linux_machdep.c revision 1.29
1/* $NetBSD: linux_machdep.c,v 1.29 2010/07/07 01:30:33 chs 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33 34__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.29 2010/07/07 01:30:33 chs Exp $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/signalvar.h> 39#include <sys/kernel.h> 40#include <sys/proc.h> 41#include <sys/buf.h> 42#include <sys/reboot.h> 43#include <sys/conf.h> 44#include <sys/exec.h> 45#include <sys/file.h> 46#include <sys/callout.h> 47#include <sys/malloc.h> 48#include <sys/mbuf.h> 49#include <sys/msgbuf.h> 50#include <sys/mount.h> 51#include <sys/vnode.h> 52#include <sys/device.h> 53#include <sys/syscallargs.h> 54#include <sys/filedesc.h> 55#include <sys/exec_elf.h> 56#include <sys/disklabel.h> 57#include <sys/ioctl.h> 58#include <miscfs/specfs/specdev.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_ioctl.h> 64#include <compat/linux/common/linux_hdio.h> 65#include <compat/linux/common/linux_exec.h> 66#include <compat/linux/common/linux_machdep.h> 67#include <compat/linux/linux_syscallargs.h> 68 69void 70linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 71{ 72 73 setregs(l, epp, stack); 74} 75 76void 77linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 78{ 79 struct lwp *l = curlwp; 80 struct proc *p = l->l_proc; 81 struct trapframe *tf; 82 struct linux_sigframe *fp, frame; 83 int onstack, error; 84 const int sig = ksi->ksi_signo; 85 sig_t catcher = SIGACTION(p, sig).sa_handler; 86 87 tf = process_frame(l); 88 89 /* 90 * The Linux version of this code is in 91 * linux/arch/arm/kernel/signal.c. 92 */ 93 94 /* Do we need to jump onto the signal stack? */ 95 onstack = 96 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 97 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 98 99 /* Allocate space for the signal handler context. */ 100 if (onstack) 101 fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + 102 l->l_sigstk.ss_size); 103 else 104 fp = (struct linux_sigframe *)tf->tf_usr_sp; 105 fp--; 106 107 /* Build stack frame for signal trampoline. */ 108 109 /* Save register context. */ 110 frame.sf_sc.sc_r0 = tf->tf_r0; 111 frame.sf_sc.sc_r1 = tf->tf_r1; 112 frame.sf_sc.sc_r2 = tf->tf_r2; 113 frame.sf_sc.sc_r3 = tf->tf_r3; 114 frame.sf_sc.sc_r4 = tf->tf_r4; 115 frame.sf_sc.sc_r5 = tf->tf_r5; 116 frame.sf_sc.sc_r6 = tf->tf_r6; 117 frame.sf_sc.sc_r7 = tf->tf_r7; 118 frame.sf_sc.sc_r8 = tf->tf_r8; 119 frame.sf_sc.sc_r9 = tf->tf_r9; 120 frame.sf_sc.sc_r10 = tf->tf_r10; 121 frame.sf_sc.sc_r11 = tf->tf_r11; 122 frame.sf_sc.sc_r12 = tf->tf_r12; 123 frame.sf_sc.sc_sp = tf->tf_usr_sp; 124 frame.sf_sc.sc_lr = tf->tf_usr_lr; 125 frame.sf_sc.sc_pc = tf->tf_pc; 126 frame.sf_sc.sc_cpsr = tf->tf_spsr; 127 128 /* Save signal stack. */ 129 /* Linux doesn't save the onstack flag in sigframe */ 130 131 /* Save signal mask. */ 132 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 133 frame.sf_extramask, mask); 134 135 /* Other state (mostly faked) */ 136 /* 137 * trapno should indicate the trap that caused the signal: 138 * 6 -> undefined instruction 139 * 11 -> address exception 140 * 14 -> data/prefetch abort 141 */ 142 frame.sf_sc.sc_trapno = 0; 143 frame.sf_sc.sc_error_code = 0; 144 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 145 sendsig_reset(l, sig); 146 147 mutex_exit(p->p_lock); 148 error = copyout(&frame, fp, sizeof(frame)); 149 mutex_enter(p->p_lock); 150 151 if (error != 0) { 152 /* 153 * Process has trashed its stack; give it an illegal 154 * instruction to halt it in its tracks. 