1 /* $NetBSD: linux_exec_powerpc.c,v 1.10 2003/04/01 14:45:09 thorpej 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 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: linux_exec_powerpc.c,v 1.10 2003/04/01 14:45:09 thorpej 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 69 #include <uvm/uvm_extern.h> 70 71 #include <compat/linux/common/linux_exec.h> 72 73 #ifdef LINUX_SP_WRAP 74 extern int linux_sp_wrap_start; 75 extern int linux_sp_wrap_end; 76 extern int linux_sp_wrap_entry; 77 #endif 78 /* 79 * Alpha and PowerPC specific linux copyargs function. 80 */ 81 int 82 ELFNAME2(linux,copyargs)(p, pack, arginfo, stackp, argp) 83 struct proc *p; 84 struct exec_package *pack; 85 struct ps_strings *arginfo; 86 char **stackp; 87 void *argp; 88 { 89 size_t len; 90 AuxInfo ai[LINUX_ELF_AUX_ENTRIES], *a; 91 struct elf_args *ap; 92 #ifdef LINUX_SP_WRAP 93 AuxInfo *prog_entry = NULL; 94 char linux_sp_wrap_code[LINUX_SP_WRAP]; 95 unsigned long* cga; 96 #endif 97 int error; 98 99 #ifdef LINUX_SHIFT 100 /* 101 * Seems that PowerPC Linux binaries expect argc to start on a 16 bytes 102 * aligned address. And we need one more 16 byte shift if it was already 103 * 16 bytes aligned, 104 */ 105 *stackp = (char *)(((unsigned long)*stackp - 1) & ~LINUX_SHIFT); 106 #endif 107 108 if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) 109 return error; 110 111 #ifdef LINUX_SHIFT 112 /* 113 * From Linux's arch/ppc/kernel/process.c:shove_aux_table(). GNU ld.so 114 * expects the ELF auxiliary table to start on a 16 bytes boundary on 115 * the PowerPC. 116 */ 117 *stackp = (char *)(((unsigned long)(*stackp) + LINUX_SHIFT) 118 & ~LINUX_SHIFT); 119 #endif 120 121 memset(ai, 0, sizeof(AuxInfo) * LINUX_ELF_AUX_ENTRIES); 122 123 a = ai; 124 125 /* 126 * Push extra arguments on the stack needed by dynamically 127 * linked binaries. 128 */ 129 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 130 #ifdef LINUX_SP_WRAP 131 memset(linux_sp_wrap_code, 0, LINUX_SP_WRAP); 132 bcopy(&linux_sp_wrap_start, linux_sp_wrap_code, 133 (unsigned long)(&linux_sp_wrap_end) 134 - (unsigned long)(&linux_sp_wrap_start)); 135 (unsigned long)cga = ((unsigned long)linux_sp_wrap_code) 136 + ((unsigned long)(&linux_sp_wrap_entry)) 137 - ((unsigned long)(&linux_sp_wrap_start)); 138 (*cga) = (unsigned long)(ap->arg_entry); 139 #endif 140 #if 1 141 /* 142 * The exec_package doesn't have a proc pointer and it's not 143 * exactly trivial to add one since the credentials are 144 * changing. XXX Linux uses curlwp's credentials. 145 * Why can't we use them too? 146 */ 147 a->a_type = LINUX_AT_EGID; 148 a->a_v = p->p_ucred->cr_gid; 149 a++; 150 151 a->a_type = LINUX_AT_GID; 152 a->a_v = p->p_cred->p_rgid; 153 a++; 154 155 a->a_type = LINUX_AT_EUID; 156 a->a_v = p->p_ucred->cr_uid; 157 a++; 158 159 a->a_type = LINUX_AT_UID; 160 a->a_v = p->p_cred->p_ruid; 161 a++; 162 #endif 163 164 a->a_type = AT_ENTRY; 165 a->a_v = ap->arg_entry; 166 #ifdef LINUX_SP_WRAP 167 prog_entry = a; 168 #endif 169 a++; 170 171 a->a_type = AT_FLAGS; 172 a->a_v = 0; 173 a++; 174 175 a->a_type = AT_BASE; 176 a->a_v = ap->arg_interp; 177 a++; 178 179 a->a_type = AT_PHNUM; 180 a->a_v = ap->arg_phnum; 181 a++; 182 183 a->a_type = AT_PHENT; 184 a->a_v = ap->arg_phentsize; 185 a++; 186 187 a->a_type = AT_PHDR; 188 a->a_v = ap->arg_phaddr; 189 a++; 190 191 a->a_type = LINUX_AT_CLKTCK; 192 a->a_v = LINUX_CLOCKS_PER_SEC; 193 a++; 194 195 a->a_type = AT_PAGESZ; 196 a->a_v = PAGE_SIZE; 197 a++; 198 199 a->a_type = LINUX_AT_HWCAP; 200 a->a_v = LINUX_ELF_HWCAP; 201 a++; 202 203 free((char *)ap, M_TEMP); 204 pack->ep_emul_arg = NULL; 205 } 206 207 a->a_type = AT_NULL; 208 a->a_v = 0; 209 a++; 210 211 len = (a - ai) * sizeof(AuxInfo); 212 213 #ifdef LINUX_SP_WRAP 214 if (prog_entry != NULL) 215 prog_entry->a_v = (unsigned long)(*stackp) + len; 216 #endif 217 218 if ((error = copyout(ai, *stackp, len)) != 0) 219 return error; 220 *stackp += len; 221 222 #ifdef LINUX_SP_WRAP 223 if (prog_entry != NULL) { 224 if ((error = copyout(linux_sp_wrap_code, *stackp, 225 LINUX_SP_WRAP)) != 0) 226 return error; 227 *stackp += LINUX_SP_WRAP; 228 } 229 #endif 230 231 return 0; 232 } 233