linux_exec_powerpc.c revision 1.20
1/* $NetBSD: linux_exec_powerpc.c,v 1.20 2006/07/23 22:06:09 ad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39/* 40 * From NetBSD's sys/compat/arch/alpha/linux_exec_alpha.c, with some 41 * powerpc add-ons (ifdef LINUX_SHIFT). 42 * 43 * This code is to be common to alpha and powerpc. If it works on alpha, it 44 * should be moved to common/linux_exec_elf32.c. Beware that it needs 45 * LINUX_ELF_AUX_ENTRIES in arch/<arch>/linux_exec.h to also be moved to common 46 * 47 * Emmanuel Dreyfus <p99dreyf@criens.u-psud.fr> 48 */ 49 50#include <sys/cdefs.h> 51__KERNEL_RCSID(0, "$NetBSD: linux_exec_powerpc.c,v 1.20 2006/07/23 22:06:09 ad Exp $"); 52 53#if defined (__alpha__) 54#define ELFSIZE 64 55#elif defined (__powerpc__) 56#define ELFSIZE 32 57#else 58#error Unified linux_elf_{32|64}copyargs not tested for this platform 59#endif 60 61#include <sys/param.h> 62#include <sys/systm.h> 63#include <sys/kernel.h> 64#include <sys/malloc.h> 65#include <sys/proc.h> 66#include <sys/exec.h> 67#include <sys/exec_elf.h> 68#include <sys/resourcevar.h> 69#include <sys/kauth.h> 70 71#include <uvm/uvm_extern.h> 72 73#include <compat/linux/common/linux_exec.h> 74 75/* 76 * Alpha and PowerPC specific linux copyargs function. 77 */ 78int 79ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 80 struct lwp *l; 81 struct exec_package *pack; 82 struct ps_strings *arginfo; 83 char **stackp; 84 void *argp; 85{ 86 size_t len; 87 AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 88 struct elf_args *ap; 89 int error; 90 91#ifdef LINUX_SHIFT 92 /* 93 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 94 * aligned address. And we need one more 16 byte shift if it was already 95 * 16 bytes aligned, 96 */ 97 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 98#endif 99 100 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 101 return error; 102 103#ifdef LINUX_SHIFT 104 /* 105 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 106 * expects the ELF auxiliary table to start on a 16 bytes boundary on 107 * the PowerPC. 108 */ 109 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 110 & ~LINUX_SHIFT); 111#endif 112 113 memset(ai, 0, sizeof(AuxInfo) * LINUX_ELF_AUX_ENTRIES); 114 115 a = ai; 116 117 /* 118 * Push extra arguments on the stack needed by dynamically 119 * linked binaries. 120 */ 121 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 122#if 1 123 /* 124 * The exec_package doesn't have a proc pointer and it's not 125 * exactly trivial to add one since the credentials are 126 * changing. XXX Linux uses curlwp's credentials. 127 * Why can't we use them too? XXXad we do, what's different? 128 */ 129 a->a_type = LINUX_AT_EGID; 130 a->a_v = kauth_cred_getegid(l->l_cred); 131 a++; 132 133 a->a_type = LINUX_AT_GID; 134 a->a_v = kauth_cred_getgid(l->l_cred); 135 a++; 136 137 a->a_type = LINUX_AT_EUID; 138 a->a_v = kauth_cred_geteuid(l->l_cred); 139 a++; 140 141 a->a_type = LINUX_AT_UID; 142 a->a_v = kauth_cred_getuid(l->l_cred); 143 a++; 144#endif 145 146 a->a_type = AT_ENTRY; 147 a->a_v = ap->arg_entry; 148 a++; 149 150 a->a_type = AT_FLAGS; 151 a->a_v = 0; 152 a++; 153 154 a->a_type = AT_BASE; 155 a->a_v = ap->arg_interp; 156 a++; 157 158 a->a_type = AT_PHNUM; 159 a->a_v = ap->arg_phnum; 160 a++; 161 162 a->a_type = AT_PHENT; 163 a->a_v = ap->arg_phentsize; 164 a++; 165 166 a->a_type = AT_PHDR; 167 a->a_v = ap->arg_phaddr; 168 a++; 169 170 a->a_type = LINUX_AT_CLKTCK; 171 a->a_v = LINUX_CLOCKS_PER_SEC; 172 a++; 173 174 a->a_type = AT_PAGESZ; 175 a->a_v = PAGE_SIZE; 176 a++; 177 178 a->a_type = LINUX_AT_HWCAP; 179 a->a_v = LINUX_ELF_HWCAP; 180 a++; 181 182 free((char *)ap, M_TEMP); 183 pack->ep_emul_arg = NULL; 184 } 185 186 a->a_type = AT_NULL; 187 a->a_v = 0; 188 a++; 189 190 len = (a - ai) * sizeof(AuxInfo); 191 192 if ((error = copyout(ai, *stackp, len)) != 0) 193 return error; 194 *stackp += len; 195 return 0; 196} 197