1 /* $NetBSD: linux_machdep.c,v 1.10 2002/09/25 22:21:34 thorpej 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 1.10 2002/09/25 22:21:34 thorpej 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 76 #include <compat/linux/linux_syscallargs.h> 77 78 void 79 linux_setregs(p, epp, stack) 80 struct proc *p; 81 struct exec_package *epp; 82 u_long stack; 83 { 84 /* struct pcb *pcb = &p->p_addr->u_pcb; */ 85 86 setregs(p, epp, stack); 87 } 88 89 static __inline struct trapframe * 90 process_frame(struct proc *p) 91 { 92 93 return p->p_addr->u_pcb.pcb_tf; 94 } 95 96 void 97 linux_sendsig(sig, mask, code) 98 int sig; 99 sigset_t *mask; 100 u_long code; 101 { 102 struct proc *p = curproc; 103 struct trapframe *tf; 104 struct linux_sigframe *fp, frame; 105 int onstack; 106 sig_t catcher = SIGACTION(p, sig).sa_handler; 107 108 tf = process_frame(p); 109 110 /* 111 * The Linux version of this code is in 112 * linux/arch/arm/kernel/signal.c. 113 */ 114 115 /* Do we need to jump onto the signal stack? */ 116 onstack = 117 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 118 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 119 120 /* Allocate space for the signal handler context. */ 121 if (onstack) 122 fp = (struct linux_sigframe *)((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 123 p->p_sigctx.ps_sigstk.ss_size); 124 else 125 fp = (struct linux_sigframe *)tf->tf_usr_sp; 126 fp--; 127 128 /* Build stack frame for signal trampoline. */ 129 130 /* Save register context. */ 131 frame.sf_sc.sc_r0 = tf->tf_r0; 132 frame.sf_sc.sc_r1 = tf->tf_r1; 133 frame.sf_sc.sc_r2 = tf->tf_r2; 134 frame.sf_sc.sc_r3 = tf->tf_r3; 135 frame.sf_sc.sc_r4 = tf->tf_r4; 136 frame.sf_sc.sc_r5 = tf->tf_r5; 137 frame.sf_sc.sc_r6 = tf->tf_r6; 138 frame.sf_sc.sc_r7 = tf->tf_r7; 139 frame.sf_sc.sc_r8 = tf->tf_r8; 140 frame.sf_sc.sc_r9 = tf->tf_r9; 141 frame.sf_sc.sc_r10 = tf->tf_r10; 142 frame.sf_sc.sc_r11 = tf->tf_r11; 143 frame.sf_sc.sc_r12 = tf->tf_r12; 144 frame.sf_sc.sc_sp = tf->tf_usr_sp; 145 frame.sf_sc.sc_lr = tf->tf_usr_lr; 146 frame.sf_sc.sc_pc = tf->tf_pc; 147 frame.sf_sc.sc_cpsr = tf->tf_spsr; 148 149 /* Save signal stack. */ 150 /* Linux doesn't save the onstack flag in sigframe */ 151 152 /* Save signal mask. */ 153 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 154 frame.sf_extramask, mask); 155 156 /* Other state (mostly faked) */ 157 /* 158 * trapno should indicate the trap that caused the signal: 159 * 6 -> undefined instruction 160 * 11 -> address exception 161 * 14 -> data/prefetch abort 162 */ 163 frame.sf_sc.sc_trapno = 0; 164 frame.sf_sc.sc_error_code = 0; 165 frame.sf_sc.sc_fault_address = code; 166 167 if (copyout(&frame, fp, sizeof(frame)) != 0) { 168 /* 169 * Process has trashed its stack; give it an illegal 170 * instruction to halt it in its tracks. 171 */ 172 sigexit(p, SIGILL); 173 /* NOTREACHED */ 174 } 175 /* 176 * Build context to run handler in. 177 */ 178 tf->tf_r0 = native_to_linux_signo[sig]; 179 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 180 tf->tf_r2 = 0; 181 tf->tf_r3 = (register_t)catcher; 182 tf->tf_usr_sp = (register_t)fp; 183 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 184 185 /* Remember that we're now on the signal stack. */ 186 if (onstack) 187 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 188 189 } 190 191 #if 0 192 /* 193 * System call to cleanup state after a signal 194 * has been taken. Reset signal mask and 195 * stack state from context left by sendsig (above). 