linux_machdep.c revision 1.22
1 /* $NetBSD: linux_machdep.c,v 1.22 2007/03/26 22:44:40 hubertf 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 1.22 2007/03/26 22:44:40 hubertf 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(l, epp, stack) 79 struct lwp *l; 80 struct exec_package *epp; 81 u_long stack; 82 { 83 84 setregs(l, epp, stack); 85 } 86 87 void 88 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 89 { 90 struct lwp *l = curlwp; 91 struct proc *p = l->l_proc; 92 struct trapframe *tf; 93 struct linux_sigframe *fp, frame; 94 int onstack, error; 95 const int sig = ksi->ksi_signo; 96 sig_t catcher = SIGACTION(p, sig).sa_handler; 97 98 tf = process_frame(l); 99 100 /* 101 * The Linux version of this code is in 102 * linux/arch/arm/kernel/signal.c. 103 */ 104 105 /* Do we need to jump onto the signal stack? */ 106 onstack = 107 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 108 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 109 110 /* Allocate space for the signal handler context. */ 111 if (onstack) 112 fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + 113 l->l_sigstk.ss_size); 114 else 115 fp = (struct linux_sigframe *)tf->tf_usr_sp; 116 fp--; 117 118 /* Build stack frame for signal trampoline. */ 119 120 /* Save register context. */ 121 frame.sf_sc.sc_r0 = tf->tf_r0; 122 frame.sf_sc.sc_r1 = tf->tf_r1; 123 frame.sf_sc.sc_r2 = tf->tf_r2; 124 frame.sf_sc.sc_r3 = tf->tf_r3; 125 frame.sf_sc.sc_r4 = tf->tf_r4; 126 frame.sf_sc.sc_r5 = tf->tf_r5; 127 frame.sf_sc.sc_r6 = tf->tf_r6; 128 frame.sf_sc.sc_r7 = tf->tf_r7; 129 frame.sf_sc.sc_r8 = tf->tf_r8; 130 frame.sf_sc.sc_r9 = tf->tf_r9; 131 frame.sf_sc.sc_r10 = tf->tf_r10; 132 frame.sf_sc.sc_r11 = tf->tf_r11; 133 frame.sf_sc.sc_r12 = tf->tf_r12; 134 frame.sf_sc.sc_sp = tf->tf_usr_sp; 135 frame.sf_sc.sc_lr = tf->tf_usr_lr; 136 frame.sf_sc.sc_pc = tf->tf_pc; 137 frame.sf_sc.sc_cpsr = tf->tf_spsr; 138 139 /* Save signal stack. */ 140 /* Linux doesn't save the onstack flag in sigframe */ 141 142 /* Save signal mask. */ 143 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 144 frame.sf_extramask, mask); 145 146 /* Other state (mostly faked) */ 147 /* 148 * trapno should indicate the trap that caused the signal: 149 * 6 -> undefined instruction 150 * 11 -> address exception 151 * 14 -> data/prefetch abort 152 */ 153 frame.sf_sc.sc_trapno = 0; 154 frame.sf_sc.sc_error_code = 0; 155 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 156 sendsig_reset(l, sig); 157 158 mutex_exit(&p->p_smutex); 159 error = copyout(&frame, fp, sizeof(frame)); 160 mutex_enter(&p->p_smutex); 161 162 if (error != 0) { 163 /* 164 * Process has trashed its stack; give it an illegal 165 * instruction to halt it in its tracks. 166 */ 167 sigexit(l, SIGILL); 168 /* NOTREACHED */ 169 } 170 /* 171 * Build context to run handler in. 172 */ 173 tf->tf_r0 = native_to_linux_signo[sig]; 174 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 175 tf->tf_r2 = 0; 176 tf->tf_r3 = (register_t)catcher; 177 tf->tf_usr_sp = (register_t)fp; 178 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 179 180 /* Remember that we're now on the signal stack. */ 181 if (onstack) 182 l->l_sigstk.ss_flags |= SS_ONSTACK; 183 184 } 185 186 #if 0 187 /* 188 * System call to cleanup state after a signal 189 * has been taken. Reset signal mask and 190 * stack state from context left by sendsig (above). 