1 /* $NetBSD: linux_machdep.c,v 1.16 2002/09/25 22:21:35 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 2000, 2001 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 and Emmanuel Dreyfus. 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/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.16 2002/09/25 22:21:35 thorpej Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/signalvar.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/user.h> 48 #include <sys/buf.h> 49 #include <sys/reboot.h> 50 #include <sys/conf.h> 51 #include <sys/exec.h> 52 #include <sys/file.h> 53 #include <sys/callout.h> 54 #include <sys/malloc.h> 55 #include <sys/mbuf.h> 56 #include <sys/msgbuf.h> 57 #include <sys/mount.h> 58 #include <sys/vnode.h> 59 #include <sys/device.h> 60 #include <sys/syscallargs.h> 61 #include <sys/filedesc.h> 62 #include <sys/exec_elf.h> 63 #include <sys/disklabel.h> 64 #include <sys/ioctl.h> 65 #include <sys/sysctl.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 #include <machine/cpu.h> 79 #include <machine/psl.h> 80 #include <machine/reg.h> 81 #include <machine/regnum.h> 82 #include <machine/vmparam.h> 83 #include <machine/locore.h> 84 85 #include <mips/cache.h> 86 87 /* 88 * To see whether wscons is configured (for virtual console ioctl calls). 89 */ 90 #if defined(_KERNEL_OPT) 91 #include "wsdisplay.h" 92 #endif 93 #if (NWSDISPLAY > 0) 94 #include <dev/wscons/wsconsio.h> 95 #include <dev/wscons/wsdisplay_usl_io.h> 96 #endif 97 98 /* 99 * Set set up registers on exec. 100 * XXX not used at the moment since in sys/kern/exec_conf, LINUX_COMPAT 101 * entry uses NetBSD's native setregs instead of linux_setregs 102 */ 103 void 104 linux_setregs(p, pack, stack) 105 struct proc *p; 106 struct exec_package *pack; 107 u_long stack; 108 { 109 setregs(p, pack, stack); 110 return; 111 } 112 113 /* 114 * Send an interrupt to process. 115 * 116 * Adapted from sys/arch/mips/mips/mips_machdep.c 117 * 118 * XXX Does not work well yet with RT signals 119 * 120 */ 121 122 void 123 linux_sendsig(sig, mask, code) /* XXX Check me */ 124 int sig; 125 sigset_t *mask; 126 u_long code; 127 { 128 struct proc *p = curproc; 129 struct linux_sigframe *fp; 130 struct frame *f; 131 int i,onstack; 132 sig_t catcher = SIGACTION(p, sig).sa_handler; 133 struct linux_sigframe sf; 134 135 #ifdef DEBUG_LINUX 136 printf("linux_sendsig()\n"); 137 #endif /* DEBUG_LINUX */ 138 f = (struct frame *)p->p_md.md_regs; 139 140 /* 141 * Do we need to jump onto the signal stack? 142 */ 143 onstack = 144 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 145 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 146 147 /* 148 * Signal stack is broken (see at the end of linux_sigreturn), so we do 149 * not use it yet. XXX fix this. 150 */ 151 onstack=0; 152 153 /* 154 * Allocate space for the signal handler context. 155 */ 156 if (onstack) 157 fp = (struct linux_sigframe *) 158 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp 159 + p->p_sigctx.ps_sigstk.ss_size); 160 else 161 /* cast for _MIPS_BSD_API == _MIPS_BSD_API_LP32_64CLEAN case */ 162 fp = (struct linux_sigframe *)(u_int32_t)f->f_regs[SP]; 163 164 /* 165 * Build stack frame for signal trampoline. 166 */ 167 memset(&sf, 0, sizeof sf); 168 169 /* 170 * This is the signal trampoline used by Linux, we don't use it, 171 * but we set it up in case an application expects it to be there 172 */ 173 sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */ 174 sf.lsf_code[1] = 0x0000000c; /* syscall */ 175 176 native_to_linux_sigset(&sf.lsf_mask, mask); 177 for (i=0; i<32; i++) { 178 sf.lsf_sc.lsc_regs[i] = f->f_regs[i]; 179 } 180 sf.lsf_sc.lsc_mdhi = f->f_regs[MULHI]; 181 sf.lsf_sc.lsc_mdlo = f->f_regs[MULLO]; 182 sf.lsf_sc.lsc_pc = f->f_regs[PC]; 183 sf.lsf_sc.lsc_status = f->f_regs[SR]; 184 sf.lsf_sc.lsc_cause = f->f_regs[CAUSE]; 185 sf.lsf_sc.lsc_badvaddr = f->f_regs[BADVADDR]; 186 187 /* 188 * Save signal stack. XXX broken 189 */ 190 /* kregs.