1 /* $NetBSD: linux32_exec.c,v 1.9 2007/12/08 18:36:11 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1994-2007 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, 9 * Thor Lancelot Simon, and 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.c,v 1.9 2007/12/08 18:36:11 dsl Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/malloc.h> 48 #include <sys/namei.h> 49 #include <sys/vnode.h> 50 #include <sys/mount.h> 51 #include <sys/exec.h> 52 #include <sys/exec_elf.h> 53 54 #include <sys/mman.h> 55 #include <sys/syscallargs.h> 56 #include <sys/ptrace.h> /* For proc_reparent() */ 57 58 #include <uvm/uvm_extern.h> 59 60 #include <sys/cpu.h> 61 #include <machine/reg.h> 62 63 #include <compat/linux/common/linux_types.h> 64 #include <compat/linux/common/linux_emuldata.h> 65 66 #include <compat/linux32/common/linux32_exec.h> 67 #include <compat/linux32/common/linux32_types.h> 68 #include <compat/linux32/common/linux32_signal.h> 69 #include <compat/linux32/common/linux32_machdep.h> 70 71 #include <compat/linux32/linux32_syscallargs.h> 72 #include <compat/linux32/linux32_syscall.h> 73 74 extern char linux32_sigcode[1]; 75 extern char linux32_rt_sigcode[1]; 76 extern char linux32_esigcode[1]; 77 78 extern struct sysent linux32_sysent[]; 79 extern const char * const linux32_syscallnames[]; 80 81 static void linux32_e_proc_exec(struct proc *, struct exec_package *); 82 static void linux32_e_proc_fork(struct proc *, struct proc *, int); 83 static void linux32_e_proc_exit(struct proc *); 84 static void linux32_e_proc_init(struct proc *, struct proc *, int); 85 86 #ifdef LINUX32_NPTL 87 void linux32_userret(void); 88 void linux_nptl_proc_fork(struct proc *, struct proc *, void (*luserret)(void)); 89 void linux_nptl_proc_exit(struct proc *); 90 void linux_nptl_proc_init(struct proc *, struct proc *); 91 #endif 92 93 /* 94 * Emulation switch. 95 */ 96 97 struct uvm_object *emul_linux32_object; 98 99 const struct emul emul_linux32 = { 100 "linux32", 101 "/emul/linux32", 102 #ifndef __HAVE_MINIMAL_EMUL 103 0, 104 NULL, 105 LINUX32_SYS_syscall, 106 LINUX32_SYS_NSYSENT, 107 #endif 108 linux32_sysent, 109 linux32_syscallnames, 110 linux32_sendsig, 111 trapsignal, 112 NULL, 113 linux32_sigcode, 114 linux32_esigcode, 115 &emul_linux32_object, 116 linux32_setregs, 117 linux32_e_proc_exec, 118 linux32_e_proc_fork, 119 linux32_e_proc_exit, 120 NULL, 121 NULL, 122 linux32_syscall_intern, 123 NULL, 124 NULL, 125 netbsd32_vm_default_addr, 126 }; 127 128 static void 129 linux32_e_proc_init(p, parent, forkflags) 130 struct proc *p, *parent; 131 int forkflags; 132 { 133 struct linux_emuldata *e = p->p_emuldata; 134 struct linux_emuldata_shared *s; 135 struct linux_emuldata *ep = NULL; 136 137 if (!e) { 138 /* allocate new Linux emuldata */ 139 MALLOC(e, void *, sizeof(struct linux_emuldata), 140 M_EMULDATA, M_WAITOK); 141 } else { 142 e->s->refs--; 143 if (e->s->refs == 0) 144 FREE(e->s, M_EMULDATA); 145 } 146 147 memset(e, '\0', sizeof(struct linux_emuldata)); 148 149 e->proc = p; 150 151 if (parent) 152 ep = parent->p_emuldata; 153 154 if (forkflags & FORK_SHAREVM) { 155 #ifdef DIAGNOSTIC 156 if (ep == NULL) { 157 killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); 158 return; 159 } 160 #endif 161 s = ep->s; 162 s->refs++; 163 } else { 164 struct vmspace *vm; 165 166 MALLOC(s, void *, sizeof(struct linux_emuldata_shared), 167 M_EMULDATA, M_WAITOK); 168 s->refs = 1; 169 170 /* 171 * Set the process idea of the break to the real value. 