1 /* $NetBSD: linux_machdep.c,v 1.23 2007/12/08 18:36:05 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 41 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.23 2007/12/08 18:36:05 dsl Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/signalvar.h> 46 #include <sys/kernel.h> 47 #include <sys/proc.h> 48 #include <sys/user.h> 49 #include <sys/buf.h> 50 #include <sys/reboot.h> 51 #include <sys/conf.h> 52 #include <sys/exec.h> 53 #include <sys/file.h> 54 #include <sys/callout.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/msgbuf.h> 58 #include <sys/mount.h> 59 #include <sys/vnode.h> 60 #include <sys/device.h> 61 #include <sys/syscallargs.h> 62 #include <sys/filedesc.h> 63 #include <sys/exec_elf.h> 64 #include <sys/disklabel.h> 65 #include <sys/ioctl.h> 66 #include <miscfs/specfs/specdev.h> 67 68 #include <compat/linux/common/linux_types.h> 69 #include <compat/linux/common/linux_signal.h> 70 #include <compat/linux/common/linux_util.h> 71 #include <compat/linux/common/linux_ioctl.h> 72 #include <compat/linux/common/linux_hdio.h> 73 #include <compat/linux/common/linux_exec.h> 74 #include <compat/linux/common/linux_machdep.h> 75 #include <compat/linux/linux_syscallargs.h> 76 77 void 78 linux_setregs(struct lwp *l, struct exec_package *epp, u_long stack) 79 { 80 81 setregs(l, epp, stack); 82 } 83 84 void 85 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 86 { 87 struct lwp *l = curlwp; 88 struct proc *p = l->l_proc; 89 struct trapframe *tf; 90 struct linux_sigframe *fp, frame; 91 int onstack, error; 92 const int sig = ksi->ksi_signo; 93 sig_t catcher = SIGACTION(p, sig).sa_handler; 94 95 tf = process_frame(l); 96 97 /* 98 * The Linux version of this code is in 99 * linux/arch/arm/kernel/signal.c. 100 */ 101 102 /* Do we need to jump onto the signal stack? */ 103 onstack = 104 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 105 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 106 107 /* Allocate space for the signal handler context. */ 108 if (onstack) 109 fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + 110 l->l_sigstk.ss_size); 111 else 112 fp = (struct linux_sigframe *)tf->tf_usr_sp; 113 fp--; 114 115 /* Build stack frame for signal trampoline. */ 116 117 /* Save register context. */ 118 frame.sf_sc.sc_r0 = tf->tf_r0; 119 frame.sf_sc.sc_r1 = tf->tf_r1; 120 frame.sf_sc.sc_r2 = tf->tf_r2; 121 frame.sf_sc.sc_r3 = tf->tf_r3; 122 frame.sf_sc.sc_r4 = tf->tf_r4; 123 frame.sf_sc.sc_r5 = tf->tf_r5; 124 frame.sf_sc.sc_r6 = tf->tf_r6; 125 frame.sf_sc.sc_r7 = tf->tf_r7; 126 frame.sf_sc.sc_r8 = tf->tf_r8; 127 frame.sf_sc.sc_r9 = tf->tf_r9; 128 frame.sf_sc.sc_r10 = tf->tf_r10; 129 frame.sf_sc.sc_r11 = tf->tf_r11; 130 frame.sf_sc.sc_r12 = tf->tf_r12; 131 frame.sf_sc.sc_sp = tf->tf_usr_sp; 132 frame.sf_sc.sc_lr = tf->tf_usr_lr; 133 frame.sf_sc.sc_pc = tf->tf_pc; 134 frame.sf_sc.sc_cpsr = tf->tf_spsr; 135 136 /* Save signal stack. */ 137 /* Linux doesn't save the onstack flag in sigframe */ 138 139 /* Save signal mask. */ 140 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 141 frame.sf_extramask, mask); 142 143 /* Other state (mostly faked) */ 144 /* 145 * trapno should indicate the trap that caused the signal: 146 * 6 -> undefined instruction 147 * 11 -> address exception 148 * 14 -> data/prefetch abort 149 */ 150 frame.sf_sc.sc_trapno = 0; 151 frame.sf_sc.sc_error_code = 0; 152 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 153 sendsig_reset(l, sig); 154 155 mutex_exit(&p->p_smutex); 156 error = copyout(&frame, fp, sizeof(frame)); 157 mutex_enter(&p->p_smutex); 158 159 if (error != 0) { 160 /* 161 * Process has trashed its stack; give it an illegal 162 * instruction to halt it in its tracks. 