155 */ 156 sigexit(l, SIGILL); 157 /* NOTREACHED */ 158 } 159 /* 160 * Build context to run handler in. 161 */ 162 tf->tf_r0 = native_to_linux_signo[sig]; 163 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 164 tf->tf_r2 = 0; 165 tf->tf_r3 = (register_t)catcher; 166 tf->tf_usr_sp = (register_t)fp; 167 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 168 169 /* Remember that we're now on the signal stack. */ 170 if (onstack) 171 l->l_sigstk.ss_flags |= SS_ONSTACK; 172 173} 174 175#if 0 176/* 177 * System call to cleanup state after a signal 178 * has been taken. Reset signal mask and 179 * stack state from context left by sendsig (above). 180 * Return to previous pc and psl as specified by 181 * context left by sendsig. Check carefully to 182 * make sure that the user has not modified the 183 * psl to gain improper privileges or to cause 184 * a machine fault. 185 */ 186int 187linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) 188{ 189 /* XXX XAX write me */ 190 return(ENOSYS); 191} 192#endif 193 194int 195linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v, 196 register_t *retval) 197{ 198 struct linux_sigframe *sfp, frame; 199 struct proc *p = l->l_proc; 200 struct trapframe *tf; 201 sigset_t mask; 202 203 tf = process_frame(l); 204 205 /* 206 * The trampoline code hands us the context. 207 * It is unsafe to keep track of it ourselves, in the event that a 208 * program jumps out of a signal handler. 209 */ 210 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 211 if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0) 212 return (EFAULT); 213 214 /* 215 * Make sure the processor mode has not been tampered with and 216 * interrupts have not been disabled. 217 */ 218 if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr)) 219 return EINVAL; 220 221 /* Restore register context. */ 222 tf = process_frame(l); 223 tf->tf_r0 = frame.sf_sc.sc_r0; 224 tf->tf_r1 = frame.sf_sc.sc_r1; 225 tf->tf_r2 = frame.sf_sc.sc_r2; 226 tf->tf_r3 = frame.sf_sc.sc_r3; 227 tf->tf_r4 = frame.sf_sc.sc_r4; 228 tf->tf_r5 = frame.sf_sc.sc_r5; 229 tf->tf_r6 = frame.sf_sc.sc_r6; 230 tf->tf_r7 = frame.sf_sc.sc_r7; 231 tf->tf_r8 = frame.sf_sc.sc_r8; 232 tf->tf_r9 = frame.sf_sc.sc_r9; 233 tf->tf_r10 = frame.sf_sc.sc_r10; 234 tf->tf_r11 = frame.sf_sc.sc_r11; 235 tf->tf_r12 = frame.sf_sc.sc_r12; 236 tf->tf_usr_sp = frame.sf_sc.sc_sp; 237 tf->tf_usr_lr = frame.sf_sc.sc_lr; 238 tf->tf_pc = frame.sf_sc.sc_pc; 239 tf->tf_spsr = frame.sf_sc.sc_cpsr; 240 241 mutex_enter(p->p_lock); 242 243 /* Restore signal stack. */ 244 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 245 246 /* Restore signal mask. */ 247 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 248 frame.sf_extramask); 249 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 250 251 mutex_exit(p->p_lock); 252 253 return (EJUSTRETURN); 254} 255 256/* 257 * major device numbers remapping 258 */ 259dev_t 260linux_fakedev(dev_t dev, int raw) 261{ 262 /* XXX write me */ 263 return dev; 264} 265 266/* 267 * We come here in a last attempt to satisfy a Linux ioctl() call 268 */ 269int 270linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 271{ 272 /* { 273 syscallarg(int) fd; 274 syscallarg(u_long) com; 275 syscallarg(void *) data; 276 } */ 277 struct sys_ioctl_args bia; 278 u_long com; 279 280 SCARG(&bia, fd) = SCARG(uap, fd); 281 SCARG(&bia, data) = SCARG(uap, data); 282 com = SCARG(uap, com); 283 284 switch (com) { 285 default: 286 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 287 return EINVAL; 288 } 289 SCARG(&bia, com) = com; 290 291 return sys_ioctl(l, &bia, retval); 292} 293 294int 295linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 296{ 297 return 0; 298} 299