1 /* $NetBSD: linux_machdep.c,v 1.17 2005/12/11 12:20:14 christos 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/param.h> 40 41 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.17 2005/12/11 12:20:14 christos 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/sa.h> 62 #include <sys/syscallargs.h> 63 #include <sys/filedesc.h> 64 #include <sys/exec_elf.h> 65 #include <sys/disklabel.h> 66 #include <sys/ioctl.h> 67 #include <miscfs/specfs/specdev.h> 68 69 #include <compat/linux/common/linux_types.h> 70 #include <compat/linux/common/linux_signal.h> 71 #include <compat/linux/common/linux_util.h> 72 #include <compat/linux/common/linux_ioctl.h> 73 #include <compat/linux/common/linux_hdio.h> 74 #include <compat/linux/common/linux_exec.h> 75 #include <compat/linux/common/linux_machdep.h> 76 #include <compat/linux/linux_syscallargs.h> 77 78 void 79 linux_setregs(l, epp, stack) 80 struct lwp *l; 81 struct exec_package *epp; 82 u_long stack; 83 { 84 85 setregs(l, epp, stack); 86 } 87 88 void 89 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 90 { 91 struct lwp *l = curlwp; 92 struct proc *p = l->l_proc; 93 struct trapframe *tf; 94 struct linux_sigframe *fp, frame; 95 int onstack; 96 const int sig = ksi->ksi_signo; 97 sig_t catcher = SIGACTION(p, sig).sa_handler; 98 99 tf = process_frame(l); 100 101 /* 102 * The Linux version of this code is in 103 * linux/arch/arm/kernel/signal.c. 104 */ 105 106 /* Do we need to jump onto the signal stack? */ 107 onstack = 108 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 109 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 110 111 /* Allocate space for the signal handler context. */ 112 if (onstack) 113 fp = (struct linux_sigframe *)((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 114 p->p_sigctx.ps_sigstk.ss_size); 115 else 116 fp = (struct linux_sigframe *)tf->tf_usr_sp; 117 fp--; 118 119 /* Build stack frame for signal trampoline. */ 120 121 /* Save register context. */ 122 frame.sf_sc.sc_r0 = tf->tf_r0; 123 frame.sf_sc.sc_r1 = tf->tf_r1; 124 frame.sf_sc.sc_r2 = tf->tf_r2; 125 frame.sf_sc.sc_r3 = tf->tf_r3; 126 frame.sf_sc.sc_r4 = tf->tf_r4; 127 frame.sf_sc.sc_r5 = tf->tf_r5; 128 frame.sf_sc.sc_r6 = tf->tf_r6; 129 frame.sf_sc.sc_r7 = tf->tf_r7; 130 frame.sf_sc.sc_r8 = tf->tf_r8; 131 frame.sf_sc.sc_r9 = tf->tf_r9; 132 frame.sf_sc.sc_r10 = tf->tf_r10; 133 frame.sf_sc.sc_r11 = tf->tf_r11; 134 frame.sf_sc.sc_r12 = tf->tf_r12; 135 frame.sf_sc.sc_sp = tf->tf_usr_sp; 136 frame.sf_sc.sc_lr = tf->tf_usr_lr; 137 frame.sf_sc.sc_pc = tf->tf_pc; 138 frame.sf_sc.sc_cpsr = tf->tf_spsr; 139 140 /* Save signal stack. */ 141 /* Linux doesn't save the onstack flag in sigframe */ 142 143 /* Save signal mask. */ 144 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 145 frame.sf_extramask, mask); 146 147 /* Other state (mostly faked) */ 148 /* 149 * trapno should indicate the trap that caused the signal: 150 * 6 -> undefined instruction 151 * 11 -> address exception 152 * 14 -> data/prefetch abort 153 */ 154 frame.sf_sc.sc_trapno = 0; 155 frame.sf_sc.sc_error_code = 0; 156 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 157 158 if (copyout(&frame, fp, sizeof(frame)) != 0) { 159 /* 160 * Process has trashed its stack; give it an illegal 161 * instruction to halt it in its tracks. 162 */ 163 sigexit(l, SIGILL); 164 /* NOTREACHED */ 165 } 166 /* 167 * Build context to run handler in. 168 */ 169 tf->tf_r0 = native_to_linux_signo[sig]; 170 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 171 tf->tf_r2 = 0; 172 tf->tf_r3 = (register_t)catcher; 173 tf->tf_usr_sp = (register_t)fp; 174 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 175 176 /* Remember that we're now on the signal stack. */ 177 if (onstack) 178 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 179 180 } 181 182 #if 0 183 /* 184 * System call to cleanup state after a signal 185 * has been taken. Reset signal mask and 186 * stack state from context left by sendsig (above). 