linux_machdep.c revision 1.12
1/* $NetBSD: linux_machdep.c,v 1.12 2003/09/26 12:02:57 simonb 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 1.12 2003/09/26 12:02:57 simonb 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 77#include <compat/linux/linux_syscallargs.h> 78 79void 80linux_setregs(l, epp, stack) 81 struct lwp *l; 82 struct exec_package *epp; 83 u_long stack; 84{ 85 86 setregs(l, epp, stack); 87} 88 89static __inline struct trapframe * 90process_frame(struct lwp *l) 91{ 92 93 return l->l_addr->u_pcb.pcb_tf; 94} 95 96void 97linux_sendsig(sig, mask, code) 98 int sig; 99 const sigset_t *mask; 100 u_long code; 101{ 102 struct lwp *l = curlwp; 103 struct proc *p = l->l_proc; 104 struct trapframe *tf; 105 struct linux_sigframe *fp, frame; 106 int onstack; 107 sig_t catcher = SIGACTION(p, sig).sa_handler; 108 109 tf = process_frame(l); 110 111 /* 112 * The Linux version of this code is in 113 * linux/arch/arm/kernel/signal.c. 114 */ 115 116 /* Do we need to jump onto the signal stack? */ 117 onstack = 118 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 119 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 120 121 /* Allocate space for the signal handler context. */ 122 if (onstack) 123 fp = (struct linux_sigframe *)((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 124 p->p_sigctx.ps_sigstk.ss_size); 125 else 126 fp = (struct linux_sigframe *)tf->tf_usr_sp; 127 fp--; 128 129 /* Build stack frame for signal trampoline. */ 130 131 /* Save register context. */ 132 frame.sf_sc.sc_r0 = tf->tf_r0; 133 frame.sf_sc.sc_r1 = tf->tf_r1; 134 frame.sf_sc.sc_r2 = tf->tf_r2; 135 frame.sf_sc.sc_r3 = tf->tf_r3; 136 frame.sf_sc.sc_r4 = tf->tf_r4; 137 frame.sf_sc.sc_r5 = tf->tf_r5; 138 frame.sf_sc.sc_r6 = tf->tf_r6; 139 frame.sf_sc.sc_r7 = tf->tf_r7; 140 frame.sf_sc.sc_r8 = tf->tf_r8; 141 frame.sf_sc.sc_r9 = tf->tf_r9; 142 frame.sf_sc.sc_r10 = tf->tf_r10; 143 frame.sf_sc.sc_r11 = tf->tf_r11; 144 frame.sf_sc.sc_r12 = tf->tf_r12; 145 frame.sf_sc.sc_sp = tf->tf_usr_sp; 146 frame.sf_sc.sc_lr = tf->tf_usr_lr; 147 frame.sf_sc.sc_pc = tf->tf_pc; 148 frame.sf_sc.sc_cpsr = tf->tf_spsr; 149 150 /* Save signal stack. */ 151 /* Linux doesn't save the onstack flag in sigframe */ 152 153 /* Save signal mask. */ 154 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 155 frame.sf_extramask, mask); 156 157 /* Other state (mostly faked) */ 158 /* 159 * trapno should indicate the trap that caused the signal: 160 * 6 -> undefined instruction 161 * 11 -> address exception 162 * 14 -> data/prefetch abort 163 */ 164 frame.sf_sc.sc_trapno = 0; 165 frame.sf_sc.sc_error_code = 0; 166 frame.sf_sc.sc_fault_address = code; 167 168 if (copyout(&frame, fp, sizeof(frame)) != 0) { 169 /* 170 * Process has trashed its stack; give it an illegal 171 * instruction to halt it in its tracks. 172 */ 173 sigexit(l, SIGILL); 174 /* NOTREACHED */ 175 } 176 /* 177 * Build context to run handler in. 178 */ 179 tf->tf_r0 = native_to_linux_signo[sig]; 180 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 181 tf->tf_r2 = 0; 182 tf->tf_r3 = (register_t)catcher; 183 tf->tf_usr_sp = (register_t)fp; 184 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 185 186 /* Remember that we're now on the signal stack. */ 187 if (onstack) 188 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 189 190} 191 192#if 0 193/* 194 * System call to cleanup state after a signal 195 * has been taken. Reset signal mask and 196 * stack state from context left by sendsig (above). 