227 lines
6.1 KiB
C
227 lines
6.1 KiB
C
/* $NetBSD: linux_exec_powerpc.c,v 1.5 2001/08/08 13:23:34 christos Exp $ */
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/*-
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* Copyright (c) 2001 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 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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/*
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* From NetBSD's sys/compat/arch/alpha/linux_exec_alpha.c, with some
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* powerpc add-ons (ifdef LINUX_SHIFT and LINUX_SP_WRAP).
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*
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* This code is to be common to alpha and powerpc. If it works on alpha, it
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* should be moved to common/linux_exec_elf32.c. Beware that it needs
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* LINUX_ELF_AUX_ENTRIES in arch/<arch>/linux_exec.h to also be moved to common
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*
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* Emmanuel Dreyfus <p99dreyf@criens.u-psud.fr>
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*/
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#if defined (__alpha__)
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#define ELFSIZE 64
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#elif defined (__powerpc__)
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#define ELFSIZE 32
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#else
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#error Unified linux_elf_{32|64}copyargs not tested for this platform
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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/malloc.h>
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#include <sys/proc.h>
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <compat/linux/common/linux_exec.h>
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#ifdef LINUX_SP_WRAP
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extern int linux_sp_wrap_start;
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extern int linux_sp_wrap_end;
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extern int linux_sp_wrap_entry;
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#endif
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/*
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* Alpha and PowerPC specific linux copyargs function.
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*/
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int
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ELFNAME2(linux,copyargs)(pack, arginfo, stackp, argp)
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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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size_t len;
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LinuxAuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a;
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struct elf_args *ap;
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struct proc *p = curproc;
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#ifdef LINUX_SP_WRAP
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LinuxAuxInfo *prog_entry = NULL;
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char linux_sp_wrap_code[LINUX_SP_WRAP];
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unsigned long* cga;
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#endif
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int error;
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#ifdef LINUX_SHIFT
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/*
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* Seems that PowerPC Linux binaries expect argc to start on a 16 bytes
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* aligned address. And we need one more 16 byte shift if it was already
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* 16 bytes aligned,
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*/
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*stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT);
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#endif
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if ((error = copyargs(pack, arginfo, stackp, argp)) != 0)
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return error;
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#ifdef LINUX_SHIFT
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/*
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* From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so
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* expects the ELF auxiliary table to start on a 16 bytes boundary on
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* the PowerPC.
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*/
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*stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT)
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& ~LINUX_SHIFT);
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#endif
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memset(ai, 0, sizeof(LinuxAuxInfo) * LINUX_ELF_AUX_ENTRIES);
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a = ai;
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/*
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* Push extra arguments on the stack needed by dynamically
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* linked binaries.
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*/
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if ((ap = (struct elf_args *)pack->ep_emul_arg)) {
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#ifdef LINUX_SP_WRAP
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memset(linux_sp_wrap_code, 0, LINUX_SP_WRAP);
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bcopy(&linux_sp_wrap_start, linux_sp_wrap_code,
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(unsigned long)(&linux_sp_wrap_end)
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- (unsigned long)(&linux_sp_wrap_start));
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(unsigned long)cga = ((unsigned long)linux_sp_wrap_code)
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+ ((unsigned long)(&linux_sp_wrap_entry))
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- ((unsigned long)(&linux_sp_wrap_start));
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(*cga) = (unsigned long)(ap->arg_entry);
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#endif
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#if 1
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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 curproc's credentials.
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* Why can't we use them too?
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*/
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a->a_type = LINUX_AT_EGID;
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a->a_v = p->p_ucred->cr_gid;
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a++;
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a->a_type = LINUX_AT_GID;
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a->a_v = p->p_cred->p_rgid;
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a++;
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a->a_type = LINUX_AT_EUID;
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a->a_v = p->p_ucred->cr_uid;
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a++;
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a->a_type = LINUX_AT_UID;
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a->a_v = p->p_cred->p_ruid;
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a++;
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#endif
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a->a_type = AT_ENTRY;
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a->a_v = ap->arg_entry;
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#ifdef LINUX_SP_WRAP
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prog_entry = a;
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#endif
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a++;
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a->a_type = AT_FLAGS;
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a->a_v = 0;
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a++;
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a->a_type = AT_BASE;
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a->a_v = ap->arg_interp;
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a++;
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a->a_type = AT_PHNUM;
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a->a_v = ap->arg_phnum;
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a++;
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a->a_type = AT_PHENT;
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a->a_v = ap->arg_phentsize;
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a++;
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a->a_type = AT_PHDR;
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a->a_v = ap->arg_phaddr;
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a++;
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a->a_type = LINUX_AT_CLKTCK;
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a->a_v = LINUX_CLOCKS_PER_SEC;
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a++;
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a->a_type = AT_PAGESZ;
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a->a_v = NBPG;
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a++;
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a->a_type = LINUX_AT_HWCAP;
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a->a_v = LINUX_ELF_HWCAP;
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a++;
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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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a->a_type = AT_NULL;
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a->a_v = 0;
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a++;
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len = (a - ai) * sizeof(LinuxAuxInfo);
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#ifdef LINUX_SP_WRAP
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if (prog_entry != NULL)
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prog_entry->a_v = (unsigned long)(*stackp) + len;
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#endif
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if ((error = copyout(ai, *stackp, len)) != 0)
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return error;
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*stackp += len;
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#ifdef LINUX_SP_WRAP
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if (prog_entry != NULL) {
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if ((error = copyout(linux_sp_wrap_code, *stackp,
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LINUX_SP_WRAP)) != 0)
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return error;
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*stackp += LINUX_SP_WRAP;
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}
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#endif
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return 0;
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}
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