linux_exec.c revision 1.39
1 /* $NetBSD: linux_exec.c,v 1.39 2000/11/21 12:23:29 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 1994, 1995, 1998 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/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/proc.h> 44 #include <sys/malloc.h> 45 #include <sys/namei.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/exec.h> 49 #include <sys/exec_elf.h> 50 51 #include <sys/mman.h> 52 #include <sys/syscallargs.h> 53 54 #include <machine/cpu.h> 55 #include <machine/reg.h> 56 57 #include <compat/linux/common/linux_types.h> 58 #include <compat/linux/common/linux_signal.h> 59 #include <compat/linux/common/linux_util.h> 60 #include <compat/linux/common/linux_exec.h> 61 #include <compat/linux/common/linux_machdep.h> 62 63 #include <compat/linux/linux_syscallargs.h> 64 #include <compat/linux/linux_syscall.h> 65 #include <compat/linux/common/linux_misc.h> 66 #include <compat/linux/common/linux_errno.h> 67 #include <compat/linux/common/linux_emuldata.h> 68 69 const char linux_emul_path[] = "/emul/linux"; 70 71 extern struct sysent linux_sysent[]; 72 extern const char * const linux_syscallnames[]; 73 extern char linux_sigcode[], linux_esigcode[]; 74 75 static void linux_e_proc_exec __P((struct proc *, struct exec_package *)); 76 static void linux_e_proc_fork __P((struct proc *, struct proc *)); 77 static void linux_e_proc_exit __P((struct proc *)); 78 79 /* 80 * Execve(2). Just check the alternate emulation path, and pass it on 81 * to the NetBSD execve(). 82 */ 83 int 84 linux_sys_execve(p, v, retval) 85 struct proc *p; 86 void *v; 87 register_t *retval; 88 { 89 struct linux_sys_execve_args /* { 90 syscallarg(const char *) path; 91 syscallarg(char **) argv; 92 syscallarg(char **) envp; 93 } */ *uap = v; 94 struct sys_execve_args ap; 95 caddr_t sg; 96 97 sg = stackgap_init(p->p_emul); 98 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 99 100 SCARG(&ap, path) = SCARG(uap, path); 101 SCARG(&ap, argp) = SCARG(uap, argp); 102 SCARG(&ap, envp) = SCARG(uap, envp); 103 104 return sys_execve(p, &ap, retval); 105 } 106 107 /* 108 * Emulation switch. 109 */ 110 const struct emul emul_linux = { 111 "linux", 112 native_to_linux_errno, 113 linux_sendsig, 114 LINUX_SYS_syscall, 115 LINUX_SYS_MAXSYSCALL, 116 linux_sysent, 117 linux_syscallnames, 118 linux_sigcode, 119 linux_esigcode, 120 linux_e_proc_exec, 121 linux_e_proc_fork, 122 linux_e_proc_exit, 123 }; 124 125 /* 126 * Allocate per-process structures. Called when executing Linux 127 * process. We can re-used the old emuldata - if it's not null, 128 * the executed process is of same emulation as original forked one. 129 */ 130 static void 131 linux_e_proc_exec(p, epp) 132 struct proc *p; 133 struct exec_package *epp; 134 { 135 if (!p->p_emuldata) { 136 /* allocate new Linux emuldata */ 137 MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata), 138 M_EMULDATA, M_WAITOK); 139 } 140 141 memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata)); 142 } 143 144 /* 145 * Emulation per-process exit hook. 146 */ 147 static void 148 linux_e_proc_exit(p) 149 struct proc *p; 150 { 151 /* free Linux emuldata and set the pointer to null */ 152 FREE(p->p_emuldata, M_EMULDATA); 153 p->p_emuldata = NULL; 154 } 155 156 /* 157 * Emulation fork hook. 158 */ 159 static void 160 linux_e_proc_fork(p, parent) 161 struct proc *p, *parent; 162 { 163 /* 164 * It could be desirable to copy some stuff from parent's 165 * emuldata. We don't need anything like that for now. 166 * So just allocate new emuldata for the new process. 167 */ 168 p->p_emuldata = NULL; 169 linux_e_proc_exec(p, NULL); 170 } 171
Indexes created Thu Sep 25 02:09:54 GMT 2025