FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/elf_common.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2019 Justin Hibbits
      *
      * 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
     *    in this position and unchanged.
     * 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. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    static int
    __elfN(powerpc_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
    {
            Elf_Auxargs *args;
            Elf_Auxinfo *argarray, *pos;
            int error;
    
            /*
             * XXX If we can't find image's OSREL, assume it uses the new auxv
             * format.
             *
             * This is specially important for rtld, that is not tagged. Using
             * direct exec mode with new (ELFv2) binaries that expect the new auxv
             * format would result in crashes otherwise.
             *
             * Unfortunately, this may break direct exec'ing old binaries,
             * but it seems better to correctly support new binaries by default,
             * considering the transition to ELFv2 happened quite some time
             * ago. If needed, a sysctl may be added to allow old auxv format to
             * be used when OSREL is not found.
             */
            if (imgp->proc->p_osrel >= P_OSREL_POWERPC_NEW_AUX_ARGS ||
                imgp->proc->p_osrel == 0)
                    return (__elfN(freebsd_copyout_auxargs)(imgp, base));
    
            args = (Elf_Auxargs *)imgp->auxargs;
            argarray = pos = malloc(AT_OLD_COUNT * sizeof(*pos), M_TEMP,
                M_WAITOK | M_ZERO);
    
            if (args->execfd != -1)
                    AUXARGS_ENTRY(pos, AT_OLD_EXECFD, args->execfd);
            AUXARGS_ENTRY(pos, AT_OLD_PHDR, args->phdr);
            AUXARGS_ENTRY(pos, AT_OLD_PHENT, args->phent);
            AUXARGS_ENTRY(pos, AT_OLD_PHNUM, args->phnum);
            AUXARGS_ENTRY(pos, AT_OLD_PAGESZ, args->pagesz);
            AUXARGS_ENTRY(pos, AT_OLD_FLAGS, args->flags);
            AUXARGS_ENTRY(pos, AT_OLD_ENTRY, args->entry);
            AUXARGS_ENTRY(pos, AT_OLD_BASE, args->base);
            AUXARGS_ENTRY(pos, AT_OLD_EHDRFLAGS, args->hdr_eflags);
            if (imgp->execpathp != 0)
                    AUXARGS_ENTRY_PTR(pos, AT_OLD_EXECPATH, imgp->execpathp);
            AUXARGS_ENTRY(pos, AT_OLD_OSRELDATE,
                imgp->proc->p_ucred->cr_prison->pr_osreldate);
            if (imgp->canary != 0) {
                    AUXARGS_ENTRY_PTR(pos, AT_OLD_CANARY, imgp->canary);
                    AUXARGS_ENTRY(pos, AT_OLD_CANARYLEN, imgp->canarylen);
            }
            AUXARGS_ENTRY(pos, AT_OLD_NCPUS, mp_ncpus);
            if (imgp->pagesizes != 0) {
                    AUXARGS_ENTRY_PTR(pos, AT_OLD_PAGESIZES, imgp->pagesizes);
                    AUXARGS_ENTRY(pos, AT_OLD_PAGESIZESLEN, imgp->pagesizeslen);
            }
            if (imgp->sysent->sv_timekeep_base != 0) {
                    AUXARGS_ENTRY(pos, AT_OLD_TIMEKEEP,
                        imgp->sysent->sv_timekeep_base);
            }
            AUXARGS_ENTRY(pos, AT_OLD_STACKPROT, imgp->sysent->sv_shared_page_obj
                != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
                imgp->sysent->sv_stackprot);
            if (imgp->sysent->sv_hwcap != NULL)
                    AUXARGS_ENTRY(pos, AT_OLD_HWCAP, *imgp->sysent->sv_hwcap);
            if (imgp->sysent->sv_hwcap2 != NULL)
                    AUXARGS_ENTRY(pos, AT_OLD_HWCAP2, *imgp->sysent->sv_hwcap2);
            AUXARGS_ENTRY(pos, AT_OLD_NULL, 0);
    
            free(imgp->auxargs, M_TEMP);
            imgp->auxargs = NULL;
            KASSERT(pos - argarray <= AT_OLD_COUNT, ("Too many auxargs"));
   
           error = copyout(argarray, (void *)base, sizeof(*argarray) * AT_OLD_COUNT);
           free(argarray, M_TEMP);
           return (error);
   }

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