163 */ 164 sigexit(l, SIGILL); 165 /* NOTREACHED */ 166 } 167 /* 168 * Build context to run handler in. 169 */ 170 tf->tf_r0 = native_to_linux_signo[sig]; 171 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 172 tf->tf_r2 = 0; 173 tf->tf_r3 = (register_t)catcher; 174 tf->tf_usr_sp = (register_t)fp; 175 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 176 177 /* Remember that we're now on the signal stack. */ 178 if (onstack) 179 l->l_sigstk.ss_flags |= SS_ONSTACK; 180 181 } 182 183 #if 0 184 /* 185 * System call to cleanup state after a signal 186 * has been taken. Reset signal mask and 187 * stack state from context left by sendsig (above). 188 * Return to previous pc and psl as specified by 189 * context left by sendsig. Check carefully to 190 * make sure that the user has not modified the 191 * psl to gain improper privileges or to cause 192 * a machine fault. 193 */ 194 int 195 linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) 196 { 197 /* XXX XAX write me */ 198 return(ENOSYS); 199 } 200 #endif 201 202 int 203 linux_sys_sigreturn(struct lwp *l, void *v, register_t *retval) 204 { 205 struct linux_sigframe *sfp, frame; 206 struct proc *p = l->l_proc; 207 struct trapframe *tf; 208 sigset_t mask; 209 210 tf = process_frame(l); 211 212 /* 213 * The trampoline code hands us the context. 214 * It is unsafe to keep track of it ourselves, in the event that a 215 * program jumps out of a signal handler. 216 */ 217 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 218 if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0) 219 return (EFAULT); 220 221 /* 222 * Make sure the processor mode has not been tampered with and 223 * interrupts have not been disabled. 224 */ 225 if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr)) 226 return EINVAL; 227 228 /* Restore register context. */ 229 tf = process_frame(l); 230 tf->tf_r0 = frame.sf_sc.sc_r0; 231 tf->tf_r1 = frame.sf_sc.sc_r1; 232 tf->tf_r2 = frame.sf_sc.sc_r2; 233 tf->tf_r3 = frame.sf_sc.sc_r3; 234 tf->tf_r4 = frame.sf_sc.sc_r4; 235 tf->tf_r5 = frame.sf_sc.sc_r5; 236 tf->tf_r6 = frame.sf_sc.sc_r6; 237 tf->tf_r7 = frame.sf_sc.sc_r7; 238 tf->tf_r8 = frame.sf_sc.sc_r8; 239 tf->tf_r9 = frame.sf_sc.sc_r9; 240 tf->tf_r10 = frame.sf_sc.sc_r10; 241 tf->tf_r11 = frame.sf_sc.sc_r11; 242 tf->tf_r12 = frame.sf_sc.sc_r12; 243 tf->tf_usr_sp = frame.sf_sc.sc_sp; 244 tf->tf_usr_lr = frame.sf_sc.sc_lr; 245 tf->tf_pc = frame.sf_sc.sc_pc; 246 tf->tf_spsr = frame.sf_sc.sc_cpsr; 247 248 mutex_enter(&p->p_smutex); 249 250 /* Restore signal stack. */ 251 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 252 253 /* Restore signal mask. */ 254 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 255 frame.sf_extramask); 256 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 257 258 mutex_exit(&p->p_smutex); 259 260 return (EJUSTRETURN); 261 } 262 263 /* 264 * major device numbers remapping 265 */ 266 dev_t 267 linux_fakedev(dev_t dev, int raw) 268 { 269 /* XXX write me */ 270 return dev; 271 } 272 273 /* 274 * We come here in a last attempt to satisfy a Linux ioctl() call 275 */ 276 int 277 linux_machdepioctl(struct lwp *l, void *v, register_t *retval) 278 { 279 struct linux_sys_ioctl_args /* { 280 syscallarg(int) fd; 281 syscallarg(u_long) com; 282 syscallarg(void *) data; 283 } */ *uap = v; 284 struct sys_ioctl_args bia; 285 u_long com; 286 287 SCARG(&bia, fd) = SCARG(uap, fd); 288 SCARG(&bia, data) = SCARG(uap, data); 289 com = SCARG(uap, com); 290 291 switch (com) { 292 default: 293 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 294 return EINVAL; 295 } 296 SCARG(&bia, com) = com; 297 298 return sys_ioctl(l, &bia, retval); 299 } 300 301 int 302 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 303 { 304 return 0; 305 } 306