1 /* $NetBSD: linux_machdep.c,v 1.31 2013/08/18 07:01:45 matt 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 1.31 2013/08/18 07:01:45 matt 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 59 #include <miscfs/specfs/specdev.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_ioctl.h> 65 #include <compat/linux/common/linux_hdio.h> 66 #include <compat/linux/common/linux_exec.h> 67 #include <compat/linux/common/linux_machdep.h> 68 #include <compat/linux/linux_syscallargs.h> 69 70 #include <arm/locore.h> 71 72 void 73 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 74 { 75 76 setregs(l, epp, stack); 77 } 78 79 void 80 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 81 { 82 struct lwp * const l = curlwp; 83 struct proc * const p = l->l_proc; 84 struct trapframe * const tf = lwp_trapframe(l); 85 struct linux_sigframe *fp, frame; 86 int onstack, error; 87 const int sig = ksi->ksi_signo; 88 sig_t catcher = SIGACTION(p, sig).sa_handler; 89 90 91 /* 92 * The Linux version of this code is in 93 * linux/arch/arm/kernel/signal.c. 94 */ 95 96 /* Do we need to jump onto the signal stack? */ 97 onstack = 98 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 99 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 100 101 /* Allocate space for the signal handler context. */ 102 if (onstack) 103 fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + 104 l->l_sigstk.ss_size); 105 else 106 fp = (struct linux_sigframe *)tf->tf_usr_sp; 107 fp--; 108 109 /* Build stack frame for signal trampoline. */ 110 111 /* Save register context. */ 112 frame.sf_sc.sc_r0 = tf->tf_r0; 113 frame.sf_sc.sc_r1 = tf->tf_r1; 114 frame.sf_sc.sc_r2 = tf->tf_r2; 115 frame.sf_sc.sc_r3 = tf->tf_r3; 116 frame.sf_sc.sc_r4 = tf->tf_r4; 117 frame.sf_sc.sc_r5 = tf->tf_r5; 118 frame.sf_sc.sc_r6 = tf->tf_r6; 119 frame.sf_sc.sc_r7 = tf->tf_r7; 120 frame.sf_sc.sc_r8 = tf->tf_r8; 121 frame.sf_sc.sc_r9 = tf->tf_r9; 122 frame.sf_sc.sc_r10 = tf->tf_r10; 123 frame.sf_sc.sc_r11 = tf->tf_r11; 124 frame.sf_sc.sc_r12 = tf->tf_r12; 125 frame.sf_sc.sc_sp = tf->tf_usr_sp; 126 frame.sf_sc.sc_lr = tf->tf_usr_lr; 127 frame.sf_sc.sc_pc = tf->tf_pc; 128 frame.sf_sc.sc_cpsr = tf->tf_spsr; 129 130 /* Save signal stack. */ 131 /* Linux doesn't save the onstack flag in sigframe */ 132 133 /* Save signal mask. */ 134 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 135 frame.sf_extramask, mask); 136 137 /* Other state (mostly faked) */ 138 /* 139 * trapno should indicate the trap that caused the signal: 140 * 6 -> undefined instruction 141 * 11 -> address exception 142 * 14 -> data/prefetch abort 143 */ 144 frame.sf_sc.sc_trapno = 0; 145 frame.sf_sc.sc_error_code = 0; 146 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 147 sendsig_reset(l, sig); 148 149 mutex_exit(p->p_lock); 150 error = copyout(&frame, fp, sizeof(frame)); 151 mutex_enter(p->p_lock); 152 153 if (error != 0) { 154 /* 155 * Process has trashed its stack; give it an illegal 156 * instruction to halt it in its tracks. 157 */ 158 sigexit(l, SIGILL); 159 /* NOTREACHED */ 160 } 161 /* 162 * Build context to run handler in. 163 */ 164 tf->tf_r0 = native_to_linux_signo[sig]; 165 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 166 tf->tf_r2 = 0; 167 tf->tf_r3 = (register_t)catcher; 168 tf->tf_usr_sp = (register_t)fp; 169 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 170 171 /* Remember that we're now on the signal stack. */ 172 if (onstack) 173 l->l_sigstk.ss_flags |= SS_ONSTACK; 174 175 } 176 177 #if 0 178 /* 179 * System call to cleanup state after a signal 180 * has been taken. Reset signal mask and 181 * stack state from context left by sendsig (above). 182 * Return to previous pc and psl as specified by 183 * context left by sendsig. Check carefully to 184 * make sure that the user has not modified the 185 * psl to gain improper privileges or to cause 186 * a machine fault. 187 */ 188 int 189 linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) 190 { 191 /* XXX XAX write me */ 192 return(ENOSYS); 193 } 194 #endif 195 196 int 197 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v, 198 register_t *retval) 199 { 200 struct trapframe * const tf = lwp_trapframe(l); 201 struct proc * const p = l->l_proc; 202 struct linux_sigframe *sfp, frame; 203 sigset_t mask; 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->tf_r0 = frame.sf_sc.sc_r0; 223 tf->tf_r1 = frame.sf_sc.sc_r1; 224 tf->tf_r2 = frame.sf_sc.sc_r2; 225 tf->tf_r3 = frame.sf_sc.sc_r3; 226 tf->tf_r4 = frame.sf_sc.sc_r4; 227 tf->tf_r5 = frame.sf_sc.sc_r5; 228 tf->tf_r6 = frame.sf_sc.sc_r6; 229 tf->tf_r7 = frame.sf_sc.sc_r7; 230 tf->tf_r8 = frame.sf_sc.sc_r8; 231 tf->tf_r9 = frame.sf_sc.sc_r9; 232 tf->tf_r10 = frame.sf_sc.sc_r10; 233 tf->tf_r11 = frame.sf_sc.sc_r11; 234 tf->tf_r12 = frame.sf_sc.sc_r12; 235 tf->tf_usr_sp = frame.sf_sc.sc_sp; 236 tf->tf_usr_lr = frame.sf_sc.sc_lr; 237 tf->tf_pc = frame.sf_sc.sc_pc; 238 tf->tf_spsr = frame.sf_sc.sc_cpsr; 239 240 mutex_enter(p->p_lock); 241 242 /* Restore signal stack. */ 243 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 244 245 /* Restore signal mask. */ 246 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 247 frame.sf_extramask); 248 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 249 250 mutex_exit(p->p_lock); 251 252 return (EJUSTRETURN); 253 } 254 255 /* 256 * major device numbers remapping 257 */ 258 dev_t 259 linux_fakedev(dev_t dev, int raw) 260 { 261 /* XXX write me */ 262 return dev; 263 } 264 265 /* 266 * We come here in a last attempt to satisfy a Linux ioctl() call 267 */ 268 int 269 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 270 { 271 /* { 272 syscallarg(int) fd; 273 syscallarg(u_long) com; 274 syscallarg(void *) data; 275 } */ 276 struct sys_ioctl_args bia; 277 u_long com; 278 279 SCARG(&bia, fd) = SCARG(uap, fd); 280 SCARG(&bia, data) = SCARG(uap, data); 281 com = SCARG(uap, com); 282 283 switch (com) { 284 default: 285 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 286 return EINVAL; 287 } 288 SCARG(&bia, com) = com; 289 290 return sys_ioctl(l, &bia, retval); 291 } 292 293 int 294 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 295 { 296 return 0; 297 } 298