197 * Return to previous pc and psl as specified by 198 * context left by sendsig. Check carefully to 199 * make sure that the user has not modified the 200 * psl to gain improper privileges or to cause 201 * a machine fault. 202 */ 203int 204linux_sys_rt_sigreturn(p, v, retval) 205 struct proc *p; 206 void *v; 207 register_t *retval; 208{ 209 /* XXX XAX write me */ 210 return(ENOSYS); 211} 212#endif 213 214int 215linux_sys_sigreturn(l, v, retval) 216 struct lwp *l; 217 void *v; 218 register_t *retval; 219{ 220 struct linux_sigframe *sfp, frame; 221 struct proc *p = l->l_proc; 222 struct trapframe *tf; 223 sigset_t mask; 224 225 tf = process_frame(l); 226 227 /* 228 * The trampoline code hands us the context. 229 * It is unsafe to keep track of it ourselves, in the event that a 230 * program jumps out of a signal handler. 231 */ 232 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 233 if (copyin((caddr_t)sfp, &frame, sizeof(*sfp)) != 0) 234 return (EFAULT); 235 236 /* 237 * Make sure the processor mode has not been tampered with and 238 * interrupts have not been disabled. 239 */ 240#ifdef __PROG32 241 if ((frame.sf_sc.sc_cpsr & PSR_MODE) != PSR_USR32_MODE || 242 (frame.sf_sc.sc_cpsr & (I32_bit | F32_bit)) != 0) 243 return (EINVAL); 244#else /* __PROG26 */ 245 if ((frame.sf_sc.sc_pc & R15_MODE) != R15_MODE_USR || 246 (frame.sf_sc.sc_pc & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0) 247 return EINVAL; 248#endif 249 250 /* Restore register context. */ 251 tf = process_frame(l); 252 tf->tf_r0 = frame.sf_sc.sc_r0; 253 tf->tf_r1 = frame.sf_sc.sc_r1; 254 tf->tf_r2 = frame.sf_sc.sc_r2; 255 tf->tf_r3 = frame.sf_sc.sc_r3; 256 tf->tf_r4 = frame.sf_sc.sc_r4; 257 tf->tf_r5 = frame.sf_sc.sc_r5; 258 tf->tf_r6 = frame.sf_sc.sc_r6; 259 tf->tf_r7 = frame.sf_sc.sc_r7; 260 tf->tf_r8 = frame.sf_sc.sc_r8; 261 tf->tf_r9 = frame.sf_sc.sc_r9; 262 tf->tf_r10 = frame.sf_sc.sc_r10; 263 tf->tf_r11 = frame.sf_sc.sc_r11; 264 tf->tf_r12 = frame.sf_sc.sc_r12; 265 tf->tf_usr_sp = frame.sf_sc.sc_sp; 266 tf->tf_usr_lr = frame.sf_sc.sc_lr; 267 tf->tf_pc = frame.sf_sc.sc_pc; 268 tf->tf_spsr = frame.sf_sc.sc_cpsr; 269 270 /* Restore signal stack. */ 271 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 272 273 /* Restore signal mask. */ 274 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 275 frame.sf_extramask); 276 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 277 278 return (EJUSTRETURN); 279} 280 281/* 282 * major device numbers remapping 283 */ 284dev_t 285linux_fakedev(dev, raw) 286 dev_t dev; 287 int raw; 288{ 289 /* XXX write me */ 290 return dev; 291} 292 293/* 294 * We come here in a last attempt to satisfy a Linux ioctl() call 295 */ 296int 297linux_machdepioctl(p, v, retval) 298 struct proc *p; 299 void *v; 300 register_t *retval; 301{ 302 struct linux_sys_ioctl_args /* { 303 syscallarg(int) fd; 304 syscallarg(u_long) com; 305 syscallarg(caddr_t) data; 306 } */ *uap = v; 307 struct sys_ioctl_args bia; 308 u_long com; 309 310 SCARG(&bia, fd) = SCARG(uap, fd); 311 SCARG(&bia, data) = SCARG(uap, data); 312 com = SCARG(uap, com); 313 314 switch (com) { 315 default: 316 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 317 return EINVAL; 318 } 319 SCARG(&bia, com) = com; 320 /* XXX NJWLWP */ 321 return sys_ioctl(curlwp, &bia, retval); 322} 323