1 /* $NetBSD: linux_exec.c,v 1.60 2002/11/01 19:26:22 jdolecek 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 1.60 2002/11/01 19:26:22 jdolecek 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 57 #include <machine/cpu.h> 58 #include <machine/reg.h> 59 60 #include <compat/linux/common/linux_types.h> 61 #include <compat/linux/common/linux_signal.h> 62 #include <compat/linux/common/linux_util.h> 63 #include <compat/linux/common/linux_exec.h> 64 #include <compat/linux/common/linux_machdep.h> 65 66 #include <compat/linux/linux_syscallargs.h> 67 #include <compat/linux/linux_syscall.h> 68 #include <compat/linux/common/linux_misc.h> 69 #include <compat/linux/common/linux_errno.h> 70 #include <compat/linux/common/linux_emuldata.h> 71 72 extern struct sysent linux_sysent[]; 73 extern const char * const linux_syscallnames[]; 74 extern char linux_sigcode[], linux_esigcode[]; 75 #ifndef __HAVE_SYSCALL_INTERN 76 void LINUX_SYSCALL_FUNCTION __P((void)); 77 #endif 78 79 static void linux_e_proc_exec __P((struct proc *, struct exec_package *)); 80 static void linux_e_proc_fork __P((struct proc *, struct proc *)); 81 static void linux_e_proc_exit __P((struct proc *)); 82 static void linux_e_proc_init __P((struct proc *, struct vmspace *)); 83 84 /* 85 * Execve(2). Just check the alternate emulation path, and pass it on 86 * to the NetBSD execve(). 87 */ 88 int 89 linux_sys_execve(p, v, retval) 90 struct proc *p; 91 void *v; 92 register_t *retval; 93 { 94 struct linux_sys_execve_args /* { 95 syscallarg(const char *) path; 96 syscallarg(char **) argv; 97 syscallarg(char **) envp; 98 } */ *uap = v; 99 struct sys_execve_args ap; 100 caddr_t sg; 101 102 sg = stackgap_init(p, 0); 103 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 104 105 SCARG(&ap, path) = SCARG(uap, path); 106 SCARG(&ap, argp) = SCARG(uap, argp); 107 SCARG(&ap, envp) = SCARG(uap, envp); 108 109 return sys_execve(p, &ap, retval); 110 } 111 112 /* 113 * Emulation switch. 114 */ 115 const struct emul emul_linux = { 116 "linux", 117 "/emul/linux", 118 #ifndef __HAVE_MINIMAL_EMUL 119 0, 120 (int*)native_to_linux_errno, 121 LINUX_SYS_syscall, 122 LINUX_SYS_NSYSENT, 123 #endif 124 linux_sysent, 125 linux_syscallnames, 126 linux_sendsig, 127 linux_trapsignal, 128 linux_sigcode, 129 linux_esigcode, 130 linux_setregs, 131 linux_e_proc_exec, 132 linux_e_proc_fork, 133 linux_e_proc_exit, 134 #ifdef __HAVE_SYSCALL_INTERN 135 linux_syscall_intern, 136 #else 137 LINUX_SYSCALL_FUNCTION, 138 #endif 139 linux_sysctl, 140 NULL, 141 }; 142 143 static void 144 linux_e_proc_init(p, vmspace) 145 struct proc *p; 146 struct vmspace *vmspace; 147 { 148 if (!p->p_emuldata) { 149 /* allocate new Linux emuldata */ 150 MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata), 151 M_EMULDATA, M_WAITOK); 152 } 153 154 memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata)); 155 156 /* Set the process idea of the break to the real value */ 157 ((struct linux_emuldata*)(p->p_emuldata))->p_break = 158 vmspace->vm_daddr + ctob(vmspace->vm_dsize); 159 } 160 161 /* 162 * Allocate per-process structures. Called when executing Linux 163 * process. We can reuse the old emuldata - if it's not null, 164 * the executed process is of same emulation as original forked one. 165 */ 166 static void 167 linux_e_proc_exec(p, epp) 168 struct proc *p; 169 struct exec_package *epp; 170 { 171 /* exec, use our vmspace */ 172 linux_e_proc_init(p, p->p_vmspace); 173 } 174 175 /* 176 * Emulation per-process exit hook. 177 */ 178 static void 179 linux_e_proc_exit(p) 180 struct proc *p; 181 { 182 /* free Linux emuldata and set the pointer to null */ 183 FREE(p->p_emuldata, M_EMULDATA); 184 p->p_emuldata = NULL; 185 } 186 187 /* 188 * Emulation fork hook. 189 */ 190 static void 191 linux_e_proc_fork(p, parent) 192 struct proc *p, *parent; 193 { 194 /* 195 * It could be desirable to copy some stuff from parent's 196 * emuldata. We don't need anything like that for now. 197 * So just allocate new emuldata for the new process. 198 */ 199 p->p_emuldata = NULL; 200 201 /* fork, use parent's vmspace (our vmspace may not be setup yet) */ 202 linux_e_proc_init(p, parent->p_vmspace); 203 } 204