187 * Return to previous pc and psl as specified by 188 * context left by sendsig. Check carefully to 189 * make sure that the user has not modified the 190 * psl to gain improper privileges or to cause 191 * a machine fault. 192 */ 193 int 194 linux_sys_rt_sigreturn(p, v, retval) 195 struct proc *p; 196 void *v; 197 register_t *retval; 198 { 199 /* XXX XAX write me */ 200 return(ENOSYS); 201 } 202 #endif 203 204 int 205 linux_sys_sigreturn(l, v, retval) 206 struct lwp *l; 207 void *v; 208 register_t *retval; 209 { 210 struct linux_sigframe *sfp, frame; 211 struct proc *p = l->l_proc; 212 struct trapframe *tf; 213 sigset_t mask; 214 215 tf = process_frame(l); 216 217 /* 218 * The trampoline code hands us the context. 219 * It is unsafe to keep track of it ourselves, in the event that a 220 * program jumps out of a signal handler. 221 */ 222 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 223 if (copyin((caddr_t)sfp, &frame, sizeof(*sfp)) != 0) 224 return (EFAULT); 225 226 /* 227 * Make sure the processor mode has not been tampered with and 228 * interrupts have not been disabled. 229 */ 230 #ifdef __PROG32 231 if ((frame.sf_sc.sc_cpsr & PSR_MODE) != PSR_USR32_MODE || 232 (frame.sf_sc.sc_cpsr & (I32_bit | F32_bit)) != 0) 233 return (EINVAL); 234 #else /* __PROG26 */ 235 if ((frame.sf_sc.sc_pc & R15_MODE) != R15_MODE_USR || 236 (frame.sf_sc.sc_pc & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0) 237 return EINVAL; 238 #endif 239 240 /* Restore register context. */ 241 tf = process_frame(l); 242 tf->tf_r0 = frame.sf_sc.sc_r0; 243 tf->tf_r1 = frame.sf_sc.sc_r1; 244 tf->tf_r2 = frame.sf_sc.sc_r2; 245 tf->tf_r3 = frame.sf_sc.sc_r3; 246 tf->tf_r4 = frame.sf_sc.sc_r4; 247 tf->tf_r5 = frame.sf_sc.sc_r5; 248 tf->tf_r6 = frame.sf_sc.sc_r6; 249 tf->tf_r7 = frame.sf_sc.sc_r7; 250 tf->tf_r8 = frame.sf_sc.sc_r8; 251 tf->tf_r9 = frame.sf_sc.sc_r9; 252 tf->tf_r10 = frame.sf_sc.sc_r10; 253 tf->tf_r11 = frame.sf_sc.sc_r11; 254 tf->tf_r12 = frame.sf_sc.sc_r12; 255 tf->tf_usr_sp = frame.sf_sc.sc_sp; 256 tf->tf_usr_lr = frame.sf_sc.sc_lr; 257 tf->tf_pc = frame.sf_sc.sc_pc; 258 tf->tf_spsr = frame.sf_sc.sc_cpsr; 259 260 /* Restore signal stack. */ 261 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 262 263 /* Restore signal mask. */ 264 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 265 frame.sf_extramask); 266 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 267 268 return (EJUSTRETURN); 269 } 270 271 /* 272 * major device numbers remapping 273 */ 274 dev_t 275 linux_fakedev(dev, raw) 276 dev_t dev; 277 int raw; 278 { 279 /* XXX write me */ 280 return dev; 281 } 282 283 /* 284 * We come here in a last attempt to satisfy a Linux ioctl() call 285 */ 286 int 287 linux_machdepioctl(l, v, retval) 288 struct lwp *l; 289 void *v; 290 register_t *retval; 291 { 292 struct linux_sys_ioctl_args /* { 293 syscallarg(int) fd; 294 syscallarg(u_long) com; 295 syscallarg(caddr_t) data; 296 } */ *uap = v; 297 struct sys_ioctl_args bia; 298 u_long com; 299 300 SCARG(&bia, fd) = SCARG(uap, fd); 301 SCARG(&bia, data) = SCARG(uap, data); 302 com = SCARG(uap, com); 303 304 switch (com) { 305 default: 306 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 307 return EINVAL; 308 } 309 SCARG(&bia, com) = com; 310 311 return sys_ioctl(l, &bia, retval); 312 } 313 314 int 315 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 316 { 317 return 0; 318 } 319