172 * For fork, we use parent's vmspace since our's 173 * is not setup at the time of this call and is going 174 * to be copy of parent's anyway. For exec, just 175 * use our own vmspace. 176 */ 177 vm = (parent) ? parent->p_vmspace : p->p_vmspace; 178 s->p_break = (char *)vm->vm_daddr + ctob(vm->vm_dsize); 179 180 /* 181 * Linux threads are emulated as NetBSD processes (not lwp) 182 * We use native PID for Linux TID. The Linux TID is the 183 * PID of the first process in the group. It is stored 184 * here 185 */ 186 s->group_pid = p->p_pid; 187 188 /* 189 * Initialize the list of threads in the group 190 */ 191 LIST_INIT(&s->threads); 192 193 s->xstat = 0; 194 s->flags = 0; 195 } 196 197 e->s = s; 198 199 /* 200 * Add this thread in the group thread list 201 */ 202 LIST_INSERT_HEAD(&s->threads, e, threads); 203 204 #ifdef LINUX32_NPTL 205 linux_nptl_proc_init(p, parent); 206 #endif /* LINUX32_NPTL */ 207 208 p->p_emuldata = e; 209 } 210 211 /* 212 * Allocate new per-process structures. Called when executing Linux 213 * process. We can reuse the old emuldata - if it's not null, 214 * the executed process is of same emulation as original forked one. 215 */ 216 static void 217 linux32_e_proc_exec(struct proc *p, struct exec_package *epp) 218 { 219 /* exec, use our vmspace */ 220 linux32_e_proc_init(p, NULL, 0); 221 } 222 223 /* 224 * Emulation per-process exit hook. 225 */ 226 static void 227 linux32_e_proc_exit(struct proc *p) 228 { 229 struct linux_emuldata *e = p->p_emuldata; 230 231 #ifdef LINUX32_NPTL 232 linux_nptl_proc_exit(p); 233 #endif /* LINUX32_NPTL */ 234 235 /* Remove the thread for the group thread list */ 236 LIST_REMOVE(e, threads); 237 238 /* free Linux emuldata and set the pointer to null */ 239 e->s->refs--; 240 if (e->s->refs == 0) 241 FREE(e->s, M_EMULDATA); 242 FREE(e, M_EMULDATA); 243 p->p_emuldata = NULL; 244 } 245 246 /* 247 * Emulation fork hook. 248 */ 249 static void 250 linux32_e_proc_fork(p, parent, forkflags) 251 struct proc *p, *parent; 252 int forkflags; 253 { 254 /* 255 * The new process might share some vmspace-related stuff 256 * with parent, depending on fork flags (CLONE_VM et.al). 257 * Force allocation of new base emuldata, and share the 258 * VM-related parts only if necessary. 259 */ 260 p->p_emuldata = NULL; 261 linux32_e_proc_init(p, parent, forkflags); 262 263 #ifdef LINUX32_NPTL 264 linux_nptl_proc_fork(p, parent, linux32_userret); 265 #endif 266 267 return; 268 } 269 270 #ifdef LINUX32_NPTL 271 void 272 linux32_userret(void) 273 { 274 struct lwp *l = curlwp; 275 struct proc *p = l->l_proc; 276 struct linux_emuldata *led = p->p_emuldata; 277 int error; 278 279 /* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */ 280 if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) { 281 if ((error = copyout(&l->l_proc->p_pid, 282 led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0) 283 printf("linux32_userret: LINUX_CLONE_CHILD_SETTID " 284 "failed (led->child_tidptr = %p, p->p_pid = %d)\n", 285 led->child_tidptr, p->p_pid); 286 } 287 288 /* LINUX_CLONE_SETTLS: allocate a new TLS */ 289 if (led->clone_flags & LINUX_CLONE_SETTLS) { 290 if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0) 291 printf("linux32_userret: linux32_set_tls failed"); 292 } 293 294 return; 295 } 296 #endif /* LINUX32_NPTL */ 297