1 /* $NetBSD: linux_exec.c,v 1.65 2003/08/24 17:52:43 chs 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 1.65 2003/08/24 17:52:43 chs 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 77 static void linux_e_proc_exec __P((struct proc *, struct exec_package *)); 78 static void linux_e_proc_fork __P((struct proc *, struct proc *)); 79 static void linux_e_proc_exit __P((struct proc *)); 80 static void linux_e_proc_init __P((struct proc *, struct vmspace *)); 81 82 /* 83 * Execve(2). Just check the alternate emulation path, and pass it on 84 * to the NetBSD execve(). 85 */ 86 int 87 linux_sys_execve(l, v, retval) 88 struct lwp *l; 89 void *v; 90 register_t *retval; 91 { 92 struct linux_sys_execve_args /* { 93 syscallarg(const char *) path; 94 syscallarg(char **) argv; 95 syscallarg(char **) envp; 96 } */ *uap = v; 97 struct proc *p = l->l_proc; 98 struct sys_execve_args ap; 99 caddr_t sg; 100 101 sg = stackgap_init(p, 0); 102 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 103 104 SCARG(&ap, path) = SCARG(uap, path); 105 SCARG(&ap, argp) = SCARG(uap, argp); 106 SCARG(&ap, envp) = SCARG(uap, envp); 107 108 return sys_execve(l, &ap, retval); 109 } 110 111 /* 112 * Emulation switch. 113 */ 114 115 struct uvm_object *emul_linux_object; 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 &emul_linux_object, 133 linux_setregs, 134 linux_e_proc_exec, 135 linux_e_proc_fork, 136 linux_e_proc_exit, 137 #ifdef __HAVE_SYSCALL_INTERN 138 linux_syscall_intern, 139 #else 140 #error Implement __HAVE_SYSCALL_INTERN for this platform 141 #endif 142 linux_sysctl, 143 NULL, 144 }; 145 146 static void 147 linux_e_proc_init(p, vmspace) 148 struct proc *p; 149 struct vmspace *vmspace; 150 { 151 if (!p->p_emuldata) { 152 /* allocate new Linux emuldata */ 153 MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata), 154 M_EMULDATA, M_WAITOK); 155 } 156 157 memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata)); 158 159 /* Set the process idea of the break to the real value */ 160 ((struct linux_emuldata*)(p->p_emuldata))->p_break = 161 vmspace->vm_daddr + ctob(vmspace->vm_dsize); 162 } 163 164 /* 165 * Allocate per-process structures. Called when executing Linux 166 * process. We can reuse the old emuldata - if it's not null, 167 * the executed process is of same emulation as original forked one. 168 */ 169 static void 170 linux_e_proc_exec(p, epp) 171 struct proc *p; 172 struct exec_package *epp; 173 { 174 /* exec, use our vmspace */ 175 linux_e_proc_init(p, p->p_vmspace); 176 } 177 178 /* 179 * Emulation per-process exit hook. 180 */ 181 static void 182 linux_e_proc_exit(p) 183 struct proc *p; 184 { 185 /* free Linux emuldata and set the pointer to null */ 186 FREE(p->p_emuldata, M_EMULDATA); 187 p->p_emuldata = NULL; 188 } 189 190 /* 191 * Emulation fork hook. 192 */ 193 static void 194 linux_e_proc_fork(p, parent) 195 struct proc *p, *parent; 196 { 197 /* 198 * It could be desirable to copy some stuff from parent's 199 * emuldata. We don't need anything like that for now. 200 * So just allocate new emuldata for the new process. 201 */ 202 p->p_emuldata = NULL; 203 204 /* fork, use parent's vmspace (our vmspace may not be setup yet) */ 205 linux_e_proc_init(p, parent->p_vmspace); 206 } 207