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; */ 191 192 /* 193 * Install the sigframe onto the stack 194 */ 195 fp -= sizeof(struct linux_sigframe); 196 if (copyout(&sf, fp, sizeof(sf)) != 0) { 197 /* 198 * Process has trashed its stack; give it an illegal 199 * instruction to halt it in its tracks. 200 */ 201 #ifdef DEBUG_LINUX 202 printf("linux_sendsig: stack trashed\n"); 203 #endif /* DEBUG_LINUX */ 204 sigexit(p, SIGILL); 205 /* NOTREACHED */ 206 } 207 208 /* Set up the registers to return to sigcode. */ 209 f->f_regs[A0] = native_to_linux_signo[sig]; 210 f->f_regs[A1] = 0; 211 f->f_regs[A2] = (unsigned long)&fp->lsf_sc; 212 213 #ifdef DEBUG_LINUX 214 printf("sigcontext is at %p\n", &fp->lsf_sc); 215 #endif /* DEBUG_LINUX */ 216 217 f->f_regs[SP] = (unsigned long)fp; 218 /* Signal trampoline code is at base of user stack. */ 219 f->f_regs[RA] = (unsigned long)p->p_sigctx.ps_sigcode; 220 f->f_regs[T9] = (unsigned long)catcher; 221 f->f_regs[PC] = (unsigned long)catcher; 222 223 /* Remember that we're now on the signal stack. */ 224 if (onstack) 225 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 226 227 return; 228 } 229 230 /* 231 * System call to cleanup state after a signal 232 * has been taken. Reset signal mask and 233 * stack state from context left by sendsig (above). 234 */ 235 int 236 linux_sys_sigreturn(p, v, retval) 237 struct proc *p; 238 void *v; 239 register_t *retval; 240 { 241 struct linux_sys_sigreturn_args /* { 242 syscallarg(struct linux_sigframe *) sf; 243 } */ *uap = v; 244 struct linux_sigframe *sf, ksf; 245 struct frame *f; 246 sigset_t mask; 247 int i, error; 248 249 #ifdef DEBUG_LINUX 250 printf("linux_sys_sigreturn()\n"); 251 #endif /* DEBUG_LINUX */ 252 253 /* 254 * The trampoline code hands us the context. 255 * It is unsafe to keep track of it ourselves, in the event that a 256 * program jumps out of a signal handler. 257 */ 258 sf = SCARG(uap, sf); 259 260 if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0) 261 return (error); 262 263 /* Restore the register context. */ 264 f = (struct frame *)p->p_md.md_regs; 265 for (i=0; i<32; i++) 266 f->f_regs[i] = ksf.lsf_sc.lsc_regs[i]; 267 f->f_regs[MULLO] = ksf.lsf_sc.lsc_mdlo; 268 f->f_regs[MULHI] = ksf.lsf_sc.lsc_mdhi; 269 f->f_regs[PC] = ksf.lsf_sc.lsc_pc; 270 f->f_regs[BADVADDR] = ksf.lsf_sc.lsc_badvaddr; 271 f->f_regs[CAUSE] = ksf.lsf_sc.lsc_cause; 272 273 /* Restore signal stack. */ 274 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 275 276 /* Restore signal mask. */ 277 linux_to_native_sigset(&mask, (linux_sigset_t *)&ksf.lsf_mask); 278 (void)sigprocmask1(p, SIG_SETMASK, &mask, 0); 279 280 return (EJUSTRETURN); 281 } 282 283 284 int 285 linux_sys_rt_sigreturn(p, v, retval) 286 struct proc *p; 287 void *v; 288 register_t *retval; 289 { 290 return 0; 291 } 292 293 294 #if 0 295 int 296 linux_sys_modify_ldt(p, v, retval) 297 struct proc *p; 298 void *v; 299 register_t *retval; 300 { 301 /* 302 * This syscall is not implemented in Linux/Mips: we should not 303 * be here 304 */ 305 #ifdef DEBUG_LINUX 306 printf("linux_sys_modify_ldt: should not be here.\n"); 307 #endif /* DEBUG_LINUX */ 308 return 0; 309 } 310 #endif 311 312 /* 313 * major device numbers remapping 314 */ 315 dev_t 316 linux_fakedev(dev, raw) 317 dev_t dev; 318 int raw; 319 { 320 /* XXX write me */ 321 return dev; 322 } 323 324 /* 325 * We come here in a last attempt to satisfy a Linux ioctl() call 326 */ 327 int 328 linux_machdepioctl(p, v, retval) 329 struct proc *p; 330 void *v; 331 register_t *retval; 332 { 333 return 0; 334 } 335 336 /* 337 * See above. If a root process tries to set access to an I/O port, 338 * just let it have the whole range. 