linux32_exec.c revision 1.3.2.1
1 /* $NetBSD: linux32_exec.c,v 1.3.2.1 2007/01/30 13:51:34 ad 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 1.3.2.1 2007/01/30 13:51:34 ad 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 <machine/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 __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 void linux32_userret __P((struct lwp *, void *)); 88 void linux_nptl_proc_fork __P((struct proc *, struct proc *, 89 void (luserret)(struct lwp *, void *))); 90 void linux_nptl_proc_exit __P((struct proc *)); 91 void linux_nptl_proc_init __P((struct proc *, struct proc *)); 92 #endif 93 94 /* 95 * Emulation switch. 96 */ 97 98 struct uvm_object *emul_linux32_object; 99 100 const struct emul emul_linux32 = { 101 "linux32", 102 "/emul/linux32", 103 #ifndef __HAVE_MINIMAL_EMUL 104 0, 105 NULL, 106 LINUX32_SYS_syscall, 107 LINUX32_SYS_NSYSENT, 108 #endif 109 linux32_sysent, 110 linux32_syscallnames, 111 linux32_sendsig, 112 trapsignal, 113 NULL, 114 linux32_sigcode, 115 linux32_esigcode, 116 &emul_linux32_object, 117 linux32_setregs, 118 linux32_e_proc_exec, 119 linux32_e_proc_fork, 120 linux32_e_proc_exit, 121 NULL, 122 NULL, 123 linux32_syscall_intern, 124 NULL, 125 NULL, 126 netbsd32_vm_default_addr, 127 }; 128 129 static void 130 linux32_e_proc_init(p, parent, forkflags) 131 struct proc *p, *parent; 132 int forkflags; 133 { 134 struct linux_emuldata *e = p->p_emuldata; 135 struct linux_emuldata_shared *s; 136 struct linux_emuldata *ep = NULL; 137 138 if (!e) { 139 /* allocate new Linux emuldata */ 140 MALLOC(e, void *, sizeof(struct linux_emuldata), 141 M_EMULDATA, M_WAITOK); 142 } else { 143 e->s->refs--; 144 if (e->s->refs == 0) 145 FREE(e->s, M_EMULDATA); 146 } 147 148 memset(e, '\0', sizeof(struct linux_emuldata)); 149 150 e->proc = p; 151 152 if (parent) 153 ep = parent->p_emuldata; 154 155 if (forkflags & FORK_SHAREVM) { 156 #ifdef DIAGNOSTIC 157 if (ep == NULL) { 158 killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); 159 return; 160 } 161 #endif 162 s = ep->s; 163 s->refs++; 164 } else { 165 struct vmspace *vm; 166 167 MALLOC(s, void *, sizeof(struct linux_emuldata_shared), 168 M_EMULDATA, M_WAITOK); 169 s->refs = 1; 170 171 /* 172 * Set the process idea of the break to the real value. 173 * For fork, we use parent's vmspace since our's 174 * is not setup at the time of this call and is going 175 * to be copy of parent's anyway. For exec, just 176 * use our own vmspace. 177 */ 178 vm = (parent) ? parent->p_vmspace : p->p_vmspace; 179 s->p_break = vm->vm_daddr + ctob(vm->vm_dsize); 180 181 /* 182 * Linux threads are emulated as NetBSD processes (not lwp) 183 * We use native PID for Linux TID. The Linux TID is the 184 * PID of the first process in the group. It is stored 185 * here 186 */ 187 s->group_pid = p->p_pid; 188 189 /* 190 * Initialize the list of threads in the group 191 */ 192 LIST_INIT(&s->threads); 193 194 s->xstat = 0; 195 s->flags = 0; 196 } 197 198 e->s = s; 199 200 /* 201 * Add this thread in the group thread list 202 */ 203 LIST_INSERT_HEAD(&s->threads, e, threads); 204 205 #ifdef LINUX32_NPTL 206 linux_nptl_proc_init(p, parent); 207 #endif /* LINUX32_NPTL */ 208 209 p->p_emuldata = e; 210 } 211 212 /* 213 * Allocate new per-process structures. Called when executing Linux 214 * process. We can reuse the old emuldata - if it's not null, 215 * the executed process is of same emulation as original forked one. 216 */ 217 static void 218 linux32_e_proc_exec(p, epp) 219 struct proc *p; 220 struct exec_package *epp; 221 { 222 /* exec, use our vmspace */ 223 linux32_e_proc_init(p, NULL, 0); 224 } 225 226 /* 227 * Emulation per-process exit hook. 228 */ 229 static void 230 linux32_e_proc_exit(p) 231 struct proc *p; 232 { 233 struct linux_emuldata *e = p->p_emuldata; 234 235 #ifdef LINUX32_NPTL 236 linux_nptl_proc_exit(p); 237 #endif /* LINUX32_NPTL */ 238 239 /* Remove the thread for the group thread list */ 240 LIST_REMOVE(e, threads); 241 242 /* free Linux emuldata and set the pointer to null */ 243 e->s->refs--; 244 if (e->s->refs == 0) 245 FREE(e->s, M_EMULDATA); 246 FREE(e, M_EMULDATA); 247 p->p_emuldata = NULL; 248 } 249 250 /* 251 * Emulation fork hook. 252 */ 253 static void 254 linux32_e_proc_fork(p, parent, forkflags) 255 struct proc *p, *parent; 256 int forkflags; 257 { 258 /* 259 * The new process might share some vmspace-related stuff 260 * with parent, depending on fork flags (CLONE_VM et.al). 261 * Force allocation of new base emuldata, and share the 262 * VM-related parts only if necessary. 263 */ 264 p->p_emuldata = NULL; 265 linux32_e_proc_init(p, parent, forkflags); 266 267 #ifdef LINUX32_NPTL 268 linux_nptl_proc_fork(p, parent, (*linux32_userret)); 269 #endif 270 271 return; 272 } 273 274 #ifdef LINUX32_NPTL 275 void 276 linux32_userret(l, arg) 277 struct lwp *l; 278 void *arg; 279 { 280 struct proc *p = l->l_proc; 281 struct linux_emuldata *led = p->p_emuldata; 282 int error; 283 284 p->p_userret = NULL; 285 286 /* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */ 287 if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) { 288 if ((error = copyout(&l->l_proc->p_pid, 289 led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0) 290 printf("linux32_userret: LINUX_CLONE_CHILD_SETTID " 291 "failed (led->child_tidptr = %p, p->p_pid = %d)\n", 292 led->child_tidptr, p->p_pid); 293 } 294 295 /* LINUX_CLONE_SETTLS: allocate a new TLS */ 296 if (led->clone_flags & LINUX_CLONE_SETTLS) { 297 if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0) 298 printf("linux32_userret: linux32_set_tls failed"); 299 } 300 301 return; 302 } 303 #endif /* LINUX32_NPTL */ 304
Indexes created Thu Oct 02 10:09:58 GMT 2025