1 /* $NetBSD: linux32_exec.c,v 1.13 2008/04/28 20:23:44 martin 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux32_exec.c,v 1.13 2008/04/28 20:23:44 martin Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/malloc.h> 41 #include <sys/namei.h> 42 #include <sys/vnode.h> 43 #include <sys/mount.h> 44 #include <sys/exec.h> 45 #include <sys/exec_elf.h> 46 47 #include <sys/mman.h> 48 #include <sys/syscallargs.h> 49 #include <sys/ptrace.h> /* For proc_reparent() */ 50 51 #include <uvm/uvm_extern.h> 52 53 #include <sys/cpu.h> 54 #include <machine/reg.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_emuldata.h> 58 59 #include <compat/linux32/common/linux32_exec.h> 60 #include <compat/linux32/common/linux32_types.h> 61 #include <compat/linux32/common/linux32_signal.h> 62 #include <compat/linux32/common/linux32_machdep.h> 63 64 #include <compat/linux32/linux32_syscallargs.h> 65 #include <compat/linux32/linux32_syscall.h> 66 67 extern char linux32_sigcode[1]; 68 extern char linux32_rt_sigcode[1]; 69 extern char linux32_esigcode[1]; 70 71 extern struct sysent linux32_sysent[]; 72 extern const char * const linux32_syscallnames[]; 73 74 static void linux32_e_proc_exec(struct proc *, struct exec_package *); 75 static void linux32_e_proc_fork(struct proc *, struct proc *, int); 76 static void linux32_e_proc_exit(struct proc *); 77 static void linux32_e_proc_init(struct proc *, struct proc *, int); 78 79 #ifdef LINUX32_NPTL 80 void linux32_userret(void); 81 void linux_nptl_proc_fork(struct proc *, struct proc *, void (*luserret)(void)); 82 void linux_nptl_proc_exit(struct proc *); 83 void linux_nptl_proc_init(struct proc *, struct proc *); 84 #endif 85 86 /* 87 * Emulation switch. 88 */ 89 90 struct uvm_object *emul_linux32_object; 91 92 const struct emul emul_linux32 = { 93 "linux32", 94 "/emul/linux32", 95 #ifndef __HAVE_MINIMAL_EMUL 96 0, 97 NULL, 98 LINUX32_SYS_syscall, 99 LINUX32_SYS_NSYSENT, 100 #endif 101 linux32_sysent, 102 linux32_syscallnames, 103 linux32_sendsig, 104 trapsignal, 105 NULL, 106 linux32_sigcode, 107 linux32_esigcode, 108 &emul_linux32_object, 109 linux32_setregs, 110 linux32_e_proc_exec, 111 linux32_e_proc_fork, 112 linux32_e_proc_exit, 113 NULL, 114 NULL, 115 linux32_syscall_intern, 116 NULL, 117 NULL, 118 netbsd32_vm_default_addr, 119 }; 120 121 static void 122 linux32_e_proc_init(p, parent, forkflags) 123 struct proc *p, *parent; 124 int forkflags; 125 { 126 struct linux_emuldata *e = p->p_emuldata; 127 struct linux_emuldata_shared *s; 128 struct linux_emuldata *ep = NULL; 129 130 if (!e) { 131 /* allocate new Linux emuldata */ 132 MALLOC(e, void *, sizeof(struct linux_emuldata), 133 M_EMULDATA, M_WAITOK); 134 } else { 135 mutex_enter(proc_lock); 136 e->s->refs--; 137 if (e->s->refs == 0) 138 FREE(e->s, M_EMULDATA); 139 mutex_exit(proc_lock); 140 } 141 142 memset(e, '\0', sizeof(struct linux_emuldata)); 143 144 e->proc = p; 145 146 if (parent) 147 ep = parent->p_emuldata; 148 149 if (forkflags & FORK_SHAREVM) { 150 mutex_enter(proc_lock); 151 #ifdef DIAGNOSTIC 152 if (ep == NULL) { 153 killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); 154 mutex_exit(proc_lock); 155 return; 156 } 157 #endif 158 s = ep->s; 159 s->refs++; 160 } else { 161 struct vmspace *vm; 162 163 MALLOC(s, void *, sizeof(struct linux_emuldata_shared), 164 M_EMULDATA, M_WAITOK); 165 s->refs = 1; 166 167 /* 168 * Set the process idea of the break to the real value. 