1 /* $NetBSD: linux32_exec_elf32.c,v 1.1 2006/02/09 19:18:57 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2000, 2001,2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and 9 * Emmanuel Dreyfus. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.1 2006/02/09 19:18:57 manu Exp $"); 42 43 #define ELFSIZE 32 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/malloc.h> 49 #include <sys/vnode.h> 50 #include <sys/exec.h> 51 #include <sys/exec_elf.h> 52 #include <sys/kernel.h> 53 #include <sys/resourcevar.h> 54 #include <sys/signal.h> 55 #include <sys/signalvar.h> 56 57 #include <compat/linux/common/linux_exec.h> 58 #include <compat/netbsd32/netbsd32.h> 59 #include <compat/netbsd32/netbsd32_exec.h> 60 #include <compat/linux32/common/linux32_exec.h> 61 62 #include <machine/frame.h> 63 64 #ifdef DEBUG_LINUX 65 #define DPRINTF(a) uprintf a 66 #else 67 #define DPRINTF(a) 68 #endif 69 70 #if 0 71 static int ELFNAME2(linux32,signature) __P((struct lwp *, struct exec_package *, 72 Elf_Ehdr *, char *)); 73 #ifdef LINUX_GCC_SIGNATURE 74 static int ELFNAME2(linux32,gcc_signature) __P((struct lwp *l, 75 struct exec_package *, Elf_Ehdr *)); 76 #endif 77 #ifdef LINUX_ATEXIT_SIGNATURE 78 static int ELFNAME2(linux32,atexit_signature) __P((struct lwp *l, 79 struct exec_package *, Elf_Ehdr *)); 80 #endif 81 #endif 82 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 83 void *, size_t, const void *, const void *); 84 85 int 86 ELFNAME2(linux32,probe)(l, epp, eh, itp, pos) 87 struct lwp *l; 88 struct exec_package *epp; 89 void *eh; 90 char *itp; 91 vaddr_t *pos; 92 { 93 int error; 94 95 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 96 #ifdef LINUX_GCC_SIGNATURE 97 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 98 #endif 99 #ifdef LINUX_ATEXIT_SIGNATURE 100 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 101 #endif 102 1) 103 return error; 104 105 if (itp) { 106 if ((error = emul_find_interp(l, epp->ep_esch->es_emul->e_path, 107 itp))) 108 return (error); 109 } 110 #if 0 111 DPRINTF(("linux32_probe: returning 0\n")); 112 #endif 113 114 epp->ep_flags |= EXEC_32; 115 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 116 epp->ep_vm_maxaddr = USRSTACK32; 117 118 return 0; 119 } 120 121 /* round up and down to page boundaries. */ 122 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 123 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 124 125 /* 126 * Copy arguments onto the stack in the normal way, but add some 127 * extra information in case of dynamic binding. 128 */ 129 int 130 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 131 struct ps_strings *arginfo, char **stackp, void *argp) 132 { 133 struct linux32_extra_stack_data *esdp, esd; 134 struct elf_args *ap; 135 struct vattr *vap; 136 struct proc *p; 137 Elf_Ehdr *eh; 138 Elf_Phdr *ph; 139 Elf_Addr phdr = 0; 140 u_long phsize; 141 int error; 142 int i; 143 144 p = l->l_proc; 145 146 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 147 return error; 148 149 /* 150 * Push extra arguments on the stack needed by dynamically 151 * linked binaries and static binaries as well. 152 */ 153 memset(&esd, 0, sizeof(esd)); 154 esdp = (struct linux32_extra_stack_data *)(*stackp); 155 ap = (struct elf_args *)pack->ep_emul_arg; 156 vap = pack->ep_vap; 157 eh = (Elf_Ehdr *)pack->ep_hdr; 158 159 /* 160 * We forgot this, so we ned to reload it now. XXX keep track of it? 161 */ 162 if (ap == NULL) { 163 phsize = eh->e_phnum * sizeof(Elf_Phdr); 164 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 165 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 166 if (error != 0) { 167 for (i = 0; i < eh->e_phnum; i++) { 168 if (ph[i].p_type == PT_PHDR) { 169 phdr = ph[i].p_vaddr; 170 break; 171 } 172 } 173 } 174 free(ph, M_TEMP); 175 } 176 177 178 /* 179 * The exec_package doesn't have a proc pointer and it's not 180 * exactly trivial to add one since the credentials are 181 * changing. XXX Linux uses curlwp's credentials. 182 * Why can't we use them too? 183 */ 184 185 i = 0; 186 esd.ai[i].a_type = LINUX_AT_SYSINFO; 187 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->kernel_vsyscall[0]; 188 189 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 190 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->elfhdr; 191 192 esd.ai[i].a_type = LINUX_AT_HWCAP; 193 esd.ai[i++].a_v = LINUX32_CPUCAP; 194 195 esd.ai[i].a_type = AT_PAGESZ; 196 esd.ai[i++].a_v = PAGE_SIZE; 197 198 esd.ai[i].a_type = LINUX_AT_CLKTCK; 199 esd.ai[i++].a_v = hz; 200 201 esd.ai[i].a_type = AT_PHDR; 202 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 203 204 esd.ai[i].a_type = AT_PHENT; 205 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 206 207 esd.ai[i].a_type = AT_PHNUM; 208 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 209 210 esd.ai[i].a_type = AT_BASE; 211 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 212 213 esd.ai[i].a_type = AT_FLAGS; 214 esd.ai[i++].a_v = 0; 215 216 esd.ai[i].a_type = AT_ENTRY; 217 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 218 219 esd.ai[i].a_type = LINUX_AT_EGID; 220 esd.ai[i++].a_v = 221 ((vap->va_mode & S_ISGID) ? vap->va_gid : p->p_ucred->cr_gid); 222 223 esd.ai[i].a_type = LINUX_AT_GID; 224 esd.ai[i++].a_v = p->p_cred->p_rgid; 225 226 esd.ai[i].a_type = LINUX_AT_EUID; 227 esd.ai[i++].a_v = 228 ((vap->va_mode & S_ISUID) ? vap->va_uid : p->p_ucred->cr_uid); 229 230 esd.ai[i].a_type = LINUX_AT_UID; 231 esd.ai[i++].a_v = p->p_cred->p_ruid; 232 233 esd.ai[i].a_type = LINUX_AT_SECURE; 234 esd.ai[i++].a_v = 0; 235 236 esd.ai[i].a_type = LINUX_AT_PLATFORM; 237 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->hw_platform[0]; 238 239 esd.ai[i].a_type = AT_NULL; 240 esd.ai[i++].a_v = 0; 241 242 #ifdef DEBUG_LINUX 243 if (i != LINUX32_ELF_AUX_ENTRIES) { 244 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 245 return EINVAL; 246 } 247 #endif 248 249 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 250 sizeof(linux32_kernel_vsyscall)); 251 252 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 253 254 strcpy(esd.hw_platform, LINUX32_PLATFORM); 255 256 if (ap) { 257 free((char *)ap, M_TEMP); 258 pack->ep_emul_arg = NULL; 259 } 260 261 /* 262 * Copy out the ELF auxiliary table and hw platform name 263 */ 264 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 265 return error; 266 *stackp += sizeof(esd); 267 return 0; 268 } 269 270