339 */ 340 int 341 linux_sys_ioperm(p, v, retval) 342 struct proc *p; 343 void *v; 344 register_t *retval; 345 { 346 /* 347 * This syscall is not implemented in Linux/Mips: we should not be here 348 */ 349 #ifdef DEBUG_LINUX 350 printf("linux_sys_ioperm: should not be here.\n"); 351 #endif /* DEBUG_LINUX */ 352 return 0; 353 } 354 355 /* 356 * wrapper linux_sys_new_uname() -> linux_sys_uname() 357 */ 358 int 359 linux_sys_new_uname(p, v, retval) 360 struct proc *p; 361 void *v; 362 register_t *retval; 363 { 364 /* 365 * Use this if you want to try Linux emulation with a glibc-2.2 366 * or higher. Note that signals will not work 367 */ 368 #if 0 369 struct linux_sys_uname_args /* { 370 syscallarg(struct linux_utsname *) up; 371 } */ *uap = v; 372 struct linux_utsname luts; 373 374 strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 375 strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 376 strncpy(luts.l_release, "2.4.0", sizeof(luts.l_release)); 377 strncpy(luts.l_version, linux_version, sizeof(luts.l_version)); 378 strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); 379 strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 380 381 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 382 #else 383 return linux_sys_uname(p, v, retval); 384 #endif 385 } 386 387 /* 388 * In Linux, cacheflush is icurrently implemented 389 * as a whole cache flush (arguments are ignored) 390 * we emulate this broken beahior. 391 */ 392 int 393 linux_sys_cacheflush(p, v, retval) 394 struct proc *p; 395 void *v; 396 register_t *retval; 397 { 398 mips_icache_sync_all(); 399 mips_dcache_wbinv_all(); 400 return 0; 401 } 402 403 /* 404 * This system call is depecated in Linux, but 405 * some binaries and some libraries use it. 406 */ 407 int 408 linux_sys_sysmips(p, v, retval) 409 struct proc *p; 410 void *v; 411 register_t *retval; 412 { 413 struct linux_sys_sysmips_args { 414 syscallarg(int) cmd; 415 syscallarg(int) arg1; 416 syscallarg(int) arg2; 417 syscallarg(int) arg3; 418 } *uap = v; 419 int error; 420 421 switch (SCARG(uap, cmd)) { 422 case LINUX_SETNAME: { 423 char nodename [LINUX___NEW_UTS_LEN + 1]; 424 int name; 425 size_t len; 426 427 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 428 return error; 429 if ((error = copyinstr((char *)SCARG(uap, arg1), nodename, 430 LINUX___NEW_UTS_LEN, &len)) != 0) 431 return error; 432 433 name = KERN_HOSTNAME; 434 return (kern_sysctl(&name, 1, 0, 0, nodename, len, p)); 435 436 break; 437 } 438 case LINUX_MIPS_ATOMIC_SET: { 439 void *addr; 440 int s; 441 442 addr = (void *)SCARG(uap, arg1); 443 444 if ((uvm_useracc((caddr_t)addr, sizeof(int), 445 B_READ | B_WRITE)) != 1) 446 return EFAULT; 447 448 s = splhigh(); 449 /* 450 * No error testing here. This is bad, but Linux does 451 * it like this. The source aknowledge "This is broken" 452 * in a comment... 453 */ 454 *retval = (register_t)fubyte(addr); 455 error = subyte(addr, SCARG(uap, arg2)); 456 splx(s); 457 458 return 0; 459 break; 460 } 461 case LINUX_MIPS_FIXADE: /* XXX not implemented */ 462 break; 463 case LINUX_FLUSH_CACHE: 464 mips_icache_sync_all(); 465 mips_dcache_wbinv_all(); 466 break; 467 case LINUX_MIPS_RDNVRAM: 468 return EIO; 469 break; 470 default: 471 return EINVAL; 472 break; 473 } 474 #ifdef DEBUG_LINUX 475 printf("linux_sys_sysmips(): unimplemented command %d\n", 476 SCARG(uap,cmd)); 477 #endif /* DEBUG_LINUX */ 478 return 0; 479 } 480