linux_exec_powerpc.c revision 1.5
1/* $NetBSD: linux_exec_powerpc.c,v 1.5 2001/08/08 13:23:34 christos 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 and LINUX_SP_WRAP). 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#if defined (__alpha__) 50#define ELFSIZE 64 51#elif defined (__powerpc__) 52#define ELFSIZE 32 53#else 54#error Unified linux_elf_{32|64}copyargs not tested for this platform 55#endif 56 57#include <sys/param.h> 58#include <sys/systm.h> 59#include <sys/kernel.h> 60#include <sys/malloc.h> 61#include <sys/proc.h> 62#include <sys/exec.h> 63#include <sys/exec_elf.h> 64 65#include <compat/linux/common/linux_exec.h> 66 67#ifdef LINUX_SP_WRAP 68extern int linux_sp_wrap_start; 69extern int linux_sp_wrap_end; 70extern int linux_sp_wrap_entry; 71#endif 72/* 73 * Alpha and PowerPC specific linux copyargs function. 74 */ 75int 76ELFNAME2(linux,copyargs)(pack, arginfo, stackp, argp) 77 struct exec_package *pack; 78 struct ps_strings *arginfo; 79 char **stackp; 80 void *argp; 81{ 82 size_t len; 83 LinuxAuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 84 struct elf_args *ap; 85 struct proc *p = curproc; 86#ifdef LINUX_SP_WRAP 87 LinuxAuxInfo *prog_entry = NULL; 88 char linux_sp_wrap_code[LINUX_SP_WRAP]; 89 unsigned long* cga; 90#endif 91 int error; 92 93#ifdef LINUX_SHIFT 94 /* 95 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 96 * aligned address. And we need one more 16 byte shift if it was already 97 * 16 bytes aligned, 98 */ 99 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 100#endif 101 102 if ((error = copyargs(pack, arginfo, stackp, argp)) != 0) 103 return error; 104 105#ifdef LINUX_SHIFT 106 /* 107 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 108 * expects the ELF auxiliary table to start on a 16 bytes boundary on 109 * the PowerPC. 110 */ 111 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 112 & ~LINUX_SHIFT); 113#endif 114 115 memset(ai, 0, sizeof(LinuxAuxInfo) * LINUX_ELF_AUX_ENTRIES); 116 117 a = ai; 118 119 /* 120 * Push extra arguments on the stack needed by dynamically 121 * linked binaries. 122 */ 123 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 124#ifdef LINUX_SP_WRAP 125 memset(linux_sp_wrap_code, 0, LINUX_SP_WRAP); 126 bcopy(&linux_sp_wrap_start, linux_sp_wrap_code, 127 (unsigned long)(&linux_sp_wrap_end) 128 - (unsigned long)(&linux_sp_wrap_start)); 129 (unsigned long)cga = ((unsigned long)linux_sp_wrap_code) 130 + ((unsigned long)(&linux_sp_wrap_entry)) 131 - ((unsigned long)(&linux_sp_wrap_start)); 132 (*cga) = (unsigned long)(ap->arg_entry); 133#endif 134#if 1 135 /* 136 * The exec_package doesn't have a proc pointer and it's not 137 * exactly trivial to add one since the credentials are 138 * changing. XXX Linux uses curproc's credentials. 139 * Why can't we use them too? 140 */ 141 a->a_type = LINUX_AT_EGID; 142 a->a_v = p->p_ucred->cr_gid; 143 a++; 144 145 a->a_type = LINUX_AT_GID; 146 a->a_v = p->p_cred->p_rgid; 147 a++; 148 149 a->a_type = LINUX_AT_EUID; 150 a->a_v = p->p_ucred->cr_uid; 151 a++; 152 153 a->a_type = LINUX_AT_UID; 154 a->a_v = p->p_cred->p_ruid; 155 a++; 156#endif 157 158 a->a_type = AT_ENTRY; 159 a->a_v = ap->arg_entry; 160#ifdef LINUX_SP_WRAP 161 prog_entry = a; 162#endif 163 a++; 164 165 a->a_type = AT_FLAGS; 166 a->a_v = 0; 167 a++; 168 169 a->a_type = AT_BASE; 170 a->a_v = ap->arg_interp; 171 a++; 172 173 a->a_type = AT_PHNUM; 174 a->a_v = ap->arg_phnum; 175 a++; 176 177 a->a_type = AT_PHENT; 178 a->a_v = ap->arg_phentsize; 179 a++; 180 181 a->a_type = AT_PHDR; 182 a->a_v = ap->arg_phaddr; 183 a++; 184 185 a->a_type = LINUX_AT_CLKTCK; 186 a->a_v = LINUX_CLOCKS_PER_SEC; 187 a++; 188 189 a->a_type = AT_PAGESZ; 190 a->a_v = NBPG; 191 a++; 192 193 a->a_type = LINUX_AT_HWCAP; 194 a->a_v = LINUX_ELF_HWCAP; 195 a++; 196 197 free((char *)ap, M_TEMP); 198 pack->ep_emul_arg = NULL; 199 } 200 201 a->a_type = AT_NULL; 202 a->a_v = 0; 203 a++; 204 205 len = (a - ai) * sizeof(LinuxAuxInfo); 206 207#ifdef LINUX_SP_WRAP 208 if (prog_entry != NULL) 209 prog_entry->a_v = (unsigned long)(*stackp) + len; 210#endif 211 212 if ((error = copyout(ai, *stackp, len)) != 0) 213 return error; 214 *stackp += len; 215 216#ifdef LINUX_SP_WRAP 217 if (prog_entry != NULL) { 218 if ((error = copyout(linux_sp_wrap_code, *stackp, 219 LINUX_SP_WRAP)) != 0) 220 return error; 221 *stackp += LINUX_SP_WRAP; 222 } 223#endif 224 225 return 0; 226} 227