196 * Return to previous pc and psl as specified by 197 * context left by sendsig. Check carefully to 198 * make sure that the user has not modified the 199 * psl to gain improper privileges or to cause 200 * a machine fault. 201 */ 202 int 203 linux_sys_rt_sigreturn(p, v, retval) 204 struct proc *p; 205 void *v; 206 register_t *retval; 207 { 208 /* XXX XAX write me */ 209 return(ENOSYS); 210 } 211 #endif 212 213 int 214 linux_sys_sigreturn(p, v, retval) 215 struct proc *p; 216 void *v; 217 register_t *retval; 218 { 219 struct linux_sigframe *sfp, frame; 220 struct trapframe *tf; 221 sigset_t mask; 222 223 tf = process_frame(p); 224 225 /* 226 * The trampoline code hands us the context. 227 * It is unsafe to keep track of it ourselves, in the event that a 228 * program jumps out of a signal handler. 229 */ 230 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 231 if (copyin((caddr_t)sfp, &frame, sizeof(*sfp)) != 0) 232 return (EFAULT); 233 234 /* 235 * Make sure the processor mode has not been tampered with and 236 * interrupts have not been disabled. 237 */ 238 #ifdef __PROG32 239 if ((frame.sf_sc.sc_cpsr & PSR_MODE) != PSR_USR32_MODE || 240 (frame.sf_sc.sc_cpsr & (I32_bit | F32_bit)) != 0) 241 return (EINVAL); 242 #else /* __PROG26 */ 243 if ((frame.sf_sc.sc_pc & R15_MODE) != R15_MODE_USR || 244 (frame.sf_sc.sc_pc & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0) 245 return EINVAL; 246 #endif 247 248 /* Restore register context. */ 249 tf = process_frame(p); 250 tf->tf_r0 = frame.sf_sc.sc_r0; 251 tf->tf_r1 = frame.sf_sc.sc_r1; 252 tf->tf_r2 = frame.sf_sc.sc_r2; 253 tf->tf_r3 = frame.sf_sc.sc_r3; 254 tf->tf_r4 = frame.sf_sc.sc_r4; 255 tf->tf_r5 = frame.sf_sc.sc_r5; 256 tf->tf_r6 = frame.sf_sc.sc_r6; 257 tf->tf_r7 = frame.sf_sc.sc_r7; 258 tf->tf_r8 = frame.sf_sc.sc_r8; 259 tf->tf_r9 = frame.sf_sc.sc_r9; 260 tf->tf_r10 = frame.sf_sc.sc_r10; 261 tf->tf_r11 = frame.sf_sc.sc_r11; 262 tf->tf_r12 = frame.sf_sc.sc_r12; 263 tf->tf_usr_sp = frame.sf_sc.sc_sp; 264 tf->tf_usr_lr = frame.sf_sc.sc_lr; 265 tf->tf_pc = frame.sf_sc.sc_pc; 266 tf->tf_spsr = frame.sf_sc.sc_cpsr; 267 268 /* Restore signal stack. */ 269 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 270 271 /* Restore signal mask. */ 272 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 273 frame.sf_extramask); 274 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 275 276 return (EJUSTRETURN); 277 } 278 279 /* 280 * major device numbers remapping 281 */ 282 dev_t 283 linux_fakedev(dev, raw) 284 dev_t dev; 285 int raw; 286 { 287 /* XXX write me */ 288 return dev; 289 } 290 291 /* 292 * We come here in a last attempt to satisfy a Linux ioctl() call 293 */ 294 int 295 linux_machdepioctl(p, v, retval) 296 struct proc *p; 297 void *v; 298 register_t *retval; 299 { 300 struct linux_sys_ioctl_args /* { 301 syscallarg(int) fd; 302 syscallarg(u_long) com; 303 syscallarg(caddr_t) data; 304 } */ *uap = v; 305 struct sys_ioctl_args bia; 306 u_long com; 307 308 SCARG(&bia, fd) = SCARG(uap, fd); 309 SCARG(&bia, data) = SCARG(uap, data); 310 com = SCARG(uap, com); 311 312 switch (com) { 313 default: 314 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 315 return EINVAL; 316 } 317 SCARG(&bia, com) = com; 318 return sys_ioctl(p, &bia, retval); 319 } 320