252 lines
7.2 KiB
C
252 lines
7.2 KiB
C
/* $NetBSD: linux_exec_machdep.c,v 1.10 2007/10/19 12:16:37 ad Exp $ */
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/*-
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* Copyright (c) 2005 Emmanuel Dreyfus, 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 Emmanuel Dreyfus
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* 4. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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: linux_exec_machdep.c,v 1.10 2007/10/19 12:16:37 ad Exp $");
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#ifdef __amd64__
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#define ELFSIZE 64
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/resource.h>
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#include <sys/proc.h>
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#include <sys/conf.h>
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#include <sys/malloc.h>
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#include <sys/exec_elf.h>
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#include <sys/vnode.h>
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#include <sys/lwp.h>
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#include <sys/exec.h>
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#include <sys/stat.h>
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#include <sys/kauth.h>
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#include <sys/cpu.h>
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#include <machine/vmparam.h>
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#include <uvm/uvm.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_ioctl.h>
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#include <compat/linux/common/linux_hdio.h>
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#include <compat/linux/common/linux_exec.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/common/linux_errno.h>
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int
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linux_exec_setup_stack(struct lwp *l, struct exec_package *epp)
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{
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u_long max_stack_size;
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u_long access_linear_min, access_size;
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u_long noaccess_linear_min, noaccess_size;
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#ifndef USRSTACK32
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#define USRSTACK32 (0x00000000ffffffffL & ~PGOFSET)
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#endif
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if (epp->ep_flags & EXEC_32) {
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epp->ep_minsaddr = USRSTACK32;
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max_stack_size = MAXSSIZ;
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if (epp->ep_minsaddr > LINUX_USRSTACK32)
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epp->ep_minsaddr = LINUX_USRSTACK32;
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} else {
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epp->ep_minsaddr = USRSTACK;
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max_stack_size = MAXSSIZ;
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if (epp->ep_minsaddr > LINUX_USRSTACK)
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epp->ep_minsaddr = LINUX_USRSTACK;
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}
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epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr,
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max_stack_size);
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epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;
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/*
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* set up commands for stack. note that this takes *two*, one to
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* map the part of the stack which we can access, and one to map
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* the part which we can't.
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*
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* arguably, it could be made into one, but that would require the
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* addition of another mapping proc, which is unnecessary
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*/
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access_size = epp->ep_ssize;
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access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size);
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noaccess_size = max_stack_size - access_size;
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noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
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access_size), noaccess_size);
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if (noaccess_size > 0) {
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
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noaccess_linear_min, NULLVP, 0, VM_PROT_NONE);
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}
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KASSERT(access_size > 0);
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size,
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access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE);
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return 0;
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}
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int
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ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp)
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struct lwp *l;
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struct exec_package *pack;
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struct ps_strings *arginfo;
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char **stackp;
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void *argp;
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{
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struct linux_extra_stack_data64 *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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u_long phsize;
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Elf_Addr phdr = 0;
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int error;
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int i;
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if ((error = 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 linux_extra_stack_data64 *)(*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?
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*/
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i = 0;
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esd.ai[i].a_type = LINUX_AT_HWCAP;
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esd.ai[i++].a_v = rcr4();
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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 = (Elf_Addr)&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 != LINUX_ELF_AUX_ENTRIES) {
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printf("linux_elf64_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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strcpy(esd.hw_platform, LINUX_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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