)
{
struct linux32_extra_stack_data *esdp, esd;
struct elf_args *ap;
struct vattr *vap;
Elf_Ehdr *eh;
Elf_Phdr *ph;
Elf_Addr phdr = 0;
u_long phsize;
int error;
int i;
if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0)
return error;
/*
* Push extra arguments on the stack needed by dynamically
* linked binaries and static binaries as well.
*/
memset(&esd, 0, sizeof(esd));
esdp = (struct linux32_extra_stack_data *)(*stackp);
ap = (struct elf_args *)pack->ep_emul_arg;
vap = pack->ep_vap;
eh = (Elf_Ehdr *)pack->ep_hdr;
/*
* We forgot this, so we ned to reload it now. XXX keep track of it?
*/
if (ap == NULL) {
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize);
if (error != 0) {
for (i = 0; i < eh->e_phnum; i++) {
if (ph[i].p_type == PT_PHDR) {
phdr = ph[i].p_vaddr;
break;
}
}
}
free(ph, M_TEMP);
}
/*
* The exec_package doesn't have a proc pointer and it's not
* exactly trivial to add one since the credentials are
* changing. XXX Linux uses curlwp's credentials.
* Why can't we use them too? XXXad we do now; what's different
* about Linux's LWP creds?
*/
i = 0;
esd.ai[i].a_type = LINUX_AT_SYSINFO;
esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]);
esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR;
esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr);
esd.ai[i].a_type = LINUX_AT_HWCAP;
esd.ai[i++].a_v = LINUX32_CPUCAP;
esd.ai[i].a_type = AT_PAGESZ;
esd.ai[i++].a_v = PAGE_SIZE;
esd.ai[i].a_type = LINUX_AT_CLKTCK;
esd.ai[i++].a_v = hz;
esd.ai[i].a_type = AT_PHDR;
esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr);
esd.ai[i].a_type = AT_PHENT;
esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize);
esd.ai[i].a_type = AT_PHNUM;
esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum);
esd.ai[i].a_type = AT_BASE;
esd.ai[i++].a_v = (ap ? ap->arg_interp : 0);
esd.ai[i].a_type = AT_FLAGS;
esd.ai[i++].a_v = 0;
esd.ai[i].a_type = AT_ENTRY;
esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry);
esd.ai[i].a_type = LINUX_AT_EGID;
esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ?
vap->va_gid : kauth_cred_getegid(l->l_cred));
esd.ai[i].a_type = LINUX_AT_GID;
esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred);
esd.ai[i].a_type = LINUX_AT_EUID;
esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ?
vap->va_uid : kauth_cred_geteuid(l->l_cred));
esd.ai[i].a_type = LINUX_AT_UID;
esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred);
esd.ai[i].a_type = LINUX_AT_SECURE;
esd.ai[i++].a_v = 0;
esd.ai[i].a_type = LINUX_AT_PLATFORM;
esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]);
esd.ai[i].a_type = AT_NULL;
esd.ai[i++].a_v = 0;
#ifdef DEBUG_LINUX
if (i != LINUX32_ELF_AUX_ENTRIES) {
printf("linux32_elf32_copyargs: %d Aux entries\n", i);
return EINVAL;
}
#endif
memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall,
sizeof(linux32_kernel_vsyscall));
memcpy(&esd.elfhdr, eh, sizeof(*eh));
strcpy(esd.hw_platform, LINUX32_PLATFORM);
if (ap) {
free((char *)ap, M_TEMP);
pack->ep_emul_arg = NULL;
}
/*
* Copy out the ELF auxiliary table and hw platform name
*/
if ((error = copyout(&esd, esdp, sizeof(esd))) != 0)
return error;
*stackp += sizeof(esd);
return 0;
}