169 * For fork, we use parent's vmspace since our's 170 * is not setup at the time of this call and is going 171 * to be copy of parent's anyway. For exec, just 172 * use our own vmspace. 173 */ 174 vm = (parent) ? parent->p_vmspace : p->p_vmspace; 175 s->p_break = (char *)vm->vm_daddr + ctob(vm->vm_dsize); 176 177 /* 178 * Linux threads are emulated as NetBSD processes (not lwp) 179 * We use native PID for Linux TID. The Linux TID is the 180 * PID of the first process in the group. It is stored 181 * here 182 */ 183 s->group_pid = p->p_pid; 184 185 /* 186 * Initialize the list of threads in the group 187 */ 188 LIST_INIT(&s->threads); 189 190 s->xstat = 0; 191 s->flags = 0; 192 mutex_enter(proc_lock); 193 } 194 195 e->s = s; 196 197 /* 198 * Add this thread in the group thread list 199 */ 200 LIST_INSERT_HEAD(&s->threads, e, threads); 201 mutex_exit(proc_lock); 202 203 #ifdef LINUX32_NPTL 204 linux_nptl_proc_init(p, parent); 205 #endif /* LINUX32_NPTL */ 206 207 p->p_emuldata = e; 208 } 209 210 /* 211 * Allocate new per-process structures. Called when executing Linux 212 * process. We can reuse the old emuldata - if it's not null, 213 * the executed process is of same emulation as original forked one. 214 */ 215 static void 216 linux32_e_proc_exec(struct proc *p, struct exec_package *epp) 217 { 218 /* exec, use our vmspace */ 219 linux32_e_proc_init(p, NULL, 0); 220 } 221 222 /* 223 * Emulation per-process exit hook. 224 */ 225 static void 226 linux32_e_proc_exit(struct proc *p) 227 { 228 struct linux_emuldata *e = p->p_emuldata; 229 230 #ifdef LINUX32_NPTL 231 linux_nptl_proc_exit(p); 232 #endif /* LINUX32_NPTL */ 233 234 /* Remove the thread for the group thread list */ 235 mutex_enter(proc_lock); 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 p->p_emuldata = NULL; 243 mutex_exit(proc_lock); 244 FREE(e, M_EMULDATA); 245 } 246 247 /* 248 * Emulation fork hook. 249 */ 250 static void 251 linux32_e_proc_fork(p, parent, forkflags) 252 struct proc *p, *parent; 253 int forkflags; 254 { 255 /* 256 * The new process might share some vmspace-related stuff 257 * with parent, depending on fork flags (CLONE_VM et.al). 258 * Force allocation of new base emuldata, and share the 259 * VM-related parts only if necessary. 260 */ 261 p->p_emuldata = NULL; 262 linux32_e_proc_init(p, parent, forkflags); 263 264 #ifdef LINUX32_NPTL 265 linux_nptl_proc_fork(p, parent, linux32_userret); 266 #endif 267 268 return; 269 } 270 271 #ifdef LINUX32_NPTL 272 void 273 linux32_userret(void) 274 { 275 struct lwp *l = curlwp; 276 struct proc *p = l->l_proc; 277 struct linux_emuldata *led = p->p_emuldata; 278 int error; 279 280 /* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */ 281 if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) { 282 if ((error = copyout(&l->l_proc->p_pid, 283 led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0) 284 printf("linux32_userret: LINUX_CLONE_CHILD_SETTID " 285 "failed (led->child_tidptr = %p, p->p_pid = %d)\n", 286 led->child_tidptr, p->p_pid); 287 } 288 289 /* LINUX_CLONE_SETTLS: allocate a new TLS */ 290 if (led->clone_flags & LINUX_CLONE_SETTLS) { 291 if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0) 292 printf("linux32_userret: linux32_set_tls failed"); 293 } 294 295 return; 296 } 297 #endif /* LINUX32_NPTL */ 298