linux_exec_powerpc.c revision 1.21
1/* $NetBSD: linux_exec_powerpc.c,v 1.21 2008/04/28 20:23:43 martin 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 1.21 2008/04/28 20:23:43 martin Exp $"); 45 46#if defined (__alpha__) 47#define ELFSIZE 64 48#elif defined (__powerpc__) 49#define ELFSIZE 32 50#else 51#error Unified linux_elf_{32|64}copyargs not tested for this platform 52#endif 53 54#include <sys/param.h> 55#include <sys/systm.h> 56#include <sys/kernel.h> 57#include <sys/malloc.h> 58#include <sys/proc.h> 59#include <sys/exec.h> 60#include <sys/exec_elf.h> 61#include <sys/resourcevar.h> 62#include <sys/kauth.h> 63 64#include <uvm/uvm_extern.h> 65 66#include <compat/linux/common/linux_exec.h> 67 68/* 69 * Alpha and PowerPC specific linux copyargs function. 70 */ 71int 72ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 73 struct lwp *l; 74 struct exec_package *pack; 75 struct ps_strings *arginfo; 76 char **stackp; 77 void *argp; 78{ 79 size_t len; 80 AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 81 struct elf_args *ap; 82 int error; 83 84#ifdef LINUX_SHIFT 85 /* 86 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 87 * aligned address. And we need one more 16 byte shift if it was already 88 * 16 bytes aligned, 89 */ 90 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 91#endif 92 93 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 94 return error; 95 96#ifdef LINUX_SHIFT 97 /* 98 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 99 * expects the ELF auxiliary table to start on a 16 bytes boundary on 100 * the PowerPC. 101 */ 102 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 103 & ~LINUX_SHIFT); 104#endif 105 106 memset(ai, 0, sizeof(AuxInfo) * LINUX_ELF_AUX_ENTRIES); 107 108 a = ai; 109 110 /* 111 * Push extra arguments on the stack needed by dynamically 112 * linked binaries. 113 */ 114 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 115#if 1 116 /* 117 * The exec_package doesn't have a proc pointer and it's not 118 * exactly trivial to add one since the credentials are 119 * changing. XXX Linux uses curlwp's credentials. 120 * Why can't we use them too? XXXad we do, what's different? 121 */ 122 a->a_type = LINUX_AT_EGID; 123 a->a_v = kauth_cred_getegid(l->l_cred); 124 a++; 125 126 a->a_type = LINUX_AT_GID; 127 a->a_v = kauth_cred_getgid(l->l_cred); 128 a++; 129 130 a->a_type = LINUX_AT_EUID; 131 a->a_v = kauth_cred_geteuid(l->l_cred); 132 a++; 133 134 a->a_type = LINUX_AT_UID; 135 a->a_v = kauth_cred_getuid(l->l_cred); 136 a++; 137#endif 138 139 a->a_type = AT_ENTRY; 140 a->a_v = ap->arg_entry; 141 a++; 142 143 a->a_type = AT_FLAGS; 144 a->a_v = 0; 145 a++; 146 147 a->a_type = AT_BASE; 148 a->a_v = ap->arg_interp; 149 a++; 150 151 a->a_type = AT_PHNUM; 152 a->a_v = ap->arg_phnum; 153 a++; 154 155 a->a_type = AT_PHENT; 156 a->a_v = ap->arg_phentsize; 157 a++; 158 159 a->a_type = AT_PHDR; 160 a->a_v = ap->arg_phaddr; 161 a++; 162 163 a->a_type = LINUX_AT_CLKTCK; 164 a->a_v = LINUX_CLOCKS_PER_SEC; 165 a++; 166 167 a->a_type = AT_PAGESZ; 168 a->a_v = PAGE_SIZE; 169 a++; 170 171 a->a_type = LINUX_AT_HWCAP; 172 a->a_v = LINUX_ELF_HWCAP; 173 a++; 174 175 free((char *)ap, M_TEMP); 176 pack->ep_emul_arg = NULL; 177 } 178 179 a->a_type = AT_NULL; 180 a->a_v = 0; 181 a++; 182 183 len = (a - ai) * sizeof(AuxInfo); 184 185 if ((error = copyout(ai, *stackp, len)) != 0) 186 return error; 187 *stackp += len; 188 return 0; 189} 190