linux32_exec.c revision 1.1.10.2
1 /* $NetBSD: linux32_exec.c,v 1.1.10.2 2006/04/22 11:38:14 simonb Exp $ */ 2 3 /*- 4 * Copyright (c) 1994-2006 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, 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 1.1.10.2 2006/04/22 11:38:14 simonb 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/sa.h> 56 #include <sys/syscallargs.h> 57 58 #include <uvm/uvm_extern.h> 59 60 #include <machine/cpu.h> 61 #include <machine/reg.h> 62 63 #include <compat/linux/common/linux_types.h> 64 65 #include <compat/linux32/common/linux32_exec.h> 66 #include <compat/linux32/common/linux32_types.h> 67 #include <compat/linux32/common/linux32_signal.h> 68 #include <compat/linux32/common/linux32_machdep.h> 69 #include <compat/linux32/common/linux32_emuldata.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 __P((struct proc *, struct exec_package *)); 82 static void linux32_e_proc_fork __P((struct proc *, struct proc *, int)); 83 static void linux32_e_proc_exit __P((struct proc *)); 84 static void linux32_e_proc_init __P((struct proc *, struct proc *, int)); 85 86 #ifdef LINUX32_NPTL 87 static void linux32_userret __P((struct lwp *, void *)); 88 #endif 89 90 /* 91 * Emulation switch. 92 */ 93 94 struct uvm_object *emul_linux32_object; 95 96 const struct emul emul_linux32 = { 97 "linux32", 98 "/emul/linux32", 99 #ifndef __HAVE_MINIMAL_EMUL 100 0, 101 NULL, 102 LINUX32_SYS_syscall, 103 LINUX32_SYS_NSYSENT, 104 #endif 105 linux32_sysent, 106 linux32_syscallnames, 107 linux32_sendsig, 108 trapsignal, 109 NULL, 110 linux32_sigcode, 111 linux32_esigcode, 112 &emul_linux32_object, 113 linux32_setregs, 114 linux32_e_proc_exec, 115 linux32_e_proc_fork, 116 linux32_e_proc_exit, 117 NULL, 118 NULL, 119 linux32_syscall_intern, 120 NULL, 121 NULL, 122 netbsd32_vm_default_addr, 123 }; 124 125 static void 126 linux32_e_proc_init(p, parent, forkflags) 127 struct proc *p, *parent; 128 int forkflags; 129 { 130 struct linux32_emuldata *e = p->p_emuldata; 131 struct linux32_emuldata_shared *s; 132 struct linux32_emuldata *ep = NULL; 133 134 if (!e) { 135 /* allocate new Linux emuldata */ 136 MALLOC(e, void *, sizeof(struct linux32_emuldata), 137 M_EMULDATA, M_WAITOK); 138 } else { 139 e->s->refs--; 140 if (e->s->refs == 0) 141 FREE(e->s, M_EMULDATA); 142 } 143 144 memset(e, '\0', sizeof(struct linux32_emuldata)); 145 146 if (parent) 147 ep = parent->p_emuldata; 148 149 if (forkflags & FORK_SHAREVM) { 150 #ifdef DIAGNOSTIC 151 if (ep == NULL) { 152 killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); 153 return; 154 } 155 #endif 156 s = ep->s; 157 s->refs++; 158 } else { 159 struct vmspace *vm; 160 161 MALLOC(s, void *, sizeof(struct linux32_emuldata_shared), 162 M_EMULDATA, M_WAITOK); 163 s->refs = 1; 164 165 /* 166 * Set the process idea of the break to the real value. 167 * For fork, we use parent's vmspace since our's 168 * is not setup at the time of this call and is going 169 * to be copy of parent's anyway. For exec, just 170 * use our own vmspace. 171 */ 172 vm = (parent) ? parent->p_vmspace : p->p_vmspace; 173 s->p_break = vm->vm_daddr + ctob(vm->vm_dsize); 174 175 /* 176 * Linux threads are emulated as NetBSD processes (not lwp) 177 * We use native PID for Linux TID. The Linux TID is the 178 * PID of the first process in the group. It is stored 179 * here 180 */ 181 s->group_pid = p->p_pid; 182 } 183 184 e->s = s; 185 186 #ifdef LINUX32_NPTL 187 /* 188 * initialize TID pointers. ep->child_clear_tid and 189 * ep->child_set_tid will not be used beyond this point. 