1 /* $NetBSD: linux_exec.c,v 1.61 2003/01/18 08:02:51 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1994, 1995, 1998, 2000 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 * Thor Lancelot Simon. 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: linux_exec.c,v 1.61 2003/01/18 08:02:51 thorpej 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 <machine/cpu.h> 59 #include <machine/reg.h> 60 61 #include <compat/linux/common/linux_types.h> 62 #include <compat/linux/common/linux_signal.h> 63 #include <compat/linux/common/linux_util.h> 64 #include <compat/linux/common/linux_exec.h> 65 #include <compat/linux/common/linux_machdep.h> 66 67 #include <compat/linux/linux_syscallargs.h> 68 #include <compat/linux/linux_syscall.h> 69 #include <compat/linux/common/linux_misc.h> 70 #include <compat/linux/common/linux_errno.h> 71 #include <compat/linux/common/linux_emuldata.h> 72 73 extern struct sysent linux_sysent[]; 74 extern const char * const linux_syscallnames[]; 75 extern char linux_sigcode[], linux_esigcode[]; 76 #ifndef __HAVE_SYSCALL_INTERN 77 void LINUX_SYSCALL_FUNCTION __P((void)); 78 #endif 79 80 static void linux_e_proc_exec __P((struct proc *, struct exec_package *)); 81 static void linux_e_proc_fork __P((struct proc *, struct proc *)); 82 static void linux_e_proc_exit __P((struct proc *)); 83 static void linux_e_proc_init __P((struct proc *, struct vmspace *)); 84 85 /* 86 * Execve(2). Just check the alternate emulation path, and pass it on 87 * to the NetBSD execve(). 88 */ 89 int 90 linux_sys_execve(l, v, retval) 91 struct lwp *l; 92 void *v; 93 register_t *retval; 94 { 95 struct linux_sys_execve_args /* { 96 syscallarg(const char *) path; 97 syscallarg(char **) argv; 98 syscallarg(char **) envp; 99 } */ *uap = v; 100 struct proc *p = l->l_proc; 101 struct sys_execve_args ap; 102 caddr_t sg; 103 104 sg = stackgap_init(p, 0); 105 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 106 107 SCARG(&ap, path) = SCARG(uap, path); 108 SCARG(&ap, argp) = SCARG(uap, argp); 109 SCARG(&ap, envp) = SCARG(uap, envp); 110 111 return sys_execve(l, &ap, retval); 112 } 113 114 /* 115 * Emulation switch. 116 */ 117 const struct emul emul_linux = { 118 "linux", 119 "/emul/linux", 120 #ifndef __HAVE_MINIMAL_EMUL 121 0, 122 (int*)native_to_linux_errno, 123 LINUX_SYS_syscall, 124 LINUX_SYS_NSYSENT, 125 #endif 126 linux_sysent, 127 linux_syscallnames, 128 linux_sendsig, 129 linux_trapsignal, 130 linux_sigcode, 131 linux_esigcode, 132 linux_setregs, 133 linux_e_proc_exec, 134 linux_e_proc_fork, 135 linux_e_proc_exit, 136 #ifdef __HAVE_SYSCALL_INTERN 137 linux_syscall_intern, 138 #else 139 LINUX_SYSCALL_FUNCTION, 140 #endif 141 linux_sysctl, 142 NULL, 143 }; 144 145 static void 146 linux_e_proc_init(p, vmspace) 147 struct proc *p; 148 struct vmspace *vmspace; 149 { 150 if (!p->p_emuldata) { 151 /* allocate new Linux emuldata */ 152 MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata), 153 M_EMULDATA, M_WAITOK); 154 } 155 156 memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata)); 157 158 /* Set the process idea of the break to the real value */ 159 ((struct linux_emuldata*)(p->p_emuldata))->p_break = 160 vmspace->vm_daddr + ctob(vmspace->vm_dsize); 161 } 162 163 /* 164 * Allocate per-process structures. Called when executing Linux 165 * process. We can reuse the old emuldata - if it's not null, 166 * the executed process is of same emulation as original forked one. 167 */ 168 static void 169 linux_e_proc_exec(p, epp) 170 struct proc *p; 171 struct exec_package *epp; 172 { 173 /* exec, use our vmspace */ 174 linux_e_proc_init(p, p->p_vmspace); 175 } 176 177 /* 178 * Emulation per-process exit hook. 179 */ 180 static void 181 linux_e_proc_exit(p) 182 struct proc *p; 183 { 184 /* free Linux emuldata and set the pointer to null */ 185 FREE(p->p_emuldata, M_EMULDATA); 186 p->p_emuldata = NULL; 187 } 188 189 /* 190 * Emulation fork hook. 191 */ 192 static void 193 linux_e_proc_fork(p, parent) 194 struct proc *p, *parent; 195 { 196 /* 197 * It could be desirable to copy some stuff from parent's 198 * emuldata. We don't need anything like that for now. 199 * So just allocate new emuldata for the new process. 200 */ 201 p->p_emuldata = NULL; 202 203 /* fork, use parent's vmspace (our vmspace may not be setup yet) */ 204 linux_e_proc_init(p, parent->p_vmspace); 205 } 206