linux_exec_powerpc.c revision 1.15
1/* $NetBSD: linux_exec_powerpc.c,v 1.15 2004/07/25 23:26:44 chs 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 1.15 2004/07/25 23:26:44 chs 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 70#include <uvm/uvm_extern.h> 71 72#include <compat/linux/common/linux_exec.h> 73 74/* 75 * Alpha and PowerPC specific linux copyargs function. 76 */ 77int 78ELFNAME2(linux,copyargs)(p, pack, arginfo, stackp, argp) 79 struct proc *p; 80 struct exec_package *pack; 81 struct ps_strings *arginfo; 82 char **stackp; 83 void *argp; 84{ 85 size_t len; 86 AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 87 struct elf_args *ap; 88 int error; 89 90#ifdef LINUX_SHIFT 91 /* 92 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 93 * aligned address. And we need one more 16 byte shift if it was already 94 * 16 bytes aligned, 95 */ 96 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 97#endif 98 99 if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) 100 return error; 101 102#ifdef LINUX_SHIFT 103 /* 104 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 105 * expects the ELF auxiliary table to start on a 16 bytes boundary on 106 * the PowerPC. 107 */ 108 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 109 & ~LINUX_SHIFT); 110#endif 111 112 memset(ai, 0, sizeof(AuxInfo) * LINUX_ELF_AUX_ENTRIES); 113 114 a = ai; 115 116 /* 117 * Push extra arguments on the stack needed by dynamically 118 * linked binaries. 119 */ 120 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 121#if 1 122 /* 123 * The exec_package doesn't have a proc pointer and it's not 124 * exactly trivial to add one since the credentials are 125 * changing. XXX Linux uses curlwp's credentials. 126 * Why can't we use them too? 127 */ 128 a->a_type = LINUX_AT_EGID; 129 a->a_v = p->p_ucred->cr_gid; 130 a++; 131 132 a->a_type = LINUX_AT_GID; 133 a->a_v = p->p_cred->p_rgid; 134 a++; 135 136 a->a_type = LINUX_AT_EUID; 137 a->a_v = p->p_ucred->cr_uid; 138 a++; 139 140 a->a_type = LINUX_AT_UID; 141 a->a_v = p->p_cred->p_ruid; 142 a++; 143#endif 144 145 a->a_type = AT_ENTRY; 146 a->a_v = ap->arg_entry; 147 a++; 148 149 a->a_type = AT_FLAGS; 150 a->a_v = 0; 151 a++; 152 153 a->a_type = AT_BASE; 154 a->a_v = ap->arg_interp; 155 a++; 156 157 a->a_type = AT_PHNUM; 158 a->a_v = ap->arg_phnum; 159 a++; 160 161 a->a_type = AT_PHENT; 162 a->a_v = ap->arg_phentsize; 163 a++; 164 165 a->a_type = AT_PHDR; 166 a->a_v = ap->arg_phaddr; 167 a++; 168 169 a->a_type = LINUX_AT_CLKTCK; 170 a->a_v = LINUX_CLOCKS_PER_SEC; 171 a++; 172 173 a->a_type = AT_PAGESZ; 174 a->a_v = PAGE_SIZE; 175 a++; 176 177 a->a_type = LINUX_AT_HWCAP; 178 a->a_v = LINUX_ELF_HWCAP; 179 a++; 180 181 free((char *)ap, M_TEMP); 182 pack->ep_emul_arg = NULL; 183 } 184 185 a->a_type = AT_NULL; 186 a->a_v = 0; 187 a++; 188 189 len = (a - ai) * sizeof(AuxInfo); 190 191 if ((error = copyout(ai, *stackp, len)) != 0) 192 return error; 193 *stackp += len; 194 return 0; 195} 196