190 */ 191 e->child_clear_tid = NULL; 192 e->child_set_tid = NULL; 193 if (ep != NULL) { 194 e->clear_tid = ep->child_clear_tid; 195 e->set_tid = ep->child_set_tid; 196 e->set_tls = ep->set_tls; 197 ep->child_clear_tid = NULL; 198 ep->child_set_tid = NULL; 199 ep->set_tls = 0; 200 } else { 201 e->clear_tid = NULL; 202 e->set_tid = NULL; 203 e->set_tls = 0; 204 } 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(p, epp) 217 struct proc *p; 218 struct exec_package *epp; 219 { 220 /* exec, use our vmspace */ 221 linux32_e_proc_init(p, NULL, 0); 222 } 223 224 /* 225 * Emulation per-process exit hook. 226 */ 227 static void 228 linux32_e_proc_exit(p) 229 struct proc *p; 230 { 231 struct linux32_emuldata *e = p->p_emuldata; 232 233 #ifdef LINUX32_NPTL 234 /* Emulate LINUX_CLONE_CHILD_CLEARTID */ 235 if (e->clear_tid != NULL) { 236 int error; 237 int null = 0; 238 struct linux32_sys_futex_args cup; 239 register_t retval; 240 struct lwp *l; 241 242 if ((error = copyout(&null, 243 e->clear_tid, 244 sizeof(null))) != 0) 245 printf("linux32_e_proc_exit: cannot clear TID\n"); 246 247 l = proc_representative_lwp(p); 248 SCARG(&cup, uaddr) = e->clear_tid; 249 SCARG(&cup, op) = LINUX_FUTEX_WAKE; 250 SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */ 251 SCARG(&cup, timeout) = NULL; 252 SCARG(&cup, uaddr2) = NULL; 253 SCARG(&cup, val3) = 0; 254 if ((error = linux32_sys_futex(l, &cup, &retval)) != 0) 255 printf("linux32_e_proc_exit: linux_sys_futex failed\n"); 256 } 257 #endif /* LINUX32_NPTL */ 258 259 /* free Linux emuldata and set the pointer to null */ 260 e->s->refs--; 261 if (e->s->refs == 0) 262 FREE(e->s, M_EMULDATA); 263 FREE(e, M_EMULDATA); 264 p->p_emuldata = NULL; 265 } 266 267 /* 268 * Emulation fork hook. 269 */ 270 static void 271 linux32_e_proc_fork(p, parent, forkflags) 272 struct proc *p, *parent; 273 int forkflags; 274 { 275 #ifdef LINUX32_NPTL 276 struct linux32_emuldata *e; 277 #endif 278 279 /* 280 * The new process might share some vmspace-related stuff 281 * with parent, depending on fork flags (CLONE_VM et.al). 282 * Force allocation of new base emuldata, and share the 283 * VM-related parts only if necessary. 284 */ 285 p->p_emuldata = NULL; 286 linux32_e_proc_init(p, parent, forkflags); 287 288 #ifdef LINUX32_NPTL 289 /* 290 * Emulate LINUX_CLONE_CHILD_SETTID and LINUX_CLONE_TLS: 291 * This cannot be done right now because the child VM 292 * is not set up. We will do it at userret time. 293 */ 294 e = p->p_emuldata; 295 if ((e->set_tid != NULL) || (e->set_tls != 0)) 296 p->p_userret = (*linux32_userret); 297 #endif 298 299 return; 300 } 301 302 #ifdef LINUX32_NPTL 303 static void 304 linux32_userret(l, arg) 305 struct lwp *l; 306 void *arg; 307 { 308 struct proc *p = l->l_proc; 309 struct linux32_emuldata *led = p->p_emuldata; 310 int error; 311 312 p->p_userret = NULL; 313 314 /* Emulate LINUX_CLONE_CHILD_SETTID */ 315 if (led->set_tid != NULL) { 316 if ((error = copyout(&p->p_pid, 317 led->set_tid, sizeof(p->p_pid))) != 0) 318 printf("linux32_userret: cannot set TID\n"); 319 } 320 321 /* Emulate LINUX_CLONE_NEWTLS */ 322 if (led->set_tls != 0) { 323 if (linux32_set_newtls(l, led->set_tls) != 0) 324 printf("linux32_userret: cannot set TLS\n"); 325 } 326 327 return; 328 } 329 #endif /* LINUX32_NPTL */ 330
Indexes created Thu Oct 02 10:09:58 GMT 2025