/* $NetBSD: linux_exec_powerpc.c,v 1.24.44.1 2022/08/03 11:11:32 martin Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by 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. */ /* * From NetBSD's sys/compat/arch/alpha/linux_exec_alpha.c, with some * powerpc add-ons (ifdef LINUX_SHIFT). * * This code is to be common to alpha and powerpc. If it works on alpha, it * should be moved to common/linux_exec_elf32.c. Beware that it needs * LINUX_ELF_AUX_ENTRIES in arch//linux_exec.h to also be moved to common * * Emmanuel Dreyfus */ #include __KERNEL_RCSID(0, "$NetBSD: linux_exec_powerpc.c,v 1.24.44.1 2022/08/03 11:11:32 martin Exp $"); #define ELFSIZE 32 #include #include #include #include #include #include #include #include #include #include /* * Alpha and PowerPC specific linux copyargs function. */ int ELFNAME2(linux,copyargs)(struct lwp *l, struct exec_package *pack, struct ps_strings *arginfo, char **stackp, void *argp) { size_t len; AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; struct elf_args *ap; int error; #ifdef LINUX_SHIFT /* * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes * aligned address. And we need one more 16 byte shift if it was already * 16 bytes aligned, */ *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); #endif if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) return error; #ifdef LINUX_SHIFT /* * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so * expects the ELF auxiliary table to start on a 16 bytes boundary on * the PowerPC. */ *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) & ~LINUX_SHIFT); #endif memset(ai, 0, sizeof(ai)); a = ai; /* * Push extra arguments on the stack needed by dynamically * linked binaries. */ if ((ap = (struct elf_args *)pack->ep_emul_arg)) { #if 1 /* * 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, what's different? */ a->a_type = LINUX_AT_EGID; a->a_v = kauth_cred_getegid(l->l_cred); a++; a->a_type = LINUX_AT_GID; a->a_v = kauth_cred_getgid(l->l_cred); a++; a->a_type = LINUX_AT_EUID; a->a_v = kauth_cred_geteuid(l->l_cred); a++; a->a_type = LINUX_AT_UID; a->a_v = kauth_cred_getuid(l->l_cred); a++; #endif a->a_type = AT_ENTRY; a->a_v = ap->arg_entry; a++; a->a_type = AT_FLAGS; a->a_v = 0; a++; a->a_type = AT_BASE; a->a_v = ap->arg_interp; a++; a->a_type = AT_PHNUM; a->a_v = ap->arg_phnum; a++; a->a_type = AT_PHENT; a->a_v = ap->arg_phentsize; a++; a->a_type = AT_PHDR; a->a_v = ap->arg_phaddr; a++; a->a_type = LINUX_AT_CLKTCK; a->a_v = LINUX_CLOCKS_PER_SEC; a++; a->a_type = AT_PAGESZ; a->a_v = PAGE_SIZE; a++; a->a_type = LINUX_AT_HWCAP; a->a_v = LINUX_ELF_HWCAP; a++; exec_free_emul_arg(pack); } a->a_type = AT_NULL; a->a_v = 0; a++; len = (a - ai) * sizeof(AuxInfo); if ((error = copyout(ai, *stackp, len)) != 0) return error; *stackp += len; return 0; }