linux_exec_powerpc.c revision 1.23
1/* $NetBSD: linux_exec_powerpc.c,v 1.23 2012/02/03 20:11:53 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Emmanuel Dreyfus. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * From NetBSD's sys/compat/arch/alpha/linux_exec_alpha.c, with some 34 * powerpc add-ons (ifdef LINUX_SHIFT). 35 * 36 * This code is to be common to alpha and powerpc. If it works on alpha, it 37 * should be moved to common/linux_exec_elf32.c. Beware that it needs 38 * LINUX_ELF_AUX_ENTRIES in arch/<arch>/linux_exec.h to also be moved to common 39 * 40 * Emmanuel Dreyfus <p99dreyf@criens.u-psud.fr> 41 */ 42 43#include <sys/cdefs.h> 44__KERNEL_RCSID(0, "$NetBSD: linux_exec_powerpc.c,v 1.23 2012/02/03 20:11:53 matt Exp $"); 45 46#define ELFSIZE 32 47 48#include <sys/param.h> 49#include <sys/systm.h> 50#include <sys/kernel.h> 51#include <sys/proc.h> 52#include <sys/exec.h> 53#include <sys/exec_elf.h> 54#include <sys/resourcevar.h> 55#include <sys/kauth.h> 56 57#include <uvm/uvm_extern.h> 58 59#include <compat/linux/common/linux_exec.h> 60 61/* 62 * Alpha and PowerPC specific linux copyargs function. 63 */ 64int 65ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 66 struct lwp *l; 67 struct exec_package *pack; 68 struct ps_strings *arginfo; 69 char **stackp; 70 void *argp; 71{ 72 size_t len; 73 AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 74 struct elf_args *ap; 75 int error; 76 77#ifdef LINUX_SHIFT 78 /* 79 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 80 * aligned address. And we need one more 16 byte shift if it was already 81 * 16 bytes aligned, 82 */ 83 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 84#endif 85 86 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 87 return error; 88 89#ifdef LINUX_SHIFT 90 /* 91 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 92 * expects the ELF auxiliary table to start on a 16 bytes boundary on 93 * the PowerPC. 94 */ 95 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 96 & ~LINUX_SHIFT); 97#endif 98 99 memset(ai, 0, sizeof(AuxInfo) * LINUX_ELF_AUX_ENTRIES); 100 101 a = ai; 102 103 /* 104 * Push extra arguments on the stack needed by dynamically 105 * linked binaries. 106 */ 107 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 108#if 1 109 /* 110 * The exec_package doesn't have a proc pointer and it's not 111 * exactly trivial to add one since the credentials are 112 * changing. XXX Linux uses curlwp's credentials. 113 * Why can't we use them too? XXXad we do, what's different? 114 */ 115 a->a_type = LINUX_AT_EGID; 116 a->a_v = kauth_cred_getegid(l->l_cred); 117 a++; 118 119 a->a_type = LINUX_AT_GID; 120 a->a_v = kauth_cred_getgid(l->l_cred); 121 a++; 122 123 a->a_type = LINUX_AT_EUID; 124 a->a_v = kauth_cred_geteuid(l->l_cred); 125 a++; 126 127 a->a_type = LINUX_AT_UID; 128 a->a_v = kauth_cred_getuid(l->l_cred); 129 a++; 130#endif 131 132 a->a_type = AT_ENTRY; 133 a->a_v = ap->arg_entry; 134 a++; 135 136 a->a_type = AT_FLAGS; 137 a->a_v = 0; 138 a++; 139 140 a->a_type = AT_BASE; 141 a->a_v = ap->arg_interp; 142 a++; 143 144 a->a_type = AT_PHNUM; 145 a->a_v = ap->arg_phnum; 146 a++; 147 148 a->a_type = AT_PHENT; 149 a->a_v = ap->arg_phentsize; 150 a++; 151 152 a->a_type = AT_PHDR; 153 a->a_v = ap->arg_phaddr; 154 a++; 155 156 a->a_type = LINUX_AT_CLKTCK; 157 a->a_v = LINUX_CLOCKS_PER_SEC; 158 a++; 159 160 a->a_type = AT_PAGESZ; 161 a->a_v = PAGE_SIZE; 162 a++; 163 164 a->a_type = LINUX_AT_HWCAP; 165 a->a_v = LINUX_ELF_HWCAP; 166 a++; 167 168 exec_free_emul_arg(pack); 169 } 170 171 a->a_type = AT_NULL; 172 a->a_v = 0; 173 a++; 174 175 len = (a - ai) * sizeof(AuxInfo); 176 177 if ((error = copyout(ai, *stackp, len)) != 0) 178 return error; 179 *stackp += len; 180 return 0; 181} 182