linux_machdep.c revision 1.4
1 /* $NetBSD: linux_machdep.c,v 1.4 2002/02/15 16:47:59 christos 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 1.4 2002/02/15 16:47:59 christos 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/map.h> 48 #include <sys/proc.h> 49 #include <sys/user.h> 50 #include <sys/buf.h> 51 #include <sys/reboot.h> 52 #include <sys/conf.h> 53 #include <sys/exec.h> 54 #include <sys/file.h> 55 #include <sys/callout.h> 56 #include <sys/malloc.h> 57 #include <sys/mbuf.h> 58 #include <sys/msgbuf.h> 59 #include <sys/mount.h> 60 #include <sys/vnode.h> 61 #include <sys/device.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 79 void 80 linux_setregs(p, epp, stack) 81 struct proc *p; 82 struct exec_package *epp; 83 u_long stack; 84 { 85 /* struct pcb *pcb = &p->p_addr->u_pcb; */ 86 87 setregs(p, epp, stack); 88 } 89 90 static __inline struct trapframe * 91 process_frame(struct proc *p) 92 { 93 94 return p->p_addr->u_pcb.pcb_tf; 95 } 96 97 void 98 linux_sendsig(catcher, sig, mask, code) 99 sig_t catcher; 100 int sig; 101 sigset_t *mask; 102 u_long code; 103 { 104 struct proc *p = curproc; 105 struct trapframe *tf; 106 struct linux_sigframe *fp, frame; 107 int onstack; 108 109 tf = process_frame(p); 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(mask, &frame.sf_sc.sc_mask, 155 frame.sf_extramask); 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(p, SIGILL); 174 /* NOTREACHED */ 175 } 176 /* 177 * Build context to run handler in. 178 */ 179 tf->tf_r0 = native_to_linux_sig[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 * System call to cleanup state after a signal 193 * has been taken. Reset signal mask and 194 * stack state from context left by sendsig (above). 195 * Return to previous pc and psl as specified by 196 * context left by sendsig. Check carefully to 197 * make sure that the user has not modified the 198 * psl to gain improper privileges or to cause 199 * a machine fault. 200 */ 201 int 202 linux_sys_rt_sigreturn(p, v, retval) 203 struct proc *p; 204 void *v; 205 register_t *retval; 206 { 207 /* XXX XAX write me */ 208 return(ENOSYS); 209 } 210 211 int 212 linux_sys_sigreturn(p, v, retval) 213 struct proc *p; 214 void *v; 215 register_t *retval; 216 { 217 struct linux_sigframe *sfp, frame; 218 struct trapframe *tf; 219 sigset_t mask; 220 221 tf = process_frame(p); 222 223 /* 224 * The trampoline code hands us the context. 225 * It is unsafe to keep track of it ourselves, in the event that a 226 * program jumps out of a signal handler. 227 */ 228 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 229 if (copyin((caddr_t)sfp, &frame, sizeof(*sfp)) != 0) 230 return (EFAULT); 231 232 /* 233 * Make sure the processor mode has not been tampered with and 234 * interrupts have not been disabled. 235 */ 236 #ifdef __PROG32 237 if ((frame.sf_sc.sc_cpsr & PSR_MODE) != PSR_USR32_MODE || 238 (frame.sf_sc.sc_cpsr & (I32_bit | F32_bit)) != 0) 239 return (EINVAL); 240 #else /* __PROG26 */ 241 if ((frame.sf_sc.sc_pc & R15_MODE) != R15_MODE_USR || 242 (frame.sf_sc.sc_pc & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0) 243 return EINVAL; 244 #endif 245 246 /* Restore register context. */ 247 tf = process_frame(p); 248 tf->tf_r0 = frame.sf_sc.sc_r0; 249 tf->tf_r1 = frame.sf_sc.sc_r1; 250 tf->tf_r2 = frame.sf_sc.sc_r2; 251 tf->tf_r3 = frame.sf_sc.sc_r3; 252 tf->tf_r4 = frame.sf_sc.sc_r4; 253 tf->tf_r5 = frame.sf_sc.sc_r5; 254 tf->tf_r6 = frame.sf_sc.sc_r6; 255 tf->tf_r7 = frame.sf_sc.sc_r7; 256 tf->tf_r8 = frame.sf_sc.sc_r8; 257 tf->tf_r9 = frame.sf_sc.sc_r9; 258 tf->tf_r10 = frame.sf_sc.sc_r10; 259 tf->tf_r11 = frame.sf_sc.sc_r11; 260 tf->tf_r12 = frame.sf_sc.sc_r12; 261 tf->tf_usr_sp = frame.sf_sc.sc_sp; 262 tf->tf_usr_lr = frame.sf_sc.sc_lr; 263 tf->tf_pc = frame.sf_sc.sc_pc; 264 tf->tf_spsr = frame.sf_sc.sc_cpsr; 265 266 /* Restore signal stack. */ 267 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 268 269 /* Restore signal mask. */ 270 linux_old_extra_to_native_sigset(&frame.sf_sc.sc_mask, 271 frame.sf_extramask, &mask); 272 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 273 274 return (EJUSTRETURN); 275 } 276 277 /* 278 * major device numbers remapping 279 */ 280 dev_t 281 linux_fakedev(dev, raw) 282 dev_t dev; 283 int raw; 284 { 285 /* XXX write me */ 286 return dev; 287 } 288 289 /* 290 * We come here in a last attempt to satisfy a Linux ioctl() call 291 */ 292 int 293 linux_machdepioctl(p, v, retval) 294 struct proc *p; 295 void *v; 296 register_t *retval; 297 { 298 struct linux_sys_ioctl_args /* { 299 syscallarg(int) fd; 300 syscallarg(u_long) com; 301 syscallarg(caddr_t) data; 302 } */ *uap = v; 303 struct sys_ioctl_args bia; 304 u_long com; 305 306 SCARG(&bia, fd) = SCARG(uap, fd); 307 SCARG(&bia, data) = SCARG(uap, data); 308 com = SCARG(uap, com); 309 310 switch (com) { 311 default: 312 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 313 return EINVAL; 314 } 315 SCARG(&bia, com) = com; 316 return sys_ioctl(p, &bia, retval); 317 } 318
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