191 * Return to previous pc and psl as specified by 192 * context left by sendsig. Check carefully to 193 * make sure that the user has not modified the 194 * psl to gain improper privileges or to cause 195 * a machine fault. 196 */ 197 int 198 linux_sys_rt_sigreturn(p, v, retval) 199 struct proc *p; 200 void *v; 201 register_t *retval; 202 { 203 /* XXX XAX write me */ 204 return(ENOSYS); 205 } 206 #endif 207 208 int 209 linux_sys_sigreturn(l, v, retval) 210 struct lwp *l; 211 void *v; 212 register_t *retval; 213 { 214 struct linux_sigframe *sfp, frame; 215 struct proc *p = l->l_proc; 216 struct trapframe *tf; 217 sigset_t mask; 218 219 tf = process_frame(l); 220 221 /* 222 * The trampoline code hands us the context. 223 * It is unsafe to keep track of it ourselves, in the event that a 224 * program jumps out of a signal handler. 225 */ 226 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 227 if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0) 228 return (EFAULT); 229 230 /* 231 * Make sure the processor mode has not been tampered with and 232 * interrupts have not been disabled. 233 */ 234 if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr)) 235 return EINVAL; 236 237 /* Restore register context. */ 238 tf = process_frame(l); 239 tf->tf_r0 = frame.sf_sc.sc_r0; 240 tf->tf_r1 = frame.sf_sc.sc_r1; 241 tf->tf_r2 = frame.sf_sc.sc_r2; 242 tf->tf_r3 = frame.sf_sc.sc_r3; 243 tf->tf_r4 = frame.sf_sc.sc_r4; 244 tf->tf_r5 = frame.sf_sc.sc_r5; 245 tf->tf_r6 = frame.sf_sc.sc_r6; 246 tf->tf_r7 = frame.sf_sc.sc_r7; 247 tf->tf_r8 = frame.sf_sc.sc_r8; 248 tf->tf_r9 = frame.sf_sc.sc_r9; 249 tf->tf_r10 = frame.sf_sc.sc_r10; 250 tf->tf_r11 = frame.sf_sc.sc_r11; 251 tf->tf_r12 = frame.sf_sc.sc_r12; 252 tf->tf_usr_sp = frame.sf_sc.sc_sp; 253 tf->tf_usr_lr = frame.sf_sc.sc_lr; 254 tf->tf_pc = frame.sf_sc.sc_pc; 255 tf->tf_spsr = frame.sf_sc.sc_cpsr; 256 257 mutex_enter(&p->p_smutex); 258 259 /* Restore signal stack. */ 260 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 261 262 /* Restore signal mask. */ 263 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 264 frame.sf_extramask); 265 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 266 267 mutex_exit(&p->p_smutex); 268 269 return (EJUSTRETURN); 270 } 271 272 /* 273 * major device numbers remapping 274 */ 275 dev_t 276 linux_fakedev(dev, raw) 277 dev_t dev; 278 int raw; 279 { 280 /* XXX write me */ 281 return dev; 282 } 283 284 /* 285 * We come here in a last attempt to satisfy a Linux ioctl() call 286 */ 287 int 288 linux_machdepioctl(l, v, retval) 289 struct lwp *l; 290 void *v; 291 register_t *retval; 292 { 293 struct linux_sys_ioctl_args /* { 294 syscallarg(int) fd; 295 syscallarg(u_long) com; 296 syscallarg(void *) data; 297 } */ *uap = v; 298 struct sys_ioctl_args bia; 299 u_long com; 300 301 SCARG(&bia, fd) = SCARG(uap, fd); 302 SCARG(&bia, data) = SCARG(uap, data); 303 com = SCARG(uap, com); 304 305 switch (com) { 306 default: 307 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 308 return EINVAL; 309 } 310 SCARG(&bia, com) = com; 311 312 return sys_ioctl(l, &bia, retval); 313 } 314 315 int 316 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 317 { 318 return 0; 319 } 320
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